Performance analysis of a novel household water purification system based on humidification-dehumidification principle

摘要

In order to avoid frequent cleaning and replacement of filters in the household membrane filtration water purifiers, a novel household water purification system based on the Humidification-Dehumidification (HDH) principle was proposed in this work. A heat pump (HP) unit was utilized in the system for both heating and cooling the closed circulating air. Experimental investigation was conducted by simulating annual working conditions of different water inlet temperatures (5 to 25 degrees C). The performance parameters including system operating conditions, power consumption, water production rate and pure water production per unit energy consumption were analyzed. The results showed that the system performance parameters had a close relationship with the water inlet temperature. The higher water inlet temperature would lead to larger power consumption but greater pure water production rate with a maximum of 692 g/h. The pure water production per unit energy consumption firstly rose and then declined with decreasing the water inlet temperature and reached a maximum of 1996.5 g/(kWh) at 15 degrees C. The pure water production rate of this system was not less than 580 g/h, which could meet the needs of general household drinking water, and the removal rate of the total dissolved solids (TDS) was up to 97%.