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The Study on Operational Performance of Solar Chimney Power Plant Sysytem with Vertical Collector

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Tutor: LiQingLing
School: Qingdao University of Science and Technology
Course: Chemical Process Equipment
Keywords: Solar energy,Solar chimney power plant,Energy conversion efficiency,Entransy dis
CLC: TM615
Type: Master's thesis
Year:  2013
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Abstract:
Against the solar chimney power plant system with vertical collection which relying on urban high-rise buildings, the group has done a large amount of related research for the running performance of the solar chimney power plant system with vertical collection which relying on urban high-rise buildings adopting the method of combining theoretical analysis and numerical simulation and experimental research at the early stage. This article on the basis of predecessors¡¯ research, aiming at the influence of the turbine and combining the unsteady natural convection of the system and aerodynamic characteristics of wind turbine and resistance characteristics of generator, establishes the mathematical expressions of the output of the power system and efficiency of the energy conversion, and the factors influencing the output of the power system and efficiency of the energy conversion are carried on the comprehensive consideration. The results show that the maximum efficiency of the energy conversion of the system is increased with the increasing of the thickness of chimney wall, and increased first and decreased later with the increasing of the height of chminey, but the width of the chimney has little influence on the maximum efficiency of the energy conversion of the system. Adopt the method of numerical simulation to analyze and research the flow field and temperature field of the system, and reaches the best location of putting turbine-at the top of the chimney.The entransy dissipation and thermal resistance of it in this system are deduced by using the theory of entransy and entransy dissipation. The influence for entransy thermal resistance of the system from the dimensions of the chimney (width, thickness and height) is discussed and analyzed. Concluded as follows, entransy thermal resistance of the system decreases gradually as the increase of system height and width. But the system width is limited by those mezzanines between building windows and the system height is restricted by building height, entransy thermal resistance of the system could not be zero. As the increase of the system thickness, the entransy thermal resistance of the system is decreased at first and then increased. When the system thickness is0.9598m, the entransy thermal resistance gets its minimum value. The whole system is optimal at that thickness.Applying the theory of field synergy to depth study on the mechanism of the system, the article can deduce the velocity distribution and temperature distribution of the turbulent boundary layer on the system and establish the synergistic relationship between the every physical quantities of the particle on the flow field system. Analyzing the parameters changes with the changes of reynolds number. The results show that the synergy angle between speed and temperature gradient, the velocity gradient and temperature gradient have some relation with the Reynolds number, with the Reynolds number increase, the synergy angle decreases, and the degree of synergy between speed and velocity gradient, pressure and pressure gradient is preferably.This paper applies the theory of entransy and entransy dissipation and the theory of field synergy to analyze the structure of the system, and gets a more reasonable system size. This method provides an important theoretical basis for research and application of the solar chimney power plant system with vertical collection.
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