Abstract:

The solid desiccant heat pump system (SDHP) can handle sensible and latent heat load simultaneously with high coefficient of performance (COP). However, the sensible heat load removal capacity of this system is relatively weak and the fluctuation of supply air temperature is large due to the frequent switch of the role of two desiccant coated heat exchangers (DCHE). In this study, the concept of semi-decoupled SDHP (SSDHP) system is proposed to overcome these disadvantages. In SSDHP system, the DCHE which acts as an evaporator operates in series with a conventional evaporator, and another DCHE functions as a condenser. Experiments are conducted to demonstrate the feasibility of this novel system under ARI humid condition to provide satisfied air. Results show that the comfortable supply air of 18.36℃ (max:19℃, min:18℃), 11.67 g/kg and the COP of 4.71 can be obtained. In addition, the influences of temperature and humidity ratio of fresh air on system performance are also analyzed.