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<DIV></DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN class=515452820-30012012>I am modeling
an office building for LEED that uses district heating. I am electing
<STRONG>Option 2 (full accounting) – the aggregate building / DES
scenario</STRONG> under the <STRONG>Performance Path</STRONG> as described by
USGBC in their document entitled </SPAN><STRONG>Treatment of District or Campus
Thermal Energy in LEED V2 and LEED 2009 – Design<SPAN class=515452820-30012012>
</SPAN>& Construction</STRONG><SPAN
class=515452820-30012012><STRONG>.</STRONG> As I must create an on-site hot
water boiler in the proposed model, I am curious how other modelers go about
factoring in the leaks and thermal losses of the upstream transmission and
distribution system. In the aforementioned document under
</SPAN></FONT></FONT><SPAN class=515452820-30012012><FONT face=Arial><FONT
size=2><STRONG>2.4.1.2.1 Efficiency calculation</STRONG> it
states</FONT></FONT></SPAN></DIV>
<DIV><U>
<P><FONT size=2 face=Arial><EM>Proposed building, transmission and distribution
system</EM></FONT></U><FONT size=2 face=Arial><EM>: secondary pumping energy,
leaks, and thermal losses between the DES central plant and the connected
building in both directions must be accounted for in the Proposed Case model for
all cases where they apply. Projects shall use actual DES operational data if
the DES is pre-existing, or for new DES’s design estimates based on expected
operation may be substituted.</EM></FONT></P>
<P><SPAN class=515452820-30012012><FONT size=2 face=Arial>I know the
existing DH plant efficiency and also a separate percentage for the
upstream-from-building losses. How best to combine these to pass USGBC reviewer
muster is the question. Thank you in
advance.</FONT></SPAN></P></DIV></BODY></HTML>