A solar concentrating heat collector and design method thereof

Abstract

The invention discloses a solar light condensed heat collector and a method for designing the solar light condensed heat collector. A paraboloid main reflector is arranged. A vacuum heat collecting pipe is installed on the symmetrical axis of the cross section of the paraboloid main reflector and on the inner side of the focal line of the paraboloid main reflector. An even light reflector is installed on the outer side of the focal line of the paraboloid main reflector. The even light reflector and an opening of the paraboloid main reflector are oppositely arranged and fixedly connected. According to the solar light condensed heat collector and the method for designing the solar light condensed heat collector, the vacuum heat collecting pipe is arranged below the position of the focal line of the paraboloid main reflector, the even light reflector is additionally arranged and opposite to the opening of the paraboloid main reflector, solar radiation energy can be distributed at the bottom and the top of a heat absorption pipe, solar energy flux density distribution on the wall face of the heat absorption pipe is homogenized, the temperature gradient and the highest temperature of the wall face of the heat absorption pipe are reduced, a series of problems caused by uneven energy flux density can be avoided from the source, and safety performance of the vacuum heat collecting pipe is improved.

Description

technical field [0001] The invention belongs to the technical field of solar thermal utilization, and in particular relates to a trough-type solar concentrating collector with uniform light reflecting mirrors capable of obtaining relatively uniform solar flux density distribution on the surface of heat-absorbing pipes and improving safety performance and its design method. Background technique [0002] Trough solar thermal power generation technology is currently the most mature solar thermal power generation technology, mainly using heat transfer oil and water / steam as heat transfer fluid. No matter what kind of heat transfer fluid is used, because the traditional concentrating system focuses the solar radiation energy to the bottom of the heat absorbing tube, the distribution of solar flux density on the surface of the heat absorbing tube is extremely uneven. Due to the limited thermal conductivity of the heat-absorbing pipe wall and the convective heat transfer coefficie...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned problems in the prior art, and to provide a method that can avoid the large temperature gradient on the wall surface of the heat-absorbing pipe caused by the uneven distribution of the solar flux density on the surface of the heat-absorbing pipe, the local temperature of the heat-absorbing pipe wall is too high, and the A solar concentrator with a homogeneous reflector and its design method for problems such as heat pipe bending and deformation. The concentrator can obtain a relatively uniform solar flux density distribution on the surface of the heat-absorbing pipe

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