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<DIV><FONT face=Arial size=2>Dear all,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I have followed your advice to increase the number
of online plotter in my simulation but I don't understand </FONT></DIV>
<DIV><FONT face=Arial size=2>this result:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>- during periods of high solar radiation and
for a high value of inlet flow rate, when the pump starts to
run</FONT></DIV>
<DIV><FONT face=Arial size=2>the outlet temperature immediately rises up to the
point of the maximum outlet temperature and then at once it </FONT></DIV>
<DIV><FONT face=Arial size=2>drops to a lower value, even if the beam solar
radiation is high ( I put the project and the weather file enclosed: see
the online plotter).</FONT></DIV>
<DIV><FONT face=Arial size=2>I have the same problem when the time is about 18 (
when the pump turn off). </FONT></DIV>
<DIV><FONT face=Arial size=2>I don't know if it's a problem of </FONT><FONT
face=Arial size=2>inlet flow rate's value ( too high :15000 kg/hr) - input-
or about the efficiency slope - parameter- </FONT></DIV>
<DIV><FONT face=Arial size=2>which I have </FONT><FONT face=Arial size=2>to
calculate considering another tested flow rate.</FONT></DIV>
<DIV><FONT face=Arial size=2>Is it possible that there are other causes about
this problem? Can anyone explain me this?</FONT></DIV>
<DIV><FONT face=Arial size=2> </FONT></DIV>
<DIV><FONT face=Arial size=2>Thanks in advance,</FONT></DIV>
<DIV><FONT face=Arial
size=2>
Samuele Mazzei.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><I have done a simple project in which an oil passed through a
linear<BR>parabolic concentrator:<BR>does anyone have a look to my project and
tell me if something is wrong?<BR>(I can't understand anything about the on line
plotter of the type 536's<BR>outlet temperature).><BR><BR>I looked at your
project and everything seems fine to me. I don't have<BR>the weather file
you used so I used another TMY-2 file but everything<BR>seems fine. When
the pump is running the outlet temperature approaches<BR>the inlet temperature
during periods of low solar radiation and exceeds<BR>the inlet temperature
during periods of high solar radiation - up to the<BR>point of the maximum
outlet temperature at which point the collector dumps<BR>energy to maintain the
outlet temperature. During periods when the pump<BR>is off, the outlet
temperature is near the ambient unless there is solar<BR>radiation at which time
the collector temperature rises above the ambient.<BR><BR>Did you see something
that causes you to have doubts about your results? <BR>You may want to increase
the number of online plots per simulation from 1<BR>per year to 1 per week in
order to see the outputs a bit better
though...<BR><BR>Jeff<BR></DIV></BODY></HTML>