Design Leading the Way: Green "Carbon" Solutions, China Construction Eighth Engineering Division Promotes the Lively Practice of Passive Technology

Against the backdrop of the national "dual carbon" goals

Green buildings have become an inevitable trend in urban construction and development

China Construction Eighth Engineering Division's design is innovation-driven

Leading the future with practice
 

Actively exploring and taking the initiative

Committed to creating livable, ecological, and sustainable urban environments

 

 

 

 

Practicing green and low-carbon

Eighth Bureau Design in Action

 

 

For green and low-carbon buildings, the principle of prioritizing passive design is followed. By optimizing the building's design and structure, natural resources are fully utilized to minimize energy consumption and achieve energy saving and carbon reduction effects within the building itself.

 

This issue of "Design Leading the Way" will showcase the Eighth Bureau's exploration and practice in green building technology through the application of passive technologies in outstanding demonstration projects.

 

 

 

01

 

Incorporating environmental characteristics and quality of use

Climate-Responsive Buildings

——Intelligent Integration of Natural Elements

Through careful planning and utilization of topography, adaptability to climatic characteristics, and optimization of building functional layouts, the building's responsiveness to the surrounding wind, light, and thermal environment is enhanced, achieving deep integration.

 

 

I. Optimization of Site Layout and Integration with the Surrounding Environment

The overall planning of cities and building clusters should contribute to creating a suitable microclimate. Through the rational use of topography and organic integration with landscapes and surrounding ecological greenery, natural ventilation and daylighting are fully utilized to reduce building energy consumption and carbon emissions.

 

 

Cangwu County Liubao Tea Culture Tourism

Core Area Construction Improvement Project

 

A strategy of close integration with the topography was adopted. The overall plan fully considers the relationship between buildings and the environment. Through rational building volume coefficients, layout and orientation, and organic combination with surrounding ecological greenery, natural ventilation and daylighting are effectively utilized, aiming to reduce building energy consumption and carbon emissions, and promoting the sustainable development of cities and building clusters with the natural environment.

 

 

Nanjing Gulou District 01-02 Plot

Talent Apartment Construction Project

 

The main design strategies include: 1. Following the natural terrain to minimize environmental disruption; 2. Utilizing terrain differences to create visual corridors and enhance spatial sense; 3. Introducing southeast-facing landscape resources to enhance the living experience; 4. Guiding natural wind through building design to improve the microclimate. The planning and design highlight the important role of building design technology in promoting the harmonious coexistence of buildings and the natural environment, aiming to achieve an ecological and livable living environment.

 

II. Optimization and Adjustment of Building Volume Coefficient

For every 1% increase or decrease in the building volume coefficient, the impact on building energy consumption is approximately 2.5%. On the basis of meeting building functions and aesthetics, minimizing the volume coefficient is a major design strategy for green and low-carbon buildings.

 

 

China Construction Eighth Engineering Division Talent Development

Center Project

 

Through comprehensive simulation and deduction of the building's form, the building's volume coefficient was reduced from 0.4 to 0.23 using an intensive design strategy. The compact building form not only helps improve the efficiency of natural lighting and natural ventilation, further reducing the energy consumption of lighting and air conditioning systems; it also accommodates multiple functions, saving limited land resources and reducing operating carbon emissions by about 15%.

 

III. Optimization of Building Facade, Natural Ventilation and Daylighting

The green and low-carbon design strategy for building facades is to maximize the use of natural light by rationally designing the building's orientation, window size and position, reducing the need for artificial lighting, effectively promoting air circulation and reducing reliance on mechanical ventilation systems.

 

 

Shanghai Cooperation Organization Agricultural Science and Technology

Exhibition and Exchange Center

 

In terms of building facade design, the eaves are combined with the outer colonnade to create a deep overhang, and a simple inclined glass curtain wall is used. This not only gives the building a sense of technology and modernity, but also cleverly utilizes building self-shading to optimize natural lighting effects and reduce summer energy consumption.

 

 

 

 

 

Commercial Bank of Ethiopia

New Headquarters Office Building

 

By combining building facade shape, controlling volume coefficient and window-wall ratio, and conducting comprehensive simulation analysis of indoor lighting, ventilation, and temperature and humidity environment, it is ensured that the building not only has excellent temperature regulation and lighting effects but also enjoys a broad field of vision, significantly improving building comfort.

 

 

 

 

 

Simulation analysis

 

 

 

02

 

Incorporating climate and energy use characteristics

High-Performance Envelope Design

——Material Innovation and Technology Integration

 

Compared with traditional buildings, passive technology utilizes a high-performance envelope system to minimize room energy loss.

 

 

I. High-Performance Integrated Exterior Wall Insulation Energy-Saving Technology

Heat loss through the building's exterior walls accounts for about 60% of the total heat loss. By optimizing the thermal performance of the enclosure walls, insulation and heat insulation requirements for different climates are met.

 

 

China Construction Eighth Engineering Bureau Architectural Technology (Shandong) Co., Ltd. Industrial Base R&D Center Project

 

The main body of the project adopts a BIPV photovoltaic curtain wall system. However, on the surfaces where sunlight cannot be collected, UHPC high-strength concrete slabs are used instead. The UHPC high-strength concrete slabs are meticulously combined with the keel system, insulation rock wool, etc., integrating structural stability, insulation, decoration, waterproofing, fire protection and durability into one, meeting multiple target needs.

 

II. High-Efficiency Integrated Roof Insulation Energy-Saving Technology

The key to achieving roof energy saving is the integrated use of thermal design principles and high-performance insulation materials to construct a highly efficient building envelope structure.

 

 

Jinan Central Hospital

(East District)

 

By laying vegetation on the roof and using light-colored materials with high reflectivity, the amount of solar radiation absorbed is effectively reduced, lowering the roof and indoor temperatures.

 

III. Optimized High-Performance Thermal Bridge-Free Structure Technology

Strengthening the potential thermal bridge structures in the enclosure structure, enhancing insulation and heat preservation performance, and reducing heat flow are key factors in reducing building energy consumption. These detailed improvements to the structures reflect the deepening design of green and low-carbon technologies.

 

Pudong New Area Z00-1603 unit B07-9 plot commercial and office project

 

In areas prone to thermal bridging, such as the top of parapets, the connection between the curtain wall system and the inter-floor slabs, the roof equipment foundation, the underside of the suspended floor, and the intersection with the curtain wall, the design incorporates targeted detailed insulation reinforcement for each specific area.

 

 

 

 

03

 

Combining lighting characteristics and thermal performance

High-efficiency energy-saving exterior window design
 

——A perfect combination of technology and aesthetics

 

Exterior windows are the weakest link in building energy consumption. While they account for only about 10% of the total building envelope, energy losses through exterior windows account for as much as 50% of the total building energy losses, making them crucial for building energy efficiency.

 

 

I. Reasonable Optimization of Window-Wall Ratio Balancing Energy Consumption and Lighting  

The window-wall ratio affects both the overall heat gain and loss of the building, and is closely related to the indoor lighting environment and building lighting needed for indoor functions. Considering both building energy consumption and lighting, arriving at a suitable window-wall ratio that allows the building to achieve optimal lighting effects and quality by sacrificing minimal energy consumption is key to the design.

 

Kweichow Moutai Street Renovation Project

 

Reducing the window-wall ratio reduces heat loss and effectively controls overheating in summer. Combined with the overall building envelope insulation structure of the Moutai project and the design according to the new energy-saving regulations, the thermal performance of the enclosure structure has been improved by more than 15%.

Building facade effect after optimization

 

II. Reasonable Optimization of Window Structure and Materials to Enhance Performance

Window materials and structure are key factors affecting the energy efficiency of exterior windows. In detail design, it is necessary to reasonably select glass materials and optimize the window structure, such as increasing the number and width of cavities.

 

China Science and Technology New Economic Science and Technology Park Infrastructure Project (D-6 plot)

 

Through design strategies such as heat-insulating break-bridge aluminum alloy window frames, double-silver Low-E three-layer hollow glass, inert gas argon filling, and warm-edge spacer sealing, the transparent exterior doors and windows of the Zhongke D6 project have achieved lightweight window systems and improved energy efficiency.

 

III. Flexible Application of Shading Technology Suitable for the Environment

Shading design should consider regional climate characteristics, room usage requirements, and window orientation, employing adjustable or fixed shading measures. Exterior shading can reduce solar heat gain on building surfaces by 80%.

 

Huzhou World Rural Tourism

Conference Permanent Venue

 

Each floor has carefully designed eaves in all directions, projecting 2 meters. In the corridor section, the eaves depth reaches 5.1 meters. The eaves, as a shading system, effectively reduce solar heat gain, reducing building energy consumption and significantly improving the indoor thermal and lighting environment.

 

Shanghai Lingang Science and Technology City

K01-01 plot project

 

Based on environmental analysis, combining form and function, especially for the west-facing facade, vertical shading rods were designed to reduce the impact of the west sun on the building interior. By comparing the tilt angles of the shading rods, the tilt angle of the main building's rods is opened towards the landscape side to achieve the best visual effect. The south-facing shading rods have a wider surface facing west to effectively reduce the impact of the west sun, thereby improving the building's energy efficiency.

 

 

Towards Green, Competing in New Tracks

China Construction Eighth Engineering Division uses technological innovation to lead

Passive technology + active technology, a two-pronged approach

Developing new productive forces

Promoting green and low-carbon transformation

Reprinted from China Construction Eighth Engineering Division