THOMAS L HARMAN
Electrician at Lighthouse Dr, Houston, TX
License number
Texas 17582
Expiration Date
Apr 28, 2017
Category
Master Electrician
Address
Address
2723 Lighthouse Dr, Houston, TX 77058
Phone
(281) 335-1780
Professional information
Professor At University Of Houston
Position:
Professor at University of Houston Clear Lake
Location:
Houston, Texas Area
Industry:
Higher Education
Work:
University of Houston Clear Lake
since Sep 1979
-
Professor
Education:
Rice University 1966 - 1972
PhD, Electrical and Electronics Engineering University of Maryland College Park 1961 - 1965
BSEE, Electrical and Electronics Engineering
PhD, Electrical and Electronics Engineering University of Maryland College Park 1961 - 1965
BSEE, Electrical and Electronics Engineering
Skills:
Applied Mathematics, Scientific Computing, MATLAB, Patents, National Electrical Code
Languages:
French - sometimes
Fluid Heating Control System
US Patent:
6246831, Jun 12, 2001
Filed:
Jun 16, 1999
Appl. No.:
9/334337
Inventors:
David E. Seitz - Conroe TX
David Paul Sharp - Houston TX
Thomas Lamson Harman - Houston TX
Louis J. Everett - College Station TX
Rodney H. Neumann - The Woodlands TX
David Paul Sharp - Houston TX
Thomas Lamson Harman - Houston TX
Louis J. Everett - College Station TX
Rodney H. Neumann - The Woodlands TX
Assignee:
David Seitz - Houston TX
International Classification:
F24H 110
US Classification:
392486
Abstract:
An improved system, method and apparatus for control of an instantaneous flow-through fluid heater system is disclosed. The control incorporates a logic control method providing modulation of power in small steps to a plurality of heating elements retaining responsiveness to closed-loop control needs without inducing light flicker. Further, the life of the coils of heating circuit electromechanical relays are extended by energizing the coils with a pulse-width-modulated drive decreasing in duty cycle and thus the latent coil heat when an increase in mains voltage is sensed. The life of the contacts of same relays are extended by inhibiting heating element triac drive immediately upon sensing loss of relay coil power, such as by an over temperature limit switch opening, thus ensuring that relay contacts open with zero heating element current. In addition to the software "watchdog timer" internal to the microcontroller, a redundant fail-safe circuit external to the microcontroller prevents a program lockup condition from leaving any heating element triac or relay drive in an energized state. A combination of control hardware and program provide self-diagnostic detection of an inoperative thermistor, stuck relay, or a failed triac or heating element.
Tankless Water Heater
US Patent:
2013009, Apr 18, 2013
Filed:
Oct 17, 2011
Appl. No.:
13/274930
Inventors:
David E. Seitz - San Antonio TX, US
James Dabney - Houston TX, US
Louis Everett - El Paso TX, US
Thomas L. Harman - Houston TX, US
James Dabney - Houston TX, US
Louis Everett - El Paso TX, US
Thomas L. Harman - Houston TX, US
International Classification:
F24H 1/20
US Classification:
392449
Abstract:
A water heater () is suitable for point-of-use applications. The water heater includes a tank housing () and one or more electrically powered heating elements (). A water inlet line () and a water outlet line () may be molded as a unitary structure with the tank housing. The water outlet line includes a lower port () and an upper port () for mixing water in the outlet line. The housing may be mounted such that its axis is either vertical or horizontal.