Refrigeration – Automatic control – Preventing – removing or handling atmospheric condensate
Patent
1991-10-25
1993-02-16
Tanner, Harry B.
Refrigeration
Automatic control
Preventing, removing or handling atmospheric condensate
62155, 622284, F25D 2100
Patent
active
051860163
ABSTRACT:
A defrosting control method for an air conditioner wherein when the frost amount of an outdoor heat exchanger becomes an allowable value or more during a heating operation, a defrosting operation is performed for defrosting the outdoor heat exchanger. A time period is calculated which is required for a room temperature to reach a preset temperature after the start of the heating operation by an inverter running at one of a predetermined plurality step of frequencies, in accordance with an environmental condition data. A frost amount of the outdoor heat exchanger is calculated in accordance with the environmental condition data, under the condition that the inverter runs for the calculated time period. There is selected an inverter output frequency from the plurality step of frequencies, the inverter output frequency allowing each of the calculated amounts to take the allowable value or less, the allowable value being determined as a level indicating the defrosting operation is unnecessary. The inverter or air conditioner is operated at the selected output frequency.
REFERENCES:
patent: 5065593 (1992-05-01), Dudley et al.
Kabushiki Kaisha Toshiba
Tanner Harry B.
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