Medium-temperature solar heat collecting tube suitable for industrial application and manufacturing method for medium-temperature solar heat collecting tube

Abstract

The invention discloses a medium-temperature solar heat collecting tube suitable for industrial application, and belongs to the technical field of solar utilization. The medium-temperature solar heatcollecting tube comprises an outer tube, a central tube positioned in the outer tube, and a heat absorbing plate which is in spiral connection with the central tube, wherein the other side of the heatabsorbing plate is also in spiral connection with a peripheral tube; the central tube communicates with the peripheral tube, i.e., the central tube is connected with the bottom end of the central tube at one end of the peripheral tube; the other end of the peripheral tube is connected with the central tube at the central tube and a metal end cover; and a heat transfer medium is arranged in the central tube and the peripheral tube. The medium-temperature solar heat collecting tube has the advantages of being high in heat-up speed and good in heat transfer performance.

Description

technical field [0001] The invention belongs to the technical field of heat pipes, and in particular relates to a medium-temperature solar heat collection pipe suitable for industrial application and a manufacturing method. Background technique [0002] As a highly efficient heat transfer element, heat pipe has developed rapidly since its inception. This new technology has aroused great interest of scholars and technology developers from various countries, and it has been applied in many fields. In the field of solar energy utilization, heat pipes are mainly used as heat transfer elements. It is not only used for solar collectors to provide domestic hot water, but also as a heat transfer element for power equipment such as solar heating and solar power generation. [0003] Solar vacuum heat collectors include all-glass vacuum heat collectors and glass’metal-sealed vacuum heat collectors. The heat pipe vacuum heat collecting tube is a kind of vacuum heat collecting tube se...

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Problems solved by technology

[0005] In use, it is found that the heat pipe utilizing solar vacuum concentration has the following problems: First, the heat transfer medium is located in a straight central tube. Although the cooling-vaporization cycle is fast, the heating time of the heat transfer medium is short during the cycle; The second is that the concentrating reflector connected to the central tube is a straight plate with a small heating area, which cannot make full use of the vacuum volume in the all-glass vacuum heat collecting tube.

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