What Are Rear Door Heat Exchangers?

As server power density keeps increasing, traditional CRAC unit air cooling often struggles to remove high heat loads inside server racks. Rear door heat exchangers have become a popular supplemental cooling hardware for both new and existing data center facilities.

Rear door heat exchanger, also known as rack rear door cooler, replaces the original rear metal door of an IT server rack. It is fitted with tube‑fin heat exchanger coils. Chilled water runs through the coil. Hot exhaust air coming out from server components passes directly through this rear door heat exchanger, and most of the heat is absorbed by the cooling water before air spreads into the data center room.

This design reduces the cooling burden placed on room‑level CRAC units. It works well together with In‑Row CDU and Cabinet In‑Row CDU liquid cooling systems. Rear door heat exchangers help control rack inlet temperature, avoid local hot spots, and support higher power‑density server deployments.

Rear door heat exchangers are widely used for data center retrofit projects. There is no need for large‑scale modification to the whole computer room. Operators can install rear door heat exchangers on selected high‑heat racks first, instead of upgrading every rack at one time.

At cstheatexchanger.com, we supply heat exchange coil cores for rear door heat exchangers. These coil assemblies can be used for new rear door cooler manufacturing or spare part replacement. We offer standard units and custom‑made coils according to your rack dimension and cooling capacity requirements.

System integrators working on data center cooling upgrade, CRAC unit optimization or liquid‑cooling retrofits can reach out to us for technical data sheets and price offers.