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<body class='hmmessage'><div dir='ltr'>Hi all,<br><br>I'm looking for guidance on the interpretation of CHP modeling according to Appendix B in the <i>LEED Canada Interpretation Guide for District Energy Systems</i> or Appendix D in the USGBC <i>Treatment of District or Campus Thermal Energy in LEED v2 and LEED 2009</i> using the Method 2/Option 2 route.<br><br>For the project that I'm working on, metered data is available. Annual metered electricity consumption shows that the campus uses 73%
of the electricity generated by the CHP plant with the remaining 27%
coming from grid supplied electricity. So, I intend to use this fraction
and apply it to the total electricity consumption of the proposed
building. Charge the 27% at the local grid supplied electricity rates
and charge the remaining 73% CHP generated electricity based on Annual
Fuel Input Cost to CHP ($)/Annual CHP Electricity Generation (kWh)<a class="glossary-term hovertip_target" href="http://www.leeduser.com/glossary/14#term4842"><span></span></a>.<br><br>
Again from metered data, 67% of the heating energy supplied to the
DES is from the waste heat generated by the CHP plant. The remaining 33%
is provided by backup boilers using grid supplied natural gas. So 67%
of the proposed building's heating energy will be "free" with the
remaining 33% charged based on local natural gas utility rates. I'm setting the proposed boiler efficiency equal to the back up boiler efficiency.<br><BR><br><BR>
The baseline building heating and electricity consumption will be charged at the local utility rates.<BR><br><BR>
Is this methodology acceptable for the proposed model? I'm not sure if I should be using the formulas provided in the Appendix to calculate <i>CHP Electric Output</i> and <i>CHP Fuel Input</i>? Are these formulas to be used when metered data is not available?<br><BR><br><BR>
Thanks<BR><br><BR>
Dónal<BR><br> </div></body>
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