Dear All,

I am intending to model a building on campus which is connected to a campus energy system providing chilled water and hot water. As I would like to achieve more points and I know the properties of the district energy systems, I am opting for Option 2.

I read the USGBC's guidance and modeled a virtual DES system for my proposed model. Now for the efficiencies, the guidance has conservative low values (heating efficiency of 70% and Cooling COP 4.4).

I know that the installed DES boilers have an efficiency of 82% and the installed DES Chillers have a COP of 6.1.

Can I simply use these efficiencies in my proposed model, or I have to account for the DES's part-load efficiencies? If so, then can I approximate the building's load to determine the corresponding efficiency from the part-load curves?
The current DES is supplying 3 buildings, and my new project has 2 new buildings to be constructed, so can I roughly obtain the efficiencies at half load (or say at 40% of the full load)?

Thanks!