Room Pressure Question

[rwelsh09]

Hi,

I am hoping someone here will now the answer to this.

Can we calculate the room pressure indirectly?

I will attach a photo to make things clear.

Thanks!

 

[Compositepro]

-2.5 Pa.

 

[GT-EGR]

Ditto

But this looks like a homework problem

 

[SAK9]

it will be -2.5 pa.But what you have is against the convention of referencing all pressures to a common datum such as the pressure in the ceiling void.Using different datum for different rooms is confusing.

 

[Compositepro]

Yes, it is somewhat misleading to call these numbers room pressures. They are pressure differentials.

 

[rwelsh09]

-2.5 Pa.

So, it's straight algebra? A + B = C
I wasn't sure if pressure behaved like this, I know that adding sounds together 1+1 ≠ 2

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Ditto

But this looks like a homework problem

I made this sketch in Visio. It represents rooms we are monitoring at work.

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Yes, it is somewhat misleading to call these numbers room pressures. They are pressure differentials.

You are correct, I should have called these pressure differentials. Knowing the differential in this case is a lot more important than specific room pressures.

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Thanks for all your help!

 

[lilliput1]

The real problem is how to implement these differentials. How well the room are sealed are big unknowns. Also what happens when any door is opened.