フローカロリーメーターを用いたR 134aおよび二酸化炭素の気相域における定圧比熱の測定(熱工学,内燃機関,動力など)

概要

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By using a flow calorimeter, the speific isobaric heat capacity (c_p) was measured for R 134a (1,1,1,2-tetrafluoroethane) in the gas phase. Seven measurements for R 134a were obtained at temperatures from 323 to 343K and at pressures from 1.0 to 1.8MPa. Some of them are close to the saturation curve. The expanded uncertainty (k=2) of the temperature measurements is estimated to be less than 18mK, and that of the pressure measurements is less than 6.6kPa. The expanded uncertainty for c_p is estimated to range from 13 to 26J・kg^<-1>・K^<-1>. Also, five measurements for carbon dioxide were obtained from 315 to 333K and from 2.0 to 2.5MPa by a modification of the apparatus. The expanded uncertainty (k=2) of the temperature measurements is estimated to be less than 87mK, and that of the pressure measurements is less than 16kPa. The expanded uncertainty for c_p is estimated to range from 45 to 63J・kg^<-1>・K^<-1>. The experimental data of R 134a and carbon dioxide were discussed in terms of available equations of state.
社団法人日本機械学会の論文
2009-07-25