EFFECT OF THE COLOR AND TYPE OF EARTH SURFACE ON MANIFESTATION OF A HEAT ISLAND IN BIG CITIES
Journal Title: Вестник Харьковского национального автомобильно-дорожного университета - Year 2019, Vol 85, Issue
Abstract
Problem. The urban heat island effect is well known today and has already been recorded in many cities of the world. It manifests itself in raising the temperature inside the city in comparison with the surrounding country-side site for several hours a day. The main ways to improve the microclimate of big cities is to increase greenery and water basins, and also use cold colors. However, these methods are practically impossible to apply, due to the lack of sufficient space in the city centers to adequately improve heat transfer. Therefore, one of the best methods for evaluating design decisions is a preliminary mathematical modeling. Goal. The goal is to study the influence of the surface type and color on the heat island effect in big cities, for example, Kharkiv. Methodology. The results are obtained on the basis of a numerical solution of the mathe-matical model that includes the equations of air movement taking into account heat transfer and a model of solar radiation. Results. As the calculations have shown, asphalt cov-erage of the ground increases the value of the average surface temperature of not less than 5 . Thus, the main way to deal with the urban heat island effect is to change the asphalt albedo, for example, covering with a special “cold” coating with a low albedo. The influence of heat flow from buildings in the winter period is analyzed. The calculation is made for conditions without buildings insulation and with one. The building insulation affects the temperature distribution, but this effect is insignificant and does not exceed 1..2 . Non-consideration of solar radiation results in a significant error in determining the air temperature and surface temperature during the winter period as well. Originality. For the first time in Kharkiv the manifestation of the urban heat island effect and the influence of surface albedo on it has been studied. Practical value. The obtained results can be used in the development of projects to fight this effect and to allow lowering the temperature in the city and improve the quality of citizens’ life.
Authors and Affiliations
A. Rogovyi
Keywords
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- EP ID EP647489
- DOI 10.30977/BUL.2219-5548.2019.85.0.34
- Views 117
- Downloads 0
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