Heat emitted by highly compacted electronic equipment becomes a limiting factor for its performance. If the heat is not conducted outside the device, it can cause the device overheating and, ultimately, its failure. To avoid such unwanted events, passive devices called heat pipes are used. The heat emitted by the circuits of laptops and smartphones is relatively small and can be managed by capillary heat pipes. They are however unsuitable for more powerful electronics onboard the communication satellites. One can use for this purpose a novel device called pulsating heat pipe (PHP), which is simply a capillary tube that forms a closed loop that meanders between a hot spot to be cooled and a heat radiator. The tube is partially filled by a pure fluid that forms inside vapor bubbles separated by liquid plugs. When the heat power is applied, evaporation and condensation alternate causing oscillation of the whole bubble-plug pattern. The heat amount is efficiently transferred due to both latent and convective heat exchange.