Four-target solar energy heat collection pipe

Abstract

The invention discloses a four-target solar energy heat collection pipe, and belongs to the technical field of solar energy application. The four-target solar energy heat collection pipe includes an inner pipe and an outer pipe, the outer pipe is coaxially arranged on the periphery of the inner pipe in a sleeving mode, a vacuum zone is formed between the inner pipe and the outer pipe, the outer wall of the inner pipe is provided with a coating, the longitudinal section of the coating is a line which is provided with a peak section, a valley section and a diagonal section, and the inner wall ofthe outer pipe is provided with a metal layer and a second reflecting layer. According to the four-target solar energy heat collection pipe, the coating with the peak section and the valley section is arranged on the surface of the inner pipe, the inner wall of the outer pipe is provided with the metal layer and the second reflecting layer, the heat absorption efficiency of the solar energy heatcollection pipe can be effectively improved, and the four-target solar energy heat collection pipe is not prone to being aged and being fell off.

Description

technical field [0001] The invention relates to the technical field of solar energy applications, in particular to a four-target solar heat collecting tube. Background technique [0002] In the thermal utilization of solar energy, the conversion of the sun's radiant energy into thermal energy is widely used. The solar collector is a device that converts the sun's radiant energy into thermal energy. It is a key component of various solar thermal utilization systems. The solar collector tube is a vacuum tube heat collector. It vacuumizes the space between the heat absorber and the transparent cover. The solar collector tube can well solve the problem of convective heat exchange and heat dissipation between the heated medium and the outside world. , so it is widely used in solar thermal utilization systems. [0003] A general vacuum tube is composed of an inner tube and an outer tube, the outer tube is transparent, and the outer surface of the inner tube is coated with a selec...

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Problems solved by technology

[0003] A general vacuum tube is composed of an inner tube and an outer tube, the outer tube is transparent, and the outer surface of the inner tube is coated with a selective coating using a special process. Due to the limitation of target material characteristics, the refractive index and reflectivity of the inner tube coating are low, and the absorption rate and service stability of the heat collector still need to be improved

In addition, when the solar heat collection tube is in use, the temperature of the inner tube rises after collecting heat, which will inevitably radiate heat to the surrounding low-temperature objects, resulting in heat radiation loss, and the heat loss of the vacuum tube is mainly caused by heat radiation, so reducing radiation heat loss is important for improving the efficiency of the vacuum tube. The operating efficiency of the

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