Rotary Energy Recovery Heat ExchangerProduct DescriptionRotary heat
exchanger (wheel) is mainly used in building ventilation or in the
air supply/discharge system of air conditioning equipment. The
wheel transfers the energy (cold or heat) contained in exhaust air
to the fresh air supplied to indoor. It's one important equipment
and key technology in the field of construction
energy-saving. Rotary heat exchanger is composed of heat
wheel, case, drive system and sealing parts. The heat wheel rotates
powered by the drive system. When outdoor air passes through half
of the wheel, return air passes through reversely the rest half of
the wheel. In this process, about 70% to 90% heat contained in the
return air can be recovered to supply air to indoor. Working
PrincipleRotary 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
outdoorair. The energy recovery efficiency is up to 70% to
90%.Wheel MaterialsThe sensible heat wheel is made by aluminum
foils of 0.05mm thickness.And the total heat wheel is made by
aluminum foils coated with 3A molecular sieve of 0.04mm thickness.
Case Construciton:Wheel ConstructionThe 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 ChannelsThe 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
SystemUnique double-sealing system is installed around the rotor
periphery and along the central beam. The sealingmaterials are soft
and dense of small friction and longer service life.Purge
SectorBecause of the structure of rotary heat exchanger, the
outdoor air and exhaust air will mix. According to the airvelocity,
wheel rotating speed and direction, purge sector is installed to
prevent the exhaust air from entering theoutdoor air. The purge
sector enables a small fraction of outdoor air to blow back
the exhaust air in the alveolateholes 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. Positioning of Fan and
WheelThe cleaning effect of the purge sector is bound up with the
fan position and static pressure difference between outdoor air
side and exhaust air side. When the pressure difference is less
than 200pa, the cleaning effect is not guaranteed.Selection
ProgramWe have developed a calculation program for simple selection
of a rotary heat exchanger model. It can not only beused as a
single design selection program, but can also be combined into your
program by DLL. We can add it toyour program upon your request,
too. Please contact us for the selection program.
Application:Rotary heat exchanger can built in air handling
unit(AHU) as a main part of the heat recovery section. Usuallyside
panel of the exchanger casing is unnecessary, except that bypass
has been set in AHU. It can also be installed in the ducts of
ventilation system as a main part of the heat recovery section,
connected byflange. In this case, side panel of the exchanger is
necessary to prevent leakage. /* January 22, 2024 19:08:37
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