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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Hi David,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='text-align:justify'><span lang=EN-US style='color:#1F497D'>Great idea! Tightening the tolerance did make the result more accurate (not on point, but better). As always, thanks a lot for your help.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Best regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Yose Wandy<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:DE'>Von:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:DE'> David BRADLEY [mailto:d.bradley@tess-inc.com] <br><b>Gesendet:</b> Donnerstag, 5. November 2015 20:54<br><b>An:</b> TRNSYS users mailing list at OneBuilding.org; y.wandy@ostfalia.de<br><b>Betreff:</b> Re: [TRNSYS-users] Mistake in type 33i<o:p></o:p></span></p></div></div><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='margin-bottom:12.0pt'>Yose,<br> The psychrometrics routine has to use some iterative methods in order to solve for all the air properties when it is given certain combinations for which the properties cannot be determined directly. When RH and w are specified it has to iterate to find a drybulb temperature that has the same saturation pressure as the saturation pressure that can be computed directly from knowing RH and w. There are tolerances on the iterative calculations and with your two input values (RH=60% and w=0.006) the iteration continues until the saturation pressure for the guessed dry bulb temperature is within 0.01 kPa of the saturation pressure computed from RH and w. Tightening the tolerance on that iteration (which is one of a few iterations) causes the recomputed RH to come out closer to the starting value but I suspect that simply tightening the iterative tolerance would not always result in the recomputed value being equal to the starting value. <br>kind regards,<br> David<br> <o:p></o:p></p><div><p class=MsoNormal>On 11/05/2015 03:55, Yose Wandy wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal><span lang=EN-US>Hello TRNSYS experts,</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US>There seems to be a mistake in the type 33i, it modified the Inputs that I gave, resulting on wrong value (e.g. dry bulb temperature, enthalpy, etc.)</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:DE'>I attached a small example that shows the difference between the relative humidity input & output, in this case, it shows a difference by 0.09%.</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:DE'>Does it supposed to do that? Anybody have any idea how to fix it or get around it? Any help would be appreciated.</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:DE'> </span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:DE'>Thanks in advance.</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:DE'> </span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:DE'>Best regards,</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:DE'>Yose Wandy</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:DE'> </span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:DE'> </span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='color:#7F7F7F;mso-fareast-language:DE'>--------------------------------------------------------------------------------</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='color:#7F7F7F;mso-fareast-language:DE'>Yose Wandy B.Sc.</span><o:p></o:p></p><p class=MsoNormal><span style='color:#7F7F7F;mso-fareast-language:DE'>Wissenschaftlicher Mitarbeiter</span><o:p></o:p></p><p class=MsoNormal><span style='color:#7F7F7F;mso-fareast-language:DE'> </span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D;mso-fareast-language:DE'><img width=38 height=38 id="Bild_x0020_1" src="cid:image001.jpg@01D11AE1.F3B5B270" alt="Beschreibung: nur_logo_klein"></span><b><span style='color:#7F7F7F;mso-fareast-language:DE'>Ostfalia Hochschule für angewandte Wissenschaften</span></b><o:p></o:p></p><p class=MsoNormal><span style='color:#7F7F7F;mso-fareast-language:DE'>Hochschule Braunschweig/Wolfenbüttel</span><o:p></o:p></p><p class=MsoNormal><span style='color:#7F7F7F;mso-fareast-language:DE'>Fakultät Versorgungstechnik</span><o:p></o:p></p><p class=MsoNormal><span style='color:#7F7F7F;mso-fareast-language:DE'>Institut für energieoptimierte Systeme (EOS)</span><o:p></o:p></p><p class=MsoNormal style='line-height:13.05pt'><span style='color:#7F7F7F;mso-fareast-language:DE'>Prof. Dr.-Ing. Lars Kühl</span><o:p></o:p></p><p class=MsoNormal><span style='color:#7F7F7F;mso-fareast-language:DE'> </span><o:p></o:p></p><p class=MsoNormal><span style='color:#7F7F7F;mso-fareast-language:DE'>Salzdahlumer Straße 46-48</span><o:p></o:p></p><p class=MsoNormal><span style='color:#7F7F7F;mso-fareast-language:DE'>D - 38302 Wolfenbüttel</span><o:p></o:p></p><p class=MsoNormal><span style='color:#7F7F7F;mso-fareast-language:DE'> </span><o:p></o:p></p><p class=MsoNormal><span style='color:blue;mso-fareast-language:DE'><a href="http://www.ostfalia.de/v">www.ostfalia.de/v</a></span><o:p></o:p></p><p class=MsoNormal><span style='color:#7F7F7F;mso-fareast-language:DE'> </span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='color:#7F7F7F;mso-fareast-language:DE'>Tel. 0049 - 5331 / 939 – 40 550</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='color:#7F7F7F;mso-fareast-language:DE'>Fax 0049 - 5331 / 939 – 40 552</span><o:p></o:p></p><p class=MsoNormal><u><span lang=EN-US style='color:blue;mso-fareast-language:DE'><a href="mailto:y.wandy@ostfalia.de">y.wandy@ostfalia.de</a></span></u><o:p></o:p></p><p class=MsoNormal><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DE'><br><br><br><o:p></o:p></span></p><pre>_______________________________________________<o:p></o:p></pre><pre>TRNSYS-users mailing list<o:p></o:p></pre><pre><a href="mailto:TRNSYS-users@lists.onebuilding.org">TRNSYS-users@lists.onebuilding.org</a><o:p></o:p></pre><pre><a href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a><o:p></o:p></pre></blockquote><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:DE'><br><br><o:p></o:p></span></p><pre>-- <o:p></o:p></pre><pre>***************************<o:p></o:p></pre><pre>David BRADLEY<o:p></o:p></pre><pre>Principal<o:p></o:p></pre><pre>Thermal Energy Systems Specialists, LLC<o:p></o:p></pre><pre>22 North Carroll Street - suite 370<o:p></o:p></pre><pre>Madison, WI 53703 USA<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>P:+1.608.274.2577<o:p></o:p></pre><pre>F:+1.608.278.1475<o:p></o:p></pre><pre><a href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre><a href="http://www.tess-inc.com">http://www.tess-inc.com</a><o:p></o:p></pre><pre><a href="http://www.trnsys.com">http://www.trnsys.com</a><o:p></o:p></pre></div></body></html>