CO_2蒸气固体颗粒制冷系统.pdfVIP

: 1006-2467( 2007) 03-0442-05 CO2 1, 2 1 2 黄冬平 , 丁国良 , QUACK Hans ( 1. , 200240; 2. , 01069) : 压缩式制冷装置通常利用液体汽化吸热来获 冷量, 由于CO2 在三相点- 56 以下时产 生固体, 故不能用它作为制冷剂来获 - 56 以下的低温环境. 提出一种利用CO2 蒸气固体颗粒 作为制冷剂的制冷系统, 可以以CO2 为工质获 三相点以下的温度. 在该系统中, 采用可调喷嘴 升华器高低压流量调节阀代替原系统中的蒸发器, 并对该系统进行了理论循环分析. 结果表明, 理想情况下该系统COP 比现有的制冷系统高约50% . : 二氧化碳; 固体颗粒; 制冷系统 : TB 664 : A New Ref rigerat ion System Using Vapo-r Solid CO2 as Refrigerant 1, 2 1 2 H UA N G Dong-p ing , DIN G Guo-liang , Q UA CK H ans ( 1. Inst. of Refrigeration and Cryogenics Eng . , Shanghai Jiaotong Univ . , Shanghai 200240, China; 2. Professorship of Refrigeration and Cryogenics, T echnical Univ. of Dresden, Dresden 01069, Germany) Abstract: CO2 can not be used as refrigerant in vapor-compression refrigeration system for temperature low er than - 56 , because refrigerant must be in liquid phase in vapor- compression refrigeration system, and solid CO2 w ill form under the triple point temperature - 56 . This paper put forw ard a refrigeration system w ith CO2 vapor-solid particles as refrigerant, by w hich the temperature low er than the triple point is achieved. In this system, an adjustable nozzle, sublimator, high-pressure regulating valve and low-pres- sure regulating valve are used to replace the conventional evaporator. T he theoretical cycle analysis of the refrigeration system show s that its COP is about 50% higher than that of the conventional one. Key words: carbon dioxide ( CO2) ; solid particle; refrigeration system : COP x dif s h , kJ/ kg z eva v P , W l