<br>Dear Leen, Jean, Marion, Benoit and others,<br><br>Many thanks for your reply!<br><br>I checked my Wall's thickness and thermal property etc. again. Why needs it 9 hours as the timebase? I think maybe it is due to my Ground floor (it is the basement's floor of the building) which includes about 0.99 m's Air Layer.<br>
When I changed it into 0.1 m, the min. timebase 2.5 hours can work without the ERROR:Error creating the wall transfer function coeffients.<br><br>Therefore, I'd like to ask you, <br>1) Is it normal for TRNBuild setting how large the timebase is maximally? 5 hours or others?<br>
2) How to solve this problem of the ground floor with about 0.99 m's Air Layer? But our building project indeed has<br> the ground floor with about 0.99 m's Air Layer. I can't reduce it into 0.1m? Is the only way to <span style="color:rgb(51,51,255)"> try the active layer approach of The group of Michael Kummert in Montreal</span>? <br>
<br>Please see the Attached INF file.<br><br>Thanks in advance!<br>Br.<br><br>wang<br><br><br><div class="gmail_quote">2012/11/17 Benoit Delcroix <span dir="ltr"><<a href="mailto:benoit.delcroix@polymtl.ca" target="_blank">benoit.delcroix@polymtl.ca</a>></span><br>
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<div>Hello,<br>
<br>
I'm one of the students of Michaël Kummert working on a new method
to generate the tranfer functions. I thing I can help you for your
problem. As Leen said, TRNSYS is unable to generate the transfer
functions coefficients for a heavy and insulated wall with a low
timebase. In the TRNBuild project, you can modify that value and
increase it to allow TRNSYS to generate the transfer functions.
Actually, TRNSYS is unable to generate the transfer function as
soon as the Fourier number of the wall (thermal diffusivity *
timebase / thhickness²) is lower than 0.0005. To check that,
TRNBuild make the sum of one of the coefficients series (a, b or
c). The 3 sums are equal and means, according to TRNBuild (I don't
personally think so...but it's like this), the Fourier number. <br>
<br>
As Leen said, it exists a trick. You can use an active layer to
split the wall in 2 and then forcing TRNSYS to generate 2 series
of transfer functions coefficients for the same wall. As the 2
parts are thinner, you could use a better timebase value. When you
insert the active layer in the wall, try to split the layer with
the lowest Fourier number. And then to insert the active layer,
use the expert mode that allows you to insert an equivalent
conductivity. Insert the biggest value you can. Like that, the
active layer is negligible at the thermal point of view. Actually,
the active layer is acting as a mini-zone to split the wall. It is
a little tricky but it works...before having better solution.<br>
<br>
Good luck for your project and have a nice week-end,<br>
<br>
Benoit <br>
<br>
Le 2012-11-17 14:43, <a href="mailto:trnsys-users-request@cae.wisc.edu" target="_blank">trnsys-users-request@cae.wisc.edu</a> a écrit :<br>
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1. Re: Fwd: Error creating the wall transfer function coeffients
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