Rack density sets requirements for electrical distribution, cooling delivery and service access. Liquid cooling changes the heat-removal path, but does not erase facility constraints.
Separate installed peak capacity from average IT load. State the energy boundary and period for PUE. Check water temperatures, residual air cooling, redundancy and maintenance with the facility team.
Evidence to bring
- Measured or assumed IT load
- Cooling-water supply and return conditions
- Electrical headroom and maintenance access
Record the test conditions and the person responsible for validating the result. Resolve the largest uncertainty before treating this as a deployable design.
PRIMARY SOURCES · CHECKED 9 NOVEMBER 2026
Lenovo: Neptune liquid cooling →Undated product page; checked 2026-11-09 · Vendor portfolio description. Heat-capture and savings claims depend on configuration and baseline.
LBNL-hosted Green Grid: PUE examination →2012, version 6 · PUE = total facility energy / IT energy within the same boundary and period. Does not measure useful scientific output.