Absorption Refrigeration System

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Shiming Deng - One of the best experts on this subject based on the ideXlab platform.

  • Theoretical analysis of low-temperature hot source driven two-stage LiBr/H2O Absorption Refrigeration System
    International Journal of Refrigeration-revue Internationale Du Froid, 1999
    Co-Authors: Shiming Deng
    Abstract:

    Abstract A detailed theoretical analysis is presented for a two-stage LiBr/H2O Absorption Refrigeration System, which consists of an evaporator, a low-pressure absorber, a low-pressure generator, a high-pressure absorber, a high-pressure generator, a condenser, a low-pressure heat exchanger and a high-pressure heat exchanger, driven by a low-temperature hot source. A comparison of results from the theoretical analysis and preliminary experiment indicates that the theoretical analysis developed can represent a real System with a reasonable accuracy, and is useful for future development.

  • theoretical analysis of low temperature hot source driven two stage libr h2o Absorption Refrigeration System
    International Journal of Refrigeration-revue Internationale Du Froid, 1996
    Co-Authors: W B, Shiming Deng
    Abstract:

    Abstract A detailed theoretical analysis is presented for a two-stage LiBr/H2O Absorption Refrigeration System, which consists of an evaporator, a low-pressure absorber, a low-pressure generator, a high-pressure absorber, a high-pressure generator, a condenser, a low-pressure heat exchanger and a high-pressure heat exchanger, driven by a low-temperature hot source. A comparison of results from the theoretical analysis and preliminary experiment indicates that the theoretical analysis developed can represent a real System with a reasonable accuracy, and is useful for future development.

Pradeepta K. Sahoo - One of the best experts on this subject based on the ideXlab platform.

Rajesh Kumar - One of the best experts on this subject based on the ideXlab platform.

  • Integration of Water-Lithium Bromide Absorption Refrigeration System with Diesel engine: A Thermodynamic Study
    2014
    Co-Authors: Rahul Singh, Supriya Vats, Neelam Baghel, Rajesh Kumar
    Abstract:

    This paper examines through a thermodynamic analysis the feasibility of using waste heat from Diesel engines to drive an ammonia-water Absorption Refrigeration System. An energy balance of a diesel engine shows that sufficient waste heat is provided. The results illustrate that higher performance of the System is obtained at generator temperature in near 361K for single effect and then starts decreases till 371K.

  • Exergy analysis of double effect vapor Absorption Refrigeration System
    International Journal of Energy Research, 2008
    Co-Authors: Abdul Khaliq, Rajesh Kumar
    Abstract:

    Energy and exergy analyses previously performed by the authors for a single effect Absorption Refrigeration System have been extended to double effect vapor Absorption Refrigeration System with the expectation of reducing energy supply as well as an interest in the diversification of the motive power employed by HVAC technologies. The total exergy destruction in the System as a percentage of the exergy input from a generator heating water over a range of operating temperatures is examined for a System operating on LiBr–H2O solution. The exergy destruction in each component, the coefficient of performance (COP) and the exergetic COP of the System are determined. It is shown that exergy destructions occur significantly in generators, absorbers, evaporator2 and heat exchangers while the exergy destructions in condenser1, evaporator1, throttling valves, and expansion valves are relatively smaller within the range of 1–5%. The results further indicate that with an increase in the generator1 temperature the COP and ECOP increase, but there is a significant reduction in total exergy destruction of the System for the same. On the other hand, the COP and ECOP decrease with an increase in the absorber1 temperature while the total exergy destruction of the System increases significantly with a small increase in the absorber1 temperature. The results show that the exergy method can be used as an effective criterion in designing an irreversible double effect Absorption Refrigeration System and may be a good tool for the determination of the optimum working conditions of such Systems. Copyright © 2007 John Wiley & Sons, Ltd.

  • Thermodynamic evalaution of a modified aqua-ammonia Absorption Refrigeration System
    Energy Conversion and Management, 1991
    Co-Authors: Rajesh Kumar, S C Kaushik
    Abstract:

    Abstract This short communication presents a modified version of the basic aqua-ammonia Absorption Refrigeration System. The heat released during the Absorption process is utilized to heat the strong solution coming out of the absorber. Thus, the heat required for further heating the solution in the generator is considerably reduced and, hence, yields enhanced coefficients of performance. Detailed thermodynamic analysis of the modified aqua-amonia Absorption System is carried out to study the effects of various operating parameters, such as generator temperature, condenser temperature, absorber temperature, rectification column and the effectiveness of the heat exchangers, on the COP and various heat/mass transfer rates. It is found that an improvement of about 10% in the COP for the modified Absorption cycle is achieved at an evaporator temperature of 0°C.

Boris Huirem - One of the best experts on this subject based on the ideXlab platform.

Omer Kaynakli - One of the best experts on this subject based on the ideXlab platform.

  • energy and exergy analysis of a double effect Absorption Refrigeration System based on different heat sources
    Energy Conversion and Management, 2015
    Co-Authors: Omer Kaynakli, Kenan Saka, Faruk Kaynakli
    Abstract:

    Abstract Absorption Refrigeration Systems are environmental friendly since they can utilize industrial waste heat and/or solar energy. In terms of heat source of the Systems, researchers prefer one type heat source usually such as hot water or steam. Some studies can be free from environment. In this study, energy and exergy analysis is performed on a double effect series flow Absorption Refrigeration System with water/lithium bromide as working fluid pair. The Refrigeration System runs on various heat sources such as hot water, hot air and steam via High Pressure Generator (HPG) because of hot water/steam and hot air are the most common available heat source for Absorption applications but the first law of thermodynamics may not be sufficient analyze the Absorption Refrigeration System and to show the difference of utilize for different type heat source. On the other hand operation temperatures of the overall System and its components have a major effect on their performance and functionality. In this regard, a parametric study conducted here to investigate this effect on heat capacity and exergy destruction of the HPG, coefficient of performance (COP) of the System, and mass flow rate of heat sources. Also, a comparative analysis is carried out on several heat sources (e.g. hot water, hot air and steam) in terms of exergy destruction and mass flow rate of heat source. From the analyses it is observed that exergy destruction of the HPG increases at higher temperature of the heat sources, condenser and absorber, and lower temperature of the HPG, LPG and evaporator. This destruction is maximized when hot air heat source is used and minimized with utilizing hot water heat source.

  • second law based thermodynamic analysis of water lithium bromide Absorption Refrigeration System
    Energy, 2007
    Co-Authors: Muhsin Kilic, Omer Kaynakli
    Abstract:

    In this study, the first and the second law of thermodynamics are used to analyze the performance of a single-stage water-lithium bromide Absorption Refrigeration System (ARS) when some working parameters are varied. A mathematical model based on the exergy method is introduced to evaluate the System performance, exergy loss of each component and total exergy loss of all the System components. Parameters connected with performance of the cycle–circulation ratio (CR), coefficient of performance (COP), Carnot coefficient of performance (COPc), exergetic efficiency (ξ) and efficiency ratio (τ)–are calculated from the thermodynamic properties of the working fluids at various operating conditions. Using the developed model, the effect of main System temperatures on the performance parameters of the System, irreversibilities in the thermal process and non-dimensional exergy loss of each component are analyzed in detail. The results show that the performance of the ARS increases with increasing generator and evaporator temperatures, but decreases with increasing condenser and absorber temperatures. Exergy losses in the expansion valves, pump and heat exchangers, especially refrigerant heat exchanger, are small compared to other components. The highest exergy loss occurs in the generator regardless of operating conditions, which therefore makes the generator the most important component of the cycle.

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