混合制冷剂HFC152a/HFC125的电冰箱实验研究

对环保节能制冷剂——二元近共沸混合工质 HFC1 5 2 a/HFC1 2 5在电冰箱上应用的制冷循环性能进行了详细的理论计算和分析 ,并且对该工质灌注式替代 CFC1 2和 HFC1 5 2 a/HCFC2 2在不同配比和充灌量下的电冰箱主要制冷性能进行了实验研究。实验结果表明 :在合适的配比和充灌量下电冰箱制冷性能指标满足国家标准要求。混合制冷剂 HFC1 5 2 a/HFC1 2 5优良的环保性能和冰箱制冷性能使它完全适合做新一代的冰箱制冷剂。

Presence of Contaminants in Refrigerant and Their Effect on Refrigeration Cycle

Refrigerant is a medium used in refrigeration cycle. Until now in thermodynamic models calculations of refrigerant is not considered with lubricant and moist air but as an ideal pure gas （without any contaminants）. This is also the case in refrigeration cycle where the refrigerant is very often considered as an ideal one. Lubricant, air and water vapour are not considered in thermodynamic calculations in spite of their existence. The problems in the existing research are summarized. A further study is suggested on refrigerant systems. This circulation of such calculations is at the origin of a deviation from a theoretical behaviour. This article aims at reviewing the researches of oil-refrigerant, air-refrigerant, moist air-refrigerant or oil-moist air-refrigerant mixtures and focuses particularly on mixture enthalpy calculation. This paper deals with the description of the real mixture of refrigerant and contaminants （lubricant, water, moist air and other remains of refrigerants at elevated pressures and temperatures） which flow in a refrigerating cycle and the main point of this paper is to appoint thermodynamic parameters of such a mixture using the thermodynamic formulas.

室温磁致冷的仿真与分析

室温磁致冷技术尚处于样机研制阶段,仿真分析可以简化该过程。借助有限元分析工具计算磁场分布,并将工质细化然后结合磁工质材料磁热特性计算工质微元完整循环中的热量变化,最后求和近似得到磁致冷装置的整体运行特性。针对一种简化室温磁致冷原理样机的Ericsson循环制冷过程进行详细的计算。仿真结果表明提高循环的制冷温跨可增大总回热量,但是制冷效率将会降低。该方法有助于综合评定室温磁致冷装置的设计效果、指导室温磁致冷机的研制过程。