Investigation of Heat Loss by Radiation from External Walls of Airport Buildings Depending on Different Sky Cloudiness Factor

Abstract

In the study, the sky emissivity (?sky) and sky temperature (Tsky) values were determined and the heat loss by radiation from the exterior surfaces required for the heating and cooling energy consumption calculations of the airport buildings was investigated. While the outdoor dew point is determined, the outdoor temperature and relative humidity are used. The outdoor dew point temperature value was used while calculating the sky emissivity value. When determining the outdoor sky temperature values, both sky emissivity and cloudiness factor values are used. Sky temperature is required to calculate the heat loss with radiation from the exterior surfaces of the airport buildings. Twenty cities in different climate zones around the world are selected in the study. The heat loss by radiation from the external surfaces of the airport buildings in these 20 cities has been calculated. For the 0.0 value of the completely cloudless for cloudiness factor, the highest external surface radiation heat loss difference depending on the 0.9 surface emissivity values was obtained in Moscow with 68.580 W/m2 and for the 1.0 value of completely cloudy for cloudiness factor and for the 0.5 surface emissivity value, the lowest external surface radiation heat loss difference was calculated as 8.874 W/m2 for Lisbon. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.