U-9
CHAPTER 1
•
Ventilation for Healthy Living
5. Outdoor Air (ventilation) Load
5.1 How to Calculate Each Approximate Load
5.1 A (US unit)
The ventilation air load can be calculated with the following formula if the required ventilation intake volume “Q CFM” is known:
(Ventilation air load) =
γ
· Q
F
· (i
O
- i
R
)
=
γ [lb/ft
3
] × S[ft
2
] × k × n [occupant/ft
2
] × Vf [CFM / occupant] × (iO - iR): ∆i [Btu/lb]
γ
: Specific air gravity - 0.0749 lb/ft
3
S : Building’s airconditioned area
k : Thermal coefficient; generally 0.7 - 0.8.
n : The average population concentration is the inverse of the occupancy area per person. If the number of persons in the
room is unclear, refer to the Floor space per person table below.
Vf : Ventilation air intake volume per occupant
Refer to the Required ventilation air intake volume per occupant table below.
i
O
: Ventilation air enthalpy - Btu/lb
i
R
: Indoor enthalpy - Btu/lb
Floor Space per Occupant (ft
2
)
(According to the Japan Federation of Architects and Building Engineers Associations)
Required Ventilation Air Intake Volume Per Occupant (CFM per occupant)
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.
Office Building
Department Store, Shop
Restaurant
Theater or
Cinema Hall
Average
Crowded
Empty
General Design
43 - 75
5.4 - 21.5
5.4 - 21.5
54 - 86
10.8 - 21.5
4.3 - 6.5
Value
54
32.3
10.8
64.6
16.1
5.4
Amount of Cigarette Smoking
Application Example
Required Ventilation Volume
Recommended Value
Minimum Value
Extremely Heavy
Broker’s office
Newspaper editing room
Conference room
50
30
Quite Heavy
Bar
Cabaret
30
25
Heavy
Office
Restaurant
15
10
12
Light
Shop
Department store
15
10
None
Theater
Hospital room
15
20
10
15
Summary of Contents for Lossnay LGH-F1200RX5-E
Page 2: ...Y11 001 Jun 2012 MEE ...
Page 7: ......
Page 8: ...Lossnay Unit ...
Page 9: ......
Page 10: ...CHAPTER 1 Ventilation for Healthy Living ...
Page 23: ......
Page 24: ...CHAPTER 2 Lossnay Construction and Technology ...
Page 30: ...CHAPTER 3 General Technical Considerations ...
Page 45: ......
Page 46: ...U 37 CHAPTER 4 Characteristics CHAPTER 4 Characteristics ...
Page 59: ......
Page 60: ...CHAPTER 5 System Design Recommendations ...
Page 67: ......
Page 68: ...CHAPTER 6 Examples of Lossnay Applications ...
Page 79: ......
Page 80: ...CHAPTER 7 Installation Considerations ...
Page 83: ......
Page 84: ...CHAPTER 8 Filters ...
Page 90: ...CHAPTER 9 Service Life and Maintenance ...
Page 93: ......
Page 94: ...CHAPTER 10 Ventilation Standards in Each Country ...
Page 99: ......
Page 100: ...CHAPTER 11 Lossnay Q and A ...