Ventilation issues in low-voltage distribution rooms
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This post was last edited by li*ch1968 on 2010-6-26 at 19:56. Dear sea friends: There is a low-voltage distribution room on the first floor of the factory building. The height is about 7.5 meters. The area is approximately 50 square meters. I now want to install an exhaust fan. But I don’t know how many to install, and I can’t determine the installation location. I really hope everyone can help and give me some advice. Thank you all.
First, calculate the total air volume by multiplying the number of ventilation cycles by the volume, and then you can select the model and quantity of fans.
Reply to 2# li*ch1968: May I ask how to calculate it?
You should calculate the exhaust volume required for the equipment based on factors such as the layout of the equipment within the distribution room, the number of devices, the heat generation per device, the orientation of the distribution room, as well as the number and size of doors and windows. Additionally, the exhaust volume needed to accommodate the space itself in the distribution room must also be taken into account in order to determine the accurate design parameters. The parameters you have listed are insufficient; therefore, it is not possible to provide you with accurate calculation values.
If the quality of outdoor air is good, it is possible to consider reducing investment by installing exhaust fans. But it tends to accumulate dust, which is detrimental to operational safety ； If the quality of outdoor air is not satisfactory, it is best to use a packaged air conditioning unit; the initial investment is high, but the operation is stable and reliable! Most importantly, the equipment manufacturers can help you calculate the air supply and exhaust volumes for free! !
I have recently secured several contracts for industrial air conditioning systems in factory substations. If the device generates little heat and the outdoor air is clean, exhaust ventilation can be used ； If a large amount of heat is generated, heat will accumulate in the electrical room, raising the temperature to such an extent that it may cause certain electrical components to burn out; it is better to use air conditioning rather than a chilled water system.
Installing two No. 4 axial flow fans at appropriate locations on the top of the enclosure should solve the problem.
Reply to 7# swanblc: An appropriate location? Could you be more specific? For example, the height above the ground, the distance from the wall?
It mainly depends on the height of the wall; generally, 1.5m to 2m above the roof should be sufficient.
Generally, 1-2 meters from the roof is sufficient; an axial flow fan with an air volume of 1-2000 is adequate.
The number of ventilation cycles is set at 10 times per hour; the ventilator is installed at the top of the exterior wall, and an air inlet rain shield is placed at the bottom of the exterior wall. The shield is located 500 mm above the ground level, with the wind speed not exceeding 2.5 m/s. This arrangement is sufficient for small distribution rooms.