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Is the total cooling load less than 150 tons? If so there is a LEED
CIR which allows the use of System 3 in comparison to a GSHP. This
will garner you more "savings/points".<br><br>
If greater than 150 tons you use System 6 with a cooling tower and
WSHPs.<br><br>
You cannot take credit for lowering cooling energy due to a non-regulated
component such as appliances under EAc1. The energy use for these
items must be identical in the proposed and budget models. Savings
in this area could be eligible for an innovation point, see the numerous
CIRs on this subject for more guidance. <br><br>
At 03:29 PM 2/8/2005, you wrote:<br>
<blockquote type=cite class=cite cite="">I humbly request the advice of
any/all energy experts that are familiar with LEED and ASHRAE
90.1<br><br>
We've been asked to perform the energy modeling for a LEED project and
could use the experience of the masses to help us past a stumbling block
that we've run into. A little background. The project is a
4-story major remodeling project that has converted an old office
building to new condominiums. The building is equipped with
multiple geothermal heat pumps (1 or 2 per condo) and utilizes a vertical
bore ground heat exchanger system for the source/sink for the heat
pumps. After modeling the as-built system in detail using TRNSYS,
it is time for us to fill out the energy cost budget report and get the
base-building system modeled. Reviewing ASHRAE 90.1-99 we are
directed to Table 11.4.3 (the HVAC Systems Map) that shows the budget
system type as System 6; Water-Source Heat Pumps. The heating
system type for this system is listed as "electric heat pumps and
boiler". So far so good, no problems here understanding the
intent. However the cooling type is listed as "direct
expansion" with a note that states the fuel type for the budget
building system must match the fuel type for the proposed design.
Fair enough, we have geothermal heat pumps providing the cooling so the
fuel type for the budget cooling system should then be electricity.
But here we run into the stumbling block. Typically water-source
heat pumps would employ a cooling tower for the heat rejection; is that
what is meant/intended - ok forget meant/intended, let's go with
"required" - by the standard? Typically "direct
expansion" refers to a chiller; most likely an air-cooled chiller
for this application, or sometimes even a PTAC. However, a base
case system that utilizes water source heat pumps and a boiler for
heating, and a chiller with fan coils (or a PTAC) for cooling just
doesn't make any sense....<br><br>
If the guideline is intentionally vague and I have complete flexibility
in choosing an electric cooling option for the budget building (within
the minimum performance guidelines) does anyone have any recommendations
for the "worst" system type for the budget building that will
maximize the EA credits and still meet the 90.1 requirements? We're
right on the borderline of LEED Silver and a few percentage points in
energy savings can make a big difference in the number of points
received.<br><br>
One last question as long as I still have your attention. Its our
understanding that the building plug loads (non-lighting) are a
non-regulated item for LEED and we cannot take direct credit for
installing high-efficiency appliances. However, can the indirect
credit of lower cooling energy consumption as a result of lower cooling
loads from reduced internal gains be used for the proposed
building? Are we in a gray area here? And if so, how gray -
charcoal?<br><br>
Thanks in advance for any help that you are able to provide; its been a
frustrating couple of days trying to decipher the documents.<br><br>
Jeff<br><br>
<br>
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</blockquote>
<x-sigsep><p></x-sigsep>
<font size=4 color="#008000">Marcus B.
Sheffer
energy & environmental consulting<br>
Energy Opportunities,
Inc
717-292-2636<br>
1200 E Camping Area
Road
Fax: 717-292-0585 <br>
Wellsville, PA USA 17365-9783
sheffer@sevengroup.com<br>
a 7group
company
<a href="http://www.sevengroup.com/" eudora="autourl"><u>www.sevengroup.com<br>
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