THERMAL SCIENCE

International Scientific Journal

INFLUENCE OF ELECTRONIC EXPANSION VALVE ON THE PERFORMANCE OF SMALL WINDOW AIR CONDITIONER RETROFITTED WITH R407C AND R290

ABSTRACT
The objective of this study is to investigate the influence of Electronic Expansion Valve (EEV) on the performance of window air conditioner retrofitted with R407C and R290. The window air conditioner applying the EEV is tested by varying the compressor inlet superheat from 0ºC to 20ºC. The eco friendly refrigerant R407C has the similar thermodynamic properties as those of R22 with an exception of temperature gliding during the phase change at constant pressure. R290 is a hydrocarbon which also exhibits properties very close to R22 which enables this to be used as a potential alternative to R22.The EEV affords a precise, fast, and stable flow control for a wide range of flow rate due to its use of an electronic control method based on an advanced control algorithm.EEV controls the refrigerant flow through the evaporator by means monitoring pressure and temperature at the outlet of the evaporator and hence it shows good overall performances comparing the capillary tube system. The Coefficient of Performance (COP) of R290 is the maximum among the three refrigerants tested and also for all the three refrigerants, COP is low at higher degree of superheat.
KEYWORDS
PAPER SUBMITTED: 2010-06-29
PAPER REVISED: 2010-09-19
PAPER ACCEPTED: 2010-10-25
DOI REFERENCE: https://doi.org/10.2298/TSCI100629081C
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2011, VOLUME 15, ISSUE Supplement 2, PAGES [S383 - S390]
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