フローカロリメータによる冷媒 HCFO-1224yd(Z)の定圧比熱計測

抄録

We measured isobaric heat-capacities of liquid HCFO-1224yd(Z) by using a flow-calorimeter. Our group constructed the flow-calorimeter in 1986 for measuring specific-heat-capacity at constant pressure of HFC liquid refrigerants. Isobaric-heat-capacity measurement was applied to liquid HCFO-1224yd(Z), that is expected to be an alternative working-fluid to R245fa. HCFO-1224yd(Z) has a smaller value than 1/100 Global Warming Potential of R245fa. The heat capacity of R245fa was also measured by our group in 2015. The measurements for HCFO-1224yd(Z) are obtained at eleven state-points under a pressure of 500 kPa in a temperature range from 278 K to 323 K. The expanded uncertainty (coverage factor of k = 2) for heat capacity values is predicted as being from 0.38 % to 0.85 %.