Refrigeration – Automatic control – Preventing – removing or handling atmospheric condensate
Patent
2000-02-15
2000-10-31
Tanner, Harry B.
Refrigeration
Automatic control
Preventing, removing or handling atmospheric condensate
62158, 62131, 622283, F25D 2106
Patent
active
061384631
ABSTRACT:
A control system for mobile air conditioning systems for controlling the rate at which the system compressor or clutch is cycled between operational and decreased refrigerant flow, by selectively controlling the response time of certain system control signals to flow demand changes including de-icing control, from interactions between de-icing control and flow control valves, as well as system overall control. Upon the detection of an icing condition, the response of the control system is delayed to a degree to control the rate at which the capacity of the compressor can be cycled with in design limits. The delay feature allows the differential used in differentiating between icing and non-icing conditions to be significantly reduced over that required in the prior art and thereby improving the performance of the air conditioning system. Icing conditions, or the likelihood thereof, can be determined by sensing the condition of the refrigerant flow from the evaporator. In addition, the history of compressor cycling can be stored and used to prevent excessive cycling for any reason.
REFERENCES:
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patent: 3707661 (1972-12-01), King
patent: 3708998 (1973-01-01), Scherer et al.
patent: 3738119 (1973-06-01), Scherer et la.
patent: 4602484 (1986-07-01), Bendikson
patent: 5243829 (1993-09-01), Bessler
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