Defrost control apparatus and method for a refrigerating system
AssigneeSamsung Electronics Co., Ltd.
InventorKwang H. Yoon
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Abstract
A thermistor is mounted between the fins of an evaporator. The thermistor senses the temperature about the evaporator when a blow fan mounted at the evaporator is driven and when it halts. The two sensed temperatures are compared, so that when the difference of the two temperatures is below a first set value, a defrost operation starts. When the temperature about the evaporator is above a second set value, the defrost operation is completed.
Claims4
A refrigerating system including an evaporator, a fan for blowing air through the evaporator and a defrost heater, comprising:
- a temperature sensing means disposed near the evaporator:
- a microprocessor for obtaining a difference between a temperature sensed by the temperature sensing means when the fan is driven and a temperature sensed by the temperature sensing means when the fan is paused, said microprocessor controlling the fan, initiating a defrost operation by driving the defrost heater when the difference in temperature is less than a first set value, and completing the defrost operation by turning off the defrost heater when the temperature sensed by the temperature sensing means is greater than a second set value.
A defrost control method for a refrigerating system which periodically detects a temperature about an evaporator by a temperature sensing means mounted in a predetermined space near the evaporator and determines a defrost start time from the sensed temperatures, comprising the steps of:
- sensing at least two temperatures with the temperature sensing means, a first temperature being sensed during the driving of the fan and a second temperature being sensed during a pause of the fan;
- completing the defrost operation by turning off the defrost heater when the temperature sensed by the temperature sensing means is greater than a second set valve.
Dependencies are inferred from the claim text.