My client is hiring only a small portion of the existing building, which is not LEED certified, and we are using the common central chiller of that building, but we have our own AHU, we have also installed VAV's for all individual spaces within our space.
Now for achieving the EAc1.3; When we opt the Option2, with Energy Cost Budget method, What do we need to model for the Design and the Baseline case?
We only have detail information about the tenant space and the whole building envelope, but not the whole building's air side, occupancy, lighting and plug loads etc.
Paul Conrad
Energy EngineerCLEAResult Consulting
346 thumbs up
November 30, 2010 - 8:00 am
You only need to model your portion of the building, not the entire thing. You can model it as a "virtual" building, that is to say, as though your portion of the building is all that exists. Use ASHRAE 90.1 Appendix G as your reference to build up the baseline. I would use the whole building numbers to choose the correct HVAC System (ergo if your space is 50,000 sq ft but the whole building is 250,000 sq ft, use 250,000 to find the correct HVAC System). Once that's complete model your space as it actually exists and use the actual HVAC system from the building. Compare the two in the EAc1.3 form and you should be good.
Santhosh Manavalan
18 thumbs up
November 30, 2010 - 11:16 pm
Dear Paul, Thanks for your reply, but in Option2 (comparison with ASHRAE) its stated that
"The simulation should generally involve more than just the project space and model the building segment that is served by the common HVAC system. For example if the project area takes up the third floor of a 5-story building and the building has a single central plant, the entire building should be modeled."
Pl clarify this. Thanks again.
Paul Conrad
Energy EngineerCLEAResult Consulting
346 thumbs up
December 8, 2010 - 10:07 am
I apologize Santhosh, I didn't see that you'd responded.
The answer is "it depends". You need to be able to isolate your portion of the building from the rest. There are methodologies for doing so, but depending on your software, it can be more or less difficult. In eQUEST, for example, you can manually set up individual electric meters and then indicate which meters you want to report on, but to do so, you must be in detailed edit mode and know the in's and out's of the software.
Conversely, if you include in your narrative why you only modeled your portion of the building, a reviewer is much more likely to accept your project.
Hope this helps,
Paul