夏季冷热联供模式下的燃气机热泵机组性能分析

Experimental Evaluation of a Gas Engine-driven Heat Pump System for Cooling and Domestic Hot Water

本文建立了一套以R134a为制冷剂工质、以天然气为一次能源驱动开启式压缩机做功的燃气机热泵系统,研究了当蒸发器进水温度为12～22℃,室外环境温度为24.2～35.6℃,发动机转速为1 400～2 000 r/min,夏季冷热联供模式时,空气源燃气机热泵(GEHP)机组的性能。结果表明:发动机转速和蒸发器进水温度的变化对系统性能的影响大于室外环境温度变化的影响。随着发动机转速由1 400 r/min增至2 000 r/min,系统COP_1、COP_2、PER_1、PER_2分别减小了15.5%、9.9%、18.8%、13.5%。在工况范围内,机组冷水出水温度可达6.7～19.3℃,热水出水温度可达40.7～61.7℃,考虑余热回收情况下系统PER_2可达1.14～1.45。

This paper establishes a set of gas？engine heat pump（GEHP） experimental systems with R134a as the refrigerant and naturalgas as the primary energy source to drive the open compressor. The performance of a GEHP with cooling and hot water supply were testedwith evaporator water inlet temperatures ranging from 12 - 22 ℃, ambient air temperature ranging from 24.2 - 35. 6 ℃, and gas enginespeeds ranging from 1 400 - 2 000 r / min. The results show that the effects of evaporator water inlet temperature and gas engine speed onthe system performance were more significant than those of ambient air temperatures. As gas engine speed varies from 1 400 r / min to2 000 r / min, the COP1 , COP2 , PER1 , and PER2 of the system increases by 15. 5%, 9.9%, 18.8%, and 13. 5%, respectively. Within the range of working conditions, the average cooling water outlet temperature can reach 6. 7 - 19. 3 ℃, the average hot water outlet tem？peratures can reach 40. 7 - 61. 7 ℃, and the primary energy ratio （PER2 ） of GEHP system can reach 1. 14 - 1.45 considering heat re？covery.