Hello Modeling Community,
I have set up a small building model (<2300m2) with zones for each of the interior rooms. After setting up the geometry I wanted to configure a baseline following ASHRAE 90.1-2010, which recommends a Packaged Rooftop Heat Pump system. I set up a Packaged Rooftop Heat Pump system in OpenStudio, replacing the SingleZone setpoint manager with a Scheduled:DualSetpoint manager. After a lot of head scratching and model iterations I discovered that the EnergyPlus documentation for the HVACTemplate:System:UnitaryHeatPump:AirToAir states:
This system may serve one or more HVACTemplate:Zone:Unitary objects. If this system serves more than one zone, only one zone is specified as the control zone.
Which may explain why my system was not properly autosizing for the entire building.
So my questions are:
- How do I setup a packaged rooftop heat pump system for a multizone building?
- Can I use the packaged rooftop heat pump system as a preheater/precooler and at the zone level use heating and cooling diffusers? Does this still follow ASHRAE 90.1-2010?
- Is it possible to autosize a packaged rooftop heat pump system for a building with multiple zones?
- Are there alternative systems I could consider for a baseline?
Thank you for your time,
Justin
