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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Dear TRNSYS users,
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<div>I am modelling a building with Type 56 where I input a heat gain from a MATLAB TABS model to a ceiling surface as "Surface Gain Inside". Now the simulation gives me the error "... pane temperature out of bounds at time [second time step]" of the two windows
in the zone (in the first timestep there is no heat flux as all initial temperatures are 20°C).</div>
<div>But when I divide my heat gain surface input by a factor of 10 in the MATLAB model it works. The total heat gain is then listed as roughly 750 kJ/h which is about 200 W (not much for a heating system, right?). The thing is, if I now input a constant heat
gain I can go up to values of 7.5e6 kJ/h and the simulation starts running (later there is of course an error as something isn't realistic). But somehow if I input my MATLAB model output without dividing by a factor of 10 it doesn't work. I would expect my
real heat gain without the division by 10 to be 7500 kJ/h (~2 kW) which is also realistic and nowhere near the possible constant 7.5 kJ/h I've tried.</div>
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<div>Additionally, when I receive the error I get no output data for the second timestep, so I can't see how much my heat gain would've been. It seems TRNSYS runs into an error even before incorporating the heat gain from my MATLAB model.</div>
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<div>I've tried the first of the following steps suggested in the archive but it didn't work. I haven't tried 2 and 3 as I don't think they could change anything:</div>
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<pre>"1) Set the TSKY= Tamb the most common mistake is a wrong sky temperature
2) look in the bui-file which orientation the window (surface17 zone 2) has.
Set the radiation for this orientation to 0 to check if there is a wrong connection.
3) check the raditive part of your heating and gains"</pre>
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<pre>Any help is greatly appreciated.</pre>
<pre>Best Regards,</pre>
<pre>Daniel Weber</pre>
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