THERMAL SCIENCE

International Scientific Journal

Şaban Ünal

,

Çağrı Kutlu

,

Mehmet Tahir Erdinç

PERFORMANCE IMPROVEMENT POTENTIALS OF LOW GLOBAL WARMING POTENTIAL REFRIGERANTS FOR INTERCITY BUS AIR CONDITIONING SYSTEM

ABSTRACT
In this study, theoretical investigation of two evaporator ejector refrigeration system was carried out based on energy and exergy analysis using R134a and low global warming potential refrigerants (namely R1234yf and R1234ze(E)). In order to perform the analyses, a simulation model was developed and then the influence of different parameters on the COP, COP increase rate and exergy destructions were discussed for each refrigerant. The model was validated with experi¬mental data for R134a and later used to predict the behavior with R1234yf and R1234ze(E). It was found that the highest exergy destruction occurs in the R1234yf system and the increase rate in the COP with respect to the conventional system by using ejector as an expansion device are 15% for R134a, about 17% for R1234yf and about 15% for R1234ze(E), respectively.
KEYWORDS
ejector, two-evaporator, COP, R1234yf, exergy, low GWP
PAPER SUBMITTED: 2016-07-04
PAPER REVISED: 2017-02-17
PAPER ACCEPTED: 2017-03-03
PUBLISHED ONLINE: 2017-04-08
DOI REFERENCE: https://doi.org/10.2298/TSCI160704084U
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2018, VOLUME 22, ISSUE Issue 3, PAGES [1515 - 1524]
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Performance improvement potentials of low global warming potential refrigerants for intercity bus air conditioning system

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