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Appl. Sci. 2017, 7(3), 248; doi:10.3390/app7030248

The Effects of Wet Compression by the Electronic Expansion Valve Opening on the Performance of a Heat Pump System

1
School of Mechanical Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-Ku, Seoul 03722, Korea
2
Center of Doowon heavy industrial Co., Ltd., 51 Gwaneumdang-Gil, Juksan-Myon, Anseong-Si, Gyeonggi-Do 17520, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Takahiko Miyazaki
Received: 9 January 2017 / Accepted: 1 March 2017 / Published: 3 March 2017
(This article belongs to the Special Issue Sciences in Heat Pump and Refrigeration)
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Abstract

In this study, by controlling the Electronic Expansion Valve opening, the influence of wet compression on a heat pump system was experimentally investigated in different heating conditions. The results demonstrate that the discharge temperature decreased and the mass flow rate increased, due to quality of the rising liquid droplets. It was also found that the heating capacity and power input of wet compression increased more than that of dry compression, with a superheat of 10 °C. The maximum COP (Coefficient of Performance) exists at a specific quality of ca. 0.94 to 0.90, as the power input in the region of wet compression is proportionally larger than the increase in the heating capacity, according to the decreasing quality. When the Entering Water Temperature of the Outdoor Heat Exchanger was 10 °C, 5 °C, and 0 °C, the COP increased by a maximum of ca. 12.4%, 10.6%, and 10.2%, respectively, in comparison to the superheat of 10 °C. In addition, the superheat at the discharge line is proposed as a proper controlling parameter to adjust the quality at the suction line, by varying the opening of the expansion valve during wet compression. View Full-Text
Keywords: heat pump; wet compression; dry compression; electronic expansion valve opening; two-phase mixture; quality heat pump; wet compression; dry compression; electronic expansion valve opening; two-phase mixture; quality
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Seong, K.; Lee, D.; Lee, J. The Effects of Wet Compression by the Electronic Expansion Valve Opening on the Performance of a Heat Pump System. Appl. Sci. 2017, 7, 248.

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