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김현진,박익서,라필찬 대한설비공학회 2005 설비공학 논문집 Vol.17 No.4
This paper addresses the development of a scroll expander for power generation from relatively low temperature steam source. It has a double-sided orbiting scroll member so that no thrust bearing is needed to support the base plate of the orbiting scroll. Three power transmission shafts are placed at the periphery of the orbiting scroll base plate, and these shafts can also function as anti-rotation devices. Final output is obtained from the main central shaft engaged with the three power transmission shafts through gear assembly. The clearance between the fixed and orbiting scroll elements was estimated by comparing measurement of the mass flow rate with calculation results of a computer simulation. Due to large clearance, the expander total and volumetric efficiencies were measured to be 34% and 43%, respectively. It has been shown through the computer simulation that the total and volumetric efficiencies could be improved to 65% and 83%, respectively, if the current clearance is reduced by half.
유제승(Je Seung Yu),김현재(Hyun Jae Kim),김현진(Hyun Jin Kim) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.12
A scroll expander was designed for an energy converter from waste heat of IC engine coolant to useful shaft work. The scroll expander is to run in a Rankine cycle which receives heat energy transferred from engine coolant circulation cycle. The working fluid was Ethanol. For axial compliance, a back pressure chamber was provided on the rear side of the orbiting scroll. Lubrication oil was delivered by a positive displacement type oil pump driven by the shaft rotation. Performance analysis on the scroll expander showed that the expander efficiency was 63.4%. It extracts shaft power of 0.6 kW out of engine coolant waste heat of 17.5 kW, resulting in the Rankine cycle efficiency of 3.43%.
김현진(Hyun-Jin Kim),문제현(Je-Hyeon Moon),이영성(Young-Sung Lee) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.3
In order to extract shaft power from thermal energy in a R134a Rankine cycle as waste heat recovery system of a passenger car, a scroll expander has been designed. Algebraic spiral is adopted as the base curve for scroll wrap profile in the compact scroll design. About 19% reduction in scroll diameter is accomplished when compared to the conventional involute scroll. Performance analysis on the designed scroll expander shows that the expander efficiency is 85.5% at the vehicle speed of 120 km/hr and it decreases to 67.2% at 60 km/hr, provided that the scroll clearance is kept at 10 μm. The expander can produce shaft power equivalent to about 13~14% of the driving power within the speed range of 60 ~120 km/hr.
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.
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.