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CHAPTER 8
Filters
5. Calculating Dust Concentration Levels
An air conditioning system using Lossnay units is shown below. Dust concentration levels can be easily determined using this
diagram.
Dust Concentration Study Diagram
Lossnay unit
Q
: Outdoor air intake amount (CFM (m
o
Q
: Indoor unit of air conditioner air volume
i
(Total air volume of indoor unit) (CFM (m
When the performance of each machine is known, the indoor dust concentration C
η
and η
having been set to specific values as per manufacturer's data. The following formula is used:
o
i
(1 – η
G + C
Q
o
o
o
C
=
i
η
Q
+ Q
o
i
i
Also, with the value of Ci and η
(1 – η
G + C
Q
) – C
o
o
o
η
=
i
C
Q
i
i
U-80
High-efficiency filter ηo
3
η
/h))
: Filtering efficiency of humidifier with high efficiency filter %
o
(colorimetric method)
3
/h))
η
: Efficiency of the filter for the indoor unit of air conditioner %
i
(colorimetric method)
)
known, indoor unit of air conditioner efficiency can be found using:
o
Q
i
o
× 100
Indoor unit of air conditioner
Indoor unit filter ηi
C
: Outdoor air dust concentration (Ib/ft
o
C
: Indoor dust concentration (Ib/ft
i
G : Amount of dust generated indoors (Ib/h (mg/h))
may be obtained with the filter performance,
i
3
3
(mg/m
))
3
(mg/m
3
))
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