Project Case | Detailed Explanation of Green and Low-Carbon Technology Application of China Construction Eighth Engineering Bureau

Promote national policies on green buildings and building energy efficiency, report on leading concepts and advanced technologies in building energy efficiency, land saving, water saving, material saving, environmental protection, and operation and management, disseminate and promote new technologies, processes, and materials for green buildings, and introduce domestic and international green building projects.

Introduction

 

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As an important part of the national strategy to accelerate the development of new productivity, the green and low-carbon development of buildings has become an inevitable trend in the development of the construction industry. China Construction Eighth Engineering Bureau has conducted multi-faceted explorations in the field of green and low-carbon building design through passive strategies integrated with buildings and active strategies that fully utilize technological innovation.

Among them, located in China Construction Green Industry Park— China Construction Eighth Engineering Bureau Talent Development Center (Shandong) and China Construction Eighth Engineering Bureau Green and Low-Carbon Building Technology Laboratory are typical representatives of building-integrated passive strategies and active strategies using technological innovation, respectively.

Let's take a look at what green and low-carbon technologies these two buildings have! ————————————————

 

China Construction Eighth Engineering Bureau Talent Development Center (Shandong)

The China Construction Eighth Engineering Bureau Talent Development Center (Shandong) is a comprehensive building independently designed, constructed, and operated by China Construction Eighth Engineering Bureau, integrating office, training, food and accommodation, and exhibitions. We intend to integrate low-carbon technologies into the building itself through design methods, and reduce energy consumption and carbon emissions during the construction and operation process through passive measures of building design itself. The following are low-carbon technologies applied to the China Construction Eighth Engineering Bureau Talent Development Center (Shandong) project:

 

01

Body Shape Coefficient Control

somatotype coefficient control

Through a comprehensive simulation and demolition of the building's shape, the design strategy reduces the body shape coefficient from 0.4 to 0.23, controlling it to the utmost, minimizing the building's heat exchange surface. The compact form accommodates multiple functions, saving limited land resources and reducing operating carbon emissions by approximately 15%.

 

02

Ventilated Courtyard

ventilated courtyard

Drawing inspiration from traditional architecture, the design allows the building to embrace nature. Courtyards are incorporated into the building to provide natural lighting for the interior spaces, reducing the use of artificial light sources; at the same time, the courtyard space forms air convection with the surrounding building space through lateral openings, allowing the interior space to achieve natural ventilation, effectively improving the microclimate of the building environment and enhancing people's natural experience in the building.

 

03

Building Self-Shading System

building self shading system

By analyzing the use scenarios of the building in different seasons and the solar altitude angle of the region, it was decided to adopt horizontal shading in south-facing rooms to avoid direct sunlight in summer and increase indoor heat radiation; in winter, the solar altitude angle can just shine into the room, providing sufficient heat for the interior. In west-facing rooms, the design adopts baffle shading to reduce the impact of west-facing sunlight in summer, reducing air conditioning energy consumption while creating visual blockage to ensure the privacy of the interior space, achieving harmonious unity between low-carbon technology and building function.

 

04

Integrated Insulation and Decoration System

integrated insulation and decoration system

Compared with the traditional construction method of cast-in-place construction of the exterior wall, the design team innovatively adopts a prefabricated fair-faced concrete insulation and decoration integrated system on the apartment facade. Compared with the traditional cast-in-place method, the use of prefabricated and modular methods can achieve carbon reduction of about 40% over the entire life cycle, effectively achieving energy saving and emission reduction of the building.

 

05

Low-e Glass

Low-e glass

This project uses low-emissivity Low-e glass in apartments and classrooms, which can retain indoor heat in winter and reflect far-infrared heat radiation in summer, preventing heat from entering the room. Compared with ordinary glass and traditional building coated glass, it saves about 40% energy compared to ordinary double-glazed glass.

 

06

Solar Coupled Hot Water System

Solar coupled hot water system

A "non-powered pressurized solar collector" and a "once-heated air-source heat pump unit" coupled system are set up on the roof of the apartment building to prepare domestic hot water, which can reduce carbon emissions by an average of 51.2 tons per year.

 

07

Intelligent Building

Intelligent Building

Multi-dimensional intelligent systems make the building smarter. The intelligent lighting system used inside the building can adjust the brightness of the lights according to the usage scenario, reducing lighting energy consumption. Intelligent meetings, smart guest control, and intelligent news release systems improve the overall operation and maintenance of the building and various meetings.

 

 

The China Construction Eighth Engineering Bureau Talent Development Center (Shandong) introduced passive design concepts in the design and planning stages, integrating low-carbon thinking into the entire process of design, construction, and operation and maintenance, and naturally and harmoniously integrating green technologies into the building. Since its completion, it has become a model for passive buildings and has won many honors, including the Shandong Provincial Excellent Design Award, the Jinan Municipal Surveying and Design First Prize, and the Shanghai Architectural Society Architectural Creation Nomination Award.

 

 

China Construction Eighth Engineering Bureau Green and Low-Carbon Building Technology Laboratory

Against the backdrop of the comprehensive promotion of carbon peak and carbon neutrality goals, near-zero energy buildings and zero-carbon buildings have become the future development trend of buildings. The China Construction Eighth Engineering Bureau Green and Low-Carbon Building Technology Laboratory uses near-zero energy consumption as its design standard, and the design energy consumption level is reduced by more than 65% compared to the national GB50189-2015 Standard for Energy-Efficient Design of Public Buildings; it combines active and passive solar design strategies and prefabricated construction methods, and simulates various usage scenarios to provide effective use carriers for the research and testing of various green technologies.

 

01

Thermal insulation system & Multifunctional integrated ultra-high performance concrete light steel keel composite exterior wall

Thermal insulation system &Multi functional integrated ultra-high performance concrete light steel keel composite exterior wall

 

By utilizing the "quilt effect," the overall heat transfer coefficient of the exterior walls is reduced to 0.19 W/(㎡·K), and the roof heat transfer coefficient is reduced to 0.12 W/(㎡·K). Through high-performance insulation measures for the exterior walls and roof, the house forms a "temperature-locking" space similar to an insulated box, significantly reducing the disturbance of outdoor temperature changes on the indoor thermal environment, maintaining stable indoor temperature, and achieving warmth in winter and coolness in summer. The building's exterior facade uses a multi-functional integrated ultra-high-performance concrete light steel keel composite exterior wall. This wall panel is a cement-based enclosure wall panel that integrates structure, insulation, decoration, waterproofing, fire protection, and durability. Through the research and development of thermal break structures and connectors, it significantly reduces the cold and hot bridge problems of traditional wall panels, improves energy-saving weak areas, achieves high energy efficiency, can achieve multi-functional synergy of the exterior walls, meets multi-objective needs, and is one of the key exterior wall components of the "14th Five-Year Plan" national key research and development project "Multi-functional Integrated Cement-based Enclosure Structure System." It is suitable for ultra-low energy consumption and (near) zero-energy consumption buildings in severely cold, cold, hot summer and cold winter, and hot summer and warm winter regions. In addition, A-grade graphene high-efficiency energy-saving insulation materials are used. The thermal conductivity of the material is as low as 0.025 W/(m·K), and the thickness of the insulation layer can be reduced by about 40%, which can significantly reduce the wall thickness.

 

 

02

Stereoscopic Solar Energy

Stereoscopic solar energy

The design team innovatively adopted a composite stereoscopic solar energy system to test the power generation efficiency of different types of solar energy. The south-facing exterior wall uses a BIPV photovoltaic curtain wall, organically combining photovoltaic components with the building's enclosure structure. ‌ Making the photovoltaic panels the building's facade, ‌ forming a unique "building expression." The south side of the parapet wall uses PVT photovoltaic thermal integration technology, which will be used to verify the comprehensive utilization efficiency of solar photovoltaic and thermal energy. BAPV distributed single-sided and double-sided monocrystalline silicon photovoltaic panels are installed on the roof to compare and analyze the power generation efficiency of double-sided and single-sided photovoltaics. The total installed capacity of the entire stereoscopic solar energy system can reach 24.3 KW, with an annual power generation of about 22200 KW·h, which can cover the building's annual energy consumption and achieve zero-carbon operation of the building.

 

03

Light storage straight and soft

Light storage straight and softSolar photovoltaic, Energy storage, Direct current and Flexibility

The design incorporates light storage straight and soft technology. By setting up energy storage devices, flexible power adjustment devices, DC lighting fixtures, and charging piles as end-use devices, it forms a closed loop from energy generation to use together with solar photovoltaics. Through the application of this technology, the utilization rate of solar energy is significantly improved. Photovoltaic power generation can be directly used in DC lighting, charging piles, and other terminal equipment, avoiding energy loss caused by the conversion in traditional AC power distribution systems. ‌ At the same time, by combining energy storage and flexible interaction technology, the volatility of the power system is reduced, ensuring the stable and reliable power supply.

 

04

Ground Source Heat Pump

Ground Source Heat Pump

The building uses a buried pipe ground source heat pump composite system for heating and cooling. The buried pipe heat exchangers are arranged in the outdoor green space around the building. Each four wells are connected in series, and the U-shaped pipe branches are directly connected to the junction boxes. They use water as a medium to extract heat from the stable geothermal source, bringing excellent energy-saving effects, more than 20% energy saving compared to traditional water systems.

 

05

Modular Air Conditioning Unit

Modular Air Conditioning Unit

The air conditioning terminal uses a heat recovery modular air conditioning unit + VAV variable air volume module, passive cold beam, cold radiant ceiling, and fan coil unit, forming various forms of air conditioning terminals. Based on energy saving and consumption reduction, it achieves a comparison of the operating effects and energy consumption of various system forms, truly realizing the combination of zero energy consumption and experimental composite scene buildings.

 

06

Fuel Cell

fuel cell

In addition to traditional energy storage devices, the building also adds a hydrogen fuel cell to test the energy supply efficiency and stability of chemical energy. The hydrogen fuel cell generates energy and water through the oxidation of hydrogen fuel, with no pollutants produced throughout the process, making it one of the most environmentally friendly green energy sources currently available.

 

07

Smart Management Platform

Smart Management Platform

The laboratory has built a customized smart management platform that visually displays the operating status of all equipment in the building in three dimensions. It also processes and analyzes the operating data of various equipment in the building, enabling research on corresponding control strategies for building energy consumption status, achieving all-weather monitoring, and effectively improving energy efficiency.

 

 

Compared with the passive design strategy of the China Construction Eighth Engineering Division Talent Development Center (Shandong), the China Construction Eighth Engineering Division Building Green and Low-Carbon Technology Laboratory's design allows the building to actively put on a "technological coat." While enhancing the building's own insulation and heat preservation performance, it fully utilizes solar energy, geothermal energy, wind energy, and other energy forms, innovates the energy transmission methods of electromechanical equipment and end-use devices, improves energy utilization efficiency, and serves as a demonstration project to provide practical experience for the future comprehensive realization of zero-carbon buildings.