What Are The Classifications Of Solar Water Heaters?

- Dec 05, 2020-

Solar water heaters are classified into vacuum tube solar water heaters and flat-plate solar water heaters according to their structure. Solar water heaters convert sunlight energy into heat energy and heat water from low temperature to high temperature to meet people's hot water use in life and production.


The advantage of the solar water heater system is that it can be fully automatic and statically operated, without special supervision, no noise, no pollution, no leakage, fire, poisoning and other dangers, safe and reliable, environmental protection and energy saving.


1. From the heat collection part, it can be divided into: vacuum glass tube solar water heater and metal flat solar water heater.


Vacuum glass tube: It is the heat collection part with the highest heat absorption efficiency at present. The advantage does not need to add an insulation layer in the heat collection part. The current vacuum glass tube has first-class performance in terms of high temperature resistance, shock resistance and insulation. Used by the manufacturer. Disadvantages The volume is relatively large, and it is easy to build up scale in the pipe.


Metal plate: The metal plate with excellent heat transfer performance is covered with a heat-absorbing coating, and the heat transfer of the metal is used to transfer the absorbed heat to the water tank. Advantages Beautiful appearance, easy installation, can be made into a flat plate, and not easy to damage. Disadvantages: Insulation costs a lot, and the cost is high, which indirectly increases the burden on consumers.


2. From the structure, it can be divided into: ordinary solar water heater and split solar water heater.


Ordinary: Insert the vacuum glass tube directly into the water tank, and use the heating water to circulate to increase the water temperature in the water tank, which is currently adopted by manufacturers. It is also popular and most conventional. This type of water heater can only be used on the top floor, unless the relationship between the top user and your downstairs is special, and the roof area is limited.


Split type: Solve the problem that solar water heaters can also be used by users not on the top floor. There are two types of split circulation. One is natural circulation of water, which has low heat exchange efficiency, which is far from meeting water requirements; the other uses pump circulation heat exchange to solve the problem of low natural circulation efficiency. Pump circulation can significantly improve water The heat exchange.


3. From the pressure of the water tank, it can be divided into: pressure-bearing solar water heaters and non-pressure-bearing solar water heaters.


Pressure-bearing type: No matter what kind of split-type water heater, there is a fatal disadvantage. The pressure-bearing water tank must be used. This is the basic idea of all split-type water heaters. It directly tests the sealing performance of the heat collection part; the cost of manufacturing a pressure-bearing water tank is extremely high. There are safety issues, requiring 7 atmospheres withstand pressure; the circulation effect is not very satisfactory. Solve the water circulation and convenience when using water.


Non-pressure-bearing water heaters currently installed on the roof are all non-pressure-bearing water heaters. Its water tank has a pipe connected to the atmosphere. The height difference between the roof and the home is used to generate pressure when using water. The safety cost and the service life are significantly longer than the pressure-bearing type. The roof is limited.


4. According to the water flow direction, it can be divided into: circulation type, direct current type and integral solar water heater.


5. According to the access method, it can be divided into: according to the access method, it can be divided into: dry type, flat type, vacuum tube type, heat pipe type, split type (wall-mounted) {according to the pressure bearing capacity, it can be divided into pressure bearing Type and non-pressure type}, embedded


1) The working principle of the boring type: the water tank is directly irradiated and heated by the glass, one side is heated, and the rest is insulated.


2) Flat plate principle: metal heat absorption, water heat transfer microcirculation


3) Principle of vacuum tube type: the vacuum tube absorbs heat, and the water in the tube is heated through heat transfer and microcirculation of cold and heat to the water tank for storage and insulation.


4) Heat pipe principle: The medium has a low boiling point. After absorbing solar heat, the medium vaporizes and rises, and the condensation section is placed in water. It is cooled in the condensing section and transfers heat. After liquefaction, it descends to the lower part of the tube to continue to be heated, and the cycle works.


5) Split-type principle: After the heat pipe in the vacuum tube is heated, it is cooled by the coil in the water tank and works in circulation.


6) Embedded principle: The hot water valve controls the inlet water pressure and flow rate to ensure the normal operation of the vacuum tube. Inlet cold water pushes out the hot water in the pipe to ensure that users use hot water.


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