Frost Damage in Heat Pipes

German manufactured products are famous for being rigorously tested. One of the leading test institutes is TUV Rheinland which has a special expertise in testing thermal solar evacuated tubes. Evacuated tube solar collectors were originally designed by Dornier in Germany. There are various kinds of evacuated tubes but one popular and expensive kind is the tube which contains a heat pipe – a sealed pipe which usually contains a fluid which expands and contracts according to the heat and delivers heat through a manifold through which a freeze resistant glycol is passed as a heat exchange medium. Continue reading