This may be a dumb question, go ahead and slam me if it is.
I'm thinking of different ways to boost the water temp of a geo system, increasing capacity as a result.
Say I had glycol circulating through a solar panel on the roof, and down through the desuperheater connections on the heatpump. How hot would the glycol running through the HWG coil have to be in order to boost the refrigerant temp enough to see a benefit to the system? Retrofitting this on an existing system would be easier than opening up the ground loop to add in a heat exchanger. Would this even work?
Of course, the system would be disabled in cooling mode, and the solar used to heat domestic water or a hot tub or something. And controls would be set-up to keep the solar loop shut down when glycol is too cold.