Abstract: Discussions were made on the fairness issue in experimentally assessing the cycle performances of various working fluids for refrigeration, air-conditioning, and heat pump systems with an experimental apparatus of a constant-speed compressor and fixed area heat exchangers.The additional temperature difference(Δt_plus),the partial heat transfer temperature difference，was identified to compare the working fluids at the same heat load to corrected area ratios in the evaporator and condenser respectively,and the equations for calculating Δt_plus and the thermodynamic perfection of the cycle (ε) were given.By adopting Δt_plus and ε,two modified experimentally assessing approaches were developed with much improved fairness and easy steps to operate.

摘要： 以制冷空调热泵系统中CFCs、HCFCs工质替代研究为背景，对客观比较不同工质循环性能的实验评价方法进行了探讨.提出了两种引入附加温差(Δt_plus)和循环热力学完善度(ε)的改进型实验评价方式;给出了Δt_plus的概念、量化关系式和ε的计算方法.改进型的实验评价方式不仅在测量的公平性、评价的全面性上较原方式明显改进，还具有较好的可操作性.