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Effects of flash gas generation at the expansion device inlet on the dynamic characteristics of a refrigeration system

Authors
Kang, HoonJoo, YoungjuKim, Yonchan
Issue Date
May-2008
Publisher
ELSEVIER SCI LTD
Keywords
refrigeration system; electronic expansion device; survey; performance; parameter; two-phase flow; gas; expansion
Citation
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, v.31, no.3, pp.396 - 403
Indexed
SCIE
SCOPUS
Journal Title
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
Volume
31
Number
3
Start Page
396
End Page
403
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/123690
DOI
10.1016/j.ijrefrig.2007.08.005
ISSN
0140-7007
Abstract
The flash gas generation at the expansion device inlet in multi-air-conditioners causes rapid reduction of refrigerant mass flow rate and irregular distribution of refrigerant into multi-indoor units. The objective of this study is to evaluate the influence of the flash gas generation on the dynamic characteristics of a refrigeration system. The dynamic characteristics of a refrigeration system with an electronic expansion valve (EEV) were measured with time at various levels of flash gas generation, which were expressed as flash gas ratio. In addition, the averaged operating parameters and system COP were investigated with the variation of flash gas ratio. As the EEV inlet condition changed from the subcooled to the two-phase state, the refrigerant flow rate decreased rapidly due to the flash gas generation at the EEV inlet. At two-phase inlet conditions, the system operating parameters, such as mass flow rate, suction and discharge pressures, fluctuated periodically with time. As the flash gas ratio increased, the average COP decreased and the discharge temperature increased, degrading the system performance and reliability more severely. (C) 2007 Elsevier Ltd and IIR. All rights reserved.
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