Articles de revues : « Ejector Chiller »

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Radchenko, Andrii, Dariusz Mikielewicz, Mykola Radchenko, Serhiy Forduy, Oleksandr Rizun et Viktor Khaldobin. « Innovative combined in-cycle trigeneration technologies for food industries ». E3S Web of Conferences 323 (2021) : 00029. http://dx.doi.org/10.1051/e3sconf/202132300029.

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The majority of integrated energy systems (IES) for combined electricity, heat and refrigeration generation, or trigeneration, are based on gas engines. The fuel efficiency of gas engines are strictly influenced by intake air temperatures. Practically in all IES the absorption lithium-bromide chillers (ACh) are applied for conversing the heat removed from the engine into refrigeration in the form of chilled water. The peculiarity of trigeneration in food industries is the use of chilled water of about 12°C for technological needs instead of 7°C as typical for ACh. This leads to a considerable great potential of engine intake air deeper cooling not realized by ACh, that can be used by ejector chiller (ECh) as the low temperature stage of two-stage absorption-ejector chiller (AECh) to provide engine cyclic air deep cooling and enhancing engine fuel efficiency. To evaluate the effect of gas engine cyclic air cooling the data on fuel consumption and power output of gas engine JMS 420 GS-N.L were analyzed.

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Viscito, Luca, Gianluca Lillo, Giovanni Napoli et Alfonso William Mauro. « Waste Heat Driven Multi-Ejector Cooling Systems : Optimization of Design at Partial Load ; Seasonal Performance and Cost Evaluation ». Energies 14, n^o 18 (9 septembre 2021) : 5663. http://dx.doi.org/10.3390/en14185663.

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In this paper, a seasonal performance analysis of a hybrid ejector cooling system is carried-out, by considering a multi-ejector pack as expansion device. A 20 kW ejector-based chiller was sized to obtain the optimal tradeoff between performance and investment costs. The seasonal performance of the proposed solution was then evaluated through a dynamic simulation able to obtain the performance of the designed chiller with variable ambient temperatures for three different reference climates. The optimized multi-ejector system required three or four ejectors for any reference climate and was able to enhance the system performance at partial load, with a significant increase (up to 107%) of the seasonal energy efficiency ratio. The proposed system was then compared to conventional cooling technologies supplied by electric energy (electrical chillers EHP) or low-grade heat sources (absorption chillers AHP) by considering the total costs for a lifetime of 20 years and electric energy-specific costs for domestic applications from 0.10 to 0.50 €/kWhel. The optimized multi-ejector cooling system presented a significant convenience with respect to both conventional technologies. For warmer climates and with high electricity costs, the minimum lifetime for the multi-ejector system to achieve the economic break-even point could be as low as 1.9 years.

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Радченко, Андрій Миколайович, Микола Іванович Радченко, Богдан Сергійович Портной, Сергій Анатолійович Кантор et Олександр Ігорович Прядко. « ВИКОРИСТАННЯ НАДЛИШКУ ХОЛОДОПРОДУКТИВНОСТІ ХОЛОДИЛЬНИХ МАШИН ПРИ ОХОЛОДЖЕННІ ПОВІТРЯ НА ВХОДІ ГТУ ». Aerospace technic and technology, n^o 5 (29 août 2020) : 47–52. http://dx.doi.org/10.32620/aktt.2020.5.06.

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The processes of the gas turbine inlet air cooling by exhaust heat conversion chillers, which utilizing the gas turbine exhaust gas heat, converting it into cold were analyzed. The use of two-stage air cooling has been investigated: to a temperature of 15°C – in an absorption lithium-bromide chiller and below to a temperature of 10°C – in an ejector chiller as stages of a two-stage absorption-ejector chiller. To simulate air cooling processes, the program "Guentner Product Calculator", one of the leading manufacturers of heat exchangers "Guentner", was used. The possibility of using the accumulated excess refrigeration capacity of a combined absorption-ejector chiller, which is formed at reduced current heat loads on air coolers at the gas turbine inlet, to cover the refrigeration capacity deficit arising at increased heat loads due to high ambient air temperatures has been investigated. The refrigeration capacity required to the gas turbine inlet air cooling was compared to an excess refrigeration capacity which excess of the current heat load. The considered air cooling system provides pre-cooling of air at the gas turbine inlet by using the excess refrigeration capacity of the absorption-ejector chiller, accumulated in the cold accumulator, to provide the required refrigeration capacity of the air pre-cooling booster stage. The simulation results proved the expediency of the gas turbine inlet air cooling using the accumulated excess refrigeration capacity of the combined absorption-ejector chiller. The proposed solution reduces by about 50% the design refrigeration capacity and, accordingly, the cost of the installed absorption lithium-bromide chiller, which acts as a high-temperature stage for cooling the ambient air at the gas turbine inlet.

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Радченко, Роман Миколайович, Максим Андрійович Пирисунько, Нiн Чен et Баочен Хан. « ОХОЛОДЖЕННЯ ПОВІТРЯ НА ВХОДІ МАЛООБЕРТОВОГО ДВИГУНА ЕЖЕКТОРНОЮ ХОЛОДИЛЬНОЮ МАШИНОЮ ПРИ ЕКСПЛУАТАЦІЇ СУДНА В ТРОПІЧНИХ УМОВАХ ». Aerospace technic and technology, n^o 1 (25 janvier 2020) : 17–21. http://dx.doi.org/10.32620/aktt.2020.1.03.

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The efficiency of air cooling at the inlet of the main low-speed engine turbocharger of a transport vessel during operation in tropical climatic conditions on the Shanghai-Singapore-Shanghai route was analyzed. A feature of the tropical climate is the high relative humidity, respectively, moisture content at its simultaneously high temperatures. The cooling of the air at the inlet of a low-speed engine with an ejector chiller by transforming the waste heat of exhaust gases into cold was studied. The ejector chiller is used as the most simple and reliable in operation. However, the efficiency of the transformation of heat into cold by ejector chillers is low - low thermal coefficients.A design solution of the system for cooling air at the inlet of the ship's main engine using the heat of the exhaust gases by an ejector chiller is proposed and analyzed. The effect of using the heat of the exhaust gases to cool the air at the engine inlet is analyzed taking into account the variable climatic conditions during the voyage of the vessel. It is shown that because of the insufficiently high efficiency of transforming the waste heat of the exhaust gases by an ejector chiller (low thermal coefficients), the obtained cooling capacity is not sufficient for cooling the air at the inlet of the turbocompressor during operation of a marine engine in tropical climatic conditions. Therefore, the possibility of use in the ejector chiller of additional heat of charge air, which is removed by cooling water, is also considered. It is shown that the use of the heat of exhaust gases and charge air for cooling the air at the engine inlet in an ejector chiller makes it possible to double decrease the air temperature at the inlet of the main engine by 20-30 °C when the vessel operates in tropical climatic conditions on a voyage lines Shanghai-Singapore-Shanghai. This, in turn, provides an almost twice fuel consumption reduction in compared with its reduction in the case when the ejector chiller uses only the heat of the exhaust gases.

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Radchenko, Mykola, Andrii Radchenko, Dariusz Mikielewicz, Krzysztof Kosowski, Serhiy Kantor et Ivan Kalinichenko. « Gas turbine intake air hybrid cooling systems and their rational designing ». E3S Web of Conferences 323 (2021) : 00030. http://dx.doi.org/10.1051/e3sconf/202132300030.

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The general trend to improve the fuel efficiency of gas turbines (GT) at increased ambient temperatures is turbine intake air cooling (TIAC) by exhaust heat recovery chillers The high efficiency absorption lithium-bromide chillers (ACh) of a simple cycle are the most widely used, but they are not able to cool intake air lower than 15°C because of a chilled water temperature of about 7°C. A two-stage hybrid absorption-ejector chillers (AECh) were developed with ejector chiller as a low temperature stage to provide deep air cooling to 10°C and lower. A novel trend in TIAC by two-stage air cooling in chillers of hybrid type has been proposed to provide about 50% higher annual fuel saving in temperate climatic conditions as compared with ACh cooling. The advanced methodology to design and rational distribute the cooling capacity of TIAC systems that provides a closed to maximum annual fuel reduction without oversizing was developed.

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Radchenko, Andrii, Mykola Radchenko, Dariusz Mikielewicz, Anatoliy Pavlenko, Roman Radchenko et Serhiy Forduy. « Energy Saving in Trigeneration Plant for Food Industries ». Energies 15, n^o 3 (4 février 2022) : 1163. http://dx.doi.org/10.3390/en15031163.

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The trigeneration plants for combined cooling, heating, and electricity supply, or integrated energy systems (IES), are mostly based on gas reciprocating engines. The fuel efficiency of gas reciprocating engines depends essentially on air intake temperatures. The transformation of the heat removed from the combustion engines into refrigeration is generally conducted by absorption lithium-bromide chillers (ACh). The peculiarity of refrigeration generation in food technologies is the use of chilled water of about 12 °C instead of 7 °C as the most typical for ACh. This leads to a considerable cooling potential not realized by ACh that could be used for cooling the engine intake air. A refrigerant ejector chiller (ECh) is the simplest in design, cheap, and can be applied as the low-temperature stage of a two-stage absorption-ejector chiller (AECh) to provide engine intake air cooling and increase engine fuel efficiency as result. The monitoring data on gas engine fuel consumption and power were analyzed in order to evaluate the effect of gas engine cyclic air cooling.

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Радченко, Микола Іванович, Дмитро Вікторович Коновалов, Чжан Цян, Лю Шаоцзюнь, Луо Зевей et Джі Ран. « ОХОЛОДЖЕННЯ НАДДУВНОГО ПОВІТРЯ ГОЛОВНОГО СУДНОВОГО ДВИГУНА ЕЖЕКТОРНОЮ ХОЛОДИЛЬНОЮ МАШИНОЮ В ЕКВАТОРІАЛЬНИХ ШИРОТАХ ». Aerospace technic and technology, n^o 2 (27 avril 2020) : 24–29. http://dx.doi.org/10.32620/aktt.2020.2.04.

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The efficiency of cooling the scavenge air of the main low-speed engine of the transport vessel during operation in the equatorial tropical latitudes is analyzed. The peculiarity of the tropical climate is the high relative humidity of the air at the same time its high temperatures and temperatures of seawater. The cooling of the s scavenge air with a refrigerant ejector chiller was investigated by transforming the scavenge air heat into the cold. With this, the potentially possible minimum temperature of the cooled air was determined considering the boiling temperature of the refrigerant and the temperature differences in the heat exchangers of the intermediate water cooling circuit. Refrigerant ejector chiller is used as the most simple and reliable in design. However, the efficiency of converting the heat to cold by ejector chillers is low: their coefficients of performance are approximately 0.3. Circuit-design solution of three-stage cooling system of scavenging air of ship's main engine - in high-temperature (cogeneration) stage using the extracted heat of scavenging air to get cold with ejector chiller and traditional stage for cooling scavenge air by seawater and low-temperature cooling stage by ejector chiller. The effect of deeper cooling of the scavenge air was determined in comparison with the cooling of the scavenge air with seawater, taking into account the changing climatic conditions during the route of the vessel. It is shown that because of the insufficiently high efficiency of transformation of the scavenge air heat by the ejector chiller (low coefficients of performance) the obtained cooling capacity is not sufficient to cool the scavenge air to a potentially possible minimum temperature of 22 °C when operating the ship engine in tropical climates. However, the heat deficit is relatively small and can be covered by the use of additional exhaust gas heat.

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Радченко, Микола Іванович, Євген Іванович Трушляков, Богдан Сергійович Портной, Сергій Анатолійович Кантор et Ян Зонмін. « ПОРІВНЯННЯ ХАРАКТЕРИСТИК ГЛИБОКОГО ОХОЛОДЖЕННЯ ПОВІТРЯ НА ВХОДІ ГТУ ДЛЯ РІЗНОГО ТИПУ КЛІМАТУ ». Aerospace technic and technology, n^o 1 (25 janvier 2020) : 12–16. http://dx.doi.org/10.32620/aktt.2020.1.02.

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The efficiency of deep air cooling at the inlet of gas turbine units has been investigated for changed climatic conditions of operation during the month. For air cooling, the use of waste heat recovery chiller has been considered, which transform the heat of exhaust gases of gas turbine units into the cold. The efficiency of air cooling at the inlet of gas turbine units to different temperatures has been analysed: to 15°C – an absorption lithium-bromide chiller, which is used as the first pre-cooling stage of ambient air and down to 10°C – a combined absorption-ejector chiller, with ejector refrigerant chiller as the second stage of air cooling.The air cooling efficiency is estimated for different climatic conditions: a temperate climate on the example of Odessa (Ukraine) and a subtropical climate for Guangzhou (China). The subtropical climate peculiarity of Guangzhou is the high relative humidity of the air, respectively, and its moisture contents at the same time its high temperatures. As an indicator, when evaluating the efficiency of air cooling at the inlet of gas turbine units to 15°C in an absorption lithium-bromide chiller and deep cooling of air to 10°C in a combined absorption-ejector chiller, the specific fuel consumption reduced has been used. In this case, the needs for specific production of refrigeration capacity and specific capacity of cooling towers for cooling waste heat recovery chillers when cooling air to different temperatures are compared. It is shown that, through extremely different thermal and humidity parameters of ambient air, its cooling at the inlet of gas turbine units to 10ºС for the climatic conditions of Ukraine provides the current decrease in specific fuel consumption due to deeper cooling of the air at the inlet of the GTU in 1.6 ... 1.7 times compared with cooling to 15ºС, and for climatic conditions of the PRC - 1.4 ... 1.45 times. However, it should be noted that a deeper cooling of the air at the inlet of the gas turbine unit to a temperature of 10°C in a combined absorption-ejector chiller compared to its traditional cooling to 15°C in an absorption bromine-lithium chiller requires an increase in the required specific amount of cold by 1.7 ... 2, 0 times and the required specific capacity of cooling towers for cooling chillers by 2.6 ... 3.0 times for the climatic conditions of Ukraine, while for China - 1.25 ... 1.3 and 1.5 ... 1.6 times, respectively.

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Yang, Zongming, Mykola Radchenko, Andrii Radchenko, Dariusz Mikielewicz et Roman Radchenko. « Gas Turbine Intake Air Hybrid Cooling Systems and a New Approach to Their Rational Designing ». Energies 15, n^o 4 (17 février 2022) : 1474. http://dx.doi.org/10.3390/en15041474.

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Gas turbine intake air cooling (TIAC) by exhaust gas heat recovery chillers is a general trend to improve turbine fuel efficiency at increased ambient temperatures. The high efficiency absorption lithium–bromide chillers of a simple cycle are the most widely used, but they are unable to cool inlet air lower than 15 °C. A two-stage hybrid absorption–ejector chillers were developed with absorption chiller as a high temperature stage and ejector chiller as a low temperature stage to subcool air from 15 °C to 10 °C and lower. A novel trend in TIAC by two-stage air cooling in hybrid chillers has been substantiated to provide about 50% higher annual fuel saving in temperate climate as compared with absorption cooling. A new approach to reduce practically twice design cooling capacity of absorption chiller due to its rational distribution with accumulating excessive refrigeration energy at decreased thermal loads to cover the picked demands and advanced design methodology based on it was proposed. The method behind this is issued from comparing a behavior of the characteristic curves of refrigeration energy required for TIAC with its available values according to various design cooling capacities to cover daily fluctuation of thermal loads at reduced by 15 to 20% design cooling capacity and practically maximum annual fuel reduction.

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Радченко, Андрій Миколайович, Сергій Анатолійович Кантор, Богдан Сергійович Портной et Юрій Георгійович Щербак. « ОХОЛОДЖЕННЯ ПОВІТРЯ НА ВХОДІ ГТУ З ВИКОРИСТАННЯМ РЕЗЕРВУ ХОЛОДОПРОДУКТИВНОСТІ АБСОРБЦІЙНО-ЕЖЕКТОРНОЇ ХОЛОДИЛЬНОЇ МАШИНИ В БУСТЕРНОМУ ПОВІТРООХОЛОДЖУВАЧІ ». Aerospace technic and technology, n^o 2 (26 avril 2018) : 14–19. http://dx.doi.org/10.32620/aktt.2018.2.02.

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The processes of gas turbine unit two-stage intake air cooling by absorption lithium-bromide chiller as a high temperature cooling stage to the temperature of about 15 °C and by refrigerant ejector chiller as a low temperature cooling stage to the temperature of about 10 °C through utilizing the turbine exhaust gas waste heat for hour-by-hour changing ambient air temperatures and changeable heat loads on the air coolers as consequence during 10 days of July 2017 (10–12.07.2017) for climatic conditions of the south of Ukraine are analyzed. The computer programs of the firms-producers of heat exchangers were used for gas turbine unit inlet air cooling processes simulation.It is shown that at decreased heat loads on the air coolers an excessive refrigeration capacity of combined absorption-ejector chiller exceeding current heat loads is generated which can be used for covering increased heat loads on the air coolers and to reduce the refrigeration capacity of the absorption-ejector chiller. To solve this task the refrigeration capacity required for gas turbine unit inlet air cooling is compared with an excessive refrigeration capacity of the absorption-ejector chiller exceeding current heat loads summarized during 10 days.The system of gas turbine unit inlet air cooling with a booster stage of precooling air and a base two-stage cooling air to the temperature of about 10 °C by absorption-ejector chiller has been proposed. An excessive refrigeration capacity of the absorption-ejector chiller generated during decreased heat loads on the gas turbine unit inlet air coolers that is collected in the thermal accumulator is used for gas turbine unit inlet air precooling in a booster stage of air coolers during increased heat loads on the air coolers. The results of gas turbine unit inlet air cooling processes simulation proved the reduction of refrigeration capacity of the absorption-ejector chiller by about 50 % due to the use of a booster stage for precooling air at the expanse of an excessive absorption-ejector chiller refrigeration capacity served in the thermal accumulator. The conclusion has been made about the efficient use of a booster stage of gas turbine unit inlet air cooler for precooling air by using an excessive refrigeration potential of absorption-ejector chiller saved in the thermal accumulator

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Radchenko, Andrii M. « Gas turbine intake air cooling systems of combined type and their optimum designing ». Joupnal of New Technologies in Environmental Science 5, n^o 2 (30 juin 2020) : 3–24. http://dx.doi.org/10.30540/jntes-2020-2.1.

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Turbine intake air cooling (TIAC) by absorption lithium-bromide chillers (ACh) utilizing the exhaust heat is considered as the most effective fuel saving technology for temperate climatic conditions. But the cooling potential of TIAC systems based on ACh of a simple cycle is limited by a comparatively increased chilled water temperature of about 7°C excluding cooling intake air lower than 15°C. The application of a refrigerant as a coolant enables deeper cooling intake air to 10°C and lower. The application of two-stage hybrid absorption-ejector chillers (AECh) with a refrigerant ejector chiller (ECh) as a low temperature stage makes it possible to increase the annual fuel saving approximately twice in temperate climate due to deeper cooling air as compared with ACh. Furthermore, this effect can be achieved with the sizes of TIAC system reduced by about 20 % due to determining the rational refrigeration capacity of AECh providing practically maximum annual fuel saving increment and the use of the current excessive refrigeration capacities to cover peaked loads.

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Радченко, Андрей Николаевич, Анатолий Анатольевич Зубарев, Алексей Валерьевич Остапенко et Артем Викторович Грич. « ПОВЫШЕНИЕ ЭФФЕКТИВНОСТИ УТИЛИЗАЦИИ ТЕПЛОТЫ ГАЗОВОГО ДВИГАТЕЛЯ СТУПЕНЧАТОЙ ТРАНСФОРМАЦИЕЙ ». Aerospace technic and technology, n^o 6 (20 décembre 2018) : 39–43. http://dx.doi.org/10.32620/aktt.2018.6.06.

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It was carried out the analysis of the heat utilization efficiency of the cogeneration module of the gas reciprocating engine with the cold produced by an absorption Li-Br chiller in an autonomous electric, heat and cold supply unit. It was revealed the presence of 30% heat losses of the total heat removed from the cogeneration gas reciprocating module and is due to the inconsistency of the joint operation modes of the absorption Li-Br chiller and the gas reciprocating engine. This inconsistency is caused by the contradictory conditions of their effective operation according to the temperature of the return coolant at the outlet of the absorption Li-Br chiller and at the entrance to the engine cooling system. The thermal state of the gas reciprocating engine is ensured by maintaining the temperature of the return (cooled) coolant not more than 70 °C at the inlet. At the same time, during the transformation of the coolant heat into the cold in an absorption Li-Br chiller, the temperature reducing in the machine is no more than 10 ... 15 °С, i.e. up to 75 ... 80 °С, if the temperature of the heat coolant at the outlet of the cogeneration gas reciprocating module (at the inlet of the absorption Li-Br chiller) is 90 °С. Due to the conflicting requirements for efficient operation of the gas reciprocating engine and absorption Li-Br chiller for the coolant temperature to maintain the temperature of the return coolant at the engine inlet at a safe level of 70 °C, it is additionally cooled in the "emergency heat release" cooling tower. It was studied the stage transformation of heat into cold applying ejector and absorption Li-Br chiller, and the evaporator section of the ejector chiller’s generator was on the coolant line before the absorption Li-Br chiller and the economizer section of the generator was on the coolant line after it. It was determined the dependence of the units’ cooling capacity increase on the thermal coefficient of the ejector chiller and the possibility of the unit’s cooling capacity increase by 10 ... 15% applying stage transformation of heat

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Портной, Богдан Сергійович. « ВИБІР ТЕПЛОВОГО НАВАНТАЖЕННЯ АПАРАТІВ ОХОЛОДЖЕННЯ ПОВІТРЯ НА ВХОДІ ГТУ В РІЗНИХ КЛІМАТИЧНИХ УМОВАХ ». Aerospace technic and technology, n^o 4 (14 octobre 2018) : 49–52. http://dx.doi.org/10.32620/aktt.2018.4.06.

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It is proposed the definition of the installed (rational) refrigeration capacity of a waste heat-recovery absorption-ejector chiller that utilizes the heat of the exhaust gases of a gas turbine unite to cool the air at the inlet. Since the effect of air cooling, in particular in the form of a reduction in the specific fuel consumption, depends on its depth (the magnitude of the decrease in air temperature) and duration, it is proposed to determine it by the annual fuel economy. As an example of air cooling at the inlet of a gas turbine unit, the value of reducing specific fuel consumption due to cooling the air at the inlet to the temperature of 15 °C by an absorption lithium-bromide chiller and two-stage air cooling: to a temperature of 15 °C in an absorption lithium-bromide chiller and down to 10 °C – in a refrigerant ejector chiller as the stages of a two-stage absorption-ejector chiller, depending on the installed (design) refrigeration capacity is analyzed.It is shown that proceeding from the different rate of increment of the annual reduction in the specific fuel consumption due to the change in the thermal load in accordance with the current climatic conditions, it is necessary to choose such design heat load for the air cooling system (installed refrigeration capacity of the chillers), which ensures the achievement of the maximum or close to annual reduction in the specific fuel consumption at relatively high rates of its increment. In order to determine the installed refrigeration capacity, which ensures the maximum annual refrigeration capacity (annual production of cold), the dependence of the increment of annual fuel economy from the installed refrigeration capacity is analyzed. Based on the results of the investigation, it was proposed to determine the rational thermal load of the air cooling system (installed - the design refrigeration capacity of the chiller) in accordance with the changing climatic conditions of operation during the year, which provides a maximum annual reduction in the specific fuel consumption at relatively high rates of its increment

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Radchenko, A. M., Y. Zongming et B. S. Portnoi. « Analyzing the efficiency of moderate and deep cooling of air at the inlet of gas turbine in various climatic conditions ». Refrigeration Engineering and Technology 55, n^o 1 (10 février 2019) : 34–39. http://dx.doi.org/10.15673/ret.v55i1.1351.

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The efficiency of deep cooling air at the inlet of gas turbine unite to the temperature of 10 °С by waste heat recovery combined absorption-ejector chiller was analyzed in climatic conditions at Kharkov site, Ukraine, and Beijing site, China, and compared with the moderate cooling to the temperature of 15°C in traditional absorption lithium-bromide chiller. The refrigerant ejector chiller is chosen as the most simple and reliable in operation chiller. It was used as the low-temperature stage for subcooling the air precooled in absorption lithium-bromide chiller to the temperature about 15 °C. Both waste heat recovery absorption lithium-bromide chiller and ejector chiller use the heat of gas turbine unite exhaust gas to produce a cooling capacity. Air cooling at the inlet of gas turbine unite was investigated for varying climatic conditions during the year. The current values of temperature depression with cooling ambient air to different temperatures of 10 °C and 15 °C and corresponding cooling capacities required were calculated. The comparison of the effect due to gas turbine unite inlet air cooling was performed by annual fuel saving and power production growth. With this the current values of turbine power output increase and specific fuel consumption decrease due to cooling inlet air from current varying ambient temperatures to the temperatures of 10 °C and 15 °C were calculated. It was shown that annual fuel saving and power production growth have increased by 1,8 times for Kharkov (Ukraine) site climatic conditions and by 1,6 times for Beijing (China) site due to deep cooling air to the temperature of 10 °C by absorption-ejector chiller as compared with cooling inlet air to the temperature of 15 °C by absorption lithium-bromide chiller.

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Pollerberg, Clemens, Ahmed Hamza H. Ali et Christian Dötsch. « Solar driven steam jet ejector chiller ». Applied Thermal Engineering 29, n^o 5-6 (avril 2009) : 1245–52. http://dx.doi.org/10.1016/j.applthermaleng.2008.06.017.

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Radchenko, Andrii, Ionut-Cristian Scurtu, Mykola Radchenko, Serhiy Forduy et Anatoliy Zubarev. « Monitoring the efficiency of cooling air at the inlet of gas engine in integrated energy system ». Thermal Science, n^o 00 (2020) : 344. http://dx.doi.org/10.2298/tsci200711344r.

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The fuel efficiency of gas engines is effected by the temperature of intake air at the suction of turbocharger. The data on dependence of fuel consumption and engine electric power on the intake air temperature were monitored for Jenbacher gas engine JMS 420 GS-N.LC to evaluate its influence. A waste heat of engine is rejected for heating water to the temperature of about 90??. The heat received is used in absorption lithium-bromide chiller to produce a cold in the form of chilled water. A cooling capacity of absorption chiller firstly is spent for technological needs and then for feeding the central air conditioner for cooling the ambient air incoming the engine room, from where the air is sucked by the engine turbocharger. The monitoring data revealed the reserves to enhance the efficiency of traditional cooling system of intake air by absorption chiller through deeper cooling. This concept can be realized in two ways: by addition cooling a chilled water from absorption chiller to about 5-7?? for feeding engine intake air cooler or by two-stage cooling with precooling ambient air by chilled water from ACh in the first stage and subsequent deep cooling air to the temperatures 7-10?? in the second stage of intake air cooler by using a refrigerant as a coolant. In both cases the ejector chiller could be applied as the most simple in design.

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Радченко, Андрій Миколайович, Богдан Сергійович Портной, Сергій Анатолійович Кантор, Олександр Ігорович Прядко et Іван Володимирович Калініченко. « ПІДВИЩЕННЯ ЕФЕКТИВНОСТІ ОХОЛОДЖЕННЯ ПОВІТРЯ НА ВХОДІ ГТД ХОЛОДИЛЬНИМИ МАШИНАМИ ШЛЯХОМ АКУМУЛЯЦІЇ ХОЛОДУ ». Aerospace technic and technology, n^o 4 (28 août 2020) : 22–27. http://dx.doi.org/10.32620/aktt.2020.4.03.

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The efficiency of air cooling at the inlet of gas turbine engines by exhaust heat conversion chiller, which transforms the GTE exhaust gases heat into cold, under variable climatic operating conditions, has been investigated. Considered is the use of a combined absorption-ejector exhaust heat conversion chiller with a step-by-step principle of air cooling at the gas turbine engines inlet: preliminary down to 15°C – by an absorption lithium-bromide chiller (ACh), which is used as a high-temperature air cooling stage, and further cooling down to 10°C – by a refrigerant ejector chiller (ECh) as a low-temperature cooling stage. Reserves have been identified for reducing the design (installed) refrigeration capacity of chillers by accumulating excess cold at reduced current heat loads with its use at increased heat loads. In this case, the design (installed) refrigeration capacity of chillers was determined by two methods: the first – based on the close to the maximum reduction in annual fuel consumption, the second – according to the maximum rate of increase in the reduction in annual fuel consumption. A scheme of the air cooling system at the gas turbine engines inlet using the refrigeration capacity reserve of the ACh, which provides preliminary cooling of the ambient air at the gas turbine engines inlet, in the booster stage, using the ACh accumulated excess refrigeration capacity has been proposed. The ACh excess refrigerating capacity, which is formed at decreased heat loads on the air coolers at the gas turbine engines inlet, is accumulated in the cold accumulator and is used at increased heat loads. The simulation results show the advisability of using the air cooling system at the gas turbine engine inlet with using the ACh accumulated excess refrigeration capacity, which allows reducing the ACh design (installed) refrigeration capacity by approximately 40%.

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Krajčík, Michal, Dominik Štrba, Michal Masaryk, Ondřej Šikula et Peter Mlynár. « Enhancing the efficiency of a steam jet ejector chiller for chilled ceiling ». Applied Thermal Engineering 211 (juillet 2022) : 118512. http://dx.doi.org/10.1016/j.applthermaleng.2022.118512.

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Radchenko, Roman, Victoria Kornienko, Mykola Radchenko, Dariusz Mikielewicz, Artem Andreev et Ivan Kalinichenko. « Cooling intake air of marine engine with water-fuel emulsion combustion by ejector chiller ». E3S Web of Conferences 323 (2021) : 00031. http://dx.doi.org/10.1051/e3sconf/202132300031.

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The fuel efficiency of cooling air at the inlet of marine low speed diesel engine with water-fuel emulsion combustion by ejector chiller utilizing the heat of exhaust gas along the route line Mariupol– Amsterdam–Mariupol was estimated. The values of available refrigeration capacity of ejector chiller, engine intake air temperature drop and corresponding decrease in specific fuel consumption of the main diesel engine at varying climatic conditions along the route line were evaluated. Their values for water-fuel emulsion were compared with conventional fuel oil combustion.

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Радченко, Микола Іванович, Ян Зонмін, Сергій Анатолійович Кантор et Богдан Сергійович Портной. « ОЦІНКА ЕФЕКТИВНОСТІ ГЛИБОКОГО ОХОЛОДЖЕННЯ ПОВІТРЯ НА ВХОДІ ГАЗОТУРБІННИХ УСТАНОВОК В РІЗНИХ КЛІМАТИЧНИХ УМОВАХ ». Aerospace technic and technology, n^o 1 (7 mars 2019) : 48–52. http://dx.doi.org/10.32620/aktt.2019.1.05.

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The efficiency of deep air cooling at the inlet of gas turbine units of a simple scheme has been investigated for changed climatic conditions of operation during the month. For air cooling, the application of waste heat recovery chiller has been proposed, which transform the heat of exhaust gases of gas turbine units into the cold. The efficiency of air cooling at the inlet of gas turbine units to different temperatures has been analyzed: to 15°C – an absorption lithium-bromide chiller, which is used as the first high-temperature pre-cooling stage of ambient air and down to 10°C – a combined absorption-ejector chiller, which acts as the second low-temperature stage. The air cooling efficiency is compared for different climatic conditions using the example of Yuzhnoukrainsk (Ukraine) and Shanghai (China). The climate peculiarity of Shanghai is the high relative humidity of the air, respectively, and its moisture contents at the same time its high temperatures. As indicators for assessing the effectiveness of air cooling at the inlet of gas turbine units down to 15°C in an absorption lithium-bromide chiller and deep air cooling to 10ºС, in a combined absorption-ejector chiller used an increase in useful power and a reduction in specific fuel consumption. It is shown that, through extremely different thermal and humidity parameters of ambient air, it is cooling at the inlet of gas turbine units for the climatic conditions of Ukraine provides the current increase in useful power by 10...15%, and for the climatic conditions of China – 18…22%. However, it should be noted that deeper air cooling at the inlet of the gas turbine unite to a temperature of 10°C in a combined absorption-ejector chiller compared to its traditional cooling to 15°C in an absorption lithium-bromide chiller provides an increase in useful power for a temperate climate of Ukraine (for example, Yuzhnoukrainsk) by 70...90%, whereas for tropical climatic conditions of China (Shanghai) – by 30...35%.

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Радченко, Микола Іванович, Євген Іванович Трушляков, Сергій Анатолійович Кантор, Богдан Сергійович Портной et Анатолій Анатолійович Зубарєв. « МЕТОД ВИЗНАЧЕННЯ ТЕПЛОВОГО НАВАНТАЖЕННЯ СИСТЕМИ КОНДИЦІЮВАННЯ ПОВІТРЯ ЗА МАКСИМАЛЬНИМ ТЕМПОМ ПРИРОЩЕННЯ ХОЛОДОПРОДУКТИВНОСТІ (на прикладі кондиціювання повітря енергетичного призначення) ». Aerospace technic and technology, n^o 4 (14 octobre 2018) : 44–48. http://dx.doi.org/10.32620/aktt.2018.4.05.

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It is justified the necessity of taking into consideration changes in thermal loads on the air conditioning system (heat and moisture treatment of air by cooling it with decreasing temperature and moisture content) in accordance with the current climatic conditions of operation. Since the effect of air cooling depends on the duration of its use and the amount of cold consumption, it is suggested that it be determined by the amount of cold spent per year for air conditioning at the GTU inlet, that is, for annual refrigerating capacity. The example of heat-using air conditioning at the inlet of a gas turbine unite (energy–efficient air conditioning systems) analyzes the annual costs of cooling for cooling ambient air to the temperature of 15 °C by an absorption lithium-bromide chiller and two-stage air cooling: to a temperature of 15 °C in an absorption lithium-bromide chiller and down to temperature 10 °С – in a refrigerant ejector chiller as the stages of a two-stage absorption-ejector chiller, depending on the installed (project) refrigerating capacity of waste heat recovery chiller.It is shown that, based on the varying rate of increment in the annual production of cold (annual refrigeration capacity) due to the change in the thermal load in accordance with current climatic conditions, it is necessary to select such a design thermal load for the air conditioning system (installed refrigeration capacity of chillers), which ensures the achievement of maximum or close to it annual production of cold at a relatively high rate of its increment. It is analyzed the dependence of the increment on the annual refrigerated capacity, relative to the installed refrigeration capacity, on the installed refrigeration capacity, in order to determine the installed refrigeration capacity, which provides the maximum rate of increase in the annual refrigerating capacity (annual production of cold). Based on the results of the research, it is proposed the method for determining the rational thermal load of the air conditioning system (installed – the design refrigeration capacity of the chiller) in accordance with the changing climatic conditions of operation during the year, which provides nearby the maximum annual production of cold at relatively high rates of its growth

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Sopian, Kamaruzzaman, J. Abdulateef, M. Alghoul et K. S. Yigit. « EVALUATION OF A COMBINED SOLAR-ASSISTED EJECTOR ABSORPTION CHILLER ». Journal of Mechanical Engineering 42, n^o 1 (30 juillet 2013) : 56–60. http://dx.doi.org/10.3329/jme.v42i1.15978.

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The experimental investigation of the performance of a combined solar ejector absorption coolingsystem has been carried out. The system was installed in the solar energy park at University KebangsaanMalaysia. The influence of various operating conditions on the COP is studied using evacuated tube solarcollectors and NH3-H2O as working fluid. The results showed that, the absorption chiller provides high COPthan that of the conventional absorption system. The maximum COP of the cycle in the order of 0.6 when theimprovements of rectifier and solution heat exchanger are added while the maximum increase in COP in case ofcombined cycle is about 50% higher than the basic cycle. This study is provided an actual compact unit of 1.5cooling capacity and operated under real outside conditions for Malaysia and similar tropical regions.DOI: http://dx.doi.org/10.3329/jme.v42i1.15978

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Mahmoudian, J., F. Mazzelli, A. Milazzo et A. Rocchetti. « Experimental and numerical activity on a prototype ejector chiller ». Journal of Physics : Conference Series 1599 (août 2020) : 012056. http://dx.doi.org/10.1088/1742-6596/1599/1/012056.

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Radchenko, Roman, Andrii Radchenko, Serhiy Serbin, Serhiy Kantor et Bohdan Portnoi. « Gas turbine unite inlet air cooling by using an excessive refrigeration capacity of absorption-ejector chiller in booster air cooler ». E3S Web of Conferences 70 (2018) : 03012. http://dx.doi.org/10.1051/e3sconf/20187003012.

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Two-stage Gas turbine unite (GTU) inlet air cooling by absorption lithium-bromide chiller (ACh) to the temperature 15 °C and by refrigerant ejector chiller (ECh) to 10 °C through utilizing the turbine exhaust gas heat for changeable ambient air temperatures and corresponding heat loads on the air coolers for the south Ukraine climatic conditions is analysed. An excessive refrigeration capacity of combined absorption-ejector chiller (AECh) exceeding the current heat loads and generated at decreased heat loads on the air coolers at the inlet of GTU can be used for covering increased heat loads to reduce the refrigeration capacity of AECh. The GTU inlet air cooling system with an ambient air precooling booster stage and a base two-stage cooling air to the temperature 10 °C by AECh is proposed. The AECh excessive cooling capacity generated during decreased heat loads on the GTU inlet air coolers is conserved in the thermal accumulator and used for GTU inlet air precooling in a booster stage of air cooler during increased heat loads. There is AECh cooling capacity reduction by 50% due to the use of a booster stage for precooling GTU inlet ambient air at the expense of an excessive cooling capacity accumulated in the thermal storage.

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Little, Adrienne B., Srinivas Garimella et John P. DiPrete. « Combined effects of fluid selection and flow condensation on ejector operation in an ejector-based chiller ». International Journal of Refrigeration 69 (septembre 2016) : 1–16. http://dx.doi.org/10.1016/j.ijrefrig.2016.04.011.

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Joemann, Michael, Tunay Oezcan, Michael Kauffeld et Clemens Pollerberg. « Process Steam and Chilled Water Production with CPC-collectors, Steam Jet Ejector Chiller and Latent Heat Storages ». Energy Procedia 91 (juin 2016) : 767–76. http://dx.doi.org/10.1016/j.egypro.2016.06.242.

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Radchenko1, Roman M., Dariusz Mikielewicz2, Mykola I. Radchenko1, Victoria S. Kornienko1, Andrii A. Andreev1 et Maxim A. Pyrysunko1. « Main engine of transport ship inlet air cooling by ejector chiller ». Joupnal of New Technologies in Environmental Science 5, n^o 3 (30 septembre 2020) : 33–48. http://dx.doi.org/10.30540/jntes-2020-3.3.

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The efficiency of cooling the air at the inlet of marine slow speed diesel engine turbocharger by ejector chiller utilizing the heat of exhaust gases and scavenge air were analyzed. The values of air temperature drop at the inlet of engine turbocharger and corresponding decrease in fuel consumption of the engine at varying climatic conditions on the route line Odesa-Yokogama- Odesa were evaluated.

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Thongtip, Tongchana, et Natthawut Ruangtrakoon. « Real Air-Conditioning Performance of Ejector Refrigerator Based Air-Conditioner Powered by Low Temperature Heat Source ». Energies 14, n^o 3 (30 janvier 2021) : 711. http://dx.doi.org/10.3390/en14030711.

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In this present work, the air-conditioning test performance of an ejector refrigerator-based air-conditioner (ERAC) was proposed. The ERAC was operated as the water chiller to produce the cooling load up to 4.5 kW. The chilled water temperature was later supplied to the fan-coil unit for producing the thermal comfort condition. The cooling water used to cool the condenser was achieved from the cooling tower which was operated under the hot and humid ambient. This is to demonstrate the feasibility of using the ERAC in real working conditions. The cooling load supplied to the air-conditioned space was applied by the air heater. The ERAC could efficiently be operated to produce the thermal comfort condition which was driven by the hot water temperature (Thot) of 90–98 °C. The system performance could vary with the heat source temperatures, cooling load, primary nozzle, and air-conditioned space temperature. The optimal performance was determined when varying the Thot, and, hence, the optimal Thot was indicated. The optimal Thot varied significantly with variations in the working condition. The test results demonstrated high potential to further using the ejector refrigeration system in the actual air conditioning application.

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Радченко, Андрій Миколайович, Богдан Сергійович Портной, Сергій Анатолійович Кантор et Ігор Петрович Єсін. « ОЦІНКА ЕФЕКТИВНОСТІ ГЛИБОКОГО ОХОЛОДЖЕННЯ ПОВІТРЯ НА ВХОДІ ГТУ ТЕПЛОВИКОРИСТОВУЮЧИМИ ХОЛОДИЛЬНИМИ МАШИНАМИ ». Aerospace technic and technology, n^o 6 (24 décembre 2019) : 10–14. http://dx.doi.org/10.32620/aktt.2019.6.02.

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Significant fluctuations in the current temperature and relative humidity of the ambient air lead to significant changes in the heat load on the air cooling system at the inlet of the gas turbine unit, which urgently poses the problem of choosing their design heat load, as well as evaluating the efficiency of the air cooling system for a certain period of time. The efficiency of deep air cooling at the inlet of gas turbine units was studied with a change during July 2015–2018 for climatic conditions of operation at the compressor station Krasnopolie, Dnepropetrovsk region (Ukraine). For air cooling, the use of a waste heat recovery chiller, which transforms the heat of exhaust gases of gas turbine units into the cold, has been proposed. The efficiency of air cooling at the inlet of gas turbine units for different temperatures has been analyzed: down to 15 °C – an absorption lithium-bromide chiller, which is used as the first high-temperature stage for pre-cooling of ambient air, and down to 10 °C – a combined absorption-ejector chiller (with using a refrigerant low-temperature air cooler as the second stage of air cooling). The effect of air-cooling was assessed by comparing the increase in the production of mechanical energy as a result of an increase in the power of a gas turbine unit and fuel saved during the month of July for 2015-2018 in accumulating. Deeper air cooling at the inlet of the gas turbine unit to a temperature of 10 °C in a combined absorption-ejector chiller compared to its traditional cooling to 15 °C in an absorption bromine-lithium chiller provides a greater increase in net power and fuel saved. It is shown that due to a slight discrepancy between the results obtained for 2015-2018, a preliminary assessment of the efficiency of air cooling at the inlet of gas turbine plants can be carried out for one year.

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Radchenko, Andrii, Mykola Radchenko, Hanna Koshlak, Roman Radchenko et Serhiy Forduy. « Enhancing the Efficiency of Integrated Energy Systems by the Redistribution of Heat Based on Monitoring Data ». Energies 15, n^o 22 (21 novembre 2022) : 8774. http://dx.doi.org/10.3390/en15228774.

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Integrated energy systems (IES) for combined power, heat and refrigeration supply achieved a wide application due to high flexibility in matching current loading. So as electricity is easily convertible into any other form of energy, gas engines are widely applied as driving engines characterized by high electrical and overall efficiency of about 45% and 90%, respectively. However, the highest thermal efficiency is achieved at full matching heat generated by the engine and heat transformed. This is often impossible in actual practice, especially if the heat is transformed into refrigeration by the most efficient and widespread absorption lithium-bromide chillers (ACh) and the heat not consumed by the ACh is removed from the atmosphere through an emergency radiator. The unused heat might be transformed by an ejector chiller (ECh) as the simplest and cheapest. So as the thermodynamic efficiency of any combustion engine is influenced essentially by the sucked air temperature, the excessive refrigeration produced by the ECh, is used for IES cooling to generate additional electricity and increase the electrical and overall efficiency of the engine. Such a redistribution of heat enables the enhancement of the efficiency of IES with an absorption-ejector chiller (AECh). The modified criteria for the comparative estimation of thermodynamic efficiency of innovative IESs with AEChs without overgenerated heat lost against a typical IES with an ACh and heat lost are proposed. In contrast to well-known electrical and heat efficiency, it considers the magnitude of heat loss and enables us to compare the heat efficiency of any version of transforming heat to refrigeration with an ideal basic version of IES based on a highly efficient ACh, transforming all the heat removed from the engine without heat loss. Some alternative scheme decisions for heat recovery systems have been developed based on monitoring data. They might be easily implemented into a typical IES with ACh.

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Фордуй, Сергій Георгійович, Андрій Миколайович Радченко, Анатолій Анатолійович Зубарєв, Володимир Володимирович Бойчук et Олексій Валерійович Остапенко. « РЕЗЕРВИ ПІДВИЩЕННЯ ЕФЕКТИВНОСТІ ТРАНСФОРМАЦІЇ ТЕПЛОТИ УСТАНОВКИ АВТОНОМНОГО ЕНЕРГОЗАБЕЗПЕЧЕННЯ ». Aerospace technic and technology, n^o 4 (31 août 2019) : 25–30. http://dx.doi.org/10.32620/aktt.2019.4.05.

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It is analyzed the efficiency of heat conversion in the integrated electricity, heat and cooling supply of the enterprise. The installation for energy supply includes two JMS 420 GS-N.LC GE Jenbacher cogeneration gas engines manufactured as cogeneration modules with heat exchangers for removing the heat of exhaust gases, scavenge gas-air mixture, cooling water of engine and lubricating oil. The heat of hot water is transformed by the absorption lithium-bromide chiller AR-D500L2 Century into the cold, which is spent on technological needs and for the operation of the central air conditioner for cooling the incoming air of the engine room, where from it is sucked by the turbocharger of the engine. The presence of significant heat losses, which account for about 30% of the total heat removed from the cogeneration gas piston module and is due to the inconsistency of the joint operation modes of the absorption lithium-bromide chiller and the gas piston engine, was revealed. This inconsistency is caused by the contradictory conditions of their effective operation according to the temperature of the return coolant at the outlet of the absorption lithium-bromide chiller and the entrance to the engine cooling system. The thermal state of the gas piston engine is ensured by maintaining the temperature of the return coolant at the entrance to it is not higher than 70 °C. At the same time, during the transformation of the heat of the coolant into the cold in an absorption lithium-bromide chiller, the temperature decreasing in the machine is no more than 10 ... 15 °С, that is, up to 75 ... 80 °С, if the temperature of the heat coolant outlet from the cogeneration gas piston module, i.e. at the inlet of the absorption lithium-bromide chiller, 90 °С. Therefore, the return coolant is additionally cooled in the "emergency heat release" radiator by removing its heat into surroundings. It is shown the possibility of increasing the cooling capacity of the system by conversion of the return coolant exhaust heat into cold in absorption lithium-bromide and ejector chillers through the data procession of monitoring the heat conversion system in the integrated energy plant.

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Yang, Zongming, Roman Radchenko, Mykola Radchenko, Andrii Radchenko et Victoria Kornienko. « Cooling Potential of Ship Engine Intake Air Cooling and Its Realization on the Route Line ». Sustainability 14, n^o 22 (14 novembre 2022) : 15058. http://dx.doi.org/10.3390/su142215058.

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A fuel efficiency of a ship engine increases with cooling inlet air. This might be performed by the chillers, which transform the heat of engine exhaust gas and scavenge air for refrigeration. The effect gained due to cooling depends on the intake air temperature drop and the time of engine operation at decreased intake air temperature. Thus, the cooling degree hour (CDH) number, calculated as air temperature depression multiplied by the duration of engine operation at reduced intake air temperature, is used as a primary criterion to estimate the engine fuel efficiency enhancement due to intake air cooling over the ship routes. The engine intake air cooling potential is limited by its value, available according to engine exhaust heat and the efficiency of heat conversion to refrigeration in the chiller, evaluated by the coefficient of performance (COP). Therefore, it should be determined by comparing both the needed and available values of CDH. The ejector chiller (ECh) was chosen for engine exhaust gas heat recovery to refrigeration as the simplest and cheapest, although it has a relatively low COP of about 0.3 to 0.35. However, the ECh generally consists of heat exchanges which are mostly adapted to be placed in free spaces and can be mounted on the transverse and board side bulkheads in the ship engine room. The values of sucked air temperature depression and engine fuel consumption reduction at varying temperatures and humidity of ambient air on the route were evaluated.

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Radchenko, R., M. Pyrysunko, M. Bogdanov et Yu Shcherbak. « A new approach to increasing the efficiency of the ship main engine air waste heat recovery cooling system ». Refrigeration Engineering and Technology 55, n^o 1 (10 février 2019) : 22–27. http://dx.doi.org/10.15673/ret.v55i1.1349.

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The efficiency of integrated cooling air at the intake of Turbocharger and Scavenge air at the inlet of working cylinders of the main diesel engine of dry-cargo ship by transforming the waste heat into a cold by an Refrigerant Ejector Chiller (ECh) as the most simple in design and reliable in operation and by complex in design but more efficient Absorption Lithium-Bromide Chiller (ACh) was analyzed. A ship power plant of cogeneration type using the relatively low-grade heat of water of a heat supply system with a temperature of about 90 °C, that significantly complicates the problem of its conversion into cold were considered. Because of the insufficiently high efficiency of transformation of the heat of hot water (low coefficient of performance) as compared with steam, the resulting cooling capacity may not be enough for cooling intake air of the turbocharger and scavenge air, that raises the problem of the rational distribution of heat loads between the Turbocharger Intake Air cooling circuit (subsystem) and Scavenge air cooling circuit and the need to use chillers of various types. This takes into account the rational parameters of cooling processes of the scavenge air in the cogeneration high-temperature stage of scavenge air cooler, in the intermediate stage of traditional cooling air with seawater, and in the low-temperature stage for deep cooling of the scavenge air by using a chiller. A new approach is proposed to improve the efficiency of integrated cooling Intake Air of the turbocharger and Scavenge Air at the inlet of the working cylinders of the ship main engine of a transport ship, which consists in comparing the required cooling capacity and the corresponding heat needs during the trade route with the available heat of exhaust gases and scavenge air of the cogeneration power plant, determining the deficit and excess cooling capacity of heat utilizing cooling machines of various types, that allows to identify and realize the reserves of improving the efficiency of cooling intake air of the turbocharger and the scavenge air of the main diesel engine through the joint use of chillers of various types.

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Pollerberg, Clemens, Ahmed Hamza H. Ali et Christian Dötsch. « Experimental study on the performance of a solar driven steam jet ejector chiller ». Energy Conversion and Management 49, n^o 11 (novembre 2008) : 3318–25. http://dx.doi.org/10.1016/j.enconman.2008.03.029.

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Dongellini, M., C. Naldi, C. Moser, S. Varga et G. L. Morini. « Primary energy saving potential of a solar-driven ejector cooling system : a case study for a Portuguese residential building ». Journal of Physics : Conference Series 2116, n^o 1 (1 novembre 2021) : 012117. http://dx.doi.org/10.1088/1742-6596/2116/1/012117.

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Abstract The seasonal energy performance of a cooling system based on an innovative variable-geometry ejector (VGE) is numerically investigated by using TRNSYS. The VGE-based system is mainly driven by solar energy, collected through solar thermal collectors, and is coupled to a residential building located in Porto. A biomass boiler is used as back-up heater. The energy performance of the investigated cooling system is compared with that of a conventional solution, based on a commercial air-to-water chiller. Results point out that, almost 75% of the generator heat demand can be supplied by solar collectors and about 90% of the overall energy input of the ejector-based system is satisfied by renewables. Moreover, numerical simulations confirm how the capability to vary the ejector geometry on the basis of current operating conditions allows to strongly improve the ejector seasonal efficiency. A second series of simulations aimed to further enhance the system performance. A master control logic which extends the VGE operation time in correspondence of favourable ambient conditions was introduced, in order to store additional cooling energy in the cold buffer tank. This strategy has proved to be effective, since the energy consumption of the biomass boiler could be reduced up to 35%.

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Радченко, Роман Николаевич. « ПОЛУЧЕНИЕ КОНДЕНСАТА КАК СОПУТСТВУЮЩЕГО ПРОДУКТА ОХЛАЖДЕНИЯ ВОЗДУХА НА ВХОДЕ ГАЗОТУРБИННОЙ УСТАНОВКИ ». Aerospace technic and technology, n^o 1 (25 février 2018) : 59–63. http://dx.doi.org/10.32620/aktt.2018.1.06.

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The processes of gas turbine unit inlet air cooling with generation of condensate as a subproduct were investigated. The heat-humidity processes in the two-stage air cooler of combined type with the first low temperature cooling stage were water with temperature of about 7 °C as a coolant for precooling air from the changeable ambient temperature to the temperature not lower than 15 °C is used and low temperature cooling stage with a refrigerant boiling at the temperature of 2-4 °C as a coolant for further deep cooling air to the temperature of about 10 °C by utilizing the exhaust gas waste heat in the absorption lithium-bromide chiller as the high temperature cooling stage and refrigerant ejector chiller as the low temperature cooling stage of the combined thermotransformer has been analyzed for daily changing ambient air temperatures and heat loads on the stages as consequence. The processes of generating the condensate as a subproduct of gas turbine unit intake air two-stage cooling were simulated by using the computer simulation programs of the firms-producers of heat equipment for more than twice decreased heat load upon the high temperature cooling stage as compared with a heat load upon the low temperature cooling stage. The data about amount of condensate extracted in each air cooler stage was summed up over a day, three days and July and its temperature was calculated. The results of calculation have shown that the temperature of condensate received in the refrigerant low temperature cooling stage are lower by about 4 °C as compared with its value for high temperature cooling stage with a chilled water temperature of 7 °C from absorption lithium-bromide chiller. It was also shown that inspite of intensive changeable current temperatures of condensate from each and both stages mean weighted values of temperature of condensate from both stages of a combined two-stage air cooler remained nearly unchangeable during days. A conclusion about using the condensate from low temperature cooling stage as a coolant has been made

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Портной, Богдан Сергійович. « КОМП’ЮТЕРНЕ МОДЕЛЮВАННЯ ПРОЦЕСІВ ОХОЛОДЖЕННЯ ПОВІТРЯ НА ВХОДІ ГАЗОТУРБІННОЇ УСТАНОВКИ З ВИЗНАЧЕННЯМ ЙОГО РАЦІОНАЛЬНОЇ ШВИДКОСТІ В ПОВІТРООХОЛОДЖУВАЧІ ». RADIOELECTRONIC AND COMPUTER SYSTEMS, n^o 3 (30 octobre 2018) : 29–33. http://dx.doi.org/10.32620/reks.2018.3.04.

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It is proposed to determine the rational velocity of air flow through the air coolers of a stepped a waste heat-recovery absorption-ejector chiller utilizing the heat of exhaust gases of a gas turbine unit to cool the air at the inlet, by computer simulation of air processes processing. Whereas the result of air cooling depends on the efficiency of the air coolers at the inlet of the gas turbine unit, it is proposed to determine it as an increase in the specific fuel economy, which consider both the cooling depth (the magnitude of the temperature decrease) of the air and the air resistance of the air cooler, which significantly affects the efficiency of operation cooling devices. On the example of air cooling at the inlet of a gas turbine unit has been analyzed the value of specific fuel economy by cooling the air at the inlet to a temperature of 10 °C in a two-stage absorption-ejector chiller, depending on the rational airflow rate through the cooling units (air coolers). The efficiency of the air coolers at different air flow rates has been analyzed.It is shown that proceeding from the different rate of increment in the specific fuel economy caused by the change in the rational velocity of air flow through the air coolers of chillers, it is necessary to choose a design (rational) the rational velocity of air flow that ensures the achievement of a maximum or close to the maximum increase in the specific fuel economy at relatively high rates increments. In order to determine the established the rational velocity of air flow through the air coolers, which provides the maximum increment of the specific fuel economy, the dependence of the increment of the specific fuel economy on the airflow velocity is analyzed. Based on the results of modeling air cooling processes at the inlet of the gas turbine unit, using software from firms that produce heat exchange equipment, it is proposed to determine the rational velocity of air through the air coolers, which ensures a close maximum specific fuel economy at relatively high rates of its increment

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Sutthivirode, Kittiwoot, et Tongchana Thongtip. « Performance improvement of ejector refrigerator–based water chiller working with different mixing chamber profiles ». Alexandria Engineering Journal 60, n^o 4 (août 2021) : 3693–707. http://dx.doi.org/10.1016/j.aej.2021.02.042.

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Pollerberg, Clemens, Michael Kauffeld, Tunay Oezcan, Matthias Koffler, Lucian George Hanu et Christian Doetsch. « Latent Heat and Cold Storage in a Solar-Driven Steam Jet Ejector Chiller Plant ». Energy Procedia 30 (2012) : 957–66. http://dx.doi.org/10.1016/j.egypro.2012.11.108.

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Krajčík, Michal, Michal Masaryk, Martin Šimko et Peter Mlynár. « Possibilities of combining radiant wall cooling with ejector cooling cycle powered by Fresnel solar collectors ». E3S Web of Conferences 172 (2020) : 03003. http://dx.doi.org/10.1051/e3sconf/202017203003.

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Solar ejector cooling presents an alternative to the commonly used compressor vapour machines. It is a potentially feasible technology for space cooling providing that the temperature of the cooling water is high enough to assure reasonable efficiency of the chiller. This could be achieved by increasing the evaporation temperature of the cooling cycle through its combination with a high-temperature radiant cooling system. We explore the possibilities and benefits of combining a high-temperature radiant wall system with a solar ejector cycle for space cooling of buildings. The lowest water temperature in the wall to prevent condensation was 18°C for the wall with pipes underneath the surface whereas it was 14°C for the wall with pipes embedded in the thermal core. Thus, the evaporation temperature was substantially higher for the radiant systems than for fancoils. For the conventional vapour compressor cooling, this increased the system efficiency (COP) by 30 to 50%. The COP of the ejector cooling cycle was about half of that for the compressor vapour cycle when R1234ze was used as the refrigerant, however, the primary energy was lower for ejector cooling. Using thermally active building systems (TABS) provided a reasonable cool storage capacity for as much as five hours which allows turning the cooling machines off for several hours during peaks in energy demand.

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Mahmoudian, Jafar, Federico Mazzelli, Andrea Rocchetti et Adriano Milazzo. « A heat-powered ejector chiller working with low-GWP fluid R1233zd(E) (Part2 : Numerical analysis) ». International Journal of Refrigeration 121 (janvier 2021) : 216–27. http://dx.doi.org/10.1016/j.ijrefrig.2020.10.016.

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Li, YingLin, Laizai Tan, Xiaosong Zhang et Kai Du. « Experimental evaluation of an ejector as liquid re-circulator in a falling-film water chiller ». International Journal of Refrigeration 40 (avril 2014) : 309–16. http://dx.doi.org/10.1016/j.ijrefrig.2013.11.001.

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Pollerberg, Clemens, Angelika Heinzel et Eckhard Weidner. « Model of a solar driven steam jet ejector chiller and investigation of its dynamic operational behaviour ». Solar Energy 83, n^o 5 (mai 2009) : 732–42. http://dx.doi.org/10.1016/j.solener.2008.11.003.

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Mahmoudian, Jafar, Andrea Rocchetti, Federico Mazzelli et Adriano Milazzo. « A heat-powered ejector chiller working with low-GWP fluid R1233zd(E) (Part 1 : Experimental results) ». International Journal of Refrigeration 121 (janvier 2021) : 1–9. http://dx.doi.org/10.1016/j.ijrefrig.2020.10.015.

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Kumar, Manoj. « Economic Evaluation of Solar Cooling Schemes ». International Journal of Energy Optimization and Engineering 6, n^o 1 (janvier 2017) : 23–48. http://dx.doi.org/10.4018/ijeoe.2017010102.

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This paper provides an economic evaluation and comparison of ejector, absorption and vapor compression systems driven either partly or fully by solar energy. Life cycle costing has been used to assess the relative economic ranks of eight solar cooling schemes. It has been shown that the capital cost of solar collectors is the dominant capital cost item in the total inventory of solar cooling plant, which has a strong influence on the system life cycle costs. Lower collector costs are therefore critical in establishing economically viable solar cooling systems. Primary energy analysis has been carried out and the running costs of chillers were determined for the maximum range of thermal and electric solar fractions and a number of annual equivalent full load hours of operation. The results indicate that two low temperature flat-plate collector assisted single-effect absorption chillers compete favorably with a PV assisted centrifugal mechanical compression chiller across the maximum range of thermal and electrical solar fractions. Low temperature options for solar cooling have been shown to be more economical than their high temperature counterparts. At current collector prices, solar cooling systems are still not cost effective compared with conventional centrifugal cooling systems, however, it is shown that at a collector cost of £57/m2 for thermal energy and £1.8/Wp for electrical energy, single-effect solar absorption and PV-centrifugal compression could become cost effective within an annual EFLH of 5840 hours. As such, the paper presents technical guidance on the procurement and operation of solar cooling plant. The novel energy and cost calculation methodology developed here can be applied globally to a wide range of solar collectors, chillers, heat rejection and ancillary subsystems.

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Bellos, Evangelos, et Christos Tzivanidis. « Parametric analysis and optimization of a cooling system with ejector-absorption chiller powered by solar parabolic trough collectors ». Energy Conversion and Management 168 (juillet 2018) : 329–42. http://dx.doi.org/10.1016/j.enconman.2018.05.024.

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Fong, K. F., C. K. Lee et T. T. Chow. « Improvement of solar-electric compression refrigeration system through ejector-assisted vapour compression chiller for space conditioning in subtropical climate ». Energy and Buildings 43, n^o 12 (décembre 2011) : 3383–90. http://dx.doi.org/10.1016/j.enbuild.2011.08.038.

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Li, Ying Lin, Ke Wang, Wei Wu, Xue Ying Xia, Bao Lian Niu et Zhong Bin Zhang. « Investigation on the effect of ejector liquid recirculation system on the performance of falling-film water chiller with R134a ». International Journal of Refrigeration 74 (février 2017) : 333–44. http://dx.doi.org/10.1016/j.ijrefrig.2016.11.009.

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Lillo, Gianluca, Rita Mastrullo, Alfonso William Mauro, Raniero Trinchieri et Luca Viscito. « Thermo-Economic Analysis of a Hybrid Ejector Refrigerating System Based on a Low Grade Heat Source ». Energies 13, n^o 3 (23 janvier 2020) : 562. http://dx.doi.org/10.3390/en13030562.

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The rising of the global energy demand requires the use of alternative energy conversion systems employing renewable sources. In the refrigeration and air conditioning fields, heat driven ejector systems represent a promising way to produce the cooling effect by using available low-grade temperature sources. In this paper, a thermo-economic analysis of a waste heat recovery hybrid ejector cycle (WHRHEC) was carried out. A thermodynamic model was firstly developed to simulate a WHRHEC able to obtain chilled water with a cooling load of 20 kW, by varying the working fluids and the pinch point values in the heat exchangers. Specific single- and two-phase heat transfer correlations were used to estimate the heat transfer surface and therefore the investment costs. The operative ranges that provide a reasonable compromise between the set-up costs and the cycle performances were then defined and compared to the current waste heat-driven technologies, such as absorption chillers and organic Rankine cycles (ORCs) coupled with vapor compression cycles (VCCs). The last part of the paper presents an economic analysis providing the map of the design (plant size) and contingent (specific cost of energy, waste heat availability) variables that lead to the economic convenience of a WHRHEC system when integrated to a conventional VCC plant.

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Milazzo, Adriano, et Andrea Rocchetti. « Modelling of ejector chillers with steam and other working fluids ». International Journal of Refrigeration 57 (septembre 2015) : 277–87. http://dx.doi.org/10.1016/j.ijrefrig.2015.05.015.

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