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<p>I think this is a case of DOE-2 still using an older procedure
for the solar portion of the design day calculation. Prior to
2006, ASHRAE used a relatively crude ASHRAE Clear Sky Model to
determine the hourly profile of solar radiation for the design
day. That model assumes there are different sky conditions for
different latitudes, etc. In 2006, ASHRAE TC 4.2 (Climatic
Information) carried out a project to develop an entirely new
ASHRAE Clear Sky Model that's a parameterization of a detailed
solar model developed by Chris Gueymard. <br>
</p>
<p>It would be nice if DOE-2 incorporates the new ASHRAE Clear Sky
Model, which isn't terribly hard, but would take work. Besides,
I'm under the impression that the vast majority of DOE-2 users
don't do design day calculations but rather let the program
autosize the equipment anyway!</p>
<p>Joe<br>
</p>
<pre class="moz-signature" cols="90">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
<a class="moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a>
<a class="moz-txt-link-freetext" href="http://weather.whiteboxtechnologies.com">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
</pre>
<div class="moz-cite-prefix">On 11/29/2016 9:43 AM, Nicholas Caton
via Equest-users wrote:<br>
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<div class="WordSection1">
<p class="MsoNormal">I have a question concerning doe2/eQUEST
DESIGN-DAYs.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">One of the keywords for DESIGN-DAY confuses
me: CLIMATE. I have not been able to find this documented in
the current doe2 reference manual or 2.1A engineering
manuals.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">It appears the CLIMATE keyword can accept
one of three inputs: “SUBARCTIC,” “MIDLATITUDE,” or
“TROPICAL.” The default is MIDLATITUDE and does not appear to
reference anything else.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><img style="width:5.9062in;height:4.8229in"
id="_x0000_i1027"
src="cid:part1.92F4CFEF.2EC0352E@whiteboxtechnologies.com"
height="463" width="567"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So I have a few questions:<o:p></o:p></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
style="mso-list:Ignore">1.<span style="font:7.0pt
"Times New Roman"">
</span></span><!--[endif]-->What is this input used for?
Does it help to determine solar angles during design day
calculations? Does it affect how other DESIGN-DAY inputs are
interpreted?<o:p></o:p></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
style="mso-list:Ignore">2.<span style="font:7.0pt
"Times New Roman"">
</span></span><!--[endif]-->Since one of the options is
named “MIDLATITUDE,” my best guess is this is trying to
establish in a loose sense which slice of the globe the
weather station is located at for solar angle purposes. From
that guess,
<a moz-do-not-send="true"
href="http://www.lat34north.com/cities/CitiesLatitude.cfm">I
googled the topic for a bit</a> and came up with this
framework:<o:p></o:p></p>
<p class="MsoListParagraph"
style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2
lfo2">
<!--[if !supportLists]--><span style="mso-list:Ignore">a.<span
style="font:7.0pt "Times New Roman"">
</span></span><!--[endif]-->SUBARCTIC latitudes are >
66.5 or < -66.5 (Inside the Arctic circles – experiences
days of complete daylight/darkness)<o:p></o:p></p>
<p class="MsoListParagraph"
style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2
lfo2">
<!--[if !supportLists]--><span style="mso-list:Ignore">b.<span
style="font:7.0pt "Times New Roman"">
</span></span><!--[endif]-->TROPICAL is between -23.5 and
23.5 (Tropic of Capricorn/Cancer – experiences the sun
traversing directly overhead)<o:p></o:p></p>
<p class="MsoListParagraph"
style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2
lfo2">
<!--[if !supportLists]--><span style="mso-list:Ignore">c.<span
style="font:7.0pt "Times New Roman"">
</span></span><!--[endif]-->MIDLATITUDE = everywhere else<o:p></o:p></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
style="mso-list:Ignore">3.<span style="font:7.0pt
"Times New Roman"">
</span></span><!--[endif]-->I struggle however with the
concept of a DESIGN-DAY input based on latitude, where<o:p></o:p></p>
<p class="MsoListParagraph"
style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2
lfo2">
<!--[if !supportLists]--><span style="mso-list:Ignore">a.<span
style="font:7.0pt "Times New Roman"">
</span></span><!--[endif]-->The latitude is already a part
of the weather file required for every simulation… and pulling
the exact latitude would be more accurate anyway (I confess
here I have never studied solar pathing in great depth – the
problem may be simpler than I realize?).<o:p></o:p></p>
<p class="MsoListParagraph"
style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2
lfo2">
<!--[if !supportLists]--><span style="mso-list:Ignore">b.<span
style="font:7.0pt "Times New Roman"">
</span></span><!--[endif]-->These bands alone don’t give you
enough information to know when you’re in the lower hemisphere
(where solar angles based on the day/month would be flipped)<o:p></o:p></p>
<p class="MsoListParagraph"
style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2
lfo2">
<!--[if !supportLists]--><span style="mso-list:Ignore">c.<span
style="font:7.0pt "Times New Roman"">
</span></span><!--[endif]-->This leads me to question
whether there’s a (meaningful) difference in solar angles
experienced for loads calculations when you use the weather
file instead of DESIGN-DAY inputs.
<o:p></o:p></p>
<p class="MsoListParagraph"
style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2
lfo2">
<!--[if !supportLists]--><span style="mso-list:Ignore">d.<span
style="font:7.0pt "Times New Roman"">
</span></span><!--[endif]-->Alternatively, maybe the
latitude IS pulled from the weather file for solar angle
purposes so I’m completely on the wrong path as to the
purpose/intent for the CLIMATE input.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Can anyone set me straight on this topic?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">~Nick<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-family:"Arial",sans-serif;color:#3A7A46"><img
style="width:7.5208in;height:.0937in" id="Picture_x0020_1"
src="cid:part3.398EBD97.51D46A49@whiteboxtechnologies.com"
height="9" border="0" width="722"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span
style="font-family:"Arial",sans-serif;color:#3A7A46">Nick
Caton, P.E., BEMP</span></b><span style="color:#3A7A46"><o:p></o:p></span></p>
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<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">
Senior Energy Engineer</span><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span
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Energy and Sustainability Services</span><span
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</span><span
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Schneider Electric</span><span style="color:#1F497D"><o:p></o:p></span></p>
</td>
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valign="top" width="291">
<p class="MsoNormal"><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">D </span><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">913.564.6361
</span><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">M </span><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">785.410.3317
</span><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
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style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">E </span><span
style="color:#1F497D"><a moz-do-not-send="true"
href="mailto:nicholas.caton@schneider-electric.com"><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">nicholas.caton@schneider-electric.com</span></a></span><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">F </span><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">913.564.6380</span><span
style="color:#1F497D"><o:p></o:p></span></p>
</td>
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valign="top" width="203">
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align="right"><span
style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">15200
Santa Fe Trail Drive<br>
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