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ECN publication
A hot air driven thermoacoustic-Stirling engine
Published by: Publication date:
ECN Biomass & Energy Efficiency 12-9-2012
ECN report number: Document type:
ECN-M--12-044 Conference Paper
Number of pages: Full text:
7 Download PDF  

Significant energy savings can be obtained by implementing a thermally driven heat pump into industrial or domestic applications. Such a thermally driven heat pump uses heat from a high-temperature source to drive the system which upgrades an abundantly available heat source (industrial waste heat, air, water, geothermal). A way to do this is by coupling a thermoacoustic engine with a thermoacoustic heat pump. The engine is driven by a burner and produces acoustic power and heat at the required temperature. The acoustic power is used to pump heat in the heat pump to the required temperature. This system is attractive since it uses a noble gas as working medium and has no moving mechanical parts. This paper deals with the first part of this system: the engine. In this study, hot air is used to simulate the flue gases originating from a gas burner. This is in contrast with a lot of other studies of thermoacoustic engines that use an electrical heater as heat source. Using hot air resembles to a larger extent the real world application. The engine produces about 300 W of acoustic power with a performance of 41 % of the Carnot efficiency at a hot air temperature of 620?C.

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