Function of static pressure box:

1. Being able to convert some dynamic pressure into static pressure, allowing the wind to blow farther;

2. Can reduce noise;

3. Uniform distribution of air volume;

4. Static pressure box can be used to reduce noise and obtain uniform static pressure air outlet, reducing dynamic pressure loss. And it also serves as a universal connector. Effectively applying the static pressure box to the ventilation system can improve its inductive function;

What is the accounting method for NR curve? Let's not talk about acoustic accounting, let alone P601. The input of netizens' words is for reference only (ranking is not in any particular order)!

1. When planning a static pressure box, if the wind speed is planned according to the rules, the box will be very large; A typical static pressure box should have a width of 400mm on the long side and a width of 400mm on the height of the air duct. The values were obtained from the York Planning Manual, which is the budget.

2. The experience of experienced engineers in static pressure chambers is usually 5-10dB (a)/m, while impedance composite type (similar to air conditioning and ventilation systems) mufflers have a density of 10-15dB (a)/m.

3. Control the wind speed within 2.5. If the volume is too large, you can increase the wind speed appropriately. There are generally no other mandatory requirements for lengths greater than 1 meter.

4. Height x depth=cross-sectional area of the static pressure box, and cross-sectional area of the static pressure box x 2.5m/s=fan air volume. As for how to match height and depth, you can master it yourself~~

5. Using the air volume of your unit L ÷ 3 meters/second, you can obtain the area of one side of your static pressure box. Then, based on the height of your house, if it is 4 meters, but your unit is 2 meters high, subtracting the soft joint by about 0.5 meters, leaving a height of 0.5 meters above it, your static pressure box is only 1 meter high. Then you can determine the width. With two numbers, the third number can be easily determined. The most important thing here is to see if your air conditioning room has enough orientation. If it has enough orientation, try to make it as large as possible!! The calculation method for length is also the same. If you know the width, isn't multiplying your width by length also an area? This area should also be equal to L/3, but the surface wind speed in the planning institute is set at 2m/s. If there is enough space, let's make it bigger.

6. The thickness of the static pressure box should be greater than 600mm, and the cross-sectional wind speed should be less than 2m/s. Also, pay attention to the air flow buffer zone between the outlet direction and the inlet direction. When I was at the grassroots level in Shanghai and East China Institute, my senior brother told me that the CEO of East China Institute strongly does not recommend using a static pressure box because it is expensive and has high resistance. If possible, try to use pants tees with noise reducing elbows or pipe silencers.

7. The CEO's idea from East China Institute is that I have seen many such plans. At first, I didn't understand why they didn't need a static pressure box. In fact, the static pressure box they were referring to was only an iron box, not a static pressure box with sound-absorbing cotton attached. The cost may not be very important. If it is really a static pressure box with sound-absorbing cotton attached, then we need to consider the cost carefully. For other mufflers, we need to pay attention to the control of flow velocity. Most of them are controlled within 8m/s. As long as we can achieve this value, the sound-absorbing effect is also good.

8. I think it is necessary to use a static pressure box for noise reduction. As the monk Palm Tree said, it is sometimes difficult to connect pipes without using a static pressure box in the computer room. Noise reduction is only secondary, and the cross-sectional wind speed should be preferably less than 1.5m/s, and the aspect ratio should be as small as 1:4 as possible; As for resistance, in fact, the vast majority of planners understand that compared to the calculated value of duct resistance, the fan I chose is definitely strong.

9. The function of a static pressure box is to convert dynamic pressure into static pressure, evenly distribute air volume, and is commonly used in front of slit air vents.

10. I remember that the technical measures compiled by Beijing Construction Institute seem to state that, based on the total air volume, the speed passing through any of the three sections must not exceed 1.5m/s

11. I usually choose a speed of around 4 meters per second. For example, in a shopping mall, the air volume of the fan cabinet is 24000, the size of the static pressure box is 2000 * 600 * 600, and it is covered with sound-absorbing cotton. The air conditioner has been running for a year and its function is not limited

12. The primary function of a static pressure box is to stabilize and reduce noise. According to the standard, the wind speed inside the static pressure box should not exceed 2.5m/s. The volume of the static pressure box can be determined based on the air volume and wind speed, and it is usually customized. The width direction should not be less than 500mm. Usually, the size of the static pressure box should be slightly smaller than that of the indoor unit.

13. Select floor air supply, and choose two types of static pressure boxes: one is to use a mezzanine as the static pressure box, and the air conditioning planning of the computer room often uses anti-static floor and floor mezzanine space as the static pressure box for air supply; Another option is to use a regular static pressure box and connect several air ducts to the air supply outlet on the static pressure box.