Answer to Question 1
A compression cycle dehumidifier is an air conditioner with a single blower that moves air first over the evaporator, and then over the condenser. The air first passes over the evaporator where it is cooled to dew point to remove water, and then the same air passes over the condenser where it is reheated to a temperature slightly above its original temperature because of the heat of the compressor and fan motor.
Answer to Question 2
They cool the air before it enters the evaporator, so that the evaporator operates at a lower temperature, increasing the dehumidification effect of the coil. The heat that was removed from the air entering the coil is added back to the air leaving the evaporator. In effect, the air is reheated using heat taken from the air itself.
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