Methods and apparatus for detecting the need to defrost an evapo

Details Methods and apparatus for detecting the need to defrost an evapo Methods and apparatus for detecting the need to defrost an evapo

1989-06-12

1990-02-27

Tanner, Harry B.

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62155, 62160, F25D 2106

Patent

active

049035002

ABSTRACT:
Defrost control, and a method of determining the need for defrost, of a transport refrigeration system which includes an evaporator coil disposed in an air flow path which returns air from a served space and discharges conditioned air back into the served space. The temperature of the air in the served space is measured by a digital thermostat for comparison with a preselected set point temperature, and the refrigeration system is operated with heating and cooling cycles to cause the temperature of the air to track set point. The digital temperature signal is monitored by the defrost control during each cooling cycle, and defrost of the evaporator coil is initiated as a function of the direction and rate of change of the air temperature.

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