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CHAPTER 8
Filtering for Freshness
[Calculation example]
The indoor dust concentration for the following types of design conditions with the above system shall be used in the following
example.
Outline of air conditioning
Air conditioning area
No. of persons in room
2
100 m
(Office)
Equipment used
Model
Lossnay +
with high
LGH-50RX type + PZ-50RFM
efficiency
(with high efficiency filter)
filter
1 unit
Model
Fan coil unit
LH-600CR-B
(with high efficiency filter)
2 units
Calculation
Intake volume
Indoor unit air volume
Filtering efficiency of humidifier with high efficiency filter
Filtering efficiency of filter for inside unit
Outdoor air floating dust concentration
Amount of dust generated in room
If the inside dust concentration Ci is found with the above, the following data is obtained:
200 + 0.1 × 500 (1 – 0.65)
C
=
i
500 + 2,040 × 0.65
The result is less than the dust concentration limit of 0.15 mg/m
efficiency of a filter for the indoor unit is obtained to set the inside dust concentration Ci to 0.15 mg/m
obtained:
{
200 + 0.1 × 500 (1 – 0.65) – 0.15 × 500
η
=
i
0.15 × 2,040
This shows that the filtering efficiency of the indoor unit filter must be a minimum of 47% (colorimetric method).
* The result of a calculation using an average outdoor airborne particle diameter of 2.1 µm and an average indoor airborne
particle diameter of 0.72 µm is shown.
92
3
20 persons
25 m
/h per person × 20 persons = 500 m
Heat recovery during
cooling
3,710 W
Cooling
capacity
F
3
5,338 W
3
0.12 mg/m
(
}
Outdoor air intake volume
Heat recovery during
heating
3,907 W
Heating
capacity
volume
8,664 W
17 m
3
Q
= 500 m
/h
o
Q
= 17 × 2 × 60 = 2,040 m
i
η
= 65% (η
' = 91% Particle diameter 2.1 µm * )
o
o
= 65% (η
' = 57% Particle diameter 0.72 µm * )
η
i
i
3
C
= 0.1 mg/m
o
G = amount of dust generated per person × no. of persons in room
= 10 mg/h·person × 20 persons = 200 mg/h
3
0.123 mg/m
* )
3
set by the Building Standard Law of Japan. If the filtering
× 100
47% (
42% * )
Cooling capacity
3
/h
15,700 W
Intake
Filtering efficiency
volume
3
500 m
/h
(colorimetric method)
Air
Filtering efficiency
65%
3
/min
(colorimetric method)
3
/h
Heating capacity
13,374 W
65%
3
, the following is
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