Mitsubishi Electric Lossnay LGH-15RX3 Technical Manual page 40

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9.2 Comparison of static-type and rotary-type heat recovery units
Item
<Conductive transmission-type: cross-flow>
Static-type transmission total heat recovery unit
with orthogonally layered honeycomb shaped
treated paper formed into multiple layers.
G
As the supply air and exhaust air pass through
Construction/
different passages (sequentially layered), the air
principle
passages are completely separated.
G
None
Moving parts
Fixed core
Material quality
Treated paper
Mounting of prefilter
Required (periodic cleaning required)
G
Occurs (state where dirt adheres onto element air
passage surface. However, this is easily removed
Element clogging
with a vacuum cleaner.)
Approximately 2.5% air leak at standard fan
position.
Leaks on the air supply side can be reduced to 0 by
Air leakage
leaking the loss air volume (approx. 10%) on the
Gas transmission
exhaust side with the fan position to the core.
rate
G
Gas transmission ( Ammonia
G
Bacteria
Low (As air intake/exhaust are separate,
transmission rate
transmission is low.)
Bypass circuit required (OK on one side of air
Operation during
intake and exhaust air outlet passage)
off-seasons
Maintenance
Core: Semi-permanent (10 years or more)
(The static-type does not break.)
Life
o
Available from small to large.
o
Characteristic design of small
Model system and
and medium models possible.
comparison
Large models are easy to
match to machine room layout.
Standard treatment
40 to 25,000 m
air volume
Enthalpy recovery
efficiency
Pressure loss
Installation space
Effective for small to medium capacity
(W × D × H)
(Layout is free according to combination.)
Measure of useability
Static-type
hydrogen sulfide : approx. 6.7%)
Core cleaning: More than once a year
The core surface will clog with lint and dirt, but
cleaning is easy with a vacuum cleaner.
Only the two core air passage intakes need to be
cleaned.
3
/h
G
High
o
Average
CHAPTER 3 G General Technical Considerations
<Heat accumulation/humidity accumulation-
type: counterflow>
The rotor core is composed of honeycomb-shaped
kraft paper, etc., to which a moisture absorbent is
applied (lithium chloride, etc.). This rotor is rotated,
and heat accumulation/humidity accumulation -
heat discharge/humidity discharge of total heat
exchange is performed by passing the exhaust and
intake airs into a honeycomb passage.
× Supply air and exhaust airs flow into the same air
passage because of the rotary-type construction.
× Used (rotor driven with belt by gear motor)
Rotor core (8RPM)
Treated paper, aluminum plates, etc.
Required (periodic cleaning required)
× Occurs (Dust is smeared into element air passage filter.)
(The dust adhered onto the core surface is smeared
into the air passage by the purge sector packing.
Thus, it cannot be removed easily and the air
volume decreases.)
× Purged air volume occurs
To prevent leakage of exhaust to the air intake side, a
purge air volume (6 to 14%) leak is created to the
exhaust side. Thus, there are problems in the purge
sector operation conditions (pressure difference,
speed), and the air volume balance must be balanced.
: 28%,
× Gas transmission (Ammonia
× High (As air intake/exhaust are the same,
transmission is high.)
Bypass circuit required (Required on both air intake
and exhaust air outlet sides)
(In theory, operation is possible by stopping the rotation,
but the core will over-absorb, causing drainage.)
Core cleaning: Once every one to two years
Cleaning is difficult as dust is smeared into core
with the packing.
× Gear motor for rotor drive
× Rotor bearing, rotor drive belt : Periodic inspection
Core: Semi-permanent (10 years or more)
(Periodic replacement is required according to the
rotor bearings and core clogging.)
× Rotor drive belt
× Drive motor, rotor bearing : Periodic replacement
Large type only
Example
× Small models are difficult to
LU-1605
design because of the rotor
magnitude.
o
100 to 63,000 m
3
8,000 m
/h
Temperature:77%
Enthalpy
Heating : 71%
Cooling : 66%
17 mmAg
600 × 2100 × 2540
Large capacity models are
effective
× Poor
Rotary-type
: 45-57%,
hydrogen sulfide : approx. 3.2-4%)
: Periodic inspection
: Periodic replacement
Example
EV-1500
3
3
/h
8,000 m
/h
74%
18 mmAg
320 × 1700 × 1700
37

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