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Indexed by:期刊论文

Date of Publication:2015-03-01

Journal:INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID

Included Journals:SCIE、EI、Scopus

Volume:51

Page Number:88-102

ISSN No.:0140-7007

Key Words:Heat pump; Two-stage system; Model; Refrigerant; Injection

Abstract:Two-stage vapor compression technology has high potential of performance improvement for cold climate heat pumps, and there are several types of inter-stage configurations that need to be evaluated before making a choice. A general model of these configurations is first derived from a subcooler cycle and then is extended to be capable of evaluating many other inter-stage configurations by employing an "input domain". The model is solved with a sequential algorithm and an analytical initial solution of the intermediate pressure is presented. After an experimentally validation with additional calculations of the sub-cooling parameter, the evaporating and condensing pressure, this general model is then used in the performance comparison and analysis of eight different inter-stage configurations. At last, case studies show that, this general model is capable of performing performance comparison among cycles with different types of inter-stage configurations, as well as refrigerant selection and operational analysis. (C) 2014 Elsevier Ltd and IIR. All rights reserved.