Abstract
The influence of an evaporator economizer and liquid subcooler on the operating parameters and performance of a heat pump dehumidifier has been measured in a pschyrometic calorimeter under a range of operating conditions. The results show that the enhancement in drying capacity and efficiency is most significant at low relative humidity (RH). At RH = 25% the specific moisture extraction rate of the test system was increased by 50%, and the rate of condensate formation increased by 65%, when both the economizer and subcooler were used. These increases were limited by the thermal effectiveness of the economizer which was typically 25%. The effectiveness of the subcooler was approximately 75%.
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