In this paper,a flow calorimeter was developed for the measurement of isobaric specific heat capacity(cp)at low temperature.The calorimeter was composed of four parts:thermostatic bath,flow system,calorimeter and data acquisition system.The calorimeter can measure the cp in the temperature range of 115～340 K,and the pressure can reach 8 MPa.The uncertainty of temperature,pressure and heat capacity were 11 mK,0.02 MPa and 0.9％,respectively.The cp data of propane,isobutane,ethane and ethane+propane binary mixtures at low temperature were measured.The measured data showed a good agreement with the calculated values of high-precision Helmholtz equation of state.The average absolute relative deviations of propane,isobutane,ethane and ethane+propane was 0.26％,0.32％,0.31％and 0.38％,respectively,which verified the reliability of the device.
关键词
低温流动量热计/比定压热容/乙烷(R170)/丙烷(R290)/异丁烷(R600a)
Key words
low temperature flow calorimeter/isobaric specific heat capacity/ethane(R170)/propane(R290)/isobutane(R600a)
维普
万方数据