Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Greetings,
I'm a designbuilder user and I model split systems by using the PTHP object.
I'm assuming that the ventilation in the building or room is balanced (outdoor air supply = bathroom exhaust).
To model this, add a generic air loop and connect the supply and extract to the zone.
add a zone exhaust fan to the zone. Set the appropriate inputs in the air loop and the zone exhaust fan so that they balance and all supplied ventilation air is exhausted through the bathroom (zone exhaust fan). the zone exhaust will ensure that no air flows through the extract.
You can control the ventilation supply air by setting the ventilation outside air definition method 2-per person, then set the outdoor air ADU control per person ventilation rate mode to 1-current occupancy. then set the zone exhaust fan flow fraction schedule to the same occupancy schedule as the zone.
In summary: add zone group add PTHP add outdoor air ADU, set to current occupancy add extract add zone exhaust fan, apply flow fraction and occupancy schedule add generic air loop with AHU
| | 2 | No.2 Revision |
Greetings,
I'm a designbuilder user and I model split systems by using the PTHP object.
I'm assuming that the ventilation in the building or room is balanced (outdoor air supply = bathroom exhaust).
To model this, add a generic air loop and connect the supply and extract to the zone.
add a zone exhaust fan to the zone. Set the appropriate inputs in the air loop and the zone exhaust fan so that they balance and all supplied ventilation air is exhausted through the bathroom (zone exhaust fan). the zone exhaust will ensure that no air flows through the extract.
You can control the ventilation supply air by setting the ventilation outside air definition method 2-per person, then set the outdoor air ADU control per person ventilation rate mode to 1-current occupancy. then set the zone exhaust fan flow fraction schedule to the same occupancy schedule as the zone.
In summary:
add zone group
add PTHP
summary:
