๐ฅ๏ธ Data Center PUE & Cooling
Compute Data Center Power Usage Effectiveness (PUE), DCiE, server rack CFM airflow demand per kW, and cold/hot aisle containment thermal metrics per ASHRAE TC 9.9.
โก Fortran 90 Engine
Double Precision (IEEE 754)
โ ISO / ASME Validated
Hvac
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Released
Jun 2026
โฑ๏ธ Latency
< 1 ms
๐ฅ๏ธ Data Center Server Rack Cold/Hot Aisle Thermal Airflow
Real-time visual simulation of perforated floor tile cold supply & hot exhaust ceiling return๐ Configuration & Presets
โ๏ธ Hyperscale CAC (PUE 1.18)
๐ข Enterprise HAC (PUE 1.42)
๐๏ธ Legacy Open Aisle (PUE 1.87)
โก 2.5 MW AI GPU Cluster
The Green Grid & ASHRAE TC 9.9 Formulations:
โข PUE = Ptotal / PIT (DCiE = 1 / PUE ร 100%)
โข Airflow: CFM = (1756 ยท PIT,kW) / ฮTrack,ยฐC
โข Volumetric Flow: Q = CFM ร 1.699 [mยณ/h]
โข Return Air Index: RAI = (Treturn โ Tsupply) / (Track,out โ Tsupply)
โข PUE = Ptotal / PIT (DCiE = 1 / PUE ร 100%)
โข Airflow: CFM = (1756 ยท PIT,kW) / ฮTrack,ยฐC
โข Volumetric Flow: Q = CFM ร 1.699 [mยณ/h]
โข Return Air Index: RAI = (Treturn โ Tsupply) / (Track,out โ Tsupply)
๐ Efficiency & Airflow Results
๐ Output Summary
Power Usage Effectiveness (PUE)
PUE = 1.867
๐จ Low Efficiency / High Overhead (PUE > 1.75)
DCiE = 53.6 %
Required Total Airflow
58,533 CFM
99,448 mยณ/h
Total Facility Power Draw
560 kW
IT: 300 kW + Overhead: 260 kW
Specific Airflow Demand
195.1 CFM/kW
ฮTrack = 9.0 ยฐC
Return Air Index (RAI)
65 %
Open Aisle
๐ PUE vs Cooling Infrastructure Power (kW)
๐ Required Airflow (CFM) vs Server Delta T
================================================================= THERMOFLUIDCALC โ DATA CENTER PUE & COOLING REPORT ================================================================= Case Title : Legacy Raised Floor Uncontained Data Center (PUE ~ 1.85) IT Server Equipment Power : 300.0 kW (53.6 %) Cooling Infrastructure : 210.0 kW (37.5 %) UPS & Transformer Losses : 40.0 kW Lighting & Aux Power : 10.0 kW TOTAL FACILITY POWER : 560.0 kW ----------------------------------------------------------------- POWER USAGE EFFECTIVENESS : 1.867 DCiE Efficiency Metric : 53.57 % Energy Efficiency Rating : ๐จ Low Efficiency / High Overhead (PUE > 1.75) Cold / Hot Aisle Temp : 18.0 ยฐC / 27.0 ยฐC (ฮT = 9.0 ยฐC) Required Facility Airflow : 58,533 CFM (99,448 m3/h) Specific Airflow Demand : 195.1 CFM/kW Return Air Index (RAI) : 65.0 % =================================================================
๐ Calculation Methodology & ASHRAE TC 9.9 Standards
Power Usage Effectiveness (PUE)
The global standard benchmark metric defined by The Green Grid comparing total building facility power to IT mission-critical computing load:
PUE = Ptotal / PIT = 1 + (Poverhead / PIT)
Aisle Containment & Airflow Balance
Containment eliminates hot air recirculation and cold air bypass, allowing supply air temperatures to rise to $24^\circ\text{C}-27^\circ\text{C}$ to maximize chiller free cooling.
Key Engineering Assumptions
- Air density $\rho = 1.18\,\text{kg/m}^3$ at data hall operating elevations.
- Specific heat of air $c_p = 1.006\,\text{kJ/(kgยทK)}$.
- ASHRAE TC 9.9 thermal envelope A1/A2 recommended operating ranges.