Sustainable cooling system for Kuwait hot climate combining diurnal radiative cooling and indirect evaporative cooling system

This study investigates the performance of a hybrid passive cooling system that combines a hydronic radiative cooling (RC) panel integrated with a cross-flow dew-point indirect evaporative cooler DPIEC equipped with a closed cycle water reclamation using air-water harvesting (AWH) system. The study was performed on a typical residential house located in the hot and mostly dry climate of Kuwait. The house hourly cooling load was calculated using the transient simulation software TRNSYS. A mathematical model integrating the hydronic RC panel and the DPIEC models was developed and simulated to predict the system operation over the cooling season. The integrated hybrid system's performance was compared with two systems: i) the DPIEC unit standalone, and ii) the conventional cooling system, while focusing on the role of the RC system. It was found that the use of the RC panel's power during nighttime and daytime reduced the water consumption of the DPIEC unit by an average of 44.2% in comparison to that of a DPIEC unit operating alone during the cooling season. Moreover, a significant reduction of 53.4% in the electrical energy consumption was achieved by hybrid system compared to a typical AC system during the entire cooling season in Kuwait.