[TRNSYS-users] strange QHEAT

Tue Jul 12 02:16:58 PDT 2011

Dear all,

  I made a small simulation compared TRNSYS with theory calculation results
about QHEAT. But the QHEAT curve is a little strange. PLEASE see the
ATTACHEDs 1st,2nd and 3rd which include *.tpf, *.bui and online-plotter
files.

1) Known conditions:
Tindoor=20C=Initial Tindoor (livingroom)
Toutdoor=10C=Initial Toutdoor=Tboundary walls (5 walls)
only one wall next to the another zone (kitchen)
no solar and internal etc. gains
no infiltration
Massless walls

>From the online plotter, you can see at the beginning of the QHEAT about 7
hours, it fluctuates very frequently. Please tell me some possible reasons
about it! I kept Tindoor and Toutdoor as constant, why QHEAT is not a
Constant?

2) Still this simulation, I defined Mass-effect walls and without
infiltration. PLEASE see the ATTACHEDs 4th, 5th and 6th which include *.tpf,
*.bui and online-plotter files.
I compared TRNSYS with theory calculation results about QHEAT. But the
TRNSYS-QHEAT result during 24h is only 6300 kJ, however, theory result is
24000 kJ. Some experts told me the reason is TRNBUILD's PROPERTIES' AVERAGE
SURFACE TEMPERATURE TEMP. as 293.15K, the walls storage a lot of thermal
energy, so QHEAT is 6300 kJ smaller than 24000 kJ. But I changed it as
283.15 K the same as Toutdoor, however, the result is still 6630 kJ. So I'm
confused. Please tell me some possible reasons about it! BUT I simulated
during one month, the result is 30*23951 kJ, it seems the similar to the
theory result 24000 kJ. What're the reasons about it?

These two questions FEAZE me about more than 6 months, so please help me！

Mant thanks in advance!

br

wang

2011/7/12 <trnsys-users-request at cae.wisc.edu>

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>   1. two unexpected errors (Kundert de Wit)
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> From: Kundert de Wit <kwit at dwa.nl>
> To: "'trnsys-users at cae.wisc.edu'" <trnsys-users at cae.wisc.edu>
> Date: Tue, 12 Jul 2011 07:11:49 +0000
> Subject: [TRNSYS-users] two unexpected errors
>
> Hello,****
>
> ** **
>
> I am simulating 30 years of hourly data with TRNSYS. Around hour 450000, I
> get the error ‘Range check error’. When I switch on the debug mode, I get
> the error ****
>
> ** **
>
> ‘An OUTPUT from the specified component model has been written to the
> global OUT array in a location beyond the allocated number of outputs from
> this model. Please check the component carefully to insure that INFO(6) is
> set correctly. The simulation has been aborted to avoid problems caused by
> over-writing the outputs from other component models’. The model where this
> error refers to, has the correct nr of outputs specified in the code…****
>
> ** **
>
> However, this error isn’t there when I switch the debugger off.****
>
> ** **
>
> What can I do to fix these errors?****
>
> ** **
>
> With kind regards****
>
> Kundert de Wit
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