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Title:
Thermal energy harvesting device using ferromagnetic materials
Authors:
Ujihara, M.; Carman, G. P.; Lee, D. G.
Affiliation:
AA(Department of Mechanical and Aerospace Engineering, University of California, 420 Westwood Plaza, Los Angeles, California 90095), AB(Department of Mechanical and Aerospace Engineering, University of California, 420 Westwood Plaza, Los Angeles, California 90095), AC(PowerMEMS Techologies Inc., 19925 Stevens Creek Blvd., Cupertino, California 95014)
Publication:
Applied Physics Letters, Volume 91, Issue 9, id. 093508 (3 pages) (2007). (ApPhL Homepage)
Publication Date:
08/2007
Origin:
AIP
PACS Keywords:
Thermoelectric devices
Abstract Copyright:
(c) 2007: American Institute of Physics
DOI:
10.1063/1.2775096
Bibliographic Code:
2007ApPhL..91i3508U

Abstract

A unique concept for harvesting electrical energy from thermal energy is presented. A thermomechanical actuator was fabricated using ferromagnetic material. The device converts thermal energy into mechanical energy, which can be converted into electrical energy using piezoelectric materials. Magnetic force and operating frequency were measured on the device. Results show that the current power density at ΔT=50 K is between 1.85 and 3.61 mW/cm2. A thermal finite element analysis model is also presented to understand the influence of thermal interface, suggesting that increases of 18.5 mW/cm2 or higher are achievable.
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