2022 Volume 39 Issue 1 Pages 61-
A crossflow desiccant coated heat exchanger (CF-DCHE) driven by temperature swing adsorption based on direct hot water heating and evaporative cooling utilizing residual hot water was experimentally investigated. The time-averaged amount of dehumidification was examined as a key performance indicator while varying the primary operating parameters, including the cooling air velocity, process air velocity and regeneration/dehumidification cycle switching time. The results indicate that the adsorption outlet air humidity was decreased while the minimum humidity at the beginning of the adsorption period was decreased as the cooling air velocity was increased. After a certain period of time, the evaporation of water proceeded at a high rate and isothermal conditions were approached as adsorption progressed. The data also show that dehumidification performance was significantly affected by both the cooling air velocity and the cycle switching time. At shorter cycle switching times, the cooling air velocity had an effect on the time-averaged amount of dehumidification, but this phenomenon disappeared at longer cycle times under the present test conditions. When using the optimal switching time, the time-averaged amount of dehumidification increased along with the process air velocity in the case that cooling air was supplied.
