What is the working principle of the flat plate solar water heater and the ordinary solar water heater?
It can be seen that the flat plate solar energy heating medium is usually needed in the work. Vacuum tube solar water supply generally rely on tap water pressure or gravity water pressure, flat plate solar heating medium generally need to use the pump to forced circulation.Comparison of flat plate solar water heater and vacuum tube solar water heater system:Solar water heater thermal efficiency: flat 52.5%, vacuum tube lower than 47%. (thermal efficiency value is 1994-1997 national test average)
In the flat plate solar energy, the heat collector absorbs the heat energy and transfers the heat energy to the heat exchange medium in the heat collector. With the increase of the temperature of the heat conduction medium, under the action of the circulation of the pump, the heated liquid is heated in the heat collector and enters into the heat exchanger of the water storage tank. In this case, the heat energy is transferred to the water, and the cooling medium is cooled. The cooled liquid is then pushed back into the collector. After cooling, the solution is heated in the heat collecting plate and recycled to the heat exchanger, and the heat energy is transferred to the water in the water storage tank. This process is repeated until all the water in the tank is heated.
Ordinary vacuum tube solar water heater, vacuum tube is the core of the solar water heater, his structure is like an elongated thermos bottle container, vacuum between the inner and outer layers. The surface of the inner glass tube is coated with a selective absorption coating by a special process to absorb the solar radiation energy. By sunlight, the photons hit the coating, solar energy into heat energy, water from the outside of the coating absorbs heat, the water temperature increases, the density decreases, the hot water to move up, and more than a significant drop in cold water. Hot water is always on the upper part of the tank. The temperature rise of the hot water in the solar water heater is not related to the outside temperature. When the opening of the kitchen or bath in any of the taps, the water heater in the hot water will rely on natural outflow.
Solar water heater prices: flat high vacuum tube lower.Solar water heater pressure: flat type can be pressure, make the shower convenient, vacuum tube is not pressure, easy to break.Solar water heater scale: flat type water heater can be discharged, not easy to scale, vacuum tube sealing, easy scaling, reduce thermal efficiency.Durability: flat plate type solar water heater with high strength, durable, will not burst, hail a protective cover glass, vacuum tube damage, water, heat pipe vacuum tube suddenly add cold water and explosive, hail damage directly when the vacuum tube itself.
