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So does that mean, for an all air system, off-coil temperature is
actually lower in cooling and higher in heating for the startup period?<br>
Chris<br>
<br>
On 24/06/2010 12:16, Seth P. Spangler wrote:
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Arial","sans-serif"; color: rgb(0, 112, 192);">Vinay,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Arial","sans-serif"; color: rgb(0, 112, 192);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Arial","sans-serif"; color: rgb(0, 112, 192);">You
are to increase the cooling/heating coil capacities as
required by ASHRAE Appendix G. However, the over sizing is for coil
capacity
only – the airflow rate should be sized at 100% of what your energy
modeling
program calculates as being required to meet the space load.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Arial","sans-serif"; color: rgb(0, 112, 192);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Arial","sans-serif"; color: rgb(0, 112, 192);">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Arial","sans-serif"; color: rgb(0, 112, 192);"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Georgia","serif"; color: rgb(0, 112, 192);">Seth
Spangler, LEED® AP <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family: "Georgia","serif"; color: rgb(0, 112, 192);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Georgia","serif"; color: rgb(0, 112, 192);">RMF
Engineering, Inc <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Georgia","serif"; color: rgb(0, 112, 192);">Ph:
(843) 971-9639 ext:1497</span><span style="color: rgb(0, 112, 192);"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Georgia","serif"; color: rgb(0, 112, 192);">Fax:
(843) 971-9641 <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Georgia","serif"; color: rgb(0, 112, 192);"><a class="moz-txt-link-abbreviated" href="mailto:sspangle@rmf.com">sspangle@rmf.com</a></span><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(0, 112, 192);"><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Arial","sans-serif"; color: rgb(0, 112, 192);"><o:p> </o:p></span></p>
<div>
<div
style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";">
<a class="moz-txt-link-abbreviated" href="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a>
[<a class="moz-txt-link-freetext" href="mailto:bldg-sim-bounces@lists.onebuilding.org">mailto:bldg-sim-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>James
V
Dirkes II, PE<br>
<b>Sent:</b> Wednesday, June 23, 2010 7:16 PM<br>
<b>To:</b> 'Vinay Devanathan'; <a class="moz-txt-link-abbreviated" href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Bldg-sim] sizing for baseline case acc to App. G<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Dear
Vinay,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">I’m
not sure of the rationale for the ASHRAE 90.1
oversizing requirements, however here are my thoughts:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent: -0.25in;"><!--[if !supportLists]--><span
style="font-size: 11pt; font-family: Symbol; color: rgb(31, 73, 125);"><span
style="">·<span
style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">
</span></span></span><!--[endif]--><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">I
think the principal engineering rationale for oversizing is to
allow a building to reach its setpoint temperature quickly after a
period of
inactivity. As an example, if a building is inactive during a holiday
and
the temperature is allowed to float several degrees lower (in winter),
the
additional 25% heating capacity will enable faster return to the normal
setpoint temperature. Steam heating systems can need even more
capacity
for proper warmup capacity.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent: -0.25in;"><!--[if !supportLists]--><span
style="font-size: 11pt; font-family: Symbol; color: rgb(31, 73, 125);"><span
style="">·<span
style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">
</span></span></span><!--[endif]--><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Oversizing
is also a common practice as a “safety
factor”. Most load calculation software even has a separate input
for adding this “safety factor”. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-align: center;" align="center"><b><span
style="font-size: 13.5pt; color: rgb(31, 73, 125);">The Building
Performance Team<br>
</span><span style="color: rgb(31, 73, 125);">James V. Dirkes II,
P.E., LEED AP<br>
</span></b><span style="color: rgb(31, 73, 125);">1631 Acacia Drive NW<br>
Grand Rapids, MI 49504<br>
616 450 8653<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<div
style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal" style="margin-left: 0.5in;"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";">
<a class="moz-txt-link-abbreviated" href="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a>
[<a class="moz-txt-link-freetext" href="mailto:bldg-sim-bounces@lists.onebuilding.org">mailto:bldg-sim-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Vinay
Devanathan<br>
<b>Sent:</b> Wednesday, June 23, 2010 10:00 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> [Bldg-sim] sizing for baseline case acc to App. G<o:p></o:p></span></p>
</div>
<p class="MsoNormal" style="margin-left: 0.5in;"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left: 0.5in;">Hello All,<br>
<br>
Just to clarify a point - <br>
<br>
What does the oversizing of capacities by 15% for cooling and 25% for
heating
exactly mean? Do we only size the cooling and heating capacity or also
increase
the airflow rate corresponding to the oversizing?<br>
<br>
Thank you.<o:p></o:p></p>
</div>
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