Heat Capacities of Refrigerant Mixture under High Pressure

Burnett(1905)首先提出使用换热器来获得热容比。1930年，沃克曼用这种方法报道了气体的热容。我们根据换热器法研制了一种新的高压混合制冷剂热容测量装置。为了验证该装置的可靠性，测量了298~343K温度范围内的二氧化碳比热容，压力最高可达1.6 Mpa。将得到的二氧化碳热容比与文献值进行了比较。得到的数据与文献值在该测量的估计不确定度上是一致的。不幸的是，在较高压力下的测量出现了一些问题。其中一个问题是换热器的压力泄漏，换热器是该装置中最重要的部件。因此，这里不能报告氢氟烃混合物的结果。这些问题已经解决了。将尽快测量丢失的氢氟烃混合物数据。

The use of a heat exchanger for obtaining heat capacity ratios was first proposed by Burnett(1905). In 1930 Workman reported the heat capacity of gases by this method. We have developed newly designed apparatus based on the heat exchanger method for the measurement of heat capacities of refrigerant mixtures under high pressure. In order to confirm the reliability of our apparatus, the specific heat capacities of carbon dioxide were measured in the temperature range of 298 to 343 K at pressures up to 1.6 MPa. The heat capacity ratios of carbon dioxide obtained in this work were compared with the literature values. The data obtained agreed with the literature values in the estimated uncertainties of this measurements. Unfortunately, some problems occurred with the measurement at higher pressures. One problem is the pressure leak at the heat exchanger which is the most important part in this apparatus. Therefore, no results for the mixture of Hydrofluoro carbons can be reported here. These problems were already solved. The missing data for the mixtures of Hydrofluoro carbons will be measured as soon as possible.