Heat pipes might seem like a new concept, but you are probably using them every day and don't even know it.  Laptop computers often using small heat pipes to conduct heat away from the CPU, and air-conditioning system commonly use heat pipes for heat conduction.  solar collectors they are used to transfer heat from within the evacuated tube up to the header pipe that is housed in the insulated manifold box. 。Evacuated tube solar collectors convert energy from the sun into usable heat in a solar water heating system. This energy can be used for domestic and commercial hot water heating, pool heating, space heating or even air conditioning.