The substitution of R134a with R744: An exergetic analysis based on experimental data

被引：38
作者：
Aprea, Ciro [1 ]
Greco, Adriana [2 ]
Maiorino, Angelo [1 ]
机构：
[1] Univ Salerno, Dipartimento Ingn Ind, I-84084 Salerno, Italy
[2] Univ Naples Federico II, DETEC, I-80125 Naples, Italy
来源：
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID | 2013年 / 36卷 / 08期
关键词：
CO2; R134a; Transcritical cycle; E.xergetic analysis; Exergy loss; INTERNAL HEAT-EXCHANGER; CARBON-DIOXIDE CYCLE; REFRIGERATION CYCLE; EXPANSION DEVICE; SYSTEM-DESIGN; PRESSURE;
D O I：
10.1016/j.ijrefrig.2013.06.012
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
This paper deals with the problem of R314a substitution with a natural refrigerant fluid. A comparison is performed between R134a and R744 (CO2). R134a is a hydrofluorocarbon with a large direct warming impact (GWP), whereas the R744 contribution is negligible. A comparative exergetic analysis, carried out with experimental tests, has been presented. This paper compares a commercial R134a refrigeration plant and a prototype R744 system working in a trans-critical cycle. Based on the experimental data an exergetic analysis has been carried out on the overall plant and on each device. The overall exergetic performances of the classical vapour compression plant working with R134a are consistently better than that of R744 (from a minimum of 20 to a maximum of 44%). The performance of the individual components of the plant has been analyzed, in order to pinpoint those contributing most to the decrease in the exergetic performance of R744. (C) 2013 Elsevier Ltd and IIR. All rights reserved.
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收藏
页码：2148 / 2159
页数：12
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