General Technical Considerations
8. Comparing Energy Recovery Techniques
Basic Methods of Total Energy Exchangers
8.1 Principle Construction of Rotary-type Energy Recovery Techniques
Rotary-type energy recovery units have a rotor that has a layered
honeycomb structure made of kraft paper, plastic, aluminum or
other substrate materials, drive motor and housing.
A moisture absorbent material (desiccants such as litium
chloride, silicagels or engineered molecular sieve material) is
a p p l i e d o n t o t h e r o t o r, a n d h u m i d i t y i s t r a n s fe r r e d .
The rotor rotates a few to 30 times a minute by the drive motor.
Rotary-type energy recovery units, when cooling, the high
temperature and high humidity ventilation air passes through the
rotor, with the heat and humidity being absorbed by the rotor.
When the rotor rotates, it moves into the exhaust air passage,
and the heat and humidity is discharged to the outdoors because
the exhaust is cool and has low humidity.
The rotor rotates and returns to the ventilation air passage to
absorb the heat and humidity again.
Function of the purge sector
There are two separation plates (purge sectors) in the front and
back of the rotor to separate airflow. Because one of the plates
is slightly shifted, part of the ventilation air always flows into the
exhaust air passage to prevent the exhaust air and ventilation air
from mixing. (A balanced pressure difference is required.)
Rotor rotation direction
When a purge sector is added, the exhaust air in the rotor going
into the air on the supply side can be prevented.
Vr: Rotor speed, Vs: Air speed in relief section