Abstract: A refrigeration cycle apparatus includes a refrigeration circuit including a compressor, an outdoor heat exchanger, an indoor heat exchanger, and an expansion valve, refrigerant is enclosed in the refrigeration circuit, the refrigerant contains three components R1234yf, HFO1123, and R290, a composition diagram is represented by triangular coordinates includes: a point A representing R1234yf/HFO1123/R290=100/0/0% by mass, a point B representing R1234yf/HFO1123/R290=85/0/15% by mass, a point C representing R1234yf/HFO1123/R290=20/80/0% by mass, and a point D representing R1234yf/HFO1123/R290=6.2/78.8/15% by mass, the mass ratio between the three components falls in a first range enclosed by a straight line 1 connecting the point A to the point B, a straight line 2 connecting the point A to the point C, a straight line 3 connecting the point B to the point D, and a curve 1 connecting the point C to the point D.

Abstract: Refrigerant is sealed in a refrigeration circuit. Refrigerant contains a first component and a second component. The first component consists of 1,1,2-trifluoroethylene. The second component consists of at least one selected from the group consisting of hydrocarbon having a carbon number not smaller than 1 and not larger than 5 and fluorinated hydrocarbon having a carbon number not smaller than 1 and not larger than 5. A content C1 based on a mass of the first component in refrigerant is not lower than 50 mass %. A percentage (C2/C1)×100 of a content C2 based on a mass of the second component to the content C1 based on the mass of the first component in refrigerant is not lower than 15% and lower than 50%. The compressor is filled with compressor oil. Compressor oil is compatible with the second component.

Abstract: Refrigerant is sealed in a refrigeration circuit. Refrigerant contains a first component and a second component. The first component consists of 1,1,2-trifluoroethylene. The second component consists of at least one selected from the group consisting of hydrocarbon having a carbon number not smaller than 1 and not larger than 5 and fluorinated hydrocarbon having a carbon number not smaller than 1 and not larger than 5. A content C1 based on a mass of the first component in refrigerant is not lower than 50 mass %. A percentage (C2/C1)×100 of a content C2 based on a mass of the second component to the content C1 based on the mass of the first component in refrigerant is not lower than 15% and lower than 50%. The compressor is filled with compressor oil. Compressor oil is incompatible with the second component.

Abstract: A refrigerant circuit includes a compressor. Refrigerant is sealed in the refrigeration circuit. Refrigerant contains 1,1,2-trifluoroethylene and propane. A content C1 based on a mass of 1,1,2-trifluoroethylene in refrigerant is not lower than 70 mass % and not higher than 85 mass %. A content C2 based on a mass of propane in refrigerant is not lower than 15 mass % and not higher than 30 mass %.

Abstract: A heat exchanger includes plate-shaped fins and a plurality of heat transfer pipes attached to the fins so as to intersect the fins. The heat transfer pipes are disposed at intervals in a long-edge direction of the fins. The fins have a wave shape at at least a portion thereof and are capable of expanding and contracting in the long-edge direction.

Abstract: A compressor 12 for use in a refrigerant circuit 11 using a refrigerating machine oil 60 being free of phosphoric ester and a refrigerant mixture inclusive of 1,1,2-trifluoroetylene includes a rolling piston 32 and a vane 33 in contact with the rolling piston 32 in a slidable manner. The rolling piston 32 and the vane 33 are formed of a base metal, the base metal being steel, and the base metal is exposed at a contact portion between the rolling piston 32 and the vane 33.

Abstract: A condenser of a refrigeration cycle apparatus includes a first passage, a second passage, and a joint. The first passage connects to the compressor at a first end and is constituted of, at a second end, a first flat heat transfer tube including a plurality of passages thereof. The second passage connects to the expansion device at a first end and is constituted of, at a second end, a second flat heat transfer tube including a plurality of passages thereof. The joint joins the first flat heat transfer tube and the second flat heat transfer tube and bends a flow of the hydrofluoroolefin-based refrigerant between the first flat heat transfer tube and the second flat heat transfer tube. A length of the second passage is equal to or shorter than a length of the first passage. The joint is provided, inside thereof, with a hollow portion.

Abstract: Provided is an outdoor unit for use in a refrigeration cycle apparatus circulating refrigerant mixture inclusive of 1,1,2-trifluoroethylene, the outdoor unit including: a casing; a pipe configured to allow the refrigerant mixture to flow through the pipe, the pipe being accommodated inside the casing and including a bend portion, the bend portion including a breakage-guide structure having a pressure resistance lower than a pressure resistance of rest of the pipe; and a plate interposed between the breakage-guide structure and outside of the casing.

Abstract: A dehumidifier includes: a housing; a refrigerant circuit configured to allow low GWP refrigerant to circulate therethrough, the refrigerant circuit including a compressor having a variable operating frequency, a condenser, a pressure reducing device, and an evaporator, which are provided in the housing, the low GWP refrigerant being flammable and having a value of GWP of 6 or less; a blowing fan, which is provided in the housing, and is configured to take in air in a room into the housing and cause the taken-in air to pass through the evaporator and the condenser before blowing out the air from the housing into the room; and a water storage tank, which is provided below the evaporator, and is configured to accumulate dew condensation water generated in the evaporator, a number of refrigerant paths passing through the evaporator being greater than a number of refrigerant paths passing through the condenser.

Abstract: A corrugated fin heat exchanger includes: a first flat tube; a second flat tube aligned in parallel with the first flat tube; and a corrugated fin disposed between the first flat tube and the second flat tube, and the corrugated fin includes a first slant portion bridging between the first flat tube and the second flat tube and inclined relative to a perpendicular line toward the first flat tube at a first angle of inclination, a second slant portion bridging between the first flat tube and the second flat tube and inclined relative to the perpendicular line at a second angle of inclination, and a third slant portion bridging between the first flat tube and the second flat tube, the third slant portion positioned between the first slant portion and the second slant portion, and inclined relative to the perpendicular line at an angle of inclination larger than both of the first angle of inclination and the second angle of inclination.

Abstract: A heat pump apparatus, including: a two-cylinder compressor including: an electric motor; two compression units to be driven by the electric motor, the two-cylinder compressor being structured to switch between two operation modes including single operation in which one of the compression units is brought into a non-compression state, and parallel operation in which both the compression units are brought into a compression state; an inverter drive control device supplying drive power to the electric motor of the two-cylinder compressor; an operation mode detecting-determining unit determining a current operation mode based on an electric signal acquired from the inverter drive control device; and a capacity control device determining a rotating frequency of the electric motor so that a temperature of a target object is brought close to a set value, to thereby control the inverter drive control device based on a result of determination of the operation mode detecting-determining unit.

Abstract: A refrigeration cycle apparatus includes refrigerant circuits in which a high pressure shell compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are connected; a mixed refrigerant made up of a mixture of 1,1,2-trifluoroethylene, difluoromethane, and 2,3,3,3-tetrafluoropropene and configured to circulate through the refrigerant circuits, the mixed refrigerant containing less than 50 wt % of 1,2,2-trifluoroetylene and a mixing ratio of difluoromethane being between 0.7 times and two times (both inclusive) that of 1,2,2-trifluoroetylene in terms of weight ratio, in a state before the mixed refrigerant is enclosed in the refrigerant circuits; and a refrigerating machine oil enclosed in the refrigerant circuits and prepared such that difluoromethane is least soluble in the refrigerating machine oil.

Abstract: A refrigeration cycle apparatus includes refrigerant circuits in which a high pressure shell compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are connected; a mixed refrigerant containing 1,1,2-trifluoroethylene and a refrigerant other than 1,1,2-trifluorothylene and circulating through the refrigerant circuits; and a refrigerating machine oil enclosed in the refrigerant circuits and adjusted such that 1,1,2-trifluoroethylene will be more soluble therein than the other refrigerant is.

Abstract: A heat exchanger includes plate-shaped fins and a plurality of heat transfer pipes attached to the fins so as to intersect the fins. The heat transfer pipes are disposed at intervals in a long-edge direction of the fins. The fins have a wave shape at at least a portion thereof and are capable of expanding and contracting in the long-edge direction.

Abstract: A refrigeration cycle apparatus includes a refrigerant circuit including a compressor, a condenser (outdoor heat exchanger), an expansion valve, and an evaporator (indoor heat exchanger), a fan configured to blow air to the condenser, a fan configured to blow air to the evaporator, and a controller configured to control at least one of a frequency of the compressor, an opening degree of the expansion valve, a rotation speed of the fan, and a rotation speed of the fan, such that the refrigerant sucked into the compressor has a quality of 1.0 or greater. The refrigerant circuit is configured for use with a refrigerant mixture inclusive of 30 wt % to 50% wt ethylene-based hydrofluorocarbon refrigerant.

Abstract: In a heat exchanger, a first heat exchange unit is formed by curving a third heat exchange unit having a planar shape through L-shape bending, and a second heat exchange unit is formed by curving a fourth heat exchange unit having a planar shape through the L-shape bending, independently of the third heat exchange unit. The first heat exchange unit and the second heat exchange unit are arranged so as to be opposed to each other along a corner portion between adjacent two side surfaces of a casing.

Abstract: Provided is an outdoor unit for use in a refrigeration cycle apparatus circulating refrigerant mixture inclusive of 1,1,2-trifluoroethylene, the outdoor unit including: a casing; a pipe configured to allow the refrigerant mixture to flow through the pipe, the pipe being accommodated inside the casing and including a bend portion, the bend portion including a breakage-guide structure having a pressure resistance lower than a pressure resistance of rest of the pipe; and a plate interposed between the breakage-guide structure and outside of the casing.

Abstract: In a heat exchanger, a first heat exchange unit is formed by curving a third heat exchange unit having a planar shape through L-shape bending, and a second heat exchange unit is formed by curving a fourth heat exchange unit having a planar shape through the L-shape bending, independently of the third heat exchange unit. The first heat exchange unit and the second heat exchange unit are arranged so as to be opposed to each other along a corner portion between adjacent two side surfaces of a casing.

Abstract: A dehumidifier includes: a housing; a refrigerant circuit configured to allow low GWP refrigerant to circulate therethrough, the refrigerant circuit including a compressor having a variable operating frequency, a condenser, a pressure reducing device, and an evaporator, which are provided in the housing, the low GWP refrigerant being flammable and having a value of GWP of 6 or less; a blowing fan, which is provided in the housing, and is configured to take in air in a room into the housing and cause the taken-in air to pass through the evaporator and the condenser before blowing out the air from the housing into the room; and a water storage tank, which is provided below the evaporator, and is configured to accumulate dew condensation water generated in the evaporator, a number of refrigerant paths passing through the evaporator being greater than a number of refrigerant paths passing through the condenser.

Abstract: A condenser of a refrigeration cycle apparatus includes a first passage, a second passage, and a joint. The first passage connects to the compressor at a first end and is constituted of, at a second end, a first flat heat transfer tube including a plurality of passages thereof. The second passage connects to the expansion device at a first end and is constituted of, at a second end, a second flat heat transfer tube including a plurality of passages thereof. The joint joins the first flat heat transfer tube and the second flat heat transfer tube and bends a flow of the hydrofluoroolefin-based refrigerant between the first flat heat transfer tube and the second flat heat transfer tube. A length of the second passage is equal to or shorter than a length of the first passage. The joint is provided, inside thereof, with a hollow portion.