I am having a hard time determining what type of system I should be modeling for my building in both the Proposed AND the Baseline.
Here is the deal:
The building is a Fire Station that is about 8000 sf total. 5000 sf is served by a geothermal heat pump system (heating fuel = electricity), while 3000 sf is served by heating only infrared heaters. (heating fuel = gas)
I know I need to model a cooling system in the proposed case for the space with the infrared heaters even though we don't have one. I also know it needs to be the same cooling system for the proposed case as the baseline case.
So, what is the baseline system? Do I model for electric heat throughout the building even though I have gas and electric in my proposed? (since electric is the main system?) If so, my baseline system is a packaged heat pump rooftop unit.
If I am correct in selecting the baseline system, how do I model that heating only space? I almost need to have (2) systems for one space, but I don't know how to assign a single room to two different systems. I am using Trace 700 for my energy model.
Anyone have a good idea for me?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5868 thumbs up
August 9, 2010 - 5:15 pm
The proposed is easy - model what you are building.
The baseline looks like it should be System 4. See the note under Table G3.1.1A - "Where attributes make a building eligible for more than one baseline system type, use the predominant condition to determine the system type for the entire building."
Model the heating only space in the baseline with System 4, no need for a second system.
While you do need to model a cooling system for the uncooled area you can simply set the temperatures in that space during the cooling season to ensure that the system does not operate. Make sure the temperature settings are the same in both models.