Comparing Types of Solar Water Heating Systems
There are three main types of solar water heating systems commercially available.
Sealed Solar Heater
The first system and most basic is a sealed solar heater. This is a whole heater combining gathering heat and accumulating heat into one, which is generally made up of two to three round tubes painted black. The black coating absorbs heat, which warms the water.
Flat-panel Solar Water Heater
The second type of system is flat-panel solar water heater. It is made up of a panel and heat collecting water tank, and generally runs in natural circulatory style. The flat-panel heat collector consists of the panel for absorption of heat, a transparent cover, an insulating layer for back and side face, and the framework.
Vacuum Tube Water Heater
The third type of system is vacuum tube water heater. It usually adopts natural convection for exchanging heat, which is made up of several glass vacuum tubes for heat collection inset directly into the water tank. There is silica gel band between each vacuum tube for collecting heat and the hole of water tank. The vacuum tube transfer heat through super conductor in the copper heat tube rather than water, so the rate of heating is high.
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