Coil Pressure Drop with Change in Flow Rate

[Chris]

Hi all,

Pressure drop through a coil is 93kPa with a flow rate of 27kg/s -If this changes to 30 kg/s what is the simplest way to calculate the revised pressure drop?

Thanks,

 

[RVAmeche]

A quick and dirty approximation is

Q = (25AK)*sqrt(h) Where
Q = flow (GPM)
h = head loss (ft)

Using your two data points, 0 flow = 0 loss and the data point you listed, you can interpolate losses at other flows.

You may need to convert to these units, but the concept is the same in other units.

 

[Latexman]

[Δ]P [∝] velocity²

93 x (30/27)² = 115 kPa

Good luck,
Latexman

To a ChE, the glass is always full - 1/2 air and 1/2 water.

 

[LittleInch]

Pressure drop is proptional to flowrate ^2 if all other parameters the same.

So about 23% increas in your case.

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