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Добірка наукової літератури з теми "COMPRESSION-ABSORPTION SYSTEM"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "COMPRESSION-ABSORPTION SYSTEM"

Fernández-Seara, José, Jaime Sieres, and Manuel Vázquez. "Compression–absorption cascade refrigeration system." Applied Thermal Engineering 26, no. 5-6 (April 2006): 502–12. http://dx.doi.org/10.1016/j.applthermaleng.2005.07.015.

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Jain, Vaibhav. "A Review of Vapor Compression-Absorption Integrated Refrigeration Systems." International Journal of Advance Research and Innovation 6, no. 2 (2018): 35–43. http://dx.doi.org/10.51976/ijari.621807.

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This paper provides a literature review on vapor compression-absorption integrated refrigeration systems. A number of research options are suggested by researchers to integrate vapor compression refrigeration system (VCRS) with vapor absorption refrigeration system (VARS). Each way has its own pros and cons. Present work provides a detailed review on working, parametric study, advantages and disadvantages of various configurations of vapor compression-absorption integrated refrigeration systems.

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Chen, Li-Ping, Liang Cai, Xiao Zhang, Xiao Xu, and Jing-Yi Qiao. "Hybrid electric vehicle absorption-compression refrigeration system." IOP Conference Series: Earth and Environmental Science 199 (December 19, 2018): 032072. http://dx.doi.org/10.1088/1755-1315/199/3/032072.

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Ramesh kumar, A., and . "Thermodynamic Analysis of Hybrid Absorption Compression System." International Journal of Engineering & Technology 7, no. 3.34 (September 1, 2018): 445. http://dx.doi.org/10.14419/ijet.v7i3.34.19356.

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The Virtual Reality realistic image content is a technology to enable building imaginary space by This paper presents thermodynamic studies conducted on a GAX hybrid absorption-compression (HYBRID) cycle using ammonia-water as working ﬂuid for air-conditioning applications. The effect of generator, condenser and absorber temperatures on exergy destruction has been investigated. The effect of absorber pressure on the exergy destruction of the cycle has also been studied. It is found that generator and absorber are the major contributors in the total exergy destruction of the hybrid cycle. Comparison of hybrid cycle with conventional GAX cycle shows hybrid cycle has lower value of exergy destruction than the conventional GAX cycle. It is also found that at same thermal conditions assumed in this work the hybrid cycle gives 18 percent increases in average exergetic efficiency when compared to the conventional GAX cycle.

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Agarwal, Shyam, B. B. Arora, and Akhilesh Arora. "Thermodynamic Analysis Of vapour-Absorption (H2O- LiBr)-Compression Combined Refrigeration System Energized Bya Microgas-Turbine." International Journal of Advance Research and Innovation 6, no. 4 (2018): 130–36. http://dx.doi.org/10.51976/ijari.641815.

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The current analysis comprises the configuration of combined refrigeration system which is integration of a vapour compression and vapour absorption system. The integrated system is energized by a microgas turbine to generate cooling at the low temperatures. The waste heat from the exhaust of microgas turbine is used to drive the vapour absorption system while the vapour compression system is directly powered by the small gas turbine. The compression system is at the low temperature stage while the absorption system is at high temperature stage boost the performance of compression system. A computational thermodynamic analysis of the combined system is carried out using mass energy governing equations. It has been concluded on the basis of result obtained that the performance of combined refrigeration systems is higher and less energy consuming.

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Ramanathan, Anand, and Prabhakaran Gunasekaran. "Simulation of absorption refrigeration system for automobile application." Thermal Science 12, no. 3 (2008): 5–13. http://dx.doi.org/10.2298/tsci0803005r.

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An automotive air-conditioning system based on absorption refrigeration cycle has been simulated. This waste heat driven vapor absorption refrigeration system is one alternate to the currently used vapour compression refrigeration system for automotive air-conditioning. Performance analysis of vapor absorption refrigeration system has been done by developing a steady-state simulation model to find the limitation of the proposed system. The water-lithium bromide pair is used as a working mixture for its favorable thermodynamic and transport properties compared to the conventional refrigerants utilized in vapor compression refrigeration applications. The pump power required for the proposed vapor absorption refrigeration system was found lesser than the power required to operate the compressor used in the conventional vapor compression refrigeration system. A possible arrangement of the absorption system for automobile application is proposed.

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Putra, Nandy, H. Ardiyansya, Ridho Irwansyah, Wayan Nata Septiadi, A. Adiwinata, A. Renaldi, and K. Benediktus. "Thermoelectric Heat Pipe-Based Refrigerator: System Development and Comparison with Thermoelectric, Absorption and Vapor Compression Refrigerators." Advanced Materials Research 651 (January 2013): 736–44. http://dx.doi.org/10.4028/www.scientific.net/amr.651.736.

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Thermoelectric coolers have been widely applied to provide cooling for refrigerators in addition to conventional absorption and vapor compression systems. To increase heat dissipation in the thermoelectric cooler’s modules, a heat pipe can be installed in the system. The aim of this study is to develop a thermoelectric heat pipe-based (THP) refrigerator, which consists of thermoelectric coolers that are connected by heat pipe modules to enhance heat transfer. A comparative analysis of the THP prototype and conventional refrigerator with vapor compression, absorption and thermoelectric systems is also presented. The prototype system has a faster cooling down time and a higher coefficient of performance than the absorption system but still lower than vapor compression system

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Wang, Lin, Shuang Ping Duan, and Xiao Long Cui. "Performance Analysis of Solar-Assisted Refrigeration Cycle." Applied Mechanics and Materials 170-173 (May 2012): 2504–7. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.2504.

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Energy-conservation and environmental protection are keys to sustainable development of domestic economy. The solar-assisted cascade refrigeration cycle system is developed. The system consists of electricity-driven vapor compression refrigeration system and solar-driven vapor absorption refrigeration system. The vapor compression refrigeration system is connected in series with vapor absorption refrigeration system. Refrigerant and solution reservoirs are designed to store potential to keep the system operating continuously without sunlight. The results indicate that the system obtains pretty higher COP as compared with the conventional vapor compression refrigeration system. COP of the new-type vapor compression refrigeration system increases as sunlight becomes intense.

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Xu, Yingjie, FuSheng Chen, Qin Wang, Xiaohong Han, Dahong Li, and Guangming Chen. "A novel low-temperature absorption–compression cascade refrigeration system." Applied Thermal Engineering 75 (January 2015): 504–12. http://dx.doi.org/10.1016/j.applthermaleng.2014.10.043.

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Ye, Bicui, Shufei Sun, and Zheng Wang. "Potential for Energy Utilization of Air Compression Section Using an Open Absorption Refrigeration System." Applied Sciences 12, no. 13 (June 23, 2022): 6373. http://dx.doi.org/10.3390/app12136373.

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In this paper, an open absorption refrigeration system is proposed to recover part of the waste compression heat while producing cooling capacity to further cool the compressed air itself. The self-utilization of the compression waste heat can significantly reduce the energy consumption of air compression, and hence increase the energy efficiency of the cryogenic air separation unit. To illuminate the energy distribution and energy conversion principle of the open absorption refrigerator-assisted air compression section, a thermodynamic model is built and the simulation work conducted based on a practical triple-stage air compression section of a middle-scale cryogenic air separation unit. Our results indicate that the energy saving ratio is mainly constrained by the distribution of the cooling load of compressed air, which corresponds to the heat load of the generator and cooling capacity of the evaporator in the open absorption refrigerator. The energy saving ratio ranges from 0.52–8.05%, corresponding to the temperature range of 5–30 °C and humidity range of 0.002–0.010 kg/kg. It is also estimated, based on the economic analysis, that the payback period of the open absorption refrigeration system is less than one year, and the net project revenue during its life cycle reaches USD 5.7 M, thus showing an attractive economic potential.

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Більше джерел

Дисертації з теми "COMPRESSION-ABSORPTION SYSTEM"

VILAFRANCA, MANGUÁN ANA. "Convesion of industrial compression cooling to absorption cooling in an integrated district heating and cooling system." Thesis, University of Gävle, University of Gävle, Department of Technology and Built Environment, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-4145.

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Astra Zeneca plant in Gärtuna has many compression cooling machines for comfort that consume about 11.7 GWh of electricity per year. Many of the cooling machines are old; due to the increase of production of the plant, cooling capacity was limited and new machines have been built. Now, the cooling capacity is over-sized. Söderenergi is the district heating plant that supplies heating to Astra Zeneca plant. Due to the strict environmental policy in the energy plant, last year, a bio-fuelled CHP plant was built. It is awarded with the electricity certificate system.

The study investigates the possibility for converting some of the compression cooling to absorption cooling and then analyzes the effects of the district heating system through MODEST optimizations. The effects of the analysis are studied in a system composed by the district heating system in Södertälje and cooling system in Astra Zeneca. In the current system the district heating production is from boiler and compression system supplies cooling to Astra Zeneca. The future system includes a CHP plant for the heating production, and compression system is converted to absorption system in Astra Zeneca. Four effects are analyzed in the system: optimal distribution of the district heating production with the plants available, saving fuel, environmental impact and total cost. The environmental impact has been analyzed considering the marginal electricity from coal condensing plants. The total cost is divided in two parts: production cost, in which district heating cost, purchase of electricity and Emissions Trading cost are included, and investment costs. The progressive changes are introduced in the system as four different scenarios.

The introduction of the absorption machines in the system with the current district heating production increases the total cost due to the low electricity price in Sweden. The introduction of the CHP plant in the district heating production supposes a profit of the production cost with compression system due to the high income of the electricity produced that is sold to the grid; it profit increases when compression is replaced by absorption system. The fuel used in the production of the future system decreases and also the emissions. Then, the future system becomes an opportunity from an environmental and economical point of view. At higher purchase electricity prices predicted in the open electricity market for an immediately future, the future system will become more economically advantageous.

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Wong, Choong Wah. "An absorption recompression system." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320018.

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Ibrahim, G. A. "An investigation into liquid film absorbers for refrigeration systems." Thesis, King's College London (University of London), 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245436.

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Ara, Paulo José Schiavon. "Desempenho de sistemas de condicionamento de ar com utilização de energia solar em edifícios de escritórios." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/3/3146/tde-01032011-135653/.

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A preocupação energética tem impulsionado a humanidade a buscar alternativas sustentáveis de energia. Neste contexto, os edifícios de escritórios têm um papel importante, em especial, devido ao elevado consumo de energia dos sistemas de condicionamento de ar. Para esses sistemas, a possibilidade de utilização de energia solar é uma alternativa tecnicamente possível e interessante de ser considerada, principalmente porque, quando a carga térmica do edifício é mais elevada, a radiação solar também é mais elevada. Dentre os sistemas de condicionamento de ar solar, o sistema térmico - que associa coletores solares térmicos com chiller de absorção - é o mais disseminado, na atualidade. Entretanto, dependendo do caso, outras tecnologias podem ser vantajosas. Uma opção, por exemplo, no caso de edifícios de escritórios, é o sistema elétrico - que associa painéis fotovoltaicos ao chiller convencional de compressão de vapor. Neste trabalho, para um edifício de escritórios de 20 pavimentos e 1000 m2 por pavimento, na cidade de São Paulo, no Brasil, duas alternativas de ar condicionado solar tiveram seus desempenhos energéticos analisados: o sistema térmico - com coletores solares térmicos somente na cobertura e o sistema elétrico - com painéis FV somente nas superfícies opacas das fachadas. Para isso, com o software EnergyPlus do Departamento de Energia dos Estados Unidos obteve-se as carga térmica atuantes no edifício e com a aplicação do método de cálculo de consumo de energia dos sistemas de ar condicionado solar, proposto pelo Projeto SOLAIR da União Européia, adaptado para a realidade da pesquisa, obteve-se o desempenho energético dos sistemas. Os resultados mostraram que, para o edifício de 20 pavimentos, o sistema elétrico tem o melhor desempenho energético, economizando 28% e 71% da energia elétrica que consumiria um sistema de ar condicionado convencional, em um dia de verão e de inverno, respectivamente. O sistema térmico, ao contrário, apresentou um desempenho energético ruim para o edifício estudado, consumindo, por exemplo, em um dia de verão, cerca de 4 vezes mais energia elétrica do que um sistema de ar condicionado convencional. Constatouse que isso ocorreu, pois a área coletora limitada à cobertura foi insuficiente para atender a demanda do chiller de absorção, que passou a operar com frações solares baixas, da ordem de 50% e 20%, de pico, no dia de inverno e de verão, respectivamente. Assim, constatou-se que para que o sistema térmico apresente um desempenho energético satisfatório é preciso que o edifício não seja tão alto. De fato, os resultados mostraram que somente se o edifício tivesse no máximo 2 pavimentos, o sistema térmico teria um desempenho energético melhor do que um sistema convencional. No caso de ser aplicado ao edifício térreo de 1000m2 de área, por exemplo, esse sistema economizaria aproximadamente 65% da energia elétrica do sistema convencional. Por fim, constatou-se também que o desempenho energético do sistema térmico seria elevado com a otimização da área e da tecnologia de coletores solares, com o aprimoramento do sistema de aquecimento auxiliar e com a redução da carga térmica do edifício por meio de técnicas passivas de climatização.
Energy concern has driven human kind to seek sustainable energy alternatives. In this context, office buildings have an important role, especially due to the high energy consumption of air conditioning systems. For these systems, the possibility of using solar energy is technically feasible and interesting to be considered, mainly because generally when the building thermal load is higher, the solar radiation is also higher. Among solar airconditioning systems, the thermal system - which combines solar collectors with absorption chiller - is the most widespread, nowadays. However, depending on the case, other technologies may take advantage. One option, for example, in the case of office buildings, is the electrical system - which combines photovoltaic panels with conventional vapor compression chiller. In this work, an office building of 20 floors with 1,000 m2 floor area, in Sao Paulo, Brazil, two technologies of solar air conditioning had their performance analyzed: the thermal system - presenting solar thermal collectors only on the roof and the electrical system with PV panels only on the opaque surfaces of the facades. For this, the software EnergyPlus of the United States Department of Energy obtained the building thermal load and the with the solar air conditioning energy consumption calculating method proposed by SOLAIR project of the European Union and adapted to this work, energy performance of systems was obtained. The results showed that for this building, the electrical system had the best energy performance, saving 28% and 71% of electricity that would consume a conventional air conditioning system in a summer day and a winter day, respectively. The thermal system, in contrast, showed a poor energy performance, consuming, for example, on a summer day, about four times more electricity than a conventional air conditioning system. It was found that this occurred because the collectors area limited to the roof of the building was insufficient to meet the absorption chiller demand, causing low solar fractions in the operation, of around 50% and 20% peak, in a winter day and in a summer day, respectively. Thus, in order of provide a satisfactory energy performance, the thermal system requires that the building not to be so tall. In fact, the results showed that only if the building had up to two floors, the system would perform better than a conventional system. In case of be installed in a building with the ground floor only, and floor area of 1000m2, for example, this system would save about 65% of the electricity comparing to a conventional system. Finally, it was found that this energy performance would be elevated as well with the optimization of solar collectors area and technology, with auxiliary heating system improvement and with the reduction of thermal load of the building by means of passive air conditioning techniques.

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Saulich, Sven. "Generic design and investigation of solar cooling systems." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/13627.

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This thesis presents work on a holistic approach for improving the overall design of solar cooling systems driven by solar thermal collectors. Newly developed methods for thermodynamic optimization of hydraulics and control were used to redesign an existing pilot plant. Measurements taken from the newly developed system show an 81% increase of the Solar Cooling Efficiency (SCEth) factor compared to the original pilot system. In addition to the improvements in system design, new efficiency factors for benchmarking solar cooling systems are presented. The Solar Supply Efficiency (SSEth) factor provides a means of quantifying the quality of solar thermal charging systems relative to the usable heat to drive the sorption process. The product of the SSEth with the already established COPth of the chiller, leads to the SCEth factor which, for the first time, provides a clear and concise benchmarking method for the overall design of solar cooling systems. Furthermore, the definition of a coefficient of performance, including irreversibilities from energy conversion (COPcon), enables a direct comparison of compression and sorption chiller technology. This new performance metric is applicable to all low-temperature heat-supply machines for direct comparison of different types or technologies. The achieved findings of this work led to an optimized generic design for solar cooling systems, which was successfully transferred to the market.

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Prathiiikar, Anil Kumar. "Simulation and optimization compression-absorption refrigeration system." Thesis, 2006. http://localhost:8080/iit/handle/2074/5183.

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KUMAR, CHANDAN. "THERMODYNAMIC ANALYSIS OF TWO-STAGE VAPOUR COMPRESSION REFRIGERATION SYSTEM INTEGRATED WITH AN ABSORPTION SYSTEM (LiBr-H2O)." Thesis, 2014. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15450.

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This work comprises energetic and exergetic analysis of two thermodynamic cycles: First one is a conventional two stage cooling system by steam compression of ammonia and the other is named integrated refrigeration system. The conventional system that has been used as reference in this work is largely used for cooling purpose in industrial sector. The integrated refrigeration system is similar to the conventional system, but it uses the intermediate cooling, between the stages of high and low pressure, by cold water in closed circuit. The cold water is supplied by LiBr-H2O absorption system integrated to the conventional compression system. The heat input is obtained from waste material. Therefore, the energy supplied to the integrated refrigeration system is assumed of zero cost. Numeric simulation is used to compare the behaviour of both cycles. The results obtained in this comparison show that the integrated refrigeration system operates with a reduction of up to 9.70 % in COP. However, the integrated refrigeration system presented an increase of up to 11.89% in exergetic efficiency and 34.46% in refrigerating capacity in relation to the conventional system. These results, together with decrease in operational cost which will be valuable in further study, will make very attractive the use of the integrated refrigeration system.

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Книги з теми "COMPRESSION-ABSORPTION SYSTEM"

Åhlby, Lena. Compression/absorption cycles for large heat pump: System simulations. Stockholm: Swedish Council for Building Research, 1989.

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Chinnappa, J. C. V. A solar-assisted absorption-compression cascaded hybrid air-conditioning system: Tests in Townsville and predicted performance in Darwin : report submitted to Department of Mines and Energy, Northern Territory Government. Townsville, Qld: Dept. of Civil and Systems Engineering, James Cook University, 1989.

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Voorhees, Gardner Tufts. Refrigerating Machines : Compression, Absorption: Comparison of Capacities and Economies of Compression and Absorption Systems, and of Combined Compression and Absorption Systems. Being the Complete Text, Figures, and Diagrams of the Paper Entitled Compar. Creative Media Partners, LLC, 2018.

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Voorhees, Gardner Tufts. Refrigerating Machines : Compression, Absorption: Comparison of Capacities and Economies of Compression and Absorption Systems, and of Combined ... and Diagrams of the Paper Entitled Compar. Franklin Classics Trade Press, 2018.

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Частини книг з теми "COMPRESSION-ABSORPTION SYSTEM"

Khaliq, Abdul, and Ibrahim Dincer. "Thermodynamic Assessment of Waste Heat Operated Combined Compression–Absorption Refrigeration System." In Progress in Exergy, Energy, and the Environment, 193–205. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04681-5_17.

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Safaei, Samaneh, Farshid Keynia, Sam Haghdady, Azim Heydari, and Mario Lamagna. "Design of CCHP System with the Help of Combined Chiller System, Solar Energy, and Gas Microturbine." In The Urban Book Series, 79–91. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-29515-7_9.

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AbstractThis work was conducted to design a combined cooling, heating, and power (CCHP) system with photovoltaic energy which provides simultaneous generation of electricity, heat, and cold for a high-rise office building (23 floors) in the city of Mashhad in Iran. Our strategy was to supply load electric, thermal, and refrigeration with the help of solar energy. In addition, its superiority over other systems was evaluated. Analysis and study of solar radiation and the maximum level of solar panels use, according to the architectural plan, were carried out at the project site. The analysis of shadow points, the use of inverters and electrical detectors to increase the maximum solar power, and its cost-effectiveness were carefully studied via PVSOL software. Additionally, the amount of heat, cold, and electricity consumption was accurately calculated according to international standards and utilizing HAP software. The criteria for saving on the initial cost reduction, carbon dioxide emission reduction, operating cost reduction, payback period, revenue, and the minimum life expectancy of the equipment compared to those in other methods were also evaluated. The results obtained from the designed system of simultaneous generation of electricity, heat, and refrigeration, which combines gas microturbines as the primary stimulus, a combination of absorption and compression chiller to provide refrigeration load, a boiler for auxiliary heat load, and a thermal photovoltaic system to produce both electric and thermal loads, were finally revealed. This is believed to be a cost-effective strategy for high-rise residential or commercial buildings with a geographical location like that of Mashhad. Based on the electricity sales to the grid, with the rate of increase in inflation in electricity tariffs, this design in the Mashhad project was estimated to have an annual income of 166.676 thousand dollars. Moreover, the initial capital return period in this project was calculated to be 5.19 years.

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Åhlby, L., and D. Hodgett. "The Compression-Absorption Cycle: A High-Temperature Application." In Applications and Efficiency of Heat Pump Systems, 59–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-662-30179-1_6.

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Ziegler, F., and G. Hämmer. "Experimental Results of a Double-Lift Compression-Absorption Heat Pump." In Applications and Efficiency of Heat Pump Systems, 49–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-662-30179-1_5.

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Alefeld, Georg, and Reinhard Radermacher. "Rules for the Design of Multistage, Absorption Heat Pumps, Heat Transformers, Vapor-Compression Heat Pumps, Heat Engines, and Cascades." In Heat Conversion Systems, 123–32. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003418306-5.

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Hassan, Ibrahim Galal, Athanasios I. Papadopoulos, Panos Seferlis, Mohammad Azizur Rahman, Sambhaji T. Kadam, and Alexios Kyriakides. "Current Progress in District Cooling Infrastructures and Their Evolution to Integrated Vapor Absorption-Compression Refrigeration Systems." In Proceedings of the 5th International Conference on Building Energy and Environment, 2577–85. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-9822-5_276.

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N., Kapilan, and Vidhya P. "Applications of Nano Materials in Cold Storage." In Applications of Nanomaterials in Agriculture, Food Science, and Medicine, 252–69. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-5563-7.ch014.

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Nano particles (NPs) have superior properties and hence can be used for various applications. The cold storage is most widely used in the preservation of agricultural and horticultural products. The cold storage maybe operated by vapour compression or vapour absorption cooling system. The operating cost of this system can be reduced by using renewable energy systems and thermal energy storage systems. The NPs are used to increase the performance of renewable energy and thermal storage systems. In recent years, phase change materials are used to increase heat transfer rate in solar cold storage units. The NPs can be used to absorb the ethylene gas produced during storage of fruits, so that the shelf life, freshness, firmness, and texture of the fruits can be maintained for longer storage duration. The NPs coatings also increases the shelf life and freshness of the fruits. This chapter discusses NPs, types of NPs, basics of cold storage systems, use of NPs in solar integrated cold storage, and effect of NPs coatings on fruits stored in cold storage.

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Kubade, Pravin R., Amol N. Patil, and Hrushikesh B. Kulkarni. "Structure Properties Relationship Studies of Vinyl Ester Hybrid Syntactic Foam." In Handbook of Research on Advancements in Manufacturing, Materials, and Mechanical Engineering, 368–94. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4939-1.ch018.

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Syntactic foam is the porous composite produced by mixing prefabricated hollow spherical particle into the matrix. Syntactic foams are used as energy absorption sandwich core for several applications like marine, automotive, and aerospace. In this work, low density hollow glass microspheres are hybridized with fly ash cenosphere in Bisphenol-A epoxy-based vinyl ester matrix. Hybrid syntactic foams is created with 60% total filler content. Within these hybrid systems internal composition of two fillers were varied in a step of 25 vol% with respect to each other. Hybrid syntactic foams are prepared by the hand lay-up (molding) method. The physical characterization parameter contains density and matrix porosity whereas tensile, quasi-static compression, flexural (3-point bending), Izod impact, and micro Vickers hardness are grouped as mechanical characterization parameters. Scanning electron microscopy was performed on fractured surfaces to examine deformation and fracture mechanisms related with each loading condition.

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Boyaghchi, Fateme A., and Motahare Mahmoodnezhad. "Comparative Study of Two Solar Cascade Absorption-Compression Refrigeration Systems Based on Energy and Exergy Methods." In Exergetic, Energetic and Environmental Dimensions, 457–74. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-12-813734-5.00026-3.

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Тези доповідей конференцій з теми "COMPRESSION-ABSORPTION SYSTEM"

Atallah, Fady, Srikanth Madala, Suresh B. Sadineni, and Robert F. Boehm. "Optimization of a Coupled Vapor Compression and Absorption Cooling System Driven by Gas Fueled IC Engine." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54292.

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In recent years, due to the increased fossil fuel costs and environmental concerns, there has been a renewed interest in absorption cooling (using low-grade heat source) systems for refrigeration and space cooling applications. Although, the stand-alone coefficient of performance (COP) is a concern with such systems, absorption cooling can be a useful add-on that improves the overall efficiency of conventional vapor compression cooling cycle. A local company based in Las Vegas which is involved in the development of advanced HVAC technologies, has developed a natural gas fueled internal combustion (IC) engine driven heat pump. This system recovers the rejected heat from the IC engine during the heating cycle, thus, increasing the heat delivered and improving the system’s overall efficiency. However, during the cooling cycle the rejected heat is dissipated to the ambient air through radiators. The overall efficiency of the system can be improved if the heat rejected during the cooling cycle can be recovered and used for space cooling or refrigeration applications. In this study, a vapor compression refrigeration system coupled with an absorption cooling system is simulated using MATLAB. The vapor compression system is driven by a natural gas fueled IC engine and the waste heat from the engine is used to drive the absorption cooling system. The waste heat is recovered both from gas exhaust and engine cooling systems. The developed simulation model is used to find the transients of both the vapor absorption and compressions systems for varied cooling demands. Important parameters such as coolant temperature and exhaust gas temperature are obtained from experimental data. This paper presents the most efficient load distribution between the vapor compression and absorption cooling systems.

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Chiriac, Victor, and Florea Chiriac. "Miniaturized Refrigeration System With Absorption: Application to Microelectronics Cooling." In ASME 2007 InterPACK Conference collocated with the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ipack2007-33726.

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The study develops an analytical model of an optimized small scale refrigeration system using a thermo-chemical compressor, with application to the cooling of the electronic components populating a Printed Circuit Board (PCB) in a High-Power Microelectronics System. This work continues the authors’ previous study of a refrigeration system with mechanical compression and ejector compression [1–3]. However, the present study introduces the thermo-chemical compressor, comprised of an absorber-desorber unit, also known as refrigeration with absorption. This is a viable alternative to the mechanical compression systems, providing an improved feasibility and reliability at smaller scales. The proposed system includes miniaturized refrigeration components, designed to fit smaller scale power electronics, and uses a binary water-ammonia solution, compact heat exchangers with meso-channels and hydrogen as compensation gas in order to eliminate the circulation pump. The efficiency of the system is evaluated and further compared to mechanical compression designs at similar cooling powers. The study also discusses the thermodynamic cycle specifics and provides an extensive analytical evaluation and calculation of each miniaturized component design. The COP of the system is ∼ 0.4 – 0.5. The study is concluded by identifying the pros and cons of implementing such an absorption system to real-life microelectronics applications. The advantages of the optimized refrigeration design are highlighted, establishing a performance vs. size comparison to vapor-compression refrigerators, to serve as the basis for the enhanced cooling of future miniaturized refrigeration applications.

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Kumar, Anil, and Anish Modi. "Thermodynamic analysis of an air source ejector assisted compression-absorption-resorption refrigeration system." In 3RD INTERNATIONAL CONFERENCE ON ENERGY AND POWER, ICEP2021. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0115193.

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Cruz, Ricardo Wilson, and Silvia Azucena Nebra. "Thermoeconomic Analysis of a Cogeneration System of Compression Ignition Engine and Absorption Refrigeration Machine." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33182.

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This paper is a first attempt to evaluate a refrigeration with cogeneration system focusing on a 915 kW genset/90 ton aqua-ammonia absorption system capable of supplying refrigeration, e.g. for cold storage warehouses for food conservation in the Northern Brazilian autonomous grid. The first and second law joined formulation, i.e. exergy, is used in order to determine irreversibilities and to address the exergetic and monetary costs of the system.

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Qiu, Zezheng, Yulie Gong, Huashan Li, and Weibin Ma. "Studies on an Ammonia-Water Compression-Absorption Cooling System (CACS) Drived by Solar Energy." In 2011 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring (CDCIEM). IEEE, 2011. http://dx.doi.org/10.1109/cdciem.2011.23.

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Qiu, Zezheng, Wenjun Leng, Jun Wang, and Liping Pang. "Performance of a Compression-absorption Heat pump System Driven by Low-temperature Geothermal Water." In 2015 International Conference on Mechatronics, Electronic, Industrial and Control Engineering. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/meic-15.2015.253.

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Kadam, Sambhaji, Muhammad Saad Khan, Alexios-Spyridon Kyriakides, Athanasios I. Papadopoulos, Ibrahim Hassan, Mohammad Azizur Rahman, and Panos Seferlis. "Thermodynamic, Environmental and Cost Evaluation of Compression-Absorption Parallel and Cascade Refrigeration Chiller." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-70886.

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Abstract A district cooling system (DCS), that generally operates with vapor compression refrigeration (VCR) chillers, is superior to conventional air conditioning as it helps to reduce energy consumption and to protect the environment by reducing carbon dioxide emissions. The advantages of the district cooling plant can be further enhanced by integrating the VCR system with a vapor absorption refrigeration system (VAR). In this context, this paper presents the comparative assessment of a VCR chiller and two configurations of an integrated VCR and VAR chiller, consisting of the parallel and the cascade configuration. Two refrigerant-absorbent mixtures in the VAR system are considered, namely the conventional NH3/H2O and the novel acetaldehyde/N,N-dimethylformamide (Acet/DMF). The energy, exergy, environmental and economic analysis of the systems have been performed considering the coefficient of performance (COP), the exergy efficiency (ηexergy), the total equivalent warming impact (TEWI) and the cost rate (Ċtot) as performance indicators. It is observed that the connection of the evaporator of the VAR with the condenser of the VCR in the cascade configuration increases the COP of the VCR unit by 292% compared to the stand-alone VCR system. Overall, the COP of the parallel and the cascade refrigeration system with the novel Acet/DMF is better than that of NH3/H2O. This performance can further be improved by enhancing the exergy efficiency. Overall, the thermodynamic, environmental and cost benefits of the novel Acet/DMF with the cascade arrangement of the VCR and the VAR system are superior to those of NH3/H2O.

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Kung, Yi-Shu, Ming Qu, and Steve Peng. "Model Based Analysis of an Integrated System of Vapor-Compression Chiller and Absorption Heat Pump." In ASME 2013 7th International Conference on Energy Sustainability collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/es2013-18410.

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Subcooling of the refrigerant at the exit of the condenser in a vapor compression refrigeration system could be an effective method to improve the coefficient of performance (COP). This method allows the refrigerant entering the evaporator with a lower mass fraction of vapor and absorbs more heat in the evaporator. The effort in this paper investigates a solar based integrated system of an electricity-driven vapor-compression chiller (VC) and an absorption heat pump (ABS) to provide both heating and cooling to space. Thermodynamic and heat transfer models of the integrated system were developed to estimate the system performance. The modeling results showed the integrated system can achieve 40% of the reduction on electricity consumption and 66% of the improvement in cooling COP. Furthermore, the hot water supply temperature can reach 50.25°C. The models have also been used to conduct parametric sensitivity analysis. The key parameters which affect the performance of the system were the heat source temperature, the hot water return temperature, and the outdoor air flow rate. Hot water flow rate only has significant influence on the hot water supply temperature. Increasing the temperature and flow rate of the heat source can have benefits on both heating and cooling performance. However, increasing the outdoor air flow rate can only benefit on energy saving and cooling performance.

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Patil, Samved, K. Max Zhang, Aditya Sahasrabuddhe, and Shrewans Padhye. "Design and Analysis of a Continuous Operating Solar Absorption Cooling System." In ASME 2010 4th International Conference on Energy Sustainability. ASMEDC, 2010. http://dx.doi.org/10.1115/es2010-90298.

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It has been estimated that approximately 15% of electricity produced in the whole world is utilized for refrigeration and air-conditioning applications. Increased use of air conditioning and related appliances during hot summer days leads to high electricity demands in metropolitan areas, which have to be met, in part, by generations from expensive and polluting peaking units. Thus solar cooling has great potential in reducing peaking electricity demands and the overall energy demands. We first compared the overall efficiencies of two solar cooling systems, i.e., vapor compression powered by electricity generated from photovoltaics, and vapor absorption using solar heating. Both systems matched evenly when the coefficients of performance (COP) were compared. But the payback time for vapor compression was five times longer than that for vapor absorption. Then we designed a novel solar cooling system by combining vapor absorption refrigeration (NH3-H2O absorption cycle), concentrated solar and thermal storage. The system is capable of operating autonomously at nights or two days without adequate sunlight. Heating oil is heated by a parabolic trough collector and is then stored in an insulated tank. The oil is then used to heat the refrigerants (i.e., NH3). Oil flows in two loops, one from parabolic collector to tank using thermo-syphon action and other from the tank to refrigerator using a small pump. Next, we created a model to calculate the volume of storage tank, area of solar collector for a given longitude and latitude and application. A micro-processor controlled program can be then be developed in future to control mass flow of oil in the second loop to control the output temperature.

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Souza, Gleidson, José V. C. Vargas, Wellington Balmant, Marcos C. Campos, Leonardo C. Martinez, Juan C. Ordóñez, and André B. Mariano. "A Hybrid Absorption System With Generator Level Optical Control and Variable Flow Rate." In ASME 2019 Heat Transfer Summer Conference collocated with the ASME 2019 13th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ht2019-3708.

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Abstract Current refrigeration and air conditioning systems are mostly based on the vapor compression cycle, which require electrical energy input. Absorption systems have gained new interest due to the possibility of utilizing waste heat as energy input. In addition, the environmental impact generated by such systems is recognized as much smaller than vapor compression systems. Therefore, this work developed and characterized an absorption refrigeration system with an innovative generator level optical control and variable working fluid mass flow rate, with potential for use in industrial, commercial and residential heating, ventilation, air conditioning, and refrigeration (HVAC & R) systems. The system is hybrid, since it was designed to be fed with heat from the burning of different fuels and/or waste heat sources in complementary fashion. The system consists of: a condenser, an evaporator, two expansion valves, two absorbers, a centrifugal pump, a regenerative heat exchanger, a generator, a rectifier, a generator level optical control system, and two liquid accumulators. The developed level control system consists of 3 light Dependent Resistors (LDR) positioned inside a box built around a transparent level meter, and illuminated internally by a low power light bulb. A frequency inverter and a centrifugal pump allow for the working fluid solution inside the generator to be within a safe range for efficient cooling cycle operation. The system measured refrigeration capacity rate was 2.3 TR, which qualifies as a good performance, since the equipment was originally designed for 1 TR.

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