| Title |
Effects of Channel Amplitude Ratio on Flow and Heat Transfer Characteristics of Primary Surface Heat Exchanger for ORC |
| Authors |
문제현(Je-Hyeon Moon) ; 박근태(Keun-Tae Park) ; 김현진(Hyun-Jin Kim) |
| DOI |
http://dx.doi.org/10.6110/KJACR.2014.26.4.151 |
| Keywords |
스크롤 팽창기 ; 대수나선 ; 폐열회수 ; 랭킨 사이클 ; 축출력 Scroll expander ; Algebraic spiral ; Waste heat recovey ; Rankine cycle ; Shaft power |
| 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 90～93℃ 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. |