Activity tab in model data
In DesignBuilder the amount of DHW consumed is considered to be a function of the activity in the zone. For example, there is a demand assumed to arise from the occupants of an office for activities such as washing hands and washing up cups. This demand is associated with the office rather than the toilet or tea room. Thus the demand from each space needs to be assigned to a DHW system even if the system itself is not present in the space.
The effect of hot water consumption (hot water taps, showers etc) on building energy use can be included in your thermal model by switching on DHW on the HVAC tab.
The data on this tab defines the hot water consumption rate in each zone as l/day/m2 data (gal/day/ft in IP units). The DHW consumption data is only used if DHW is selected on the HVAC tab.
Note: Convert l/person/day DHW consumption data to the DesignBuilder format by multiplying it by occupant density (people/m2).
With Simple and Compact HVAC, the hot water generation system is defined under DHW on the HVAC tab.
Note: This DHW consumption data is also used in Detailed HVAC with the default 1-Simple HVAC Detailed HVAC Activity data setting.