2026-09-19T22:36:16Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/546592022-01-13T07:54:36Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024
Steven B. Leeb, John J. Cooley and Peter R. Armstrong.
Stronger, Brad A
Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
Massachusetts Institute of Technology. Department of Mechanical Engineering
2010-04-28T17:16:07Z
2010-04-28T17:16:07Z
2008
2008
http://hdl.handle.net/1721.1/54659
606891494
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2008.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 47-48).
This thesis presents three mechanical structures designed for efficient energy systems. In [3], Cooley presents a modification of a fluorescent lamp which allows it to detect nearby occupants and dim itself automatically. This modification presents marketability challenges, as a metal electrode must be suspended from the lamp, but one solution is to integrate an electrode holder into the bulb socket. We present one design for such an integrated electrode. Second, we discuss the creation of a homopolar motor to convert the low-voltage electrical power available from a thermoelectric wafer, which could be powered by waste heat. We are able to achieve brushes and bearings with electrical resistance as low as 70 m[Omega] and friction torque under 300 ,/N.m to demonstrate a proof-of-concept test setup. The demonstrated electromotive force constant is 82 V/rad/s using a 1 inch diameter, 5500 gauss magnet. Finally, we discuss the application of waste heat harvesting to household water heating, and discuss several designs for a water heater with integrated attachment points for waste heat producing devices.
by Brad A. Stronger.
S.B.
48 p.
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by
copyright. They may be viewed from this source for any purpose, but
reproduction or distribution in any format is prohibited without written
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http://dspace.mit.edu/handle/1721.1/7582
Mechanical Engineering.
Harnessing waste heat and reducing wasted lighting : three mechanical structures for efficient energy systems
Thesis
application/pdf
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Publication
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<Abstract>This thesis presents three mechanical structures designed for efficient energy systems. In [3], Cooley presents a modification of a fluorescent lamp which allows it to detect nearby occupants and dim itself automatically. This modification presents marketability challenges, as a metal electrode must be suspended from the lamp, but one solution is to integrate an electrode holder into the bulb socket. We present one design for such an integrated electrode. Second, we discuss the creation of a homopolar motor to convert the low-voltage electrical power available from a thermoelectric wafer, which could be powered by waste heat. We are able to achieve brushes and bearings with electrical resistance as low as 70 m[Omega] and friction torque under 300 ,/N.m to demonstrate a proof-of-concept test setup. The demonstrated electromotive force constant is 82 V/rad/s using a 1 inch diameter, 5500 gauss magnet. Finally, we discuss the application of waste heat harvesting to household water heating, and discuss several designs for a water heater with integrated attachment points for waste heat producing devices.</Abstract>
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