<div dir="ltr">The other thing that could be going on is that a drop in SHGC is driving up heating loads. That could definitely happen in mild, heating-focused areas, but does not seem to fit with your case. Are you changing the system sizing to account for the reduced load or leaving sizing fixed? Do you have reheat going up because you are pumping too much cold air? <div><br></div><div>My number one thing when you're seeing something funny is to get into the hourly output and compare the two cases. Which end uses are going up? Where? When? Are space temperatures staying in range when they are supposed to be? Do you have heating and cooling fighting each other? </div><div><br></div><div>You might have something else in your model that's messed up that will be apparent when you look at the hourly output. Plus, there's nothing more fun in simulation than looking at hourly output, IMHO. </div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Nov 3, 2017 at 2:42 PM, Joe Huang via Bldg-sim <span dir="ltr"><<a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<p>From my experience, such kinds of counter-intuitive results,
e.g., cooling energies going up with lower U-values, are due to
overlooked systems/loads interactions rather than arcane loads
considerations such as spectral properties of window glazings. <br>
</p>
<p>The three interactions that I would look are:</p>
<p>(1) does the system have an economizer that vents the cooling
loads when the indoor temperature or enthalpy exceed that outdoor
?</p>
<p>(2) is the system sizing the same for both runs? If not, fix the
system size to the larger from the two autosized runs.</p>
<p>(3) (this gets rather arcane but explained the anomaly for
increased heating in mild cooling climates like the Pacific
Northwest) change Cooling Control from CONSTANT to WARMEST, i.e.,
control cooling control for the warmest zone rather than all
zones.<br>
</p>
<p>Joe<br>
</p>
<pre class="m_3934894181492237600moz-signature" cols="72">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
<a class="m_3934894181492237600moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com" target="_blank">yjhuang@whiteboxtechnologies.<wbr>com</a>
<a class="m_3934894181492237600moz-txt-link-freetext" href="http://weather.whiteboxtechnologies.com" target="_blank">http://weather.<wbr>whiteboxtechnologies.com</a> for simulation-ready weather data
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</pre><div><div class="h5">
<div class="m_3934894181492237600moz-cite-prefix">On 11/3/2017 7:15 AM, Javed Iqbal via
Bldg-sim wrote:<br>
</div>
<blockquote type="cite">
<div dir="auto">In my past experiences, such problems were
resolved by using detailed spectral properties (LBNL window
output) in eQuest for an Indian composite climate case.
<div dir="auto">
<div dir="auto"> </div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
<div data-smartmail="gmail_signature" dir="auto">Sent from
mobile, pls excuse typos</div>
</div>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Nov 3, 2017 2:47 PM, "akshay gupta"
<<a href="mailto:akshaykg@gmail.com" target="_blank">akshaykg@gmail.com</a>> wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hi Javed
<div><br>
</div>
<div>Thanks for helping. We were actually modelling using
simplified glass inputs. But I can try with detailed
glass model as well.</div>
<div><br>
</div>
<div>Regards</div>
<div> </div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On 3 November 2017 at 18:51,
Javed Iqbal <span dir="ltr"><<a href="mailto:javedvit@gmail.com" target="_blank">javedvit@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="auto">Thank you, Mr. Jim.
<div dir="auto"><br>
</div>
<div dir="auto">Apart from internal loads, it's
worth looking into window spectral properties.
Sometime simple inputs like U value, SHGC and Tvis
is not enough and recommended to use whole
assembly window properties generated through LBNL
window software which could be imported directly
into the eQuest.</div>
<div dir="auto"><br>
</div>
<div dir="auto">It might help!!</div>
<div dir="auto"><br>
</div>
<div dir="auto">Regards,<br>
<br>
<div data-smartmail="gmail_signature" dir="auto">Sent
from mobile, pls excuse typos</div>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">
<div>
<div class="m_3934894181492237600m_-1960156932950890873h5">On Nov 3,
2017 1:37 PM, "akshay gupta via Bldg-sim" <<a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.or<wbr>g</a>>
wrote:<br type="attribution">
</div>
</div>
<blockquote class="m_3934894181492237600m_-1960156932950890873m_-9026500415791253507quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div class="m_3934894181492237600m_-1960156932950890873h5">
<div dir="ltr">Hi There
<div><br>
</div>
<div>I am facing an issue in eQuest in
almost all simulation models for most
hot and composite indian climates.
Whenever we reduce U-value of glass in
model, from Single Glazing U-Value of 1
Btu/hr Sqft F to 0.32 Btu/hr Sqft F (or
any other U-value lower than 1), we see
an increase in energy consumption.</div>
<div><br>
</div>
<div>Can someone point out principal
mistake that may be making in the model.</div>
<div><br>
</div>
<div>Thanks in advance.</div>
<div><br>
</div>
<div>Regards</div>
<font color="#888888">
<div><br>
</div>
<div>Akshay Gupta </div>
</font></div>
<br>
</div>
</div>
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