<html><head></head><body><div class="ydpe25fd759yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div><div dir="ltr" data-setdir="false">Bill, David, Jeff and Nick:</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Thank you for the responses.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I am using 3.65 Build 7175. I am not using the refrigeration mode, as far as I know. The only two modes shown under Select Version are 2.2 and 2.3. I am using 2.3. Doesn't the refrigeration version have an R after the DOE version?<br></div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I am not using a waterside economizer. I have 2 air handlers per building. One feeds the north all three floors and one feeds the south all three floors. They are VAV units with a chilled water loop and an electric reheat coil for each building. Each building has 2 chillers for the loop and one pump. The VAV boxes do not have reheat capability.<br></div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Perhaps the oddest thing is that this project is in Saudi Arabia and I am using the TMY2/RIYADH83.bin weather file.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">The error message I am getting is:</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><div>***ERROR***********************************************************************<br>Heat-Exchanger: EA Sys1 A-1 (VAVS) (G) UA calculation<br>failed to converge.</div><div><br></div><div dir="ltr" data-setdir="false">The EA Sys A-1 in the above error message changes. Sometimes I increase the number of ACH/Hr for a few zones in building A and I get an error message for EB System B-2 (building B) or EC System C1 (Building C). Can't make rhyme or reason of connection. <br></div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Many thanks,<br></div></div><div><br></div><div class="ydpe25fd759signature">Paul Diglio<br>87 Fairmont Avenue <br>New Haven, CT 06513 <br><br>203-415-0082</div></div>
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On Monday, December 9, 2019, 5:27:53 PM EST, Jeff Hirsch <james.j.hirsch@gmail.com> wrote:
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<div>That message seems to indicate you are using the refrigeration version
(2.2R) ... for a conventional building model you should use 2.3 or 2.2 not 2.2R
... in the refrigeration version coils use a heat exchanger model, so you
probably have many heat exchangers. But, again, perhaps you should be using
2.3.</div>
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<span style="FONT-FAMILY:calibri;FONT-WEIGHT:bold;"></span><span style="FONT-FAMILY:calibri;FONT-WEIGHT:bold;">Jeff Hirsch</span><br style="FONT-FAMILY:calibri;" clear="none"><span style="FONT-FAMILY:calibri;"></span><span style="FONT-FAMILY:calibri;">James J. Hirsch & Associates<br clear="none"></span><span style="FONT-FAMILY:calibri;">voice mail: (805) 553-9000<br clear="none"></span><span style="FONT-FAMILY:calibri;">mobile: (805) 532-1045<br clear="none"></span><span style="FONT-FAMILY:calibri;"></span><br style="FONT-FAMILY:calibri;" clear="none"><span style="FONT-FAMILY:calibri;"></span><span style="FONT-FAMILY:calibri;"></span><br style="FONT-FAMILY:calibri;" clear="none"><span style="FONT-FAMILY:calibri;"></span><span style="FONT-FAMILY:calibri;"></span></div>
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<div><b>From:</b> <a shape="rect" title="equest-users@lists.onebuilding.org">Paul Diglio via Equest-users</a> </div>
<div><b>Sent:</b> Monday, December 9, 2019 3:13 AM</div>
<div><b>To:</b> <a shape="rect" title="equest-users@lists.onebuilding.org">Equest-users</a>
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<div><b>Subject:</b> [Equest-users] UA Convergence Error</div></div></div></div>
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<div dir="ltr">Hi Folks:</div>
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<div dir="ltr">I am getting a "heat exchanger XX Sys1 UA
calculation failed to converge" error. The model has three building in it
and only two air handlers per building. I don't have any heat exchangers
attached to the air handlers or any heat recovery installed.<br clear="none"></div>
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<div dir="ltr">Sometimes the error occurs when I change the
glass type via the library and other times I get the error when I adjust the air
changes per hour in one or two zones.</div>
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<div dir="ltr">In the example above, the error was for system
B2, but it varies...sometimes systems A or C 1 or 2.</div>
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<div dir="ltr">Any ideas what the problem could be?
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<div dir="ltr">Thank you,<br clear="none"></div>
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<div class="ydpe55cb905yiv2650131998ydpc71e246csignature">Paul Diglio<br clear="none">87 Fairmont Avenue <br clear="none">New Haven,
CT 06513 <br clear="none"><br clear="none"><br clear="none"></div></div></div>
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