Mitsubishi Electric Lossnay series Technical Manual page 103

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CHAPTER 11 Lossnay Q and A
Question
Can Lossnay units be used
8
for hospital air conditioning?
Because entry into the
Lossnay Core is small,
9
won't it clog easily?
What is the air leakage
10
rate?
Can Lossnay units be
used in extreme cold
11
climates (14°F(-10°C) or
lower)?
U-94
According to the results from a test performed by the Tokyo University
Hospital (Inspection Center, Prof. Kihachiro Shimizu), as the supply air and
exhaust air pass through different passages, bacteria transmission from
exhaust side to supply side is low. They found:
1) Bacteria do not propagate in the Lossnay Core.
2) Even if bacteria accumulated in the Lossnay unit, it died off in
approximately two weeks.
Normally the original state of the filter can be regained by cleaning it with a
vacuum more than once every year, and the two intake side surfaces of the
Lossnay Core more than once every two years. Dust will not accumulate in
the passage due to the laminar flow if the air is normal.
Turbulent flow
This will be different depending on the position of the fans, but for "both
suction" or "both forced" , the rate is 2% to 3%. LGH type fan position is "both
forced" .
Outdoor Indoor
Exhaust fan Supply fan
EA
Lossnay
OA RA
For using LU type, if the difference in static pressure between SA and RA,
and EA and OA is 2.0 inH O, the air leakage rate will be 2.5% and 3.4%
2
respectively. This value is not a problem for actual use.
However, the single suction or single forced methods will have a leakage rate
of 10% or higher and should be avoided.
If the winter room air temperature is above 68°F (20°C), humidity is above
50%, and the outdoor temperature is 14°F (-10°C) or lower, moisture
condensation or frost will develop on the Lossnay Core. In this case, the
intake air must be preheated.
Plot the Lossnay intake side air conditions A and B on a psychrometric chart as
shown below. If the high temperature side air B intersects the saturation curve
such as at C, moisture condensation or frost will accumulate on the Lossnay
unit. In this case, the air should be warmed up to the temperature indicated by
Point A' so that Point C reaches the C' point.
Saturation curve
C
A
Dry bulb temperature (°F (°C))
Answer
Laminar floe
Outdoor Indoor
SA
EA
SA
Lossnay
OA RA
Exhaust fan Supply fan
B
C'
A'
Remarks
"Normal air" refers to
air that does not
contain oil mist, etc.
When exhausting air
contains oil mist, etc.,
install a filter at return
grille.