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Title: Theoretical and experimental evaluation of thermal interface materials and other influencing parameters for thermoelectric generator system
Authors: Singh, H
Karthick, K
Suresh, S
Joy, GC
Dhanuskodi, R
Keywords: Thermal interface material;Thermoelectric generator;Contact pressure;COMSOL;Heat transfer model
Issue Date: 2018
Publisher: Elsevier
Citation: Renewable Energy, 2018, 134 pp. 25 - 43 (19)
Abstract: Thermal interface resistance of Thermoelectric Generator (TEG) plays a vital role in power production. Improving surface finish of contact surfaces, applying pressure between the contact surfaces and use of Thermal Interface Material (TIM) are few methods of reducing thermal resistance and thereby improving the efficiency of TEG. There is a need to evaluate the influence of these methods and use them optimally for TEG system. Experiments were carried out to study the influence of parameters such as thermal conductivity of TIM, contact pressure, surface roughness and heat source temperature on the voltage and power outputs from TEG. Experimental results are validated with simulations using mathematical heat transfer model and COMSOLTM Multiphysics numerical model. Appreciable agreement is seen between the experimental observations and model outputs. Experimental and model results indicate 0.6 W/mK as optimum thermal conductivity for TIM material. Hence, use of costly TIMs like MWCNT (Multi Wall Carbon Nano Tube) and copper nanoparticles may not be required for the selected application. The contact pressure and surface roughness have appreciable influence when air is used as TIM. These factors have insignificant influence for TIMs with higher thermal conductivity. Increase in heat source temperature increases voltage and power output of TEG.
ISSN: 0960-1481
Appears in Collections:Dept of Mechanical Aerospace and Civil Engineering Embargoed Research Papers

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