DOI: https://doi.org/10.14710/ijred.8.2.141-148

Comparison of single and double stage regenerative organic rankine cycle for medium grade heat source through energy and exergy estimation

1Research Centre for Electrical Power and Mechatronics (RCEPM) - Indonesian Institute of Sciences (IIoS), Komplek LIPI, Gedung 20, Lantai 2, Jalan Sangkuriang, Bandung, West Java,, Indonesia

2Research Unit for Clean Technology - Indonesian Institute of Sciences (IIoS), Komplek LIPI, Gedung 50, Jalan Sangkuriang, Bandung, West Java, Indonesia, Indonesia

Received: 2 Jul 2018; Revised: 26 Mar 2019; Accepted: 20 Jun 2019; Available online: 15 Jul 2019; Published: 13 Jun 2019.
Editor(s): H Hadiyanto
Open Access Copyright (c) 2019 The Authors. Published by Centre of Biomass and Renewable Energy (CBIORE)
Creative Commons License This work is licensed under a Creative Commons Attribution 4.0 International License.

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Abstract
Regenerative organic Rankine cycle (RORC) can be used to improve organic Rankine cycle (ORC) performance. This paper presents a comparison of a single (SSRORC) and double stage regenerative organic Rankine cycle (DSRORC) using a medium grade heat source. Performance for each system is estimated using the law of thermodynamics I and II through energy and exergy balance. Solar thermal is used as the heat source using therminol 55 as a working fluid, and R141b is used as the organic working fluid. The initial data for the analysis are heat source with 200°C of temperature, and 100 L/min of volume flow rate. Analysis begins by calculating energy input to determine organic working fluid mass flow rate, and continued by calculating energy loss, turbine power and pump power consumption to determine net power output and thermal efficiency. Exergy analysis begins by calculating exergy input to determine exergy efficiency. Exergy loss, exergy destruction at the turbine, pump and feed heater is calculated to complete the calculation. Energy estimation result shows that DSRORC determines better net power output and thermal efficiency for 7.9% than SSRORC, as well as exergy estimation, DSRORC determines higher exergy efficiency for 7.69%. ©2019. CBIORE-IJRED. All rights reserved
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Keywords: single stage regenerative organic Rankine cycle; double stage regenerative organic Rankine cycle; medium grade heat source; energy; exergy

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Section: Original Research Article
Language : EN
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