Hi to all,
I am working on an energy model with a large number of showers. It is expected about 8953152 liters/year of hot water demand at 60C.
My proposed building has a condenser heat recovery system from the chillers, which is expected to provide a constant inlet water temperature of about 45C (this building requires cooling even during winter time).
The water is then heated to 60C with a heat pump with a 4.7 SCOP. I assume than these is a renewable energy system.
However, I am very confuse about the baseline system selection. As per ASHRAE 90.1 appendix G the energy source should be the same as proposed, in this case electricity. Thus, my baseline SHW system would be an electric water heater ("where the energy source is electricity, the heating method shall be electrical resistance), how can I size my baseline system in order to assign the corresponding performance based on the size category (>12KW, <12KW)? in the case of a system with > 12kW, what is the efficiency? 1? I find this very confusing in the standard, I would be grateful if someone could clarify it.
Thanks
