Refrigeration – Automatic control – Of external fluid or means
Patent
1980-05-19
1983-08-09
Wayner, William E.
Refrigeration
Automatic control
Of external fluid or means
62332, 165 16, F25B 2500, F25B 2900
Patent
active
043971571
ABSTRACT:
An internal space air conditioning system includes supply and return ducts communicating with the internal space, a blower circulating air through the ducts and space and a refrigeration unit having evaporator cooling coils located in the air path proximate the blower suction end. The return duct communicates with the ambient atmosphere by way of a louver type damper and thermostats are disposed in the internal space and the atmosphere, and are each actuated and deactuated respectively when the corresponding temperature exceeds and is below a preset value, the external set value being at least 10 degrees F. less than the internal set value. A control network is provided to fully close the damper, actuate the refrigeration unit and energize the blower when both thermostats are actuated, fully open the damper, deactuate the refrigeration unit and energize the blower when the internal and external thermostats are respectively actuated and deactuated and deactuate the refrigeration unit and de-energize the blower when the internal thermostat is deactuated. With an open damper and energized blower the ratio of return air to externally drawn air is about 1:1.
REFERENCES:
patent: 2258021 (1941-10-01), Locke
patent: 2332730 (1943-10-01), Kucher
Miskin Howard C.
Sure Air Limited
Wayner William E.
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