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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>For those of you who missed the post the other day regarding
modeling of water-cooled chillers, chilled water loops, and HVAC systems more
generally in IES <Virtual Environment> (see “One Model”
discussion thread just a couple days ago), the following excerpt duplicates the
text from that post regarding water-cooled chillers, chilled water loops. The
discussion of currently offered capability along these lines follows the description
of the development that is soon to be released.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>***<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Regarding the modeling of water-cooled chillers, chilled water
loops, and HVAC systems in IES <Virtual Environment>:<o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>While not yet publically released or announced, in-depth
capability for modeling water-cooled chillers and chilled water loops within
the IES <Virtual Environment> ApacheHVAC application has been developed
and implemented. This capability is presently undergoing testing and will be
available in the next release later this spring. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The new water-cooled chiller model is described by three
performance curves: <o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>varies cooling capacity with entering condenser water
temperature<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>varies electric input ratio (EIR) with chilled water temperature<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span
style='mso-list:Ignore'>3)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>varies electric input ratio (EIR) with part-load fraction. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>These scalable performance curves are pre-defined for common
chiller types: screw; centrifugal (hermetic, with or without VSD, and open);
and reciprocating (hermetic and open). Where water flow is variable,
performance curves are provided for pumps. These include
constant-speed/variable-flow “riding the pump curve” and
electronically commutated variable speed. For expert users, parameter values
are editable in the equations describing the performance curves for chillers
and pumps. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>In addition to selecting appropriate performance curves, the
user is able to specify interconnected performance inputs for capacity, COP,
condenser and chilled water temperatures, flow rates, and loop delta-T at both
rated and design conditions. An input is provided for the load fraction below
which the chiller will cycle on and off. The user also has control of operating
parameters such as condenser-water setpoint and variation of this setpoint via
a formula profile (which may reference outdoor or indoor conditions and other
sensed variables), chilled supply water temperature (SWT), and ramped SWT reset
between high and low outdoor temperature setpoints. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The cooling tower and condenser-water loop use essentially the
same cooling tower model that is provided for the waterside economizer
component in the current version of ApacheHVAC. The cooling tower model
presently includes a two-speed fan with flow fraction setting for each speed,
approach, range, and electric input ratio. This tower and condenser-water loop
model accounts for changes in outdoor conditions, chiller heat rejection, and
user-controlled tower operating parameters as described above. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Primary and secondary chilled water loops are modeled for the
first release of this new facility in a PRM-compliant “common pipe”
configuration. For this configuration, the primary loop uses a constant-speed
pump that operates whenever the chiller is running and the secondary loop with
flow controlled to maintain the specified CHW supply temperature and loop
delta-T. Either a constant-speed/variable-flow pump riding the pump curve or a
variable-speed pump with variable speed drive (VSD) can be specified for the
secondary (chilled-water distribution) loop. Cooling coils, chilled ceilings,
etc. are then assigned to the secondary loop associated with a particular
chiller.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The currently available release of the VE uses a simpler model
that does provide means of describing the performance of a water-cooled
chiller, cooling tower, and pumps in relation to both part-load fraction and
outdoor wet-bulb or dry-bulb temperatures. This is presently done via a matrix
of user input data points for the chiller COP, condenser-water pump power,
cooling tower fan power, and chilled-water pump power. With appropriate inputs,
the chiller COP in this simpler exiting model can be thus be varied according
to both load fraction and outdoor conditions, while the power for the
associated pumps and fans can separately be varied according to load fraction.
However, because this simpler model does not use the type of curves that many
EnergyPlus and DOE-2 users are accustomed to and does not explicitly model the
thermodynamics of the CW, primary CHW, and secondary CHW loops or their
controls, the new facilities described above have been developed to do just this.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hopefully this helps to clarify the current and near-term capabilities
of the VE for those concerned specifically with modeling HVAC systems.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<b><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></b></p>
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mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:
column;mso-element-left:-4.5pt;mso-height-rule:exactly'><b><span
style='font-size:13.0pt;font-family:"Calibri","sans-serif";color:navy'>Timothy
Moore <br>
</span></b><b><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:navy'>Senior Consultant<br>
Special Projects <o:p></o:p></span></b></p>
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exactly'><span style='font-size:8.0pt;font-family:"Calibri","sans-serif";
color:navy'>Office: 415 983-0603<br>
<u><a href="mailto:timothy.moore@iesve.com"><span style='color:navy'>timothy.moore@iesve.com</span></a></u><br>
</span><span style='font-family:"Calibri","sans-serif";color:#1F497D'><a
href="http://www.iesve.com/"><span style='font-size:8.0pt;color:navy'>www.iesve.com
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style='font-size:8.0pt;line-height:115%;font-family:"Calibri","sans-serif";
color:navy'>**Design, Simulate + Innovate with the <Virtual
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color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Benjamin
Jordan<br>
<b>Sent:</b> Thursday, March 26, 2009 12:12 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] Modeling a Cooling Tower<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal>Hello everyone,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'> I was curious if
anyone has a program or excel program that models the fan energy and pumping
energy of cooling towers. I currently use IES-VE, which does not have any
cooling tower capabilities (to my knowledge), so I end up calculating the fan
and pump energy for the cooling towers in a crude excel sheet. Does anyone have
a better way to do this that takes into account the air WB temp, load of the
building, and size of fan? Thanks for the help!<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>On Thu, Mar 26, 2009 at 3:01 PM, <<a
href="mailto:bldg-sim-request@lists.onebuilding.org">bldg-sim-request@lists.onebuilding.org</a>>
wrote:<o:p></o:p></p>
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Today's Topics:<br>
<br>
1. PhD position (Hensen, J.L.M.)<br>
2. Re: SunTools Plugin for SketchUp available (Zoeteman, Mark R.)<br>
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<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Wed, 25 Mar 2009 23:10:14 +0100<br>
From: "Hensen, J.L.M." <<a href="mailto:j.hensen@tue.nl">j.hensen@tue.nl</a>><br>
Subject: [Bldg-sim] PhD position<br>
To: "<a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a>"
<<a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a>><br>
Message-ID:<br>
<<a
href="mailto:CD91BC49A883474EAC61C23BC0F0071B01315DC02EE3@EXCHANGE10.campus.tue.nl">CD91BC49A883474EAC61C23BC0F0071B01315DC02EE3@EXCHANGE10.campus.tue.nl</a>><br>
<br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
We have a fully funded opening for a PhD researcher at Eindhoven University of
Technology.<br>
<br>
The title of the project is "Towards E+ steel-frame industrial hall:
simulation support for objective prediction of energy in use". The aim is
to enable an objective sustainability assessment of industrial halls and to
expand building energy simulation tools with models for new construction
materials, system components and possible system configurations to account for
the industrial hall construction specifics, process energy production and
on-site electricity generation.<br>
<br>
Further details are available at <a
href="http://www.m2i.nl/pro1/general/start.asp?i=0&j=0&k=0&p=0&itemid=387"
target="_blank">http://www.m2i.nl/pro1/general/start.asp?i=0&j=0&k=0&p=0&itemid=387</a><br>
<br>
Please don't hesitate to contact me for further information.<br>
<br>
I would appreciate it very much if you could pass this message to suitable
candidates.<br>
<br>
Thanks!<br>
Jan<br>
<br>
<br>
prof. dr. ir. Jan L.M. Hensen | <a href="http://www.bwk.tue.nl/bps/hensen"
target="_blank">www.bwk.tue.nl/bps/hensen</a><<a
href="http://www.bwk.tue.nl/bps/hensen" target="_blank">http://www.bwk.tue.nl/bps/hensen</a>>
| +31 (0)40 247 2988 | Building Physics & Systems | Eindhoven University of
Technology | P.O. Box 513 - VRT6.18 | 5600 MB EINDHOVEN, Netherlands<br>
<br>
<br>
<br>
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Message: 2<br>
Date: Thu, 26 Mar 2009 14:24:17 -0400<br>
From: "Zoeteman, Mark R." <mrzoeteman@FTCH.com><br>
Subject: Re: [Bldg-sim] SunTools Plugin for SketchUp available<br>
To: "Guedi Capeluto" <<a
href="mailto:arrguedi@techunix.technion.ac.il">arrguedi@techunix.technion.ac.il</a>>,<br>
<<a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a>><br>
Message-ID:<br>
<<a
href="mailto:425CE15142917C41857CF0D16D2C4D7F091821E9@ftchex3.corp.ftch.com">425CE15142917C41857CF0D16D2C4D7F091821E9@ftchex3.corp.ftch.com</a>><br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
Guedi:<br>
<br>
This does not seem ready for real use. We tried it and is very<br>
simplistic and does not seem to give functionality. It seems to do<br>
little more than plot points in model, but not analyze model. The<br>
internal SketchUp tools will do more than SunTools.<br>
<br>
Mark Zoeteman, FTC&H<br>
<br>
<br>
<br>
From: <a href="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a><br>
[mailto:<a href="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a>]
On Behalf Of Guedi<br>
Capeluto<br>
Sent: Tuesday, March 24, 2009 1:17 PM<br>
To: <a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
Subject: [Bldg-sim] SunTools Plugin for SketchUp available<br>
<br>
<br>
<br>
SunTools a new Plugin for SketchUp is available now.<br>
<br>
<br>
<br>
Plug-in Features<br>
<br>
- SunPATH: visualization (month and year)<br>
<br>
- SunPOS: Sun Position for a date and time<br>
<br>
- SunVIEW: Axonometric views from the Sun<br>
<br>
- SunPENETRATION: Analyze Sun Penetration/Access in any specific<br>
analysis point.<br>
<br>
<br>
<br>
The plug-in can be downloaded after registration from:<br>
<a href="http://tx.technion.ac.il/~arrguedi/SunTools/download.html"
target="_blank">http://tx.technion.ac.il/~arrguedi/SunTools/download.html</a><br>
<br>
<br>
<br>
Enjoy SunTools.<br>
<br>
<br>
<br>
Guedi Capeluto<br>
<br>
<a href="mailto:arrguedi@technion.ac.il">arrguedi@technion.ac.il</a><br>
<br>
<br>
<br>
Arch. Guedi Capeluto, D.Sc.<br>
Faculty of Architecture and Town Planning<br>
Technion - Israel Institute of Technology<br>
Technion City, Haifa 32000. Israel<br>
Tel:+972.4.8294012 Fax:+972.4.8294617<br>
<br>
email: <a href="mailto:arrguedi@tx.technion.ac.il">arrguedi@tx.technion.ac.il</a><br>
web : <a href="http://www.technion.ac.il/~arrguedi/"
target="_blank">http://www.technion.ac.il/~arrguedi/</a><br>
<br>
<br>
<br>
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