Absorption Chiller

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Jocelyn Millette - One of the best experts on this subject based on the ideXlab platform.

  • simulation of an ammonia water Absorption Chiller
    Renewable Energy, 2013
    Co-Authors: Brice Le Lostec, Nicolas Galanis, Jocelyn Millette
    Abstract:

    An increased interest in Absorption Chillers has been observed [1] because these systems can utilize solar, geothermal and biomass energy sources, but also because they are quiet, vibration-free, require little maintenance and are ecological [2]. Instead of a compressor system, which uses electricity, an Absorption cooling system, using renewable energy and kinds of waste heat energy, may be used for cooling. This paper presents the simulation of a single stage solar Absorption Chiller operating with an ammonia–water mixture under steady state conditions. This simulation is based on heat and mass balances for each component. The heat and mass transfers in the absorber, the condensation of binary vapor of ammonia–water in the condenser and a thermosyphon desorber placed under the purification column were modeled. The numerical model was compared and validated with experimental data obtained with a solar Absorption Chiller. The calculated results agree well with experimental data. Simulations based on experimental data were used to predict the temperature and concentration profiles in each heat exchanger. A parametric study was conducted to investigate the effect of evaporator and desorber temperature on the Absorption Chiller's performance. The COP decreases by 25% with a decrease of 10 °C in evaporator temperature and the COP increases by 4% with an increase of 10 °C in desorber temperature.

  • Simulation of an ammonia–water Absorption Chiller
    Renewable Energy, 2013
    Co-Authors: Brice Le Lostec, Nicolas Galanis, Jocelyn Millette
    Abstract:

    An increased interest in Absorption Chillers has been observed [1] because these systems can utilize solar, geothermal and biomass energy sources, but also because they are quiet, vibration-free, require little maintenance and are ecological [2]. Instead of a compressor system, which uses electricity, an Absorption cooling system, using renewable energy and kinds of waste heat energy, may be used for cooling. This paper presents the simulation of a single stage solar Absorption Chiller operating with an ammonia–water mixture under steady state conditions. This simulation is based on heat and mass balances for each component. The heat and mass transfers in the absorber, the condensation of binary vapor of ammonia–water in the condenser and a thermosyphon desorber placed under the purification column were modeled. The numerical model was compared and validated with experimental data obtained with a solar Absorption Chiller. The calculated results agree well with experimental data. Simulations based on experimental data were used to predict the temperature and concentration profiles in each heat exchanger. A parametric study was conducted to investigate the effect of evaporator and desorber temperature on the Absorption Chiller's performance. The COP decreases by 25% with a decrease of 10 °C in evaporator temperature and the COP increases by 4% with an increase of 10 °C in desorber temperature.

  • Simulation of an ammonia-water Absorption Chiller
    Renewable Energy, 2013
    Co-Authors: Brice Le Lostec, Nicolas Galanis, Jocelyn Millette
    Abstract:

    An increased interest in Absorption Chillers has been observed [1] because these systems can utilize solar, geothermal and biomass energy sources, but also because they are quiet, vibration-free, require little maintenance and are ecological [2]. Instead of a compressor system, which uses electricity, an Absorption cooling system, using renewable energy and kinds of waste heat energy, may be used for cooling. This paper presents the simulation of a single stage solar Absorption Chiller operating with an ammonia-water mixture under steady state conditions. This simulation is based on heat and mass balances for each component. The heat and mass transfers in the absorber, the condensation of binary vapor of ammonia-water in the condenser and a thermosyphon desorber placed under the purification column were modeled. The numerical model was compared and validated with experimental data obtained with a solar Absorption Chiller. The calculated results agree well with experimental data. Simulations based on experimental data were used to predict the temperature and concentration profiles in each heat exchanger. A parametric study was conducted to investigate the effect of evaporator and desorber temperature on the Absorption Chiller's performance. The COP decreases by 25% with a decrease of 10°C in evaporator temperature and the COP increases by 4% with an increase of 10°C in desorber temperature. © 2013 Elsevier Ltd.

  • experimental study of an ammonia water Absorption Chiller
    International Journal of Refrigeration-revue Internationale Du Froid, 2012
    Co-Authors: Brice Le Lostec, Nicolas Galanis, Jocelyn Millette
    Abstract:

    Abstract This paper presents the performance of an ammonia-water Absorption Chiller. This single-stage 10 kW Absorption Chiller is cooled with a water-ethylene glycol solution. The required heat source is hot water between 75 °C and 85 °C. Different operating conditions can be imposed by varying temperatures and flow rates of secondary circuits and the flow of the rich solution. This equipment, designed for solar air conditioning applications, was tested under various operating conditions to assess its performance. This study shows that the performance of the Absorption Chiller decreases significantly with the evaporator temperature. This is due to a problem of partial evaporation in the evaporator when the Absorption machine is operated outside its design specifications. Cooling capacity oscillations, caused by refrigerant expansion control, were also observed. Absorption Chiller performance is also influenced by heat source temperature, cooling temperatures and flow of the rich solution.

  • Experimental study of an ammonia-water Absorption Chiller
    International Journal of Refrigeration, 2012
    Co-Authors: Brice Le Lostec, Nicolas Galanis, Jocelyn Millette
    Abstract:

    This paper presents the performance of an ammonia-water Absorption Chiller. This single-stage 10 kW Absorption Chiller is cooled with a water-ethylene glycol solution. The required heat source is hot water between 75 °C and 85 °C. Different operating conditions can be imposed by varying temperatures and flow rates of secondary circuits and the flow of the rich solution. This equipment, designed for solar air conditioning applications, was tested under various operating conditions to assess its performance. This study shows that the performance of the Absorption Chiller decreases significantly with the evaporator temperature. This is due to a problem of partial evaporation in the evaporator when the Absorption machine is operated outside its design specifications. Cooling capacity oscillations, caused by refrigerant expansion control, were also observed. Absorption Chiller performance is also influenced by heat source temperature, cooling temperatures and flow of the rich solution. © 2012 Elsevier Ltd and IIR. All rights reserved.

Dapeng Hu - One of the best experts on this subject based on the ideXlab platform.

  • performance simulation of the Absorption Chiller using water and ionic liquid 1 ethyl 3 methylimidazolium dimethylphosphate as the working pair
    Applied Thermal Engineering, 2011
    Co-Authors: Xiaodong Zhang, Dapeng Hu
    Abstract:

    Abstract The thermodynamic performance of the Absorption Chiller using water and ionic liquid 1-ethyl-3-methylimidazolium dimethylphosphate ([EMIM][DMP]) as the working pair was simulated. In addition, the effects of evaporation temperature on the performance coefficient, COP, generation temperature, concentration of strong solution and flow rate ratio were also analyzed. At the same condensing and absorbing temperature, the simulating results indicated that the performance coefficient for the water + [EMIM][DMP] was lower than that for aqueous solution of lithium bromide (H2O + LiBr) but still higher than 0.7, while the generation temperature was lower than that for H2O + LiBr, which indicated that the working pair, water + [EMIM][DMP], was capable of being used as a novel working pair for the Absorption Chiller driven by lower temperature level waste heat or hot water generated by common solar collector.

  • Performance simulation of the Absorption Chiller using water and ionic liquid 1-ethyl-3-methylimidazolium dimethylphosphate as the working pair
    Applied Thermal Engineering, 2011
    Co-Authors: Xiaodong Zhang, Dapeng Hu
    Abstract:

    The thermodynamic performance of the Absorption Chiller using water and ionic liquid 1-ethyl-3-methylimidazolium dimethylphosphate ([EMIM][DMP]) as the working pair was simulated. In addition, the effects of evaporation temperature on the performance coefficient, COP, generation temperature, concentration of strong solution and flow rate ratio were also analyzed. At the same condensing and absorbing temperature, the simulating results indicated that the performance coefficient for the water + [EMIM][DMP] was lower than that for aqueous solution of lithium bromide (H2O + LiBr) but still higher than 0.7, while the generation temperature was lower than that for H2O + LiBr, which indicated that the working pair, water + [EMIM][DMP], was capable of being used as a novel working pair for the Absorption Chiller driven by lower temperature level waste heat or hot water generated by common solar collector. © 2011 Elsevier Ltd.

Brice Le Lostec - One of the best experts on this subject based on the ideXlab platform.

  • simulation of an ammonia water Absorption Chiller
    Renewable Energy, 2013
    Co-Authors: Brice Le Lostec, Nicolas Galanis, Jocelyn Millette
    Abstract:

    An increased interest in Absorption Chillers has been observed [1] because these systems can utilize solar, geothermal and biomass energy sources, but also because they are quiet, vibration-free, require little maintenance and are ecological [2]. Instead of a compressor system, which uses electricity, an Absorption cooling system, using renewable energy and kinds of waste heat energy, may be used for cooling. This paper presents the simulation of a single stage solar Absorption Chiller operating with an ammonia–water mixture under steady state conditions. This simulation is based on heat and mass balances for each component. The heat and mass transfers in the absorber, the condensation of binary vapor of ammonia–water in the condenser and a thermosyphon desorber placed under the purification column were modeled. The numerical model was compared and validated with experimental data obtained with a solar Absorption Chiller. The calculated results agree well with experimental data. Simulations based on experimental data were used to predict the temperature and concentration profiles in each heat exchanger. A parametric study was conducted to investigate the effect of evaporator and desorber temperature on the Absorption Chiller's performance. The COP decreases by 25% with a decrease of 10 °C in evaporator temperature and the COP increases by 4% with an increase of 10 °C in desorber temperature.

  • Simulation of an ammonia–water Absorption Chiller
    Renewable Energy, 2013
    Co-Authors: Brice Le Lostec, Nicolas Galanis, Jocelyn Millette
    Abstract:

    An increased interest in Absorption Chillers has been observed [1] because these systems can utilize solar, geothermal and biomass energy sources, but also because they are quiet, vibration-free, require little maintenance and are ecological [2]. Instead of a compressor system, which uses electricity, an Absorption cooling system, using renewable energy and kinds of waste heat energy, may be used for cooling. This paper presents the simulation of a single stage solar Absorption Chiller operating with an ammonia–water mixture under steady state conditions. This simulation is based on heat and mass balances for each component. The heat and mass transfers in the absorber, the condensation of binary vapor of ammonia–water in the condenser and a thermosyphon desorber placed under the purification column were modeled. The numerical model was compared and validated with experimental data obtained with a solar Absorption Chiller. The calculated results agree well with experimental data. Simulations based on experimental data were used to predict the temperature and concentration profiles in each heat exchanger. A parametric study was conducted to investigate the effect of evaporator and desorber temperature on the Absorption Chiller's performance. The COP decreases by 25% with a decrease of 10 °C in evaporator temperature and the COP increases by 4% with an increase of 10 °C in desorber temperature.

  • Simulation of an ammonia-water Absorption Chiller
    Renewable Energy, 2013
    Co-Authors: Brice Le Lostec, Nicolas Galanis, Jocelyn Millette
    Abstract:

    An increased interest in Absorption Chillers has been observed [1] because these systems can utilize solar, geothermal and biomass energy sources, but also because they are quiet, vibration-free, require little maintenance and are ecological [2]. Instead of a compressor system, which uses electricity, an Absorption cooling system, using renewable energy and kinds of waste heat energy, may be used for cooling. This paper presents the simulation of a single stage solar Absorption Chiller operating with an ammonia-water mixture under steady state conditions. This simulation is based on heat and mass balances for each component. The heat and mass transfers in the absorber, the condensation of binary vapor of ammonia-water in the condenser and a thermosyphon desorber placed under the purification column were modeled. The numerical model was compared and validated with experimental data obtained with a solar Absorption Chiller. The calculated results agree well with experimental data. Simulations based on experimental data were used to predict the temperature and concentration profiles in each heat exchanger. A parametric study was conducted to investigate the effect of evaporator and desorber temperature on the Absorption Chiller's performance. The COP decreases by 25% with a decrease of 10°C in evaporator temperature and the COP increases by 4% with an increase of 10°C in desorber temperature. © 2013 Elsevier Ltd.

  • experimental study of an ammonia water Absorption Chiller
    International Journal of Refrigeration-revue Internationale Du Froid, 2012
    Co-Authors: Brice Le Lostec, Nicolas Galanis, Jocelyn Millette
    Abstract:

    Abstract This paper presents the performance of an ammonia-water Absorption Chiller. This single-stage 10 kW Absorption Chiller is cooled with a water-ethylene glycol solution. The required heat source is hot water between 75 °C and 85 °C. Different operating conditions can be imposed by varying temperatures and flow rates of secondary circuits and the flow of the rich solution. This equipment, designed for solar air conditioning applications, was tested under various operating conditions to assess its performance. This study shows that the performance of the Absorption Chiller decreases significantly with the evaporator temperature. This is due to a problem of partial evaporation in the evaporator when the Absorption machine is operated outside its design specifications. Cooling capacity oscillations, caused by refrigerant expansion control, were also observed. Absorption Chiller performance is also influenced by heat source temperature, cooling temperatures and flow of the rich solution.

  • Experimental study of an ammonia-water Absorption Chiller
    International Journal of Refrigeration, 2012
    Co-Authors: Brice Le Lostec, Nicolas Galanis, Jocelyn Millette
    Abstract:

    This paper presents the performance of an ammonia-water Absorption Chiller. This single-stage 10 kW Absorption Chiller is cooled with a water-ethylene glycol solution. The required heat source is hot water between 75 °C and 85 °C. Different operating conditions can be imposed by varying temperatures and flow rates of secondary circuits and the flow of the rich solution. This equipment, designed for solar air conditioning applications, was tested under various operating conditions to assess its performance. This study shows that the performance of the Absorption Chiller decreases significantly with the evaporator temperature. This is due to a problem of partial evaporation in the evaporator when the Absorption machine is operated outside its design specifications. Cooling capacity oscillations, caused by refrigerant expansion control, were also observed. Absorption Chiller performance is also influenced by heat source temperature, cooling temperatures and flow of the rich solution. © 2012 Elsevier Ltd and IIR. All rights reserved.

Xiaodong Zhang - One of the best experts on this subject based on the ideXlab platform.

  • performance simulation of the Absorption Chiller using water and ionic liquid 1 ethyl 3 methylimidazolium dimethylphosphate as the working pair
    Applied Thermal Engineering, 2011
    Co-Authors: Xiaodong Zhang, Dapeng Hu
    Abstract:

    Abstract The thermodynamic performance of the Absorption Chiller using water and ionic liquid 1-ethyl-3-methylimidazolium dimethylphosphate ([EMIM][DMP]) as the working pair was simulated. In addition, the effects of evaporation temperature on the performance coefficient, COP, generation temperature, concentration of strong solution and flow rate ratio were also analyzed. At the same condensing and absorbing temperature, the simulating results indicated that the performance coefficient for the water + [EMIM][DMP] was lower than that for aqueous solution of lithium bromide (H2O + LiBr) but still higher than 0.7, while the generation temperature was lower than that for H2O + LiBr, which indicated that the working pair, water + [EMIM][DMP], was capable of being used as a novel working pair for the Absorption Chiller driven by lower temperature level waste heat or hot water generated by common solar collector.

  • Performance simulation of the Absorption Chiller using water and ionic liquid 1-ethyl-3-methylimidazolium dimethylphosphate as the working pair
    Applied Thermal Engineering, 2011
    Co-Authors: Xiaodong Zhang, Dapeng Hu
    Abstract:

    The thermodynamic performance of the Absorption Chiller using water and ionic liquid 1-ethyl-3-methylimidazolium dimethylphosphate ([EMIM][DMP]) as the working pair was simulated. In addition, the effects of evaporation temperature on the performance coefficient, COP, generation temperature, concentration of strong solution and flow rate ratio were also analyzed. At the same condensing and absorbing temperature, the simulating results indicated that the performance coefficient for the water + [EMIM][DMP] was lower than that for aqueous solution of lithium bromide (H2O + LiBr) but still higher than 0.7, while the generation temperature was lower than that for H2O + LiBr, which indicated that the working pair, water + [EMIM][DMP], was capable of being used as a novel working pair for the Absorption Chiller driven by lower temperature level waste heat or hot water generated by common solar collector. © 2011 Elsevier Ltd.

Marta Vallès - One of the best experts on this subject based on the ideXlab platform.

  • part load characteristics of a new ammonia lithium nitrate Absorption Chiller
    International Journal of Refrigeration-revue Internationale Du Froid, 2015
    Co-Authors: M Zamora, Mahmoud Bourouis, Alberto Coronas, Marta Vallès
    Abstract:

    Abstract A pre-industrial prototype of a new water-cooled ammonia/lithium nitrate Absorption Chiller was characterised at part-load operation mode. The Chiller was built using brazed plate heat exchangers in all its components, including the absorber and the generator. A test campaign was carried out varying the thermal load in the chilled water circuit and keeping the hot and cooling water temperatures constant. Part-load curves of the thermal and electrical coefficients of performance were obtained, plotted and compared with data from the literature on small capacity Absorption Chillers with conventional working pairs, namely ammonia/water and water/lithium bromide. The experimental results showed that to achieve a higher electrical coefficient of performance at part-load operation, it was much more convenient to use an ON-OFF control than to modify the hot water temperature. Furthermore, using a simple ON-OFF control strategy, the behaviour of the new Absorption Chiller was more agile and responded more quickly. The part-load curve of the electrical coefficient of performance was obtained by adjusting the experimental data to the shape of the curve proposed in the standard prEN-14825:2011 for air-to-water Chillers. The Cc coefficient was 0.7985 matching the value obtained dividing the remaining electrical consumption measured during the OFF half cycles by the total energy consumption generated.

  • Part-load characteristics of a new ammonia/lithium nitrate Absorption Chiller
    International Journal of Refrigeration, 2015
    Co-Authors: M Zamora, Mahmoud Bourouis, Alberto Coronas, Marta Vallès
    Abstract:

    A pre-industrial prototype of a new water-cooled ammonia/lithium nitrate Absorption Chiller was characterised at part-load operation mode. The Chiller was built using brazed plate heat exchangers in all its components, including the absorber and the generator. A test campaign was carried out varying the thermal load in the chilled water circuit and keeping the hot and cooling water temperatures constant. Part-load curves of the thermal and electrical coefficients of performance were obtained, plotted and compared with data from the literature on small capacity Absorption Chillers with conventional working pairs, namely ammonia/water and water/lithium bromide. The experimental results showed that to achieve a higher electrical coefficient of performance at part-load operation, it was much more convenient to use an ON-OFF control than to modify the hot water temperature. Furthermore, using a simple ON-OFF control strategy, the behaviour of the new Absorption Chiller was more agile and responded more quickly. The part-load curve of the electrical coefficient of performance was obtained by adjusting the experimental data to the shape of the curve proposed in the standard prEN-14511:2011 for air-to-water Chillers. The Cc coefficient was 0.7985 matching the value obtained dividing the remaining electrical consumption measured during the OFF half cycles by the total energy consumption generated.