ThermoFluidCalc Engineering Report

Data Center PUE & Thermal Cooling Analysis โ€” 2026-09-26 22:24:04
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๐Ÿ–ฅ๏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.

โšก Fortran 90 Engine Double Precision (IEEE 754) โœ“ ISO / ASME Validated
Data Center PUE & Cooling Hvac
๐Ÿ“Š Solver Telemetry โ— ACTIVE
๐Ÿ‘๏ธ Views 37
โšก Solves 31
๐Ÿ’พ Downloads 453 ๐Ÿ“ฆ Fortran Code 4.4 KB
๐Ÿ“… Released Jun 2026
โฑ๏ธ Latency < 1 ms
โšก TOOLS & REPORTS:
๐Ÿ’พ Download Fortran 90

๐Ÿ–ฅ๏ธ Data Center Server Rack Cold/Hot Aisle Thermal Airflow

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

๐Ÿ“ Configuration & Presets

โ˜๏ธ Hyperscale CAC (PUE 1.18) ๐Ÿข Enterprise HAC (PUE 1.42) ๐Ÿ›๏ธ Legacy Open Aisle (PUE 1.87) โšก 2.5 MW AI GPU Cluster
โšก Facility Power & IT Load Breakdown
Servers, storage, switches
Chillers, CRAH, CRAC, pumps, towers
๐ŸŒก๏ธ Thermal Management & Containment
Standard: 11ยฐC to 16ยฐC (20ยฐF to 30ยฐF)
ASHRAE TC 9.9 Recommended: 18ยฐC to 27ยฐC
The Green Grid & ASHRAE TC 9.9 Formulations:
โ€ข PUE = Ptotal / PIT (DCiE = 1 / PUE ร— 100%)
โ€ข Airflow: CFM = (1756 ยท PIT,kW) / ฮ”Track,ยฐC
โ€ข Volumetric Flow: Q = CFM ร— 1.699 [mยณ/h]
โ€ข Return Air Index: RAI = (Treturn โˆ’ Tsupply) / (Track,out โˆ’ Tsupply)

๐Ÿ“Š Efficiency & Airflow Results

๐Ÿ“Š Output Summary
๐Ÿ’พ Fortran Source

Power Usage Effectiveness (PUE)
PUE = 1.420
โœ… High-Efficiency Modern Enterprise (PUE โ‰ค 1.45)
DCiE = 70.4 %
Required Total Airflow 73,167 CFM 124,310 mยณ/h
Total Facility Power Draw 710 kW IT: 500 kW + Overhead: 210 kW
Specific Airflow Demand 146.3 CFM/kW ฮ”Track = 12.0 ยฐC
Return Air Index (RAI) 96 % Hot Aisle Contained

๐Ÿ“ˆ PUE vs Cooling Infrastructure Power (kW)

๐Ÿ“‰ Required Airflow (CFM) vs Server Delta T

=================================================================
 THERMOFLUIDCALC โ€” DATA CENTER PUE & COOLING REPORT
=================================================================
Case Title                 : Modern Enterprise Data Hall (PUE ~ 1.40, Hot Aisle Chimney)
IT Server Equipment Power  : 500.0 kW (70.4 %)
Cooling Infrastructure     : 150.0 kW (21.1 %)
UPS & Transformer Losses   : 45.0 kW
Lighting & Aux Power       : 15.0 kW
TOTAL FACILITY POWER       : 710.0 kW
-----------------------------------------------------------------
POWER USAGE EFFECTIVENESS  : 1.420
DCiE Efficiency Metric     : 70.42 %
Energy Efficiency Rating   : โœ… High-Efficiency Modern Enterprise (PUE โ‰ค 1.45)
Cold / Hot Aisle Temp      : 22.0 ยฐC / 34.0 ยฐC (ฮ”T = 12.0 ยฐC)
Required Facility Airflow  : 73,167 CFM (124,310 m3/h)
Specific Airflow Demand    : 146.3 CFM/kW
Return Air Index (RAI)     : 96.0 %
=================================================================

๐Ÿ“˜ 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.