Nantong JinYing World Jinhui Fang A1A2 Block Project Located on the east side of No. 2 Road in Nantong City, Jiangsu Province, this is a public building designed with commercial spaces on floors 1–2 and office areas on floors 3–6. The office and commercial sections are entirely separate, each equipped with its own independent air-conditioning system and dedicated circulation corridors. The scope of this ultra-low-energy consumption project covers the office areas from floors 3 to 6, encompassing a total floor area of 35,683 m²—specifically, Plot A1 accounts for 19,188 m², while Plot A2 spans 16,495 m².

 

 

Leveraging the commercial district's riverside advantages and using the scenic river as its central axis, we create immersive experience spaces that transcend traditional design boundaries. Combined with ultra-low-energy consumption principles, this approach delivers office buildings that are healthier, more energy-efficient, more comfortable, higher-quality, and offer greater peace of mind.

 

The project employs an integrated technology that combines green building certification at the two-star level with ultra-low-energy consumption design. Compared to the "Energy Efficiency Design Standard for Public Buildings" (GB 50189-2015), the building itself achieves a 35.91% energy-saving rate, while the overall building system boasts an impressive 58.52% energy savings. This initiative is meticulously designed to create a replicable and scalable model of ultra-low-energy, green office buildings tailored for regions experiencing hot summers and cold winters.

 

 

Technical Solution

 

Excellent insulation system

 

This project employs a thicker external insulation system: the roof is insulated with 120mm-thick extruded polystyrene boards, while the exterior walls are fitted with 120mm-thick rock wool panels. Local thermal bridge and air-tightness treatments have been implemented, significantly exceeding the insulation requirements of conventional buildings and minimizing the building's heating and cooling demands to the greatest extent possible.

 

High-performance exterior windows and shading systems

 

The exterior windows feature high-performance triple-glazed, two-chamber units with a central sunshade—specifically, 6Low-e (double-silver) + 12Ar (argon gas) + 6mm + 23A (manually integrated blinds) + 6mm. While maintaining excellent visibility, these windows effectively block outdoor noise, achieving sound insulation performance that meets the stringent national standards for indoor acoustic environments. Additionally, the windows are designed to meet summer shading needs, reducing the reliance on artificial lighting and helping to conserve energy.

 

Multi-split system with high-efficiency heat recovery fresh air system

 

The project features an inverter-based multi-split system with an IPLV rating of 6.4, allowing individual temperature control in each room. The central unit automatically adjusts its operating power based on the varying cooling or heating loads of each space. Additionally, an efficient, energy-saving, and environmentally friendly total heat recovery ventilation system is employed, achieving a heat recovery efficiency of 70%. This system ensures clean, healthy indoor air by continuously exchanging stale air from exhaust vents with fresh air supplied through dedicated intake vents. During the exhaust and supply processes, the system recovers heat from the outgoing air, preheating the incoming outdoor air before it’s delivered back into the building.

 

Renewable Energy Utilization

 

A solar photovoltaic power generation system has been implemented, with photovoltaic panels installed on the rooftop, achieving an installed capacity of 312 kW.

 

Energy-saving technology

 

Enhanced building envelope performance, improved exterior window efficiency, a multi-split high-efficiency heat recovery fresh-air system, renewable energy utilization, energy-efficient lighting, variable-frequency control for elevators, and meticulous treatment of localized thermal bridges and air tightness.

 

 

 

Technological Innovation Points

 

The core concept of this project is to minimize conventional energy consumption while adopting an integrated design approach—tailored to the building’s layout, architectural design, and surrounding environment—to seamlessly adapt to and fully leverage local climate characteristics, ultimately creating a comfortable indoor thermal environment.

 

The building envelope boasts thermal insulation and heat-retention performance far exceeding national standards, along with superior air-tightness, significantly reducing heating and cooling demands.

 

Fully leverage renewable energy by adopting solar photovoltaic power systems, along with efficient lighting and variable-frequency control for elevators, to deliver a comfortable indoor environment while minimizing energy consumption.

 

By integrating green building standards of two stars with ultra-low-energy technologies, we aim to explore sustainable, site-specific solutions for ultra-low energy consumption, creating replicable and scalable green office buildings tailored to regions characterized by hot summers and cold winters.

 

 

Economic efficiency

 

The total investment for floors 3 to 6 is approximately 295 million yuan, of which about 22.049 million yuan is allocated to building envelope components related to ultra-low energy consumption—specifically, roof and exterior wall insulation, exterior windows, solar photovoltaic systems, localized thermal bridge treatments, and air-tightness measures. This translates to a unit area cost of 617.8 yuan per square meter.