A solar water heater with axial variation of inner fin height

Abstract

The invention provides a solar water heater. The solar water heater comprises a heat collector; the heat collector comprises a heat collecting tube; the heat collecting tube comprises a flat tube and fins; the flat tube comprises parallel tube walls and sidewalls; the sidewalls are connected with the end parts of the parallel tube walls; a fluid passage is formed between the sidewalls and the parallel tube walls; inner fins are arranged on the inner wall of a heat absorbing end of the heat collecting tube; the inner ribs are shaped like straight plates; the extension direction of each inner fin is along the direction from the heat absorbing end to a heat releasing end. According to the solar water heater disclosed by the invention, each fluid space formed by the inner fins stays the same with the flowing direction of a fluid, so the flow resistance is reduced, heat absorption is also improved and intensified, the heat absorption efficiency of the solar water heater is improved, and energy is saved.

Description

technical field [0001] The invention belongs to the field of solar energy, in particular to a solar water heater. Background technique [0002] With the rapid development of modern society and economy, the human demand for energy is increasing. However, the reserves of traditional energy such as coal, oil, and natural gas continue to decrease and become increasingly scarce, resulting in rising prices. At the same time, the environmental pollution caused by conventional fossil fuels is also becoming more and more serious. These greatly limit the development of society and the improvement of human life quality. . Energy issues have become one of the most prominent issues in the contemporary world. Therefore, seeking new energy sources, especially non-polluting clean energy sources has become a research hotspot. [0003] Solar energy is an inexhaustible clean energy with a huge amount of resources. The total amount of solar radiation energy received by the earth's surface ev...

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Problems solved by technology

[0004] In general, solar water heaters use heat collecting tubes to absorb heat, but the heat collecting tubes may lose heat due to heat transfer problems, and because the fins are installed inside the heat collecting tubes, the fluid resistance increases, resulting in low heat transfer coefficients.

[0005] In addition, during the heat-absorbing process at the heat-absorbing end of the heat-collecting tube, the heat transfer at each position of the heat-absorbing end is different, resulting in uneven local heat transfer

[0006] In view of the above problems, the present invention provides a new solar water heater, thereby solving the problems of low heat transfer coefficient and uneven heat transfer when the heat collecting tube absorbs heat

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