混合制冷工质蒸发潜热的推算研究

本文定义了新的用于推算混合制冷工质蒸发潜热的对比法则,发现了混合制冷工质蒸发潜热与其纯组分蒸发潜热的无量纲关系有同一化规律;另外,本文还寻找到利用纯组分的特征蒸发潜热拟合混合制冷工质特征蒸发潜热的关系式,以及使用个别数据点标定特征蒸发潜热的方法,进而给出了利用纯工质蒸发潜热计算混合制冷工质蒸发潜热的方程;本文比较了文献中5种二元和三元混合制冷工质的推算值与文献值,平均绝对偏差小于1.5%,精度满足工程应用需要.

PREDICTION OF THE LATENT HEAT OF REFRIGERANT MIXTURES

New corresponding temperature and corresponding heat of vaporization were defined.The relationship between corresponding heat of vaporization and corresponding temperature for refriger- ant mixtures accorded with that for pure-components.The characteristic heats of vaporization were calculated by the method to use heats of vaporization of pure-components and the calibration method, and the generalized equation was presented to calculate heat of vaporization of refrigerant mixtures. Finally,the calculated values by equation were compared with the values of literature for five ternary and binary refrigerant mixtures.Their average absolute deviation was less than 1.5% and the accuracy can meet the requirements of engineering applications.