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<DIV dir=ltr align=left><SPAN class=034073302-07032007><FONT
face="Lucida Console" color=#0000ff size=2>Thanks for getting this going Varkie,
it has been a great topic...</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=034073302-07032007><FONT
face="Lucida Console" color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=034073302-07032007><FONT
face="Lucida Console" color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=034073302-07032007><FONT
face="Lucida Console" color=#0000ff size=2>Having just modeled a heat recovery
system for a large 100% outside air system with runaround waterside heat
recovery, I can answer a couple of your questions (staying far away from
LEED interpretations):</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=034073302-07032007><FONT
face="Lucida Console" color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=034073302-07032007><FONT
face="Lucida Console" color=#0000ff size=2>1) To turn off the airside economizer
in eQuest, set the 'Minimum OA Control Method' to 'Fraction of Design Flow'
(OA-CONTROL = FIXED).</FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2>2a) The 'waterside economizer' terminology is a bit ambiguous, in my
understanding it's referring only to 'free cooling' available by running
cold condenser water through chillers that are off. Something
like 15 to 20% of a chiller's rated capacity may be utilized in cold months
without running the compressor given the right ambient
conditions. </FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2>2b) If its a runaround waterside economizer you want, with
recovery coils constantly in the outdoor and exhaust air streams, then use the
airside economizer and set up the parametric run along the lines of the
following example:</FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2>$ adjust the supply and returns statics of the main unit to
</FONT></SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2>$ account for the increased pressure
drop<BR></FONT></SPAN></FONT></SPAN><SPAN class=034073302-07032007><FONT
face="Lucida Console" color=#0000ff size=2>SUPPLY-STATIC =
6.00</FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2>RETURN-STATIC = 3.00</FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2>ERV-RECOVER-TYPE = SENSIBLE-HX</FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2>$ specify OA and EXH flows if only a portion of the exhaust is
recovered<BR>ERV-OA-FLOW =
46960<BR>ERV-EXH-FLOW = 28590</FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2>$ potentially the effectiveness can increase to 0.75 if a two-pass coil
used</FONT></SPAN><BR>ERV-SENSIBLE-EFF =
0.53<BR>ERV-RUN-CTRL = OA-EXHAUST-DT<BR>ERV-RECOVER-MODE
= OA-HEAT/COOL</FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2>$ some may argue this control method, FLOAT gives maximum heat
recovery</FONT></SPAN></FONT></SPAN><BR>ERV-TEMP-CTRL =
FLOAT<BR>ERV-CAP-CTRL = MODULATE-HX</FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2>$ input the runaround pump power consumption here, it will be
switched</FONT></SPAN></FONT></SPAN></FONT></SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2><SPAN class=034073302-07032007>$ on only when the ERV is
activated</SPAN></FONT></SPAN></FONT></SPAN><BR>ERV-HX-KW
= 4.5<BR>ERV-FANS =
HVAC-SUPPLY/RETURN<BR>ERV-MOTOR-CLASS = HI-EFF</FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2>$ set the ERV statics to zero, since it is NOT a separate unit
</FONT></SPAN></FONT></SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2>$ in series with the main
unit</FONT></SPAN></FONT></SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2>ERV-OA-STATIC = 0<BR>ERV-EXH-STATIC =
0<BR>ERV-FROST-CTRL = USE-CAP-CTRL</FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2>Hope that helps, corrections and improvements will be posted
here:</FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2><A
href="http://elcca-exchange.blogspot.com/2007/02/equest-heat-recovery.html">http://elcca-exchange.blogspot.com/2007/02/equest-heat-recovery.html</A></FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2>Regards</FONT></SPAN></DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=034073302-07032007><FONT face="Lucida Console" color=#0000ff
size=2>Brandon</DIV>
<DIV><BR></DIV></FONT></SPAN>
<DIV dir=ltr align=left><BR></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <B>On Behalf Of </B>Varkie Thomas<BR><B>Sent:</B>
Tuesday, March 06, 2007 3:59 PM<BR><B>To:</B> BLDG-SIM@gard.com<BR><B>Cc:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] RE: Process Loads and
LEED<BR></FONT><BR></DIV>
<DIV></DIV>
<P>Thanks for all the responses. It does not solve my problem where the
proposed process load in this “office” building that I am looking at is more
than 60% of the total annual energy use. Here is a
suggested solution. The proposed process load should be entered in
the baseline and proposed models since it affects the heating and cooling loads
and the difference in efficiencies of the baseline and proposed systems serving
the loads. However, when determining the percent energy savings for LEED
certification, the common process load should be removed from both sides.</P>
<P>I apologize for bothering BLDG-SIM subscribers with more questions because of
my ignorance.<o:p></o:p></P>
<P>A high process load offsets the heating load in the perimeter zones and you
can get a building in a cold climate with no heating. If the perimeter
zone is reduced to 1 foot with no process loads, people or lighting, then
the computer program will not account for the benefit of day-lighting
on the lighting system unless the program can ignore this perimeter zone
and apply day-lighting to the adjacent zone if it is separated by an
“AIR-WALL” (DOE2.1E). </P>
<P>The building that I am looking at has ceiling PIU boxes designed to
serve a less than 1 foot perimeter zone and UFAD PIU boxes serving the
interior zone. Both sets of PIU boxes are served by the same system.<SPAN
style="mso-spacerun: yes"> </SPAN>In this building, the glass height is 12
feet and the ceiling height, beyond the 1 foot perimeter zone, is 10 feet.<SPAN
style="mso-spacerun: yes"> </SPAN>Since the zone depth entered into the
program is 15 feet and has a 10 foot ceiling, eQUEST flags it down as an error
but not DOE2.1E.<SPAN style="mso-spacerun: yes"> </SPAN>Perhaps VisualDOE
will not call this an error.<o:p></o:p></P>
<P>How would you turn off the Airside Economizer in a DOE2 based program.
With TRACE700 you can say Yes or No. Climate zone 3A does not require and
airside economizer for the baseline for a large office building. Setting
the “Drybulb High Limit” and the “Economizer Low Limit” in eQUEST to their
maximum values of 80F seems to do the trick. I cannot find the Waterside
Economizer in eQUEST although the keywords and commands for modeling
this, exists in both DOE2.1E and DOE2.2.<o:p></o:p></P>
<P>How is the Zone-Fan-Ratio (ZFR) determined for Fan Powered Terminal
Boxes? In eQUEST the default for Series FPB is 1.0 and for Parallel it is
0.5. How was this determined.<SPAN style="mso-spacerun: yes">
</SPAN>The definition in the DOE2.2 manual is: <SPAN
style="mso-spacerun: yes"> </SPAN>ZFR * Primary CFM = FPB Supply CFM.<SPAN
style="mso-spacerun: yes"> </SPAN></P>
<P>In the case of the project I am looking at (a UFAD system with Parallel FPBs)
the Primary Air Temp is 48F (for dehumidification), the FPB Supply Air Temp =
65F and Recirculation Air Temp is 78F. What is the ZFR? Would
an increase in ZFR reduce the energy use.<SPAN
style="mso-spacerun: yes"> </SPAN>The Simulation Guidebook by Energy
Design Resources suggests putting 25% of the people and 33% of lights and
equipment in the ceiling plenum.<SPAN style="mso-spacerun: yes">
</SPAN>This produced very little in energy savings.<SPAN
style="mso-spacerun: yes"> </SPAN></P>
<P>Is this an acceptable solution:</P>
<H1 style="MARGIN: 12pt 0in 3pt"><SPAN
style="FONT-WEIGHT: normal; FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-weight: bold">Summer
Cooling Indoor Temp:<SPAN style="mso-spacerun: yes"> </SPAN>From 0’ to 7’
at 75 F.<SPAN style="mso-spacerun: yes"> </SPAN>From 7’ to 10’ at 85
F<SPAN style="mso-spacerun: yes"> </SPAN><SPAN
style="mso-spacerun: yes"> </SPAN>Average Temp = 78 F.<SPAN
style="mso-spacerun: yes"> </SPAN>(0.7*75) + (0.3*85) =
78<o:p></o:p></SPAN></H1>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt">Winter Heating Indoor Temp:<SPAN
style="mso-spacerun: yes"> </SPAN>From 0’ to 7’ at 72 F.<SPAN
style="mso-spacerun: yes"> </SPAN>From 7’ to 10’ at 62 F<SPAN
style="mso-spacerun: yes"> </SPAN><SPAN
style="mso-spacerun: yes"> </SPAN>Average Temp = 69 F.<SPAN
style="mso-spacerun: yes"> </SPAN>(0.7*72) + (0.3*62) = 69<o:p></o:p></P>
<P class=MsoBodyText style="MARGIN: 0in 0in 6pt">(As with the theoretical method
of moving internal loads to the plenum, the fact that hot air collects at the
top should be not an issue since we are looking at heating only the mass of air
from 0’ to 7’ to 72 F).<o:p></o:p></P>
<P>How would you account for the energy savings using ECM motors. One
suggestion is to reduce the energy use of the fans in PIU boxes by 25%.
The default KW/CFM in eQUEST is 0.00033 (0.33 kw for a 1000 cfm box).
Reducing this by 25% <SPAN style="mso-spacerun: yes"> </SPAN>produced
almost no energy savings using eQUEST.</P>
<P>According to the Code of<SPAN style="mso-spacerun: yes"> </SPAN>Federal
Regulations (10CFR435/436) occupancy based lighting sensors can be modeled by
reducing the lighting schedule/profile fraction by 30%.<SPAN
style="mso-spacerun: yes"> </SPAN>Is this acceptable to LEED?<SPAN
style="mso-spacerun: yes"> </SPAN>I am assuming that occupancy based
ventilation can be modeled by creating a MIN-AIR-SCH (DOE2.1E) that is equal to
the design OA fraction (from a trial run) multiplied by the occupancy schedule
fraction.</P>
<P>The energy program developers should provide guidelines for modeling energy
conservation measures using their programs.<SPAN
style="mso-spacerun: yes"> </SPAN>Code and LEED authorities should test
them and approve them.<SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><o:p> </o:p></P>-----
Original Message ----- <BR>From: Mike Tillou <miket@etcgrp.com> <BR>Date:
Tuesday, March 6, 2007 4:21 pm <BR>Subject: RE: [BLDG-SIM] Process Loads and
LEED <BR>To: thomasv@iit.edu, BLDG-SIM@gard.com <BR><BR><SPAN>
<P>
<DIV><SPAN class=025560622-06032007><FONT face=Arial color=#0000ff size=2>I went
back and looked at the public review version of LEED 2.2 dated December 2004 on
the cover and October 19 in the footer. Here is how the original credit
was proposed:</FONT></SPAN></DIV>
<DIV><SPAN class=025560622-06032007>
<P align=left><EM><SPAN class=025560622-06032007>"</SPAN>Must be compared
against a baseline building that both complies with Appendix G to Standard
90.1-2004 (without amendments) and that has a process energy consumption that
is<SPAN class=025560622-06032007> </SPAN>a minimum of 25% of the total energy
consumption for the baseline building.<SPAN
class=025560622-06032007>"</SPAN></EM></P>
<P align=left><SPAN class=025560622-06032007><SPAN
class=025560622-06032007><FONT face=Arial color=#0000ff size=2>In the final
version of the the LEED 2.2 dated October 2005 that same verbiage had been
changed to </FONT></SPAN></SPAN></P><SPAN class=025560622-06032007><SPAN
class=025560622-06032007>
<P align=left><EM><SPAN class=025560622-06032007>"Must </SPAN>be compared
against a baseline building that complies with Appendix G to Standard<SPAN
class=025560622-06032007> </SPAN>90.1-2004 (without amendments). The default
process energy cost is 25% of the total energy<SPAN
class=025560622-06032007>"</SPAN></EM></P>
<P align=left><FONT face=Arial color=#0000ff size=2> <SPAN
class=025560622-06032007>I think the intent is that the default process energy
cost used in the calculation of LEED credits for V2.2 is a max of 25%.
<FONT color=red><STRONG>If your building has 60% process energy you would only
have to count that portion of process energy that equals 25% of the
total energy.</STRONG></FONT> This would level the playing field for all
buildings regardless of how much process energy is used. If a building
uses less than 25% then you have to justify the legitimacy of that claim.
</SPAN></FONT></P>
<P align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=025560622-06032007>I think someone should submit a CIR asking whether this
is the correct interpretation of the Credit.</SPAN></FONT></P>
<P align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=025560622-06032007>Respectfully,</SPAN></FONT></P>
<P align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=025560622-06032007>Mike</SPAN></FONT></P>
<P align=left></SPAN></SPAN></SPAN><SPAN lang=en-us><FONT face="Swis721 Blk BT"
size=2>Michael Tillou, PE</FONT></SPAN> <BR><SPAN lang=en-us><FONT
face="Swis721 Blk BT" size=1>ETC Group - Energy Engineering for a Sustainable
Future</FONT></SPAN> <BR><SPAN lang=en-us><FONT face="Swis721 Blk BT"
size=1>Ph:413-458-9870</FONT></SPAN> </P></DIV></SPAN><PRE>
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