The heat pipe is very efficient at moving heat

The heat pipe is very efficient at moving heat because, when compared to liquid, the gas carries energy called the latent heat of vaporization; this latent (or hidden) heat is released at the top of the pipe, where it makes contact with a transfer material.

These are a bit more sophisticated. They look like a row of side-by-side fluorescent strip lights, except that they absorb light rather than giving it out. 

Each tube in the row is actually made of two glass tubes, an inner one and an outer one, separated by an insulating vacuum space (like vacuum flasks). 

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