Abstract
Nocturnal radiation is one of the effective passive cooling technologies by infrared radiation exchange between earthly surfaces and the sky. Heating ventilation and air conditioning (HVAC) systems are highly energy‐demanding and there is a need to develop alternative low‐energy means to achieve comfort. Radiative cooling reduces the electricity requirements, which normally is generated through fossil fuels, in order to run active cooling systems. During the day, this is offset by solar radiation gains on the roof; however, at night, this heat loss has the ability to cool air, as roofs can experience a temperature drop of 2–12 °C below ambient. The experimental investigation of the aluminum material and their surface colors on nocturnal cooling is presented for clear and cloudy sky conditions. The material of aluminum and black color coating are considered. Results obtained reveal that the plates' performances greatly depend on the presence of clouds in the night. The best results are obtained in a clear sky summer climate condition than in the cloudy sky condition. The net cooling rate of night sky radiation system for without and with coating on aluminum of mass flow rate 0.05 kg s−1 is near about 72.30–80.99 W m−2 for clear sky and 48.75–53.25 W m−2 for cloudy sky condition.
Highlights
IntroductionIn hot and humid climates, cooling is a necessary part of human in conventional cooling system of the majority buildings
In this paper, we have presented the comparative study of the radiative cooling potential in the clear sky condition in summer days and cloudy sky rainy climate condition
We performed our experimental work in two climate conditions as well as two different parameters like change in the emissivity of radiator by black coating and variation in mass flow rate provided to radiator
Summary
In hot and humid climates, cooling is a necessary part of human in conventional cooling system of the majority buildings. Due to huge usage of energy in buildings, it has increased burden to propose HVAC equipments and systems energy economically. These cooling systems consume great quantity of electrical power.[2] Due to global warming, the issues of climatic change occur. The usage of comfort cooling the use of night cooling system is considered. This system is identified due to its zero pollution, uncomplicated maintenance, small energy use, simplicity, and good quality interior air. The decline of conventional sources, which is near about 80% of basic energy sources,[2] and the
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
