Air conditioning control system

Refrigeration – Automatic control – Of external fluid or means

Patent

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Details

622592, 165 803, 236 78D, 361691, F28F 700

Patent

active

054676070

ABSTRACT:
An air conditioning control system monitors the temperature in the vicinity of electronic equipment using one or more sensors placed either in the equipment area or at the outlet of an air conditioning duct or vent. The temperature sensors supply signals to a microprocessor that is programmed to adjust the output of a system controller such that the amount of cooling provided by the air conditioning system is controlled. Illustratively, when the air conditioning system is restarted after a power failure, the power applied to one or more air conditioning fan motors is controlled, such as by throttling the motors down to an acceptable speed, to in turn control the cooling effect on the equipment. The amount of cool air produced by the air conditioning system is detected by the sensors, thereby forming a feedback control loop. Using this arrangement, electronic equipment failures which occur because of thermal shock due to air conditioning start ups after cooling system outages are reduced, by lowering the rate of temperature change to which electronic equipment is exposed.

REFERENCES:
patent: 2979596 (1961-04-01), Karp
patent: 4736594 (1988-04-01), Pao
patent: 4744408 (1988-05-01), Cordino, Jr. et al.
patent: 5021763 (1991-06-01), Obear
patent: 5102040 (1992-04-01), Harvey

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