Brief Discussion on Advantages of Passive Ultra-low-energy Buildings to Improve Environment

With the increasing requirements of living environment and home life, the texture of the building itself attracts more and more attention. At the same time, the environmental problems caused by the rapid development of society have also increased people's concern about the sustainable development of ecology.

The development of society is constantly meeting people's needs, and different types of buildings seem to be expanding people's aspirations. In this way, building can be said to be a bearing form in the encroachment of natural possessions.

Since all kinds of buildings built for people's living have broken the balance of ecology and nature, it seems that we should use buildings as the source to recover the situation.

Therefore, passive ultra-low-energy buildings came into being.

1. Passive ultra-low-energy buildings can get rid of energy dependence

There are two main factors for the increase in building energy consumption: one is the increasing number of new buildings; the other is the additional energy consumption caused by people in pursuit of a more comfortable living environment.

According to calculations, passive ultra-low-energy buildings can save at least 90% of energy compared to ordinary buildings of the same volume. These buildings can also maintain a pleasant indoor living environment, so as to get rid of fossil energy and greatly alleviate the energy shortage problem.

Taking the world's largest passive factory - Sayyas passive factory as an example, the passive plant, which covers an area of more than 20,000 square meters, saves RMB1.8 million in heating and cooling costs and reduces annual carbon dioxide emissions by 420,000 kilograms. This greatly reduces the coal consumption and greenhouse gas emissions.

2. Passive ultra-low-energy buildings can alleviate the urban heat island effect

The temperature in most cities is too high in summer, and residents cannot live without air conditioners for temperature regulation. However, with the increasing urban heat island effect (take Shanghai and Beijing for example, the urban heat island area is 7-9 ℃ higher than the normal area), and the energy consumption of air conditioners is further increased, forming a vicious circle. Passive ultra-low-energy buildings do not generate heat island effect because of their low energy consumption. If ordinary buildings in cities are gradually replaced by passive ultra-low-energy buildings, the urban heat island effect will disappear gradually, and the city's summer temperature will also decrease.

3. Passive ultra-low-energy buildings can promote the development of building energy-saving technology

Ordinary buildings cannot simply and accurately calculate energy loss due to thermal bridges and air leakage. But the closed outer envelope of passive ultra-low-energy buildings make them free of thermal bridge and air leakage, and the energy consumption brought by fresh air replacement is very easy to calculate. This also makes the energy consumption of passive ultra-low-energy buildings clear, which makes building energy-saving technologies more clearly targeted.

4. Passive ultra-low-energy buildings can reduce the coal consumption in winter

Passive ultra-low-energy buildings can maintain indoor temperatures above 20 °C in winter without using heating facilities, thus reducing the energy consumption for winter heating.

According to statistics, China's annual coal consumption is as high as 3.7 billion tons, a large number of non-renewable coal resource consumption has become a great burden, and the resulting environmental pollution is even more unbearable. Therefore, in the future city construction, green and sustainable development has become people's consensus. Passive ultra-low-energy buildings are undoubtedly more in line with China's needs due to their characteristics of consumption reduction, environmental protection, and adaptation to various climate zones.

5. Passive ultra-low-energy buildings can isolate pollution

Passive ultra-low-energy buildings can effectively isolate outdoor smog, nitrogen dioxide, ozone, mold spores and radon in soil due to their tight building envelope structure, especially the highly airtight passive windows. Air enters the room through a fresh air system with efficient heat recovery to prevent pollution. Passive ultra-low-energy buildings can isolate outdoor environmental pollution and provide people with a safe and comfortable indoor environment.

6. Passive ultra-low-energy buildings have long service life

Passive ultra-low-energy buildings make the entire structural system under protection due to their precise design, strict materials and high airtight envelope structure, avoiding outdoor environmental erosion, and providing a constant indoor environment. This kind of buildings can greatly extend the use cycle of buildings, reduce the demolition and construction loss of the short-term buildings, and reduce the loss of materials, construction waster and environmental pollution caused during construction.

It can be seen from the above points that passive ultra-low-energy buildings with their own characteristics can effectively reduce energy consumption, improve the deteriorating outdoor environment, and meet people's living environment needs with a constant indoor livable effect, thus effectively solving the contradiction between people's pursuit of a comfortable environment and reduction of energy consumption.

The passive ultra-low-energy buildings rely on passive energy, which greatly reduces active energy involvement and thus greatly reduces energy consumption. This also ensures that in the process of building use, there is a high probability of avoiding environmental pollution, changing indoor and outdoor life and the ecological environment, reducing the building's dependence on traditional energy sources, and realizing the concept of sustainable building development.