Automatic control system of solar water heater and control method thereof

Abstract

The invention belongs to the field of solar water heaters and particularly relates to an automatic control system of an solar water heater and a control method thereof. The automatic control system comprises a water storage tank, a main circuit controller, a 220V AC (Alternating-Current) circuit controller and a water delivery pipe, wherein the main circuit controller comprises a central processor, and the central processor is respectively and electrically connected with a water-level detection circuit, a temperature detection circuit, a heating circuit, a light sampling circuit, a water inlet valve control circuit, a water outlet valve control circuit, a display circuit and a keyboard circuit; the water-level detection circuit also comprises photoelectric liquid-level switches which are arranged at liquid-level positions of the 30 percent volume, the 60 percent volume and the 90 percent volume in the water storage tank of the solar water heater; and simultaneously, the 220V AC mains-supply control circuit is used for matching to assist heating. The automatic control system has the advantages that the water temperature and the water level are maintained in the set range, so that the solar water heater is prevented from being damaged due to over-low water temperature and water scales are prevented from being formed when the water temperature is high.

Description

technical field [0001] The invention relates to the technical field of solar water heater control, in particular to a solar water heater automatic control system and a control method thereof. Background technique [0002] The energy crisis and environmental protection awareness have led to a global consensus on the use of solar energy. As a new energy and renewable energy, solar energy is favored by countries all over the world. In the past ten years, research on solar water heating, solar building, solar power generation and other technologies has continued. The development and application of solar energy technology has been developed rapidly. Solar energy has the advantages of no noise, no pollution to the environment, and renewable resources. Therefore, it is of great practical significance to fully develop and utilize solar energy. With the development of my country's economy and the improvement of people's living standards, people's demand for domestic water heaters wil...

AI Technical Summary

Problems solved by technology

[0003] At present, the solar water heaters on the market have a relatively high degree of intelligent control, such as: automatic water supply, automatic stop when the water is full, display of water temperature and water level, automatic or timing electric heating, timing water outlet, pipeline circulation and pressurization, etc. The selection of automatic control system is particularly important, especially the poor sensitivity of water temperature and water level detection and identification, which will cause automatic water addition to exceed the warning water level, and will also cause automatic heating or timing heating time too long, and excessive temperature will cause scale in the water storage tank of the water heater. Or factors such as high water temperature and insufficient automatic water supply control. More importantly, in rainy weather or winter, there is little sunlight and the heat absorbed by the solar collector is not enough, which will cause the heating temperature in the water tank to be low and fail to reach To the required water temperature, so 220V AC mains power is required to cooperate with alternate water supply and supplementary heating

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