Mathematical Modelling of a Reciprocating Piston Expander

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Modern internal combustion (IC) engines reject around two thirds of the energy provided by the fuel as low-grade waste heat. Capturing a portion of this waste heat energy and transforming it into a more useful form of energy could result in a significant reduction in fuel consumption. By using the low-grade heat, an organic Rankine cycle (ORC) can produce mechanical work from a pressurised organic fluid with the use of an expander.
Ideal gas assumptions are shown to produce significant errors in expander performance predictions when using an organic fluid. This paper details the mathematical modelling technique used to accurately model the thermodynamic processes for both ideal and non-ideal fluids within the reciprocating expander. A comparison between the two methods illustrates the extent of the errors when modelling a reciprocating piston expander. Use of the ideal gas assumptions are shown to produce an error of 55% in the prediction of power produced by the expander when operating on refrigerant R134a.
Original languageEnglish
Number of pages10
Publication statusPublished - May 2013
EventVTMS 11 Vehicle Thermal Management Systems - Coventry, United Kingdom
Duration: 15 May 201316 May 2013


ConferenceVTMS 11 Vehicle Thermal Management Systems
Country/TerritoryUnited Kingdom

Bibliographical note

ISBN 0857094726


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