Fluid flow control for HVAC system with valve position readjustm

Details Fluid flow control for HVAC system with valve position readjustm Fluid flow control for HVAC system with valve position readjustm

1994-05-31

1996-03-26

Ford, John K.

Heat exchange

Movable heating or cooling surface

Rotary drum

165 34, 165 39, 165 50, 165101, 236 1B, 237 8R, F25B 2900

Patent

active

055012655

ABSTRACT:
A process is disclosed for adjusting the valve position of flow control valves which govern the flow of a heat exchange fluid to a plurality of individually controlled zones. The process resides primarily in a system controller in communication with a number of separate zone controllers. The system controller periodically obtains temperature and mode of operation information from each zone controller and thereafter computes the amount of time necessary to change the temperature by one degree in each zone. The computed amount of time per degree change in temperature is compared with the average for all zones in a similar mode of operation. Offsets are calculated for active flow control valves in each zone depending on whether the computed amount of time per degree change in temperature is above or below the average for all corresponding zones in the same mode of operation. The offsets are transmitted to the zone controllers for use in adjusting the valve positions that are to be commanded by the zone controllers.

REFERENCES:
patent: 3167113 (1965-01-01), Kleiss
patent: 3176759 (1965-04-01), Windham
patent: 3202208 (1965-08-01), Geiringer
patent: 4150788 (1979-04-01), Matsumoto et al.
patent: 4291750 (1981-09-01), Clyne et al.
patent: 4381814 (1983-05-01), Funk
patent: 4487028 (1984-12-01), Foye
patent: 4601328 (1986-07-01), Tasaka et al.
patent: 4884743 (1989-12-01), Baehr
patent: 5417368 (1995-05-01), Jeffery et al.
Hartman, "Trav--A New HVAC Concept," Heating, Piping Air Conditioning, Jul. 1989 pp. 69-73.

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