Calculation and analysis on isobaric specific heat for refrigerants

Based on P-R equation of state and M-H81 equation of state with high accuracy,detailed calculation and analysis were made by utilizing residual function method.10 pure refrigerants and 4 mixing refrigerants were chosen and compared with experimental results.The calculation results show that in vapor-phase region,the estimation precision is about 3% for both models;while in liquidphase region,M-H81 EOS model is better than P-R EOS model with an estimation precision of less than 10%.M-H81 equation model is more appropriate than P-R equation model to make precise calculation within a broader temperature and pressure range.The study validates the feasibility of theoretical method,and can be a guideline for further study on other basic thermophysical properties.