Comparing Energy Recovery Techniques - Mitsubishi Electric Lossnay series Technical Manual

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CHAPTER 3 General Technical Considerations

8. Comparing Energy Recovery Techniques

Basic Methods of Total Energy Exchangers
Energy recovery
principle
8.1 Principle Construction of Rotary-type Energy Recovery Techniques
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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.
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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.
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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.)
U-34
Type
Static
(Mitsubishi Lossnay) transmission type
Rotary type Heat accumulation/
humidity accumulation
type
Method Air flow
Conductive Cross-flow
Counterflow
Approx. ø1.5mm
Purge sector
Supply air
Bearing
Return air
Rotor rotation direction
Return air
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
Country of
development
Japan
Sweden
Exhaust
Drive motor
Rotor
Fresh air
Exhaust
Room side
Drive motor
Fresh air
A
Vr
Vs
B
Fresh air
Purge sector