<html>
<head>
<meta http-equiv=Content-Type content="text/html; charset=utf-8">
<meta name=Generator content="Microsoft Word 11 (filtered)">
<style>
<!--
/* Font Definitions */
@font-face
{font-family:"MS Mincho";
panose-1:2 2 6 9 4 2 5 8 3 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:"\@MS Mincho";
panose-1:2 2 6 9 4 2 5 8 3 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{color:purple;
text-decoration:underline;}
p
{margin-right:0cm;
margin-left:0cm;
font-size:12.0pt;
font-family:"Times New Roman";}
span.EmailStyle18
{font-family:Arial;
color:navy;}
@page Section1
{size:595.3pt 841.9pt;
margin:72.0pt 90.0pt 72.0pt 90.0pt;}
div.Section1
{page:Section1;}
-->
</style>
</head>
<body lang=EN-US link=blue vlink=purple>
<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi Bernd,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>maybe I could help a little bit (although
I am not quite sure what you mean with “variable controller” vs. “constant mass
flow” as the mass flow would be controlled), but please first state your
affiliation.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards,</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Achim</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<div>
<p style='margin:0cm;margin-bottom:.0001pt'><font size=2 face=Arial><span
lang=DE-CH style='font-size:10.0pt;font-family:Arial'> </span></font></p>
</div>
<div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
esp-r-bounces@lists.strath.ac.uk [mailto:esp-r-bounces@lists.strath.ac.uk] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Bernd B.<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, August 21, 2008
10:05 AM<br>
<b><span style='font-weight:bold'>To:</span></b> esp-r@lists.strath.ac.uk<br>
<b><span style='font-weight:bold'>Subject:</span></b> [esp-r] Control of a
plant component</span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0>
<tr>
<td valign=top style='padding:0cm 0cm 0cm 0cm'>
<div id=yiv1351771462>
<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Dear all, <br>
<br>
I have a question concerning the control of a plant component: <br>
I would like to control the mass flow of a pump (type 15, variable speed
domestic WCH pump) according to a temperature difference between two plant
components. <br>
I know how to do that with a constant mass flow of the pump. However I want
to use variable mass flow. Somehow I cannot combine a *variable
controller* with the <span class=moz-txt-tag><b><span style='font-weight:
bold'>*</span></b></span><b><span style='font-weight:bold'>controller type
"temperature difference<span class=moz-txt-tag>*</span></span></b>"!
<br>
In my view it's not possible to do that with a usual control function. Does
anyone know how to get that done? <br>
<br>
Thanks! <br>
Best regards <br>
Bernd </span></font></p>
</div>
</td>
</tr>
</table>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
__________________________________________________<br>
Do You Yahoo!?<br>
Sie sind Spam leid? Yahoo! Mail verfügt über einen herausragenden Schutz gegen
Massenmails. <br>
http://mail.yahoo..com </span></font></p>
</div>
</div>
</body>
</html>