How many kinds of solar water heaters are there?

Types of solar water heaters Solar water heaters can be roughly divided into the following categories:

1, from the heat collection part:

(1) glass vacuum tube solar water heater: it can be subdivided into all-glass vacuum tube type, heat pipe vacuum tube type, U-tube vacuum tube type/vacuum tube heat storage integrated stuffy dry type. All-glass vacuum tubes are commonly used, which have the advantages of safety, energy saving, environmental protection and economy. In particular, the solar water heater with auxiliary electric heating function is mainly solar energy, supplemented by electric energy, which makes the solar water heater run normally all year round, and the efficiency is still relatively high under the condition of low ambient temperature. Its disadvantages are relatively large volume, fragile glass tube, easy fouling in the tube and inability to operate under pressure.

(2) Flat solar water heaters can be divided into tube plate type, wing tube type, snake tube type, flat box type, round tube type and heat pipe type. Its advantages are good integrity, long service life, few faults, low potential safety hazard, pressure-bearing operation, safety and reliability, large area of heat absorber, easy combination with buildings, strong anti-drying air performance and stable thermal performance. Its disadvantage is that the cover plate is non-vacuum, so the heat collection performance is poor when the ambient temperature is low, and the auxiliary heating consumes more electricity. When the ambient temperature is low or the required outlet temperature is high, the thermal efficiency is low. If it is damaged by freezing, it is necessary to replace the whole collector plate, which is suitable for the southern region where it is not frozen in winter.

(3) Ceramic hollow flat-panel solar water heater: Ceramic solar panels are hollow thin-walled flat-panel box-type solar collectors with ordinary ceramics as the matrix and solid netted vanadium-titanium black porcelain as the surface layer. Ceramic solar panels are made of ceramic materials, which are impervious to water and water, high in strength and rigidity, non-corrosive, non-aging, non-fading, non-toxic, harmless and non-radioactive, and the absorption rate of sunlight will not be attenuated, so it has long-term high photothermal conversion efficiency.

Tested by the National Solar Water Heater Quality Supervision and Inspection Center, the solar absorption rate of ceramic solar panels is 0.95, and the daily heat gain of concrete structure ceramic solar roof is 8.6MJ, which is much higher than the national standard. Ceramic solar panels have low manufacturing and use costs, and the sunlight absorption rate is not attenuated, and the service life is the same as that of buildings. It can be used for concrete structure ceramic solar roofs, sunshine walls and balcony guardrails, as the structural layer, thermal insulation layer and waterproof layer of the original roof, with simple structure and better thermal insulation effect than the original roof and building, and provides hot water, heating and air conditioning for the building. Provide heat energy for industry, agriculture and aquaculture; It can be used for large-scale solar hot water power generation in desert, wind tunnel power generation, seawater desalination, brackish water desalination and desert to farmland.

2, from the structure of classification:

(1) Compact solar water heater: The vacuum glass tube is directly inserted into the water tank to increase the water temperature of the water tank through the circulation of heated water. This is the most conventional solar water heater on the market.

(2) Split water heater: Split water heater separates the collector from the water tank, which can greatly increase the capacity of solar water heater, and does not adopt drowning mode, thus expanding the application scope.

3, from the tank pressure to points:

(1) Pressure-bearing solar water heater: The outlet water of the solar water heater is under pressure. Generally, it is a top-water work, and it is not necessary to use a confined water tank.

(2) Non-pressure-bearing solar water heater: Ordinary solar water heaters belong to non-pressure-bearing water heaters, and their water tanks have a pipeline communicating with the atmosphere, which uses the height difference between the roof and the home to generate pressure when using water. Its safety, cost and service life are much more remarkable than that of the pressure-bearing type.

Solar water heater is a device that converts solar energy into heat energy and heats water from low temperature to high temperature to meet the needs of hot water in people's life and production. Solar water heaters are divided into vacuum tube solar water heaters and flat plate solar water heaters according to their structural forms, with vacuum tube solar water heaters as the main one, accounting for 95% of the domestic market share. Vacuum tube household solar water heater consists of collector tube, water storage tank, bracket and other related parts. The conversion of solar energy into heat energy mainly depends on the vacuum collector tube, and the principle of hot water floating and cold water sinking is used to make the water produce microcirculation and reach the required hot water.