This is a question that a friend left me a message for, and I believe this is also a question that everyone is more concerned about.
The reason why everyone has this concern is that we need to go back to twenty or thirty years ago, when solar water heaters were all the rage and almost every household used them. The more people use it, the more problems there are, and there are frozen tubes in every region in winter. So why do you freeze tubes?The reason for the freezing of this tube has lost its vacuum, our vacuum tube is divided into two layers of intermediate vacuum, just like the old-fashioned thermos flask, under normal circumstances, there is no freezing tube with a thermal insulation layer. When the vacuum tube loses the vacuum, it also loses the heat preservation function, and the water in the gate will freeze in the cold night, and the water will expand when it freezes, so that our tube will freeze bad, which is also the reason why the frozen tube is often frozen and the other tubes are not a problem.
Having said all this, back to our heating system, our heating system uses emptying technology, and there is no water inside the vacuum tube at night. The vacuum tube without water is not afraid of freezing, it belongs to glass products, just like our glass water cup, without water, the glass glass is placed outdoors at minus ten or twenty degrees, even if it is minus thirty or forty degrees, it will not freeze. In other words, even if a few tubes lose their vacuum, our system will not freeze the tubes.