Abstract:
The invention provides a method of making a component (1) from first and second parts (2, 3) which are joined in a welding process wherein a laser beam is transmitted in a direction from a laser source and at least partly into a gap (16). The gap is made between edges (8, 9) of the component (1), and to enable a faster laser welding process, the laser has a focus point (33, 34) size which is at least of the size of the gap. To enable better control of the width of the gap, the invention further provides a method and components (1) wherein one part (2) is formed with a neck (5) which extends into a complementary socket (7) of the other part (3) to prepare the parts for the welding process. The invention in particular concerns welding of brass.
Abstract:
The invention provides a method of making a component (1) from first and second parts (2, 3) which are joined in a welding process wherein a laser beam is transmitted in a direction from a laser source and at least partly into a gap (16). The gap is made between edges (8, 9) of the component (1), and to enable a faster laser welding process, the laser has a focus point (33, 34) size which is at least of the size of the gap. To enable better control of the width of the gap, the invention further provides a method and components (1) wherein one part (2) is formed with a neck (5) which extends into a complementary socket (7) of the other part (3) to prepare the parts for the welding process. The invention in particular concerns welding of brass.
Abstract:
A method for controlling a vapour compression system (1) comprising two or more evaporators (5, 12), each evaporator (5, 12) being arranged in thermal contact with a refrigerated volume, and each evaporator (5, 12) receiving refrigerant via an expansion device (6, 13) is disclosed. In response to receipt of a load shedding command originating from a power grid (17), the vapour compression system (1) reduces a compressor capacity of the compressor unit. The refrigerated volumes are divided into at least two prioritized categories of refrigerated volumes, where a first category (18) includes refrigerated volumes with temperature critical storage, and a second category (19) includes refrigerated volumes with temperature non-critical storage. Refrigerant supply to the evaporator(s) (5, 12) being in thermal contact with the refrigerated volume(s) of the second category (19) is discontinued, and refrigerant supply to the evaporator(s) (5, 12) being in thermal contact with the refrigerated volume(s) of the first category (18) is continued. Thereby the vapour compression system (1) is capable of providing load shedding services for an extended period of time without compromising temperature critical storage.
Abstract:
A method for operating a vapour compression system (1) is disclosed. The vapour compression system (1) comprises a compressor (2), a condenser (3), at least one expansion device (4), an evaporator (5), said evaporator (5) comprising at least two evaporator paths (5a, 5b) arranged fluidly in parallel, and a distribution device arranged to distribute refrigerant among the evaporator paths (5a, 5b). 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 (5a, 5b), detecting one or more operational settings of the vapour compression system (1), selecting one of the at least two predefined distribution keys, based on said detected operational setting(s), and distributing refrigerant among the evaporator paths (5a, 5b) in accordance with the selected predefined distribution key. The predefined distribution keys constitute pre-settings which can be selected on the basis of operational settings, such as compressor capacity, fan speed, refrigeration load or mode of operation. The vapour compression system (1) may be operated in accordance with the selected predefined distribution key, or the selected predefined distribution key may be used as a suitable starting point for an adaptive adjustment of the distribution key. An optimal distribution of the available refrigerant among the evaporator paths (5a, 5b) is quickly reached due to the pre-settings. Thereby the vapour compression system (1) can be operated in an optimal manner for most of the operating time.
Abstract:
The invention provides a method of making a component (1) from first and second parts (2, 3) which are joined in a welding process wherein a laser beam is transmitted in a direction from a laser source and at least partly into a gap (16). The gap is made between edges (8, 9) of the component (1), and to enable a faster laser welding process, the laser has a focus point (33, 34) size which is at least of the size of the gap. To enable better control of the width of the gap, the invention further provides a method and components (1) wherein one part (2) is formed with a neck (5) which extends into a complementary socket (7) of the other part (3) to prepare the parts for the welding process. The invention in particular concerns welding of brass.
Abstract:
A valve (4) for a refrigeration system. Comprises two diaphragms (8, 10) being operatively connected. One diaphragm (8) is in contact with the refrigerant, the other (10) is in contact with the filling fluid. The two diaphragms (8, 10) may have different active areas. In combination with the connection between the two diaphragms (8, 10) this provides a `pressure gearing' between the filling fluid and the refrigerant. Allows the pressure of the filling fluid to be relatively low even when the pressure of the refrigerant is high, while ensuring that the valve (4) can function properly. Particularly suitable for high pressure refrigeration systems, such as CO2 systems.
Abstract:
The invention describes energy cost saving potentials in a food retail system in context with a smart grid system utilising thermal storage and heat recovery technology. The invention is based on case examples and theoretical studies to describe the technology advantages. To obtain the cost optimisation in complex refrigeration systems, a method for minimisation of cost is described.
Abstract:
An expansion valve (1) comprising an inlet opening and at least two outlet openings (5) is disclosed. The inlet opening is adapted to receive fluid medium in a liquid state, and the outlet openings (5) are adapted to deliver fluid medium in an at least partly gaseous state. The expansion valve (1) further comprises a diaphragm (6), and at least two valve seats (4), each valve seat (4) being fluidly connected to one of the outlet openings (5). Each of the valve seats (4) forms a valve in combination with the diaphragm (6), the position of the diaphragm (6) thereby simultaneously defining an opening degree of each of the valves. A well defined distribution of fluid flow towards each of the outlet openings (5) is easily defined by movements of the diaphragm (6). The distribution takes place before or during expansion of the fluid medium. The expansion valve (1) may be arranged in an refrigerant path of a refrigeration system.
Abstract:
The invention relates to a cooling system comprising a coolant circuit which comprises several evaporator paths and a distributor (5) which distributes the coolant on the evaporator paths. The aim of the invention is to improve the operation of said cooling system in a simple manner. According to the invention, the distributor (5) comprises a controllable value (12) for each evaporation path.