Chapters authored
Heat and Mass Transfer of a Decoupling Cooling System: A Desiccant-Coated Heat Exchanger and a Dew-Point Evaporative Cooler
This study presents an innovative de-coupling cooling technology where latent and sensible cooling loads are handled separately by a desiccant-coated heat exchanger (DCHE)-based dehumidifier and a dew-point evaporative cooler (DEC). The DCHE first removes the moisture of humid outdoor air by adsorption process. Subsequently, the DEC sensibly cools down the dehumidified air, maintaining the humidity ratio. Their performances are investigated numerically by analyzing the heat and mass transfer. The cyclic average outlet values of DCHE are applied to the inlet conditions for DEC simulation. Comparison between the simulation results and the experimental data was carried out and showed good agreement and a similar trend with a maximum discrepancy of 8.6% for DCHE and 3.2% for DEC, respectively. Key results revealed that moisture removal capacity (MRC) and latent cooling capacity (QL) for DCHE are largely affected by varying air dry-bulb and air wet-bulb temperatures, while the almost constant COPth was observed regardless of the variation of temperatures. For the DEC, the higher dew-point effectiveness and wet-bulb effectiveness were observed at the higher dry-bulb temperature and higher humidity ratio, while the higher sensible cooling capacity was observed at the higher dry-bulb temperature and lower humidity ratio.
Part of the book: Heat Transfer