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Vacuum tube solar water heater: solar radiation passes through the outer tube of the vacuum tube, and then is absorbed by the heat collecting coating and transferred to the water in the tube along the inner tube wall. At this time, the water is heated and the temperature gradually rises, and the specific gravity decreases and rises, forming an upward force, forming a thermal siphon system. As the hot water continues to move up and is stored in the upper part of the water tank, the water with lower temperature is continuously replenished along the other side of the tube. This cycle repeats, and eventually the whole tank of water rises to a certain temperature. Flat plate solar water heater: the medium circulates naturally in the heat collecting plate due to thermal siphon, and then transfers the solar radiation heat to the water tank in time. The medium can also transfer heat through pump circulation, so there is a constant supply of energy to keep the water temperature stable. In the vacuum tube solar water heater with direct plug-in structure, hot water is powered by gravity; however, the flat plate type is powered by the pressure of tap water. However, both of these solar centralized heating systems use pump circulation. Since the solar water heater has a small heat collection area, considering the heat energy loss, pipeline circulation is generally not used.
Vacuum tube solar water heater: solar radiation passes through the outer tube of the vacuum tube, and then is absorbed by the heat collecting coating and transferred to the water in the tube along the inner tube wall. At this time, the water is heated and the temperature gradually rises, and the specific gravity decreases and rises, forming an upward force, forming a thermal siphon system. As the hot water continues to move up and is stored in the upper part of the water tank, the water with lower temperature is continuously replenished along the other side of the tube. This cycle repeats, and eventually the whole tank of water rises to a certain temperature. Flat plate solar water heater: the medium circulates naturally in the heat collecting plate due to thermal siphon, and then transfers the solar radiation heat to the water tank in time. The medium can also transfer heat through pump circulation, so there is a constant supply of energy to keep the water temperature stable. In the vacuum tube solar water heater with direct plug-in structure, hot water is powered by gravity; however, the flat plate type is powered by the pressure of tap water. However, both of these solar centralized heating systems use pump circulation. Since the solar water heater has a small heat collection area, considering the heat energy loss, pipeline circulation is generally not used.
