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Mitsubishi Electric Lossnay series Technical Manual Page 19

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CHAPTER 1
Ventilation for Healthy Living
5.1 B (SI unit)
The ventilation air load can be calculated with the following formula if the required ventilation intake volume "Q m
(Ventilation air load) = γ · Q
F
3
2
= γ [kg/m
] × S [m
] × k × n [occupant/m
γ : Specific air gravity - 1.2 kg/m
S : Building's air-conditioned area
k : Thermal coefficient; generally 0.7 - 0.8.
n : The average population concentration is the inverse of the occupancy area per occupant. If the number of occupants in the
room is unclear, refer to the Floor space per occupant table below.
Vf : Ventilation air intake volume per occupant
Refer to the Required ventilation air intake volume per occupant table below.
i
: Ventilation air enthalpy - kJ/kg
O
i
: Indoor enthalpy - kJ/kg
R
Floor Space per Occupant (m
(According to the Japan Federation of Architects and Building Engineers Associations)
Office Building
General Design
4 - 7
Value
5
Required Ventilation Air Intake Volume Per Occupant (m
Amount of Cigarette Smoking
Extremely Heavy
Quite Heavy
Heavy
Light
None
Caution
The amount of smoking that could be present in each type of room must be carefully considered when obtaining the
required ventilation volume shown in the table above.
U-10
· (i
- i
)
O
R
2
3
] × Vf [m
/h·occupants] × (i
3
2
)
Department Store, Shop
Average
0.5 - 2
3.0
Application Example
Broker's office
Newspaper editing room
Conference room
Bar
Cabaret
Office
Restaurant
Shop
Department store
Theater
Hospital room
- i
): ∆i [kJ/kg]
O
R
Crowded
Empty
0.5 - 2
5 - 8
1.0
6.0
3
/h·occupant)
Required Ventilation Volume
Recommended Value
85
51
25.5
25.5
25.5
34
3
/h" is known:
Theater or
Restaurant
Cinema Hall
1 - 2
0.4 - 0.6
1.5
0.5
Minimum Value
51
42.5
17
20
17
17
25.5

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