实际气体的混合制冷效应及其应用探讨

THE MIXING EFFECTS OF REAL GASES AND ITS POSSIBLE APPLICATIONS TO REFRIGERATION

本文描述了等温和绝热混合的热力过程,并给出了绝热混合效应和等温混合效应的定义。首先以氮气和甲烷为例考察了相邻沸点物质的混合效应特性,以及温度、压力及摩尔比例等参数对混合效应的影响,并与其节流效应进行了比较。然后详细考察了7种具有不同沸点的物质与氦气在不同混合温度下的混合效应。结果表明高沸点物质在相变区间具有很大的正混合效应,在该区间可具有一定的制冷能力,并在此基础上探讨了应用混合制冷效应实现制冷的可能。

In this paper, the mixing processes of real gases were described; the definitions of the adiabatic and isothermal mixing effects to the mixing processes of real gases were given. First of all, nitrogen and methane were used to study their binary mixing effect at different pressures, temperatures, and compositions. Then, seven substances with different boiling-point temperatures were selected to study their mixing effects with helium, which shows that there is plus mixing effects at a large tempera ture range from their freezing points to ambient temperature. The results indicate that the maximum temperature variation occurs at the saturation state of each component in the mixing process. Those components with higher boiling-point temperatures have higher isothermal mixing effects. The possible applications of the mixing cooling effects to the closed cycle refrigeration systems were also discussed in this paper.