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.