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I am rethinking my interpretation of the REFG-ZONE-LOAD - I know believe
the manual means "the load on the case work due to heat gain from
the adjacent space" - the larger ( larger in the negative direction
) the zone load, the move compressor is used. The reciprocal, heat
loss in the space due to the coolness "spilling out of the
cases" is not taken into account by the program. Therefore the
larger the negative number, the more there is "heat" in the
space and the higher the unmet cooling hours. Just a guess but if
you fix the REFG-ZONE-LOAD and change the space temperature you achieve
the same effect - lower the space heating temperature set point, the
lower the unmet cooling hours. If that is the case, then I suspect
that the space somehow sees the zone load as increase in heat in the
space?<br><br>
This would indicate that there are other REFG keywords that might
influence the heat gain to the space due to the compressor working harder
when REFG-ZONE-LOAD is larger. <br><br>
<br><br>
At 10:33 AM 06/08/2012, Yoni Pollak wrote:<br>
<blockquote type=cite class=cite cite="">Chris,<br>
<br>
You might be right about that heat ending up in the space, but that
doesn’t sound right to me. I was getting an error when REFG-AUK-KW
was 0, so I reset it. I’ve actually played around with that number
quite a bit since it seems to have a large impact on the energy
consumption. I’ll revisit it again this morning. <br>
<br>
I’m talking aboiut umnet cooling load hours. The REFG-ZONE-LOAD
keyword seems to be directly related to my space loads but in the
opposite way I thought. The more REFG-ZONE-LOAD, the more system
cooling the space requires. <br>
<br>
<br>
<br>
Yoni G. Pollak, PE<br>
(T) 770-622-2270<br>
<br>
<b>From:</b> Chris Jones
[<a href="mailto:cj@enersave.ca" eudora="autourl">
mailto:cj@enersave.ca</a>] <br>
<b>Sent:</b> Saturday, August 04, 2012 12:15 PM<br>
<b>To:</b> ypollak@gtp-eng.com; equest-users@lists.onebuilding.org<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Refrigeration Modeling (2) - Zone
Load<br>
<br>
There are a number of other REFG- keywords that depend on
REFG-ZONE-LOAD. For example:<br>
REFG-AUK-KW - takes three entries (order corresponds to REFG-ZONE-LOAD)
of the fractional rated capacity of lights, fans, anti-sweat heaters -
the default is 40% of the REFG-ZONE-LOAD - I am not entirely sure but I
believe this heat ends up in the space. <br><br>
Also, do you mean the unmet load hours are cooling load unmet or heating
load unmet?<br>
<br><br>
<br>
At 10:21 AM 03/08/2012, Yoni Pollak wrote:<br><br>
Content-Type: multipart/alternative;<br>
boundary="----=_NextPart_000_0096_01CD7161.C28847D0"<br>
Content-Language: en-us<br><br>
Hi All,<br>
<br>
Has anyone had experience modeling refrigeration cases? I posted a
question the other day but this one is different.<br>
<br>
So under Air-Side HVAC Zone Parameters > Refrigeration Tab, Zone Load
(REFG-ZONE-LOAD) I entered the free cooling affect from the refrigeration
cases to the space (as described in the key word help). But looking
at the SIM file, this parameter is increasing my zone loads rather than
decreasing them, and in fact is causing my space to have more unmet load
hours. Should I apply a negative number to this parameter, or is
this parameter not the ‘free cooling’ affect. <br>
<br>
<br>
That along with the Walkin Box Load under the Air-Side HVAC System
Parameter. Not sure how the program is using this value.<br>
<br>
Thanks!<br>
<br>
<br>
<b> <br>
<br>
Yoni G. Pollak, P.E.<br>
</b>Mechanical Engineer<br>
<br>
<b>GTP Consulting Engineers, Inc<br>
</b><i>4197 Pleasant Hill Rd <br>
Suite 200<br>
Duluth, GA 30096<br>
(770) 622-2270<br>
</i><a href="mailto:ypollak@gtp-eng.com">ypollak@gtp-eng.com</a><br>
<b> <br>
<br>
<br>
</b> <br>
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Christopher Jones, P.Eng.<br>
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Fax. 416-946-1005<br>
email <a href="mailto:cj@enersave.ca">cj@enersave.ca</a></blockquote>
<x-sigsep><p></x-sigsep>
>><br>
Christopher Jones, P.Eng.<br>
Suite 1801, 1 Yonge Street<br>
Toronto, ON M5E1W7<br>
Tel. 416-203-7465<br>
Fax. 416-946-1005<br>
email cj@enersave.ca<br>
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