高温高压水比定压热容的实验测量

Measurement of Isobaric Heat Capacity for Pure Water at High Temperature and High Pressure

本文基于流动型量热法建立了一套适用于测量高温高压下比定压热容的实验系统,通过改进传统流动型量热器的管路布置及合理的系统结构设计,使该系统温度、压力适用范围为:293~673 K、0.1~30 MPa。该实验系统温度、压力、比定压热容的测量不确定度分别小于土0.05 K、士13 kPa、:±0.98%。为了验证实验系统的测量精度和可靠性,测量了温度为296~313 K、压力为0.1~6 MPa范围内纯水的比定压热容,与文献值的相对偏差小于1%。本文还对温度在355~666K、压力在1~23 MPa范围内的高温高压水的比定压热容进行了测量。

A flow calorimeter is developed to measure the isobaric heat capacities of fluid at high temperature and high pressure,which can be used to determine the isobaric heat capacities of fluid in the temperature range from 293 K to 673 K up to 30 MPa.The total uncertainties of temperature,pressure and isobaric heat capacity are estimated to be less than ?.05 K,?3 kPa and ?.98%respectively.The isobaric heat capacities for pure water are measured in the temperature range from296 to 313 K up to 6 MPa,the experimental results are compared with literature data to check the reliability of the calorimeter,and the relative deviation is less than 1%.This work presents the isobaric heat capacities for pure water in the temperature range from 355 to 666 K up to 23 MPa.