Trough-type vacuum tube heat collecting device of condenser heat tube

Abstract

The invention discloses a trough-type vacuum tube heat collecting device of a condenser heat tube, and the main body of the device comprises a glass vacuum tube (5), a copper heat tube (2) with a curved surface fin (3). The copper heat tube (2) and the curved surface fin (3) are welded into a whole; one side of the fin is fitted on the wall face inside a full-glass vacuum tube more tightly. The existence of the fin increases the area to receive solar radiation, and simultaneously strengthens heat absorbing capability of the heat tube from the vacuum tube. The condensation end of the heat tubeexposes out of the vacuum tube, extends into working fluid of heat absorption and releases heat to the working fluid. A selective coating with high absorptivity and low emissivity is coated on the heat absorbing surface of inner glass of the full-glass vacuum tube; the two tube ends are closed; and one end of the tube is embedded into a conjugant (1) prepared by heat insulating materials and is fixed. The heat tube is also arranged in the vacuum tube after passing through the conjugant. The sealing part of the heat tube and the vacuum tube does not need to directly contact; the connection difficulty caused by the difference of coefficient of thermal expansion of metal and glass is avoided; the manufacturing process is relatively simple; and the cost is lowered.

Description

technical field [0001] The invention relates to a solar heat collecting device using a heat pipe vacuum tube on a trough concentrator, belonging to the field of solar energy utilization and solar energy concentration. Background technique [0002] Solar energy is currently one of the most concerned sources of energy in the field of new energy. Both in terms of heat utilization and power generation, great progress has been made in recent years. Solar power generation includes two types of thermal power generation and photovoltaic power generation. The solar thermal power generation technology uses solar energy to heat the heat-absorbing working medium, and then drives the generator to generate electricity, and the generated electric energy is incorporated into the grid for use. Due to the high temperature of the working fluid required to drive the generator, a concentrating solar collector is generally used to collect solar radiation, so that the heat-absorbing working fluid ...

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Problems solved by technology

In addition, the selective absorbing coating is not applied on the heat pipe, but on the heat absorbing tube body of the vacuum tube. The high heat transfer pe

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