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<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Additional information:
Type 619a is from the Co-Gen Library (TESS), author and editor is Jeff Thornton.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Martin<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Bei Fragen bitten wir um Ihren Rückruf.<br>
<br>
<br>
Mit freundlichen Grüßen<br>
<br>
BLS Energieplan GmbH<br>
i. A. Martin Thur<br>
</span></font><font size=1 color=gray face=Arial><span style='font-size:7.5pt;
font-family:Arial;color:gray'><br>
Elsenstraße 106<br>
D-12435 Berlin<br>
Tel.: +49 30 53 32 81-0<br>
Fax: +49 30 53 32 81-40<br>
____________________________________________________<br>
BLS Energieplan GmbH<br>
Sitz der Gesellschaft: Berlin<br>
Geschäftsführer: Christoph Lange, Wolfgang Sturm<br>
Registergericht: Amtsgericht Berlin-Charlottenburg, HRB-Nr. 32021 </span></font><o:p></o:p></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>Von:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Martin Thur
[mailto:Martin.Thur@BLS-Energieplan.de] <br>
<b><span style='font-weight:bold'>Gesendet:</span></b> Montag, 31. Mai 2010
16:30<br>
<b><span style='font-weight:bold'>An:</span></b> <st1:PersonName w:st="on">trnsys-users@cae.wisc.edu</st1:PersonName><br>
<b><span style='font-weight:bold'>Betreff:</span></b> [TRNSYS-users] Type 619a
- Wrong calculation?</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hello everyone,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>in my simulation i use type 619a (Open Feedwater
Heater - Steam Flow Calculated to Achieve User-Designated Outlet). When I click
on the more… button of output 6 (Heat Transfer Rate) it says:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>“The rate at which energy is added to the de-aerating
heater by the high-temperature steam inlet. The heat transfer rate is
calculated by multiplying the high-temperature steam flow rate by <i><span
style='font-style:italic'>the enthalpy difference between the high-temperature
steam and the entering low-temperature steam</span></i> (condensate).”<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>In my opinion this difference is wrong. I think the
high-temperature steam flow rate should be multiplied by <i><span
style='font-style:italic'>the enthalpy difference between the high-temperature
steam and mixed outlet steam, </span></i>because the high-temperature steam
flow can’t “cool down” below the mixing enthalpy. One
consequence is that output 5 (Required Source Steam Flow Rate) is always too
low (according to my test simulation + calculation).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>I am not 100 % sure about that so any thoughts on
that are well appreciated.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Kind regards<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Martin<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Bei Fragen bitten wir um Ihren Rückruf.<br>
<br>
<br>
Mit freundlichen Grüßen<br>
<br>
BLS Energieplan GmbH<br>
i. A. Martin Thur<br>
</span></font><font size=1 color=gray face=Arial><span style='font-size:7.5pt;
font-family:Arial;color:gray'><br>
Elsenstraße 106<br>
D-12435 Berlin<br>
Tel.: +49 30 53 32 81-0<br>
Fax: +49 30 53 32 81-40<br>
____________________________________________________<br>
BLS Energieplan GmbH<br>
Sitz der Gesellschaft: Berlin<br>
Geschäftsführer: Christoph Lange, Wolfgang Sturm<br>
Registergericht: Amtsgericht Berlin-Charlottenburg, HRB-Nr. 32021 </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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