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The benefits of solar water heaters are obvious. Energy saving, environmental protection, safety. Terms of its structure can be divided into the following categories:
(1) parts from the solar collectors points:
Vacuum tube solar water heater: is the heat-absorbing part of the most efficient solar collector, its advantage is that no part of the increase in collector insulation, and now the vacuum tube in terms of temperature resistance, insulation resistance and the fight against performance are the best, most solar water heaters have been used by the manufacturer. The disadvantage is that relatively large size, easy to build pipe scale.
Metal plate solar water heater: It is in excellent heat transfer performance of sheet metal, and covered with heat-absorbing coating, the use of metal heat transfer, will absorb the heat transfer in the water tank. The bit is a beautiful appearance, easy installation, can be made flat and not easily damaged. Drawback: the cost of insulation takes great, high cost is to increase the burden on consumers indirectly.
(2) from the structure to Category:
Ordinary solar water heater: the vacuum tube is inserted directly into a water tank, heated by the water cycle, making the water temperature in the tank, which is now manufacturers have adopted. Is one of the most popular to the present conventional water heater. Generally only the top can change the type water heater, unless you downstairs in the top-level relations between users and particularly of iron, and the roof area is limited.
Split Water Heater: Split water heater is to address the top-level users can not use the birth of solar panel. There are 2 split of the cycle, one is by natural circulation of water, this water heater heat exchange efficiency is very low, far from meeting the water requirements; the other is the heat exchange by circulating pump, which is to address the efficiency of natural circulation the low, the use of the pump cycle, can significantly improve the water heat exchange.
(3) from the tank pressure to points:
Pressurized solar water heater: At present, no matter what kind of split-type water heater, there is a fatal flaw, you must use pressurized water tank, which is the basic idea of all split-type solar hot water, which directly test some of your collector sealing performance; also the cost of manufacturing high pressure water tank, there are also security issues, the general requirements of 7 atmospheric pressure; and recycling are not always effective. Although the water cycle to solve problems and ease of use of water.
Non-pressure solar water heater: Currently installed in the roof of the ordinary solar water heaters are a non-pressure type water heaters, water tank it has a pipe open to atmosphere, is the use of the height gap between the roof and at home, use water to stress in the B2B. Its safety, cost, life-style than the ratio of pressure to be significantly more. Unfortunately, the roof is limited.