Thermodynamic Analysis of Expansion Profile for Displacement-type Expander in Low-temperature Rankine Cycle

Mohd Tahir , Musthafah and Yamada , Noboru (2010) Thermodynamic Analysis of Expansion Profile for Displacement-type Expander in Low-temperature Rankine Cycle. Journal of Thermal Science and Technology, 5 (1). pp. 61-74. ISSN 1880 - 5566

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Abstract

Thermodynamic analysis of the isentropic and polytropic expansion profiles of typical working fluids was carried out in order to design a highly efficient displacement-type expander for a low-temperature Rankine cycle. First, expansion profiles were analyzed for three typical working fluids: HFC245fa, ammonia, and supercritical CO 2. The hot-side temperature ranged from 60 ° to 120 °C, and the cold-side temperature was 10 °C. In the analysis, isentropic and polytropic expansion processes were assumed to behave thermodynamically. In the analysis results, we noted similarities among the expansion profiles for different hot-side temperatures. This similarity allowed us to introduce the unique concept of a variable mechanism for expansion profile fitting in displacement-type expanders. This variable expansion mechanism can be achieved by simply adjusting the position of the inlet and/or outlet port of the expander. © 2010 by JSME.

Item Type:	Article
Uncontrolled Keywords:	Organic Rankine Cycle, Thermodynamic Cycle, Thermal Efficiency, Expander Efficiency, Waste Heat Recovery, Displacement-type Expander
Subjects:	T Technology > TJ Mechanical engineering and machinery
Divisions:	Faculty of Mechanical Engineering > Department of Automotive
Depositing User:	Dr Musthafah Mohd Tahir
Date Deposited:	25 Jul 2013 15:40
Last Modified:	27 Jan 2022 12:58
URI:	http://eprints.utem.edu.my/id/eprint/6507
Statistic Details:	View Download Statistic

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