Second law analysis of two-stage compression transcritical CO2 heat pump cycle

被引:11
作者
Oezguer, Arif Emre [1 ]
Bayrakci, Hilmi Cenk [2 ]
机构
[1] Suleyman Demirel Univ, Tech Educ Fac, Mech Educ Dept, TR-32260 Isparta, Turkey
[2] Suleyman Demirel Univ, HVAC Dept, Senirkent Vocat Sch, TR-32600 Senirkent Isparta, Turkey
关键词
CO2; two stages; transcritical; refrigeration; inter-stage pressure; second law;
D O I
10.1002/er.1415
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Because of the global warming impact of hydro fluorocarbons, the uses of natural refrigerants in automotive and HVAC industries have received worldwide attention. CO2 is the most promising refrigerant in these industries, especially the transcritical CO2 refrigeration cycle. The objective of this work is to identify the main factors that affect two-stage compression transcritical CO2 system efficiency. A second law of thermodynamic analysis on the entire two-stage CO2 cycle is conducted so that the exergy destruction of each system component can be deduced and ranked, allowing future efforts to focus on improving the components that have the highest potential for advancement. The inter-stage pressure is used as a variable parameter in the analysis study. The second law efficiency, coefficient of cooling performance and total exergy destruction of the system variations with the inter-stage pressure are presented graphically. It was concluded that there is an optimum inter-stage pressure that maximizes both first law and second law efficiencies. Copyright (c) 2008 John Wiley & Sons, Ltd.
引用
收藏
页码:1202 / 1209
页数:8
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