STUDY OF RADIATION HEATING AND HEAT TRANSFER OF A CONCENTRATING SOLAR POWER SYSTEM WITH CAVITY RECEIVER

摘要

Solar absorber is a device to collect the solar radiation and convert it intornheat energy for the subsequent applications. This study studied the radiationrnheat flux absorbed in a cavity solar receiver by the ray tracing method for arndish concentrating solar power system. The resulting heat flux on thernabsorber was used to calculate the temperature distributions of the receiver.rnCavity receivers with cylindrical or square shapes of cavities were comparedrnby numerical simulations. By varying the cavity depth and focal position ofrnthe receiver, the radiation heat flux and temperature distributions wererndiscussed. A circulating fluid channel was used as the heat output device ofrnthe receiver. According to the temperature limit of the receiver material,rndesign of the setup of the CSP system was proposed with the specified outputrntemperature for the fluid channel. Under the material’s temperature limit, thernoutput temperature of the fluid will be restrained within a certain maximum.rnThis output temperature maximum was found to decrease with the increasernof concentration factor.