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为保护臭氧层，《蒙特利尔议定书》规定ＣＦＣ－１２为首批禁用物质，因此，寻找其替代物的工作日益紧迫。针对目前各种替代物的不足之处，运用多目标决策分析方法，筛选出一种新的绿色环保制冷剂“清华２号”（ＴＨＲ０２），其热物理性能和循环参数与ＣＦＣ－１２非常接近，并进行了压缩机、润滑油和冰箱的性能试验以及循环的变工况模拟分析。结果表明ＴＨＲ０２具有以下特点：不破坏臭氧层，温室效应低，不燃无毒，适用于原制冷系统、压缩机与冷冻油，热工性能好，可直接灌注，长期替代ＣＦＣ－１２，且可进一步替代ＨＦＣ－１３４ａ。
To protect the ozone layer, CFC-12 is the first banned substance under the Montreal Protocol and the search for alternatives is therefore becoming more urgent. Aiming at the shortcomings of various substitutes, a new green refrigerating agent named “Tsinghua No.2” (THR02) was screened out by using multi-objective decision analysis method. The thermophysical properties and cycle parameters were very close to those of CFC-12 , And carried out compressor, lubricating oil and refrigerator performance test as well as the cyclic simulation of change conditions. The results show that THR02 has the following characteristics: no damage to the ozone layer, low greenhouse effect, non-flammable and non-toxic, suitable for the original refrigeration system, compressor and refrigeration oil, good thermal performance, direct perfusion and long-term replacement of CFC- HFC-134a.