Abstract: An engine (1) comprises a compressed gas source (3) and a fluid circuit connected to an output of the compressed gas source such that compressed gas can be driven through the circuit by the compressed gas source. The output of the compressed gas source is connected, through the fluid circuit, to a turbine component (5) connected to a rotating shaft (9) that acts as the output of the engine in use. A heat exchanger (13) receives fluid in the circuit that has passed through the turbine component (5) and is arranged to reduce the temperature and pressure of the fluid. The turbine component (5) comprises a boundary layer turbine comprising a plurality of axially aligned discs (51), wherein each disc comprises an outlet vent (53) arranged towards the centre of the disc.

Abstract: A device for reducing gas density in a liquid phase refrigerant in a refrigeration system is provided, the device comprising; a fluid inlet; a first outlet; a second outlet; a conduit, linking the fluid inlet to the first and second outlets; and a baffle, arranged within the conduit between the accelerator and the first outlet; wherein, the accelerator is configured to accelerate fluid from the fluid inlet towards the outlets, thereby separating out saturated gas in the fluid to reduce the gas density in the fluid; and the baffle is configured to direct the flow of lower gas density fluid towards the second outlet, and allows higher gas density fluid to pass around the baffle towards the first outlet. By providing a device in this manner, the energy efficiency and quality of refrigeration in a refrigeration system is improved.

Abstract: A tyre comprising an adaptive tread, the adaptive tread comprising a plurality of surface sections, wherein each surface section can move without deformation relative to the other surface sections to form a tread pattern.

Abstract: An engine comprises a compressor and a closed fluid circuit connected to the input and output of the compressor such that compressed gas can be driven through the circuit by the compressor. The output of the compressor is connected, through the fluid circuit, to a turbine component comprising at least one set of turbine blades connected to a rotating shaft that acts as the output of the engine in use. A condenser receives fluid in the circuit that has passed through the turbine component and is arranged to reduce the temperature and pressure of the compressed gas, the outlet of the condenser being connected to the inlet of the compressor.

Abstract: An engine comprises a compressor and a closed fluid circuit connected to the input and output of the compressor such that compressed gas can be driven through the circuit by the compressor. The output of the compressor is connected, through the fluid circuit, to a turbine component comprising at least one set of turbine blades connected to a rotating shaft that acts as the output of the engine in use. A condenser receives fluid in the circuit that has passed through the turbine component and is arranged to reduce the temperature and pressure of the compressed gas, the outlet of the condenser being connected to the inlet of the compressor.