What is the heat island effect and what does the heat island effect mean

The urban heat island effect is one of the typical characteristics of urban climates. It is a phenomenon in which the temperature in the city is higher than in the suburbs. On the one hand, the formation of urban heat island is the heat emitted by people's daily life in modern large cities; On the other hand, the dense building complexes in the city, asphalt and cement pavements have a greater correspondence specific heat capacity (can absorb more heat) than the soil and vegetation in the suburbs, and the reflectivity is small, so that the city absorbs and stores more solar energy during the day than the suburbs, and the city cools slowly at night and the temperature is still higher than that in the suburbs.

The urban heat island is based on the city center as the center of the heat island, there is a strong warm air flow rising here, and the suburbs are relatively cold air sinking, so that the formation of the suburban circulation, various pollutants in the air under the action of this local circulation, gather in the city above the city, if there is no strong cold air, urban air pollution will be aggravated, the environment of human survival is destroyed, resulting in various diseases of human beings, and even death.

Heat Urban heat island effect.

The island is a comprehensive phenomenon of microclimate change caused by people changing the urban land surface, and is one of the most obvious features of urban climate. Due to the acceleration of urbanization, urban buildings are dense, asphalt roads and cement pavements have greater heat capacity and heat absorption rate than the soil and vegetation in the suburbs, so that the urban areas store more heat, and radiate a large amount of heat to the surrounding and the atmosphere, resulting in the temperature in the urban area is generally higher than the temperature in the surrounding suburbs at the same time, and the high-temperature urban area is surrounded by low-temperature suburbs, like islands in the ocean, and people call this phenomenon the urban heat island effect. Large cities can emit as much heat as 2 5 of the solar energy received

As a result, the temperature of the city rises, which is often referred to as the heat island effect.

The ambient temperature of the city is several degrees higher than that of the suburbs around the city, like a steaming island. That's why the city always has to feel hotter than the suburbs in the summer. The causes are directly related to buildings, air conditioners, automobiles, and human activities.

In the summer, the city also always receives less rainfall than the suburbs, which is also responsible for the fact that the clouds are forced away by the heat.

When the level of carbon dioxide or certain other gases in the atmosphere increases, it will enhance the absorption of ultraviolet rays by the atmosphere, preventing the heat from the earth's surface and increasing the earth's temperature.

Heat island effect: A phenomenon in which the temperature in one area is higher than that of the surrounding area. The hot zone in the center is like an island jutting out of the sea, so it is figuratively called a heat island.

It is a regional climatic phenomenon that has been discovered in large cities around the world since the 60s of the 20th century.

A common occurrence is the urban heat island effect.

That is, the phenomenon that the temperature in the city is higher than the temperature in the suburbs. There is also the non-urban heat island effect, such as the Tibetan Plateau.

the heat island effect, etc.

Practical application

Monolithic solar cells are generally not usable, and the actual application is solar cell modules. A solar module is a combination of multiple solar cells to achieve a desired voltage value.

During the use of solar modules, if a piece of solar cell is shaded alone, such as leaves and guano, the separately blocked solar cell will heat up under strong sunlight.

damage, so the entire solar cell module is damaged. This is known as the heat island effect. In order to prevent the heat island effect, solar cells are generally placed at an angle so that leaves and other leaves cannot attach, and anti-bird pins are installed on the solar cell modules.

The urban heat island effect is a phenomenon in which the temperature in one area is higher than that of the surrounding area. It is expressed as the difference in temperature between the two representative measurement points (i.e., the heat island intensity). There are two main types: the urban heat island effect and the Qinghai-Tibet Plateau heat island effect.

The heat island effect is a phenomenon of urban microclimate change caused by man-made changes in the local temperature, humidity, air convection and other factors on the urban surface. This phenomenon is one of the most obvious features of the city's climate.