Ground source heat pump system

F - Mech Eng,Light,Heat,Weapons – 25 – B

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F25B 30/02 (2006.01) F24J 3/08 (2006.01) F25B 13/00 (2006.01) F25B 30/06 (2006.01) F25B 41/00 (2006.01) F25B 40/04 (2006.01) F25B 41/04 (2006.01) F25B 49/02 (2006.01)

Patent

CA 2128178

A ground source heat pump system including an indoor fan coil, a high torque compressor, a thermostatic expansion valve (TXV), a suction gas distributor, an accumulator with an internal heat exchanger and an arrangement of check valves to permit a single direction of refrigerant flow in both the heating and cooling modes. Only one TX valve is required providing simplicity for the system. A backflooding control valve is used in the system to control condenser pressures to assure proper refrigerant quantity and pressure at the TX valve. The heat pump also uses a head pressure control valve to maintain a pre-set refrigerant pressure in the ground coil on air conditioning mode. The system charge is the same for heating and cooling and the ground coil consists of a plurality of three pipe units - one pipe for inflow and two for out flow.

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