Journal
APPLIED THERMAL ENGINEERING
Volume 48, Issue -, Pages 476-485Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2012.04.028
Keywords
Enhanced geothermal system; Organic Rankine cycle; Working fluid; Vaporization control model; Total heat control mode
Funding
- National High Technology Research and Development Program of China (863 Program) [2012AA052803]
- Tsinghua University Initiative Scientific Research Program [2009THZ02232]
- Key Project Fund of the National Natural Science Foundation of Beijing [3110001]
- Ladder Program Project of the Beijing Key Laboratory of CO2 Utilization and Reduction Technology [Z111109055311094]
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Enhanced Geothermal Systems show promise for meeting growing energy demands. The Organic Rankine Cycle (ORC) can be used to convert low and medium-temperature geothermal energy to electricity, but the working fluid must be carefully selected for the ORC system design. This paper compares the system performance using R134a, isobutane, R245fa and isopentane for four typical geofluid temperatures below 200 degrees C. Three type (subcritical, superheated and transcritical) power generation cycles and two heat transfer control models (total heat control model and vaporization control model) are used for different EGS source temperatures and working fluids. This paper presents a basic analysis method to select the most suitable working fluid and to optimize the operating and design parameters for a given EGS resource based on the thermodynamics. (c) 2012 Elsevier Ltd. All rights reserved.
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