Abstract: A flow apparatus for measuring heat of vaporization of liquids under pressure up to 6 MPa,and temperature from 260 K to 480 K is developed.Heats of vaporization of water are measured,and the differences of our experimental results with literature values are within 0.85%.The heats of vaporization HFC134a and HFC125 used as the alternatives of refrigerant Freon are determined, and 14 values of heat of vaporization are reported in this paper.

摘要： 建立了流动型量热法汽化热测量装置 .该装置测量压力可达 6MPa ,温度范围 2 6 0～ 480K .以所建的装置测量了纯水的汽化热 ,测量结果与文献值比较其偏差在± 0 .85 %以内 ,证明了实验装置的可靠性 .利用该装置测量了制冷剂的替代工质HFC134a和HFC12 5的汽化热 ,为替代工质的筛选和工程设计提供了可靠的基础数据