Two geometries, one isolation principle
Plate heat-recovery cores come in two main airflow geometries, and the choice affects effectiveness, size, and how the unit fits the equipment. Both keep the supply and exhaust streams separated by solid plates, so neither mixes air; the difference is the direction the two streams travel.
Crossflow
In a crossflow core the two airstreams enter at right angles. This arrangement fits naturally into rectangular ducts and cabinet edges, making it popular for air handlers, fresh-air units, and electrical cabinet cooling where space is constrained. Crossflow is simpler to manufacture and seal, and it handles moderate effectiveness needs well.
Counterflow
In a counterflow core the streams move in opposite directions along the plates. Because the cold inlet meets the coldest exhaust exit and the warm inlet meets the warmest exhaust, counterflow can reach a higher effectiveness for the same core volume. The trade-off is more complex manifolding and a typically deeper core, which needs more installation depth.
How to choose
Selection should follow the duty. Tight enclosures and standard ventilation favor crossflow; high-recovery targets in space-rich plants favor counterflow. In both cases the protected air must stay isolated, so plate cores are preferred over rotating wheels wherever contamination or moisture carryover is unacceptable, such as laboratories, food plants, and livestock houses.
Check the curves
Pressure drop and cleanability also differ by geometry and plate pattern. Ask the supplier for effectiveness and pressure-drop curves at your real flow rates, not just a single catalog point, and confirm the core can be accessed for washing. Matching geometry to the actual duty avoids both undersized and oversized extremes that waste money or underperform.
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Key takeaway
In practice many projects blend both geometries: a crossflow core for the tight cabinet and a counterflow core for the central recovery plant. Decide per location, and let the measured effectiveness and pressure-drop curves, not the catalog photo, settle the choice.