/ Center Introduction
/ Organization
/ Center Introduction
/ Organization
/ Center Introduction
/ Organization
/ Center Introduction
/ Organization
/ Center Introduction
/ Organization
/ Center Introduction
/ Organization
Thermal impact of buildings on the environment
Taiwan is narrow and densely populated, and the land use rate is quite high. Especially in cities, there are reinforced concrete buildings at a glance. Taiwan can be said to be the country with the highest density of cement buildings in the world. Humans spend 80% of their time indoors, so buildings are very closely related to humans. Since the two oil crises in the 1970s, the concept of green building sustainability began to sprout. It has been more than four years since countries around the world have actively invested in research and development. Feeling the crisis of extinction of human civilization, all aspects require that economic development must take into account the environment at the same time. , so that it can develop sustainably, actively promote the concept and policy of green building, and alleviate the damage to the ecological environment.
Although the awareness of sustainable development has been promoted for many years, at the same time, it has also seen many "hot buildings" standing in the city, and some are even under construction, which is worrying. Quite a lot of waste heat, which goes against the idea of green building. When humans move in a building, the heat emitted will increase the temperature of the 5-meter surrounding area of the building by 3 to 5 degrees Celsius (as shown in Figures 1 and 2).
In the metropolitan area, the closer the high-rise buildings are constructed, the more the "heat" generated by human activities will accumulate in the city, making the temperature of the city higher than that of the suburbs, and its isotherm is surrounded by closed concentric circles in the city center (e.g. Figure 3), making the city like a "heat island". The waste heat generated by the building forms the heat island effect of the building, which, together with the urbanization heat island effect, can increase the overall ambient temperature by 8-10 degrees Celsius. The faster and bigger the urbanization develops, the more pronounced the heat island effect will be. When the outdoor ambient temperature rises by 1 degree Celsius, the energy consumption will increase by 6%, and the energy consumption of the air conditioner will also increase by 48~60%, increasing the energy consumption. It also brings the superimposed effect of direct heat emission.
The heat emission of buildings is an inevitable procedure. It has a very serious impact on the global environment, ecology and even the climate. The total installed amount of air conditioners in Taiwan is about 25 million kW. In summer, every household uses air conditioners. Although the room is cool, However, the indoor heat is directly discharged to the outdoors, which increases the outdoor temperature and makes the surrounding environment more unbearable. The direct discharge of waste heat from air-conditioners to the outside becomes the driving force to enhance the earth's water cycle, and to promote the formation of extreme climates such as global warming and climate change, which will bring a major crisis to the survival of human beings and all things.
In Taiwan, the water that is sent to the sky by the waste heat of air conditioners does not know when it will fall there. In August 2009, Typhoon Morakot devastated southern Taiwan, causing the worst flood in the history of central and southern Taiwan. According to statistics from the Water Resources Administration, the accumulated rainfall in Sandimen, Pingtung County, reached more than 2,500 mm in just two days. Yuyou Mountain in Kaohsiung County also measured The astonishing rainfall of over 2,500 mm, the entrained rainfall is the highest in Taiwan's history with the total accumulated rainfall of 2,884 mm at the Alishan measuring station. Its 24-hour and 48-hour rainfall are 1,623.5 mm and 2,361.0 mm respectively, even approaching the extreme rainfall in the world Records (world records are 1,825mm and 2,467mm respectively). During this period, there were many floods, landslides and landslides in Taiwan. Among them, the destruction of Xiaolin Village, Jiaxian Township, Kaohsiung County was the most serious, causing hundreds of people to be buried alive.
In recent years, the water that has caused floods in Taiwan and even around the world can be determined to be caused by greenhouse gases such as carbon dioxide emitted by human activities, causing global warming, climate change, and extreme climate. After years of research, the Energy and Environmental Science and Technology Center of Qinyi University of Science and Technology believes that the greenhouse effect only prevents the "heat energy" of the earth from being released into the universe, and the source of waste heat, especially the waste heat discharge from air conditioners, is the main cause of flood disasters. One of the culprits. Reducing carbon emissions is a temporary solution, and reducing heat emissions is the most effective solution to the root cause. Therefore, in the face of disasters caused by the extreme climate of the earth, it is not only necessary to talk about "carbon neutrality", but also to talk about "heat neutrality" in order to achieve twice the result with half the effort.