Source: Beijing Daily
Original title: Without air conditioning and heating, the first “near-zero energy consumption” model building was unveiled at the sub-center by keeping the room temperature around 20 degrees Celsius throughout the year
There is no need to use electricity to blow air-conditioning in the hot summer, and there is no need for external heating in the severe cold winter. The first “near-zero energy consumption” building in the domestic energy industry will be officially put into use at the end of October 2021 in the Beijing Sub-City.
The “nearly zero energy consumption” building is located in the peak shaving heat source plant at No. 5 Hedong, Luyuan North Street. A small building contains more than 10 high-tech energy-saving new technologies such as ground-source heat pumps, air-source heat pumps, photovoltaic power generation, energy storage tanks, and full-smart sensor “outdoor curtains”, making it a veritable “energy-saving model building”. The full name of this building is “Beijing City Sub-center Smart Energy Service Guarantee Center”. It is an energy supply command and service center integrating customer service, emergency repairs, and dispatching.
5 energy storage tanks store geothermal energy, air energy, and solar energy
The “near zero energy consumption” small building has completed the main structure construction and facade decoration, revealing its true appearance. The small gray building, which seems to be no different from other buildings, is in the deep pit in front of the building, but huge orange metal energy storage tanks are buried side by side.
It turned out that ground source heat pumps and air source heat pumps were installed in this building, and the roof and curtain walls were covered with photovoltaic panels. Heat pumps “capture” geothermal energy from the underground and “absorb” air energy from the air; photovoltaic panels can generate electricity through solar energy. The energy “captured” and “absorbed” from nature is stored in energy storage tanks.
“A total of 5 energy storage tanks are buried under the ground. The stored energy can not only be converted into heating in winter to heat the entire building, but also into air-conditioning in summer to cool the entire building, and it can also store’green electricity’ for the entire building. Building power supply. Under normal circumstances, the energy stored in the five energy storage tanks can basically meet the heating and air-conditioning cooling needs of the entire building.” Beijing City Sub-center Smart Energy Service Guarantee Center nearly zero energy consumption demonstration Zhang Gucheng, director of the project office, first uncovered the secret of Xiaolou’s application of “green energy”.
Wang Jie, a staff member of the Urban Management Committee of Tongzhou District, said that compared with traditional buildings, about 60% of the energy used by the building is renewable energy.
“Padded a cotton jacket” to the house, thin walls keep warm
This “nearly zero energy consumption” small building can always maintain a room temperature of about 20 degrees Celsius “like spring in all seasons” regardless of spring, summer, autumn or winter.
“The windows, curtains, and walls are all designed with secrets. It is like putting a padded jacket on the house to achieve a good effect of passive energy saving.” Zhang Gucheng said.
Each window in the building is three times thicker than ordinary household aluminum alloy windows. It turns out that both the window frame and the glass have been specially designed. The window frame is filled with special thermal insulation materials, the rare gas “argon” is filled between the three layers of glass, and the glass surface is also coated with a special thermal insulation film. With layers of protection, the thermal insulation capacity of a window is comparable to a solid brick wall, which can minimize the energy loss caused by the exchange of hot and cold air from the outside with the room.
Outside each window on the east and south sides of the building, there are also “smart curtains” that can sense the outside weather, which can automatically open and close according to the outdoor temperature and light, and automatically adjust the shading angle of each curtain leaf.
The new technology of “dual insulation” is added to the wall, and the wall is thinner, and the insulation performance is better. It is reported that the wall has a built-in “vacuum insulation board” in the ordinary external insulation layer. With the “double insurance”, the 10 cm “thin wall” has better thermal insulation performance than the 30 cm “thick wall” in the past.
After the small building is put into use, it is estimated that there will be 120 customer service, emergency repairs, and dispatchers working in the building every day. Will the airtight building feel boring? How to keep the indoor air fresh? Cheng Kai, the person in charge of the energy system of the near-zero emission demonstration project, led a tour of the two sets of fresh air systems being installed in the building. He said: “The fresh air system operates 24 hours a day to dehumidify and purify the air to ensure that the air quality in the building is always “excellent”. ‘.”
Wang Jie said that with this series of new passive energy-saving technologies, the overall energy consumption of the entire building can be reduced by more than 70%.
The operation of the building depends on the intelligent “brain” to automatically adjust the energy
When the sun is too hot, when to draw the curtains? When the light is insufficient, when will the lights be turned on? When does the energy storage tank begin to store energy? All these instructions can be adjusted automatically in real time without the need for humans to worry about them. Zhang Gucheng said that the building is equipped with an intelligent control system that can automatically sense and recognize the external temperature, light, energy, etc., and automatically schedule the energy use of the entire building according to demand, so as to achieve the goal of high proportion of renewable energy and low carbon emissions.
Wang Jie said that the “Smart Energy Service Guarantee Center” has obtained the green building three-star design mark and the national near-zero energy consumption certification. It is also the first “near-zero energy consumption” project in the domestic energy industry. 70% will be officially put into use in the sub center at the end of October 2021. In the next step, the new technologies adopted in “near zero energy consumption” buildings are also expected to enter residential quarters and office buildings.
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“Near zero energy consumption” building
The National Technical Standards for Near-Zero Energy Buildings are gradually increasing in accordance with the level of energy conservation. Buildings are divided into ultra-low energy buildings, near-zero energy buildings and zero-energy buildings from energy consumption to production capacity. Through the application of a series of energy-saving technologies in architectural design, the house has lower energy consumption, less carbon emissions, and a better living experience. (Zhang Nan)
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