Data Center Cooling Planner
Trace IT load to heat, cooling capacity, airflow, waterflow, redundancy and energy with explicit PUE/WUE boundaries.
Engineering example
For 1 MW IT load, sensible fraction 1.0, ΔT = 10 K and ρ = 1.2 kg/m³, mass flow = 1,000,000 / (1006 × 10) ≈ 99.40 kg/s and volume flow ≈ 82.84 m³/s. PUE 1.4 and three 500 kW units: cooling capacity is 1 MW and N+1 is met. Chilled-water flow uses the composed water balance on total heat.
Method & limitations
Annual IT energy (kWh) = IT kW × hours × load factor. Annual water (L) = WUE (L/kWh IT) × annual IT energy; m³ = L / 1000. Boundary: IT equipment energy over the entered hours and load factor. Facility energy stays IT × entered PUE and is not the water denominator. This does not change cooling-load, airflow or chilled-water formulas, and it is not a measured cooling-plant water balance. PUE and WUE are boundary metrics, not cooling-efficiency metrics. No fabricated certification is claimed.
Formulas, source and scope
IT heat = IT load and is the sensible heat. Total heat = IT heat / sensible fraction. Latent residual = total − sensible and is not turned into airflow. Mass flow = sensible heat / (1006 J/(kg·K) · ΔT). Volume flow = mass flow / ρ, with ρ default 1.2 kg/m³. Cooling capacity = total heat. Water flow, when requested, uses the chilled-water engine on total heat. Facility power = IT power × entered PUE. Annual facility kWh = facility kW × hours × load factor. Annual IT kWh = IT kW × hours × load factor. Annual water L = WUE (L/kWh IT) × annual IT kWh; m³ = L/1000. Water boundary is IT equipment energy, not facility energy.
Formula source: site methodology / engineering assumption in this repository. No standard edition is pinned for this tool.
FAQ
What airflow matches 1 MW, sensible fraction 1 and 10 K?
Mass flow is 1,000,000 / (1006 × 10) ≈ 99.40 kg/s. At ρ = 1.2 kg/m³ the volume flow is about 82.84 m³/s. The mass flow is not a cubic-metre flow.
Does PUE measure cooling efficiency?
No. In this engine PUE is facility power divided by IT power, using the PUE value you enter.