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Open AccessArticle

Comparison of the Utilization of 110 °C and 120 °C Heat Sources in a Geothermal Energy System Using Organic Rankine Cycle (ORC) with R245fa, R123, and Mixed-Ratio Fluids as Working Fluids

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Mechanical Engineering, Politeknik Negeri Semarang, Semarang 50275, Indonesia
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Faculty of Integrated Technologies, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong BE1410, Brunei Darussalam
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Mechanical Engineering Department, Diponegoro University, Semarang 50275, Indonesia
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School of Information, Systems and Modelling, Faculty of Engineering and Information Technology, University of Technology Sydney, Sydney, NSW 2007, Australia
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Electrical Engineering Department, Cal Poly State University, San Luis Obispo, CA 93407, USA
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Author to whom correspondence should be addressed.
Processes 2019, 7(2), 113; https://doi.org/10.3390/pr7020113
Received: 12 January 2019 / Revised: 2 February 2019 / Accepted: 15 February 2019 / Published: 21 February 2019
(This article belongs to the Special Issue Modeling and Simulation of Energy Systems)
Binary cycle experiment as one of the Organic Rankine Cycle (ORC) technologies has been known to provide an improved alternate scenario to utilize waste energy with low temperatures. As such, a binary geothermal power plant simulator was developed to demonstrate the geothermal energy potential in Dieng, Indonesia. To better understand the geothermal potential, the laboratory experiment to study the ORC heat source mechanism that can be set to operate at fixed temperatures of 110 °C and 120 °C is conducted. For further performance analysis, R245fa, R123, and mixed ratio working fluids with mass flow rate varied from 0.1 kg/s to 0.2 kg/s were introduced as key parameters in the study. Data from the simulator were measured and analyzed under steady-state condition with a 20 min interval per given mass flow rate. Results indicate that the ORC system has better thermodynamic performance when operating the heat source at 120 °C than those obtained from 110 °C. Moreover, the R123 fluid produces the highest ORC efficiency with values between 9.4% and 13.5%. View Full-Text
Keywords: Organic Rankine Cycle (ORC); geothermal energy; binary cycle; R245fa; R123; mixture ratio; Dieng; Indonesia Organic Rankine Cycle (ORC); geothermal energy; binary cycle; R245fa; R123; mixture ratio; Dieng; Indonesia
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Surindra, M.D.; Caesarendra, W.; Prasetyo, T.; Mahlia, T.M.I.; Taufik. Comparison of the Utilization of 110 °C and 120 °C Heat Sources in a Geothermal Energy System Using Organic Rankine Cycle (ORC) with R245fa, R123, and Mixed-Ratio Fluids as Working Fluids. Processes 2019, 7, 113.

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