Abstract—Organic Rankine Cycle (ORC) has attracted much attention as a promising technology for an efficient conversion of low-grade energy into electricity. In this study the thermodynamic performance of transcritical ORC with varying source temperature is investigated. The system uses R134a as working fluid and its performance such as the ratio of mass flow rate, specific net work, and thermal and exergy efficiencies are parametrically investigated. Results for the source temperature ranging 160-300oC and the reduced turbine inlet pressure (TIP) up to 3 show that the ratio of mass flow rate increases with TIP for fixed source temperature. It is also shown that the specific net work, and thermal and exergy efficiencies increase with TIP in the subcritical region and have a peak in the supercritical region for each source temperature. Thermal efficiency can be raised by adopting supercritical cycle with sufficiently high source temperature.
Index Terms—Organic rankine cycle (ORC), source temperature, transcritical, turbine inlet pressure.
Hyung Jong Ko, Chul Ho Han, and Kyoung Hoon Kim are with the Department of Mechanical Engineering, Kumoh National Institute of Technology, Gumi, Gyeongbuk 730-701, Korea (e-mail: {kohj, chhan, khkim}@kumoh.ac.kr).
Se Woong Kim is with the Department of Mechanical Engineering, Kumoh National Institute of Technology, Gumi, Gyeongbuk 730-701, Korea (e-mail: ksw@kumoh.ac.kr).
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Cite:Hyung Jong Ko, Se Woong Kim, Chul Ho Han, and Kyoung Hoon Kim, "Effects of Source Temperature on Thermodynamic Performance of Transcritical Organic Rankine Cycle," International Journal of Materials, Mechanics and Manufacturing vol. 1, no. 1, pp. 55-59, 2013.
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