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CHAPTER 11
Lossnay Q and A
Question
Can the Lossnay be used
8
for hospital air conditioning?
Since the entry to the
Lossnay Core is fine and
9
the incident air turbulent,
won't it clog easily?
What is the air leakage
10
rate?
Can the Lossnay be used in
11 extreme cold climates
(-10°C or lower)?
102
According to the results obtained from the test performed by the Tokyo
University Hospital (Inspection Centre, Prof. Kihachiro Shimizu), as the
supply air and exhaust air pass through different passages, transmission
of bacteria from exhaust side to supply side is low. They found:
1) Bacteria does not propagate in the Lossnay Core.
2) Even if bacteria accumulated in the Lossnay, it died off in
approximately two weeks.
Normally, the original state of the filter can be regained by cleaning it
more than once every one year, and the two intake side surfaces of the
Lossnay Core more than once two years with a vacuum cleaner. Dust will
not adhere in the passage due to the laminar flow if the air is normal.
Turbulent flow
This will differ on the position of the fans, but for both suction or both
forced, the rate is 2% to 3%.
Outdoor
Exhaust fan
EA
Lossnay
OA
If the static pressure difference between SA and RA and between EA and
OA is 500 Pa, the air leakage rate will be 2.5%, and 3.4%. This value is
considered to be of no 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 20°C along with the humidity
above 50%, and the outdoor temperature is -10°C or lower, moisture
condensation or frosting will occur 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 frosting will occur
on the Lossnay. In this case, the air should be preheated to the
temperature indicated by point A' so that point C reaches the C' point.
C
A
Dry bulb temperature (°C)
Answer
Laminar floe
Indoor
Supply fan
Outdoor
Indoor
EA
SA
SA
Lossnay
OA
RA
Exhaust fan
Supply fan
Saturation curve
B
C'
A'
Remarks
Normal air refers to air
that does not contain
oil mist, etc.
When exhausting air
containing oil mist,
etc., install a filter at
return grille to remove
the oil mist.
RA
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