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Study on thermal efficiency of low- to medium-temperature organic Rankine cycles using HFO−1234yf

Yamada, Noboru and Mohamad, Md Nor Anuar and Trung Kien, Trinh (2012) Study on thermal efficiency of low- to medium-temperature organic Rankine cycles using HFO−1234yf. Renewable Energy, 41. ISSN 09601481

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Abstract

HFO−1234yf is a new refrigerant with a nearly zero global warming potential (GWP) and ozone depletion potential (ODP); it exhibits thermodynamic properties similar to HFC−134a. The potential of HFO−1234yf as a working fluid for organic Rankine cycles (ORC) is elucidated through a first-order simulation. A fundamental thermodynamic model of ORC with five types of cycles—trilateral, saturated, superheated, sub-critical, and supercritical—is used to compare the thermal efficiency of HFO−1234yf with that of other working fluids. HFO−1234yf was found to offer a thermal efficiency that was comparable to that of HFC−134a. This paper provides a useful map that clearly shows the best possible thermal efficiency among the five types of cycles for various expander inlet and condensation temperatures. The highest thermal efficiency range (8.8%–11.4%) was obtained when the supercritical ORC was used at an expander inlet temperature of 170 ± 10 °C and a condensation temperature range of 20–40 °C for the given pump and expander efficiency. It is concluded that HFO−1234yf is a potential working fluid for ORC applications, especially for those with low- to medium-temperature heat sources.

Item Type: Article
Uncontrolled Keywords: HFO–1234yf; organic rankine cycle; thermal efficiency; working fluid; global warming potential;ozone depletion potential
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ165 Energy storage
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Plant and Automotive Engineering
Depositing User: En. Muhamad Saufi Che Rusuli
Date Deposited: 08 Nov 2012 07:35
Last Modified: 08 Nov 2012 07:35
URI: http://eprints.uthm.edu.my/id/eprint/3190
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