[TRNSYS-users] b18 doesn't work

Thu May 20 09:35:02 PDT 2021

Karol,

It seems that Type 56 cannot cope with the very high values for convection
coefficients that you have for the adjacent window. If you change those to
100 kJ/h-m²-K or less the simulation runs normally (i.e. heating seems to do
something). 

With intermediate values (e.g. 500) the simulation stops with errors that
say convergence cannot be reached inside Type 56 for heating, so maybe
that’s what is also happening in your original simulation, although there is
no trace of the problem in warnings or errors. 

Michaël Kummert

Polytechnique Montréal

From: TRNSYS-users <trnsys-users-bounces at lists.onebuilding.org> On Behalf Of
Karol BANDURSKI via TRNSYS-users
Sent: May 20, 2021 11:35
To: 'David BRADLEY' <d.bradley at tess-inc.com>; 'TRNSYS users mailing list at
OneBuilding.org' <trnsys-users at lists.onebuilding.org>
Cc: Karol BANDURSKI <karol.bandurski at put.poznan.pl>
Subject: Re: [TRNSYS-users] b18 doesn't work

David,

Thank you for hint with CompareIt. All changes which you discover are known
for me and unfortunately don’t solve my problem.

Are you try to run simulation on your computer? Do you see the same problem
(heating and cooling doesn’t work)?

It is very strange

Best,

Karol

From: David BRADLEY [mailto:d.bradley at tess-inc.com] 
Sent: Thursday, May 20, 2021 4:43 PM
To: TRNSYS users mailing list at OneBuilding.org
<trnsys-users at lists.onebuilding.org
<mailto:trnsys-users at lists.onebuilding.org> >
Cc: Karol BANDURSKI <karol.bandurski at put.poznan.pl
<mailto:karol.bandurski at put.poznan.pl> >
Subject: Re: [TRNSYS-users] b18 doesn't work

Karol,

 I have noticed some similar behavior in TRNBuild. It does not seem to be
systematic apart from the zone's thermal capacitance which always gets set
back to its default value during the process. When I export a *.b18 to an
*.idf, make changes, and then reimport back to a *.b18 I usually take a look
at the before and after versions of the *.b18 using a text compare tool (I
use CompareIt but there are many others). 

 In your file it looks like a new HEATING type got added (HEAT002) and that
the heating in zone "parter" got changed from HEAT001 to HEAT002. The set
point temperature for HEAT001 and HEAT002 are the same though so I would
have expected the behavior to be the same before and after the changes that
you made in the *.idf. 

The other change I notice is in the windows; two unused WINDOW types were
removed and one new one was added.

I'm not sure that any of the above will help but I hope it does!

best,

 David

On 05/20/2021 04:17, Karol BANDURSKI via TRNSYS-users wrote:

Dear Experts,

I have problem with my b18 file (I use demo version).

The first model consist of 2 floors connected partially by Virtual Surface
and partially by visible surface. In this model I have set heating, cooling,
ventilation.

Then I have export model to .idf to change VirtualSuface to partition with
ADJ_WINDOW in SketchUp.

When I upload new building model and set in my general model settings of
heating and cooling don’t work – temperature is not kept

Do you know what is the reason?

I enclose both building models (bud1_light and bud2_light) and general
model.

Kind regards,

Karol 

--------------------------------------------------------------------

Karol BANDURSKI Ph.D.

Faculty of Environmental and Energy Engineering

Division of Heating, Air Conditioning and Air Protection

Poznan University of Technology

 <https://www.researchgate.net/profile/Karol_Bandurski>
https://www.researchgate.net/profile/Karol_Bandurski

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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA

P:+1.608.274.2577
d.bradley at tess-inc.com <mailto:d.bradley at tess-inc.com> 

http://www.tess-inc.com
http://www.trnsys.com
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