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T.k. Gogoi – One of the best experts on this subject based on the ideXlab platform.

  • exergy analysis of a h2o licl absorption refrigeration system with operating Temperatures estimated through inverse analysis
    Energy Conversion and Management, 2016
    Co-Authors: T.k. Gogoi, D Konwar

    Abstract:

    Abstract In this study, operating Temperatures of a H2O–LiCl vapor absorption refrigeration system (VARS) are first estimated using an inverse technique with weak solution concentration as objective function and a differential evolution (DE) optimization algorithm for objective function minimization. Total 34 combinational Temperatures are obtained and for each of these combinations the VARS energetic and exergetic performance results are presented. Parametric analysis is performed to show performance variation with component Temperatures. A performance comparison between H2O–LiCl and H2O–LiBr systems is also provided under identical conditions. Results show that coefficient of performance (COP) increases with evaporator Temperature while the exergy efficiency decreases and the total system irreversibility increases. COP is also more at lower condenser and Absorber Temperature, however the exergy efficiency becomes less and total system irreversibility increases. This contradiction arises due to the water Temperatures at entry and exit of the condenser, evaporator and Absorber which are considered to vary with component Temperatures in this analysis. However magnitude wise the exergy efficiency is more and total system irreversibility is less when variable water Temperatures are considered instead of fixed. It was found that VARS performance variation with generator Temperature solely depends upon selection of condenser and Absorber Temperatures. H2O–LiCl system is found superior to the H2O–LiBr system.

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  • Exergy analysis of a H2O–LiCl absorption refrigeration system with operating Temperatures estimated through inverse analysis
    Energy Conversion and Management, 2016
    Co-Authors: T.k. Gogoi, D Konwar

    Abstract:

    Abstract In this study, operating Temperatures of a H2O–LiCl vapor absorption refrigeration system (VARS) are first estimated using an inverse technique with weak solution concentration as objective function and a differential evolution (DE) optimization algorithm for objective function minimization. Total 34 combinational Temperatures are obtained and for each of these combinations the VARS energetic and exergetic performance results are presented. Parametric analysis is performed to show performance variation with component Temperatures. A performance comparison between H2O–LiCl and H2O–LiBr systems is also provided under identical conditions. Results show that coefficient of performance (COP) increases with evaporator Temperature while the exergy efficiency decreases and the total system irreversibility increases. COP is also more at lower condenser and Absorber Temperature, however the exergy efficiency becomes less and total system irreversibility increases. This contradiction arises due to the water Temperatures at entry and exit of the condenser, evaporator and Absorber which are considered to vary with component Temperatures in this analysis. However magnitude wise the exergy efficiency is more and total system irreversibility is less when variable water Temperatures are considered instead of fixed. It was found that VARS performance variation with generator Temperature solely depends upon selection of condenser and Absorber Temperatures. H2O–LiCl system is found superior to the H2O–LiBr system.

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  • Exergy based parametric analysis of a combined reheat regenerative thermal power plant and water–LiBr vapor absorption refrigeration system
    Energy Conversion and Management, 2014
    Co-Authors: T.k. Gogoi, K. Talukdar

    Abstract:

    Abstract In this paper, exergy analysis of a combined reheat regenerative steam turbine (ST) based power cycle and water–LiBr vapor absorption refrigeration system (VARS) is presented. Exergetic efficiency of the power cycle and VARS, energy utilization factor (EUF) of the combined system (CS) and irreversibility in each system component are calculated. The effect of fuel flow rate, boiler pressure, cooling capacity and VARS components’ Temperature on performance, component and total system irreversibility is analyzed. The second law based results indicate optimum performance at 150 bar boiler pressure and VARS generator, condenser, evaporator and Absorber Temperature of 80 °C, 37.5 °C, 15 °C and 35 °C respectively. The present exergy based results conform well to the first law based results obtained in a previous analysis done on the same combined system. Irreversibility distribution among various power cycle components shows the highest irreversibility in the cooling tower. Irreversibility of the exhaust flue gas leaving the boiler and the boiler are the next major contributors. Among the VARS components, exergy destruction in the generator is the highest followed by irreversibility contribution of the Absorber, condenser and the evaporator.

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K. Talukdar – One of the best experts on this subject based on the ideXlab platform.

  • Exergy based parametric analysis of a combined reheat regenerative thermal power plant and water–LiBr vapor absorption refrigeration system
    Energy Conversion and Management, 2014
    Co-Authors: T.k. Gogoi, K. Talukdar

    Abstract:

    Abstract In this paper, exergy analysis of a combined reheat regenerative steam turbine (ST) based power cycle and water–LiBr vapor absorption refrigeration system (VARS) is presented. Exergetic efficiency of the power cycle and VARS, energy utilization factor (EUF) of the combined system (CS) and irreversibility in each system component are calculated. The effect of fuel flow rate, boiler pressure, cooling capacity and VARS components’ Temperature on performance, component and total system irreversibility is analyzed. The second law based results indicate optimum performance at 150 bar boiler pressure and VARS generator, condenser, evaporator and Absorber Temperature of 80 °C, 37.5 °C, 15 °C and 35 °C respectively. The present exergy based results conform well to the first law based results obtained in a previous analysis done on the same combined system. Irreversibility distribution among various power cycle components shows the highest irreversibility in the cooling tower. Irreversibility of the exhaust flue gas leaving the boiler and the boiler are the next major contributors. Among the VARS components, exergy destruction in the generator is the highest followed by irreversibility contribution of the Absorber, condenser and the evaporator.

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  • exergy based parametric analysis of a combined reheat regenerative thermal power plant and water libr vapor absorption refrigeration system
    Energy Conversion and Management, 2014
    Co-Authors: T.k. Gogoi, K. Talukdar

    Abstract:

    Abstract In this paper, exergy analysis of a combined reheat regenerative steam turbine (ST) based power cycle and water–LiBr vapor absorption refrigeration system (VARS) is presented. Exergetic efficiency of the power cycle and VARS, energy utilization factor (EUF) of the combined system (CS) and irreversibility in each system component are calculated. The effect of fuel flow rate, boiler pressure, cooling capacity and VARS components’ Temperature on performance, component and total system irreversibility is analyzed. The second law based results indicate optimum performance at 150 bar boiler pressure and VARS generator, condenser, evaporator and Absorber Temperature of 80 °C, 37.5 °C, 15 °C and 35 °C respectively. The present exergy based results conform well to the first law based results obtained in a previous analysis done on the same combined system. Irreversibility distribution among various power cycle components shows the highest irreversibility in the cooling tower. Irreversibility of the exhaust flue gas leaving the boiler and the boiler are the next major contributors. Among the VARS components, exergy destruction in the generator is the highest followed by irreversibility contribution of the Absorber, condenser and the evaporator.

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Jinping Liu – One of the best experts on this subject based on the ideXlab platform.

  • optimal Temperature of collector for solar double effect libr h2o absorption cooling system in subtropical city based on a year round meteorological data
    Applied Thermal Engineering, 2014
    Co-Authors: Jinping Liu

    Abstract:

    Abstract The Temperature of collector is one of the important parameters that determine the performance of solar cooling system. The paper mainly deals with the optimal Temperature of collector for solar double effect LiBr/H2O absorption refrigeration system in subtropical city. The study of paper is based on the parametric analysis and does not consider the pressure drop and heat loss of system. The optimal Temperature of collector is that maximizes the monthly mean performance of system. Based on the measured year round meteorological data of subtropical Guangzhou, it was found that the optimal Temperature of collector is not identical for different months. For the system without the hot fluid storage tank in which the tilted angle of collector is 20° toward to south, evaporation Temperature is 5 °C, condensation Temperature is 43 °C, Absorber Temperature is 40 °C and the energy distribution ratio of generator is 1.5, its optimal inlet Temperature of collector from April to October is 100, 100, 100, 110, 110, 110 and 125 °C, respectively. The corresponding maximum monthly average total efficiency of system from April to October is 0.241, 0.278, 0.304, 0.407, 0.43, 0.434 and 0.458, respectively. The influence of evaporator Temperature, condenser Temperature, Absorber Temperature and the energy distribution ratio, on the optimum Temperature of collector was analyzed. The comparison of optimal collector Temperature for the system with and without the hot storage tank was also carried out. The paper is helpful to improve the performance of solar double effect LiBr/H2O absorption cooling system in subtropical city.

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  • Optimal Temperature of collector for solar double effect LiBr/H2O absorption cooling system in subtropical city based on a year round meteorological data
    Applied Thermal Engineering, 2014
    Co-Authors: Jinping Liu

    Abstract:

    Abstract The Temperature of collector is one of the important parameters that determine the performance of solar cooling system. The paper mainly deals with the optimal Temperature of collector for solar double effect LiBr/H2O absorption refrigeration system in subtropical city. The study of paper is based on the parametric analysis and does not consider the pressure drop and heat loss of system. The optimal Temperature of collector is that maximizes the monthly mean performance of system. Based on the measured year round meteorological data of subtropical Guangzhou, it was found that the optimal Temperature of collector is not identical for different months. For the system without the hot fluid storage tank in which the tilted angle of collector is 20° toward to south, evaporation Temperature is 5 °C, condensation Temperature is 43 °C, Absorber Temperature is 40 °C and the energy distribution ratio of generator is 1.5, its optimal inlet Temperature of collector from April to October is 100, 100, 100, 110, 110, 110 and 125 °C, respectively. The corresponding maximum monthly average total efficiency of system from April to October is 0.241, 0.278, 0.304, 0.407, 0.43, 0.434 and 0.458, respectively. The influence of evaporator Temperature, condenser Temperature, Absorber Temperature and the energy distribution ratio, on the optimum Temperature of collector was analyzed. The comparison of optimal collector Temperature for the system with and without the hot storage tank was also carried out. The paper is helpful to improve the performance of solar double effect LiBr/H2O absorption cooling system in subtropical city.

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