HPE GB200 NVL72 secondary-loop design flow, guide water-property heat-balance derivation for its ~115 kW liquid load at a 7–10 °C rise
~165–236 L/minderived
| Value kind | derived — Derived values are guide calculations; their result is only as fixed as the stated inputs, scope, and method. |
|---|---|
| Scope | Guide water-property heat balance for the HPE 115 kW liquid load at a 10–7 K operating rise: density 1.00 kg/L and heat capacity 4.18 kJ/(kg·K). A derived design illustration, not an OEM flow requirement. The separate QCT 45 °C inlet and 65 °C return maxima do not prescribe this rise. |
| Caveat | The operating flow must also satisfy the selected rack and CDU pressure/flow envelope. |
| As of | 2026-08 |
| Source | HPE GB200 NVL72 data sheet, Advanced Direct Liquid Cooling from HPE, p.2: 132 kW total, 115 kW liquid, 17 kW air. Guide water-property calculation. Source. · HPE PDF p.2, Advanced Direct Liquid Cooling from HPE; guide Q = mass flow × heat capacity × temperature rise |
| Derivation | 115 × 60/(4.18 × 10) = 165.0717703 L/min; 115 × 60/(4.18 × 7) = 235.8168148 L/min. Round each endpoint to three significant figures: 165 and 236. Use approved formulation properties for glycol. |
| Review | checking…review by 2026-12-22 · standard cadence |
| Recorded changes | last 2026-09-16 · 4 revisions tracked |
| Claim id | nvl72-coolant-flow-guide-derivation-1-25-2-0-l |
Where the guide uses it
- 5.4 Direct-to-Chip Liquid Cooling (DLC) — Architecture, Fluid & Thermal Design
- 5.6 CDUs & the Secondary Loop
- 5.13 Facility Piping & Pressure-System Mechanical Engineering
- 7.13 The Rack as Integration Unit
- 13.5 Cooling Acceptance: Air, Liquid-to-Chip & CDU Commissioning
← Full numbers register — every date-stamped figure in the guide, with revision history.