Cross-Flow Air-to-Air Heat Exchangers in Data Center Indirect Evaporative Cooling
Data centers now account for a fast-growing share of global electricity demand, and cooling is the single largest non-IT load. Indirect evaporative cooling (IEC) has become a preferred strategy to trim PUE without soaking the servers in humid outdoor air. At the heart of an IEC loop sits a cross-flow air-to-air heat exchanger that transfers heat between the warm exhaust plume and the incoming supply air - without letting the two streams ever mix.
Why cross-flow geometry fits the data hall
In a cross-flow plate exchanger the exhaust and supply air travel at right angles across a stacked aluminium or polymer plate pack. The perpendicular path keeps pressure drops low, lets the core be built as compact modular blocks, and makes it simple to scale capacity by adding plates. Sensible effectiveness typically lands between 60% and 75%, enough to pre-cool outdoor air by a wide margin before it reaches the direct evaporative stage.
Energy and reliability benefits
- Lower PUE: pre-cooling the supply air shrinks both the mechanical cooling load and the water used by the evaporative section.
- No contamination risk: the plate wall keeps dust, moisture and potential carryover away from the IT supply stream.
- Easier maintenance: the straight plate channels can be inspected and washed without dismantling the unit.
Where it is deployed
Cross-flow cores are used in rooftop air handlers, perimeter cooling modules and integrated IEC units for edge and hyperscale facilities alike. Because the geometry is modular, operators can match the heat-exchange area to the server load profile and add redundancy per aisle.
If you are specifying a cooling retrofit or a new build, our engineering team can size a cross-flow core to your design wet-bulb, airflow and redundancy targets. Contact us for a tailored heat-recovery proposal.