[BLDG-SIM] CHP and LEED

[gail]

Hi Chris,

The Baseline building should be modeled with no generator (no CHP system).
In the Proposed building, you will model the CHP system with whatever heat
recovery is actually installed in the design.  You would not model any heat
recovery in the Baseline design unless condenser heat recovery is
prescriptively required (for 24-hour facilities with large DHW & cooling
loads).

It sounds from your description like the "backup source" for your absorption
cooling and heating would be natural gas.  The question is: what is used for
cooling and heating when the generator is out of service?  Do you have
natural gas boilers for backup?  Then your backup heating fuel source is
natural gas.  Do you have electric chillers operating when the generator is
off line or using its full waste heat capacity to drive heating and DHW?
Then your backup cooling fuel source is electricity.  Are you using steam or
hot water from your natural gas boilers to drive the absorption cooling
process when the generator is off line?  Then your backup cooling fuel
source is natural gas.

Best Regards,
Gail Stranske
CTG Energetics

On 5/23/07, Chris Jones <cj at cr-jay.ca> wrote:
>
> I am modelling a design with cogen for electricity, absorption
> cooling, space heat, domestic hot water.  I have read through the
> "CHP Calculation Methodology for LEED-NC v2.2 EA Credit 1" paper and
> I am not sure how to model the Baseline case for EA Credit 1.  It
> sounds like the Baseline case does get the same CHP system: "The
> Baseline Building heating and cooling plant utilizes the backup
> energy source(s) of the Design, or electricity if no backup source is
> present or specified." for Case 1 as is with my Design case.  I think
> that the cooling in the Baseline case would not make use of excess
> heat (absorption cooling).  Would the Baseline make use of excess heat for
> DHW?
>
>
>
>
>
> Chris Jones, P.Eng.
> 14 Oneida Avenue
> Toronto, ON M5J2E3
> Tel. 416 203-7465
> Fax. 416 946-1005
>
>
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