Eohini,<div><br></div><div>I only create custom curves when I need to, like when a new system's performance isn't remotely like the default system's performance. Using PVVT to model VRF comes to mind. In that case, I specify every variable I can and review every default with utmost care.</div>
<div><br></div><div>In the case of DX systems, though, unless you are trying to model some new, fancy-dancy model, use the existing curves. They would have been updated in 3-64 so they are pretty new and so should reflect the performance of the current on market equipment pretty well.</div>
<div><br></div><div>Save your custom curves for your complicated stuff. VFD Chillers, etc.</div><div><br></div><div>Best.,</div><div><br></div><div>Carol<br><br><div class="gmail_quote">On Fri, May 27, 2011 at 7:33 AM, Haddad, Kamel <span dir="ltr"><<a href="mailto:Kamel.Haddad@nrcan-rncan.gc.ca">Kamel.Haddad@nrcan-rncan.gc.ca</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div>
<div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial">Rohini, I would suggest that total coil capacity and sensible
capacity and the COP as function of part load are the most important of all.
Once these are known the exit conditions from the coil for given inlet
conditions can be determined. Usually you need either the sensible capacity
(with the total capacity) or the bypass factor to determine the exit conditions.
So I am not sure at this point why eQuest needs information for
both.</font></span></div>
<div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial"></font></span> </div><font color="#888888">
<div dir="ltr" align="left"><span><font color="#0000ff" size="2" face="Arial">Kamel Haddad.</font></span></div>
<div>
<hr>
<font size="2" face="Tahoma"><b>From:</b> <a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>
[mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>R
B<br><b>Sent:</b> May 26, 2011 14:12<br><b>To:</b> eQUEST Users
List<br><b>Subject:</b> [Equest-users] Second try - how many DX curves to
customize?<br></font><br></div></font><div><div></div><div class="h5">
<div></div>
<div>Did not get any replies for this - maybe Thursday is my lucky day and
someone has the answer:</div>
<div> </div>
<div>There are two performance curves and five curves under capacity curves tab
for DX cooling. I was planning on generating just custom performance curves, but
was wondering if it is necessary to generate custom capacity curves also? If
yes, which of the capacity curves are critical to be customized (total cap vs
temps, sen cap vs temps, bypass factor vs temps, bypass factor vs flow, and
bypass factor vs part load). My thinking is total cap and sensible cap curves
might be useful to customize. Is it easy to get data for the bypass factor
curves?</div>
<div> </div>
<div>Appreciate it if anyone who has done custom curves for DX cooling can chime
in.</div>
<div> </div>
<div>Thanks</div>
<div>-Rohini</div></div></div></div>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Carol Gardner PE<br>
</div>