<br>Mahabir,<br>
The extended run time in EPlus could be due to transient analysis vs. steady state in doe 2.<br>
Vamshi<br>
<br><div><span class="gmail_quote">On 1/18/06, <b class="gmail_sendername">Mahabir Bhandari</b> <<a href="mailto:bhandari@fenestration.com">bhandari@fenestration.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>
<p><font face="Times New Roman" size="2"><span style="font-size: 11pt;">Brian,</span></font></p>
<p><font face="Times New Roman" size="2"><span style="font-size: 11pt;"> </span></font></p>
<p><font face="Times New Roman" size="2"><span style="font-size: 11pt;">I think one additional difference from uses' point of view, which
is not reported in this report, is simulation run time. It seems EnergyPlus
takes 5-10 times longer to complete a whole year simulations than DOE2. I was
running a simple 5 story building with VAV system and it took me more than 40
minutes for annual hourly simulations (1 hr time step) in EnergyPlus while eQuest
could run the same building in less than 5 minutes. I am interested in hearing
from others on the run time issue.</span></font></p>
<p><font face="Times New Roman" size="2"><span style="font-size: 11pt;"> </span></font></p>
<p><font face="Times New Roman" size="2"><span style="font-size: 11pt;">Mahabir Bhandari</span></font></p>
<p><font face="Times New Roman" size="2"><span style="font-size: 11pt;"> </span></font></p>
<p><font face="Times New Roman" size="2"><span style="font-size: 11pt;"> </span></font></p>
<div>
<div style="text-align: center;" align="center"><font face="Times New Roman" size="3"><span style="font-size: 12pt;">
<hr align="center" size="2" width="100%">
</span></font></div>
<p><b><font face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">From:</span></font></b><font face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma;"> Brian Fountain
[mailto:<a href="mailto:bfountain@greensim.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">bfountain@greensim.com</a>] <br>
<b><span style="font-weight: bold;">Sent:</span></b> Wednesday, January 18, 2006
12:12 PM<br>
<b><span style="font-weight: bold;">To:</span></b> <a href="mailto:bldg-sim@gard.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">bldg-sim@gard.com</a><br>
<b><span style="font-weight: bold;">Subject:</span></b> [bldg-sim] EnergyPlus -
DOE</span></font></p>
</div>
<p><font face="Times New Roman" size="3"><span style="font-size: 12pt;"> </span></font></p>
<p><font color="navy" face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; color: navy;">That is a big question.</span></font></p>
<p><font color="navy" face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; color: navy;"> </span></font></p>
<p><font color="navy" face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; color: navy;">For a comparison of current energy
simulation software, you could look at Dru Crawley's paper comparing 20
tools:</span></font></p>
<p><font face="Book Antiqua" size="2"><span style="font-size: 10pt;"><a href="http://www.energytoolsdirectory.gov/pdfs/contrasting_the_capabilities_of_building_energy_performance_simulation_programs_v1.0.pdf" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
http://www.energytoolsdirectory.gov/pdfs/contrasting_the_capabilities_of_building_energy_performance_simulation_programs_v1.0.pdf</a></span></font></p>
<p><font color="navy" face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; color: navy;"> </span></font></p>
<p><font color="navy" face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; color: navy;">Main differences between DOE and
EnergyPlus: </span></font></p>
<p style="margin-left: 0.5in; text-indent: -0.25in;"><font color="navy" face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; color: navy;">1)</span></font><font color="navy" size="1"><span style="font-size: 7pt; color: navy;">
</span></font><font color="navy" face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; color: navy;">DOE calculates the space loads for each hour then calculates the
system and plant response for each hour. EnergyPlus simultaneously solves
the loads the system/plant response for each timestep.</span></font></p>
<p style="margin-left: 0.5in; text-indent: -0.25in;"><font color="navy" face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; color: navy;">2)</span></font><font color="navy" size="1"><span style="font-size: 7pt; color: navy;">
</span></font><font color="navy" face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; color: navy;">DOE has a fixed 1 hour timestep, EnergyPlus has a variable timestep
(down to 1 minute?).</span></font></p>
<p style="margin-left: 0.5in; text-indent: -0.25in;"><font color="navy" face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; color: navy;">3)</span></font><font color="navy" size="1"><span style="font-size: 7pt; color: navy;">
</span></font><font color="navy" face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; color: navy;">There are also key issues with the weighting factor assumptions,
the wall convective coefficients.</span></font></p>
<p><font color="navy" face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; color: navy;"> </span></font></p>
<p><font color="navy" face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; color: navy;">I haven't used EnergyPlus much
yet. What did I miss guys?</span></font></p>
<p><font color="navy" face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; color: navy;"> </span></font></p>
<div>
<p><font color="navy" face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; color: navy;">Brian Fountain</span></font></p>
<p><font color="navy" face="Times New Roman" size="3"><span style="font-size: 12pt; color: navy;"> </span></font></p>
</div>
<p style="margin-left: 0.5in;"><font face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma;">-----Original Message-----<br>
<b><span style="font-weight: bold;">From:</span></b> <a href="mailto:bldg-sim@gard.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">bldg-sim@gard.com</a>
[mailto:<a href="mailto:bldg-sim@gard.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">bldg-sim@gard.com</a>] <b><span style="font-weight: bold;">On Behalf Of </span></b>Renato
Sousa<br>
<b><span style="font-weight: bold;">Sent:</span></b> January 18, 2006 10:56 AM<br>
<b><span style="font-weight: bold;">To:</span></b> <a href="mailto:bldg-sim@gard.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">bldg-sim@gard.com</a><br>
<b><span style="font-weight: bold;">Subject:</span></b> [bldg-sim] EnergyPlus -
DOE</span></font></p>
<p style="margin-left: 0.5in;"><font face="Times New Roman" size="3"><span style="font-size: 12pt;"> </span></font></p>
<div>
<p style="margin-left: 0.5in;"><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Hello everybody.</span></font></p>
</div>
<div>
<p style="margin-left: 0.5in;"><font face="Times New Roman" size="3"><span style="font-size: 12pt;"> </span></font></p>
</div>
<div>
<p style="margin-left: 0.5in;"><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">I would like to know if anybody has
experience on using both EnergyPlus and DOE.</span></font></p>
</div>
<div>
<p style="margin-left: 0.5in;"><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Currently I'm using an interface for
EnergyPlus. From the software description I couldn't find out the main
differences between EnergyPlus and DOE. Does anyone know the main differences
or where can I find them?</span></font></p>
</div>
<div>
<p style="margin-left: 0.5in;"><font face="Times New Roman" size="3"><span style="font-size: 12pt;"> </span></font></p>
</div>
<div>
<p style="margin-left: 0.5in;"><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">From the description it is said that
EnergyPlus was based on DOE and BLAST so I suppose EnergyPlus has some extra
features but I'm not sure if that is right.</span></font></p>
</div>
<div>
<p style="margin-left: 0.5in;"><font face="Times New Roman" size="3"><span style="font-size: 12pt;"> </span></font></p>
</div>
<div>
<p style="margin-left: 0.5in;"><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Best regards,</span></font></p>
</div>
<div>
<p style="margin-left: 0.5in;"><span><b><font color="#0a2a3d" face="Arial" size="1"><span style="font-size: 9pt; font-family: Arial; color: rgb(10, 42, 61); font-weight: bold;" lang="PT">Renato Sousa</span></font></b></span>
</p>
<p style="margin-left: 0.5in;"><span><b><font color="#0a2a3d" face="Arial" size="1"><span style="font-size: 7.5pt; font-family: Arial; color: rgb(10, 42, 61); font-weight: bold;" lang="PT">Tel: +351 919 316 221
| E-mail: </span></font></b></span><span><b><font color="#003dc4" face="Arial" size="1"><span style="font-size: 7.5pt; font-family: Arial; color: rgb(0, 61, 196); font-weight: bold;" lang="PT"><a href="mailto:renato.sousa@fluidinova.pt" title="mailto:renato.sousa@fluidinova.pt" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
renato.sousa@fluidinova.pt</a></span></font></b></span></p>
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</blockquote></div><br><br clear="all"><br>-- <br>Vämshi Goojé<br>