Investigation of Heat Loss by Radiation and Convective from External Surface of Airport Buildings

Abstract

AbstractIn this study, radiation and convective heat loss were calculated from the exterior surfaces of airport buildings in 20 different cities in different climatic zones of the world, depending on the outdoor conditions. Firstly, for radiation heat loss, sky emissivity (εsky) and sky temperature (Tsky) are calculated. While calculating the sky emissivity value, the outdoor dew point temperature value is used, and when determining the outdoor sky temperature values, both sky emissivity and cloudiness factor values are used. Secondly, convective heat loss was calculated by using the average outdoor temperature and wind velocity values. The convective heat loss calculation from the exterior surfaces of the airport buildings was calculated with both forced and free convective heat loss. Convective heat loss to be used is determined depending on the Gr/Re2 ratio. Finally, by summing both radiation and convective heat loss, total radiation and convective heat loss were determined. As a result, the highest total radiation and convective heat loss were found in Moscow, the capital of the Russian Federation, with 166.511 W/m2. The lowest total was calculated in Lisbon, the capital of Portugal, at 37.690 W/m2.KeywordsRadiation heat lossEmissivitySky temperatureConvective heat lossAirport buildings