两种中高温热泵自然工质实验研究

EXPERIMENTAL RESEARCH ON TWO NATURAL WORKING FLUIDS OF MODERATELY HIGH TEMPERATURE HEAT PUMP

以筛选适合中高温热泵工况,环境性能优良的自然工质为目标,在理论循环分析基础上,采用指定工质侧参数的循环性能对比实验评价研究方法,在水-水蒸气压缩式热泵实验台上,对理论循环性能优良、样品可得的自然工质HC600(丁烷)、HC600a(异丁烷),在蒸发温度为30～50℃,冷凝温度为60～95℃范围进行实验研究。研究结果表明,两种自然工质中高温热泵循环性能优良,两者在较低温度工况循环性能差别不大,在较高温度工况HC600的循环性能优于HC600a,在蒸发温度为44℃,冷凝温度为90℃时,丁烷和异丁烷COP分别为3.84和3.33,但两种工质的可燃性应引起足够重视。

The aim of experimental research is to screen out excellent working fluids which can adapt to the conditions of the moderately high temperature heat pump cycle and have excellent environmental characteristics. Experimental research of performance was based on the theoretical cycle analysis methodology and used method of specif- ying working fluid parameters. They were carried out on HC600 （butane） and HC600a （isobutane） which have excellent cycle performances and can be bought, based on a water-to-water heat pump system in the condensing temperature range of 60-95℃ and the evaporation temperature from 30 to 50℃. The results indicated that both the natural working fluids have excellent cycle performances in the moderately high temperature heat pump cycle. Their cycle performances have little difference in the conditions of low temperature cycle, but in higher temperature conditions the cycle performance of HC600 is better than HC600a. When the evaporation temperature is 44℃ and condensing temperature is 90℃, the COPh of HC600 is 3.84 while the COPh of HC600a is 3.33. But the flammability of the two working fluids should be paid great attention.