40
CHAPTER 4
●
Characteristics
1. How to Read the Characteristic Curves
1.1 Obtaining characteristics from static pressure loss
(1)
Static pressure loss from straight pipe duct length (at required air volume)
(2)
Static pressure loss at curved section (at required air volume)
(3)
Static pressure loss of related parts (at required air volume)
Total static pressure loss
Estimated static pressure loss curve
obtained from
1
and
2
3
Air volume
Static
pressure
4
Intersection with air volume static
pressure characteristic curve
5
Air volume at application point
2
Total static
pressure loss
6
Static pressure loss at
application point
1
Required air
volume
2. Calculating the Static Pressure Loss
2.1 How to read the air volume - static pressure curve
It is important to know the amount of static pressure loss applied
onto the Lossnay when using parts such as ducts for the air
distribution. If the static pressure increases, the air volume will
decrease. The air volume - static pressure curve (Q-H curve)
shows this percentage. A static pressure of 19.6 Pa is applied on
to point A, and the air volume is 500 m
3
/h. The duct resistivity
curve shows how the static pressure is applied when a duct is
connected to the Lossnay. Thus, the L = 9.97 m duct resistivity
curve in the diagram is the curve that shows how the static
pressure is applied when a 10 m duct is connected. The
intersecting point A with the Lossnay Q-H curve is the operation
point.
Duct resistivity curve
The duct resistivity curve shows how much static pressure a duct will apply on the Lossnay, as explained above.
In general, the interrelation between the duct and static pressure is as follows:
500 m
3
/h
19.6 Pa
L = 10m
A
20 m
15 m
10 m
5 m
Duct
Static pressure
When duct is long
Increases
If length is the same but the air volume
Increases
increases
If the duct diameter is narrow
Increases
If the duct inner surface is rough
Increases
(such as a spiral)
Q-H curve
Static pressure
Duct resistivity curve
Air volume
Air volume
Static pressure
(Duct length)
Содержание Lossnay PZ-41SLB-E
Страница 4: ...CHAPTER 1 Ventilation for Healthy Living Lossnay Unit ...
Страница 17: ......
Страница 18: ...CHAPTER 2 Lossnay Construction and Principle ...
Страница 24: ...CHAPTER 3 General Technical Considerations ...
Страница 41: ......
Страница 42: ...CHAPTER 4 Characteristics ...
Страница 56: ...53 CHAPTER 4 Characteristics ...
Страница 57: ...54 CHAPTER 4 Characteristics ...
Страница 59: ......
Страница 60: ...CHAPTER 5 System Design Recommendations ...
Страница 68: ...CHAPTER 6 Examples of Lossnay Applications ...
Страница 83: ......
Страница 84: ...CHAPTER 7 Installation Considerations ...
Страница 88: ...CHAPTER 8 Filtering for Freshness ...
Страница 96: ...CHAPTER 9 Service Life and Maintenance ...
Страница 98: ...CHAPTER 10 Ventilation Standards in Each Country ...
Страница 101: ......
Страница 102: ...CHAPTER 11 Lossnay Q and A ...
Страница 108: ...Lossnay Remote Controller ...
Страница 109: ......
Страница 197: ...MEMO ...
Страница 198: ...Y04 002 Jul 2004 MEE ...