The high pressure compressor wheel of a two stage turbocharger assembly is cooled by charge air bled from the charge air flowpath downstream of the aftercooler. A wastegate may be arranged across the high pressure stage and operated by an actuator which in turn is operable by the static or dynamic pressure of the charge air in the cooling flowpath. The cooling airflow may be blocked to open the wastegate and released or resumed to close the wastegate so that cooling air is supplied only while the high pressure compressor wheel is under load.

Decane (C10H22) is sprayed as a mist from spray nozzles toward a rotor blade via a supply pipe and communication passages. Since decane has a boiling point of 174° C. at atmospheric pressure, the decane is a liquid at normal temperature and normal pressure. On the other hand, the pressure inside a turbomolecular pump is in a substantially vacuum state of about 100 Pa, and the boiling point of decane at this pressure is 14° C. Thus, although the pressure is high and the decane is in a liquid state until the decane is sprayed, when the decane adheres to surfaces of the rotor blades and the temperature of the decane rises, the decane vaporizes. At this moment, since the amount of heat of the rotor blades is consumed as heat of vaporization, the rotor blades can be cooled.

An aircraft propulsion system comprises an engine, a propeller drive shaft drivingly engaged with the engine, a propeller for propelling an aircraft and a fan driving cooling air along a flow path in thermal communication with the engine. The engine may be an internal combustion engine or other engine type having heat rejection requirements and the fan may facilitate cooling of the engine. The propulsion system may have a pusher configuration.

The present disclosure provides a fan coil unit and an air conditioning system. The fan coil unit includes: a housing, which defines an airflow inlet, an airflow outlet, and an airflow path from the airflow inlet to the airflow outlet; a cross-flow fan, which is located at the airflow inlet to introduce an airflow into the housing; and a heat exchange unit located downstream of the cross-low fan on the airflow path.

Turbomachine (10), in particular for a fuel cell system (1). The turbomachine (10) comprises a compressor (11), a drive device (20) and a shaft (14). The compressor (11) has a rotor (15) arranged on the shaft (14), a compressor inlet (11a) and a compressor outlet (11b). A working fluid can be delivered from the compressor inlet (11a) to the compressor outlet (11b). A drive cooling path (92) for cooling the drive device (20) branches off at the compressor outlet (11b). Also proposed is a fuel cell system (1) with a turbomachine (10) according to the invention, a method for operating the turbomachine (10) and a method for operating the fuel cell system (1).

A multistage compression system uses refrigerant and oil. The multistage compression system includes a low-stage compressor that compresses the refrigerant, a high-stage compressor that further compresses the refrigerant compressed by the low-stage compressor, refrigerant pipes that introduce the refrigerant compressed and discharged by the low-stage compressor into a suction part of the high-stage compressor, an intercooler, and an oil discharge pipe. The intercooler cools the refrigerant discharged by the low-stage compressor before the refrigerant is sucked into the high-stage compressor. The intercooler is disposed between the refrigerant pipes. The oil discharge pipe discharges the oil in the low-stage compressor. The oil discharge pipe connects the low-stage compressor and a portion of the refrigerant pipes. The portion of the refrigerant pipes is on an upstream side of the intercooler.

The compression train (13) for a dehydrogenation plant (1) comprises a driver (36) and a single centrifugal compressor (35) drivingly coupled to the driver. The centrifugal compressor comprises a single casing and a plurality of compressor sections (39.1, 39.2, 39.3) inside said casing (37). Each compressor section comprises at least one impeller (40.1, 40.2) arranged for rotation in the casing (37). The compressor (35) is adapted to compress a mixture containing propane, propylene and hydrogen, having a molecular weight between 20 and 35 g/mol, from a suction pressure between about 0.2 barA and about 1.5 barA to a delivery pressure between about 11 barA and about 20 barA, with a volumetric flowrate comprised between about 120,000 m.sup.3/h and about 950,000 m.sup.3/h.

This indoor unit of an air conditioner includes an indoor unit main body having an inlet and an outlet; a heat exchanger; and a cross-flow fan configured to blow out air, which has undergone heat exchange by the heat exchanger. The cross-flow fan has a blow-out flow path that is configured such that a cross-sectional area gradually increases downward, with the blow-out flow path guiding blown-out air to the outlet. When a distance in the lower wall from an intersection, where a tangent inscribing a tongue of the cross-flow fan orthogonally intersects the lower wall, to a lower end of the indoor unit main body is referred to as distance L, a ratio (L/D) of the distance L to outer diameter D of an impeller of the cross-flow fan is less than 0.05. At least part of the blow-out flow path is formed to project out of the outlet at least when air conditioning operation is performed.

A non-positive displacement type pressurizing device for pressurizing a fluid includes a rotor including a rotary blade row including a plurality of rotary blades provided at intervals in a circumferential direction; a casing that accommodates the rotor; a stationary blade row supported by the casing and including a plurality of stationary blades provided at intervals in the circumferential direction; and a plurality of heat exchanging units for cooling the fluid, wherein the heat exchanging units are configured to divide a flow path formed between stationary blades, of the plurality of stationary blades, adjacent to one another in the circumferential direction in a height direction of the stationary blades.

A heat exchanger for changing a temperature of a pumped gas flow and a pump comprising the heat exchanger is disclosed. The heat exchanger comprises: at least one tube configured to contain a flow of fluid; said at least one tube being at least partially embedded within a block of material; wherein said heat exchanger comprises mounting means configured to mount said heat exchanger adjacent to a gas port of a pump such that a least a portion of said heat exchanger extends into a path for gas flow flowing through said gas port; wherein the mounting means comprises a flange, the flange being configured to connect with the gas port of the pump, the block being mounted to the flange such that the block extends towards the rotor of the pump when the flange is connected with the gas port of the pump.