Vacuum tube solar heat collector

Abstract

A vacuum tube solar heat collector is provided with a vacuum tube and a heat exchange tube, a circulating water pump is installed on a pipeline of the heat exchange tube, a heat collecting tube is installed on the inner side of the vacuum tube and is provided with an outer copper tube and an inner copper tube, the lower end of the outer copper tube is the blind end, the upper end of the outer copper tube is communicated with one end of the heat exchange tube, a rubber sleeve used for sealing is arranged between the outer copper tube and the vacuum tube, the inner copper tube is arranged in the outer copper tube, a gap is formed between the lower end of the inner copper tube and the blind end of the outer copper tube, the upper end of the inner copper tube penetrates through the wall of the outer copper tube and is communicated with the other end of the heat exchange tube, and superconduction liquid is contained in the inner copper tube, the outer copper tube and the heat exchange tube. The vacuum tube solar heat collector has the advantages that the heat exchange efficiency is high, the size is small, the installing area is saved, and the weight and the manufacturing cost of the heat collector are reduced.

Description

technical field [0001] The invention relates to a solar heat collector, in particular to a vacuum tube solar heat collector. Background technique [0002] The existing solar collectors have the characteristics of freezing resistance, fast start-up, no fouling, good heat preservation, high pressure bearing, good thermal shock resistance, easy installation and reliable operation, and have been well received by users. The technology is relatively mature, and it is sought after by people as a source of clean and cheap heat energy. However, in large and medium-sized cities, the promotion of solar collectors has encountered a bottleneck. The reason is that when used in cities, solar collectors The array occupies a large space, and in order to obtain sufficient solar radiation, it needs to be placed on the roof of the building, so under the constraints of the limited area of ​​the roof, only some residents can enjoy the heat source provided by the solar collector. The heat collect...

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Problems solved by technology

[0002] The existing solar collectors have the characteristics of freezing resistance, fast start-up, no fouling, good heat preservation, high pressure bearing, good thermal shock resistance, easy installation and reliable operation, and have been well received by users. The technology is relatively mature, and it is sought after by people as a source of clean and cheap heat energy. However, in large and medium-sized cities, the promotion of solar collectors has encountered a bottleneck. The reason is that when used in cities, solar collectors The array occupies a large space, and in order to obtain sufficient solar radiation, it needs to be placed on the roof of the building, so under the constraints of the limited area of ​​the roof, only some residents can enjoy the heat source provided by the solar collector. The heat collection in the vacuum tube of the solar collector belongs to the environmental heat collection. The temperature in the vacuum tube can reach more than 200 degrees, while the temperature of normal water does not exceed 100 degrees. The remaining temperature cannot be exchanged and output in time, which will cause waste. Therefore, Improving the heat exchange efficiency of solar collectors, thereby reducing the volume of solar collectors has become the key to the popularization and application of solar collectors in cities. The most effective way is to increase the surface area of ​​heat collecting tubes in solar collectors. In the technology, the heat exchange tube is made into a spiral shape. Although the heating surface area of ​​the heat collecting tube in the vacuum tube is increased, the resistance of the heat medium in the heat collecting tube is increased, and the effect is not good. Therefore, the existing commercially available solar energy Most heat collectors also use U-shaped tubes as heat-collecting tubes, but the U-shaped tubes are limited by the diameter of the inner cavity of the vacuum tube and its U-shaped bend, which cannot further improve the heat exchange efficiency of the solar collector, and cannot further reduce the cost of the solar collector. volume

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