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This is how I replied to the very same review comment about heat
pump operating temps, and elect strip heat.<br>
<br>
<img src="cid:part1.09060202.05040500@mfia-eng.com" alt=""><br>
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<p class="MsoNormal"><span
style="font-size:12.0pt;line-height:115%;font-family:
LiberationSans;mso-bidi-font-family:LiberationSans">This screen
capture shows
the efficiencies of the PTHPs used for the baseline. The
Unloading curves show
that the system is designed to calculate efficiencies and
capacities as outdoor
temperatures vary.<o:p></o:p></span></p>
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src="cid:part2.05020506.02000100@mfia-eng.com"
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font-family:LiberationSans;mso-bidi-font-family:LiberationSans;color:#444444"><o:p></o:p></span></p>
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12.0pt;font-family:LiberationSans;mso-bidi-font-family:LiberationSans;
color:#444444">This screen capture shows that the PTHPs will
operate down to 17
degrees F, and the electric strip heat is the second stage of
heating if the
compressor cannot keep up.<span style="mso-spacerun:yes"> </span><o:p></o:p></span></p>
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src="cid:part3.07030506.09030708@mfia-eng.com"
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font-family:LiberationSans;mso-bidi-font-family:LiberationSans;color:#444444"><o:p></o:p></span></p>
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style="font-size:
12.0pt;font-family:LiberationSans;mso-bidi-font-family:LiberationSans;
color:#444444">The secondary capacity curve prevents the strip
heat from being
activated when the outdoor temp is above 40 F.<o:p></o:p></span></p>
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<div class="moz-cite-prefix">On 8/20/2013 1:11 PM,
<a class="moz-txt-link-abbreviated" href="mailto:trace-users-request@lists.onebuilding.org">trace-users-request@lists.onebuilding.org</a> wrote:<br>
</div>
<blockquote
cite="mid:mailman.1.1377029517.41440.trace-users-onebuilding.org@lists.onebuilding.org"
type="cite">
<pre wrap="">Send Trace-users mailing list submissions to
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or, via email, send a message with subject or body 'help' to
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When replying, please edit your Subject line so it is more specific
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Today's Topics:
1. Heat Pump Cut Off (UNCLASSIFIED) (Eurek, John S NWO)
----------------------------------------------------------------------
Message: 1
Date: Tue, 20 Aug 2013 16:56:19 +0000
From: "Eurek, John S NWO" <a class="moz-txt-link-rfc2396E" href="mailto:John.S.Eurek@usace.army.mil"><John.S.Eurek@usace.army.mil></a>
To: <a class="moz-txt-link-rfc2396E" href="mailto:trace-users@lists.onebuilding.org">"trace-users@lists.onebuilding.org"</a>
<a class="moz-txt-link-rfc2396E" href="mailto:trace-users@lists.onebuilding.org"><trace-users@lists.onebuilding.org></a>
Subject: [Trace-users] Heat Pump Cut Off (UNCLASSIFIED)
Message-ID:
<a class="moz-txt-link-rfc2396E" href="mailto:E777FD5A41D3B04A83296213737A85D7070018D9@EIS-MB05WPC.eis.ds.usace.army.mil"><E777FD5A41D3B04A83296213737A85D7070018D9@EIS-MB05WPC.eis.ds.usace.army.mil></a>
Content-Type: text/plain; charset="us-ascii"
Classification: UNCLASSIFIED
Caveats: NONE
How do you have the Heat Pumps use electric heat below 40 degrees and cut off the compressor entirely below 17 degrees?
-Here is the insightful comment from the leed reviewing oracle.
Additionally, ensure that the Baseline heat pumps are modeled according to Section G3.1.3.1, which requires that the electric air?source heat pumps are modeled with electric auxiliary heat that only energizes on the last thermostat stage and when the outdoor air temperature is less than 40 degrees F. This means that the heat pump and auxiliary heat should operate together at low temperature conditions, with the compressor as the lead machine. The outside air cutoff temperature for the compressor must be no greater than the temperature associated with the low-temperature heating efficiency requirements of Table 6.8.1B (17 degrees F).
Classification: UNCLASSIFIED
Caveats: NONE
------------------------------
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End of Trace-users Digest, Vol 57, Issue 1
******************************************
</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Mark Denyer P.E. LEED™ AP BD&C
Principal
MFIA, Inc. Consulting Engineers
2007 SE Ash St.
Portland, Oregon 97214
(503) 234-0548
<a class="moz-txt-link-abbreviated" href="mailto:mark.denyer@mfia-eng.com">mark.denyer@mfia-eng.com</a>
<a class="moz-txt-link-abbreviated" href="http://www.mfia-eng.com">www.mfia-eng.com</a>
</pre>
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