Treated Fresh air Units :- Twin wheel concept Type

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
• Most energy effective solution for
cooling and dehumidifying supply air
in AHU
• Up to 90% temperature efficiency

in heating case

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