Abstract:
A method for controlling a flow of refrigerant to an evaporator (1) arranged in a refrigeration system is disclosed. The refrigeration system further comprises an expansion valve (12) and a compressor, the expansion valve (12), the evaporator (1) and the compressor being arranged in a refrigerant flow path having refrigerant flowing therein. The method comprises the steps of increasing an opening degree of the expansion valve (12), thereby increasing a flow of refrigerant to the evaporator (1) sufficiently to substantially eliminate a dry zone (3) of the evaporator (1), decreasing the opening degree of the expansion valve (12) after a period of time has lapsed, and repeating the steps of increasing and decreasing the opening degree of the expansion valve (12). Thus, the opening degree of the expansion valve (12) is 'pulsated'. This causes the superheat value of refrigerant leaving the evaporator (1) to 'toggle' between a zero level and a low, but positive, level. Thereby the average superheat value of the refrigerant leaving the evaporator (1) is decreased, and the refrigeration capacity of the evaporator (1) is utilised more efficiently. Simultaneously, it is ensured that the amount of liquid refrigerant being allowed to pass through the evaporator (1) is kept sufficiently low to prevent damage to the compressor.
Abstract:
An expansion valve (1) comprising an inlet opening (10), at least two outlet openings (7), a first valve part (2) and a second valve part (4) is disclosed. The inlet opening (10) is adapted to receive fluid medium in a liquid state, and the outlet openings (7) are adapted to deliver fluid medium in an at least partly gaseous state. The first valve part (2) comprises a piston portion (3), and the second valve part (4) comprises a piston receiving portion (5) adapted to receive the piston portion (3) of the first valve part (2). The piston receiving portion (5) has at least two openings (6) formed therein, each of the openings (6) being fluidly connected to one of the outlet openings (7). The openings (6) are arranged in such a manner that each of the openings (6) in combination with the piston portion (3) defines a valve. The first valve part (2) and the second valve part (4) are arranged movably relative to each other in such a manner that the mutual position of the first valve part (2) and the second valve part (4) defines an opening degree of each of the valves.
Abstract:
The invention concerns a device (1) for generating electrical energy with at least one piezo element (6, 7). It is endeavoured to enable local generation of electrical energy. For this purpose, at least one thermal expansion element (2) is in active connection with the piezo element (6, 7).
Abstract:
Coupling device to transferring a flow of fluids or substances, which device comprises a first coupling element (1) and a second coupling element (11). The first coupling element (1) comprises fluid channels with displacing elements (4) and first sealing elements (7) positioned by spring force from the biasing members (6) to seal the fluid openings in the displacing elements(4) when the coupling device is disconnected by the two coupling elements separated. The second coupling element (11) comprises fluid channels with valve bodies (15) positioned by spring force from second biasing members (16) to close the fluid openings and second sealing elements (17) to seal the second bores(13) in the second coupling element (11) when the coupling device is disconnected. When the two coupling elements are pushed together and guided by guiding elements (30) the fluidic flows are connected between inlets (14) and outlets (9). The sealing elements (7, 17) ensure tightness.
Abstract:
The invention provides a method of controlling a release of thermal energy in a building. The method comprises steps of defining a control criterion for the building, defining a set of climate variables which influence the release of thermal energy in the building, and defining for each climate variable, a climate signification index which defines the importance of that climate variable for the release of thermal energy in the building. Furthermore, the method comprises a step of receiving a set of predicted future climate variables, and subsequently a step of combining the climate signification indices and the predicted future climate variables to provide control instructions for release of an amount of thermal energy in the building to satisfy the control criterion. The invention further provides a comfort control system.
Abstract:
This invention relates to a unique occupancy-based electronic control of energy consuming devices, such as household devices like, but not limited to, thermostats, HVAC systems, radiators in general, or any device consuming energy even though no users of the device are present. The control and/or regulation is based on the distance and velocity of the inhabitants relative to the household. An additional feature is a peak load management system ensuring to store energy in energy reservoirs prior to load peaks on the electricity distribution network, using this energy during the load peaks.
Abstract:
A magnetic actuator (1 ) comprising a stationary part (3), a movable part (4) and a coil (10) arranged circumferentially relatively to the movable part (4) in such a manner that the movable part (4) is moved relatively to the stationary part (3) in response to a magnetic field induced when an electrical current runs in the coil (10). The stationary part (3) and the movable part (4) are shaped in such a manner that one is provided with a protruding part (5) and the other is provided with a recess (6) adapted to receive the protruding part (5). Thereby the minimum distance between the stationary part (3) and the movable part (4) are kept relatively low, and it is thereby possible to obtain a large pulling force without increasing manufacturing costs. The actuator (1 ) further comprises a shading ring (7) providing a magnetic field having a phase which is different from the phase of the field induced by the coil (10). This prevents the movable part (4) from repeatedly hitting the stationary part (3) and makes the actuator (1 ) suitable for use in AC as well as DC applications. The actuator (1 ) is suitable for use in a magnetic valve (9).
Abstract:
Es wird eine Kühlanlage angegeben mit einem Kaltemittelkreislauf, der mehrere Verdampferstrecken und einen eine Verteilung von Kaltemitteln auf die Verdampferstrecken bewirkenden Verteiler (5) aufweist, wobei der Verteiler (5) fur jede Verdampferstrecke ein ansteuerbares Ventil (14) aufweist. Man möchte mit einfachen Mitteln einen gewünschten Betrieb der Kühlanlage erreichen. Hierzu ist vorgesehen, dass der Verteiler (5) einen als Nockenwelle (21) ausgebildeten Rotor aufweist, der fur jedes Ventil (14) einen Nocken (25) aufweist.
Abstract:
Es wird ein Durchflußeinstellventil (1) angegeben mit einem Ventilgehäuse (2), das einen Durchflußkanal (3) aufweist, in dem eine Drosseleinrichtung (4, 11) mit einem verstellbaren Drosselelement (11) und eine Absperreinrichtung mit einem den Durchflußkanal (3) in einer Schließstellung verschließenden Absperrelement (4) angeordnet ist, wobei das Absperrelement (4) durch einen Handgriff (16) von außen betätigbar ist. Man möchte die Handhabung eines derartigen Durchflußeinstellventils vereinfachen. Hierzu ist vorgesehen, daß das Drosselelement (11) ebenfalls vom Handgriff (16) betätigbar ist.
Abstract:
Es wird ein Durchflußeinstellventil (1) angegeben mit einem Ventilgehäuse (2), das einen Kanalabschnitt (3) aufweist, durch den ein Durchflußkanal (4) mit einer Drosseleinrichtung geführt ist, wobei die Drosseleinrichtung ein einen Strömungsquerschnitt beeinflussendes Drosselelement (5) aufweist, das von außen durch eine Handhabe (17) verstellbar ist. Man möchte die Handhabung eines derartigen Durchflußeinstellventils einfach gestalten. Hierzu ist vorgesehen, daß die Handhabe (17) den Kanalabschnitt (3) umgibt.