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本文基于热导式量热仪的量热原理,引入惰性气体进行压力平衡,搭建了一个可以应用于宽温区不同压力下制冷剂比定压热容测量的系统。在该系统上,选择苯和R22在305 K到340 K温区内进行验证实验,所得的实验结果与文献报道的最大偏差分别不超过2.08%和2.31%。该系统结构简单,结果可靠,且能够适用于液态混合工质的高精度比定压热容测量。
Based on the calorimetry principle of the calorimeter, an inert gas is introduced into the pressure balance system to build a system that can be used to measure the specific heat capacity of refrigerant at different pressures in a wide temperature range. In this system, benzene and R22 were selected to carry out the verification experiment in the 305 K to 340 K temperature range, and the maximum deviation from the reported results was less than 2.08% and 2.31% respectively. The system has the advantages of simple structure and reliable results, and can be applied to the high-precision and constant-pressure heat capacity measurement of liquid mixed working medium.