Comparisons of different working pairs and cycles on the performance of absorption heat pump for heating and domestic hot water in cold regions

Abstract In order to explore the suitable working pair and cycle style for heating and domestic hot water in cold region, single-stage and double-stage air source absorption heat pump (ASAHP) and ground source absorption heat pump (GSAHP) are modeled in this paper. Based on these models, the performance of absorption heat pump (AHP) at different generating temperatures, evaporating temperatures and condensing temperatures is simulated respectively when using NH3–H2O, NH3–LiNO3 and NH3–NaSCN as working fluid. The results indicate that NH3–LiNO3 requires lower generating temperature, and at the same time can work at lower evaporating temperature and higher condensing temperature than other solutions for the same heat pump cycle. Besides, the double-stage AHP is advantageous over single-stage AHP in utilizing low temperature driving source, operating in very cold climate and producing higher temperature hot water. Finally, combining the simulated performance with required hot water temperature and climate conditions, the applicability of different AHP cycles (single-stage or double-stage), heat sources (air source or ground source) and working pairs (NH3–H2O, NH3–LiNO3 or NH3–NaSCN) is analyzed in different regions respectively.

[1]  J. Paris,et al.  A model for analysis and design of H2O–LiBr absorption heat pumps , 2011 .

[2]  Tao Yang,et al.  Experimental study of a solar-assisted ground-coupled heat pump system with solar seasonal thermal storage in severe cold areas , 2010 .

[3]  Reinhard Radermacher,et al.  Absorption Chillers and Heat Pumps , 1996 .

[4]  M. Izquierdo,et al.  An innovative solar-driven directly air-cooled LiBr–H2O absorption chiller prototype for residential use , 2012 .

[5]  Wenxing Shi,et al.  Energy saving potential of low temperature hot water system based on air source absorption heat pump , 2012 .

[6]  Omer Kaynakli,et al.  A simulation study of performance evaluation of single-stage absorption refrigeration system using conventional working fluids and alternatives , 2010 .

[7]  Shenyi Wu,et al.  Innovations in vapour-absorption cycles , 2000 .

[8]  Wilfrido Rivera,et al.  Modeling of an intermittent solar absorption refrigeration system operating with ammonia–lithium nitrate mixture , 2003 .

[9]  Da-Wen Sun,et al.  Comparison of the performances of NH3-H2O, NH3-LiNO3 and NH3-NaSCN absorption refrigeration systems , 1998 .

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

[11]  S. Chungpaibulpatana,et al.  A review of absorption refrigeration technologies , 2001 .

[12]  A. Yokozeki,et al.  Theoretical performances of various refrigerant-absorbent pairs in a vapor-absorption refrigeration cycle by the use of equations of state , 2005 .

[13]  Sture Holmberg,et al.  Flow patterns and thermal comfort in a room with panel, floor and wall heating , 2008 .

[14]  Pradeep Bansal,et al.  Energy consumption modeling of air source electric heat pump water heaters , 2010 .

[15]  E. D. Rogdakis,et al.  Performance of solar-driven ammonia-lithium nitrate and ammonia—sodium thiocyanate absorption systems operating as coolers or heat pumps in Athens , 1996 .

[16]  Alberto Coronas,et al.  Double-lift absorption refrigeration cycles driven by low-temperature heat sources using organic fluid mixtures as working pairs , 2001 .

[17]  Katsunori Nagano,et al.  Development of a design and performance prediction tool for the ground source heat pump system , 2006 .

[18]  Zhihao Chen,et al.  Simulation and experiment on the thermal performance of U-vertical ground coupled heat exchanger , 2006 .

[19]  Xiaosong Zhang,et al.  A calculation method for the floor surface temperature in radiant floor system , 2010 .

[20]  C. A. Infante Ferreira,et al.  Thermodynamic and physical property data equations for ammonia-lithium nitrate and ammonia-sodium thiocyanate solutions , 1984 .

[21]  M. Venegas,et al.  Thermodynamic study of multistage absorption cycles using low‐temperature heat , 2002 .