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http://dx.doi.org/10.6110/KJACR.2014.26.4.151

Effects of Channel Amplitude Ratio on Flow and Heat Transfer Characteristics of Primary Surface Heat Exchanger for ORC  

Moon, Je-Hyeon (Department of Mechanical System Engineering, Incheon National University)
Park, Keun-Tae (Department of Mechanical System Engineering, Incheon National University)
Kim, Hyun-Jin (Department of Mechanical System Engineering, Incheon National University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.26, no.4, 2014 , pp. 151-157 More about this Journal
Abstract
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 $90{\sim}93^{\circ}C$ 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.
Keywords
Scroll expander; Algebraic spiral; Waste heat recovey; Rankine cycle; Shaft power;
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Times Cited By KSCI : 2  (Citation Analysis)
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