[TRNSYS-users] Strange Opening Factor (OF) of Window
David BRADLEY
d.bradley at tess-inc.com
Fri Sep 30 07:53:44 PDT 2011
Wang,
I will preface this by mentioning that I am not an expert in the
TRNFlow part of Type56.
It is a little hard to know what is going on without knowing anything
about the building. However, if you have multiple zones in the building,
I imagine that there would be some air mixing going on between zones due
to internal temperature and height differences and the CO2 concentration
would decrease in one zone while increasing in another.
I would also recommend looking at the COMIS documentation (COMIS is
the engine that underlies TRNFlow) to see whether its algorithms are
trying to predict CO2 concentration at a particular point in the space
(like we do in Type56 for comfort calculations at a particular point in
a zone) or whether it is assuming a fully mixed zone as far as the CO2
level is concerned. If COMIS is calculating concentration at a point and
the air continues to mix after your opening factor has gone to zero then
that might explain the decrease.
Lastly, your mechanical ventilation system might have something to do
with the decrease; If you are actively supplying air to the space after
the opening factor is zero and if the mechanical ventilation system has
some outdoor air associated with it then that also would explain the
decrease in CO2 level.
Regards,
David
On 9/30/2011 08:47, 王洋 wrote:
> Dear all,
> I simulated CO2 concentration changes using TRNFlow. But there is
> a STRANGE phenomenon. There are 2 occupants from 8am to 6 pm, CO2% is
> controlled by PID controller which controls Opening Factor (OF) of
> window at the set-point 1000 ppm. From 6 pm, there are no occupants,
> OF is 0, there is no infiltration in TRNBuild (Certainly, infiltration
> in TRNBuild indeed will inactivate when couping TRNFlow based on
> TRNFlow Manual). However, from 6 pm, CO2% begins to decrease. It's
> extremely strange!
> Which relative expert can expain that? Or give me some advices for
> that? I am puzzled for a long time.
> Many thanks in advance!
> br
> wang
>
> 2011/9/30 <trnsys-users-request at cae.wisc.edu
> <mailto:trnsys-users-request at cae.wisc.edu>>
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> Today's Topics:
>
> 1. Using Excel as Load Profile (Pei Ru Chao)
> 2. TRNSYS error 300 (torres.carlos-moises at lte.ireq.ca
> <mailto:torres.carlos-moises at lte.ireq.ca>)
> 3. Direct expansion solar collector (Mohamad Azly Abd Aziz (Ir))
> 4. simulation studio crash when updating project (Antoine Gautier)
>
>
> ---------- 已转发邮件 ----------
> From: Pei Ru Chao <simplica1 at hotmail.com
> <mailto:simplica1 at hotmail.com>>
> To: TRNSYS <trnsys-users at cae.wisc.edu
> <mailto:trnsys-users at cae.wisc.edu>>
> Date: Fri, 30 Sep 2011 16:31:53 +1000
> Subject: [TRNSYS-users] Using Excel as Load Profile
> Hi all,
>
> As a newbie I am wondering how to use Excel for load profile
> input. Can anyone point me in the right direction as to how to use
> a Data Reader to do this? For example, can the Data Reader read
> 10920 rows of data? In 9a for example, Parameter 2 asks how many
> values of input to read and the maximum is only 98?
>
> Thanks
>
> Pei
>
>
>
>
> ---------- 已转发邮件 ----------
> From: <torres.carlos-moises at lte.ireq.ca
> <mailto:torres.carlos-moises at lte.ireq.ca>>
> To: <trnsys-users at cae.wisc.edu <mailto:trnsys-users at cae.wisc.edu>>
> Date: Thu, 29 Sep 2011 15:50:36 -0400
> Subject: [TRNSYS-users] TRNSYS error 300
> Dear all,
> Whenever I ry to run a type 56 simulation in TRNSED I am given the
> following error even though the same program runned perfectly in
> TRNEdit
> ***** ERROR ***** TRNSYS ERROR # 300
> UNABLE TO START PROGRAM IN CALLPROGRAM UTILITY
> PLEASE CHECK PATH AND PROGRAM NAME, THIS MAY BE A PROBLEM IN TYPE 66
>
> *** Fatal Error at time : 0.000000
> Generated by Unit : Not applicable or not available
> Generated by Type : Not applicable or not available
> TRNSYS Message 300 : The TRNSYS Program attempted to
> evaluate an EQUATION that raised a negative number to a
> non-integer value. Please check the EQUATION formulation and
> re-run the simulation
> Reported information : Not available
> the message is not very helpfull and I don't even use Type 66 in
> my simulation and I checked all my equations and nothing obvious
> comes to view.
> Is there any known solution to this problem? If need be I can send
> you the files im using.
> Thank you
> Carlos Torres
> Stagiaire universitaire
> Laboratoire des technologies de l'énergie (LTE)
>
>
> ---------- 已转发邮件 ----------
> From: "Mohamad Azly Abd Aziz (Ir)" <AZLY at jkr.gov.my
> <mailto:AZLY at jkr.gov.my>>
> To: "trnsys-users at cae.wisc.edu <mailto:trnsys-users at cae.wisc.edu>"
> <trnsys-users at cae.wisc.edu <mailto:trnsys-users at cae.wisc.edu>>
> Date: Fri, 30 Sep 2011 04:36:25 -0700
> Subject: [TRNSYS-users] Direct expansion solar collector
>
> Hi
>
> I wonder whether someone has come-out with heat pump type with
> direct expansion solar collector/evaporator?.
>
> Regards
>
> Azly
>
>
>
> ---------- 已转发邮件 ----------
> From: "Antoine Gautier" <antoine.gautier at solamen.fr
> <mailto:antoine.gautier at solamen.fr>>
> To: <trnsys-users at cae.wisc.edu <mailto:trnsys-users at cae.wisc.edu>>
> Date: Fri, 30 Sep 2011 13:48:10 +0200
> Subject: [TRNSYS-users] simulation studio crash when updating project
>
> Dear all
>
> I cannot update my project any more without crashing simulation
> studio (*.tpf and *.b17 in attachment).
>
> Is there another way to update the input list for Type56 so that I
> can keep on working?
>
> Thanks a lot for your help.
>
> Best regards
>
> --
>
> Antoine Gautier
> Solamen
> +33 6 98 78 56 46 <tel:%2B33%206%2098%2078%2056%2046>
>
> antoine.gautier at solamen.fr <http://lamen.fr/>
>
>
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--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com
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