The solar water heater is composed of a heat collecting component (a vacuum tube type is a vacuum heat collecting tube, a flat type is a flat plate collector), a heat insulating water tank, a bracket, a connecting pipe, and a control component.
First, the collector
The heat collecting element in the system. Its function is equivalent to the electric heating pipe in the electric water heater. Unlike electric water heaters and gas water heaters, solar collectors
The solar water heater uses the radiant heat of the sun, so the heating time can only be when the sun illuminance reaches a certain value.
At present, the most common in the Chinese market is the all-glass solar vacuum collector. The structure is divided into an outer tube and an inner tube, and the outer wall of the inner tube is plated with a selective absorption coating. The collector plate of the flat plate collector is coated with a heat absorbing film such as black chrome, and the metal tube is welded on the heat collecting plate. The flat plate collector is slightly more expensive than the vacuum tube collector, and the flat plate collector has an upward trend in recent years. Especially in the high-rise residential balcony solar water heaters have a unique advantage. The all-glass solar collector vacuum tube is generally made of high borosilicate 3.3 special hard glass, and the selective heat absorption film is vacuum sputtering selective coating process.
Second, the insulation tank
A container for storing hot water. The hot water collected by the heat collecting tube must be stored in the insulated water tank to prevent heat loss. The capacity of a solar water heater refers to the water capacity that can be used in a water heater, and does not include the capacity that cannot be used in a vacuum tube. For a pressurized solar water heater, its capacity refers to the capacity of the medium in which heat exchange can occur.
The solar water heater insulation tank consists of three parts: the inner tank, the insulation layer and the water tank shell.
The tank liner is an important part of storing hot water, and its material strength and corrosion resistance are essential. There are stainless steel, enamel and other materials on the market. The quality of the insulation layer insulation material is directly related to the insulation effect, which is especially important in the cold season. At present, the better insulation method is the polyurethane foaming process. The outer casing is generally a color steel plate, an aluminum-zinc plate or a stainless steel plate.
The insulation tank requires good insulation effect, corrosion resistance and clean water.
Third, the bracket
A shelf that supports the collector and the insulated water tank. Requires a firm structure, high stability, resistance to wind and snow, aging resistance, and no rust. The material is generally sprayed with stainless steel, aluminum alloy or steel.
Fourth, the connection pipeline
The solar water heater firstly enters the cold water into the hot water storage tank, and then transfers the heat to the heat preservation water tank through the heat collector. The hot water tank is connected to the indoor cold and hot Water Pipes, so that the whole system forms a closed loop. A well-designed, properly connected solar line is critical to the ability of the solar system to achieve optimal operation. The solar energy pipeline must be insulated, and the cold area in the north needs to be installed on the outer wall of the pipeline to ensure that the user can use solar hot water in the cold winter.
Five, control components
General household solar water heaters need to operate automatically or semi-automatically. The control system is indispensable. The commonly used controllers are automatic water supply, water full water and water temperature and water level. Solar water heaters with auxiliary heating are also protected by electric leakage, anti-drying, etc. Features. At present, there are intelligent solar water heaters controlled by mobile phone short messages on the market, which have the functions of water level water level inquiry, fault alarm, start water supply, turn off water supply, start electric heating, etc., which is convenient for users.
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