fan selection

[keyhanafshar]

<dear all,

i hava an industrial hall with 45,000 meter cube volume which must be kept 4 degree c above the ambient which is 40 degree C as design temperature, i have come up with fan size of 160,000 meter cube/hour please somebody check it and let me know what will be the power consumption of such huge fan?

 

[quark]

We can provide you some pointers so that you can check this on your own(as per the site policies).

Fan BHP = Air Flow (in cfm) x DP across fan (in inches WC)/(6356 x eff. of fan)

Fan kW = Air Flow (in Cu.M/Sec) x Dp across fan (in kPa)/eff. of fan

Include transmission(100% for direct coupled fans) and motor efficiency to get motor power rating.

Regards,


Eng-Tips.com : Solving your problems before you get them.

 

[ChasBean1]

What if you just used heaters instead? Hopefully no people have to work in there.

 

[lilliput1]

The outside air you bring in will see the following loads:
- heat from the fan
- heat from the lights
- heat from solar loads through glass
- heat from transmission through walls & roofs
- heat from people inside
- heat from equipment inside
You need to list Btu/hr loads from each.
then calculate CFM = (total Btu/hr loads) / (1.1 x Td °F)

You have to do a trial & error for the fan heat so the fan bhp will match the fan size required to provide the required CFM.

Fan bhp = (CFM x TP in. wg) / (6344 x Eff)

Where TP = in. wg fan total pressure
Eff = decimal efficiency you can use 0.65 as a good approximation

Fan heat in Btu/hr = Fan bhp x 2545

 

[rogzog]

What are you cooking in there? Sure will be too hot for people for any length of time.

Here is a link to a pdf file that might help you understand all of the variables to consider in your fan selection.

http://www.greenheck.com/pdf/centrifugal/fan_fundamentals.pdf