Collectors for solar water heaters

Abstract

The invention discloses a collector of a solar water heater. The collector of the solar water heater comprises a transparent vacuum outer tube and a heat collection inner tube, the heat collection inner tube is inserted into the vacuum outer tube, and the two ends of the heat collection inner tube are connected with the outer wall of the vacuum outer tube in a sealing mode; the heat collection inner tube comprises a heat conduction outer tube, a heat storage layer and a heat conduction inner tube, the heat storage layer (2) is arranged between the heat conduction outer tube and the heat conduction inner tube, and the two ends of the hear storage layer are connected with the heat conduction outer tube and the heat conduction inner tube in a sealing mode; the materials of the heat storage layer are phase-change materials, and the phase-change materials are mixtures of carbon powder, coupling agents, polyethylene wax, and paraffin. The collector of the solar water heater has the advantages that the structure is simple, on one hand, collected solar energy is converted into heat energy, and the heat energy are fully stored in the heat storage layer (2); on the other hand, the preparation is simple, the cost is low, the poisonless and harmless properties are achieved, and the popularization and the application are facilitated.

Description

technical field [0001] The invention relates to a solar water heater, in particular to a heat collecting tube of the solar water heater. Background technique [0002] Solar energy is both primary energy and renewable energy. It is rich in resources and can be used free of charge without transportation and without any pollution to the environment. In the thermal utilization of solar energy, the key is to convert the radiant energy of the sun into thermal energy. Since the solar energy is relatively scattered, we must try to concentrate it. [0003] Solar water heater is an important device for concentrating the radiant energy of the sun, which can concentrate the scattered solar energy and convert it into heat energy. [0004] A common solar water heater includes a heat collector. The heat collector includes an outer tube and an inner heat collecting tube. The inner heat collecting tube is arranged in the outer tube, and there is a vacuum between the two. [0005] Therefo...

AI Technical Summary

Problems solved by technology

Although the black chromium coating material is also a good heat absorbing material, its absorption rate is about 91%, the reflectivity is as high as 5%, and the absorption-emission ratio (α / ε) is close to 6-13, but this kind of material is usually used Prepared by electroless plating method, complex configuration of electroplating solution, high production cost and pollution to the environment

[0009] Chinese patent CN 103525377A discloses a coating, although it can overcome the defects of the previous patents, it is still a coating and cannot fundamentally solve the problem

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