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Title: Thermo-economic analysis and selection of working fluid for solar organic Rankine cycle
Authors: DESAI, NB
Keywords: Thermal Power-Plant
Parabolic Trough Collector
Linear Fresnel Collectors
Direct Steam-Generation
Exhaust Heat-Recovery
Low-Grade Heat
Waste Heat
Thermodynamic Analysis
Performance Evaluation
Issue Date: 2016
Abstract: Organic Rankine cycle (ORC), powered by line-focusing concentrating solar collectors (parabolic trough collector and linear Fresnel reflector), is a promising option for modular scale. ORC based power block, with dry working fluids, offers higher design and part-load efficiencies compared to steam Rankine cycle (SRC) in small-medium scale, with temperature sources up to 400 degrees C. However, the cost of ORC power block is higher compared to the SRC power block. Similarly, parabolic trough collector (PTC) system has higher optical efficiency and higher cost compared to linear Fresnel reflector (LFR) system. The thermodynamic efficiencies and power block costs also vary with working fluids of the Rankine cycle. In this paper, thermo-economic comparisons of organic Rankine and steam Rankine cycles powered by line focusing concentrating solar collectors are reported. A simple selection methodology, based on thermoeconomic analysis, and a comparison diagram for working fluids of power generating cycles are also proposed. Concentrating solar power plants with any collector technology and any power generating cycle can be compared using the proposed methodology. (C) 2015 Elsevier Ltd. All rights reserved.
ISSN: 1359-4311
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