Isothermal-structure solar heat absorber

Abstract

The invention discloses a treetop-shaped isothermal-structure solar heat absorber. The heat absorber comprises a plurality of coils which are stacked up and down. The coils are circular. The coils aretightly attached layer by layer, and the radiuses of the coils are gradually decreased from bottom to top so as to form a semi-oval-shaped heat absorbing portion. A branch pipe communicating with thecoils is arranged at one ends of the coils. A header communicating with the coils is arranged at the other ends of the coils. A working medium outlet is formed in the lower end of the header. A working medium inlet is formed in the lower end of the branch pipe. According to the isothermal-structure solar heat absorber, the heterogeneity of density distribution of concentrated solar energy flow and the working medium endothermic temperature rising characteristic are comprehensively considered, the bionic principle that trees efficiently utilize sunlight is used for reference, the treetop-shaped isothermal-structure solar heat absorber is provided, the fact that the endothermic working medium flow rates in the coils are gradually increased from bottom to top of the heat absorber is matchedwith the characteristic value that the concentrated solar energy flow density is gradually decreased from top to bottom in the generatrix direction of the heat absorber, it is guaranteed that the heatabsorber coils are uniform in temperature, and the heat efficiency is high; and each coil is relatively independent, the coil high-temperature heat stress is small, operational reliability is high, and the service life is long.

Description

technical field [0001] The invention relates to the field, in particular to a solar heat absorber with an isothermal structure. Background technique [0002] High-temperature heat conversion of solar energy is an important way of efficient utilization of solar energy. High-temperature heat absorbers convert concentrated sunlight into high-temperature heat sources, which is one of the core devices and key technologies for high-temperature heat conversion of solar energy. [0003] There are two main working modes of existing solar heat absorbers: surface heat absorber and volumetric heat absorber. The volumetric heat absorber has high thermal efficiency, but its structure is complex, some key materials and heat transfer technologies have not been overcome, and its reliability is poor. This type of heat absorber is still in the research stage. The surface heat absorber has simple structure and good reliability, and has already been applied in engineering. [0004] However, du...

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Problems solved by technology

[0004] However, due to the strong inhomogeneity of the energy flux density distribution of the concentrated solar spot, the thermal efficiency of the surface heat absorber currently put into engineering application is relatively low, and the local temperature is too high, which affects the service life and reliability.

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