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Regenerative heat wheels
A regenerative heat wheel is a revolving disc filled with an air-permeable medium including a desiccant. When the air passes through the medium, heat energy and moisture are transferred to the medium. As the medium rotates into the opposing air stream, the warmed, moist medium transfers the heat and moisture to the opposite-flowing air stream. Therefore, a heat wheel can either: reduce entry of warm, moist outside air into the lab building, or recover heat and moisture that would have been simply exhausted for the building. There has been a renewed interest in heat wheels since molecular sieve coatings have been used that ensure minimal contaminant transfer


There are three general types of wheels being used today.
They are sensible, enthalpy and regenerative. Many times
they are referred to as “desiccant” wheels, but this only confuses rather than clarifies since only two of these types have desiccant as part of their designs. The actual definitions are:

SENSIBLE WHEEL - This wheel is not coated with a desiccant
and therefore transfers only sensible energy. The wheel can
be constructed of almost any material (paper, metal or plastic) and transfers energy between two air streams as the mass of the material gains or loses heat to the opposite air
stream. The wheel rotates at a speed of 25 to 50 revolutions per minute.

ENTHALPY WHEEL - It is similar to the sensible wheel except that a desiccant media is added to the wheel’s surface. As the wheel rotates, it now can transfer sensible energy and humidity.
This wheel also rotates at 25 to 50 revolutions per minute.

REGENERATION WHEEL - This wheel is used when low dew-point conditions (<45°F) are required, such as industrial applications. It achieves low dewpoints by slowing the wheel
to a speed of between 0.25 and 1 revolution per minute and
by using an air stream heated to
250°F or more to drive off moisture and regenerate the wheel.
This heated air stream is typically focused on only 1/4 of the wheel’s area thereby allowing 3/4 of
the area to be available for the process side.

Cross leakage through the energy recovery wheels ranges from 2% to 5% between the supply and exhaust air streams .  
Enthalphy Wheel Desiccant media  
Energy recovery wheel manufacturers  
Air to air wheel heat exchanger selection software (from HOVAL)  
Air to air wheel heat exchanger selection software (from RotorSource)  
Heat Recovery Wheel Control Systems  
Heat Recovery Wheel Typical Operation  
Heat Recovery Ventilation (HRV)  










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