A novel transcritical CO2 refrigeration cycle with two ejectors

被引：28

作者：

Cen, Jiwen ^{[1
]}

Liu, Pei ^{[1
]}

Jiang, Fangming ^{[1
]}

机构：

[1] Chinese Acad Sci, Key Lab Renewable Energy & Gas Hydrate, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China

来源：

INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID | 2012年 / 35卷 / 08期

基金：

中国国家自然科学基金;

关键词：

Carbon dioxide; R744; Transcritical cycle; Ejectors; Modeling; COP; SYSTEM; OPTIMIZATION; EXPANDER;

D O I：

10.1016/j.ijrefrig.2012.07.001

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In recent years, CO2 is being revisited as a fully environmentally friendly and safe refrigerant. However, basic CO2 transcritical refrigeration cycle suffers from large expansion loss due to high pressure difference between gas cooler and evaporator. Then, it is crucial to find effective and economic way to reduce the expansion loss. Here, a novel cycle with two ejectors is proposed for the first time. Compared with conventional ejector-expansion CO2 cycle with only one ejector, this novel cycle with two ejectors is able to recover more expansion loss, thus improving the system performance further. A computational model is designed to simulate the double ejector CO2 cycle. Simulation results show its high system COP. Effects of parameters, such as ejector nozzle efficiency, gas cooler pressure, entrainment ratios of the two ejectors, gas cooler outlet temperature, on the cycle performance are also analyzed by using the computational model. (C) 2012 Elsevier Ltd and IIR. All rights reserved.

引用

页码：2233 / 2239

页数：7

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