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Proceedings Paper

On the efficiency of heat engines by pulsed laser
Author(s): Hideki Okamura
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Paper Abstract

The purpose of this paper is to present a possibility of improving the efficiency of light driven actuators by using pulsed laser and to investigate theoretical limit of its efficiency, thereby providing an insight for the design of an efficient light driven actuator in the future. Many light driven actuators based on the heat deposit can be regarded as heat engines, and consequently their efficiencies are subjected to the limitation from Carnot's theory, which dictates that the maximum efficiency is larger for larger temperature difference between the high- and the low-temperature reservoirs. If one uses focused laser pulses, an extremely high temperature difference can be created for a short fraction of time, therefore, there is a possibility of achieving a higher efficiency. In the theoretical treatment, a cycle in which heat is given instantaneously in an adiabatic condition was considered. The formula for the maximum efficiency was derived, which gives about the half that of Carnot cycle efficiency at an ambient temperature of 300K. In an ideal case, for the instantaneous temperature increase of 200K the maximum efficiency can be about 20 %.

Paper Details

Date Published: 17 November 2008
PDF: 7 pages
Proc. SPIE 7266, Optomechatronic Technologies 2008, 726609 (17 November 2008); doi: 10.1117/12.807414
Show Author Affiliations
Hideki Okamura, International Christian Univ. (Japan)

Published in SPIE Proceedings Vol. 7266:
Optomechatronic Technologies 2008
John T. Wen; Dalibor Hodko; Yukitoshi Otani; Jonathan Kofman; Okyay Kaynak, Editor(s)

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