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Working Principle
Rotary heat exchanger is composed of alveolate heat
wheel, case, drive system and sealing parts. The exhaust
and outdoor air pass through half of the wheel
separately, when the wheel rotates, the heat and moisture
are exchanged between the exhaust and outdoor
air. The energy recovery efficiency is up to 70% to
90%.

Wheel Construction
The wheel of the rotary heat exchanger is made of alternating layers of
flat and corrugated aluminum foil to form the alveolate shape.
Various height of corrugation is available.
Flat surface ensures minimum leakage.
Interior spokes are used to mechanically bond the rotor’s laminations.
These are threaded at the hub and welded at the periphery.

Laminar Flow Channels
The wave type structure of the wheel forms narrow channels
in the direction of air flow. The air flow forms a
laminar flow inside the wheel when passing through it.
When the wheel rotates, dust won’t accumulate on the
channel since outdoor air and exhaust air respectively
flow through the channels from two directions. This is
called self-cleaning.

Double Sealing System
Unique double-sealing system is installed around the rotor
periphery and along the central beam. The sealing
materials are soft and dense of small friction and longer
service life.

Purge Sector
Because of the structure of rotary heat exchanger, the
outdoor air and exhaust air will mix. According to the air
velocity, wheel rotating speed and direction, purge sector
is installed to prevent the exhaust air from entering the
outdoor air. The purge sector enables a small fraction of
outdoor air to blow back the exhaust air in the alveolate
holes to its side. A minimum pressure difference of
200Pa between the outdoor air side and the exhaust air
side is required to ensure the cleaning effectiveness. With
all conditions provided, the sector can ensure a leakage
below 0.3% from exhaust air to outdoor air.