Electric heating – Heating devices – With power supply and voltage or current regulation or...
Reexamination Certificate
2006-03-14
2006-03-14
Paschall, Mark (Department: 3742)
Electric heating
Heating devices
With power supply and voltage or current regulation or...
C219S497000, C219S483000, C307S039000, C392S360000
Reexamination Certificate
active
07012223
ABSTRACT:
The present invention relates to a forced-air electric heater control system for HVAC systems. One embodiment utilizes two heat sensors which are positioned upstream and downstream, equidistant from the heating element(s). The control system, in this embodiment, takes the difference between the temperature signals, thereby eliminating any radiant heat factor, and the resulting signal is used to control the heater. In other embodiments, the method senses upstream and downstream temperatures, determines air velocity in the duct, determines the amount kilowatts (KW) or other heat per unit time or power based thereon, and enables the power control switch when the resultant is less than a predetermined value. Alternate systems initially test for air velocity by application of nominal power, and then use the measured velocity and the downstream temperature to obtain a control signal for the heater. A pressure differential may be used. The systems compensate for radiant heat factor.
REFERENCES:
patent: 1946262 (1934-02-01), Adams
patent: 2647401 (1953-08-01), Hathaway
patent: 3553431 (1971-01-01), Petersen
patent: 3560710 (1971-02-01), Fuellemann
patent: 3594546 (1971-07-01), Smillie
patent: 3641312 (1972-02-01), Ammerman et al.
patent: 3674203 (1972-07-01), McGrath
patent: 3737622 (1973-06-01), Hallgreen
patent: 4304127 (1981-12-01), Feller
patent: 4314143 (1982-02-01), Bilstad et al.
patent: 4523081 (1985-06-01), Geib, Sr. et al.
patent: 4595139 (1986-06-01), Levine
patent: 4607787 (1986-08-01), Rogers, III
patent: 4641013 (1987-02-01), Dunnigan et al.
patent: 4642441 (1987-02-01), Kenyon
patent: 4782708 (1988-11-01), Harrington et al.
patent: 4821700 (1989-04-01), Weibler et al.
patent: 4886110 (1989-12-01), Jackson
patent: 4966037 (1990-10-01), Sumner et al.
patent: 5050533 (1991-09-01), Zaber
patent: 5111527 (1992-05-01), Arold et al.
patent: 5214740 (1993-05-01), Carroll
patent: 5652826 (1997-07-01), Mills
patent: 5805767 (1998-09-01), Jouas et al.
patent: 5836693 (1998-11-01), Stulen et al.
patent: 5925321 (1999-07-01), Koyamoto et al.
patent: 6058774 (2000-05-01), Rengshausen
patent: 6176306 (2001-01-01), Gault
patent: 6431457 (2002-08-01), Dirkes, II
patent: 6440157 (2002-08-01), Shigezawa et al.
patent: 6665492 (2003-12-01), Garcia et al.
patent: 2004/0173346 (2004-09-01), Byrnes et al.
University of Cambridge, Whittle Laboratory, Department of Engineering, “Hot-Wire Anemometers,” by Howard Hodson and Robert Howell, Oct. 1, 2003.
Flometrics—Hot Wire Calibration and Measurement System, Oct. 1, 2003.
Fleit Kain
Kain, Jr. Robert C.
National Environmental Products, Ltd.
Paschall Mark
LandOfFree
Forced-air heater control system and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Forced-air heater control system and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Forced-air heater control system and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3595641