What is Vacuum Tube Solar Water Heating System & How it Work?
Solar water heating system which uses vacuum tubes made of borosilicate glass with special coating to absorb the solar energy are called as vacuum tube solar water heating system These tubes are also called as evacuated tube collector.(E.T.C) The vacuum tube is an assembly of two concentric, borosilicate glass tubes. The outer surface of inner tube is coated with AI-N/AI by worlds latest innovative coating technology called magnetron sputtering technique. This special selective black coating absorbs maximum sun energy and loses minimum energy. Air between the gap of two glass tube is evacuated which results in high level of vacuum which acts as the best insulation to minimize the heat loss from inner tube. The suns energy is absorbed due to the black coating on inner tube & the same is transferred to the water inside the tube. As the water inside of Vacuum Tube becomes hot it becomes lighter. This causes the heated water to rise to the top of the water tank. At the same time heavier co
