George Meramveliotakis , George Kosmadakis , Sotirios Karellas
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引用次数: 0
Abstract
Transition to low-global-warming-potential (GWP) refrigerants is a significant issue for reducing the environmental impact of heat pumps to comply with stringent regulations. This study evaluates the performance of a scroll compressor with vapor injection (VI) using R454C as a low GWP drop-in replacement for R407C in a water source heat pump. Key performance indicators, including isentropic and volumetric efficiency, heating capacity and COP, are investigated across a wide range of operating conditions. These include varying compressor speeds, superheats at both the main and economizer electronic expansion valves as well as condensation and evaporation temperatures. Results indicate that R454C achieves higher volumetric efficiency (+2 %) and mass flow rate (+11–13 %) compared to R407C but leads to a lower heating capacity by 13–14.8 % and a decreased COP by 6 % due to lower latent heat. Vapor injection boosts the heating capacity by up to 30 % while decreases discharge temperatures, especially at high pressure ratios, despite an 8 % reduction in isentropic efficiency. These findings underscore the potential of R454C as a low-GWP replacement in heat pumps and highlight the critical role of VI in enhancing system performance even at moderate temperature lifts.
期刊介绍:
The International Journal of Refrigeration is published for the International Institute of Refrigeration (IIR) by Elsevier. It is essential reading for all those wishing to keep abreast of research and industrial news in refrigeration, air conditioning and associated fields. This is particularly important in these times of rapid introduction of alternative refrigerants and the emergence of new technology. The journal has published special issues on alternative refrigerants and novel topics in the field of boiling, condensation, heat pumps, food refrigeration, carbon dioxide, ammonia, hydrocarbons, magnetic refrigeration at room temperature, sorptive cooling, phase change materials and slurries, ejector technology, compressors, and solar cooling.
As well as original research papers the International Journal of Refrigeration also includes review articles, papers presented at IIR conferences, short reports and letters describing preliminary results and experimental details, and letters to the Editor on recent areas of discussion and controversy. Other features include forthcoming events, conference reports and book reviews.
Papers are published in either English or French with the IIR news section in both languages.