Measurements of isobaric heat capacity of R32

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• 作者：Noboru Kagawa^a ; ^{kagawa@nda.ac.jp} ; Atsushi Matsuguchi^a ; ^{matsu@nda.ac.jp} ; Kenichi Yamaya^a ; Koichi Watanabe^b ; ^{ttn8j8y233@mx9.ttcn.ne.jp}
• 关键词：Heat capacity ; R32 ; Gas ; Calorimeter
• 刊名：International Journal of Refrigeration
• 出版年：2012
• 期刊代码：92_01407007
• 类别：et
• 出版时间：June, 2012
• 卷：35
• 期：4
• 页码：1014-1020
• 文件大小：666 K

摘要

The specific isobaric heat capacity (c_p) was measured for R32 (difluoromethane) in the gas phase. Thirty-two measurements for R32 were obtained at temperatures from 274 to 353聽K and at pressures from 0.65 to 2.4聽MPa. Some of them are close to the saturation curve. The expanded uncertainty (k聽=聽2) of the temperature measurements is estimated to be less than 26聽mK, and that of the pressure measurements is less than 23聽kPa. The expanded uncertainty for c_p is estimated to range from 13 to 27聽J聽kg^鈭?聽K^鈭?. The experimental data were compared with available equations of state. These data will be essential for improving available models so as to represent more reliable thermodynamic properties of R32 and refrigerant mixtures with R32 that are used for refrigeration and air conditioning systems.