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elsikh
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Join Date: Oct 2012
Posts: 3

Transformer Room Ventilation

10/29/2012 10:15 AM

how to calculate the size of exctract fan for proper ventilation of transformer room
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PWSlack
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#1

Re: transformer room ventilation

10/29/2012 10:20 AM

Divide the flowrate through the fan by the room volume to obtain air-changes-per-hour. Compare the answer with the romm specification's requirements. If it is too low, increase the size of the fan or the numbers of fans until it is right. If it is too high, do the reverse.

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Codemaster
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#2

Re: Transformer Room Ventilation

10/30/2012 7:32 AM

1. Find out maximum heat shed by the transfomer.

2. Choose maximum ventilation air (inlet) temperature, depending on where you are in the world. Subtract from maximum allowable temperature in the room, to get ΔT.

3. Work out air flow needed to dissipate the heat. Air density is about 1.2 kg/m3, and specific heat 1 kJ/(kg*K). Use the right units!

4. Choose fan pressure to allow for fan inlet and discharge losses, and loss in room outlet louvre. 2.5 mbar usually OK.

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