高温高压下湿空气的焓和熵计算

本文以湿空气透平和压缩空气储能系统中的工质-湿空气为研究对象,运用所提出的一个适合计算高温高压湿空气热力学性质的对应态维里方程,对湿空气的偏差焓和偏差熵进行了计算.在湿度0≤ W≤1 kg/kg(A),温度小于573.15 K,压力小于5 MPa时,与ASHRAE用的多项式维里方程计算得到的偏差焓和偏差熵进行了比较,误差很小.用这个对应态维里方程外推计算了温度和压力分别达到600 K和15 MPa的湿空气焓和熵.计算结果表明对湿空气而言压力和湿度越大,偏差焓和偏差熵越大;温度越高,偏差焓和偏差熵越小.

THE CALCULATIONS OF MOIST AIR'S ENTHALPY AND ENTROPY IN HIGH TEMPERATURE AND PRESSURE

Because moist air at high temperature and pressure is currently used in the moist air turbine and compressed air energy storage,the thermodynamic properties of moist air are investigated by using a proposed-newly corresponding-states-virial state equation.In range of temperature less than 573.15 K,pressure less than 5 MPa and humidity ratios from 0.0 to 1.0 kg/kg,the calculated results of departure enthalpy and departure entropy of moist air are in well agreement with the data offered by ASHER research project.The enthalpy and entropy of moist air can be calculated by extrapolating this new equation under the condition of temperature up to 600 K and pressure up to 15 MPa.When pressure and humidity ratios of moist air increase,departure enthalpy and departure entropy will increase too.But temperature of moist air increases,departure enthalpy and departure entropy of moist air will decrease.