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在过去的十年中人们十分关注替代氟氯烷(R12)制冷剂的研究,理论上已经揭示了可以为保护大气层上部使臭氧层不致严重消耗作出贡献的可能性。这就是“可保护同温层安全”新的制冷剂——四氟乙烷(R·134a),它的热力学性质与R—12相似,并且它被认为是R—12在空调和冰箱应用中具有潜力的直接的替代品。 本文提出了R—134a的p—V—T,饱和蒸汽压力、液体密度,理想气体热容量以及临界参数等热力学数据。另外,将热力学数据关联成状态方程,通过状态方程再计算出熵与焓。采用合适的计算方法,开发了一个Fortran计算机硬件包,据此建立了一个大的温度、压力范围内的热力性质图。
In the past decade, much attention has been devoted to the research of alternatives to HCFC (R12) refrigerants, which have theoretically revealed the possibility of contributing to the protection of the upper atmosphere from the severe depletion of the ozone layer. This is the new refrigerant, Tetrafluoroethane (R · 134a), which “protects stratosphere.” Its thermodynamic properties are similar to those of R-12, and it is considered as R-12 in air conditioning and refrigerator applications Promising direct alternatives. This paper presents the thermodynamic data of p-V-T, saturated vapor pressure, liquid density, ideal gas heat capacity and critical parameters of R-134a. In addition, the thermodynamic data is related to the state equation, and then the entropy and enthalpy are calculated through the state equation. Using a suitable calculation method, a Fortran computer hardware package was developed, which established a map of the thermodynamic properties over a wide temperature and pressure range.