Rear-Door Cooling and Rack Integration

Mirror Daily reported on October 27, 2026 that Taiwanese server-chassis and thermal company Ablecom (大訊科技) has introduced its AbleCool series of modular cooling products. The series uses rear door heat exchanger (RDHx) modules to bring liquid cooling to AI data centers. Ablecom’s product release, published August 25, says the modules mount on the rear of standard server racks. The models include waterless airflow boosters, telecom-grade DC units, mid-to-high-density hybrid liquid cooling, and 100kW-class doors for AI racks.

What rear-door heat exchangers are meant to solve

An RDHx replaces a rack’s rear door with a liquid-cooled heat exchanger, so server exhaust air is cooled before it leaves the rack. Ablecom says that, compared with building hot/cold aisle containment or deploying precision air conditioning, such modules mount directly on the standard rack door, saving space and capital expenditure and suiting upgrades of existing facilities. These are manufacturer claims.

How to read the PUE 1.06 figure

Ablecom says the modules can help operators move facility PUE toward 1.06, and Mirror Daily writes that PUE “can reach” that level. Neither the report nor the release identifies a measured site, load, or measurement conditions. The figure should be read as a manufacturer-stated target, not an independently verified result that every deployment can reproduce. PUE is also the ratio of total facility energy to IT equipment energy (ISO/IEC 30134-2). It covers all non-IT loads, including cooling and power delivery, so it does not measure a single cooling device’s efficiency.

Beyond the cooling module: the mechanical interfaces

What follows is editorial interpretation: general engineering considerations, not design details published by Ablecom. A rear-door module is added to the rack, but it changes the physical space behind it. In the release, one model is 235 mm deep, and different models are described for 48U–52U or 48U–60U racks. Door depth adds to rack depth and affects aisle width. The door’s opening method, the position of pipes and quick connectors, and cable management all affect rear service access, and exhaust paths should not be blocked by cables or internal layout.

In short, the cooling technology determines how heat is carried away, while the mechanical hardware determines whether equipment can be installed, withdrawn, and serviced.

AEON AI Technology’s perspective

At AEON AI Technology, we see a rear-door cooling module as a new physical interface on the rack, and we believe the dimensional relationship between chassis, slide rails, and rack should be reviewed together with it. Our website lists 1U, 2U, and 4U rackmount chassis, ATX embedded chassis, and slide rails, which are mechanical-layer products. We believe chassis depth, rear cable exit and service space, and the relationship between slide-rail travel and rack depth should be aligned with a customer’s rack and cooling specifications early in design, rather than discovered as interference at final assembly. This is our view of mechanical design.

Conclusion

AbleCool is one approach to introducing liquid cooling without replacing existing racks. For hardware manufacturers and system integrators, the practical takeaway is straightforward: when evaluating a cooling module, list door depth, rear clearance, service access, and chassis and rail dimensions together, and align them with customers early. Whether PUE 1.06 can be reproduced in real deployments awaits more published measurement data.

Contact AEON AI Technology for more information about the company and its services.