GPM Calculation Formula?

[GoWithGusto]

I'm having trouble with a few CRAH units at a data center that I suspect are not putting out their rated tonnage. I'm trying to calculate the actual GPM so I can put that into a tonnage calc (which I have the formula for). I just can't remember the GPM calc formula. Is there anyone that can share that? I know it's something like <<<< the square root of Design ^P / Actual ^P >>>> or maybe actual / design and I can't remember if there is a coefficient to be used. I can't seem to find it anywhere on the interwebs either.

Thanks in advance for any help.

[dan sw fl]

I'm having trouble with a few CRAH units at a data center that I suspect are not putting out their rated tonnage.

I'm trying to calculate the actual GPM
so I can put that into a tonnage calc (which I have the formula for). I just can't remember the GPM calc formula. Is there anyone that can share that?

I know it's something like <<<< the square root of Design ^P / Actual ^P >>>> or
maybe actual / design and
I can't remember if there is a coefficient to be used.

I can't seem to find it anywhere on the interwebs either.

Thanks in advance for any help.

It is an observation, not a calculation.

GPM is read from the flow rate gauge on the piping.


...........
https://bellgossett.com/literature-library/

[R123]

Actual GPM = Square root of (actual PD / design PD) x design GPM

[GoWithGusto]

Actual GPM = Square root of (actual PD / design PD) x design GPM

That's what I was looking for! thanks.

[dan sw fl]

Actual GPM = Square root of (actual PD / design PD) x design GPM

___ ___ ACTUAL GPM is read from the flow rate gauge on the piping.

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WHERE would one discover the Actual PD?

Where is the Actual PD gauge mormally nounted?