The components of a Twin Wheel system
Rotary heat exchanger
Rotary heat exhangers are used for
heating
and cooling recovery in air
handling systems
and typically enhances their
efficiency.
The rotary heat exchangers main
component
is the rotor.
Sensible rotor
When spinning, the rotor transfers
heat or cold between supply
and exhaust airstreams. In this
case, where the exchange is
restricted to temperature transfer,
it is called a ‘sensible’ rotor.
Hygroscopic rotor
Through surface treatment the rotor
can also be given moist transferring
abilities. It is then called a
‘hygroscopic’ rotor.
This type of rotor can also recover
energy from water vapor,
which means that it can recover
both sensible
and latent energy. The transfer
principle is
the same for both moist and
temperature.
Cooling coil
The purpose of the cooling coil is
to cool
and/or dehumidify air. Cooling is
achieved
when warm air passes through the
cooling
coil, which consists of parallel
pipes.
When there is also a demand for
dehumidification,
the temperature of the
battery is lowered until the
passing air
reaches its dew point. The
condensated moist is then
extracted by a drip separator. The
outcome of this process
is air with lower temperature and
lower humidity.
Benefits
of Double Wheel Concept
•
Up to 60% lower cooling capacity
•
No additional reheating capacity
•
Sensible wheel precools exhaust air,
sorption
rotor works even more efficient
•
Good control of the supply air
temperature
•
Most energy effective solution for
cooling
and dehumidifying supply air
in
AHU
•
Up to 90% temperature efficiency
in heating case
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