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Combi HU/HC-EX6

Combi counter-flow
heat exchangers

Dual-core counter-flow heat exchangers by ZERN ENGINEERING (Combi HU/HC series) are designed to handle high airflow while maintaining high thermal efficiency and low pressure drop. By splitting air across two identical heat exchangers inside one housing, Combi units deliver large-capacity energy recovery without sacrificing performance - ideal for demanding commercial and industrial AHUs.

Key operational parameters

Performance сharacteristics

Thermal efficiency

Up to 90% under optimal conditions.

Pressure drop

Typically, 60–200 Pa (depends on airflow and core size).

Operating temperature

−25 °C to +50 °C

Technical features

Design and structure

3D model

Principle of operations
In the Combi design, the air streams are divided evenly between two parallel counter-flow heat exchangers. Each heat exchanger independently facilitates heat transfer between supply and exhaust air streams moving in opposite directions. The integration of a common plenum ensures balanced airflow distribution, maintaining high thermal recovery while keeping airflows separated to prevent cross-contamination.
Plenums

Two identical counter-flow exchangers assembled in a monolithic module with shared plenums.


  • Combi HU-EX6: polystyrene plenums (lightweight, insulated)
  • Combi HC-EX6: aluminum plenums (higher mechanical strength)
Casing materials
  • Aluzinc steel - economical and corrosion-resistant for long-lasting performance.
  • Aluminum - lightweight, corrosion-resistant; good for humid sites.
  • Epoxy-coated - for chemically active or coastal areas.
  • Stainless steel (AISI 304/316) - for aggressive/hygienic sites

Model сonfigurations
  • Combi HU/HC-EX6 815 - 2 × HC-EX6 394 cores
  • Combi HU/HC-EX6 959 - 2 × HU-EX6 477 cores
  • Combi HU/HC-EX6 1089 - 2 × HC-EX6 533 cores

Main areas of use

Applications


  • Large commercial buildings - shopping centers, business complexes, offices, schools.
  • Industrial facilities - production halls, warehouses, logistics centers.
  • Hotel and wellness sector - hotels, sports and fitness centers, swimming pools.
  • Public venues - airports, exhibition halls, arenas, transport hubs.
  • Centralized HVAC systems - modular or custom AHUs requiring high-capacity energy recovery.

SIZES OF OUR HEAT EXCHANGERS

MODEL LINE


  • Dimensions A and B are fixed. Dimension C is the width of the heat exchanger and can be varied.
  • Each heat exchanger model can be manufactured with a depth (dimension C) ranging from 100 mm to 600 mm per unit.
  • Heat exchangers with a width of 600 mm and above are supplied as two or more units.
Series
commercial group		 Model A
width [mm]		 В
height [mm]		 C
depth [mm]		 X
casing modification
Combi HU / HC-EX6 815 1040 815 100-600 3 / 4
959 1182 959 3 / 4
1089 1314 1089 3 / 4

Decoding Product Specifications

Designation key

Combi HU / HС - EX6
-
B
/
C
-
x

Combi HU / HС - EX6

commercial group

B

height (mm)

C

depth (mm)

x

casing modification

  • 3 - aluminium
  • 4 - aluminium epoxy coated