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http://dx.doi.org/10.6110/KJACR.2013.25.3.168

A Study on the Operating Control of a Heat Pump System with Screw Compressors  

Park, Jun-Tark (Department of Energy Efficiency, Korea Institute of Energy Research(KIER))
Lee, Young-Soo (Department of Energy Efficiency, Korea Institute of Energy Research(KIER))
Kim, Jiyoung (Department of Energy Efficiency, Korea Institute of Energy Research(KIER))
Chae, Kyu-Jung (Environmental Technology Lab, R&BD Center, Kolon Global Corp.)
Yang, Hee-Jung (Environmental Technology Lab, R&BD Center, Kolon Global Corp.)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.25, no.3, 2013 , pp. 168-172 More about this Journal
Abstract
A preliminary performance test of a 30RT 2-stage screw heat pump was carried out in order to develop a high performance large-scale unutilized energy source heat pump system, which will be used for district heating and cooling. In this study, two issues of the system operating control were investigated. The first issue is the mode switching control from 1-stage to 2-stage. A stable 2-stage heating operation is guaranteed, only if the load-side water inlet temperature is over a certain value, where the 1-stage heating operation should be done first from a cold start. The second issue is oil level control. An oil shortage problem in the low stage compressor, which depends on the degree of suction superheat, was solved by a proper oil level control scheme.
Keywords
Screw compressor; 2-stage compression; Heat pump; Oil level control;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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