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Mansi,<br>
<br>
If CoolT is as Vikram describes, this might be the solution to your
problem. The main issue for you is to know the air flow output of
the PDEC in actual operations, not under design conditions, so that
other program you mentioned for sizing the PDEC is of little help.
If CoolT is not able to give you air flow rates based on the ambient
conditions and the indoor air temperature, you could try building a
simple two-zone model (PDEC, Building) using CONTAM and then run
that stand-alone to get the air flows between the two zones. <br>
<br>
In reference to Vikram's comment, I've said all along that the
difference between the PDEC and a standard DEC<br>
is the mechanism used to drive the air across the media - using
natural bouyancy forces in the first case and a mechanical fan in
the second case. Once you have the air flow rate, the PDEC is
actually simpler to model because there's no need to model fan
efficiency and heat gain, etc. In fact, it just takes a single
effectiveness curve, or even just a constant effectiveness number.<br>
<br>
Joe<br>
<pre class="moz-signature" cols="90">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
<a class="moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a>
<a class="moz-txt-link-abbreviated" href="http://www.whiteboxtechnologies.com">www.whiteboxtechnologies.com</a>
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
</pre>
<br>
On 3/8/2012 6:49 AM, Mansi Jayswal wrote:
<blockquote
cite="mid:CABbd7ZZDH0e81wa4Z1JjZ1qSqphkD4TQwP2zYsByoiy75BKxaw@mail.gmail.com"
type="cite">
<meta http-equiv="Context-Type" content="text/html;
charset=windows-1252">
<div><br>
</div>
Thanks Vikram,
<div><br>
</div>
<div>Could you tell me from where i can download this Software "
CoolT" ? i have tried to Google but did not find it anyware. I
have even found one of your research paper. it seems you have
already worked on it. it will be great if you could guide me.</div>
<div><br>
</div>
<div><br>
<br>
<div>On Thu, Mar 8, 2012 at 7:37 PM, Sami, Vikram <span><<a
moz-do-not-send="true"
href="mailto:Vikram.Sami@perkinswill.com">Vikram.Sami@perkinswill.com</a>></span>
wrote:<br>
<blockquote>
<div lang="EN-US">
<div>
<p><span>Another option to look into is CoolT developed
by Nader Chalfoun at University of Arizona in
Tucson. It’s a Dos program that is based on
empirical data that they collected from the
extensive testing they did on Cool Towers (Passive
Downdraught Chimneys). </span></p>
<p><span> </span></p>
<p><span>Again – I would throw in words of caution.
Passive downdraught chimneys rely on buoyancy driven
forces – something that you cannot approximate with
a fan driven evaporative cooler or wind driven.
eQUEST might be able to model this, but its beyond
my knowledge. Also – The folks at UA (Nader Chalfoun
& Martin Yoklic) did some testing with cool
towers in enclosed spaces. I would try writing to
them to get some feedback on issues to consider. </span></p>
<p><span> </span></p>
<p><span>I think Nader is on this list – not sure if
he’s still active. </span></p>
<div>
<p><span> </span></p>
<p><b><span> </span></b></p>
<p><b><span>Vikram Sami</span></b><span>, LEED AP BD+C
</span></p>
<p><span>Sustainable Design Analyst </span></p>
<p>
<span>1315 Peachtree St. NE, Atlanta, GA 30309 </span></p>
<p><span>t: 404-443-7462 f: </span><span lang="ES">404.892.5823 </span><span>
e: <a moz-do-not-send="true"
href="mailto:vikram.sami@perkinswill.com">vikram.sami@perkinswill.com</a>
</span><span><a moz-do-not-send="true"
href="http://www.perkinswill.com/"><span>www.perkinswill.com</span></a></span><span>
</span></p>
<p><b><span>Perkins+Will.</span></b><span> </span><span>Ideas
+ buildings that honor the broader goals of
society</span><span> </span></p>
<p><span> </span></p>
<p><span> </span></p>
</div>
<p><b><span>From:</span></b><span> Mansi Jayswal
[mailto:<a moz-do-not-send="true"
href="mailto:ar.mansi.jayswal@gmail.com">ar.mansi.jayswal@gmail.com</a>]
<br>
<b>Sent:</b> Thursday, March 08, 2012 2:40 AM<br>
<b>To:</b> Design Builder USA<br>
<b>Cc:</b> Dahlstrom, Aaron; Sami, Vikram; <a
moz-do-not-send="true"
href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a></span></p>
<div>
<div><br>
<b>Subject:</b> Re: [Equest-users] Query regarding
PDEC ( Passive cooling ) simulation in eQuest </div>
</div>
<div>
<div>
<p> </p>
<div>
<p> </p>
</div>
<p>Thank you all for your quick response and
Information. </p>
<div>
<p> </p>
</div>
<div>
<p>
Is it possible that if i use PHDC software to
design the PDEC system and simulate the same
building in eQuest ?? PHDC software can give me
the required size of the passive down
draught evaporating cooling towers for the
building. </p>
</div>
<div>
<p> </p>
<div>
<p>On Wed, Mar 7, 2012 at 9:37 PM, Design
Builder USA <<a moz-do-not-send="true"
href="mailto:jcrossett@designbuilderusa.com">jcrossett@designbuilderusa.com</a>>
wrote: </p>
<p><span>You may wish to explore the free trial
of Design Builder, as it has CFD, natural
ventilation and evaporate cooling. </span> </p>
<div>
<p><span>Tho I am not sure if it can be used
for your passive cooling requirement or
not..</span> </p>
</div>
<div>
<p> </p>
</div>
<div>
<p><span>Best of luck</span> </p>
<div>
<div>
<div>
<p>On Wed, Mar 7, 2012 at 6:53 AM,
Dahlstrom, Aaron <<a
moz-do-not-send="true"
href="mailto:ADahlstrom@in-posse.com">ADahlstrom@in-posse.com</a>>
wrote: </p>
</div>
</div>
<blockquote>
<div>
<div>
<div>
<div>
<p><span>Mansi – </span> </p>
<p><span> </span> </p>
<p><span>We have done some
schematic modeling of wind
towers with Fluent, a CFD
package as noted.</span> </p>
<p>
<span>Our climate didn’t justify
evaporative pre-cooling.</span>
</p>
<p><span> </span> </p>
<p><span>eQUEST has a natural
ventilation module, which I
have not fully dived into. </span>
</p>
<p><span> </span> </p>
<p><span>I believe it requires
inputs that would likely be
validated by a CFD model – for
example, I don’t think
eQUEST’s natural ventilation
model allows for evaporative
pre-cooling as a temperature
driver for natural air
exchange in a space.</span> </p>
<p><span>As eQUEST models each
zone as a fully mixed space,
and has limited air transfer
between zones, you may also
have trouble getting the
thermal stratification from
eQUEST that would typically be
needed to drive natural
ventilation in a PDEC.</span>
</p>
<p><span> </span> </p>
<div>
<p><b><span>Aaron Dahlstrom ,
PE, LEED® AP</span></b> </p>
<p><b><span>In P</span></b><b><span>o</span></b><b><span>sse</span></b><span>
– </span><span>A subsidiary
of</span><span> </span><b><span>AKF</span></b><span>|
1500 Walnut Street, Suite
1414, Philadelphia, PA 19102
</span> </p>
<p><span>d: <a
moz-do-not-send="true"
href="tel:215-282-6753">215-282-6753</a>|
m: <a
moz-do-not-send="true"
href="tel:267-507-5470">267-507-5470</a>|
In Posse: <a
moz-do-not-send="true"
href="tel:215-282-6800">215-282-6800</a>|
AKF: <a
moz-do-not-send="true"
href="tel:215-735-7290">215-735-7290</a></span>
</p>
<p><span>e: <a
moz-do-not-send="true"
href="mailto:ADahlstrom@in-posse.com">ADahlstrom@in-posse.com</a>
| in posse web: <a
moz-do-not-send="true"
href="http://www.in-posse.com/">www.in-posse.com</a>
| akf web: <a
moz-do-not-send="true"
href="http://www.akfgroup.com/">www.akfgroup.com</a></span>
</p>
<p><span> </span> </p>
<p>
<span> </span> </p>
</div>
<p><span> </span> </p>
<div>
<div>
<p><b><span>From:</span></b><span>
<a moz-do-not-send="true"
href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>
[mailto:<a
moz-do-not-send="true"
href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Sami,
Vikram<br>
<b>Sent:</b> Wednesday,
March 07, 2012 8:53 AM<br>
<b>To:</b> Mansi Jayswal;
<a moz-do-not-send="true"
href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re:
[Equest-users] Query
regarding PDEC ( Passive
cooling ) simulation in
eQuest</span> </p>
</div>
</div>
<div>
<div>
<p> </p>
<p><span>Mansi,</span> </p>
<p>
<span> </span> </p>
<p><span>I doubt you can do
this credibly in eQUEST.
You really need a CFD type
package to be able to
simulate this. . A word of
caution – the effort to
develop the simulation for
this is a master’s thesis
in itself. </span> </p>
<p><span> </span> </p>
<p><span> </span> </p>
<p><span> </span> </p>
<p><b><span> </span></b> </p>
<p><b><span>Vikram Sami</span></b><span>,
LEED AP BD+C</span> </p>
<p><span>Sustainable Design
Analyst</span> </p>
<p>
<span>1315 Peachtree St. NE,
Atlanta, GA 30309</span> </p>
<p><span>t: <a
moz-do-not-send="true"
href="tel:404-443-7462">404-443-7462</a>
f: </span><span lang="ES"><a
moz-do-not-send="true"
href="tel:404.892.5823">404.892.5823</a> </span><span>
e: <a
moz-do-not-send="true"
href="mailto:vikram.sami@perkinswill.com">vikram.sami@perkinswill.com</a>
</span><span><a
moz-do-not-send="true"
href="http://www.perkinswill.com/"><span>www.perkinswill.com</span></a></span>
</p>
<p><b><span>Perkins+Will.</span></b><span>
</span><span>Ideas +
buildings that honor the
broader goals of society</span>
</p>
<p><span> </span> </p>
<p><span> </span> </p>
<p><b><span>From:</span></b><span>
<a moz-do-not-send="true"
href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>
<a moz-do-not-send="true"
href="mailto:[mailto:equest-users-bounces@lists.onebuilding.org]">[mailto:equest-users-bounces@lists.onebuilding.org]</a>
<b>On Behalf Of </b>Mansi
Jayswal<br>
<b>Sent:</b> Tuesday,
March 06, 2012 11:25 PM<br>
<b>To:</b> <a
moz-do-not-send="true"
href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b>
[Equest-users] Query
regarding PDEC ( Passive
cooling ) simulation in
eQuest</span> </p>
<p> </p>
<div>
<p> </p>
</div>
<p><span>Hello friends,</span>
</p>
<p><span> </span> </p>
<p><span>My name is Mansi
Jayswal. I am a final year
student of Masters
Programme at CEPT
University, India. By
profession I am an
architect. Currently I am
doing thesis on passive
cooling technique (Passive
down draught evaporative
cooling system- PDEC ).
And try to identified that
how much cooling load of
HVAC system can be
replaced through this
system.</span> </p>
<p><span> </span> </p>
<p><span>Now my query is that
is it eQuest is capable to
simulate such building
with wind tower or PHDC
(PDEC ) system? If anybody
knows please kindly reply.
I have very days left for
final submission and I am
stuck here.</span> </p>
<p><span> </span> </p>
<p><span>Thanks </span> </p>
<div>
<p> </p>
</div>
<p>-- </p>
<div>
<p><span><br>
Regards,</span> </p>
</div>
<div>
<p><span>Mansi Jayswal,</span>
</p>
</div>
<p><span>B.Arch I IGBC AP I
M.Tech in Climate Change
& Sustainable
Development </span> </p>
<div>
<p><span>Faculty of
Sustainable Environment
& Climate Change,</span>
</p>
</div>
<div>
<p><span>Centre for
Environmental Planning
& Technology (CEPT)
University</span> </p>
</div>
<p> </p>
</div>
</div>
</div>
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</p>
</div>
</blockquote>
</div>
<p><span><br>
<br>
</span></p>
<div>
<p><span> </span></p>
</div>
<p><span>-- </span></p>
<p><span>Jeremiah D. Crossett</span><span> </span></p>
<p><span>Energy Modeling Consultant </span><span>
</span></p>
<p><span>503-688-8951</span><span> </span></p>
<p><span><a moz-do-not-send="true"
href="http://www.DesignBuilder.com"><span>www.DesignBuilderUSA.com</span></a>
</span></p>
<p><span> </span></p>
<p><span> </span></p>
<div>
<p><span> </span></p>
<p><span> </span></p>
</div>
<p> </p>
</div>
</div>
<p><br>
<br>
</p>
<div>
<p> </p>
</div>
<p>-- <span> </span></p>
<div>
<p><span><br>
Regards, </span></p>
</div>
<div>
<p><span>Mansi Jayswal, </span></p>
</div>
<p><span>B.Arch I IGBC AP I M.Tech in Climate
Change & Sustainable Development </span></p>
<div>
<p><span>Faculty of Sustainable Environment
& Climate Change, </span></p>
</div>
<div>
<p><span>Centre for Environmental Planning &
Technology (CEPT) University </span></p>
</div>
<p> </p>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<br>
<br>
<div><br>
</div>
-- <br>
<div><br>
Regards,</div>
<div>Mansi Jayswal,</div>
B.Arch I IGBC AP I M.Tech in Climate Change & Sustainable
Development
<div>Faculty of Sustainable Environment & Climate Change,</div>
<div>Centre for Environmental Planning & Technology (CEPT)
University</div>
<br>
</div>
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