Numerical Simulation Study On The Heat Recessive Of Disc Type Solar Thermal Power Generation System

The solar heat receiver of which improves the efficiency, reliability and reduces thecost is one of the focuses in the study of solar heat receiver which is one of the corecomponents of disc type solar thermal power generation system. But studies show thatthe heat loss and thermal non-uniformity of heat receiver limits its efficiency, reliabilityincreased. So what study how to reduce the heat losses and thermal non-uniformity ofheat receiver is vital significance. This paper numerical study a new type heat receiverwhich is used to dish stirling solar thermal power generation system.The main study of this paper is as follows:Using the Fluent software, a numerical comparison that adopt computational fluiddynamics theory to establish the calculation model is performed in this paper to analyzethe modified cavity receiver with five bending which apply to dish stirling solar thermalpower generation system. Through the model validation it is observed that the presentnumerical procedure is in reasonable under the constant temperature of wall, adoptingS2S radiation and applying transient calculation method to air’s density. In cavityaperture facing down, the convection and radiation heat losses, the radiation and the totalNusselt numbers from the receiver with the increase of bending increase monotonicallywhile the convection Nusselt numbers from the receiver decrease monotonically and theradiation heat loss is most of the total heat loss. Comprehensive results show that anoptimum bending range of the modified cavity receiver is0.4～0.5.In order to reduce the convection and radiation heat losses of modified cavityreceiver we install a quartz window in cavity aperture, which choose the modified cavityreceiver with0.5bending. Using the Fluent software, a numerical comparison that adoptcomputational fluid dynamics theory to establish the calculation model is performed inthis paper to compare the modified cavity receiver with a quartz window with themodified cavity receiver without a quartz window, which apply to dish stirling solarthermal power generation system. Through the model validation it is observed that thepresent numerical procedure is in reasonable under the constant temperature of wall,adopting DO radiation and applying transient calculation method to air’s density. Weobtained that the convection and radiation heat losses of modified cavity receiver with a quartz window are significantly less than the modified cavity receiver with normalwindow and the change of the convection and radiation Nusselt numbers is the same.Through this study, it provides the necessary knowledge and theory reference forimproving the performance of the receiver as well as dish stirling solar thermal powergeneration system.