TY - JOUR
TI - Influence of electronic expansion valve on the performance of small window air conditioner retrofitted with R407C and R290
AU - Chinnaraj Chennuchetty
AU - Govindarajan Palanisamy
AU - Vijayan Raghavan
JN - Thermal Science
PY - 2011
VL - 15
IS - 12
SP - 383
EP - 390
PT - Article
AB - 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.