Control apparatus for refrigerated cargo container

Details Control apparatus for refrigerated cargo container Control apparatus for refrigerated cargo container

1988-12-01

1989-10-24

Wayne, William E.

Refrigeration

Processes

Compressing, condensing and evaporating

62217, 236 78C, F25B 4104

Patent

active

048753416

ABSTRACT:
A method of closely controlling the supply air temperature delivered from an air conditioning unit into a mobile cargo container wherein the supply air temperature is compared to a desired set point temperature and a suction control valve in the air conditioner compressor inlet line is adjusted in response to the sensed difference between the supply air temperature and the set point temperature. Three different preprogramed control modes are available which are selected automatically in response to the amount of deviation between the compared temperatures that are used to bring the supply temperature down the set point temperature and hold it under steady state conditions within .+-.0.25.degree. C. of the set point. A trim heater is placed in the supply air passage to warm the supply air any time the control valve is in a full closed position. This increases the heating load on the unit so that operating time of the unit will be prolonged and the compressor will not be cycling ON and OFF.

REFERENCES:
patent: 4547977 (1985-10-01), Tenedini et al.
patent: 4787554 (1988-11-01), Bartels et al.

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