Abstract
Objectives: To investigate heat transfer characteristics of nocturnal cooling system in the Indian climate with suitable material for radiator and proper coating to enhance the heat transfer. Methodology: A nighttime radiative cooling system with aluminum radiator in a dry area, is assessed both experimentally and theoretically. A theoretical model has been proposed to evaluate the radiative cooling potential for the dry type climate of Western Maharashtra, India. However, the end result can be improved by a nighttime cooling system based on nocturnal longwave radiation, which cools the air below ambient temperature. Findings: The experimental room temperature could be maintained at about 2- 4.50C less than the outer room temperature. It is found that there is a huge scope in reducing the energy requirements for cooling purposes. Average radiative cooling rate of 55.84 - 71.88 W/m2 is achieved for without coating and 72.30 - 80.99 W/m2 for coating on the radiator. Novelty: In this study, we have designed and assessed the radiative cooling system which has a possibility of reducing the power using up for space cooling purposes. For achieving the building healthier and more comfortable, the building design is a key factor for saving energy and reducing emissions by considering nocturnal cooling design principles with suitable design and materials. The design of energy-efficient and sustainable buildings is important for the future. Keywords: Radioactive cooling; nocturnal cooling; unglazed collector; flat-plate collector
Highlights
The phenomena of worldwide warming and the decrease of non-renewable energy sources have encouraged long-drawn-out consideration towards energy use
There are available records that reveal about the system studied for different climates of different countries but there is no record of a systematic study for Indian climate
The building design is a key factor for saving energy and reducing emissions through passive solar heating and cooling design principles and using the correct materials and suitable design tools
Summary
The phenomena of worldwide warming and the decrease of non-renewable energy sources have encouraged long-drawn-out consideration towards energy use. Very few researches are conducted to analyse the effects of the combined active and passive cooling methods on the enhancement of heat transfer rate, and it is an appropriate time to carry out work on this new approach. These facts motivate us to do research with greater emphasis on the different materials for radiators with a suitable coating to improve the heat transfer. When the temperature of night is cold building structure gets cooled either by natural or conventional way causing the formation of colder thermal mass for the day This method has been investigated by various studies. Conventional cooling methods, that utilize an enormous amount of energy with a major carbon footprint in pollution, is replaced by daytime radiative cooling which is emerging as a passive and environmentally friendly cooling approach. [2]
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