Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2015-03-01

Journal: INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID

Included Journals: Scopus、EI、SCIE

Volume: 51

Page Number: 88-102

ISSN: 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.