In OpenStudio, if I want to model a wall-mounted AC unit, should I treat it as a heatpump? If so, will the autosize feature get me close enough for an estimate, or do I need to reduce it by some factor?
If it can provide heating, then yes, if not then just model it as a packaged terminal device with a cooling coil and fan. If you're looking at OpenStudio default objects PTHP has a cooling and heating coil whereas PTAC just has a cooling coil. However, the default curves for the cooling coils are different in each of them.
Thank you, I will try that. However, it will be treated as a cooling load in the analysis the program outputs, and not labeled as a plug-load, correct? In which case, we will need to do a little assuaging of the data to more correctly label what load as plug-load and not as a dedicated HVAC system.
Should I expect there to be significantly less efficiency associated with the wall-mounted AC plug-in unit? And if so, something I will no doubt need to edit in its properties before I run the simulation.
Efficiency depends on the unit. I've seen them up to 18 SEER for heat pumps, which is quite good, I'm sure you could find even higher though.
Comments
@mcdonaa1, please use existing tags, e.g., 'heat-pump' as opposed to creating new tags.