Abstract
The objective of this study was to provide the thermal comfort by means of passive cool solar reflective materials which have a high solar reflectance and high thermal emittance on the existing roof and thereby reducing the consumption of electrical energy. Experiments were performed by using locally available solar reflective materials to insulate the roofs. In this work, the thermal performance of concrete roof and asbestos sheet roof with and without insulation has been analyzed by performing experiments to existing buildings. The results are verified by computer simulation using Computational Fluid Dynamics tools with FLUENT software. The result of using solar reflective paint with high reflective coating shows a fall of 4.8°C in peak hours and saves 303 kWh when considering an energy load with an air conditioner in the summer season, in comparison to non-insulated pitched and flat roof energy loads of residential buildings in Bhopal. An optimum solution of an insulator for both types of roofs is presented. The application is intended for low-rise or medium-rise residential buildings in a subtropical climate like Bhopal.
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