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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'>Could you use an equation instead of
changing the fortran code? Something like (CW greater than 24C) </span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>AND</span></font><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> (HW less than 85) </span></font><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>AND</span></font><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'> (Tset less than 7) THEN (control
signal = 0)? Equations are useful for quick fixes if you don’t want to recompile
the fortran type. </span></font></p>
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<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> Jeremy Osborne
[mailto:j.osborne@student.unsw.edu.au] <br>
<b><span style='font-weight:bold'>Sent:</span></b> February 8, 2010 7:08 AM<br>
<b><span style='font-weight:bold'>To:</span></b> </span></font><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>trnsys-users@cae.wisc.edu</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>;
techsupport@tess-inc.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> [TRNSYS-users] dynamic
data invalid data points</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-right:0cm;margin-bottom:12.0pt;margin-left:
36.0pt'><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>Dear
All, <br>
<br>
I am modeling a BROAD single effect absorption chiller using type680. This uses
the catalog data lookup approach. Not all data points are available for all
operation conditions, for example, with cooling water (CW) in of 30C, Set point
Temp 7C, and hot water (HW) input of 85C there is no capacity data point
because it is below 50%, however there is a data point available at CW of 24C,
set point temp of 7C and HW input of 85C so we need to have the 85C included in
the data file. <br>
<br>
The problem is what to put as the data point in these invalid points? <br>
Zero (0) works for most, as it just turns the chiller off, but a problem
occurs when the conditions are between an invalid and a valid data point
because the dynamic data point interpolates between the 0 and the real value
leading to unrealistic data. <br>
<br>
There needs to be a way to switch the chiller off when an any invalid data
point is used. <br>
<br>
One solution is to add another 0, Zero point very close to each side of the
point, for example(not exact), do 85, 89.9, 90..... = capacity 0, 0,
0.74.....<br>
<br>
This would minimize the interpolation chance, however not great and pointful to
create the data file. <br>
<br>
Another solution would be to put NA or something in the data file for the
invalid points, and change the fortran code to recognize this and switch the
chiller off. Similar to the errorif function in Excel. <br>
However my fortran is very limited and i couldn't find anything on the web. <br>
<br>
Has anyone found a better solution or can help with this? <br>
<br>
Kind regards,<br>
<br>
Jeremy<br>
<br>
<br>
<br>
</span></font></p>
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