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I haven't drawn a 3D building but used the building wizard at start up. <br>
There is one thing in the type109 I really dont get and that is the azimuth input which isn't values but text.<br>
<br>
I will print the radiation outputs and check for negative values.<br>
I'll be in touch when I'm done.<br>
<br>
Best regards<br>
Richard<br>
<br>
<div id="htc_header" style="">----- Reply message -----<br>
Från: "David BRADLEY" <d.bradley@tess-inc.com><br>
Till: "Richard Thygesen" <richard.thygesen@mdh.se><br>
Kopia: "TRNSYS-users@engr.wisc.edu" <TRNSYS-users@engr.wisc.edu><br>
Rubrik: [TRNSYS-users] negative radiation one 1 surface in type 56<br>
Datum: ons, jun 13, 2012 17:41<br>
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<div>Richard,<br>
The equation would probably work but I would try to hunt down the cause of the problem. When I have gotten this error, it is usually because I have messed something up about the orientation of the building; when I draw a building in Trnsys3D, I often draw
it facing plan north (instead of true north) so I have to correct for that when I implement the building in the Studio. Look at the "turn" equation in the 3D_building example for how this can be accomplished.<br>
<br>
A second possibility is a bad connection to Type56. Type56 takes total and beam radiation. If you give it a beam radiation and forget to connect the total radiation, Type56 will compute that there is a negative amount of diffuse radiation on the surface.<br>
<br>
The other possibility is that there is actually a problem in the weather reading / processing component. To check this, remove the building from your project and put an online plotter on the radiation outputs of the weather reader. Check and make sure that
they never go negative. If they do, please send me that project so that we can get it fixed.<br>
<br>
Kind regards,<br>
David<br>
<br>
<br>
On 6/13/2012 06:56, Richard Thygesen wrote:
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<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Hi again.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">I guess it would be possible to solve this problem with an equation which never sends any negative values to type 56. What do you think about that?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Does that only cure the symptoms but not the problem?
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Best regards<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D;mso-fareast-language:SV">Richard Thygesen<o:p></o:p></span></b></p>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-language:SV">Från:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-language:SV"> Richard Thygesen
<br>
<b>Skickat:</b> den 13 juni 2012 12:53<br>
<b>Till:</b> <a class="moz-txt-link-abbreviated" href="mailto:TRNSYS-users@engr.wisc.edu">
TRNSYS-users@engr.wisc.edu</a><br>
<b>Ämne:</b> [TRNSYS-users] negative radiation one 1 surface in type 56<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I have gotten an error message in my simulation stating that one surface in Type 56 have negative radiation.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">This happened when I changed the sky model for diffuse radiation from Perez to Hay and Davies.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Has anyone encountered this problem before? How can I solve this?
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I am using Trnsys version 17.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal">Best regards<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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David BRADLEY
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22 North Carroll Street - suite 370
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