SYSTEM and EQUIPAMENT CAPACITY for LEED
I am modeling a building to submit to LEED certification and I have a concern regard to the baseline HVAC system and the increment of 15% applied to the Equipment Capacity.
First, regarding to the baseline HVAC system, I am using two chillers and fan coils to met the thermal load of the proposed model. Considering that my building has three floors, I choose the system 4, as presented in the picture below.
To represent this system in EnergyPlus, I set the following system in OpenStudio (Packaged Rooftop Heat Pump).
Is it the right representation of the system 4 (appendix G- Table G.3.1.1B)?
Second, Should I Set the 15 % for both models, baseline and proposed model, or only apply this coeficient for the baseline model.
I have a couple of questions about your baseline HVAC choice. There are a few details you didn't add to your question which are important when choosing the baseline system. 1. What fuel are you using for the heating in your design case, if you are using any fossil fuels at all? Then you can not use system 4, it would be system 3. 2. What is the total floor area of your building? If it is more than 2,300 sqm then even if it has 3 floors it would be system 5 or 6. Otherwise the system set up looks ok.
I am using eletricity and the the total area of the building is 2732 m².
In that case I think you should be using system 6, system 4 is for buildings less than 2 300 sqm. System 6 uses 1 AHU VAV system per floor with PFP boxes in each zone.