If there is only slight rust on the surface of the water tank, you can use sandpaper to smooth the rusty area, and then apply a coat of anti-rust paint. If the outer shell has rusty holes, it is recommended to replace it. the water tank with a new one.
The solar water heater is a heating device that converts solar energy into thermal energy, heating water from low temperature to high temperature to meet the use of hot water by people in life and production. Solar water heaters are divided into vacuum tube solar water heaters and flat plate solar water heaters based on their structural shapes. Evacuated tube solar water heaters are mainly used.
Working principle
Sunlight passes through the first glass layer of the heat-absorbing tube and shines on the black heat-absorbing layer of the secondth layer of glass, absorbing heat from solar energy. The glass layers are vacuum insulated, so heat transfer will be significantly reduced (radiant heat transfer still exists, but there is no thermal conduction or thermal convection). The glass tube, causing the water to flow into the glass tube. When the water is heated, the heated water becomes lighter and flows upward along the heating surface of the glass tube into the insulated water storage bucket. The relatively low temperature water in the bucket enters. the glass tube along the backlight surface of the glass tube for replenishment. This continuous cycle causes the water in the insulated water storage bucket to be continuously heated to achieve the hot water target.
Components
Heat sensor
The heat collecting element in the system. Its function is equivalent to the electric heating tube of the electric water heaterelectric. Unlike electric water heaters and gas water heaters, solar collectors use radiant heat from the sun, so the heating time can only be carried out when the solar irradiation reaches a certain value.
At present, the all-glass vacuum solar collector tube is the most popular in the Chinese market. The structure is divided into an outer tube and an inner tube, and the outer wall of the inner tube is covered with a selective absorption coating. The collector panels of flat plate collectors are covered with heat-absorbing films such as black chrome, and metal tubes are welded to the collector plates. The cost of flat plate collectors is slightly higher than that of vacuum tube collectors. Plate collectors have shown an increasing trend and especially have unique advantages in balcony-type solar water heatersfor high-rise residential buildings. All-glass solar collector vacuum tubes are generally made of extra hard high borosilicate 3.3 glass, and the selective heat absorption film adopts selective vacuum spray coating process.
Insulated water tank
A container for storing hot water. The hot water collected by the collector tube should be stored in an insulated water tank to avoid heat loss. The capacity of a solar water heater refers to the capacity of water that can be used in the water heater, excluding the capacity that cannot be used in the vacuum tube. For pressurized solar water heaters, its capacity refers to the capacity of the medium in which heat exchange can take place.
The insulated water tank of a solar water heater is composed of three parts: an inner tank, an insulating layer and a cockue of the water tank.
The water tank liner is an important part of hot water storage, and the strength and corrosion resistance of its materials are crucial. There are stainless steel, enamel and other materials on the market. The quality of the insulation material of the insulation layer is directly related to the insulation effect, which is particularly important in the cold season. The best insulation method is overall insulation by polyurethane foaming. The shell is usually made of colored steel sheet, galvanized sheet or stainless steel sheet.
The insulated water tank requires good insulation effect, corrosion resistance and clean water quality.
Support
Supports supporting the collector and the insulated water tank. It must have a solid structure, high stability, wind and snow resistance, aging resistance and no rust. Materiau is usually stainless steel, aluminum alloy or powder-coated steel.
Connecting pipes
The solar water heater first enters cold water into the hot water storage tank, then transfers the heat to the insulated water tank via the collector. The hot water storage tank is connected to the indoor cold and hot water pipes, allowing the entire system to form a closed loop. Properly designed and properly connected solar pipes are essential for optimal solar system operation. Solar pipes must be insulated. In cold northern regions, heating tape should be laid on the outer walls of pipes to ensure that users can use solar hot water during cold winters.
There are two types of water leakage from the water storage barrel of the solar water heater:
1. Water leaking from the joints between the vacuum tube and the bodyof the barrel.
Solution: Replace the sealing ring.
2. The cannon is leaking.
This has virtually no maintenance value. The structure of the barrel itself is double-layered. The inner layer is a water storage barrel and the outer layer is a shell. Insulating materials are added between the two layers using foaming technology. If you want to repair, the foam insulation must be destroyed, and the walls of water storage barrels are relatively thin and difficult to weld and repair. After repair, the insulating material must be filled. So the maintenance value of this is not great. Fixing it may not save you much money compared to buying a new one.
Solution: Replace barrel or replace solar.
Detailed information:
The solar water storage barrel is a container for store hot water. L'Hot water collected by the collector tube should be stored in an insulated water tank to avoid heat loss. The capacity of a solar water heater refers to the capacity of water that can be used in the water heater, excluding the capacity that cannot be used in the vacuum tube. For pressurized solar water heaters, its capacity refers to the capacity of the medium in which heat exchange can take place.
The insulated water tank of a solar water heater is composed of three parts: an inner tank, an insulating layer and a water tank shell.
The water tank liner is an important part of hot water storage, and the strength and corrosion resistance of its materials are crucial. There are stainless steel, enamel and other materials on the market. The quality of the insulating material of the insulating layer is directly related to the insulating effect, which is particularespecially important during the cold season. The best insulation method is overall insulation by polyurethane foaming. The shell is usually made of colored steel sheet, galvanized sheet or stainless steel sheet.
The insulated water tank requires good insulation effect, corrosion resistance and clean water quality.
Reference link: Solar water heater Baidu Encyclopedia