High-Temperature Adiabatic Calorimeter for Constant-Volume Heat Capacity Measurements of Compressed Gases and Liquids

摘要

A high-temperature adiabatic calorimeter has been developed to measure the con-stant-volume specific heat capacities(Cv) of both gases and liquids,especially fluids of interest to emerging energy technologies.The chief design feature is its nearly identical twin bomb arrangement,which allows accurate measurement of energy differences without large corrections for energy losses due to thermal radiation fluxes.Operating conditions for the calorimeter cover a range of temperatures from 250 K to 700k and at pressures up to 20 MPa.Performance tests were made with a sample of twic-distilled water.Heat capacities for water were measured from 300k to 420 k at pressures to 20 MPa.The measured heat capcities differed from those calculated with an independently developed standard reference formulation with a root-mean-square fractional deviation of 0.48%