[esp-r] Re: blowing door simulation test...

[Andrew Cowie]

Hi Nicolas,

1. By setting your nodes as fixed pressure, you can force a 50 Pa pressure difference. All you would then have to do is calibrate the crack width to correspond to 0.6ACH by trial and error. Beware however that this may not be representative of real situations.

2. I'm afraid there is no easy answer, this is up to you. If you are forcing the pressure difference as described above then this shouldn't make too much difference (unless you are relying on temperature dependant nat. vent. phenomena such as stack ventilation). If you want to be thorough, I would recommend running the simulations under a wide range of climate cases. However if you are not looking to go that far in-depth, there is functionality in the "cli" module for analysing climate data and determining average conditions; perhaps this would be useful to you.

3. In the "res" module, under network flow metrics, you can check the nodal pressures. This should allow you to confirm your 50 Pa pressure difference.

Hope this helps,

Cheers,
Andy Cowie


----- Reply message -----
From: "Nicolas Espinosa" <nico_espinosa19 at hotmail.com>
To: "esp-r at lists.strath.ac.uk" <esp-r at lists.strath.ac.uk>
Subject: [esp-r] blowing door simulation test...
Date: Fri, Mar 7, 2014 11:56



Dear esp-r users,

I am currently planning to build a passive house. I have entered the
geometry and I would like to calibrate correctly cracks through windows
to represent the passivhaus standard ie max 0.6AC at 50 Pa. I have started
to enter the air network following cookbook advices.
In terms of lengh of the crack I took 1/10 of the window perimeter. Now
it lasts to enter a crack width (common to all windows). This means that
for each window I will have a crack proportional to its perimeter.

I would like to make a kind of "blowing door" test to calibrate that
crack width and respect the 0.6AC at 50 Pa (so that means without heating
the house).
1) Is it something possible ? how should I proceed ?
fix a 0.6AC flow rate with a fixed extract volume and then adjust the
crack width accordingly  to get 0.5 Pa delta P?

2) What is the typical day I should do that test (spring day not too
hot, not too cold, not too wind ?). I imagine that the temperature plays
an important rôle . Should I control the heating/cooling of the house to
reach a constant temperature in all zones of the house while making that
"blowing door simulation test" ?

3) Where can we check that we are effectively @ 50 Pa delta P between
inlet of the building and outlet (pressure induced nodes)?

Thanks for your help.

Regards,
Nicolas

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