Staged heating solar water heater

Abstract

A step heating solar water heater is composed of heat collector, controller of solar water heater, pipelines, connecting and control parts, supporter, and step heating water heater. Said heat collector has step warming equipment to form 2 or more warming regions connected to respective step heating water heater via pipes. Its advantage is high overall heat efficiency.

Description

technical field [0001] The invention relates to the field of solar energy utilization, in particular to a solar water heater or system for staged heating. Background technique [0002] Since solar energy is a low-density energy source, the process of heating up through solar water heaters or system heat collection is slow, so there is heat loss in all links in the heating process, which reduces thermal efficiency. Among them, solar collectors are key components of solar water heating systems , and the heat preservation condition is worse than that of the water storage tank, and its heat collection and temperature rise process is slow. Therefore, in addition to the heat preservation of the water storage tank, the heat preservation of the water heater collector is also very important in the process of using solar energy to heat water. Due to the limitation of structure and environmental conditions, the insulation condition at the edge of the box will be worse than that in the ...

AI Technical Summary

Problems solved by technology

[0004] With this combined heat collector structure, at the beginning of heating, the primary heated heat collector can use the large temperature difference between the heating source and the water in the storage tank for rapid heating, which is a good treatment. The constant natural circulation heating method of the heater and the limitation of the layered structure of the water storage tank, when the temperature difference between the middle and the lower layers gradually narrows, a large amount of hot water that is close to the final temperature is heated for a long time, especially in the natural circulation mode. , the efficiency loss of heat dissipation and fluid resistance through the heat collector and the pipeline is also relatively large, and the hot water in the middle and lower layers of the water storage tank reaches a higher temperature and is similar to the accumulated temperature in the heat collector, which reduces the efficiency of the heat collector, and The temperature difference with the ambient temperature becomes larger, and the heat preservation efficiency decreases. Therefore, the thermal efficiency of the plate solar water heating system partly heated by natural circulation is high in the morning, and the thermal efficiency is low after noon, which is not conducive to improving the overall thermal efficiency of the solar water heating system. Two kinds of heat collectors make water heaters, which increases the production cost, and the smallest unit of the heat collector occupies a larger area, which is not suitable for use and promotion

[0005] At the same time, another problem existing in using solar water heaters or systems is: when needing to use part of the hot water, the water in the water storage tank is often not at the temperature of the hot water. In order to solve this problem, people adopt The method of graded water tanks is used to store hot water in grades, such as Chinese patent CN.2295167, the method is to use a plurality of DC circulation water storage tanks connected in series to achieve the goal of using the hottest and hottest water first. This DC circulation There are several deficiencies in the way of serial heating; the process of exposing hot water is carried out in the flat-plate collector, because the heat preservation of the flat-plate collector is usually not as good as that of the vacuum tube collector with a vacuum compartment. In the process of drying hot water, a lot of heat energy has been lost in the collector and circulation pipes

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