Views: 0 Author: Site Editor Publish Time: 2026-09-29 Origin: Site
The rear door heat exchanger coil developed for server racks transfers directly to air-cooled battery racks in a BESS container. Mounted on the rear of the battery cabinet, the air-to-liquid coil captures the warm exhaust from the battery modules and rejects it to a glycol loop and an outdoor dry cooler, so each rack is cooled individually and the container's shared air system can be smaller — or removed. CSTHEATEXCHANGER manufactures rear door cooling coils for standard 19-inch racks in passive and active versions and adapts them to battery cabinet dimensions, with corrosion-protected fins for outdoor containers and the matching dry cooler on the same loop.
Battery life depends on temperature uniformity. In a container with a shared air system, racks near the air supply run cooler than racks at the far end, and cells inside each rack see a gradient from inlet to outlet. A rear door coil on every rack gives each rack its own heat exchanger on a common water loop:
Shared air system | Rear door coil per rack |
|---|---|
Rack-to-rack temperature spread | Each rack cooled to the same water temperature |
Large ducts and fans in the container | Slim doors; container air system reduced |
Hot exhaust mixes into container air | Exhaust cooled at the rack |
One large fan failure affects all racks | Door-level redundancy (active) or no fans (passive) |
This is the air-cooled BESS integrator's step toward liquid-cooling uniformity without changing the battery modules themselves.
Feature | BESS specification |
|---|---|
Mounting | Rear-door mounted, ultra-slim; standard 19-inch frame or custom battery-cabinet dimensions |
Versions | Passive where the battery rack's own fans provide airflow; active with integrated EC fans where rack fans are small or absent |
Water side | Glycol loop to an outdoor dry cooler (CSTHEATEXCHANGER supply) or to a chiller |
Coil | Copper tube / aluminium fin; pre-coated anti-corrosion aluminium fins or copper fins for outdoor containers; hydrophilic coating where condensation is possible |
Heating option | Loop can carry warm glycol in winter so the same coil pre-warms cells before charging |
Quality | Leak-tested; service-friendly |
Customisation | Capacity, cabinet height, connection type, fan configuration, control interface; private labelling for integrators |
For an outdoor BESS container the rear door coils are normally fed by a roof- or side-mounted dry cooler. CSTHEATEXCHANGER dry coolers use hot-dip galvanized steel casings with zinc-aluminium coating, staggered seamless copper tubes with corrugated aluminium fins, thick seamless copper headers with threaded steel connections, direct-drive maintenance-free axial fans, and are pressure tested at 15 bar. Where the site's summer ambient is too high for a dry cooler to hold the battery setpoint, we supply hybrid or adiabatic coolers instead. Because we build the coils and the dry cooler, the loop is designed end to end.
Heat load per battery rack at peak charge/discharge.
Battery module exhaust airflow and temperature, and the rack fan static pressure (decides passive vs active).
Required module inlet-air temperature and allowable spread — the uniformity target.
Site ambient range — maximum sets the dry cooler approach; minimum sets glycol concentration and whether heating is needed.
Cabinet dimensions and rear-door frame details.
Noise and footprint limits for the dry cooler.
We return a door coil drawing matched to the cabinet and a dry cooler drawing matched to the container, for approval before manufacture.
