In Suzhou, a city in the humid, cold in winter and hot in summer Yangtze River Delta region, office building central air conditioning systems must not only meet the dual needs of rapid cooling in summer and efficient heating in winter, but also must take into account increasingly stringent energy consumption standards. From the very beginning of the design, what owners and engineers are most concerned about is often"What is the optimal power per square meter?"

The power configuration of the central air conditioning system in Suzhou's office building must be considered comprehensively, taking into account factors such as floor area, spatial characteristics, usage scenarios, and system types. The following is a specific selection guide, combining industry standards and regional features:

One,Central Air Conditioning in Office BuildingCool Load Calculation Standard

Basic Formula

Total Cooling Load(kW) = Air Conditioner Area (㎡) × Unit Cooling Capacity (W/㎡) ÷ 1000

- Standard office area: 180-220 W/㎡ (inclusive of fresh air load)

Special Area Adjustments Required

  Glass Façade Area: Increased 20% Redundancy

  - Heights > 3.5 meters: Increase in cooling capacity by 10%-15%

  - Conference Room/Data Center: 300-400 W/㎡ (due to high occupancy and equipment heat generation)

2. Regional Cooling Load Reference

Regional Type |Cooling Load Index (W/㎡)|Description|

Standard Office Area (Interior)Interior without exterior walls or fewer windows; Cooling Load: 170–220 W/㎡

Standard Office Area (Outer Zone) Next to the exterior wall or glass curtain wall, cooling load:220–240 W/㎡

Management Office, high requirements for temperature control, cooling load:220–250 W/㎡

Conference Room, calculated by per capita cooling capacity and equipment heat dissipation, cooling load:280–330 W/㎡

Corridor/ Atrium, low traffic areas, chilled load: 90-180 W/㎡

Two,Central Air Conditioning in Office BuildingDetermining the Total Power Output of the Main Unit

1. Chosen Main Unit Selection Criteria

-Small office buildings (<5,000 sq. m.): Calculate the main unit cooling capacity at 200 W/sq. m.

- Large office buildings (>5,000㎡): Calculate the main unit cooling capacity at 170-180 W/㎡ (considering simultaneous use coefficient).

- Recommended number of hosts: ≥ 2, with each serving as a backup and capable of handling partial loads, for example:

  If the total cooling capacity required is 1500 kW, you can choose 2 units of 750 kW or 3 units of 500 kW.

2. Concurrent Coefficient Adjustment

Actual total cooling capacity of the main unit Calculate total cooling capacity multiplied by the simultaneous use coefficient (usually 0.7–0.8).

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- 10,000 square meters of office space, unit cooling capacity of 200 W/sq. meter translates to a theoretical cooling capacity of 2,000 kW.

- The corrected main unit cooling capacity: 2000 kW × 0.75 = 1500 kW.

ThreeCentral Air Conditioning in Office BuildingSpecial Consideration in Suzhou Region

Climate Adaptation

Suzhou experiences a hot summer and cold winter climate with high humidity in the summer. Suggestion:  

- Select units with strong dehumidification capabilities (such as those with independent temperature and humidity control systems).

Glass curtain wall buildings require an increased cooling capacity for the western exposure area (an increase of 20% based on the baseline value).

2. System Type Impacts Power Output

- Water-cooled chillers: Maximum efficiency (COP 5.0–6.0), suitable for large-scale projects, but requires cooling tower space.

- Air-cooled chillers: Easy installation, COP around 3.0-4.0, suitable for medium and small buildings.

- Multi Split (VRV): Flexible zoning control, high part-load efficiency, ideal for office buildings with multi-level leasing.