PRM Navigator - DES for LEED

[enerGwizz]

So, when you have a LEED building that's served by a "district energy system" (i.e. central plant outside the project scope), energy modeling must follow the USGBC document called "Treatment of District or Campus Thermal Energy in LEED V2 and LEED 2009 - Design & Construction," last issued August 13, 2010.

In this guideline, the options are to model the plant utility as "cost neutral" or to actual model the plant and compare to a current energy code baseline plant. Going with the cost neutral route, the guide says to meter the chilled water, hot water, steam, or whatever utility you're using from the campus plant and calculate cost by $ per unit of energy.

I've been playing with the tariff's from the navigator, and it doesn't appear like you can define a rate like this. Has anybody run into this?

What I've done before is to use the default plant efficiencies given elsewhere in the guide to define a generic chiller plant that is used in both baseline and proposed models to serve the ApHVAC systems. This was accepted by GBCI on another project because that software didn't accommodate separate metering of chilled water use.