Method and apparatus for fan control to achieve enhanced cooling

Details Method and apparatus for fan control to achieve enhanced cooling Method and apparatus for fan control to achieve enhanced cooling

1991-03-28

1992-04-07

Tanner, Harry B.

Automatic temperature and humidity regulation

Ventilator type

Electrically actuated

236DIG9, 165 40, 361384, F24F 700

Patent

active

051020408

ABSTRACT:
Enhanced cooling of electronic equipment (14) within an enclosure (10) is obtained by prescribing the relationship between the maximum allowable temperature difference .DELTA.T.sub.m between the exhaust and inlet air temperatures T.sub.e and T.sub.i versus the actual inlet temperature. Once a relationship between the maximum allowable temperature difference .DELTA.T.sub.m versus inlet temperature T.sub.i has been established, then each fan (22) which draws air through the enclosure is controlled so that the fan's speed is increased when the actual temperature .DELTA.T exceeds the maximum allowable temperature difference .DELTA.T.sub.m by a predetermined tolerance factor. In this way, factors such as increased heat load in the enclosure (10), diminution of the air flow therethrough, as well as an increase in the inlet air temperature, are taken account of in the control of fan speed.

REFERENCES:
patent: 4126269 (1978-11-01), Bruges
patent: 4352349 (1982-10-01), Yoho
patent: 4659290 (1987-05-01), Kundert
patent: 4667480 (1987-05-01), Bessler
patent: 4722669 (1988-02-01), Kundert
patent: 4756473 (1988-07-01), Takemae et al.
Control Resources, Inc., sales catalog (date unknown).
Cambridge Aeroflo Inc., Application Notes, Airflow Switches Series, 300, Apr. 1988.
"Trends in Electronic Hardware & the Importance of Precision Temperature Measurement", S. Madhavan, I&CS, Jun. 1989.

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