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http://dx.doi.org/10.5916/jkosme.2013.37.6.575

Mass flow rate ratio analysis for optimal refrigerant charge of a R744 and R404A cascade refrigeration system  

Oh, Hoo-Kyu (Department of Refrigeration and Air-Conditioning Engineering, Pukyong National University)
Son, Chang-Hyo (Department of Refrigeration and Air-Conditioning Engineering, Pukyong National University)
Jo, Hwan (Graduate School of Refrigeration and Air-Conditioning Engineering, Pukyong National University)
Jeon, Min-Ju (Department of Refrigeration and Air-Conditioning Engineering, Pukyong National University)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.37, no.6, 2013 , pp. 575-581 More about this Journal
Abstract
In this paper, the influences of several factors, such as subcooling, superheating degree, internal heat exchanger efficiency, and etc. to the optimal amount of refrigerant charge are investigated for the case of R744-R404A cascade refrigeration system. Refrigerants used in the cascade refrigeration system are R404A in high temperature cycle and R744 in the low temperature cycle. The main results are summarized as follows : The mass flow rate ratio decreases with increasing subcooling, superheating degree and internal heat exchanger efficiency in the high temperature cycle, and evaporating temperature and compression efficiency in the low temperature cycle. And the mass flow rate ratio decreases with decreasing temperature difference of cascade heat exchanger and evaporating, condensing temperature in the high temperature cycle, and subcooling, superheating degree and internal heat exchanger efficiency in the low temperature cycle.
Keywords
Cascade refrigeration system; carbon dioxide (R744); Optimal refrigerant charge;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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