In data centers and various machine rooms, precision air conditioning systems maintain constant temperature and humidity."The Cooling Wonder," also known as the "Humidity Manager." Choose wisely, and your servers will run in the "comfort zone" of 22°C ±2°C and 55%RH ±5% year-round; choose incorrectly, and you may face overheating crashes, static discharges, and disk platter condensation at any time. Below, we distill years of project experience into a practical guide, helping you navigate the selection process step by step.
OneWe have a clear grasp on our assets.
Don't rush to view the equipment samples; first, return to the site.
What are the dimensions of the room? Is there a suspended floor?
2. Is the wall insulation effective? Are the windows and doors double-glazed?
Are there any fresh air ducts or fire exhaust outlets?
4. How many more server racks are expected to be added over the next three years?
These issues determine the baseline for subsequent cold capacity calculations and ultimately decide whether you choose air-cooling or water-cooling.
How to Calculate Cooling Capacity? Remember...The "Break" Secret
Total cooling load = equipment heat dissipation + envelope load + human loadLighting and fresh air loads, multiplied by a safety factor of 1.2.
Example: OneA 250 sqm data center with 50 servers, each consuming 600W, generates a heat output of 30 kW; the protective structure, estimated at 250 W/sqm, adds another 62.5 kW; plus lighting, maintenance staff, and fresh air infiltration, the total is approximately 92.5 kW; multiplying by 1.2, a total cooling capacity of around 110 kW is the safest choice.
Hint: Experience Points400 W/m² is only for rough calculations; never use it to make a final decision for bidding.
What about air-cooled or water-cooled? See"Three Key Elements"
Installation Cycle: Air-cooled systems can be powered on within two weeks, while water-cooled systems require at least two months.
2. On-site Conditions: Can a cooling tower be placed on the rooftop or outdoor platform? Does the property management allow for wall holes to route cooling water pipes?
3. Operations Team: Do we have a certified water treatment engineer? If not, just stick with air-cooled.
Small to Medium-Sized Server RoomsAll systems with a total cooling capacity of ≤200 kW are recommended to use air-cooled precision air conditioners with temperature and humidity control; for large or campus-level data centers, consider chilled water systems.
Four: Air Distribution: Bottom air supplyFloating Floor Remains the Trendsetter
Floor Height≥30 cm separation, cold and hot air channels isolated; cabinets face-to-face and back-to-back, the return air temperature drops immediately by 2 ℃. If it's not possible to lay flooring on-site, you can opt for "upward air supply + hood," but definitely implement secondary air duct guidance; otherwise, the front cabinets will be exposed to cold air, while the rear ones will be subjected to exhaust fumes.
Precision and redundancy must be included in the technical terms.
Temperature:22°C ± 2°C; Humidity: 55%RH ± 5%
Filter:≥ H11 grade, upgradeable to H13.
Noise:≤65 dB(A), no ear-ringing on night duty
Redundancy:N+1 starts, budget ample goes for 2N directly.
Group Control: Prohibit simultaneous humidification or dehumidification of three units, to save energy.Over 10%.
Six, Brand and After-Sales, Don't Be..."The 'Low Price' Captivity
International Leaders: Vertiv, Schneider Electric, Emerson, Siemens Industry Software
Domestic Leaders: Yingwei, JialiTu, Huawei, Yimikang
Key Considerations: Does the local area have a parts warehouse?7x24-hour on-site commitment? Is the compressor a mainstream model? Can the main control board program be remotely upgraded? Including these in the contract is more valuable than cutting 5% off the price.
Seven: The Four Most Overlooked Things in the Implementation of Construction Drawings
Outdoor unit landing platform can support ≥1.5 times the unit's weight, preventing installation on the exterior wall.
When the single-length copper tube is greater than 30 meters, a bend with a larger radius must be added and refrigerant must be supplemented.
3. Condensate pipe slope ≥1%, fully insulated to prevent summer "rainfall".
4. Reserve fire alarm interface; when gas fire extinguishing is activated, the air conditioning must be automatically shut down and the air valves closed.
