The Biggest Risk in Liquid Cooling Is Not Whether It Leaks. It Is When.
Manufacturing, delivery, and service life: one word—“leak”—hides three clocks, three owners, and three bodies of evidence.
Liquid cooling for AI data centres
We do not make the parts.
We are responsible for the whole thermal path.
From the facility water interface to the chip there are six boundaries. Each one has a maker, a test, and a record. NextGenergy designs, integrates and commissions across all of them, and hands over the evidence.
Approach
Three ideas that run through every project.
They are not product features. They are how we decide what to build, what to test, and what to write down.
01
The thermal path has six boundaries, and no single vendor owns them all.
Cold plate, quick disconnect, manifold, CDU, facility loop, heat rejection. A leak, a fouled plate or a lost megawatt of reuse always happens at a boundary. Someone has to own the whole line.
Read →02Return-water grade is the first thing that decides whether your waste heat has a buyer.
Not the PUE. The temperature the loop returns at is the first screen for who can take the heat directly: a greenhouse, a district network, a pool, an absorption chiller. Load profile, distance and contract terms come next.
Read →03A leak is three different failures on three different clocks.
A weld that escaped the factory. A quick disconnect disturbed at commissioning. A hose that ages out in year four. Different owners, different evidence. One checkbox cannot cover them.
Read →Numbers with boundaries
A number goes out with its condition attached, or it does not go out.
Every performance figure we publish about our own work carries its test condition and its source. Reference figures and calculator assumptions carry a stated basis and a stated limit. A figure we cannot yet state that way does not appear as a headline.
≈55 °CCold-plate loops we have delivered return water at roughly 55 °C.Condition: Secondary-loop return at rated IT load; direct-to-chip cold plate; facility-side approach not included. Source: Every Watt Counts, "Waste Heat Becomes an Asset" (June 2026). Verified by: Operating logs; not third-party audited.
50–60 °CFourth-generation low-temperature district heating networks are defined by supply temperatures of roughly 50–60 °C, rising to about 70 °C in winter.Condition: Per the 4GDH definition (Lund et al., 2014: < 50–60 °C, 70 °C in winter); varies by network, season and building stock, and some ultra-low-temperature networks run below 45 °C. Source: Lund et al., 4th Generation District Heating (4GDH), Energy 2014; ScienceDirect topic review.
−40 °COur cold-climate designs are specified for ambient down to −40 °C.Condition: Design ambient for outdoor heat-rejection equipment and fluid selection; not a demonstrated continuous-operation record at that temperature. Source: NextGenergy design basis for cold-climate deployments.
Evidence
Ten places a liquid loop can leak. Ten records that should exist when it is handed over.
Most turnover packages say "leak detection installed". Ours answers three questions for every boundary: was it tested, against what acceptance criteria, and where is the record.
01Cold plate jointstested · criteria · record
02Quick disconnectstested · criteria · record
03Hose crimpstested · criteria · record
04Manifold branchestested · criteria · record
05Elastomeric sealstested · criteria · record
06Threaded and compression fittingstested · criteria · record
07CDU internal boundariestested · criteria · record
08Field welds and hot worktested · criteria · record
09Balancing and isolation valvestested · criteria · record
10Fill, drain, vent and sample portstested · criteria · record
Tools
Three engineering calculators
Return-water grade → feasible heat buyers
Enter your secondary-loop return temperature. See which off-takers can physically use the heat and which would need a heat-pump lift.
Open the tool →Approach temperature → CDU sizing
See how a few kelvin of approach across the CDU heat exchanger changes facility supply temperature and free-cooling hours.
Open the tool →Turnover self-check
Ten boundaries, three questions each. Score your last project honestly.
Open the checklist →Insights
Every Watt Counts
Long-form writing on power, liquid cooling and heat reuse for AI infrastructure. Mirrored from Substack, with links into the evidence and tools each piece points at.
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How we work
Design, integrate, commission, operate. Same team, same records.
We specify the thermal path, source and pre-assemble it with manufacturing partners, commission it against written acceptance criteria, and stay through service. We are not a component manufacturer and we do not pretend to be one. That is the point: nobody who sells one part is accountable for the line. We are, within a written scope and written acceptance criteria.
New-build AI data centre
Set the return-water grade and the acceptance criteria before the first rack lands.
Read →Retrofit
Liquid on an air-cooled floor without a chiller plant rebuild.
Read →Heat reuse and community licence
Turn reject heat into a metered product at the fence line.
Read →Cold climate
Dry heat rejection and fluid selection for design ambients to −40 °C.
Read →Bring us your project.
A new build, a retrofit, a heat-reuse scheme, or a turnover package you would like verified.