A micro heat engine executing an internal carnot cycle

Eli Lurie*, Abraham Kribus

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

A micro heat engine, based on a cavity filled with a stationary working fluid under liquid-vapor saturation conditions and encapsulated by two membranes, is described and analyzed. This engine design is easy to produce using MEMS technologies and is operated with external heating and cooling. The motion of the membranes is controlled such that the internal pressure and temperature are constant during the heat addition and removal processes, and thus the fluid executes a true internal Carnot cycle. A model of this Saturation Phase-change Internal Carnot Engine (SPICE) was developed including thermodynamic, mechanical and heat transfer aspects. The efficiency and maximum power of the engine are derived. The maximum power point is fixed in a three-parameter space, and operation at this point leads to maximum power density that scales with the inverse square of the engine dimension. Inclusion of the finite heat capacity of the engine wall leads to a strong dependence of performance on engine frequency, and the existence of an optimal frequency. Effects of transient reverse heat flow, and 'parasitic heat' that does not participate in the thermodynamic cycle are observed.

Original languageEnglish
Title of host publication2008 Proceedings of the 2nd International Conference on Energy Sustainability, ES 2008
Pages165-172
Number of pages8
StatePublished - 2009
Event2008 2nd International Conference on Energy Sustainability, ES 2008 - Jacksonville, FL, United States
Duration: 10 Aug 200814 Aug 2008

Publication series

Name2008 Proceedings of the 2nd International Conference on Energy Sustainability, ES 2008
Volume2

Conference

Conference2008 2nd International Conference on Energy Sustainability, ES 2008
Country/TerritoryUnited States
CityJacksonville, FL
Period10/08/0814/08/08

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