Hi Johannes,
As I recall from memory, among other things Appendix D allocates a fraction
of the electricity produced by the CHP plant to the building(s) of interest *in
proportion to* the amount of district heating utilized by those building(s)
(a fraction of the recoverable heat energy produced). In post-processing
of your final results, this allocated annual electricity amount is
subtracted from the simulated annual electricity consumption.
This whole calculation/process doesn?t really care whether the electricity
is ?sold? or not. It just matters that it gets back onto the grid.
Does that help?
For perspective, I have now for a series of projects completed used
Appendix C and D in combination to handle the case of municipal district
heating loops (where some municipal facilities are CHP and some are
heating-only waste incinerators/boilers). If you have CHP ?on-site? and
owned/operated by the same building owners/developers as your building
project, at least be thankful that?s closer to the sort of case the DES
guidelines are written around =)!
If you eventually ?hit a wall? and remain unsure of exactly how to apply
the DES guidelines to your specific project (there are many real-world
cases where this set of guidance doesn?t quite seem to ?fit?), it would be
solid advice to do what I did (a few times) and reach out to GBCI in
writing with your site-specific questions ? ideally well in advance of your
preliminary submission! This sort of clarification doesn?t cost money but
can take some time, so plan accordingly.
~Nick
*NICK CATON, P.E.*
*Owner*
*Caton Energy Consulting*
306 N Ferrel
Olathe, KS 66061
office: 785.410.3317
www.catonenergy.com
*From:* bldg-sim-bounces at lists.onebuilding.org [mailto:
bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Hopf, Johannes
*Sent:* Thursday, August 02, 2012 10:40 AM
*To:* bldg-sim at lists.onebuilding.org
*Subject:* [Bldg-sim] Treatment of District or Campus Thermal Energy: CHP
feed-in tariff
Dear all,
in our case CHP-power is fed into the public grid because there is a good
feed-in-tariff for it. Now we we would like to know how we should treat
this under the headline of ?Treatment of District or Campus Thermal Energy?
for LEED certification.
Should we respect, that the electrical power is not consumed in the
building or follow Appendix D of the document, page 25 ?Proposed case:
allocate the electricity generation to the building based on the fraction
of thermal loads to the building for the DES sources that use recovered
waste heat?
We would very much appreciate any comment on that!
Kind regards
Johannes
