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A Theoretical Study of a Gravity- Assisted Loop Heat Pipe Solar Collector

Author: WenYuLiang
Tutor: PuShaoXuanï¼›TangRunSheng
School: Yunnan Normal University
Course: Agricultural Biological Environmental and Energy Engineering
Keywords: Gravity heat pipe Separate type heat pipe Loop Heat Pipe Solar collector
CLC: TK513
Type: Master's thesis
Year: 2005
Downloads: 361
Quote: 5
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Abstract


This paper the development trend of China's solar thermal and solar thermal utilization of the Solar Energy Research Institute of Yunnan Normal direction of research and development , the loop heat pipe principle applied to flat plate collectors , the purpose of the research and development of new collectors . This paper attempts to Kunming typical climate conditions , the simulation loop gravity heat pipe collector operating characteristics and structural parameters on system performance . The core of the solar thermal conversion technology is a high - quality , high conversion rate of solar collectors . The future of solar thermal utilization trends is the combination of solar energy and building solar flat plate collector is the best way in conjunction with the construction of solar collectors . Yunnan Province has the nation's largest flat-plate solar water heater market , collectors of the current run is mostly flat plate collectors , but the lack of technical conditions of its antifreeze capability limits to the development of the province . The heat pipe is a working fluid phase change heat transfer efficiency heat transfer components in the aerospace industry is widely used in the solar collector applications is very broad . The shape of the heat pipe heat pipe with the heat source and heat sink conditions change according to the environment need to be made flexible structure of the form and type of body size . Liquid working fluid does not fill the entire tube expansion space in the case of frozen , produced by the solar collectors , its freezing capacity , especially compared with antifreeze poor ordinary flat solar collector . Due to the the unidirectional gravity heat pipe heat transfer characteristics , heat pipe solar collector to prevent backflow played a very good effect at night . This paper, and the initial establishment of the physical and mathematical model of the heat pipe collector loop gravity , use mathematical software simulation , analysis of its operating characteristics , provide a theoretical basis for the design and development of future new collectors . The simulation results show that : If you do not take into account the thermal resistance of the condenser section placed in the tank , the simulated solar water heater more efficient than ordinary flat-plate collector . The collector evaporator section of the heat pipe thermal resistance is small , the size of the thermal resistance depends mainly on the plate and pipe fin efficiency . Results to the manufacturing of the heat pipe collector specified direction , carefully manufactured high efficiency heat exchanger of the condenser section is to improve one of the main part of such heat pipe collector .

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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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