Heat pump type air conditioning systems

Claim 2

A heat pump comprising a refrigerant compressor, reversal means, a gas tube, indoor heat exchange means, means providing resistance to the flow of refrigerant, outdoor heat exchange means, and a suction gas tube connected in series in the order named, means for feeding a portion of the refrigerant liquid leaving said indoor heat exchanger back to the inlet thereof, and means for heating the refrigerant liquid before entering said indoor heat exchanger.

Claim 3

A heat pump according to claim 1, in which receiver means is provided for storing the refrigerant liquid flowing from said indoor heat exchanger, and in which by-pass means is provided for feeding refrigerant liquid from said receiver into said gas tube.

Claim 4

A heat pump according to claim 1, in which said heating means is provided in said by-pass means for heating the refrigerant liquid before entering said gas tube.

Claim 5

A heat pump according to claim 1, in which said heating means is provided in said gas tube for heating the refrigerant liquid after being mixed with discharge gas flowing from Said compressor.

Claim 6

A heat pump according to claim 1, in which a liquid pump is provided in said by-pass means for supplying refrigerant liquid from said receiver to said gas tube.

Claim 7

A heat pump according to claim 1, in which control valve means is provided in said by-pass means for shutting off the flow of refrigerant therethrough except during increased heating load.

Claim 8

A heat pump according to claim 1, in which ejector means is provided in said gas tube for ejecting the refrigerant liquid flowing from said receiver means into the refrigerant gas flowing from said compressor.

Claim 9

A heat pump according to claim 3, in which said heating means comprises: a reservoir; a heat accumulating medium stored in said reservoir; a heat exchanger coil extending within said reservoir in heat exchange contact with said heat accumulating medium; and an electric heater provided in said reservoir to heat said heat accumulating medium.

Claim 10

A heat pump according to claim 3, in which said heating means comprises: an electric heater provided in said by-pass means.

Claim 11

A heat pump according to claim 3, in which said heating means comprises: burner means provided in said by-pass means.

Claim 12

A heat pump according to claim 4, in which said heating means comprises: an electric heater provided in said gas tube.

Claim 13

A heat pump comprising a refrigerant compressor, reversal means, a discharge gas tube connecting said means to the discharge side of said compressor, an indoor coil, a second tube connecting said means to said indoor coil, receiver means, a third tube connecting said indoor coil to said receiver means, an expansion valve, an outdoor coil, a fifth tube connecting said expansion valve to said outdoor coil, a sixth tube connecting said outdoor coil to said reversal means, accumulator means, a seventh tube connecting said reversal means to said accumulator means, a suction gas tube connecting said accumulator means to the suction side of said compressor, by-pass means for feeding refrigerant from said receiver means into said second tube, a second valve for controlling the flow of refrigerant through said by-pass means and means for heating the refrigerant flowing from said receiver means, said reversal means in heating position routing discharge gas through said second tube into said indoor coil operating as a condenser coil, and routing refrigerant from said outdoor coil operating as an evaporator coil through said sixth and seventh tubes into said accumulator means, said reversal means in cooling position routing discharge gas through said sixth tube into said outdoor coil operating as a condenser coil, and routing refrigerant from said indoor coil operating as an evaporator coil through said second and seventh tubes into said accumulator means, said second valve being closed during cooling operation, said reversal means in defrosting position routing discharge gas through said sixth tube into said outdoor coil operating as a condenser coil, and routing refrigerant from said heating means through said second and seventh tubes into said accumulator means, said second valve being opened during defrosting operation.

Claim 14

A heat pump comprising a refrigerant compressor, reversal means, a discharge gas tube connecting said means to the discharge side of said compressor, an indoor coil, a second tube connecting said means to said indoor coil, receiver means, a third tube connecting said indoor coil to said receiver means, an expansion valve, an outdoor coil, a fifth tube connecting said expansion valve to said outdoor coil, a sixth tube connecting said outdoor coil to said reversal means, accumulator means, a seventh tube connecting said reversal means to said accumulator means, a suction gas tube connecting said accumulator means to the suction side of said compressor, by-pass means for feeding refrigerant from said receiver means into said second tube, a second valve for controlling the flow of refrigerant through said by-pass means and means for heating the refrigerant flowing from said receiver means, said reversal means in heating position routing discharge gas through said second tube into said indoor coil operating as a condenser coil, and routing refrigerant from said outdoor coil operating as an evaporator coil through said sixth and seventh tubes into said accumulator means, said reversal means in cooling position routing discharge gas through said sixth tube into said outdoor coil operating as a condenser coil, and routing refrigerant from said indoor coil operating as an evaporator coil through said second and seventh tubes into said accumulator means, said second valve being closed during cooling operation, said reversal means in defrosting position routing discharge gas through said sixth tube into said outdoor coil operating as a condenser coil, and routing refrigerant from said heating means through said second and seventh tubes into said accumulator means, said second valve being opened during defrosting operation.

Claim 15

A heat pump according to claim 12, in which ejector means is provided in said second tube for ejecting the refrigerant flowing through said by-pass means into the refrigerant gas flowing from said reversal means.

Claim 16

A heat pump according to claim 12, in which said heating means is provided in said second tube downstream of said ejector means.

Claim 17

A heat pump according to claim 12, in which said heating means is provided in said by-pass means upstream of said ejector means.

Claim 18

A heat pump comprising a refrigerant compressor, reversal means, a discharge gas tube connecting said means to the discharge side of said compressor, a first indoor coil, a second tube connecting said means to said first indoor coil, a first valve, a third tube connecting said first indoor coil to said first valve, a second indoor coil, a fourth tube connecting said first valve to said second indoor coil, a second valve, a fifth tube connecting said second indoor coil to said second valve, receiver means, a seventh tube connecting said second valve to said receiver means, an expansion valve, a eighth tube connecting said receiver means to said expansion valve, an outdoor coil, a ninth tube connecting said expansion valve to said outdoor coil, a tenth tube connecting said outdoor coil to said reversal means, accumulator means, an eleventh tube connecting said reversal means to said accumulator means, a suction gas tube connecting said accumulator means to the suction side of said compressor, by-pass means for feeding refrigerant from said receiver means into said second tube, a third valve for controlling the flow of refrigerant through said by-pass means, means for heating the refrigerant flowing from said receiver means, a fourth valve for controlling communication between said fourth and seventh tubes, a first capillary tube connecting said third and fifth tubes, and a second capillary tube connecting said fifth and seventh tubes, and fifth valve interconnecting said eighth and ninth tubes, said reversal means in heating position routing discharge gas through said second tube into said first indoor coil operating as a condenser coil and from said first indoor coil through said first valve and said third and fourth tubes into said second indoor coil operating as a condenser coil, and routing refrigerant from said outdoor coil operating as an evaporator coil through said tenth and eleventh tubes into said accumulator means, said fourth and fifth valves being closed during heating operation, said reversal means in cooling position routing discharge gas through said 10th tube into said outdoor coil operating as a condenser coil, and routing refrigerant from said second indoor coil operating as an evaporator coil through said first and fifth valves into said first indoor coil operating as an evaporator coil and from said first indoor coil through said second and 11th tubes into said accumulator means, said second, third and fourth valves being closed during cooling operation, said reversal means in defrosting position routing discharge gas through said tenth tube into said outdoor coil operating as a condesnser coil, and routing refrigerant from said heating means through said second and 11th tubes into said accumulator means, said third valve being opened during defrosting operation, said reversal means in dehumidifying position routing discharge gas through said tenth tube into said outdoor coil operating as a condenser coil, and routing refrigerant from said second indoor coil operating as a condenser coil through said first capillary tube into said first indoor coil operating as an evaporator coil and from said first indoor coil through said second and 11th tubes into said accumulator means, said first, second and third valves being closed during dehumidifying operation.

Claim 19

A heat pump comprising a refrigerant compressor, reversal means, a discharge gas tube connecting said means to the discharge side of said compressor, a first indoor coil, a second tube connecting said means to said first indoor coil, a first valve, a third tube connecting said first indoor coil to said first valve, a second indoor coil, a fourth tube connecting said first valve to said second indoor coil, a second valve, a fifth tube connecting said second indoor coil to said second valve, receiver means, a seventh tube connecting said second valve to said receiver means, an expansion valve, a eighth tube connecting said receiver means to said expansion valve, an outdoor coil, a ninth tube connecting said expansion valve to said outdoor coil, a tenth tube connecting said outdoor coil to said reversal means, accumulator means, an eleventh tube connecting said reversal means to said accumulator means, a suction gas tube connecting said accumulator means to the suction side of said compressor, by-pass means for feeding refrigerant from said receiver means into said second tube, a third valve for controlling the flow of refrigerant through said by-pass means, means for heating the refrigerant flowing from said receiver means, a fourth valve for controlling communication between said fourth and seventh tubes, a first capillary tube connecting said third and fifth tubes, and a second capillary tube connecting said fifth and seventh tubes, and fifth valve interconnecting said eighth and ninth tubes, said reversal means in heating position routing discharge gas through said second tube into said first indoor coil operating as a condenser coil and from said first indoor coil through said first valve and said third and fourth tubes into said second indoor coil operating as a condenser coil, and routing refrigerant from said outdoor coil operating as an evaporator coil through said tenth and eleventh tubes into said accumulator means, said fourth and fifth valves being closed during heating operation, said reversal means in cooling position routing discharge gas through said 10th tube into said outdoor coil operating as a condenser coil, and routing refrigerant from said second indoor coil operating as an evaporator coil through said first and fifth valves into said first indoor coil operating as an evaporator coil and from said first indoor coil through said second and 11th tubes into said accumulator means, said second, third and fourth valves being closed during cooling operation, said reversal means in defrosting position routing discharge gas through said tenth tube into said outdoor coil operating as a condesnser coil, and routing refrigerant from said heating means through said second and 11th tubes into said accumulator means, said third valve being opened during defrosting operation, said reversal means in dehumidifying position routing discharge gas through said tenth tube into said outdoor coil operating as a condenser coil, and routing refrigerant from said second indoor coil operating as a condenser coil through said first capillary tube into said first indoor coil operating as an evaporator coil and from said first indoor coil through said second and 11th tubes into said accumulator means, said first, second and third valves being closed during dehumidifying operation.