Heat pump coil circuit

A spirally wound spine fin outdoor heat exchanger coil for use in a reverse cycle refrigeration system including a motor compressor, an indoor heat exchanger, a valve for reversing the flow of refrigerant through said system to operate said system in a cooling defrost mode or a heating mode with each of said heat exchangers arranged interchangeably as a condenser or as an evaporator said outdoor heat exchanger comprising:

• a central portion including a plurality of spirally wound substantially vertically disposed central circuits of spine fin heat exchange tubing, each of said circuits defining a single continuous passageway between a first opening connected to said reversing valve and a second opening connected to the system liquid line;
• a split circuit including a lower circuit arranged below said vertically disposed central circuits and an upper circuit arranged above said vertically disposed central circuits, means interconnecting said lower and upper circuits in series refrigerant flow to define a single continuous passageway between a first opening in said lower section and a second opening in the upper circuit of said split circuit;
• conduit means including a first refrigerant line connecting said first opening in said lower circuit of said split circuit to the system reversing valve and a second refrigerant line connecting said second opening to the system liquid line whereby a portion of relatively warm gaseous refrigerant is fed from said compressor through said reversing valve directly to said lower circuit of said split circuit through said first opening when the system is in the defrost mode, and for directing a portion of liquid refrigerant from said system liquid line directly to said upper circuit of said split circuit through said second opening when the system is in the heating mode.

An outdoor heat exchange apparatus adapted for use in a reverse cycle refrigeration system including a motor compressor, an indoor heat exchanger, a valve for reversing the flow of refrigerant through said system to operate said system in a cooling defrost mode or a heating mode with each of the heat exchangers arranged interchangeably as a condenser or as an evaporator, said outdoor heat exchange apparatus comprising:

• a housing including a base drain member, side walls having air intake openings and a top wall having discharge openings;
• fan means arranged in said housing for directing outdoor ambient air between said air intake and discharge openings;
• a heat exchange tubing having its lowest pass arranged adjacent said base pan member extending vertically substantially parallel to said side wall intake openings so as to be in the path of air passing between said intake and discharge openings;
• a central portion of said heat exchange tubing including a plurality of substantially vertically disposed central circuits of heat exchange tubing, each of said circuits defining a single continuous passageway between first opening connected to said reversing valve and second opening connected to the system liquid line;
• a split circuit of said heat exchange tubing including a lower circuit arranged below said vertically disposed central circuits and an upper circuit arranged above said vertically disposed central circuits, means interconnecting said lower and upper circuits in series refrigerant flow to define a single continuous passageway between a first opening in said lower section and a second opening in the upper circuit of said split circuit;
• conduit means including a first refrigerant line connecting said first opening in said lower circuit of said split circuit to the system reversing valve and a second refrigerant line connecting said second opening to the system liquid line whereby a portion of relatively warm gaseous refrigerant is fed from said compressor through said reversing valve directly to said lower circuit of said split circuit through said first opening when the system is in the defrost mode, and for directing a portion of liquid refrigerant from said system liquid line directly to said upper circuit of said split circuit through said second opening when the system is in the heating mode.

An outdoor heat exchange apparatus adapted for use in a reverse cycle refrigeration system including a motor compressor, an indoor heat exchanger, a valve for reversing the flow of refrigerant through said system to operate said system in a cooling defrost mode or a heating mode with each of the heat exchangers arranged interchangeably as a condenser or as an evaporator, said outdoor heat exchanger apparatus comprising:

• a housing including a base drain member, said walls having air intake openings and a top wall having discharge openings;
• fan means arranged in said housing for directing outdoor ambient air between said air intake and discharge openings;
• a spirally wound single pass spine fin heat exchange tubing having its lowest pass arranged adjacent said base pan member extending vertically substantially parallel to said side wall intake openings so as to be in the path of air passing between said intake and discharge openings;
• a central portion of said spirally wound heat exchange tubing including a plurality of spirally wound substantially vertically disposed central circuits of spine fin heat exchange tubing, each of said circuits defining a single continuous passageway between first opening connected to said reversing valve and second opening connected to the system liquid line;
• a split circuit of said spirally wound heat exchange tubing including a lower circuit arranged below said vertically disposed central circuits and an upper circuit arranged above said vertically disposed central circuits, means interconnecting said lower and upper circuits in series refrigerant flow to define a single continuous passageway between a first opening in said lower section and a second opening in the upper circuit of said split circuit;
• conduit means including a first refrigerant line connecting said first opening in said lower circuit of said split circuit to the system reversing valve and a second refrigerant line connecting said second opening to the system liquid line whereby a portion of relatively warm gaseous refrigerant is fed from said compressor through said reversing valve directly to said lower circuit of said split circuit through said first opening when the system is in the defrost mode, and for directing a portion of liquid refrigerant from said system liquid line directly to said upper circuit of said split circuit through said second opening when the system is in the heating mode.