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- Title
Empirical Correlation of Refrigerant HC290/HC600a/HFC407C Mixture in Adiabatic Capillary Tube Using Statistical Experimental Design.
- Authors
Shodiya, S.; Azhar, A. A.; Darus, A. N.
- Abstract
HCFCs, in addition to destroying the ozone layer, have been recognized as a contributing factor that increases global warming. It is widely used as working fluid in window air-conditioning system, where capillary tube serves as an expansion device. Literature reports have shown that no single refrigerant can solve the problem of ozone layer depletion and global warming. Refrigerant HC290/HC600a/HFC407C mixture, an eco-friendly refrigerant, has been recognized as an alternative to HCFC22. The objective of this study is to, for cost effectiveness, develop an empirical correlation to predict the refrigerant F1C290/ HC600a/HFC407C mixture mass flow rate using statistical experimental design approach. A review of relevant literature shows that refrigerant's mass flow rate depends on condensing temperature, degree of subcooling, inner diameter and length of capillary tube. The relationship between the mass flow rate and the four independent variables was established as an empirical mathematical correlation using central composite design (CCD), a response surface methodology (RSM). This empirical correlation was examined using analysis of variance (ANOVA) of 5% level of significance. The results of these analysis showed that the correlation fitted well with the experimental data yielding an average and standard deviation of 1.05% and 2.62%, respectively. The validity of the present correlation was further assessed by comparing it with published empirical correlation in literature and the result showed that the present correlation is consistent.
- Subjects
REFRIGERANTS; MIXTURES; CAPILLARY tubes; HYDROCHLOROFLUOROCARBONS; OZONE layer; GLOBAL warming; AIR conditioning
- Publication
Pertanika Journal of Science & Technology, 2014, Vol 22, Issue 2, p445
- ISSN
0128-7680
- Publication type
Article