In recent years, the term “passive ultra-low energy green building” has become increasingly popular. But what exactly is the secret behind this innovative technology that promises the dream of “no heating in winter and no air conditioning in summer”?
The China Construction Technology Industrial Park project, developed by China Construction Technology Hunan Co., Ltd., features prefabricated construction. The company independently designs, produces, and assembles the buildings, achieving an impressive assembly rate of 72%. This project is set to become a leading example of a passive ultra-low energy green building demonstration.
The two videos below highlight cutting-edge building technologies, focusing on “Passive Ultra Low Energy Green Buildings” constructed using BIM and prefabricated methods!
Introduction to Prefabricated and Passive Ultra Low Energy Green Buildings
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BIM Technology Application Demonstration
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What is Passive Architecture?
Passive houses are energy-efficient buildings designed using passive principles, allowing them to maintain comfortable indoor temperatures with minimal energy consumption. These buildings are environmentally friendly and offer several key features:
1. High-Performance Building Envelope
The exterior protective structure incorporates ultra-thick insulation materials, sealed on all six sides: top, bottom, left, right, front, and back. The heat transfer coefficient for the main sections of the exterior walls and roof does not exceed 0.30 W/(㎡·K).
2. Advanced Passive Windows
Windows in passive houses are engineered for exceptional performance. They feature super-insulated composite frames, and triple-pane glass with two air cavities. The glass includes double LOW-E coatings, warm-edge spacers, and is filled with argon gas, resulting in a maximum heat transfer coefficient of 1.0 W/(㎡·K).
3. Thermal Bridge-Free Construction
Thermal bridges are spots in the building envelope where heat flow is concentrated due to temperature differences between indoors and outdoors, causing heat loss and cold spots. Passive houses utilize construction techniques to eliminate thermal bridges, ensuring consistent insulation.
Key elements include:
- Excellent Air Tightness: The building must pass strict positive and negative pressure tests to minimize gas leakage. Poor sealing causes convection of warm and cold air, leading to significant heat loss.
- Efficient Ventilation System: A state-of-the-art fresh air system actively supplies high-quality air. This system features new air dehumidification and total heat recovery equipment, achieving over 75% heat recovery efficiency.
4. Renewable Energy Integration
Passive houses make full use of solar energy and ground source heat as primary energy sources for heating, ventilation, air conditioning (HVAC), and domestic hot water, promoting energy conservation and environmental sustainability.
The ground source heat pump system harnesses shallow geothermal energy, upgrading low-grade heat to high-grade heat with minimal external energy input. It is 50% more efficient than oil-fired boilers for heating and 70% more efficient than electric heating systems.
The solar-powered air conditioning system relies on solar energy and renewable biomass fuels for heating, ensuring a truly green heating solution. For cooling, it uses a small amount of electricity to leverage the ground source’s low temperature. A superconducting energy delivery system provides direct cooling, achieving highly efficient energy savings.
Article source | China Construction Fifth Engineering Bureau Third Company
Editor in Chief | Pino
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