Mitsubishi Electric Lossnay LGH-15RX3 Technical Manual page 113

CHAPTER 8 G 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.
G
Outline of air conditioning
Air conditioning area No. of persons in room
2
100 m (Office)
G
Equipment used
Model
Lossnay +
humidifer with
LGH-50RS + PZ-50K
high 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).
110
/h per person × 20 persons = 500 m
3
20 persons 25 m
Heat recovery during
cooling
3,710 W
(3,190 kcal/h)
Cooling
capacity
F
3
5,338 W
(4,590 kcal/h)
≈ 0.12 mg/m ( ≈ 0.123 mg/m
3
}
× 100 = 47% ( = 42% * )
Outdoor air intake volume
Heat recovery during
heating
3,907 W
(3,360 kcal/h)
Heating Air
capacity volume
8,664 W
3
17 m
(7,450 kcal/h)
3
Q = 500 m /h
o
= 17 × 2 × 60 = 2,040 m
Q
i
η
= 65% (η ' = 91% Particle diameter 2.1 µ * )
o o
η
= 65% (η ' = 57% Particle diameter 0.72 µ * )
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
* )
3
set by the Building Standard Law of Japan. If the filtering
Cooling capacity
15,700 W
3
/h
(13,500 kcal/h)
Intake
Filtering efficiency
volume
3
500 m /h
(colorimetric method)
Filtering efficiency
65%
/min
(colorimetric method)
3
/h
3
Heating capacity
13,374 W
(11,500 kcal/h)
65%
, the following is