Every critical subsystem — cold plates, sidecar CDUs, cryogenic manifolds, and silica nanofluid loops — is designed, prototyped, and assembled in Oregon. We manufacture our own infrastructure to control every variable.
Diamond Cool does not outsource its core thermodynamic architecture. Every cold plate, every manifold, every fluid circuit is designed and fabricated under direct engineering supervision. This isn't a cost decision — it's a precision decision.
Sub-ambient cryogenic cooling at -15°C to -40°C demands tolerances that off-the-shelf components cannot deliver. A 50-micron deviation in a jet impingement nozzle array changes the entire thermal profile of a 155kW rack. We achieve microscale consistency through 5-axis CNC machining, vacuum brazing, and in-house metrology — every unit verified before it ships.
We don't assemble cooling products. We manufacture thermal weapons — precision instruments designed to annihilate heat at temperatures no competitor can reach.
The cold plate is the silicon-facing interface — the single most critical thermal component in the entire stack. Diamond Cool's multi-layer micro-jet impingement cold plates are machined from C110 oxygen-free copper (99.99% purity) to maximize thermal conductivity at 391 W/m·K.
C110 OFE copper billet sourced from certified US mills. Incoming material is verified for grain structure uniformity via ultrasonic spectroscopy before CNC processing.
Micro-jet nozzle arrays (0.3mm–0.5mm diameter), fluid channels, and manifold plenums are machined on 5-axis Haas VF-series mills at BDE Manufacturing (Beaverton, OR). Tolerances held to ±10µm across a 72-GPU mounting footprint.
Individual copper layers are stacked and vacuum-brazed at 850°C in an oxygen-free atmosphere. This creates monolithic, leak-proof multi-layer assemblies with internal jet arrays that cannot be produced via casting or additive methods.
Contact surfaces are lapped to Ra ≤ 0.4µm for optimal thermal interface material (TIM) adhesion. Every unit undergoes 150 PSI hydrostatic pressure testing, flow uniformity verification, and dimensional CMM inspection before release.
The Coolant Distribution Unit is the operational brain of the system — a modular, rack-adjacent enclosure that houses pumps, heat exchangers, the LN₂ injection interface, filtration, and the programmable logic controller (PLC). Diamond Cool's sidecar CDU is not a modified HVAC unit — it is a purpose-built cryogenic thermal management skid.
Structural enclosures are fabricated by Medford Fabrication (Medford, OR) using 14-gauge powder-coated steel. All plumbing uses orbital-welded 316L stainless tubing with Parker and Swagelok quick-disconnect fittings rated for cryogenic service.
Diamond Cool's primary coolant is a PFAS-free, non-conductive silica nanofluid — a proprietary suspension of SiO₂ nanoparticles in a dielectric base oil. Unlike water or fluorocarbon immersion fluids, this fluid is inherently insulating: it can contact live GPU silicon without shorting.
Pharmaceutical-grade SiO₂ nanoparticles (20–50nm diameter) are dispersed into a synthetic ester dielectric base at controlled concentrations (0.01–0.1 wt%). High-energy ultrasonication ensures homogeneous distribution.
Non-ionic surfactants create steric repulsion between nanoparticles, preventing agglomeration over multi-year operational cycles. Zeta potential verified at ≥ ±30mV for colloidal stability.
Completed nanofluid undergoes 12+ hours of vacuum drying at 60°C to remove moisture and dissolved gases. Dielectric breakdown strength verified at >40 kV/mm before certification.
Zero water. Zero PFAS. Zero conductivity. The fluid itself is a patent-protected competitive moat — no one else ships a sub-ambient dielectric nanofluid purpose-built for direct-to-chip cryogenic contact.
The liquid nitrogen injection system is the technology leap that separates Diamond Cool from every other liquid cooling company on the planet. The LN₂ secondary loop sub-cools the silica nanofluid through a dedicated cryogenic heat exchanger, achieving chip-junction temperatures between -15°C and -40°C — impossible with water-based systems.
The injector manifold, cryogenic valves, and vacuum-insulated piping are sourced from Technifab Products and assembled in-house with orbital-welded joints. Every cryogenic joint is helium leak tested to 1×10⁻⁹ mbar·L/s — the same standard used in semiconductor fab vacuum systems.
Diamond Cool's manufacturing pipeline is designed from day one for UL 2755 certification — the industry standard for modular data center systems, including integrated liquid cooling subsystems. UL 2755:2025 specifically addresses high-density AI workloads exceeding 1MW per rack, cryogenic fluid management, and fire/safety compliance.
In parallel, all materials and processes are validated for REACH and RoHS environmental compliance — ensuring zero PFAS content, zero heavy metals, and full regulatory clearance for international deployment.
Diamond Cool's manufacturing supply chain is deliberately Pacific Northwest-concentrated — reducing logistics complexity, enabling rapid design iteration, and supporting the founder's hands-on engineering approach.
Diamond Cool is currently in the prototype and testing phase. Contact our engineering team to discuss pilot deployments, custom rack configurations, and technical specifications.
Request Engineering Consultation