Experimental study on characteristics of transcritical heat pump water heater using refrigerant HFC125  

HFC125跨临界热泵热水器性能实验研究(英文)

作　　者：王方[1,2] 连之伟[1,2] 范晓伟[2] 王凤坤[2] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]中原工学院能源与环境学院,郑州450007

出　　处：《Journal of Southeast University(English Edition)》2010年第2期182-186,共5页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.50676059)

摘　　要：To evaluate the performance of heat pumps using refrigerant HFC125,an experimental rig of a DC-inverter heat pump water heater is designed and set up,and the research on the transcritical heat pump water heater is carried out experimentally.It is found that there is a top value of the coefficient of performance（COP）when the system runs at 95 Hz of frequency.The relationships between the COP and compressor frequency,condensation pressure,evaporation pressure,condensation water temperature rise,and discharge temperature are discussed and analyzed at 95 Hz.And the COP of the HFC125 transcritical cycle is also compared with that of a R410 subcritical heat pump under the same conditions.The results indicate that there exists an optimum frequency for a better COP,and the system COP shows an increasing tendency with the decrease in condensation pressure and compressor ratio while the evaporation pressure remains invariant,and the COP decreases rapidly when cooling water temperature rises over 47.5 ℃.Compared with the R410A sub-critical cycle,the COP of HFC125 transcritical cycle significantly increases by 12% on average.为深入了解HFC125跨临界循环热泵热水器的运行特性,设计和建造了一个直流变频热泵热水器实验装置,对HFC125跨临界循环热泵热水器性能进行了实验研究,发现压缩机运行在95Hz时系统存在一个COP峰值.然后以95Hz为例,研究了系统COP与压缩机频率、冷凝压力、蒸发压力、冷却水温升、压缩机排气温度等参数的关系,并与R410A亚临界循环系统性能进行了比较.结果表明:系统存在一最优频率,此时系统有较好的COP值,系统COP随冷凝压力和压比的降低呈上升趋势,而蒸发压力基本恒定;当冷却水温升超过47.5℃时,COP迅速下降.相对R410A亚临界循环,HFC125跨临界循环系统COP显著提升,提高幅度平均在12%以上.

关 键 词：HFC125 transcritical cycle heat pump water heater coefficient of performance（COP） 

分 类 号：TK172[动力工程及工程热物理—热能工程]