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Combi Hp-EX4, Combi E-EX4

Combi cross-flow heat exchangers

Combi cross-flow heat exchangers by ZERN ENGINEERING (Combi Hp/E-EX4 series) are high-capacity energy recovery units that combine several cross-flow cores into one housing, enabling much larger airflows while maintaining low resistance and preventing any mixing of the airstreams. Available in sensible (polystyrene) and enthalpy (aluminum + membrane) versions, Combi exchangers adapt to diverse projects - from thermal-only recovery to combined heat and moisture transfer.

Key operational parameters

Performance сharacteristics

Thermal efficiency

Up to 75% under optimal conditions

Humidity efficiency

Typically, 40–150 Pa (depends on air flow, plate spacing & core size)

Pressure drop

Typically, 40–150 Pa (depends on air flow, plate spacing & core size)

Operating temperature

-25°C to +50°C

Technical features

Design and structure

3D model
Principle of operations

Supply and exhaust streams pass perpendicularly through channels formed by stacked plates or membrane-aluminum layers, transferring heat (and in enthalpy models, moisture) without mixing streams of air. What distinguishes the Combi design from a standard single-block model is the integration of several identical cross-flow cores operating in parallel within one casing. This modular format increases airflow capacity, maintains uniform performance, and keeps pressure drop low.

Core material
  • Hp-EX4 (sensible): thermoformed polystyrene for heat-only recovery.
  • E-EX4 (enthalpy): aluminum foil laminated with a vapor-permeable membrane for combined heat and moisture recovery.

Casing materials
  • Aluzinc steel - economical and corrosion-resistant for long-lasting performance.
  • Aluminum - lightweight, corrosion-resistant; good for humid sites.
  • Stainless steel (AISI 304/316) - for aggressive/hygienic sites.

Main areas of use

Application


  • 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 800 mm per unit.
  • Heat exchangers with a width of 800 mm and above are supplied as two or more units.
Series
commercial group		 A
width [mm]		 В
height [mm]		 С
depth [mm]		 h
plate distance [mm]		 X
casing modification
Combi Hp-EX4 400 - 3000 400 - 3000 100 - 3000 2.4 / 2.7 / 3 1 / 3 / 5
Combi E-EX4 400 - 3000 400 - 3000 100 - 3000 2.7 / 4.5 1 / 3 / 5

Decoding Product Specifications

Designation key

Combi Hp/E-EX4
A
/
C
/
h
-
x

Combi Hp/E-EX4

commercial group

A

width, length (mm)

C

depth (mm)

h

distance between plates (mm)

x

casing modification

  • 1 - aluzinc
  • 3 - aluminium
  • 5 - stainless steel