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http://dx.doi.org/10.5293/kfma.2014.17.6.005

A Study of Supersonic Nozzle Design for Partial Admitted Turbine Used on Organic Rankine Cycle  

Cho, Soo-Yong (Gyeongsang National University, Research center of Aircraft Parts Technology)
Cho, Chong-Hyun (SunTech Ltd., R&D Center)
Publication Information
The KSFM Journal of Fluid Machinery / v.17, no.6, 2014 , pp. 5-12 More about this Journal
Abstract
Organic Rankine Cycle is widely used to convert the low-grade thermal energy to the electrical energy. However, usually available thermal energy is not supplied constantly. This makes hard to use positive displacement expanders. Hence, turbo-expander has merits to apply as an expander in ORC because it can operate well off-design points even though the mass flowrate is fluctuated. The thermal energy fluctuation causes the turbo-expander to operate in partial admission. In addition, supersonic nozzles are required so that the partially admitted turbine operates efficiently. In this study, R245fa was chosen as a working fluid of ORC. A design method and an analysis technique of supersonic nozzle based on R245fa were developed. The shape of the nozzle was designed by the characteristic method. The thermal properties within the nozzle were estimated and the predicted results were agreed well with the computed results.
Keywords
Organic rankine cycle; Supersonic nozzle; Partial admitted turbine; Cycle analysis; Refrigerant;
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Times Cited By KSCI : 1  (Citation Analysis)
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