在作者在普渡大学的研究生学习过程中，有必要对常用制冷剂R12、R22和R502的热力学性质进行大量计算。由于这些计算最容易通过数字计算机获得，因此有必要对制冷剂的特性进行编程。本文介绍了制冷剂R12、R22和R502的热力学性质子程序。这些子程序可以很容易地合并到需要热力学性质值的计算机程序中。引文:ASHRAE交易，第77卷，第2部分，华盛顿特区

In the course of the authors' graduate study at Purdue University, it became necessary to perform numerous calculations involving the thermodynamic properties of the commonly used refrigerants R 12, R 22 and R 502. Since these calculations were most easily obtained using a digital computer, it was necessary to program the properties of the refrigerants.This paper presents thermodynamic property subprograms for refrigerants R 12, R 22 and R 502. These subprograms can be easily incorporated into computer programs where values for the thermodynamic properties are required.