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김영민(Young Min Kim),신동길(Dong Kil Shin),이장희(Jang Hee Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The Ericsson cycle is very much like the Stirling cycle, except that the processes of constant-volume regenerative heat transfer are replaced by constant-pressure regenerative processes. The efficiency of the Ericsson cycle is the same as that of the Carnot cycle, as in the Stirling cycle. But in the both cases, in spite of the high potentiality of the cycles, it is very difficult to realize the ideal cycle, because neither the isothermal compression nor isothermal expansion in the cylinder or with the turbomachinery is practical due to the insufficient heat transfer. In this paper, it was proposed that the scroll-type compressor and expander is fairly suitable for approaching the isothermal compression and expansion processes due to the area to volume ratio of scroll geometry and good gas to scroll heat transfer. And the thermodynamic characteristics of the proposed Ericsson cycle engine was investigated.
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유기 랭킨 사이클용 스크롤 팽창기 성능 시험에 관한 연구
문제현(Je-Hyeon Moon),박근태(Keun-Tae Park),김현진(Hyun-Jin Kim) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.4
An algebraic scroll expander has been fabricated and tested in a R134a Rankine cycle with heat source of 20 kW. For the operating conditions of 20~26 bar and 90~93℃ at the expander inlet and 8~9 bar at the outlet, the expander produced the shaft output power of about 0.6~0.7 kW in the operating speed range of 1500~2000 rpm. These correspond to the expander efficiency of 40~45%. The volumetric efficiency increased with increasing of the expander speed, reaching to 80% at 2000 rpm. Comparing to numerical simulation results, mechanical efficiency from the test data was found to be considerably low by as much as 30%, indicating that reduction in the frictional loss should be made to improve the scroll expander efficiency.
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