one ground source heat pump for air handling:
*ground side use plate heat exchanger
*air side use fin coil heat exchanger
*Summer day--fin coil as evaporator to dehumidify air ,condensing heat reject by ground side plate heat exchange
* winter day--heating air by fin coil condensing heat

The main concern is how to control condensing heat in winter by the most economic way. Air volume is required by customer and not allowed to adjust. Compressor is fixed volume. I'm not sure if the hot gas bypass can apply for this situation? or adjust underground side water flow?
thx in advance

rgds
LC