District heating and cooling are terms associated with the HVAC system of a building when it receives cooling and/or heating from a centralized source (eg. chilled water from a Chiller Plant which serves multiple buildings and steam from a Combined Heat and Power Plant)
- Yes, depending on the way you have set up your HVAC system, if all your thermal zones are served by the district heating system, then it includes heating for all three zones. As for the water heating (assuming you are talking about the service hot water loop), you can have it connected to the district heating.
- Unless you have multiple district cooling loops, the Cooling:DistrictCooling and District Cooling:Facility should have the same kBtu values.
- Heating load is basically the rate at which sensible and/or latent heat must be added to the space to maintain a constant space air temperature and humidity.
