MDCX Reference Design
400 Immersion Cooling Container with UPS (I400C45)
I400C45SUT50
45ft 400 kW Immersion Cooling container · UPS · up to 50 kW/tank
Overview
What this SKU is: envelope, installed units, density, and the geometry you can download. Figures here are properties of the product, not of any one site.
| Item | Value | Basis |
|---|---|---|
| IT design load | 400 kW | claim C10 |
| Installed units | 8 | table MDCX immersion container specification |
| Maximum density | 50 kW/tank | claim C13 |
| Air-cooled rack load | 10 kW | table MDCX immersion container specification |
| GPU capacity | 512 | claim C11 |
| Envelope | 14,000 × 2,438 × 3,490 mm | table ISO container envelope, MDCX module geometry |
| Footprint | 34.1 m² | derived 14.000 m × 2.438 m |
| Lead time | 90 days ex-works | claim C3 |
3D views
Orthographic and section views are generated from the published module geometry for this SKU. The interactive view is read-only — this is the standard configuration, not a configurator.
Geometry and schedules
- OpenUSD reference model —
AC45.usdc.xz
System boundary
The MDCX-supplied envelope is the container. Primary (utility) and secondary (facility) electrical sides meet at the transformer. Site responsibility begins at the published electrical and water interfaces.
Interface definition only. Implementation details are not published.
Power distribution
How power is broken down and distributed inside the boundary, and what the site must present at the connection point.
IT load against plant overhead
At: USA - Pennsylvania (PJM), 34 °C, Summer peak, 100% utilization. The racks draw below the density ceiling at this GPU — 30 kW of rack headroom remains.
Plant consumers
| Consumer | Power | Share of facility |
|---|---|---|
| IT — immersion tanks | 360 kW | 76.1% |
| IT — air-cooled rack | 10.0 kW | 2.1% |
| Tank CDU pumps | 13.6 kW | 2.9% |
| Dry cooler fans | 12.4 kW | 2.6% |
| Hybrid chiller | 61.0 kW | 12.9% |
| UPS conversion loss | 7.9 kW | 1.7% |
| Distribution loss | 3.7 kW | 0.8% |
| Facility auxiliaries | 4.3 kW | 0.9% |
| Facility total | 473 kW | 100% |
Plant overhead is 102.9 kW, 27.8% of IT, for a PUE of 1.278 at this point.
Single-line topology
Single-line topology (interface definition). Protection settings are not published.
Ratings at the boundary
Ratings in this section are derived from the IT design load and the published PUE band. They size an interface; they are not measured results and are not claims-registry facts. Each derived row prints its formula.
C12 immersion PUE ≈ 1.05 is peak dry-bulb ≤ 24 °C / free-cooling only. Hot-zone PUE is not 1.05.
| Item | Value | Basis |
|---|---|---|
| IT design load | 400 kW | claim C10 |
| Facility load | 451.8–565.8 kW | derived 400 kW × PUE 1.129–1.415 |
| Connection capacity | 497–622.4 kW | derived facility load × 1.10 |
| Transformer capacity | 497–622.4 kW | derived sized to connection capacity |
| UPS capacity (IT only) | 600 kW | table MDCX power bay schedule |
| Battery backup | 20 min | table MDCX immersion container specification |
Load schedule
PDC1 (facility)
| Load | Phase | Voltage | Power kW | PF | Qty | Total kW | Current A |
|---|---|---|---|---|---|---|---|
| Tank CDU 1…8 | 3 | 380 V | 1.7 | 0.99 | 1 | 1.7 | 3.3 |
| Cooling tower 1 | 3 | 380 V | 15 | 0.8 | 1 | 15 | 35.6 |
| Cooling tower 2 | 3 | 380 V | 15 | 0.8 | 1 | 15 | 35.6 |
| Precision air conditioning | 3 | 380 V | 10 | 0.8 | 1 | 10 | 23.7 |
| Lighting | 1 | 220 V | 0.3 | 0.8 | 6 | 1.8 | 10.2 |
| Fire suppression | 1 | 220 V | 1 | 0.8 | 1 | 1 | 5.7 |
| Monitoring | 1 | 220 V | 0.5 | 0.8 | 1 | 0.5 | 2.8 |
| Fresh air | 1 | 220 V | 1 | 0.8 | 1 | 1 | 5.7 |
| Spare | 3 | 380 V | 10 | 0.8 | 1 | 10 | 32.9 |
| Total | 57.9 kW | 178.4 A | |||||
IT-PDC1 (A feed)
2N pair — one feed carries the full IT zone; they do not sum.
| Load | Phase | Voltage | Power kW | PF | Qty | Total kW | Current A |
|---|---|---|---|---|---|---|---|
| Tank 1…8 | 3 | 380 V | 45 | 0.99 | 1 | 45 | 86.3 |
| IT rack | 3 | 380 V | 5 | 0.8 | 1 | 5 | 11.9 |
| Network switches | 1 | 220 V | 2 | 0.8 | 8 | 16 | 38 |
| Total | 381 kW | 740.5 A | |||||
IT-PDC2 (B feed)
2N pair — one feed carries the full IT zone; they do not sum.
| Total | 381 kW | 740.5 A |
|---|---|
Interface definition only. Implementation details are not published.
Cooling distribution
How heat leaves the racks and reaches ambient: the loops, their design temperatures and flows, and where the plant switches from free cooling to mechanical cooling.
Heat distribution
At: USA - Pennsylvania (PJM), 34 °C, Summer peak, 100% utilization. The racks draw below the density ceiling at this GPU — 30 kW of rack headroom remains.
| Heat path | Heat | Share of IT |
|---|---|---|
| Dielectric coolant — direct immersion | 360 kW | 97.3% |
| Air — auxiliary rack | 10.0 kW | 2.7% |
| IT heat total | 370 kW | 100% |
97.3% of the heat leaves directly into the dielectric coolant; 2.7% is air from the auxiliary rack. There is no room-air cooling path to size.
Loop schematic
Loops
| Loop | Supply | Return | ΔT | Design flow | Fluid |
|---|---|---|---|---|---|
| Tank oil loop — direct immersion | 35 °C | 43 °C | 8 K | 250 L/min | Single-phase dielectric coolant |
| Primary loop — CDU to heat rejection | 32 °C | 37 °C | 5 K | 125 L/min per CDU | 25% glycol |
Heat rejection
Free cooling below the switch temperature; hybrid chiller above it
| Item | Value | Basis |
|---|---|---|
| CDU rated cooling | 800 kW | table MDCX immersion tank specification |
| CDU units installed | 16 | table MDCX immersion tank specification |
| In-row CRAH installed | TBD | TBD |
| In-row CRAH rated cooling | TBD | TBD |
| In-row CRAH fan power | TBD | TBD |
| CDU secondary flow | 2,000 L/min | table MDCX immersion tank specification |
| CDU approach | TBD | TBD |
| Pressure drop | 35–45 kPa | table MDCX immersion tank specification |
| Pipe diameter | DN50 | table MDCX immersion tank specification |
| Switch temperature | 24 °C | table MDCX heat-rejection selection rule |
Interface definition only. Implementation details are not published.
Performance
PUE, WUE, and annual energy depend on site and workload, so they are not properties of the SKU. Solve this SKU at your own site:
Basis and disclaimer
Computed numbers in this document are operating-point results for the stated city, season, workload, and utilization. They are not guarantees or SLAs. Marketed numbers live in the claims registry.
Cited claims: C3 · C4 · C31 · C36 · C37 · C38 · C39 · C10 · C11 · C12 · C13.
C12 immersion PUE ≈ 1.05 is peak dry-bulb ≤ 24 °C / free-cooling only. Hot-zone PUE is not 1.05.
Expansion block and first delivery are 90 days ex-works from receipt of down payment (C3, C4); on-site installation and commissioning 3–4 weeks (C36). Freight and customs are buyer-arranged; MDCX publishes no estimate (C39). Retired schedule and fleet-PUE claims are not restated.
Reserved items
This document publishes what a correct result looks like. It does not publish how MDCX produces it, or with what.
| Withheld | Statement |
|---|---|
| BOM, makes, models, suppliers | Bill of materials, makes, models, and suppliers are not published. |
| Control logic, alarm thresholds, tuning | Control logic, alarm thresholds, and tuning policy are not published. |
| Solver kernel | The solver kernel is not published. Operating conditions and result numbers are. |
| Manufacturing and quality path, takt | Manufacturing path, quality process, and line takt are not published. |
| Price and commercial terms | Price and commercial terms are not published. |