The condensate then collects in a drip pan or bucket for disposal while the now cooled air passes back over the dehumidifiers warm motor to that it is slightly reheated before being discharged back into the room. By being slightly warmed, the air exiting the dehumidifier is dry and warm - which means it will attract moisture like a magnet and maximize the dehumidifier's efficiency.

a. Simpler structure

The simple structure also contributes to a low flow resistance. The high-EF dehumidifier is really different from other modified dehumidifier, such as add an intermediate heat exchangers or pre-cooling and re-heat heat pipes.

 

b. Feature of low humidity refrigeration

“large condenser and ventilation volume” based on the above picture. The ventilation volume on evaporator is relatively lower, so the load of “sensible heat” released by evaporator, which is used to absorb cooling air, is reduced. This allows the cooling volume on evaporator is increasingly changed to absorb the heat of condensation from those vapor that passes through evaporator. 

c. Higher energy efficiency

For a normal dehumidifier specified with 5.0 L/h, its EF can reach to more than 3.5L/kWh and create the highest record among all of the similar dehumidifier under T=26.7℃（80 ℉） and RH=60% of condition, which seems 30% higher than the best performance dehumidifiers in market.

The following figure shows the comparison of refrigerant cycle between high-EF dehumidifier manufactured by Zhejiang Preair and normal dehumidifier in a pressure-enthalpy diagram. The refrigeration cycle changes from 1-2-3-4-5-6-1 to 1-2’-3’-4’-5’-6’-1. To details, the refrigerating capacity per unit mass of refrigerant increases from h1-h6 to h1-h6’, and the compressor energy consumption reduces from h2-h1 to h2’-h1. Thus, the energy efficiency is significantly improved.

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