Design and Study of Domestic Cooling System through Roof Ventilation Assisted by Evaporative Cooling

Abstract

This study shows the evaluation of the indirect evaporative cooling system beneath the roof that aims to reduce the cooling load in buildings. As the energy demand for space cooling increases over the years, the evaporative cooler that has lower energy consumption can be a green technology for space cooling compared with air-conditioning systems. An example of an evaporative roof cooling method that is commonly used is a rooftop sprinkler system. This study emphasizes the evaluation of the performances of an indirect evaporative cooler and rooftop sprinkler system in terms of temperature reduction and cooling capacity. The modelling is done by using the sol-air temperature to estimate the solar heat gain. Then, the cooling power of each system is calculated, and finally, the indoor temperature for the respective system can be determined. The finding shows that the temperature drop for the indirect evaporative cooler is 9.2°C, whereas for the rooftop sprinkler system, it is only about 4.4°C. The simulated cooling load of the indirect evaporative cooler for this test house can go up to 49.2W.