Abstract: The invention relates to a liquid cooling system comprising a cooling unit and a liquid loop in which the liquid is arranged to be conveyed from a supply outlet of the cooling unit to a radio unit where the liquid is arranged to cool the radio unit before being conveyed back in the liquid loop to a return inlet of the cooling unit, the cooling unit being arranged located at a distance from the radio unit, wherein the cooling unit is an expandable cooling unit comprising a secondary outlet and a secondary inlet where, when an additional cooling unit of the liquid cooling system is connected with an inlet to said secondary outlet and with an outlet to said secondary inlet, the liquid is arranged to be fed from the cooling unit through the secondary outlet to the additional cooling unit arranged to also cool the liquid.

Abstract: A cooling device comprising a rotating part (1) provided with an internal space (3) intended for the transport of cooling liquid and provided with external fins (4) intended for the transport of gas along at least a section of the rotating part. The rotating part is symmetrical in rotation and revolves around an axis of rotation (2). The rotating part comprises a cooling liquid pump section (5), a fan section (6), and between these an intermediate section (7) arranged around the axis of rotation, where the fan section has a basic shape of a radially extended plate (15), wherein the flow of cooling liquid enters at the pump section from an object to be cooled, proceeds through the intermediate section and turns back in the vicinity of the periphery (17) of the fan section, in order to once again pass the intermediate section and then be pumped back to the object by means of the pump section.

Abstract: A structure for housing electronic equipment, for example outdoor telecom applications such as radio base stations, in a climate-controlled environment. The structure comprises a compact climate-control unit adapted for integration into the structure. The climate system provides for circulation of air in an internal closed circuit for cooling of heat generated by the electronic units within a closed space within the interior of the structure.

Abstract: In cooling electrical devices (205) a Laval nozzle, is used for obtaining a cooling effect. The nozzle can be located close to the electrical device (205), which it is intended to cool, whereas the unit (209) supplying the nozzle with air, for example a fan or a compressor, can be located at another location. This is very advantageous when the electrical devices (205) to be cooled are located at locations hard to reach or access, such as in the top of antenna (201). The supplying unit (209) can then be located at the foot of the antenna where repair and service is easy to carry out.

Abstract: A method and means for arranging heat transport, i.e. cooling or heating, of electrical components, are disclosed. Embodiments of the invention show how one or several flexible tubes (130) are arranged in connection with units (101) comprising electrical components. The units (101) can be enclosed in cabinets (100). The tube (130) can be arranged in a zigzag pattern around the units (101) and pressurized by a fluid from a combined pump and heat exchanger (103). The pressure expands the wall of the tube (130), thus creating thermal contact with the units (101). By flowing fluid in the tube (130) heat can be transported from or to the units (101). Tubes (130) arranged in several cabinets (100) can be connected, either in series or in parallel.

Abstract: A method and apparatus for the transfer of mass with the aid of rotating surfaces. The fluid with which an exchange or transfer is to be made is introduced in parallel in one or more gaps or channels defined between the rotating surfaces. Rotation of the surfaces causes the major part of the fluid flow to pass through a rotating, flow mechanical boundary layer adjacent the rotating transfer surface in laminar or turbulent flow.

Abstract: A cooling system for telecommunications equipment. Components which emit most heat, such as power units, radio transmitters, final stages and the like, are mounted in a first cabinet space, while remaining components that emit less heat are mounted in a second hermetically closed space. The first space is cooled with circulation air which enters the system from ambient and flows through channels or like conduits past the components in the first space. The second space is cooled with air that circulates through a heat exchanger mounted in the first space. The components that emit the most heat are housed in hermetically closed boxes that are preferably EMC-shielded against the surroundings and that have heat sinks mounted on the outside thereof. Air may be circulated through the first space, the second space, and through the heat exchanger with the aid of a fan. The air circulated through the first space flows in counter direction relative to the air circulated through the heat exchanger.

Abstract: An intra-cell handover method in a cellular communication system which utilizes spatial information from an antenna array is disclosed. The spatial information is measured with the antenna array. A determination is then made on whether an intra-cell handover is desirable for a mobile station based upon said measured spatial information. The mobile station is then handed over from a first channel to a second channel when desirable and spatial filters in transceivers for mobile stations using the first and second channels are computed based on the spatial information.

Abstract: A method and apparatus for the transfer of heat with the aid of rotating surfaces. The fluid with which an exchange or transfer is to be made is introduced in parallel in one or more gaps or channels defined between the rotating surfaces. Rotation of the surfaces causes the major part of the fluid flow to pass through a rotating, flow mechanical boundary layer adjacent the rotating transfer surface in lamellar or turbulent flow.