Planning tool
Server room cooling and power
Almost all the power a server draws leaves as heat. This sizes the cooling for it, with growth and a standby unit.
Result
Heat to remove
7.7kW
6.4 kW today, plus 20% growth
Cooling capacity
2.2TR
26,122 BTU/h
Cooling units
3× 7 kW
2 working + 1 standby
Load per rack
2.5kW
IT supply current
29A
Single-phase 230 V, pf 0.9
Cooling electrical input
2.6kW
Assuming a cooling efficiency (COP) of 3
- Good:Use precision (24×7, 365-day rated) cooling, not comfort split units, for rooms that run all year. Cooling units should be on their own protected power.
Method
How the numbers are worked out
Heat
IT load plus UPS and distribution losses, lighting (20 W/m²), 100 W for each person, and an allowance for the building envelope, then raised for growth.
Units
The design heat is divided by the cooling unit's capacity and rounded up, plus one standby unit if you choose N+1. 1 tonne of refrigeration (TR) is 3.517 kW.
Supply
Current at 230 V single-phase or 415 V three-phase, at 0.9 power factor.
Assumptions and limits
- Cooling capacity of a unit falls with outdoor temperature and altitude; the data sheet's rating at your design conditions decides.
- Heat from sunlit walls and external air leakage depends on the building. A site survey replaces the allowance.
- Humidity control, fire suppression and leak detection are separate design items.
Related
Nothing you type here leaves your device unless you choose to send it to us. These are planning estimates; a survey or the equipment data sheet confirms the final figures.
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