Update rc_model_SIA.py
Update rc_model_SIA.py

- account for internal loads of light and appliance with factor (f = Hs/Es)
- account for soler heat gains with factor (f = sqrt(Hs))

architecture-building-systems/CityEnergyAnalyst,architecture-building-systems/CityEnergyAnalyst,architecture-building-systems/CityEnergyAnalyst