Abstract:
A method for operating a vapour compression system (1) is disclosed. The vapour compression system (1) comprises a compressor (2), a condenser (3), an expansion device (4), e.g. in the form of an expansions valve, and an evaporator (5) arranged along a refrigerant path. The method comprises the steps of: obtaining a superheat value being representative for the superheat of refrigerant entering the compressor (2); obtaining a subcooling value being representative for the subcooling of refrigerant entering the expansion device (4); and operating the expansion device (4) on the basis of the obtained superheat value and on the basis of the obtained subcooling value. It is an advantage that the subcooling value is taken into account when operating the expansion device (4), because variations in the subcooling value has significant influence on the refrigerating capacity of the evaporator (5) at a given opening degree of the expansion device (4). A more stable operation of the vapour compression system (1) is therefore obtained when taking the subcooling value into consideration. The vapour compression system (1) may advantageously further comprise an internal heat exchanger (6), e.g. in the form of a suction line heat exchanger.
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:
This invention relates to objects having a corrosion resistant surface improving the overall corrosion resistance of the object relative to the core material, preferably being titanium or titanium based. The surface layer preferably contains at least 80% of a refractory metal such as tantalum, or an alloy based on one or more refractory metals, To ensure a good adhering of the surface to the base material an alloy layer is created between a core element and the surface layer having a thickness at least twice that of the surface layer, where the alloy layer itself has corrosion resistant properties.
Abstract:
The invention provides a method and a system for controlling floor heating or climate regulating systems with long time constants. According to the invention, a flow of a fluid is provided through the floor or through a similar medium with large thermal inertia. An induced heat is determined by adding up a plurality of differences between an inlet temperature of the fluid when it enters the medium and an outlet temperature of the fluid when it leaves the medium. The temperatures are sampled with a fixed sampling time and within a fixed period of time, and a corresponding change in temperature of the medium over the fixed period of time is determined. In the future, the temperature of that medium is controlled by use of a ratio between the induced heat and the change in temperature.
Abstract:
A flow system (1) comprising a first part (2) and a second part (3), the parts (2, 3) being made from materials having different coefficients of thermal expansion. The first (2) and second (3) parts are positioned relatively to each other in such a way that when the ambient temperature changes corresponding changes are caused in a flow channel (4) formed in the first part (2), thereby changing the flow resistance of the flow channel (4). Thereby a change in flow resistance caused by a change in viscosity of a fluid being transported by the flow system (1) can be counteracted. The resulting flow resistance of the flow system (1) is thereby at least substantially independent of the ambient temperature. Furthermore, a micro fluidic system comprising the flow system (1). The micro fluidic system may be or form part of a medical device, a fluid analysis system, e.g. a device for measuring blood glucose levels of blood samples, or an infusion device.
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:
A method and a device for detecting an abnormality of a heat exchanger exchanging heat between a first fluid flow flowing in a conduit and a second fluid flow flowing along a flow path, said conduit and said flow path each having an inlet and an outlet, whereby the method comprises the steps of: establishing at least one parameter representative of the temperature conditions of the heat exchanger, establishing a second fluid inlet temperature, establishing a parameter indicative of expected heat exchange between the heat exchanger and the second fluid, processing the heat exchanger temperature, the second fluid temperature and the parameter indicative of expected heat exchange for establishing an estimated second fluid outlet temperature, employing the estimated second fluid outlet temperature for evaluating the heat exchange between the first and second fluids by comparing the estimated second fluid outlet temperature, or a parameter derived therefrom, with a reference value.
Abstract:
An infusion device for continously infusion of medication is disclosed, in which infusion is controlled over two separate fluid communications. The infusion is in each fluid communication controlled by restricting means and valve means, and one of the fluid communications further contains a holding device for bolus rate of infusion for a short period. The devide comprises a flow regulating device comprising a passage defined by at lesat a first element is a primary deformable element adapted to be elastically deformed so as to change the cross sectional area of the passage. Furthermore the device comprises a container for storage and supply of a medication in fluid form, said container comprising a first and a second chamber being arranged relatively to each other so that when volume of the first chamber increases the volume of the second chamber decreases.
Abstract:
An operating element is disclosed, comprising a body made from an elastomeric material, with an electrode arrangement (3) provided on each of the two opposing limiting surfaces, of which at least one comprises several first electrodes (7) penetrating the limiting surface in a perpendicular direction (6) thereto. The aim of the invention s to improve the dynamics of such an operating element. Said aim is achieved, whereby the electrode arrangement (3) comprises second electrodes (9), several of which are located in spaces (8, 8a, 8b) between neighbouring first electrodes (7) connecting the same, whereby the second electrodes (9, 9') in neighbouring spaces (8a, 8b) are arranged offset from each other.
Abstract:
An arrangement (1) for decreasing galvanic corrosion between metal components, which comprises at least a first component (2) in which a first metal is a part, and at least a second component (3) in which a second metal is a part, whereby the first metal has a higher normal-electrode potential (e ) than the second metal. The first component (2) is intended, after mounting, to be in electrical contact with the second component (3). Thereby according to the invention the first component (2) is coated with a substantially continuous surface layer (4), being adjusted to give the second component (3) an insignificant galvanic corrosion velocity after mounting. The invention is preferably applied in association with attachment elements such as bolt or screw joint reinforcements, which comprise a more noble metal than the component or the components, which the attachment element should be in contact with after mounting, and is particularly, preferred for vehicle components.