Abstract:
A method for controlling a refrigeration system comprising a variable compressor capacity, and at least two refrigeration entities 4, e.g. display cases. Suction pressure is controlled by means of permitting/preventing a flow of refrigerant into evaporator of one or more refrigeration entities 4. Compressor capacity is controlled to match a desired capacity level and based on a signal derived from one or more properties of the one or more refrigeration entities 4, said signal reflecting a possible difference between the current compressor capacity and a current refrigeration demand of the refrigeration system. Reduces wear on compressors because switching them ON/OFF is avoided to the largest extent possible. Prevents problems relating to conflicting control strategies due to control parameters, e.g. suction pressure, being controlled by means of two or more controllable parts, e.g. compressors and flow of refrigerant into refrigeration entities.
Abstract:
A method for controlling a temperature in a refrigeration system using a quality decay value expressing an expected decay rate in quality of the products being refrigerated, and which depends on the temperature of air present in the refrigeration system. The quality decay value is obtained using a mathematical model reflecting one or more physical and/or biological processes in the products. Prevents or reduces the quality degradation of the products in terms of shelf life, appearance or tastiness. Furthermore, a method for controlling the temperature in such a way that effects of scheduled events, such as temperature increase during defrosts, can be compensated prior to the event.
Abstract:
The invention provides a refrigeration system with a compressing unit, and a method of controlling a refrigeration system. To facilitate a better control, the capacity of the compressing unit is controlled based on a predicted future cooling demand rather than an actually determined cooling demand. The invention further provides a system wherein a cost value for changing the cooling capacity of the system is taken into consideration.
Abstract:
Es wird Wärmetauscher (1) angegeben mit einem Gehäuse (1) , in dem eine Primärseite (3) mit einem ersten Strömungspfad (5) zwischen einem Vorlaufanschluß (6) und einem Rücklaufanschluß (7) und eine Sekundärseite (4) mit einem zweiten Strömungspfad (9) zwischen einem Zufluß- anschluß (10) und einem Ablaufanschluß (11) angeordnet ist, und mit einem Ventil (14) zur Steuerung eines Durchflusses eines Wärmeträgerfluids durch die Primärseite (3). Man möchte einen derartigen Wärmetauscher kompakt gestalten. Hierzu ist vorgesehen, daß das Ventil (14) eine Betätigungseinrichtung (15) mit einem Dehnstoffelement (16) aufinreist, das von der Temperatur auf der Sekundärseite (4) beaufschlagt ist.
Abstract:
The invention provides a solenoid actuated valve with a plunger which moves in a sleeve under influence of a magnetic field from the solenoid and further comprising a damping device for reducing noise and wear caused by the plunger when it bounces against a top part located in the sleeve. The damping device comprises a first part (11) which forms the limit of the travel of the plunger and another part (7) which is allowed to move relative to the first part in a dampened movement. To enable application in a vacuum system, the damping device comprises a conduit (29) which allows evacuation of a chamber confined between one end of the sleeve and the damping device. The invention further provides a damper for a solenoid actuated valve.
Abstract:
A micro-analysis system for determining the concentration of a species within a medium is disclosed, said system comprising- storage means for the storage of fluids, comprising at least one first fluid reservoir holding reagent fluid and at least one second fluid reservoir holding carrier fluid, sensing means for collecting species from the medium, said sensing means having an inlet and an outlet, analysing means for determining the concentration of the species in the medium, connecting means, comprising first connecting means for fluid connection between the first fluid reservoir and the analysing means, second connecting means for fluid connection between the second fluid reservoir and the inlet of the sensing means and third connecting means for fluid connection between the outlet of the sensing means and the analysing means, said first connecting means comprising at least one first flow restricting means and said second connecting means comprising at least one second flow restricting means, where a third fluid reservoir holding priming fluid and fourth connecting means for connection between said third fluid reservoir and the inlet of the sensing means are provided. Hereby, the necessary priming time of the system can be dramatically reduced.
Abstract:
A flow control valve includes a valve body defining fluid inlet (18) and outlet (16) sections interconnected by a connecting port (20). A valve unit (40) is disposed in the valve body and is operably connected to an actuator (42) to be moved thereby for opening and closing the connecting port. The valve unit includes a pressure balancing passage which communicates front and rear ends of a valve element (90) with one another and tending to aid in statically and dynamically balancing the fluid pressures acting on the valve element.
Abstract:
Es wird ein Taupunktfüler angegeben. Man möchte auf einfache Weise das Auftreten von Kondensat erfassen können. Der Taupunktfühler (7) weist ein mit eine Wärmeträgermedium wärmeleitend in Verbindung stehendes Gehäuseteil (8) auf, das eine Kondensat bildende Oberfläche (9) aufweist, und ein vom Kondensat der Oberfläche beaufschlagbares Sensorelement (16), dessen Raumausdehnung sich bei einer Kondensat-Beaufschlagung ändert.
Abstract:
The invention concerns a valve arrangement (1) with a housing (2), an inlet connection (3) and an outlet connection (4), which are connected with each other via a flow path, in which is located a closing device (5), which has a valve seat (7) and a valve element (6) interacting with the valve seat (7), the valve element (6) being loaded in the direction of the valve seat (7) by a resetting device (8) and being acted upon on the side facing the valve seat (7) by a pressure in a first pressure chamber (9), said pressure corresponding to the pressure in the inlet connection (3), when the closing device (5) is closed, and on the side facing away from the valve seat (7) by the pressure in a second pressure chamber (11), which is connected with the outlet connection (4) via a channel arrangement (14), in which is located at least one auxiliary valve (15), and with the first pressure chamber (9) via a throttle (13). It is endeavoured to reliably ensure that the closing device (5) opens. For this purpose, it is provided that the channel arrangement (14) ends in a suction nozzle arrangement (18), which is located in the flow path.
Abstract:
The invention provides an indicator for indicating a pressure difference. The indicator has a reference pressure chamber with two flexible wall parts being influenced to deflect upon pressures P1 and P2. The deflection of the wall parts changes a distance between each of the wall parts and an inflexible wall part of the chamber and by inspecting the difference, a pressure difference between P1 and P2 can be determined. To enable visual inspection, the chamber can be filled with an optically detectable fluid and one of the wall parts could be transparent to allow visual reading by determining a colour of the fluid layer below the transparent part.