A loop heat pipe is like a straw that moves heat instead of liquid. Imagine you have a hot potato and you want to move it to your friend without touching it with your hands. Instead, you use a straw to move the heat from your hot potato to your friend.
Now, in the same way, a loop heat pipe moves heat from one thing to another without touching it. It's used in machines and computers to keep them cool. Just like we need water in a straw to move it around, loop heat pipes use a special kind of liquid called a working fluid.
The working fluid goes through a loop or a circuit and picks up heat from the hot parts of the machine. Then, it moves to a cooler part where it drops the heat and becomes cool again. After that, it goes back to the hot parts to pick up heat again. It keeps moving like this to keep the machine cool.
So, in other words, loop heat pipes are like tiny tunnels that move heat without touching the hot parts of a machine. They use a special fluid that moves in a circuit to pick up heat and release it somewhere else, so that machines stay cool and work properly.