Solar water heater

Abstract

The invention provides a solar water heater which comprises a heat collector and a water tank connected with the heat collector, wherein the water tank comprises an inner container with a multilayered structure; electric heaters for auxiliary heating are arranged in the inner container and are started successively according to the water temperature for heating; the heat collector comprises mutually and oppositely-arranged arc-shaped reflecting surfaces and a heat-collecting tube arranged between the two arc-shaped reflecting surfaces; and the thermal expansion coefficients of the water tank from inside to outside gradually increase. The solar water heater has the benefits that the solar water heater can be used for auxiliary heating based on solar energy, so that the rapid thermal expansion of the inner container is avoided, and the uniform heating temperature is ensured.

Description

technical field [0001] The invention belongs to the field of solar energy, in particular to a solar water heater with auxiliary heating function. Background technique [0002] As a clean and renewable energy, solar energy has the advantages of no environmental pollution and no safety hazards, which are unparalleled by other energy sources. With the increasing tension of electricity and gas consumption across the country, solar water heaters are becoming more and more popular. Traditional solar water heaters install heat collecting tubes and water tanks on the roof of the building. The heat collecting tubes absorb the heat of the sun to increase the temperature of the water. Hot water is stored in the water tanks. When needed, hot water is introduced from outdoor hot water pipes. Indoor, for people to use. In summer, due to the long time and high intensity of sunlight, the water temperature in the water tank is too high, and the hot water cannot be used directly. It is nece...

AI Technical Summary

Problems solved by technology

In summer, due to the long time and high intensity of sunlight, the water temperature in the water tank is too high, and the hot water cannot be used directly. It is necessary to rely on the hot water pipe to connect with the tap water pipe, and the water temperature is adjusted by the mixing valve, so that the temperature of the outlet water fluctuates greatly. It often needs to be adjusted repeatedly during use, which is not only troublesome, but also greatly reduces the comfort of bathing

In winter, especially in the north, due to the short light time and low intensity, the hot water in the water tank often cannot reach the temperature required by people. At this time, the heater in the water tank works to heat the hot water to the required temperature first. Therefore, it is very inconvenient for people to use it in winter, and it is easy to catch a cold. Not only is the comfort of bathing poor, but it also causes a waste of water resources.

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