Experimental studies on air-cooled NH3-H2O based modified GAX absorption cooling system.

Abstract An experimental investigation on the performance of an air-cooled modified generator absorber heat exchange (GAX) absorption cooling system has been carried out and presented in this paper. The conventional system is modified by incorporating high pressure GAX, low pressure GAX, a solution cooler and an additional solution heat exchanger to reduce the heat input to the system. The system is designed for a cooling capacity of 10.5 kW using ammonia–water (NH 3 –H 2 O) as the working fluid. The performance of the system in terms of the circulation ratio, internal heat recovery and coefficient of performance (COP) has been obtained. The system is capable of producing a low evaporator temperature of −5 °C, at a sink temperature of 35 °C, under no load conditions. The results indicate that at a generator and evaporator temperature of 120 °C and 2 °C respectively, the system delivers a maximum cooling capacity of about 9.5 kW with a fuel and total COP of 0.61 and 0.57 respectively.

[1]  Richard N. Christensen,et al.  Performance of a residential-sized GAX absorption chiller , 2001 .

[2]  S. C. Kim,et al.  Cycle analysis of an air-cooled LiBr/H2O absorption heat pump of parallel-flow type , 1994 .

[3]  S. Kurosawa,et al.  Development of air-cooled double-effect gas-fired absorption water chiller-heater , 1989 .

[4]  O. García-Valladares,et al.  Theoretical and experimental evaluation of an indirect-fired GAX cycle cooling system , 2008 .

[5]  N. Velázquez,et al.  Methodology for the energy analysis of an air cooled GAX absorption heat pump operated by natural gas and solar energy , 2002 .

[6]  C. P. Jawahar,et al.  Thermodynamic studies on NH3–H2O absorption cooling system using pinch point approach , 2010 .

[7]  Jorge E. Gonzalez,et al.  Simulation of an Air-Cooled Solar-Assisted Absorption Air Conditioning System , 2001 .

[8]  G. Grossman,et al.  A computer model for simulation of absorption systems in flexible and modular form , 1987 .

[9]  Yong Tae Kang,et al.  Review of advanced absorption cycles: performance improvement and temperature lift enhancement , 2000 .

[10]  F. A. Creswick,et al.  Simulation and performance analysis of an ammonia-water absorption heat pump based on the generator-absorber heat exchange (GAX) cycle , 1995 .

[11]  Siyoung Jeong,et al.  Thermodynamic design data and performance evaluation of the water + lithium bromide + lithium iodide + lithium nitrate + lithium chloride system for absorption chiller , 2000 .

[12]  Huen Lee,et al.  Performance evaluation of absorption chiller using LiBr+H2N(CH2)2OH+H2O, LiBr+HO(CH2)3OH+H2O, and LiBr+(HOCH2CH2)2NH+H2O as working fluids , 1999 .

[13]  O. García-Valladares,et al.  Experimental analysis of a transfer function for the transient response of an evaporator in an absorption refrigeration GAX system , 2010 .

[14]  Richard N. Christensen,et al.  Performance evaluation of a generator-absorber heat-exchange heat pump , 1996 .

[15]  Gershon Grossman,et al.  Comparative simulation and investigation of ammonia-water: absorption cycles for heat pump applications , 1997 .

[16]  Yong Tae Kang,et al.  An environmentally friendly GAX cycle for panel heating: PGAX cycle , 2000 .

[17]  Refrigerating.  ASHRAE handbook of fundamentals , 1967 .

[18]  Guangming Chen,et al.  Thermodynamic performance analysis of gas-fired air-cooled adiabatic absorption refrigeration systems , 2007 .

[19]  Da-Wen Sun,et al.  Thermodynamic design data and optimum design maps for absorption refrigeration systems , 1997 .

[20]  Jung-In Yoon,et al.  Cycle analysis of air-cooled absorption chiller using a new working solution , 1999 .

[21]  M. Venegas,et al.  Crystallization as a limit to develop solar air-cooled LiBr–H2O absorption systems using low-grade heat , 2004 .