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<DIV dir=ltr align=left>To respond to your first question, you do have to add
extra resistance to underground floors/walls. Go to this site (<A
onclick="return top.js.OpenExtLink(window,event,this)"
href="http://simulationresearch.lbl.gov/dirun/23n_d_1.pdf"
target=_blank>http://simulationresearch.lbl<WBR>.gov/dirun/23n_d_1.pdf </A>) and
read the article that starts on page 19. You end up having to add an
effective R-value and a 1 foot layer of soil to your underground
constructions.<BR><BR>Alex</DIV>
<DIV> </DIV>
<DIV align=left><FONT face=Arial size=2>Alex Chapin, E.I.T.</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>Energy Engineer</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>2rw Consultants</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>T: 434-296-2116 ext. 101</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>F: 434-977-1862</FONT></DIV>
<DIV> </DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
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<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <B>On Behalf Of </B>McCready, Jessica<BR><B>Sent:</B>
Friday, October 26, 2007 6:19 PM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] eQuest
modeling<BR></FONT><BR></DIV>
<DIV></DIV><!-- Converted from text/rtf format -->
<P><FONT face="Times New Roman">Modeling multi family residential in
Canada.</FONT> </P>
<UL>
<UL>
<UL>
<P><FONT face=Arial size=2>1. Part of the first floor is below
grade.<BR>a. Does the model need to be adjusted for weaknesses in the DOE
analysis method?<BR>b. I’ve reviewed a report dated Oct 2003 that says
that there is an ‘anomaly’ in the way that DOE2 calculates heat loss to
the ground. The report says that DOE2 overestimates heat loss to
ground.<BR> Is the anomaly still
there, or has it been corrected? </FONT><BR><FONT face=Arial
size=2> c. The report suggests that the
correction be to increase the resistance of the floors/walls that are in
contact with ground. Is that right? By how
much?</FONT></P></UL></UL>
<P><FONT face=Arial size=2>2. The energy efficiency (EE) program we’re
evaluating works to eliminate thermal bridges, where possible, in the building
construction. (i.e. balconies outside of apartments)</FONT></P>
<UL>
<UL>
<P><FONT face=Arial size=2>a. How do I model a building with balconies but
no thermal bridges in the EE case?</FONT> <BR><FONT face=Arial size=2>b.
How do I add them in the baseline case?</FONT> <BR><FONT face=Arial
size=2>c. Another report models a ‘composite’ thermal resistance for walls
that accounts for the studs vs. the insulation in the wall construction to
account for the thermal bridges created by the wall studs. Is that the
correct way to do things?</FONT></P></UL></UL></UL>
<P><FONT face=Arial size=2>1) How do I convert
blower door test results at 50 Pa to natural infiltration?</FONT> <BR><FONT
face=Arial size=2>a. Rule of thumb seems to be
divide by 20</FONT>
<UL>
<UL>
<UL>
<P><FONT face=Arial size=2>b. </FONT> <FONT
face=Arial size=2>LBL method uses a factor N = C x H x S x L. C, H,
S, L based on climate, building height, leak shape, and wind
shielding. I cannot know leak shape and I do not know wind
shielding. Is there a way to determine ‘standard’ values for these
factors an still allow me to use building height and climate to adjust for
the N factor?</FONT></P></UL></UL></UL>
<P><FONT face=Arial size=2>2) Most thermostats in
Canada are bimetallic. The program requires electronic thermostats.
The consensus is that the electronic thermostats are able to hold the
temperature more precisely than the bimetallic thermostats.</FONT></P>
<P><FONT face=Arial size=2>a. Assumption is that
the ‘comfort’ temp is the lowest temp reached before the heating system is
activated. If bimetallic is set pt temp +- 2F, and the ‘comfort’ temp is
70F, then the bimetallic thermostat will be set at 72F to make sure the
temperature is always above comfort temp. If the electronic thermostat is
set pt temp +- 1F, then the electronic thermostat will be set at 71F.
Another report modeled this by changing the set point temperature by 1F to
account for the presence of the electronic vs. bimetallic thermostat.</FONT></P>
<UL>
<UL>
<UL>
<P><FONT face=Arial size=2>b. </FONT> <FONT
face=Arial size=2>Is there a way to model this in DOE2 (eQUEST) that
recognizes bimetallic vs. electronic thermostats?</FONT> </P></UL></UL></UL>
<P><FONT face=Arial size=2>3) The current
simulation only allows me to model the water heater outside of the heated living
space. However, the water heaters are located in the apartment and
therefore contribute to the thermal equation.</FONT></P>
<P><FONT face=Arial size=2>a. How do I model the
water heater in the apartment?</FONT>
<UL>
<UL>
<UL>
<P><FONT face=Arial size=2>b. </FONT> <FONT
face=Arial size=2>The water heaters are supposed to have insulated pipes
for the first 10 feet. How do I model that?</FONT> </P></UL></UL></UL>
<P><FONT face=Arial size=2>4) All units are
ventilated with outside air. The EE program requires them to have heat
recovery on their ventilation systems.</FONT></P>
<P><FONT face=Arial size=2>a. Are fan schedules
equal to the ventilation schedule if the heat system is electric
baseboard?</FONT>
<UL>
<UL>
<UL>
<P><FONT face=Arial size=2>b. </FONT> <FONT
face=Arial size=2>How do I simulate the heat recovery efficiency? I
know the efficiency at -25 degrees C only. Can I model the entire
system off that one point?</FONT></P></UL></UL></UL>
<P><FONT face=Arial size=2>5) How do I model a
ventilation system controlled by a humidistat? It seems to me that it
would be based on behavior patterns – when showers are taken, how long, cooking
practices, etc. Even if I know those things, how do I translate them into
a ventilation schedule – both cfm and how long the system is run?</FONT></P>
<P><FONT face=Arial size=2>Thanks for any input. Jessica</FONT> </P><PRE>
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