Abstract:
A centrifugal compressor for a refrigeration system is disclosed. The centrifugal compressor includes a first impeller arranged to provide a radial flow inlet. Further, an impeller for a centrifugal compressor is disclosed. The impeller includes an inlet end, an outlet end, and a plurality of blades extending from the inlet end to the outlet end. The plurality of blades are radially exposed adjacent the inlet end to provide a radial flow inlet. These and other features of the present disclosure can be best understood from the following drawings and detailed description.
Abstract:
The invention discloses a controller for a vapour compression system for cooling a refrigerated space. The system comprises a circuit for circulation of a refrigerant between a compressor (2), a condenser (3), and an evaporator (4). An expansion valve (5) controls a flow of the refrigerant into the evaporator (4) and thereby cooling of the refrigerated space. The control system is adapted to control the expansion valve (5) based on a first temperature (Tl) in the circuit between the evaporator (4) and the compressor (2) and a second temperature (T2) determined in the refrigerated space.
Abstract:
The invention relates to a method for controlling a refrigerator. The method comprises the steps of establishing a time interval of a certain duration, a first use of the refrigerator starting a first time interval, starting a subsequent time interval based on the start of the first time interval, and subtracted a time difference. The subsequent time interval subtracted a time difference is being used for starting a cool-down period of the subsequent time interval. The invention also relates to a control unit for the refrigerator and to a refrigerator with such control unit.
Abstract:
The invention relates to a method for controlling a refrigeration system by establishing a defrost period during an initial defrost period. One or more compressors of the refrigeration system are monitored to establish if the one or more compressors are running, and a parameter representative of the one or more compressors running is monitored. The monitoring establishes at least one parameter limit value representative of whether a defrost period or a non-defrost period is to be initiated. The invention also relates to a method for controlling a refrigeration system subsequent to an electrical power interruption. The invention also relates to control units for applying one or both of the methods according to the invention, and to a refrigeration system having one or more control units controlling the refrigeration system according to one or both of the methods.
Abstract:
A valve arrangement for controlling a heating or cooling fluid is provided, said valve arrangement comprising: a valve housing (2) having an inlet (3) and an outlet (4), a flow control valve (5) arranged between the inlet (3) and the outlet (4), said flow control valve (5) comprising a valve seat (7) and a valve element (6). It is intended to enchance the comfort of a user in a room to be heated or cooled. To this end the valve (7) is mounted detachably in the valve housing (2).
Abstract:
A valve arrangement (1) for controlling a flow of a heating or cooling fluid is provided, said valve arrangement (1) comprising: a housing (2) having an inlet (3) and an outlet (4), a pressure regulating valve (11) being arranged between said inlet (3) and said outlet (4) and having a regulating valve element (12) and a regulating valve seat (13), said regulating valve element (12) being connected to a membrane (15), said membrane (15) having a flexible part (17) and being loaded on one side by an inlet pressure at the inlet (3) and on the opposite side by an outlet pressure at the outlet (4). In such a valve arrangement the risk of damages should be reduced. To this end a membrane supporting structure (25, 27, 28) is provided, said supporting structure (25, 27, 28) supporting said flexible part (17) of said membrane (15) when a force or a pressure acting on the membrane (15) exceeds a predetermined value.
Abstract:
Es wird ein Ventil, insbesondere ein Heizkörperventil (1) angegeben mit einem Gehäuse (2, 3), einem Einlass (4), einem ersten Auslass (13), mindestens einem zweiten Auslass (14), einer Ventilsitzanordnung, die für jeden Auslass (13, 14) einen Ventilsitz (10, 11) aufweist, und eine Ventilelementanordnung, die mit der Ventilsitzanordnung zusammenwirkt, entlang einer Betätigungsachse (12) bewegbar ist und im geschlossenen Zustand mit dem dem ersten Auslass (13) zugeordneten Ventilsitz (10) und dem dem mindestens einen zweiten Auslass (14) zugeordneten Ventilsitz (11) jeweils eine Schließlinie bildet. Man möchte ein derartiges Ventil einfach aufbauen können. Hierzu ist vorgesehen, dass die mindestens zwei Schließlinien an einem gemeinsamen Ventilelement (9) angeordnet sind, die Schließlinien entlang der Betätigungsachse (12) um einen vorbestimmten Abstand relativ zueinander versetzt sind und das Ventilelement (9) oder die Ventilsitzanordnung zumindest im Bereich einer Schließlinie um den Abstand verformbar ist.
Abstract:
A method for operating a heating system (1) is provided, said heating system (1) comprising a heat source (5) and in a room (2-4) at least a room heat ex- changer (6-8) which is connected to said heat source (5) and controlled thermo¬ statically by a control valve (11-13), said heat source (5) outputting a heating fluid having a supply temperature, said supply temperature being controlled ac¬ cording to a heat curve, said heat curve showing a relation between said supply temperature and an outdoor temperature, wherein the method comprises the step of adjusting said heat curve. The heat curve should be adjusted such that energy waste can be minimized while keeping the desired comfort temperature. To this end, the method comprising further the steps of determining the heat emitted in said room (2-4), comparing said emitted heat to a maximum level of heat emission, decreasing the slope of the heat curve, when the emitted heat is lower than a first predetermined fraction of the maximum level of heat emission, increasing the slope of the heat curve, when the emitted heat is above a second predetermined fraction of the maximum level of heat emission, and leaving the heat curve when the emitted heat is in a range between said first fraction and said second fraction of the maximum level of heat emission.
Abstract:
A flow control valve (1) and a method for assembling a flow control valve (1) are disclosed. The flow control valve (1) comprises a first housing part (2) and a second housing part (3) attached directly to each other, in such a manner that the first housing part (2) and the second housing part (3) form a substantially closed housing. The first housing part (2) defines a first flow section (4), a second flow section (5), a connecting port (6) fluidly interconnecting the first flow section (4) and the second flow section (5), and a valve seat (7) arranged at the connecting port (6). The flow control valve (1) further comprises a frame part (9) arranged in an interior part of the housing formed by the first housing part (2) and the second housing part (3), the frame part (9) having mounted thereon a valve element (10, 13) arranged movably relative to the valve seat (7), a moving mechanism, e.g. including a spindle (12), for moving the valve element (10, 13), and an actuating mechanism, e.g. a stepper motor (14), for operating the moving mechanism. The frame part (9) is attached directly to the first housing part (2) or to the second housing part (3).
Abstract:
The present invention relates to a spray head for effective fire fighting. The spray head according to the present invention provides a uniform distribution of a fluid, such as pressurised water, over a relatively large area. To achieve this, the spray head comprises a body defining a central axis and further comprising a fixation structure for fixing the spray head to a fluid supply system, a fluid inlet, directing fluid in a first direction, a plurality of outlet holes arranged around the central axis, and a flow path between the inlet and the holes, wherein a first set of holes are located in such a way, that the fluid is leaving the first set of holes in a second direction opposite to the first direction and wherein the body further comprises an arrangement for holding a fire actuation member.