A pressure exchanger (1) including a housing (2), a drive shaft (3) and a cylinder drum (4) rotatably arranged in the housing (2) is described, the cylinder drum (4) including two front faces and at least one cylinder (5) between the front faces, wherein the housing (2) includes a port flange (7, 8) at each end of the cylinder drum (4) and at least at one end of the cylinder drum (4) a pressure shoe (18) is arranged between the cylinder drum (4) and the port flange of this end. Such a pressure exchanger should be operated in a cost-effective manner. To this end an adjustable stop arrangement (19) is arranged between the pressure shoe (18) and the cylinder drum (4).

A pressure wave supercharger for compressing fresh air for an internal combustion engine includes a cold gas housing, a hot gas housing, and a rotor casing inside which a rotatable cell rotor is disposed. The hot gas housing has a high-pressure exhaust gas duct and a low-pressure exhaust gas duct, while the cold gas housing has a fresh air duct and a charge air duct. The high-pressure exhaust gas duct, the low-pressure exhaust gas duct, the fresh air duct and the charge air duct are fluidically connected to the cell rotor. The hot gas housing has a heat exchanger which is designed in such a way that at least a first bearing for a rotor shaft can be cooled.

A pressure wave supercharger for compressing fresh air for an internal combustion engine includes a cold gas housing, a hot gas housing, and a rotor casing inside which a rotatable cell rotor is disposed. The hot gas housing has a high-pressure exhaust gas duct and a low-pressure exhaust gas duct, while the cold gas housing has a fresh air duct and a charge air duct. The high-pressure exhaust gas duct, the low-pressure exhaust gas duct, the fresh air duct and the charge air duct are fluidically connected to the cell rotor. The hot gas housing has a heat exchanger which is designed in such a way that at least a first bearing for a rotor shaft can be cooled.

A system includes a hydraulic energy transfer system configured to exchange pressures between a first fluid and a second fluid. The first fluid is at a higher pressure than the second fluid. The system also includes a high pressure pump configured to increase a pressure of the second fluid. Additionally, the system includes a controller programmed to control one or more valves of the system to selectively route the second fluid to the hydraulic energy transfer system or to the high pressure pump based on an operating condition of the system.

A system includes a hydraulic energy transfer system configured to exchange pressures between a first fluid and a second fluid. The first fluid is at a higher pressure than the second fluid. The system also includes a high pressure pump configured to increase a pressure of the second fluid. Additionally, the system includes a controller programmed to control one or more valves of the system to selectively route the second fluid to the hydraulic energy transfer system or to the high pressure pump based on an operating condition of the system.

A system includes a hydraulic transfer system configured to exchange pressures between a first fluid and a second fluid, where the first fluid has a pressure higher than the second fluid, includes a sleeve comprising an elliptical shape, a cylindrical rotor disposed within the sleeve in a concentric arrangement, where the cylindrical rotor is configured to rotate circumferentially about a rotational axis and has a first end face and a second end face disposed opposite each other. The system includes a first and second end cover having a first and second surface which interface with a first and second end face of the rotor. The system includes a first and a second radial clearance disposed between the sleeve and the cylindrical rotor, where the radial clearances are configured to increase or decrease based at least in part on a pressure differential.

A system includes a hydraulic transfer system configured to exchange pressures between a first fluid and a second fluid, where the first fluid has a pressure higher than the second fluid, includes a sleeve comprising an elliptical shape, a cylindrical rotor disposed within the sleeve in a concentric arrangement, where the cylindrical rotor is configured to rotate circumferentially about a rotational axis and has a first end face and a second end face disposed opposite each other. The system includes a first and second end cover having a first and second surface which interface with a first and second end face of the rotor. The system includes a first and a second radial clearance disposed between the sleeve and the cylindrical rotor, where the radial clearances are configured to increase or decrease based at least in part on a pressure differential.

A system includes an isobaric pressure exchanger (IPX) configured to couple to a manifold. The IPX is also configured to exchange pressure within the IPX between a first fluid at a first pressure and a second fluid at a second pressure. The IPX also includes a housing and at least one manifold connector disposed within the housing that is configured to couple the IPX to the manifold.

A system includes an isobaric pressure exchanger (IPX) configured to couple to a manifold. The IPX is also configured to exchange pressure within the IPX between a first fluid at a first pressure and a second fluid at a second pressure. The IPX also includes a housing and at least one manifold connector disposed within the housing that is configured to couple the IPX to the manifold.

A vapour compression refrigeration system has a main refrigerant circuit having a main gas cooler or condenser arranged in a high pressure branch, a first main evaporator arranged in a first low pressure branch, a main compressor fluidically connecting the first low pressure branch to the high pressure branch, and an expansion device connecting the high pressure branch to an intermediate pressure branch. The system has a by-pass branch connecting the high-pressure branch to the intermediate pressure branch and provided with a by-pass valve, a secondary refrigerant circuit having a secondary gas cooler or condenser arranged in a secondary high pressure branch, a secondary evaporator arranged in a secondary low pressure branch, and a secondary expansion device connecting the secondary high pressure branch to the secondary low pressure branch. A rotary pressure exchanger is fluidically connected to the by-pass branch downstream of the by-pass valve and the secondary refrigerant circuit.