Abstract
Desiccant coated heat exchanger (DCHE) systems handling sensible and latent heat simultaneously have significant potential in improving dehumidification performance. The DCHEs consist of a series of open air channels coated with porous desiccant, and the moisture transfer occurring in DCHEs usually can be represented by one single channel due to their structural symmetry. In this study, the adsorption kinetics of an adsorber with a parallel air channel coated with three low-temperature regenerative desiccants respectively, i.e. silica gel, FAM Z01 and FAM Z05 was experimentally investigated. Their dehumidification performances in DCHEs also were simulated at regeneration temperature range of 50-80°C. Results showed that the linear driving force (LDF) model can well describe the dynamic behavior of water uptake. Adsorption rate coefficient [[EQUATION]] increased with the increase in inlet air humidity ratio and air velocity, but decreased with increasing coating thickness. It is worth noting that the increasing regeneration temperature had a little effect on the [[EQUATION]] , while desorption rate coefficient [[EQUATION]] increased significantly. Simulation results indicated that the DCOP of Z05 DCHE can reach 0.66 at regeneration temperature of 50°C, which is 2.4 and 8.9 times higher than these of silica gel and Z01 DCHEs, respectively.
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