Abstract
Widely used vapor-compression heat pump system can provide both heating and cooling capacity, considering it cannot realize humidification and efficiency of condensation dehumidification is relatively low. In this paper, a fresh air humidification and dehumidification system based on desiccant coated heat pump is established. In which the condenser and evaporator of the heat pump system are replaced by desiccant coated heat exchangers. By using the 4-ventilation valve, the system is very compact. The feasibility of humidification and dehumidification of the system has been theoretically analyzed. The performance of the system under GB Shanghai summer conditions and GB winter conditions is experimentally verified. The results show that the system can realize dehumidification and humidification in summer and winter efficiently and the COP under these two conditions is 5.16 and 5.06 respectively. The dehumidification and humidification rates of the system in the two chosen conditions are 2.99 L h−1 and 1.99 L h−1 respectively. The results also show that under Shanghai summer conditions, by changing the compressor frequency, the system can get a dehumidification of 2.40 L h−1 to 3.05 L h−1 with a COP of 7.80 to 3.56. The optimized switchover period is 6 min.
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