Abstract: A heat pump system using air as its heat source is disclosed. In this system, the refrigeration circuit consists of both a main refrigerant line and a refrigerant suction line. A heat accumulator, containing both a heat medium and a heat storage phase change material, is mounted on the refrigerant line at a position between the cooling mode and heating mode expansion valves. A heat-dissipating heat exchanger is mounted on the main refrigerant line, and is set in the accumulator. A subsidiary heat exchanger is installed around the inlet port of the outdoor heat exchanger, and is connected to the heat accumulator through heat medium lines with a circulating pump. The system also has a heat pipe consisting of both an evaporating part installed at the periphery of the heat-dissipating heat exchanger, and a heat dissipating part installed at the periphery of the heat accumulator and connected to the evaporating part through a connection pipe.

Abstract: A heat pump apparatus, improved in the operational reliability of its compressor and maintaining its COP at a desired level, is disclosed. The basic refrigeration circuit of the apparatus consists of a first pipe extending from a compressor to a four-way valve, second and third pipes sequentially connecting the four-way valve, an indoor heat exchanger, a cooling-mode expansion valve, a heating-mode expansion valve and an outdoor heat exchanger to each other, and a fourth pipe extending from the outdoor heat exchanger to the four-way valve. A refrigerant suction line extends from the four-way valve to the compressor. A main bypass line extends from the third pipe at a position between the two expansion valves to the refrigerant suction line, with a liquid refrigerant tank installed on the bypass line. A pressure control valve and a solenoid valve are installed on the bypass line at positions around the inlet and outlet ports of the liquid refrigerant tank, respectively.

Abstract: A heat pump system using air as its heat source is disclosed. In this system, the refrigeration circuit consists of both a main refrigerant line and a refrigerant suction line. A heat accumulator, containing both a heat medium and a heat storage phase change material, is mounted on the refrigerant line at a position between the cooling mode and heating mode expansion valves. A heat-dissipating heat exchanger is mounted on the main refrigerant line, and is set in the accumulator. A subsidiary heat exchanger is installed around the inlet port of the outdoor heat exchanger, and is connected to the heat accumulator through heat medium lines with a circulating pump. The system also has a heat pipe consisting of both an evaporating part installed at the periphery of the heat-dissipating heat exchanger, and a heat dissipating part installed at the periphery of the heat accumulator and connected to the evaporating part through a connection pipe.

Abstract: There is disclosed a heat pump type air conditioning apparatus including the construction of a general heat pump type air conditioning apparatus constructed in such a way that a compressor, a four-way valve, an indoor heat exchanger, a pressure reducer for a room cooling operation, another pressure reducer for a room heating operation, an outdoor heat exchanger and the four-way valve are connected one after another by means of a conduit, and the compressor is connected to the four-way valve by means of a suction conduit. The air conditioning apparatus of the present invention is characterized in that two points on the portion of the conduit between the compressor and the four-way valve are connected by means of a bypass. A first heat exchanger is disposed on the bypass. A water heating circuit is provided. A second heat exchanger is disposed on one side of the water heating circuit while being in a heat exchange relation with the first heat exchanger.

Abstract: Disclosed herein is a heat pump system. The heat pump system includes a base heat pump system constructed in such a way that a compressor, a four-way valve, a first heat exchanger, two expansion valves, a second heat exchanger and the four-way valve are sequentially connected to each other by first, second, third, fourth, fifth and sixth conduits. An additional heat exchanger is disposed on an eighth conduit, the eighth conduit connecting a seventh conduit, connected to the fourth conduit at its both ends, to the portion of the fourth conduit situated between two junction points of the fourth and seventh conduits.

Abstract: A heat pump type air conditioning apparatus is disclosed. The air conditioning apparatus comprises a heat pump and a heat piping. The heat pump includes a compressor, a four-way valve, an indoor heat exchanger, a pressure reducer for a room cooling operation, another pressure reducer for a room heating operation and an outdoor heat exchanger. The compressor, the four-way valve, the indoor heat exchanger, the pressure reducer for a room cooling operation, the pressure reducer for a room heating operation, the outdoor heat exchanger and the four-way valve are connected one after another in series by means of a first conduit. The four-way valve is additionally connected to the compressor by means of a suction conduit. Two points on a portion of the first conduit directly connecting the outdoor heat exchanger to the four-way valve are additionally connected to each other by means of a second conduit.

Abstract: A drying apparatus is disclosed. The drying apparatus comprises a drying housing, a heat pump unit and a heat pump piping. The interior of the drying housing is divided into a drying chamber and a circulation passage by a partition wall. The circulation passage is divided into upper and lower passages by a partition plate. Dampers are respectively mounted on the partition plate and the upper and lower portions of the outside wall of the circulation passage, and a heated air inlet and an air outlet are respectively formed on the upper and lower portions of the partition wall. The heat pump unit is disposed with its condenser situated in the heated air inlet and its evaporator situated in the atmosphere. The heat piping is disposed with its condensing portion situated in front of the sucking side of the evaporator and its evaporating portion situated in front of the heated air outlet in the drying chamber.

Abstract: A combined drying and refrigerating storehouse is disclosed. The storehouse comprises a housing, circulation passages, a heat pump unit, a second evaporator, flow passage control means and a control unit. The housing has a heat pump unit chamber and two combined drying and refrigerating chambers. The heat pump unit chamber is divided from the combined drying and refrigerating chambers by two partition walls. The circulating chambers are extended outwardly from the partition walls and extended vertically. The heat pump unit has a compressor, a four-way valve, first and second heat exchangers and a second condenser. The compressor, the fourway valve, the first heat exchanger, the second condenser, the second heat exchanger and the compressor are connected one after another by means of a first conduit. The outlet of the four-way valve is connected to the inlet of the compressor by means of a suction conduit. The second evaporator is disposed on a portion of a second conduit.

Abstract: A heat pump type air conditioning apparatus is disclosed. In the apparatus, a first heat exchanger is mounted to a refrigerant conduit at a position between an indoor heat exchanger and a heater-mode capillary tube. A second heat exchanger is mounted to the conduit at a position between an outdoor heat exchanger and a four way valve while being positioned higher than the first heat exchanger. The first and second heat exchangers are filled with actuation fluid and vaporize both remaining liquid refrigerant and incompletely vaporized gaseous refrigerant from the outdoor heat exchanger using the actuation fluid vaporized by liquid refrigerant from the indoor heat exchanger. In another embodiment, an auxiliary heating unit is connected to the first heat exchanger and is operated when the temperature of atmospheric air is exceedingly low in days of cold weather. In the auxiliary heating unit, a third heat exchanger is mounted to the first heat exchanger.