A compressor operable in a heat pump mode of a refrigerant circuit includes a compression space in which a refrigerant is compressed. The compression space includes a discharge port and an injection port. A discharge chamber is fluidly coupled to the compression space by the discharge port. An injection chamber is fluidly coupled to the compression space by the injection port. A discharge recirculation pathway selectively provides fluid communication between the discharge chamber and the injection chamber. An injection of the recirculated refrigerant into the compression space through the injection port results in an increase in pressure, and hence temperature, of the refrigerant when discharged to the discharge chamber. The increased temperature of the discharged refrigerant increases a heating capacity of a condenser of the associated refrigerant circuit.

A compressor operable in a heat pump mode of a refrigerant circuit includes a compression space in which a refrigerant is compressed. The compression space includes a discharge port and an injection port. A discharge chamber is fluidly coupled to the compression space by the discharge port. An injection chamber is fluidly coupled to the compression space by the injection port. A discharge recirculation pathway selectively provides fluid communication between the discharge chamber and the injection chamber. An injection of the recirculated refrigerant into the compression space through the injection port results in an increase in pressure, and hence temperature, of the refrigerant when discharged to the discharge chamber. The increased temperature of the discharged refrigerant increases a heating capacity of a condenser of the associated refrigerant circuit.

A cooling circuit comprises a refrigerant compressor incorporating a suction port and a pressure chamber incorporating a pressure port, a condenser arranged downstream of the pressure port, a fluid collecting chamber in which a reservoir of refrigerant is formed, an evaporator which is located between the condenser and the suction port, a feed unit which is connected at one side to the refrigerant reservoir and to the pressure chamber at the other side and which serves for supplying refrigerant from the refrigerant reservoir to the pressure chamber which incorporates a pumping unit for the refrigerant. It is proposed that in order improve this cooling circuit, the pumping unit comprise a pressure-tight closed housing which is provided with only one inlet and one outlet as access points and a pumping element which is movable for pumping the refrigerant be arranged in the pumping chamber thereof.

A refrigerant compressor according to an exemplary aspect of the present disclosure includes, among other things, a floating ring seal having a nose configured to contact a housing. Further, a low friction coating including carbon nanotubes (CNTs) is applied to one or both of the nose and the housing. In another aspect of this disclosure, the floating ring seal has first and second noses configured to contact the housing, and the first nose is radially spaced-apart from the second nose.

A climate-control system may include a first compressor, a second compressor, a suction manifold, and a flow restrictor. The first and second compressors each include a shell and a compression mechanism. The shells define suction chambers from which the compression mechanisms draw working fluid. The shells include suction inlet fittings through which working fluid is drawn into the suction chambers. The suction inlet fittings are fluidly connected to the suction manifold. The suction manifold provides suction-pressure working fluid to the suction inlet fittings of the first and second compressors. The flow restrictor may be at least partially disposed within the suction manifold.

A refrigeration apparatus (1) includes a main refrigerant circuit (2) including a positive displacement compressor (4), a condenser (6), an expansion valve (8), and an evaporator (10), through which a refrigerant circulates successively in a closed loop circulation, a lubrication refrigerant line (18) connected to the main refrigerant circuit (2) between the condenser (6) and the expansion valve (8) or to the condenser (6), in which circulates a portion of the refrigerant of the main refrigerant circuit (2) and connected to the compressor (4) for lubrication of said compressor (4) with the refrigerant, at least one lubrication refrigerant storing cavity (70) connected to the lubrication refrigerant line (18), the lubrication refrigerant storing cavity (70) being configured to store liquid refrigerant for lubrication of the compressor (4) said at least one lubrication refrigerant storing cavity (70) being provided within the compressor (4).

A refrigeration cycle apparatus includes a refrigerant circuit including a compressor, a condenser, a pressure reducing device, and an evaporator connected by a refrigerant pipe. A refrigerant including a refrigerant having flammability is used as refrigerant circulating in the refrigerant circuit. The evaporator and the pressure reducing device are accommodated in a unit. The evaporator is disposed in the unit in such a manner that a linear distance between a refrigerant inlet of the evaporator and a refrigerant outlet of the pressure reducing device is shorter than a linear distance between a refrigerant outlet of the evaporator and the refrigerant outlet of the pressure reducing device.

Provided is a method of constructing a natural gas liquefaction plant, which can shorten a construction time period by minimizing effect of a lead time for the refrigerant compressor thereon, the method including: transporting a refrigerant compression module body 175 to an installation area 85, wherein the refrigerant compression module body is provided with a frame 120 configured to allow refrigerant compressor 150 for compressing a refrigerant for cooling natural gas to be mounted therein; installing the refrigerant compression module body 175 to the installation area 85; and mounting the refrigerant compressor 150 into a mounting space 130 predefined in the frame 120 of the installed refrigerant compression module body.

A diaphragm compressor includes first structure having a first pressing part, a first diaphragm, and a first substrate partially separated from the first diaphragm and partially joined to the first diaphragm, a second structure having a second pressing part, a second diaphragm, and a second substrate partially separated from the second diaphragm and partially joined to the second diaphragm, the first structure and the second structure being stacked in a stacking direction in which the first diaphragm and the first substrate are stacked, wherein the first pressing part is placed at sides of the first diaphragm opposite to the first substrate, and a first separation portion between the first diaphragm and the first substrate is part of a first channel in which a fluid flows, the second pressing part is placed at sides of the second diaphragm opposite to the second substrate, and a second separation portion between the second diaphragm and the second substrate is part of a second channel in which a fluid flows, the first channel and the second channel are placed in series, as seen from the stacking direction, the first pressing part overlaps the second pressing part, and a buffer chamber holding the fluid is provided between the first channel and the second channel.

A diaphragm compressor includes first structure having a first pressing part, a first diaphragm, and a first substrate partially separated from the first diaphragm and partially joined to the first diaphragm, a second structure having a second pressing part, a second diaphragm, and a second substrate partially separated from the second diaphragm and partially joined to the second diaphragm, the first structure and the second structure being stacked in a stacking direction in which the first diaphragm and the first substrate are stacked, wherein the first pressing part is placed at sides of the first diaphragm opposite to the first substrate, and a first separation portion between the first diaphragm and the first substrate is part of a first channel in which a fluid flows, the second pressing part is placed at sides of the second diaphragm opposite to the second substrate, and a second separation portion between the second diaphragm and the second substrate is part of a second channel in which a fluid flows, the first channel and the second channel are placed in series, as seen from the stacking direction, the first pressing part overlaps the second pressing part, and a buffer chamber holding the fluid is provided between the first channel and the second channel.