Today I installed the Brine heat Exchanger in the intake Air of the HRV

Temperature inside house after Air passed through ground loop +9.1Celsius

After Brine loop heat exchanger +12.7 celsius

Measuring the intake Air of the Ground loop at -11.7 outside and + 9.1 inside  after going through the heat exchanger a further increase to + 12.7 Celsius this makes a difference of 24.4  degrees Celsius of free heat from the ground.

Temperature at outside Air intake