PG25 · 25% propylene glycol
PG25 denotes a nominal 25% propylene-glycol concentration; it is not a universal direct-to-chip default or a complete fluid specification. Name the product/base fluid, percentage basis, inhibitor package, water quality, materials compatibility, operating envelope, maintenance controls, and equipment warranty.
Current numbers
~165–236 L/minHPE GB200 NVL72 coolant-flow worked example: guide water-property heat balance ~165–236 L/min for its 115 kW liquid load at a 7–10 °C rise; Clariant PG25 ~172–246 L/min at the same rise. Separate QCT rack-reference bounds: up to 45 °C liquid inlet / 65 °C liquid return.
7.5–12 °CDober PG25 planning illustration: 7.5–12 °C rise and about 1.25–2.0 L/min per kW; not a universal loop target
~1.25–2.0 L/min/kWDLC flow rule of thumb (PG25); ~7.5–12 °C coolant delta-T target across the TCS