<html>
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
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>
<br>
<br>
<div class="moz-cite-prefix">On 11/05/2015 03:55, Yose Wandy wrote:<br>
</div>
<blockquote cite="mid:00be01d117b0$2729aa60$757cff20$@ostfalia.de"
type="cite">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 14 (filtered
medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]-->
<style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Sprechblasentext Zchn";
margin:0cm;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";
mso-fareast-language:EN-US;}
span.E-MailFormatvorlage17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.SprechblasentextZchn
{mso-style-name:"Sprechblasentext Zchn";
mso-style-priority:99;
mso-style-link:Sprechblasentext;
font-family:"Tahoma","sans-serif";}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";
mso-fareast-language:EN-US;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 2.0cm 70.85pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US">Hello TRNSYS experts,<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">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.)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"
lang="EN-US">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%.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"
lang="EN-US">Does it supposed to do that? Anybody have any
idea how to fix it or get around it? Any help would be
appreciated.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"
lang="EN-US">Thanks in advance.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"
lang="EN-US">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"
lang="EN-US">Yose Wandy<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#7F7F7F;mso-fareast-language:DE" lang="EN-US">--------------------------------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#7F7F7F;mso-fareast-language:DE" lang="EN-US">Yose
Wandy B.Sc.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#7F7F7F;mso-fareast-language:DE">Wissenschaftlicher
Mitarbeiter<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#7F7F7F;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:DE"><img
id="Bild_x0020_1"
src="cid:part1.03020809.08090501@tess-inc.com"
alt="Beschreibung: nur_logo_klein" height="38" width="38"></span><b><span
style="color:#7F7F7F;mso-fareast-language:DE">Ostfalia
Hochschule für angewandte Wissenschaften</span></b><span
style="color:#7F7F7F;mso-fareast-language:DE"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#7F7F7F;mso-fareast-language:DE">Hochschule
Braunschweig/Wolfenbüttel<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#7F7F7F;mso-fareast-language:DE">Fakultät
Versorgungstechnik<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#7F7F7F;mso-fareast-language:DE">Institut für
energieoptimierte Systeme (EOS)<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:13.05pt"><span
style="color:#7F7F7F;mso-fareast-language:DE">Prof. Dr.-Ing.
Lars Kühl<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#7F7F7F;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#7F7F7F;mso-fareast-language:DE">Salzdahlumer
Straße 46-48<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#7F7F7F;mso-fareast-language:DE">D - 38302
Wolfenbüttel<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#7F7F7F;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#7F7F7F;mso-fareast-language:DE"><a
moz-do-not-send="true" href="http://www.ostfalia.de/v"><span
style="color:blue"><a class="moz-txt-link-abbreviated" href="http://www.ostfalia.de/v">www.ostfalia.de/v</a></span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#7F7F7F;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#7F7F7F;mso-fareast-language:DE" lang="EN-US">Tel.
0049 - 5331 / 939 – 40 550<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#7F7F7F;mso-fareast-language:DE" lang="EN-US">Fax
0049 - 5331 / 939 – 40 552<o:p></o:p></span></p>
<p class="MsoNormal"><u><span
style="color:blue;mso-fareast-language:DE" lang="EN-US"><a
moz-do-not-send="true" href="mailto:y.wandy@ostfalia.de"><span
style="color:blue"><a class="moz-txt-link-abbreviated" href="mailto:y.wandy@ostfalia.de">y.wandy@ostfalia.de</a></span></a></span></u><span
style="color:#7F7F7F;mso-fareast-language:DE" lang="EN-US"><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"><o:p> </o:p></span></p>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
TRNSYS-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:TRNSYS-users@lists.onebuilding.org">TRNSYS-users@lists.onebuilding.org</a>
<a class="moz-txt-link-freetext" href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a>
</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
***************************
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
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.tess-inc.com">http://www.tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
</body>
</html>