Journal
APPLIED THERMAL ENGINEERING
Volume 137, Issue -, Pages 193-202Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2018.03.086
Keywords
Two-phase injection; Vapor injection; Liquid injection; Heat pump; Scroll compressor
Funding
- Industrial Core Technology Development Program of the Korea Evaluation Institute of Industrial Technology (KEIT) - Republic of Korea - Korea Government Ministry of Trade, Industry and Energy, Republic of Korea [10049090]
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Although two-phase injection technique is expected to improve the performance and reliability of heat pumps in cold climate conditions, its application is limited due to wet-compression. In this study, a numerical model was developed and validated to predict the performance of liquid, vapor, and two-phase injection heat pumps. The performance characteristics of the liquid, vapor, and two-phase injection heat pumps with a scroll compressor using R410A were compared with the others, based on the predicted data. The optimum injection quality in the two-phase injection heat pump to achieve maximum COP was analyzed as a function of the injection pressure, compressor frequency, and outdoor temperature. The two-phase injection heat pump with the optimum injection quality exhibited the highest COP among all injection types with a proper discharge temperature. In addition, the two-phase injection heat pump with the optimum injection quality was more effective in COP improvement with decreasing outdoor temperature.
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