文档介绍：Energy Conversion and Management 48 (2007) 1624–1630
ate/enconman
Experimental investigation of R407C and R410A flow
through electronic expansion valve
Ye Qifang *, Chen Jiangping, Chen Zhijiu
Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Huashan Road 1954, Shanghai 200030, PR China
Received 6 May 2006; accepted 12 November 2006
Available online 16 January 2007
Abstract
The objective of this study is to present test results and to obtain a dimensionless correlation on the basis of experimental data of an
electronic expansion valve (EEV) for R407C (R32/125/134a, 23/25/52 wt.%) and R410A (R32/125, 50/50 wt.%). Several EEVs with dif-
ferent valve needle half tapers were selected as test sections. The mass flow rate through the EEVs was measured for different condensing
temperatures and degrees of subcooling at the inlet of the EEVs and evaporating temperatures at the outlet of the EEVs. A new corre-
lation by introducing dimensionless parameters based on extensive experimental data of R407C and R410A to predict the mass flow rate
passing through the EEV was presented. The dimensionless parameters were chosen by considering the effects of EEV geometry, inlet
conditions and refrigerant properties. The relative deviations for the dimensionless correlation were from À% to % for
R407C and from À% to % for R410A.
Ó 2006 Elsevier Ltd. All rights reserved.
Keywords: Electronic expansion valve; Mass flow rate; Correlation
1. Introduction The throttle device is one of the most po-
nents in refrigeration systems. The monly used
The use of CFC (chlorofluorocarbon) and HCFC throttle devices in refrigeration systems are a capillary
(hydrochlorofluorocarbon) refrigerants would cause envi- tube, short tube, thermostatic expansion valve (TXV) and
ronmental degradation such as ozone depletion and global electronic expansion valve (EEV). Both the capillary tube
warming, due to which the use of these refrigerants in a