NDLI: Carbon Nanotube Interfaces for Magneto Thermoelectric Actuation

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Patrick, T. Mccarthy Stephen, L. Hodson Timothy, D. Sands Timothy, S. Fisher
Copyright Year	2010
Abstract	Magneto thermoelectric generator cell technology uses the ferromagnetic phase transition of gadolinium to drive the movement of a diaphragm ‘shuttle’ whose mechanical energy can be converted to electrical form and which enhances heat transfer through both conduction and convection. This paper describes the thermal behavior of gadolinium foils used in magneto thermoelectric generator cells that, in conjunction with a planar array of similar devices, would form a thermal backplane to a solar photovoltaic panel. In this scenario, the backplane operates as a self-powered cooling device that can simultaneously convert thermal energy to electrical energy as well as improve photovoltaic efficiency through active cooling. This form of energy harvesting and enhancement shows the potential of increasing the energy density of silicon photovoltaic panels. The synthesis and characterization of thermal interfaces applied to the gadolinium shuttles and hot/cold substrates are described. Carbon nanotube arrays are implemented as the thermal interfaces, and their performance under static conditions is assessed. Optimization of the carbon nanotube interfaces on the gadolinium shuttles is achieved using photoacoustic experiments for measuring the thermal interface resistances above and below the gadolinium foil. Carbon nanotube growth studies on gadolinium demonstrated a reduction in thermal interface resistances from 28.8 ± 2.1 mm2K/W to as low as 17.9 ± 0.8 mm2K/W. Initial design, fabrication, and experimental techniques and results are presented in this paper.
Sponsorship	Heat Transfer Division
Starting Page	539
Ending Page	545
Page Count	7
File Format	PDF
ISBN	9780791849422
DOI	10.1115/IHTC14-22810
e-ISBN	9780791838792
Volume Number	2010 14th International Heat Transfer Conference, Volume 7
Conference Proceedings	2010 14th International Heat Transfer Conference
Language	English
Publisher Date	2010-08-08
Publisher Place	Washington, DC, USA
Access Restriction	Subscribed
Subject Keyword	Cooling Diaphragms (structural) Carbon nanotubes Gadolinium Generators Energy harvesting Density Phase transitions Convection Optimization Thermal energy Design Heat conduction Diaphragms (mechanical devices) Solar energy Silicon Manufacturing Heat transfer
Content Type	Text
Resource Type	Article

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