Passive rooms, green, energy-saving, and healthier

Source: Datong News Network

With China's clear goal of achieving carbon peak by 2030 and carbon neutrality by 2060, "dual carbon" has become a hot topic in the development of various industries and a key focus of long-term strategic layout.

In the process of promoting the realization of the "dual carbon" goal, real estate enterprises have transformed and upgraded one after another, reducing building carbon emissions, and promoting ultra-low energy residential buildings is urgent. As a result, passive housing has entered the public's view.

The development of passive housing is of great significance

China has a large population and a large construction market. Reducing building energy consumption is a powerful means to promote the achievement of the "dual carbon" goal in the construction industry. According to the statistics of the China Building Energy Conservation Association, from the perspective of the entire process of building material production, construction, and operation, the carbon emissions in China's construction industry accounted for approximately 50.6% of the total national carbon emissions in 2019. Among them, the carbon emissions from the production of building materials account for 28% of the national carbon emissions, the carbon emissions from construction accounts for 1% of the total emissions, and the carbon emissions during the construction operation stage account for 21.6%.

Under the "dual carbon" goal, the construction industry urgently needs to improve energy efficiency and effectively reduce carbon emissions. As an ultra-low energy building, passive housing naturally becomes the key to energy conservation in the construction field.

As a result, the country and local governments have repeatedly introduced policies related to passive buildings to promote the construction of passive houses. With the support of policies, in recent years, passive housing and a series of industries surrounding passive housing have gradually formed and developed rapidly.

Passive rooms make buildings more energy-efficient

Passive rooms, also known as passive ultra-low energy green buildings, originated in Germany and are an internationally recognized energy-saving building technology that integrates low energy consumption, high quality, and high comfort. It is to reduce the heating demand of the building to the minimum by greatly improving the thermal performance and air tightness of the envelope outside the house and using the efficient fresh air heat recovery technology, so that the building can get rid of the traditional centralized Hydronics and ensure the indoor temperature between 20 and 26 ℃.

For real estate enterprises, the proposal of the "dual carbon" goal means higher construction standards. Behind saving energy and improving comfort, passive rooms have extremely strict technical standards.

"Passive house is an enclosure structure with high efficient thermal insulation performance and higher air tightness performance, which can minimize building energy demand and reduce heat loss, thus reducing dependence on building energy and reducing building energy consumption." Yang Yudong, technical director of Datong Tairui Group, introduced the concept of passive house with simple examples in life. He said that ultra-low energy consumption The "passive" concept in passive buildings with near zero energy consumption refers to thermal energy. Just like a cup of hot water, after standing for a period of time, it will gradually cool down. At this point, people need to use energy such as electricity to heat water, which consumes energy. The same applies to the energy consumption of ordinary housing. In winter, people need heating to heat their rooms, while in summer, they need air conditioning to cool their rooms. In this way, people usually use disposable energy, which leads to energy consumption. And through passive rooms, this contradiction can be easily resolved. Passive rooms have eliminated traditional heating systems, and the heat and light energy generated by indoor people can basically meet the indoor temperature requirements in winter. Through equipment, the heat in indoor exhaust gas is recovered, significantly reducing energy demand and achieving indoor freshness and comfort like a spring breeze.

"Passive housing is not completely without active systems." President Yang said that passive housing can minimize the consumption of Primary energy through the use of renewable energy such as solar energy and thermal energy, and these systems have the involvement of "active" equipment in the design and operation. For example, after the Dedicated outdoor air system achieves the effective preservation of indoor cold and hot energy, in order to avoid blocking the indoor and outdoor air circulation, the passive rooms are installed with efficient heat recovery Dedicated outdoor air system, which can automatically adjust according to indoor carbon dioxide, temperature, humidity, PM2.5 and other indicators, and heat or cool the outdoor air inflow, so as to maximize the indoor temperature while purifying the indoor air. Compared with the energy consumption of ordinary buildings, the energy-saving rate of passive rooms is over 90%.

In today's rapidly changing urban development, green, healthy, energy-saving, and environmental protection have become the mainstay of urban development. Ultra low energy buildings, represented by passive rooms, are an innovation in the field of building energy efficiency and will inevitably become the mainstream trend in the future development of the construction industry. (Li Dongmei)