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.