[hacknslash]

I was looking at the basic heat pump flow. What I'm understanding:
Vapor temperature returning to the compressor is at ~45 deg F after absorbing heat from the Ground Loop.
Compression raises the temp to about 135 deg F and the hydronic floor loop pulls the heat out and drops it to about 90 deg.
Vapor has probably condensed or is doing so as it cools waiting to run through the expansion valve where it dramatically drops in temperature to something like ~-35.
Then back to the Geothermal ground loop exchanger.

I think the whole idea behind geothermal is to get a better lift in the vapor temperature returning to the compressor than what you would see with air-source during the winter season. Is there a reason we can't do some of that lifting from transferring the heat from the condensing vapor in the condensor to the vapor returning to the compressor before all that heat is lost at the expansion valve? The values in the sketch are for indication only and not of actual performance.

My project would only require a heat pump in heating mode and no cooling.

Downsides I can think of:
There would be additional cost in heat exchangers.
Over-heat the compressor?

HacknSlash