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Solar Pressurized Cavity Thermal Receiver Numerical Simulation Research

Author: LiQing
Tutor: ZhongShuiKu
School: Guangxi University
Course: Engineering Thermophysics
Keywords: Solar The cavity thermal energy absorber Porous absorber FLUENT
CLC: TK513
Type: Master's thesis
Year: 2011
Downloads: 12
Quote: 0
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Abstract


Energy crisis for the countries in the world into the 21st century , the development of new energy , especially solar energy . Tower solar thermal power technology as the main technical way of one of the solar energy development , because of its high operating temperature of the working fluid , high thermal efficiency , with the advantages of conventional power generation technology compatibility and widely developed . In this paper, the solar thermal power tower technology solar pressure cavity heat absorber structural design and performance optimization studies . Based on computational fluid dynamics and heat transfer theory , numerical simulation using FLUENT software as a research tool . Solar pressurized the cavity thermal energy absorber can be divided into no the porous absorption of asanas and the porous absorption postures two kinds . Absorber fluid outlet temperature , inlet pressure into the inlet rate quintic polynomial relationship ; outlet flow inlet fluid rate changes in a linear relationship ; inversely proportional relationship between the heat absorption rate , the temperature difference between the inlet chamber and entrance rate . According to the theory of nonlinear optimization , the number of lumped Z comprehensive analysis of more than five the amount of optimization parameters , get Z value presented Nelder inverse relationship with the entrance rate . The maximum value of the amount Z of lumped in the inlet rate of 2.0m / s lt; Vinlet lt; 3.0m / s . On this basis , the porous absorbing body thickness and the setting position of the impact on the performance of the absorber . Through the relationship between the lumped parameter Z and the gas chamber volume ratio to optimize performance analysis . Lumped amount Z maximum appears in the case when the volume of the gas chamber when the α- LT ; 0.9 hours at the inlet rate Vmlet = 2.0m / s . When a gt; 0.9 inlet rate Vinlet = 2.5m / s case , the maximum value of the lumped parameter Z . The results of numerical simulation and actual experimental results compared with the 90 % confidence level . Porous absorbent body can improve the temperature of the pressurized cavity heat absorption distribution, reducing the failure rate and prolong life , the direction of development of the absorber .

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CLC: > Industrial Technology > Energy and Power Engineering > Special heat and its mechanical > Solar Energy Technology > Solar energy conversion devices and equipment
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