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Artykuły w czasopismach na temat "LIBR-H20"
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Patel, Sonu. "A Thermodynamic Performance Analysis of Triple Effect Vapour Absorption Refrigeration System Using LiBr-H2O". International Journal for Research in Applied Science and Engineering Technology 9, nr 11 (30.11.2021): 1394–99. http://dx.doi.org/10.22214/ijraset.2021.38891.
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Abstract: Being an eco-friendly system and a cheaper way to produce cooling effect absorption refrigeration system (ARS) is becoming more popular as it can produce higher cooling capacity than vapor compression refrigeration systems, and it can be powered by other sources of energy (like waste heat from gas and steam turbines, or can utilizes renewable source of heat by sun, geothermal, biomass) other than electricity. In the recent years, the interest in absorption refrigeration system is growing because these systems have environmentally friendly refrigerant and absorbent pairs. In this study, a detail energetic analysis of triple stage LiBr-H20 absorption system using First law of thermodynamics is done. An Energy Equation Solver code are used to simulate the computer program is developed for the cycle and results are validated with past studies available is also done. Mass, energy and exergy balance equations and the various complementary relations constitute the simulation model of the triple effect refrigeration system. Further, the effect of exit temperature of generator, absorber, condenser and evaporator on COP, solution concentration and other parameters are studied. It was found in the study that COP increases with increasing the generator exit temperature keeping the absorber exit temperature constant but when the absorber exit temperature is increased COP tends to decrease and the concentration of weak solution leaving HP generator (Xw3), MP generator (Xw2) and LP generator (Xw1) also increases with increase in generator exit temperature, while it decreases with increase in condenser exit temperature. Keywords: Absorption Refrigeration System (ARS), LiBr + H2O, COP, solution concentration, Energy Equation Solver code, energetic analysis, triple effect refrigeration system.
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Yadav, Varun, Supradeepa Panual G, Neeraj Yadav, Ratnam Bordia, Rohini Soni i Rinkesh Khandey. "Design and Fabrication of Solar Powered Vapour Absorption Refrigeration System". E3S Web of Conferences 170 (2020): 02011. http://dx.doi.org/10.1051/e3sconf/202017002011.
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Engineering is all about the application of knowledge and ideas for continuous development in society. In today’s world, there is a strong need for an environment-friendly refrigerating system, therefore, our focus is on a solar powered vapour absorption refrigeration system. This project focuses on a cooling system that minimizes the dependency over electricity and to show our ability to save our resources for future generations. The objective of this work was to design and fabricate a vapour absorption refrigeration system, using LiBr-H20, as the refrigerants and powered by solar energy. Performance Evaluation of the system has been done on the basis of different operating conditions and parameters like, solar irradiance, collector, generator, condenser and evaporator temperature. The COP of the system was obtained as 0.1 and the capacity was 0.01 TR. Since it’s an ab-initio development it will be a unique one in terms of understanding and underlying engineering. The system is an eccentric one that can be operated by multiple heat sources like solar energy, biomass etc. without much change in the design. This system can be used to develop an Air Conditioner, Refrigerator or a Chiller.
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Perier-Muzet, Maxime, i Nolwenn Le Pierres. "Modeling and analysis of energetic and exergetic efficiencies of a LiBr/H20 absorption heat storage system for solar space heating in buildings". Energy Efficiency 9, nr 2 (11.06.2015): 281–99. http://dx.doi.org/10.1007/s12053-015-9362-2.
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Nonguierma, Yves Christian, Amadou Konfe i Dieudonné Joseph Bathiebo. "P-T-X and P-T-h Diagrams of the Working Pair H20/LiBr at Thermodynamic Equilibrium and Charts that Permit to Determine its Thermodynamic Properties". Physical Science International Journal, 31.12.2020, 19–42. http://dx.doi.org/10.9734/psij/2020/v24i1130223.
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The thermodynamic properties at equilibrium, in this case, enthalpy, pressure, temperature, mass fraction, of working pairs are very important for researchers and in the design of absorption refrigeration systems. Although some authors have carried out their research in this direction by setting up empirical formulas, there are unfortunately no charts or easy-to-use diagrams making it possible to have these properties for the couple H20/LiBr. The aim of this present study is to make a small contribution by making charts and diagrams available to all, making it possible to quickly and easily obtain the properties of lithium bromide at thermodynamic equilibrium.
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Rizza, J. J. "Solar-Driven LiBr/H20 Air Conditioning System With a R-123 Heat Pump Assist". Journal of Solar Energy Engineering 136, nr 1 (16.07.2013). http://dx.doi.org/10.1115/1.4024741.
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This paper presents an energy system that utilizes solar energy to produce air conditioning with an absorption refrigeration system. Since there is often a temporal variance between the availability of the required solar energy and the demand for commercial building air conditioning, a liquid natural gas (LNG) subsystem is often used to supplement the solar-thermal array system. Because of operating cost consideration, this paper proposes the use of a R-123 heat pump to supply the required additional heat and temperature needed to effectively operate the absorption air conditioning system. Waste heat from the absorption system water condenser is used by the R-123 heat pump subsystem evaporator to supply the additional required heat at the appropriate temperature to the absorption system generator using the R-123 heat pump subsystem condenser. Under conditions when the pricing ratio of electric power and LNG is at certain level or when LNG is not available, the proposed R-123 heat pump subsystem offers a cost effective option. The solar-thermal collector array and R-123 heat pump are in a series just before the generator of the absorption system. The temperature differential between the absorption system water condenser temperature and the required absorption system generator temperature is relatively moderate, so that the coefficient of performance of the R-123 heat pump subsystem is sufficiently high to be a competitive alternative when compared to a LNG assist subsystem. Because of this moderate temperature difference, the proposed R-123 heat pump assist subsystem appears to be a better choice under certain conditions, than the use of LNG to raise the solar-thermal array transport fluid temperature to the required generator temperature when the solar-thermal array system fails to do so.
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Syngounas, Evangelos, Dimitrios Tsimpoukis, Maria K. Koukou i Michail G. Vrachopoulos. "Energetic, exergetic and financial evaluation of a solar-powered absorption chiller integration into a CO2 commercial refrigeration system". Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 29.03.2022, 095765092210775. http://dx.doi.org/10.1177/09576509221077540.
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This study investigates the integration of a solar absorption chiller by means of subcooling to a CO2 booster system that serves the refrigeration needs of a supermarket refrigeration plant with an installed capacity of 80 kW and 20 kW for medium and low-temperature regimes, respectively. The proposed energy saving configuration is analyzed in an energetic, exergetic, and financial manner, using the climatic data for the city of Athens, Greece. The current approach constitutes the theoretical reference for the actual implementation of this novelty either in new plants or as a retrofit in existing ones. The proposed solution includes the employment of a single-stage absorption chiller operating with LiBr–H20 working pair, which is driven by heat produced in evacuated tube collectors installed in the store’s rooftop. The energy analysis is conducted with validated numerical models that are developed in MATLAB using the CoolProp library. The collecting area and the corresponding chiller capacity of the proposed configuration are selected through financial evaluation. More specifically, the collecting area is analyzed parametrically from 25 m2 to 200 m2. Finally, 100 m2 of collecting area with 60 kW of chiller capacity are proved to be the optimum solution financially with 8.4 years payback period and 44.57 k€ net present value. This optimum solution results in an annual power consumption decrease of 8.12% which leads to energy savings of 27.45 MWh/year.
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Syngounas, Evangelos, Dimitrios Tsimpoukis, Maria K. Koukou i Michail Gr Vrachopoulos. "Integration of a solar-powered absorption chiller for performance enhancement of a supermarket CO2 refrigeration plant". Green Energy and Sustainability, 20.02.2022, 1–24. http://dx.doi.org/10.47248/ges2202010003.
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CO2 refrigeration configurations are the most viable solution for commercial refrigeration plants, which are however accompanied with energy challenges due to their low energy efficiency when operating under high ambient temperatures. This study examines the coupling of a CO2 booster system with a solar absorption chiller, used to sub-cool the CO2 of the main cycle. The refrigeration system under study is projected to cover the cooling requirements of a supermarket refrigeration plant with an installed capacity of 80 kWR for the medium and 20 kWR for the low-temperature circuit, in the region of Athens, Greece. The investigated process involves utilization of an absorption chiller module with 60 kWR of cooling capacity working with a LiBr-H20 pair powered by heat produced in fifty evacuated-tube solar collectors with a total collecting area of 115 m2. The energy performance analysis was based on validated numerical models developed in MATLAB using the CoolProp library. Through parametric analysis the coefficient of performance (COP) of the proposed topology was compared to the COP of a conventional booster system under constant low (450 W/m2) and high (800 W/m2) incident solar radiation for the temperature range 1–40 °C, resulting in maximum COP increments of 26.44% and 47.34% respectively. Performance simulation on an annualized basis was also conducted, by using the average hourly values of ambient temperature and solar radiation for every month of the year. The results showed that in comparison to the conventional booster system, the sub-cooling rates achieved a maximum increment of COP of 47.48% hourly and 16.36% monthly for August which is the warmest month of the year. Annual electricity consumption decreased by 8.93%, resulting in an energy savings of 30.19 MWh/year.
Rozprawy doktorskie na temat "LIBR-H20"
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Kürthy, Marián. "Kogenerační jednotka s absorpčním TČ". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230314.
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This diploma work aims to evaluate the functional connection of the cogeneration unit with an internal combustion engine and an absorption heat pump to increase the heating effect of the cogeneration. The aim of this work is to design a functional system and evaluate it from the technical - economic terms. In the introduction of the theoretical work the applied cogeneration technologies used in combined heat and power production are presented. Then there is described the principle of heat pumps, their basic components and theoretical comparison of compression and absorption heat pumps. In the practical part of this work is for a specific application in the area Technická 2 proposed merger of the cogeneration unit with an internal combustion engine and an absorption heat pump, while detailed design parameters used in absorption heat circulation are set. At the end of this paper there are designed various heat exchangers of applied absorption heat pump. The final part of the work is devoted to technical - economic assessment of applied design. In this assestment three different types of heat pumps are compared: Absorption heat pump with working solution H2O-LiBR, absorption heat pump with working fluids NH3-H2O and compressor heat pump.
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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.