New Construction Projects – 2024

It is also considered an important parameter for checking weather conditions and climate studies, and many agricultural, industrial and urban development activities are regulated by this parameter.

In meteorology, the air temperature of a city or a region is the air temperature measured by a thermometer in a meteorological shelter (screen box).

(Meteorological shelter or screen box is an enclosure that is installed at a height of 1.25 to 2 meters from the ground and in the direction of direct air flow and away from direct sunlight.)

In fact, the temperature recorded in the shelter is the ambient temperature that is in the shade and exposed to direct air flow.

In addition to recording and measuring the temperature, which is done at different hours by thermometers in meteorological stations. The air temperature is continuously recorded by stability thermometers and by drawing a curve and day-to-day changes, and this information can be accessed and stored in the archives of existing weather stations and used in research.

Also, in the meteorological stations, the minimum and maximum air temperature at a height of five centimeters above the ground is also recorded and measured for the study of frost and the reflection of solar energy received from the ground.

In line with agricultural meteorology, soil temperature is measured at different depths (5, 50, 30, 20, 10, 100 cm) by special thermometers prepared for this purpose.

As it is noticeable to us and the record of temperatures shows that the air temperature has daily changes. This temperature is controlled by the incoming radiation of the sun and the outgoing radiation of the earth.

When the incoming radiation of the sun exceeds the outgoing radiation of the earth, the temperature increases, and when this situation is reversed, the temperature decreases.

The minimum daily temperature occurs in the early morning (when the sun rises) and the maximum temperature occurs between 2.30 and 3 in the afternoon.

But the reaction of humans to the heat of the environment does not depend only on the temperature of the air, but it has been proven that the temperature of the air, humidity, radiation and air flow together form the thermal conditions of the environment.

In addition, in relation to the reaction of humans to the thermal conditions of the environment, all these factors should be taken into consideration.

Therefore, below is a brief description of the climatic conditions of human comfort:

One of the factors affecting human life, health and comfort is weather and climate conditions. Humans have been directly and indirectly affected by these conditions since their inception, and in turn, they have affected the climate.

This influence was much less for the early man, but the influence of today’s man has increased with the advancement of technology, excessive population growth and improper exploitation of the environment, and he faces difficulties and complex issues in his life and that of other creatures on the planet. has constructed.

Due to the significant difference of people from each other, their feelings about an atmospheric or climatic situation can be different. Therefore, no climate can be considered completely unfavorable, nor can a climate be considered completely favorable for all types of physical activity or for the health and well-being of all people.

For example, some people living in a place may feel a certain day mild and favorable, some may feel hot and unfavorable, and some may feel cool and unfavorable. Apart from individual characteristics, the type of clothing and the bioclimatic history of people are very effective in their perception of weather conditions.

In general, factors that create favorable or unfavorable conditions for humans include: surrounding air temperature, radiation temperature from the surrounding surface, air humidity, air movement, smell, dust, aesthetics, sound and lighting.

Of these, the first four are related to thermal interactions

It has a rapid effect on the relationship between humans and the environment.

All in all, it can be said that almost all the elements of the atmosphere have an effect on the feeling and comfort of humans, but the effect of some of them is quite clear and prominent, and the effect of some of them is slight and sometimes invisible, but the elements of temperature, humidity, wind and radiation have the greatest effect. have.

Considering that the effect of each of the above-mentioned four elements find meaning and meaning together with each other, the effect of them together should be taken into consideration. For example, radiation is favorable near low temperature, but unfavorable and annoying near high temperature.

The different urban structure and the different type of activity in it compared to rural areas cause air pollution and significant changes in the amount of atmospheric elements. Among the atmospheric elements, we can mention the changes in total radiation reaching the earth’s surface, which is completely affected by the amount of atmospheric darkness.

Most people express their feelings about the weather by saying that it is hot or cold.