A refrigeration apparatus includes: a refrigerant circuit that condenses a refrigerant discharged from a compressor, decompresses the refrigerant with a capillary tube, and causes the refrigerant to evaporate in an evaporator to exhibit a refrigeration effect, wherein, as the refrigerant in the refrigerant circuit, a mixed refrigerant containing a first refrigerant having a boiling point in an ultralow temperature range of not less than 89.0 C. and not more than 78.1 C. and carbon dioxide (R744) is enclosed, and a heater that heats at least a portion of a suction pipe through which the refrigerant that returns from the evaporator to the compressor passes is provided.

A refrigeration apparatus includes: a refrigerant circuit that condenses a refrigerant discharged from a compressor, decompresses the refrigerant with a capillary tube, and causes the refrigerant to evaporate in an evaporator to exhibit a refrigeration effect, wherein, as the refrigerant in the refrigerant circuit, a mixed refrigerant containing a first refrigerant having a boiling point in an ultralow temperature range of not less than 89.0 C. and not more than 78.1 C. and carbon dioxide (R744) is enclosed, and a heater that heats at least a portion of a suction pipe through which the refrigerant that returns from the evaporator to the compressor passes is provided.

A heat exchanger assembly includes at least one coil shaped heat exchanger pipe assembly for passing through a fluid to be heated, which has an inlet, an outlet and coil windings extending concentrically around a coil axis. The heat exchanger assembly further includes a housing in which the heat exchanger pipe assembly is received, such that a flue gas transport gap extends between the heat exchanger pipe assembly and the circumferential wall. In use, hot flue gas passes the coil windings, thereby imparting the heat to the fluid present in the heat exchanger pipe assembly. The housing has a first and a second end wall which close off a first end and a second end of the circumferential wall. The housing is made of plastic and the heat exchanger pipe assembly is clamped in axial direction between the first and the second end wall of the plastic housing.

A heat exchanger assembly includes at least one coil shaped heat exchanger pipe assembly for passing through a fluid to be heated, which has an inlet, an outlet and coil windings extending concentrically around a coil axis. The heat exchanger assembly further includes a housing in which the heat exchanger pipe assembly is received, such that a flue gas transport gap extends between the heat exchanger pipe assembly and the circumferential wall. In use, hot flue gas passes the coil windings, thereby imparting the heat to the fluid present in the heat exchanger pipe assembly. The housing has a first and a second end wall which close off a first end and a second end of the circumferential wall. The housing is made of plastic and the heat exchanger pipe assembly is clamped in axial direction between the first and the second end wall of the plastic housing.

A water heating assembly is disclosed the includes a core heating element and an outer tube in which the core heating element is arranged. Also disclosed are methods for producing and using the water heating assembly.

A heat exchanger assembly is provided which includes a coaxial heat exchanger that is formed, at least in part, of a more corrosion resistant material such as, but not limited to stainless steel, titanium and/or alloys thereof. The assembly further includes a condenser tee connected at each end of the coaxial conduit or tubing defining the heat exchanger. The assembly allows for a non-brazed connection of the condenser tee to an inner tube of the coaxial heat exchanger. In some embodiments, the compression fitting may be connected directly to the heat exchanger without the use of a tee.

A heat exchanger assembly is provided which includes a coaxial heat exchanger that is formed, at least in part, of a more corrosion resistant material such as, but not limited to stainless steel, titanium and/or alloys thereof. The assembly further includes a condenser tee connected at each end of the coaxial conduit or tubing defining the heat exchanger. The assembly allows for a non-brazed connection of the condenser tee to an inner tube of the coaxial heat exchanger. In some embodiments, the compression fitting may be connected directly to the heat exchanger without the use of a tee.

The present invention application relates to a spiral heat exchanger and a heat exchange device. The spiral heat exchanger comprises: a core shaft (1), the axis of which extends in the left-right direction, a first liquid-passing coiled tape (2) spirally wound around the periphery of the core shaft (1) by at least two circles and having a spiral liquid channel (201) therein; the first liquid-passing coiled tape (2) of adjacent layers is isolated by a certain distance, thereby forming a left-right through spiral first air flow channel (3); the first liquid-passing coiled tape (2) is provided with first liquid inlet/outlet ports (4) and second liquid inlet/outlet ports (5) which are arranged at intervals along the length direction of the liquid-passing coiled tape (2) and communicated with each other by means of the spiral liquid channel (201); the first liquid inlet/outlet ports (4) are arranged at the inner side end of the first liquid-passing coiled tape (2) in the spiral direction and extend out of the left side in a direction parallel to the axis of the core shaft (1); the second liquid inlet/outlet ports (5) extend out of the right side in a direction parallel to the axis of the core shaft (1).

The present invention application relates to a spiral heat exchanger and a heat exchange device. The spiral heat exchanger comprises: a core shaft (1), the axis of which extends in the left-right direction, a first liquid-passing coiled tape (2) spirally wound around the periphery of the core shaft (1) by at least two circles and having a spiral liquid channel (201) therein; the first liquid-passing coiled tape (2) of adjacent layers is isolated by a certain distance, thereby forming a left-right through spiral first air flow channel (3); the first liquid-passing coiled tape (2) is provided with first liquid inlet/outlet ports (4) and second liquid inlet/outlet ports (5) which are arranged at intervals along the length direction of the liquid-passing coiled tape (2) and communicated with each other by means of the spiral liquid channel (201); the first liquid inlet/outlet ports (4) are arranged at the inner side end of the first liquid-passing coiled tape (2) in the spiral direction and extend out of the left side in a direction parallel to the axis of the core shaft (1); the second liquid inlet/outlet ports (5) extend out of the right side in a direction parallel to the axis of the core shaft (1).

A gearbox oil cooling assembly for a gearbox driving a drive shaft having a drive shaft coupling. The assembly includes a heat exchanger to receive and cool an oil from the gearbox and having an inlet. Also included is an impeller axially disposed between the heat exchanger and the drive shaft coupling, wherein the impeller is operatively coupled to, and rotated by, the drive shaft operatively coupled to the drive shaft coupling. Further included is an exhaust duct operatively coupled to the heat exchanger and disposed radially outwardly around the impeller and defining an airflow pathway through which air passes through the inlet, the impeller and through the exhaust duct according to the rotation of the impeller to cool the oil in the heat exchanger.