Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
I just came across this question by accident. As you are aware, BEopt cannot currently model a GAHP, which really goes back to EnergyPlus' lack to ability to model such systems. In fact, there is still no way of modeling air-to-water heat pumps in EnergyPlus (which is likely a system you are trying to model).
The best way of doing it right is with user defined component models and EMS. This is an approach I have used to date. There's a short description of in this paper: https://www.techstreet.com/standards/at-19-c032-demonstration-and-simulation-of-gas-heat-pump-driven-residential-combination-space-and-water-heating-system-performance?product_id=2033994
You'd want to use a defined plant component as your GAHP. If you have performance data/curves, you'd then have to write an EMS program to define how this GAHP will perform at different conditions. If you look at the EMS examples included in the EnergyPlus documentation, the example for a user defined plant component would be highly relevant.
Based on the work described in the above paper, we are working on a more detailed publications. We're also hoping to implement some updates to EnergyPlus, but that won't happen until some time in 2021.
