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Behaviour of refrigerant mixtures with gas/liquid injection
Author(s) -
Sami Samuel M.,
Aucoin Shawn
Publication year - 2003
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.941
Subject(s) - refrigerant , thermodynamics , materials science , petroleum engineering , chemistry , engineering , heat exchanger , physics
In this paper, the impact of gas/liquid injection on the behaviour of new alternative refrigerant mixtures such as; R‐410A, R‐507, R‐407C, and R‐404A are discussed, analysed and presented. The test results were obtained using an air–source heat pump set up with enhanced surface tubing heat exchanger under various gas/liquid injection ratios. Performance tests were conducted according to the ARI/ASHRAE Standards. The performance data demonstrated that as gas/liquid injection increases compressor head pressure and discharge temperature decrease and this has a positive effect in protecting the compressor. The effect of gas/liquid injection on mixture behaviour varies from mixture to another depending upon the mixture composition. Furthermore, hot gas injection appears to have a significant and positive influence on the COP. The performance of refrigerants R‐407C and R‐404A has been enhanced with 5% gas injection and mix of gas and liquid 5% injection, respectively. The data presented in these figures also show that other hot gas injection ratios and gas/liquid mix degrade the heat exchanger performance. Copyright © 2003 John Wiley & Sons, Ltd.