Experimental Verification of Source Temperature Modulation via a Thermal Switch in Thermoelectric Energy Harvesting

Document Type

Conference Paper

Publication Date


Publication Source

ASME 2006 International Mechanical Engineering Congress and Exposition


This paper provides a description of research seeking to experimentally verify the effectiveness of a thermal switch used in series with TE devices for waste heat recovery for constant and variable source heat input, and for variable source thermal capacitance (mass). Using an experimental set-up comprised serially of a fixed heat source, a variable thermal resistance air gap serving as a thermal switch, a thermoelectric device and a heat sink mounted on a translation stage, the time-averaged power output to power input ratios improved up to 15% and 30% respectively for constant and variable heat input in certain design space conditions. The experimental results, as supported by model predictions, suggest that the thermal capacitance of the heat source must be greater than the thermal capacitance of the TE device in order for thermal switching to improve the time-averaged power output to power input ratios of waste heat recovery systems.

Inclusive pages





Permission documentation is on file.


American Society of Mechanical Engineers

Place of Publication

Chicago, IL

Peer Reviewed