Abstract
Simulation study of thermal performance of enclosures located at Roorkee, India, on a typical peak summer day with exposure on one side, revealed that the indoor environmental temperature in rooms having an exposed roof with low reflectivity remains above the outdoor air temperature throughout the day. Provision of a heat reflecting coating on walls enhancing their reflectivity from normal value of 0.5 to 0.7 does not result in any significant benefit in respect of reduction in indoor environmental temperature. However application of these coatings on the roof helps bring down the indoor environmental temperature during daytime. In rooms with a fully shaded roof, the indoor environmental temperature is reduced by about 1°C and duration of the excessive indoor environmental temperature is being lower than the respective outside air temperature is also enhanced. Shading of the roof reduces the discomfort degree hours significantly. The provision of night ventilation contributes towards amelioration of the indoor thermal environment during late night hours but the benefit accruable on the following day is insignificant compared to the reduction in indoor environmental temperature produced due to application of heat reflecting coatings on the exposed surface or shading of the roof.
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