Abstract: The invention concerns a vane cell machine having a stator and a rotor that is made of a first material, the rotor having guides comprising radially displaceable vanes that rest on an inside of the stator and border work chambers at each axial end of the rotor together with the rotor, the stator and individual stationary side walls, the vanes having, at least at some contact faces with the rotor and the stator, a second material that interacts unfrictionally with the first material. It is endeavoured to keep the wear small. For this purpose, in a radially inner area, the side wall comprises a surface of a third material interacting unfrictionally with the first material and, in a radially outer area a surface made of the first material.

Abstract: An air duct arrangement for cooling a group (1) of at least two heat producing modules is provided, said modules (2, 3) being arranged one after the other in the direction of an air flow through said group (1), said air duct arrangement comprising an air path (5, 6) for each module (2, 3). The cooling of modules of a group of modules with cooling air should be enabled with only small space requirements. To this end said air paths (5, 6) are arranged in parallel along a lengthwise direction from a first side of said group (1) to a second side of said group (1), said second side being opposite to the first side, said air path (5, 6) changing their order in a direction perpendicular to said lengthwise direction in a region (13) between said two modules (2, 3).

Abstract: A vapour compression system comprises a compressor, a condenser, an expansion device, e.g. in the form of an expansions valve, and an evaporator arranged along a refrigerant path. A method for operating the vapour compression system comprises the steps of: obtaining a superheat value being representative for the superheat of refrigerant entering the compressor; obtaining a subcooling value being representative for the subcooling of refrigerant entering the expansion device; and operating the expansion device on the basis of the obtained superheat value and on the basis of the obtained subcooling value. The subcooling value is taken into account when operating the expansion device, because variations in the subcooling value have significant influence on the refrigerating capacity of the evaporator at a given opening degree of the expansion device, thereby resulting in a more stable operation of the system. The system may further comprise an internal heat exchanger.

Abstract: A method for operating a vapour compression system is disclosed. The vapour compression system comprises a compressor, a condenser, at least one expansion device, an evaporator, said evaporator comprising at least two evaporator paths arranged fluidly in parallel, and a distribution device arranged to distribute refrigerant among the evaporator paths. The method comprises the steps of obtaining at least two predefined distribution keys, each distribution key defining a distribution of available refrigerant among the evaporator paths, detecting one or more operational settings of the vapour compression system, selecting one of the at least two predefined distribution keys, based on said detected operational setting(s), and distributing refrigerant among the evaporator paths in accordance with the selected predefined distribution key.

Abstract: The present invention relates to especially microfluidic analysis systems where the emitted light of a emitting source is measured by optic detection, and where a transparent body separates the emitting source from the optic detector. The invention especially relates to optic calibration of the device, the calibration being related to changes in the transparency of the transparent body and/or changes in the temperature of the emitting source.

Abstract: The invention provides an electromagnetic actuator for moving a closure member of a valve. The actuator contains a solenoid, a yoke and a wire spring for fixing a guide tube, in which the closure member is movable, to the solenoid. The spring is formed so that it further fixes the yoke to the solenoid. Accordingly, the number of components is reduced, and detaching of the yoke may easily be facilitated.

Abstract: The invention concerns a reverse osmosis system (1) with at least one membrane unit (2) comprising an inlet (3), a permeate outlet (4) and a concentrate outlet (5), a high-pressure pump (8) that is connected to the inlet (3), a pressure exchanger (11) comprising at least one high-pressure concentrate connection (HPC), and a booster pump. It is endeavoured to achieve the lowest possible energy consumption. For this purpose, the booster pump is made as a displacement pump (16) that is arranged between the concentrate outlet (5) and the high-pressure concentrate connection (HPC) of the pressure exchanger (11).

Abstract: A piston compressor, particularly a refrigerant compressor includes a compression chamber in a compressor block, the compression chamber being delimited by a cylinder head (10), the cylinder head (10) comprising at least one valve plate arrangement with at least one suction valve (23, 24) and at least one pressure valve (21, 22), as well as a valve cover (12). To achieve low manufacturing costs, though maintaining a good efficiency, the valve plate arrangement (16) is formed by a carrier plate (17) that comprises the suction valve (23, 24, 26, 27) and the pressure valve (18, 19, 21, 22) and is connected by at least one gas-tight connection seam (28, 31) to the valve cover (12), the connection seam (28, 31) separating a suction area (32) and a pressure area (29, 30) from one another and sealing at least the pressure area (29, 30) towards the outside.

Abstract: A method for controlling a refrigeration system with a variable compressor capacity, and at least two refrigeration entities, e.g. display cases, includes controlling suction pressure by either permitting or preventing the flow of refrigerant into the evaporators of one or more refrigeration entities. The method also includes controlling compressor capacity based on a signal derived from one or more properties of the one or more refrigeration entities, said signal reflecting a possible difference between the current compressor capacity and a current refrigeration demand of the refrigeration system. The method reduces wear on compressors by avoiding switching them ON or OFF to the largest extent possible, and also prevents problems relating to conflicting control strategies due to control parameters, e.g. suction pressure, being determined based on two or more controllable parts, e.g. compressors and flow of refrigerant into refrigeration entities.

Abstract: The invention relates to a thermal energy storage system comprising at least one thermal reservoir and at least one thermal energy transfer means that, at least at times, are able to transfer thermal energy from at least one first section of the thermal reservoir to at least one second section of the thermal reservoir. The invention also relates to a method changing the energy distribution of a thermal reservoir wherein thermal energy is transferred from at least one first section of the thermal reservoir to at least one second section of the thermal reservoir.

Abstract: A method is provided for adjusting several parallel connected heat exchangers supplied with a coolant medium. The aim of the invention is to simplify the adjustment. For this purpose, the method consists in a) determining a specific value of heat requirement for each heat exchanger in a predetermined time period; b) comparing the specific values of all heat exchangers therebetween and c) in modifying the adjustment of the heat exchanger having the lowest specific value of heat requirement in such a way that the heat requirement thereof is increased.

Abstract: A filter device may include a filter housing having at least one filter element configured to separate the filter housing into a raw side and a clean side. A bypass valve may control a bypass for circumventing the at least one filter element, wherein the bypass valve may have a valve member for controlling a bypass opening connecting the clean side of a coupling chamber of the bypass valve with the raw side. The valve member may be configured to close the bypass opening via a pretension generated by a closing spring. The bypass valve may be an actuating device for changing the pretension acting on the valve member and the actuating device may be coupled with at least one control chamber and configured to set the pretension acting on the valve member based at least in part on a control pressure of the control chamber.

Abstract: A method for determining wire connections in a vapour compression system (1) is disclosed. The vapour compression system comprises a compressor, a condenser, an expansion device (2) and an evaporator (3) being fluidly interconnected in a refrigerant path, and two or more sensor devices (7, 8, 9, 10, 11) arranged for measuring variables which are relevant for the operation of the vapour compression system (1). The method comprises the steps of changing an operational setting, e.g. an opening degree of the expansion device (2) for the vapour compression system (1), monitoring variable values, such as temperatures, being measured by at least two sensor devices (7, 8, 9, 10, 11), e.g.

Abstract: A method to manufacture a valve using metal injection moulding is disclosed. The valve housing comprises a welding cap for welding the upper part of the valve to the valve housing. The welding cap is placed so the upper part can be welding to the housing without damaging the inner cavity of the housing. There is a gab between the welding cap and the inner liner so the heat from the welding to not damage the inner liner allowing the inner parts of the valve to move freely.

Abstract: A tubular elastomer actuator with a shape in a cross-sectional view which shape exposes at most one single axis of symmetry of a specific length, e.g., an oval shape. The actuator could be made from a sheet made from a plurality of plate shaped elements which are laminated together and rolled. Each plate shaped element may have a corrugation that gives the element an anisotropic structure, and contains an electrode on only one surface. The actuator displacement is the result of shrinkage displacement of the plate shaped elements upon the application of electrical field across their thickness.

Abstract: A method for providing a multilayer composite includes the steps of providing a first composite comprising a film of a dielectric material with a front surface and an opposite rear surface, the front surface comprising a surface pattern; depositing an electrically conductive layer onto the surface pattern; providing a second composite comprising a film with a front surface and an opposite rear surface, the front surface comprising a surface pattern; depositing an electrically conductive layer covering at least a portion of the surface pattern; arranging the first composite on the second composite; and fixating the position of the first composite relative to the second composite.

Abstract: The invention concerns a refrigeration system comprising a refrigerant circuit which comprises several evaporator paths and a distributor (5) which distributes the refrigerant on the evaporator paths. The aim of the invention is to improve the operation of said refrigeration system in a simple manner. According to the invention, the distributor (5) comprises a controllable valve (12) for each evaporation path.