ThermoFluidCalc Engineering Report

Data Center PUE & Thermal Cooling Analysis — 2026-08-23 20:51:16
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🖥️ 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.

⚡ Fortran 90 Engine Double Precision (IEEE 754) ✓ ISO / ASME Validated
📊 Solver Telemetry ● ACTIVE
👁️ Consultations 37
⚡ Calculs faits 31
💾 Téléchargements 374 📦 Code Fortran 4.4 KB
📅 Mise en service Jun 2026
⏱️ Latence < 1 ms
⚡ Outils & Rapports :
💾 Télécharger Fortran 90

🖥️ Data Center Server Rack Cold/Hot Aisle Thermal Airflow

Real-time visual simulation of perforated floor tile cold supply & hot exhaust ceiling return

📝 Configuration & Presets

☁️ Hyperscale CAC (PUE 1.18) 🏢 Enterprise HAC (PUE 1.42) 🏛️ Legacy Open Aisle (PUE 1.87) ⚡ 2.5 MW AI GPU Cluster
⚡ Facility Power & IT Load Breakdown
Servers, storage, switches
Chillers, CRAH, CRAC, pumps, towers
🌡️ Thermal Management & Containment
Standard: 11°C to 16°C (20°F to 30°F)
ASHRAE TC 9.9 Recommended: 18°C to 27°C
The Green Grid & ASHRAE TC 9.9 Formulations:
• PUE = Ptotal / PIT (DCiE = 1 / PUE × 100%)
• Airflow: CFM = (1756 · PIT,kW) / ΔTrack,°C
• Volumetric Flow: Q = CFM × 1.699 [m³/h]
• Return Air Index: RAI = (Treturn − Tsupply) / (Track,out − Tsupply)

📊 Efficiency & Airflow Results

📊 Output Summary
💾 Fortran Source

Power Usage Effectiveness (PUE)
PUE = 1.867
🚨 Low Efficiency / High Overhead (PUE > 1.75)
DCiE = 53.6 %
Required Total Airflow 58,533 CFM 99,448 m³/h
Total Facility Power Draw 560 kW IT: 300 kW + Overhead: 260 kW
Specific Airflow Demand 195.1 CFM/kW ΔTrack = 9.0 °C
Return Air Index (RAI) 65 % Open Aisle

📈 PUE vs Cooling Infrastructure Power (kW)

📉 Required Airflow (CFM) vs Server Delta T

=================================================================
 THERMOFLUIDCALC — 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   : 🚨 Low Efficiency / High Overhead (PUE > 1.75)
Cold / Hot Aisle Temp      : 18.0 °C / 27.0 °C (ΔT = 9.0 °C)
Required Facility Airflow  : 58,533 CFM (99,448 m3/h)
Specific Airflow Demand    : 195.1 CFM/kW
Return Air Index (RAI)     : 65.0 %
=================================================================

📘 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 $c_p = 1.006\,\text{kJ/(kg·K)}$.
  • ASHRAE TC 9.9 thermal envelope A1/A2 recommended operating ranges.