Microscale phase change heat collector for solar disc type heat generation system

Abstract

The invention discloses a microscale phase change heat collector for a solar disc type heat generation system. The microscale phase change heat collector is used for the solar disc type heat generation system and is used as a solar heat collector of a Stirling engine to play an important role of quickly transmitting high temperature heat. The inner surface of the heat collector is of a microgroove structure; and a work medium inside the heat collector is a sodium liquid which is sodium vapor. When the heat collector works, liquid state sodium packaged in an evacuated cavity of the heat collector absorbs the focused high temperature solar energy and is quickly evaporated into the sodium vapor on the surface of a microgroove group, wherein a large deal of latent heat is absorbed in the process. The sodium vapor is condensed on the outer wall of the heat collector of the Stirling engine positioned at the cold end of the heat collector, quickly releases the latent heat, is changed into a liquid state, and flows back to a sodium liquid pond under the action of gravity along the inner wall of a heat collecting casing to finish the primary phase change heat transfer process. According to the reciprocated circulation, the focused solar energy can be continuously transmitted to the heat absorber of the Stirling engine.

Description

technical field [0001] The invention is a heat collector with a microscale phase change structure used for a Stirling engine (hereinafter referred to as a Stirling engine) in a solar dish thermal power generation system. Utilize the application field of heat transfer technology with micro-scale phase change. Background technique [0002] Solar dish thermal power generation technology uses a dish parabolic concentrator to collect solar energy, and then uses a Stirling machine located near its focal point as the core power machine. The latter can directly use the focused solar energy to output mechanical work, thereby driving its output shaft The associated generator generates electricity. The solar heat collector is located between the concentrator and the Stirling machine, and its function is to collect and transmit the focused solar energy to the heat absorber of the Stirling machine. This technology belongs to the field of high-temperature thermal utilization of solar en...

AI Technical Summary

Problems solved by technology

The former has a simple structure and is easy to process, but due to the inhomogeneity of light heating, the life of the heat sink is short; the latter can heat evenly and prolong the life of the heat sink, but it is more difficult to process and package

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