Heat pump system for optimizing operational efficiencywithout charge imbalance and a method thereof

An outdoor HVAC unit comprising:

• a compressor;
• an outdoor coil in communication with an indoor HVAC unit and the compressor, the outdoor coil comprising:
• a plurality of fluid circuits;
• at least one charge storage circuit;
• and
• an expansion valve located between the at least one charge storage circuit and the plurality of fluid circuits,
• wherein, during a cooling mode, the liquid refrigerant flows into the indoor HVAC unit and the at least one charge storage circuit functions as a subcooling circuit, and
• wherein, during a heating mode, the at least one charge storage circuit contains liquid refrigerant.

A method for optimizing operational efficiency of a heat pump system without charge imbalance, the method comprising:

• operating the heat pump system, in at least one of a heating mode and a cooling mode, the heat pump system comprising:
• an indoor HVAC unit comprising an indoor coil;
• and
• an outdoor HVAC unit in communication with the indoor HVAC unit, the outdoor HVAC unit comprising:
• a compressor in communication with a reversing valve;
• and
• an outdoor coil in communication with the indoor HVAC unit and the compressor, the outdoor coil comprising at least one charge storage circuit;
• supplying liquid refrigerant into the indoor HVAC unit during the cooling mode;
• configuring the at least one charge storage circuit to function as a subcooling circuit during the cooling mode;
• and
• configuring the at least one charge storage circuit to contain liquid refrigerant during the heating mode.