The total energy consumption of the city. OBZhD

BASICS OF SAFE LIFE
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The total energy consumption of the city. Basics of safe life

Fundamentals of Safe Life Activities (OBZhD)

Cities serve as huge energy accumulators and emitters. Within the framework of the adopted model, it can be considered that annually a city with a million inhabitants consumes about 4,5·1015 kJ/year, or 1,5·1013 kJ/km2 per year. The last figure somewhat exceeds the amount of energy coming from the Sun at 56° N. sh.

Concentrating a large amount of energy, cities release part of it into the environment.

In the city, the air temperature is always higher than in the areas around it. This is due to both man-made activities and the heating of asphalt, concrete and stone surfaces of streets, squares, walls and roofs of houses, etc. by the sun.

In large cities with dense buildings, the air temperature can sometimes be 5 °C higher than in the surrounding area. During severe frosts in the center of a large city, the temperature is sometimes 9-10 °C higher than on the outskirts.

Authors: Aizman R.I., Krivoshchekov S.G.

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