Immersion cooling

Fluid-immersion cooling: cabinets, TANKs and CDUs

A complete single-phase immersion platform: the pre-commissioned 10 kW FO-ILC cabinet in 6U and 13U, modular ATH immersion TANKs from 13U to 54U of submerged space, and coolant distribution units from 5 to 400 kW, reaching site PUE of about 1.1.

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Overview

What this range delivers

Servers run submerged in dielectric mineral oil with up to 1000× the volumetric heat capacity of air. A 1+1 hot-standby pump pair switches over in under 2 seconds, a Siemens PLC handles control and Modbus TCP telemetry, and the liquid-to-air heat exchanger runs at a whisper-quiet 42 dB(A). Beyond the integrated cabinet, prefabricated stainless-steel TANKs assemble with flanges only, YDC group control networks up to 32 units from one 10.1-inch touch screen, and two-phase FC-72 architectures are proven at 100-unit project scale.

1000× heat capacity

Direct immersion carries heat from CPUs, GPUs and memory into the coolant with no server fans at all.

1+1 redundant pumps

Hot-standby pump architecture with automatic switchover in under 2 seconds and duty rotation to equalize wear.

PLC + Modbus TCP

Siemens S7-200 SMART PLC with SCADA/BMS integration, level sensing, leak and flow alarms, power-failure memory.

Safe dielectric coolant

Mineral oil with breakdown voltage above 40 kV: non-conductive, non-toxic, high ignition point.

The range

One immersion platform, three building blocks

Integrated · 10 kW

FO-ILC integrated cabinets

Pre-commissioned 6U (860 × 720 × 1200 mm) and 13U (900 × 758 × 1200 mm) cabinets with the full 10 kW thermal capacity, 1+1 pumps and Siemens PLC control.

TANK · 13U to 54U

ATH immersion TANK units

Modular single-phase tanks with even inlet/return flow-path design, from 13U to 54U of submerged space and up to 1250 L full-load volume.

CDU · 5 to 400 kW

Coolant distribution units

Nine CDU sizes transfer heat from the coolant loop to facility water, from 5U rack modules to full cabinets, integrable with the TANK.

System detail

Fluid-immersion cabinet: main specifications

Parameter	Specification
Heat exchange capacity	10 kW (rated)
Cooling principle	Single-phase, fully immersed liquid cooling
Coolant	Dielectric-grade mineral oil; qualified for silicone, synthetic and select fluorinated liquids
Coolant breakdown voltage	>40 kV
Supply / return temperature	40 °C / 50 °C
Minimum flow rate	≥30 L/min
Pump configuration	2 × circulation pumps, 1+1 hot-standby, failover <2 s
Control	Siemens S7-200 SMART PLC, Modbus TCP, 7″ touch HMI
Fan system	2 VFD fans, 5000 m³/h total, speed modulated to inlet temperature
Noise level	≤42 dB(A) at 1 m
Wetted materials	SUS304 stainless steel + FKM seals; all-stainless 100 μm filter
System pressure rating	10 bar
Input power	380 V AC, 3-ph + PE, 50/60 Hz
Operating environment	0 to +40 °C, 10 to 90% RH non-condensing, up to 1000 m altitude
Reference standards	IEC 60950-1, IEC 61000-4, YD/T 1437, GB/T 2423, RoHS, REACH
FO-ILC-06U-10K dimensions	860 × 720 × 1200 mm (6U)
FO-ILC-13U-10K dimensions	900 × 758 × 1200 mm (13U)

TANK units

ATH immersion TANK: per-model detail

Parameter	ATH13R	ATH21R	ATH42R	ATH54R
Available space	13U	21U	42U	54U
Phase form	Single-phase	Single-phase	Single-phase	Single-phase
Return liquid temperature	35 to 50 °C	35 to 50 °C	35 to 50 °C	35 to 50 °C
Main power supply	220 V 1-ph 50 Hz	380 V 3-ph 50 Hz	380 V 3-ph 50 Hz	380 V 3-ph 50 Hz
Inlet / return pipe	DN25 to DN80	DN25 to DN80	DN25 to DN80	DN25 to DN80
Applicable coolants	Fluorinated, mineral, silicone, synthetic oils	Fluorinated, mineral, silicone, synthetic oils	Fluorinated, mineral, silicone, synthetic oils	Fluorinated, mineral, silicone, synthetic oils
L × W × H	1000 × 770 × 1270 mm	1600 × 770 × 1270 mm	2000 × 770 × 1270 mm	2500 × 770 × 1270 mm
Net weight	240 kg	390 kg	800 kg	800 kg
Full-load volume	360 L	600 L	1250 L	1250 L

CDU range

CDU coolant distribution units: per-model detail

Parameter	CDU005	CDU020	CDU080	CDU200	CDU400
Heat transfer	5 kW	20 kW	80 kW	200 kW	400 kW
Secondary rated flow @1 bar	8 L/min	35 L/min	140 L/min	320 L/min	650 L/min
Nozzle size (in/out)	DN25	DN32	DN40	DN65	DN80
Format	450 × 850 × 220 mm (5U)	450 × 850 × 350 mm (8U)	600 × 1200 × 2000 mm cabinet	600 × 1200 × 2000 mm cabinet	800 × 1200 × 2000 mm cabinet
Net weight	40 kg	95 kg	300 kg	470 kg	600 kg
Pipe material	304 stainless steel	304 stainless steel	304 stainless steel	304 stainless steel	304 stainless steel
Filtration (primary / secondary)	50 to 100 μm / 25 to 50 μm	50 to 100 μm / 25 to 50 μm	50 to 100 μm / 25 to 50 μm	50 to 100 μm / 25 to 50 μm	50 to 100 μm / 25 to 50 μm
Communication	Modbus / SNMP	Modbus / SNMP	Modbus / SNMP	Modbus / SNMP	Modbus / SNMP

System architecture

How the immersion loop works

Immersion TANK · Servers sit fully submerged in dielectric mineral oil; heat transfers directly into the liquid.
Dual-redundant pumps · 1+1 hot-standby circulation with automatic duty rotation and sub-2-second failover.
Liquid-to-air heat exchanger · Copper-tube aluminum-fin coil with two VFD fans modulated to inlet temperature.
Siemens PLC control · S7-200 SMART with Modbus TCP telemetry into SCADA, BMS or telecom site controllers.
Level and leak sensing · Low/high oil-level alarms, over-temperature and low-flow detection with event logging.
Power-failure memory · The system restarts automatically with its settings after power restoration.