<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML dir=ltr><HEAD><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=unicode">
<META content="MSHTML 6.00.2900.2802" name=GENERATOR></HEAD>
<BODY>
<DIV id=idOWAReplyText16611 dir=ltr>
<DIV dir=ltr><FONT face=Arial color=#000000 size=2>Is there any comparison
between e+ and DOE 2 with regard to the accuracy of the predicted loads and
energy consumption? I'm curious about the benefits (in terms of accuracy)
obtained from simultaneously solving the building loads and HVAC
systems.</FONT></DIV>
<DIV dir=ltr><FONT face=Arial size=2></FONT> </DIV>
<DIV dir=ltr><FONT face=Arial size=2>Xiaobing</FONT></DIV></DIV>
<DIV dir=ltr><BR>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> bldg-sim@gard.com on behalf of Vämshi
Goojé<BR><B>Sent:</B> Thu 1/19/2006 8:30 AM<BR><B>To:</B>
bldg-sim@gard.com<BR><B>Cc:</B> bhandari@fenestration.com<BR><B>Subject:</B>
[bldg-sim] EnergyPlus - DOE<BR></FONT><BR></DIV>
<DIV><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="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<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 width="100%" SIZE=2>
</SPAN></FONT></DIV>
<P><B><FONT face=Tahoma size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">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>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>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 face=Tahoma color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Tahoma">That is a big
question.</SPAN></FONT></P>
<P><FONT face=Tahoma color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Tahoma"></SPAN></FONT> </P>
<P><FONT face=Tahoma color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Tahoma">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>http://www.energytoolsdirectory.gov/pdfs/contrasting_the_capabilities_of_building_energy_performance_simulation_programs_v1.0.pdf</A></SPAN></FONT></P>
<P><FONT face=Tahoma color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Tahoma"></SPAN></FONT> </P>
<P><FONT face=Tahoma color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Tahoma">Main differences
between DOE and EnergyPlus: </SPAN></FONT></P>
<P style="MARGIN-LEFT: 0.5in; TEXT-INDENT: -0.25in"><FONT face=Tahoma
color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Tahoma">1)</SPAN></FONT><FONT
color=navy size=1><SPAN style="FONT-SIZE: 7pt; COLOR: navy">
</SPAN></FONT><FONT face=Tahoma color=navy
size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Tahoma">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 face=Tahoma
color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Tahoma">2)</SPAN></FONT><FONT
color=navy size=1><SPAN style="FONT-SIZE: 7pt; COLOR: navy">
</SPAN></FONT><FONT face=Tahoma color=navy
size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Tahoma">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 face=Tahoma
color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Tahoma">3)</SPAN></FONT><FONT
color=navy size=1><SPAN style="FONT-SIZE: 7pt; COLOR: navy">
</SPAN></FONT><FONT face=Tahoma color=navy
size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Tahoma">There
are also key issues with the weighting factor assumptions, the wall convective
coefficients.</SPAN></FONT></P>
<P><FONT face=Tahoma color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Tahoma"></SPAN></FONT> </P>
<P><FONT face=Tahoma color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Tahoma">I haven't used
EnergyPlus much yet. What did I miss guys?</SPAN></FONT></P>
<P><FONT face=Tahoma color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Tahoma"></SPAN></FONT> </P>
<DIV>
<P><FONT face=Tahoma color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Tahoma">Brian
Fountain</SPAN></FONT></P>
<P><FONT face="Times New Roman" color=navy 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>bldg-sim@gard.com</A> [mailto:<A
href="mailto:bldg-sim@gard.com" target=_blank>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>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 face=Arial color=#0a2a3d
size=1><SPAN lang=PT
style="FONT-WEIGHT: bold; FONT-SIZE: 9pt; COLOR: rgb(10,42,61); FONT-FAMILY: Arial">Renato
Sousa</SPAN></FONT></B></SPAN> </P>
<P style="MARGIN-LEFT: 0.5in"><SPAN><B><FONT face=Arial color=#0a2a3d
size=1><SPAN lang=PT
style="FONT-WEIGHT: bold; FONT-SIZE: 7.5pt; COLOR: rgb(10,42,61); FONT-FAMILY: Arial">Tel:
+351 919 316 221 | E-mail: </SPAN></FONT></B></SPAN><SPAN><B><FONT
face=Arial color=#003dc4 size=1><SPAN lang=PT
style="FONT-WEIGHT: bold; FONT-SIZE: 7.5pt; COLOR: rgb(0,61,196); FONT-FAMILY: Arial"><A
title=mailto:renato.sousa@fluidinova.pt
href="mailto:renato.sousa@fluidinova.pt" target=_blank>
renato.sousa@fluidinova.pt</A></SPAN></FONT></B></SPAN></P>
<P style="MARGIN-LEFT: 0.5in"><B><FONT face=Arial color=black size=1><SPAN
lang=PT
style="FONT-WEIGHT: bold; FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: Arial"></SPAN></FONT></B> </P>
<P style="MARGIN-LEFT: 0.5in"><SPAN><B><FONT face=Arial color=#639c49
size=1><SPAN lang=PT
style="FONT-WEIGHT: bold; FONT-SIZE: 9pt; COLOR: rgb(99,156,73); FONT-FAMILY: Arial">___________________________________________________
</SPAN></FONT></B></SPAN></P>
<P style="MARGIN-LEFT: 0.5in"><SPAN><B><FONT face=Arial color=#639c49
size=1><SPAN lang=PT
style="FONT-WEIGHT: bold; FONT-SIZE: 9pt; COLOR: rgb(99,156,73); FONT-FAMILY: Arial">FluidInova,
Engenharia de Fluidos, SA</SPAN></FONT></B></SPAN></P>
<P style="MARGIN-LEFT: 0.5in"><SPAN><B><FONT face=Arial color=#0a2a3d
size=1><SPAN lang=PT
style="FONT-WEIGHT: bold; FONT-SIZE: 7.5pt; COLOR: rgb(10,42,61); FONT-FAMILY: Arial">TECMAIA
- Parque de Ci�ncia e Tecnologia da Maia</SPAN></FONT></B></SPAN></P>
<P style="MARGIN-LEFT: 0.5in"><SPAN><B><FONT face=Arial color=#0a2a3d
size=1><SPAN lang=PT
style="FONT-WEIGHT: bold; FONT-SIZE: 7.5pt; COLOR: rgb(10,42,61); FONT-FAMILY: Arial">Rua
Eng� Frederico Ulrich, n� 2650 | 4470-605 Moreira da Maia |
Portugal
</SPAN></FONT></B></SPAN></P>
<P style="MARGIN-LEFT: 0.5in"><SPAN><B><FONT face=Arial color=#0a2a3d
size=1><SPAN lang=PT
style="FONT-WEIGHT: bold; FONT-SIZE: 7.5pt; COLOR: rgb(10,42,61); FONT-FAMILY: Arial">Tel:
+351 229 408 265 | Fax: +351 229 408 266</SPAN></FONT></B></SPAN></P>
<P style="MARGIN-LEFT: 0.5in"><SPAN><B><FONT face=Arial color=#0a2a3d
size=1><SPAN lang=PT
style="FONT-WEIGHT: bold; FONT-SIZE: 7.5pt; COLOR: rgb(10,42,61); FONT-FAMILY: Arial">E-mail: </SPAN></FONT></B></SPAN>
<B><FONT face=Arial color=black size=1><SPAN lang=PT
style="FONT-WEIGHT: bold; FONT-SIZE: 9pt; COLOR: black; FONT-FAMILY: Arial"><A
title=mailto:geral@fluidinova.pt href="mailto:geral@fluidinova.pt"
target=_blank><SPAN><SPAN title=mailto:geral@fluidinova.pt><FONT color=#003dc4
size=1><SPAN
style="FONT-SIZE: 7.5pt; COLOR: rgb(0,61,196); TEXT-DECORATION: none"><SPAN
title=mailto:geral@fluidinova.pt><SPAN title=mailto:geral@fluidinova.pt><SPAN
title=mailto:geral@fluidinova.pt>geral@fluidinova.pt</SPAN></SPAN></SPAN></SPAN></FONT></SPAN></SPAN></A></SPAN></FONT></B><SPAN><B><FONT
face=Arial color=black size=1><SPAN lang=PT
style="FONT-WEIGHT: bold; FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: Arial">
| </SPAN></FONT></B></SPAN><SPAN><B><FONT face=Arial color=#0a2a3d
size=1><SPAN lang=PT
style="FONT-WEIGHT: bold; FONT-SIZE: 7.5pt; COLOR: rgb(10,42,61); FONT-FAMILY: Arial">Web: </SPAN></FONT></B></SPAN><SPAN>
<B><FONT face=Arial color=#639c49 size=1><SPAN lang=PT
style="FONT-WEIGHT: bold; FONT-SIZE: 7.5pt; COLOR: rgb(99,156,73); FONT-FAMILY: Arial"><A
href="http://www.fluidinova.pt/"
target=_blank>www.fluidinova.pt/</A></SPAN></FONT></B></SPAN></P>
<P style="MARGIN-LEFT: 0.5in"><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial"></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><PRE style="MARGIN-LEFT: 0.5in"><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt"> </SPAN></FONT></PRE><PRE style="MARGIN-LEFT: 0.5in"><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt"> </SPAN>
</FONT></PRE><PRE style="MARGIN-LEFT: 0.5in"><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt">==================</SPAN></FONT></PRE><PRE style="MARGIN-LEFT: 0.5in"><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt">
You received this e-mail because you are subscribed </SPAN></FONT></PRE><PRE style="MARGIN-LEFT: 0.5in"><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt">to the <A href="mailto:BLDG-SIM@GARD.COM" target=_blank>
BLDG-SIM@GARD.COM</A> mailing list. To unsubscribe </SPAN></FONT></PRE><PRE style="MARGIN-LEFT: 0.5in"><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt">from this mailing list send a blank message to </SPAN>
</FONT></PRE><PRE style="MARGIN-LEFT: 0.5in"><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt"><A href="mailto:BLDG-SIM-UNSUBSCRIBE@GARD.COM" target=_blank>
BLDG-SIM-UNSUBSCRIBE@GARD.COM</A></SPAN></FONT></PRE><PRE><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt"> </SPAN></FONT></PRE><PRE><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt"> </SPAN>
</FONT></PRE><PRE><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt">==================</SPAN></FONT></PRE><PRE><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt">You received this e-mail because you are subscribed
</SPAN></FONT></PRE><PRE><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt">to the <A href="mailto:BLDG-SIM@GARD.COM" target=_blank>BLDG-SIM@GARD.COM</A>
mailing list.� To unsubscribe </SPAN></FONT></PRE><PRE><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt">from this mailing list send a blank message to </SPAN></FONT></PRE><PRE><FONT face="Courier New" size=2>
<SPAN style="FONT-SIZE: 10pt"><A href="mailto:BLDG-SIM-UNSUBSCRIBE@GARD.COM" target=_blank>BLDG-SIM-UNSUBSCRIBE@GARD.COM</A></SPAN></FONT></PRE></DIV><PRE>You received this e-mail because you are subscribed <BR>to the <A href="mailto:BLDG-SIM@GARD.COM" target=_blank>BLDG-SIM@GARD.COM</A> mailing list. To unsubscribe
<BR>from this mailing list send a blank message to <BR><A href="mailto:BLDG-SIM-UNSUBSCRIBE@GARD.COM" target=_blank>BLDG-SIM-UNSUBSCRIBE@GARD.COM</A>
</PRE></BLOCKQUOTE></DIV><BR><BR clear=all><BR>-- <BR>Vämshi
Goojé<BR></DIV><PRE>
===========================
You received this e-mail because you are subscribed
to the BLDG-SIM@GARD.COM mailing list. To unsubscribe
from this mailing list send a blank message to
BLDG-SIM-UNSUBSCRIBE@GARD.COM
</PRE></BODY></HTML>