An experimental evaluation of the transcritical CO2 refrigerator performances using an internal heat exchanger.
An experimental evaluation of the transcritical CO2 refrigerator performances using an internal heat exchanger.
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DOI：
10.1016/j.ijrefrig.2007.12.016
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发表时间：
2008-09
期刊：
影响因子：
--
通讯作者：
C. Aprea;A. Maiorino
中科院分区：
文献类型：
--
作者：
C. Aprea;A. Maiorino
作为蒸汽压缩厂工作流体的经典物质，如氟氯烃，由于其潜在的臭氧消耗和温室效应，必须用新物质取代。二氧化碳（CO2）无毒，不易燃，作为制冷剂具有零臭氧消耗潜势和可忽略的全球变暖潜势。参考跨临界二氧化碳循环作为经典的“分体式系统”在住宅应用中冷却空气，本文的目的是评估使用内部热交换器的能源性能。实验装置采用半封闭压缩机、板式翅片管式换热器、电控背压阀和膨胀阀。此外，由于与逆变器相连的另一个半封闭压缩机，可以控制在液体接收器中产生的闪光气体。采用内热交换器可以提高性能系数。讨论了带内换热器和不带内换热器两个循环的性能系数的比较。
The classical substances as hydrochlorofluorocarbons (HCFCs) used as working fluids in the vapour compression plants have to be replaced by new substances because of their ozone depletion potential and their greenhouse effect. Carbon dioxide (CO2) is non-toxic, non-flammable, has zero ozone depletion potential and negligible global warming potential as refrigerant. Referring to a transcritical CO2cycle working as a classical “split-system” to cool air in residential applications, the aim of this paper is the evaluation of the energy performances using an internal heat exchanger. The experimental plant employs a semi-hermetic compressor, plate-finned tube type heat exchangers, a back pressure valve electronically controlled and an expansion valve. Besides it is possible to control the flash gas produced in the liquid receiver thanks to another semi-hermetic compressor linked to an inverter. An increase of the coefficient of performance has been found using the internal heat exchanger. The comparison of the coefficients of performance of two cycles, working with and without the internal heat exchanger, is discussed.