Hello All!
I'm working on a Whole Building Simulation according 90.1-2004 for a C&S
Project. We use heating energy from a district heating network. Heat is
generated by about 20 different plants which feed the network. Some plants
are heating only, but the majority are cogeneration plants.
We would like to apply for points in Step 2 (Required Treatment of District
Thermal Energy) but we cannot verify the annual efficiency of the plants.
#####
CHP Calculation Methodology for LEED-NC v2.2 EA Credit 1:
1. The minimum annual CHP system efficiency must be at least 60%. Efficiency
is expressed by the following equation:
Annual CHP Efficiency = (Annual Btu electrical output of the fuel-driven
electricity
generator + Annual Btu Thermal Product) / Annual Btu fuel input (Lower
Heating Value of input fuel)
#####
Is there a way to apply for points using a default annual efficiency? Sth.
like described in "Required Treatment of District Thermal Energy" on page 7
and 8?
Any other ideas?
Best regards
Johannes.
On page 1 of the DES dated May 28, 2008, second to last paragraph says: "However, this district thermal energy .......supersedes the CHP........"
So I would think you have to use the DES paper and you can apply the defaults which are very low compared to ASH 90.1-2004 base.
I don't know what's your desired LEED Point EAc1 list, but will be tough to get a lot without having a lot of cogen/renewable.
Nikola
But I think it only supersedes if there is a conflict. The requirement
"annual CHP eff" is only in the CHP calc. Methodology, not in the "Required
Treatment of District.."-document.
In another project the leedreviewteam didn?t accept our solution. So I think
you must prove the annual efficiency.
In my project I get 6 points in step 1 and 13 (theoretical points) in Step 2.
It?s C&S 2.0 so the maximum is 10 points. So without CHP it is not too bad,
but it would be easy points..
Johannes
Von: Nikola Kravik [mailto:nkravik at rumseyengineers.com]
Gesendet: Dienstag, 27. April 2010 17:46
An: Hopf, Johannes; bldg-sim at lists.onebuilding.org
Betreff: RE: [Bldg-sim] LEED - Treatment of District Thermal Energy -
Annualefficiency
On page 1 of the DES dated May 28, 2008, second to last paragraph says:
"However, this district thermal energy .......supersedes the CHP........"
So I would think you have to use the DES paper and you can apply the defaults
which are very low compared to ASH 90.1-2004 base.
I don't know what's your desired LEED Point EAc1 list, but will be tough to
get a lot without having a lot of cogen/renewable.
Nikola