Views: 0 Author: Site Editor Publish Time: 2026-10-10 Origin: Site
An edge data center is often not a room at all — a few racks in a closet, a shelter, a factory corner, a container or a cabinet — so there is no raised floor, no cold aisle and no room-level airflow to rely on. Cooling must happen at the rack: a rear door cooling coil that takes the heat out of the server exhaust before it reaches the space, an in-row precision unit beside the rack, or a closed rack with its own cooling. The edge adds its own constraints — unattended operation, dust and heat, limited power, sometimes dense AI inference hardware — and a growing need to deploy the same solution across many sites. CSTHEATEXCHANGER manufactures Rear Door Cooling Coils for 19-inch racks (active with fans or passive, leak-tested, on a chilled or facility water loop), precision air conditioners for in-row or room duty (24×365, 15–27 °C supply control, free cooling, joint control, open protocol), and the dry coolers and coolant distribution units that reject the heat outside — the complete rack-level cooling chain for the edge.
Option | How it works | Best for | CSTHEATEXCHANGER product |
|---|---|---|---|
Rear door cooling coil (passive) | Coil in the rack's rear door; server fans push exhaust through it; water carries heat away; air returns to the room near ambient | Dense racks where the room cannot absorb the heat; silent; no extra power | Rear Door Cooling Coils (passive) |
Rear door cooling coil (active) | Same with door-mounted fans to overcome coil resistance and raise capacity | Highest rack densities; variable server airflow | Rear Door Cooling Coils (active) |
In-row precision unit | Precision AC beside the rack pulling hot exhaust and discharging to the rack intake side | A few racks, moderate density, no water to racks | Precision Air Conditioner (compact) |
Closed rack / cabinet cooling | Sealed rack with internal air-to-water coil and fans | Single rack in an office or factory | Rack cooling coil + fan (custom) |
Room-level precision AC | Small precision unit cooling the closet | Low density, few racks | Precision Air Conditioner |
Liquid-cooled edge pod | Direct-to-chip or immersion in a container | Dense edge AI | CDU, plate HX, dry cooler; container data center |
Edge condition | Response |
|---|---|
No data hall | Cool at the rack — rear door or in-row — so the surrounding space needs only comfort or ventilation |
Unattended | Passive rear door has no moving parts; active doors and precision units alarm via open protocol; N+1 where two units fit |
Limited power | Passive rear door uses server fans only; precision units use free cooling when outdoor air allows |
Dust, heat, humidity | Sealed water loop to rack; coated dry-cooler fins outside; filtered precision units |
Dense AI inference racks | Active rear door or liquid cooling; rear door also handles residual air heat on direct-to-chip racks |
Many sites | Standard rear-door and precision-unit configurations; one spares holding |
Water at the rack | Leak-tested coils; leak detection; isolation valves; glycol loop to outdoor dry cooler avoids chilled water plant |
Heat rejection | Small dry cooler or air-cooled condenser outside; glycol for cold sites |
Component | Specification |
|---|---|
Rear Door Cooling Coils | 19-inch rack doors, active or passive, leak-tested; water or glycol loop |
Loop | Small pump module with plate heat exchanger (CDU) or direct glycol loop |
Heat rejection | CSTHEATEXCHANGER dry cooler sized for site peak ambient; coated fins for harsh sites |
Backup / room control | Compact precision air conditioner for residual load and humidity; free cooling |
Controls | Leak detection; alarms via open protocol; temperature control on loop |
Fleet | Identical packages across sites |
A passive rear door cooling coil on each rack with a glycol loop to a small outdoor dry cooler — no fans beyond the servers', no room airflow design.
At higher rack densities or variable server airflow where the passive coil's resistance limits capacity.
Yes — active rear doors for dense air-cooled racks; direct-to-chip or immersion with CSTHEATEXCHANGER CDUs and dry coolers for the densest.
Our rear door coils are leak-tested; the package includes leak detection and isolation; the loop can be glycol to an outdoor dry cooler.
Yes — rear door coils, CDU/plate heat exchanger, dry cooler, precision unit and controls.
Send CSTHEATEXCHANGER the rack count and power per rack, site enclosure and climate, water or glycol preference, and number of sites. We will return a rear-door or in-row package with heat rejection for approval.
Email: info@cstheatexchanger.com
International business: +86 0519 8878 2189
Website: https://www.cstheatexchanger.com/
CSTHEATEXCHANGER — rack cooling for the edge, where the rack is the data center.
