[Bldg-sim] Process Loads?

[Karen Walkerman]

For energy intensive environments, I have had LEED accept a lesser process
load, especially when the building in question is a renovation to an
existing building with poor original envelope.  If you had the process load
equal between the baseline and proposed, and the baseline is really
inefficient, then sometimes the process load completely dwarfs the load of
the proposed building.  It makes more sense to estimate the process load
based on reasonable power densities and use schedules for the space types.

I have successfully used the miscellaneous power densities given in the
90.1-2004 User's Manual to define process loads for LEED projects.

--
Karen



On Wed, Feb 4, 2009 at 6:56 PM, Demba Ndiaye <Demba.Ndiaye at uoit.ca> wrote:

>  The process energy cost should compose at least 25% of the total energy
> cost.
>
>
>
> And yes, if you have a total cost of $1,333 then the process energy should
> be >= $333.
>
>
>
> _____________
>
> Demba Ndiaye
>
>
>
> *From:* bldg-sim-bounces at lists.onebuilding.org [mailto:
> bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Anis Ben Ayed
> *Sent:* Wednesday, February 04, 2009 6:33 PM
> *To:* bldg-sim at onebuilding.org
> *Subject:* [Bldg-sim] Process Loads?
>
>
>
> Hi All,
>
>
>
> According to the LEED NC v2.2 user manual, the default process energy cost
> is 25% of the total energy cost for the baseline building.
>
>
>
> Example:
>
> The total energy cost for a baseline building is T = (X + *Process loads*)
>
>
> Let's assume that X = $1000.00 = 75% * T
>
>
>
> To find the energy cost for a baseline building, we solve for T
>
> Therefore T = $ 1000.00 / 75% = $ 1333.33
>
> and the Process loads' cost = 25 % * $ 1333.33 = $ 333.33
>
> This is how I understand the 25% process load calculation.
>
>
>
> Can someone please confirm this approach?
>
>
>
> Thank you,
>
>
>
> Anis
>
>
>
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