Journal
STROJNISKI VESTNIK-JOURNAL OF MECHANICAL ENGINEERING
Volume 65, Issue 4, Pages 212-218Publisher
ASSOC MECHANICAL ENGINEERS TECHNICIANS SLOVENIA
DOI: 10.5545/sv-jme.2019.6040
Keywords
R134a; R152a and R444A; automotive air conditioning; coefficient of performance
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Funding
- Scientific and Technological Research Council of Turkey (TUBITAK) [216M437]
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The conventional refrigerants used in refrigeration systems cause global warming effect if released into the atmosphere. To overcome this problem, refrigerants are classified according to their global warming potential (GWP) values, and some restrictions have been placed on the use and transport of these refrigerants with European regulations. Vapor compression refrigeration (VCR) systems are used to provide desired conditions in many systems and as well as in automobiles. Most of the automotive air conditioning (AAC) systems use R134a which has GWP value of 1300. In this study, the use of the refrigerants which have low GWP values, namely, R152a and R444A as an alternative to the R134a for AAC systems, were investigated experimentally. Moreover, the effect of a plate-type internal heat exchanger (IHX) added into the system was studied with the refrigerant R444A. The cooling capacity, compressor power, coefficient of performance (COP) and total exergy destruction have been determined as performance parameters. Based on the obtained results, the highest COP and cooling capacity were achieved when the R152a used as the refrigerant. Furthermore, the COP of the system was increased when the IHX was used, with R444A as the refrigerant.
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