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D

Damper

a typical gear to obstruct two section operates by actuator

Defining

to find the possible reasons for a solution

Defrost

melting the ice frozen on the cooling coils

Dehumidification coil

a typical cooling coil in which chilled water flow and the humid in the ait passing around condensate

Dehydrator

a typical silica to absorb the water in the liquid refrigerant

Differential pressure switch

a typical electric device to operate on and off when pressure exits the set value

Dryer

a device to absorb the moisture in the liquid refrigerant