| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系 === 103 === This study investigates the temperature and stress distribution of a solar receiver by finite element software ANSYS with coupling of the steady-state thermal and the static structural analysis. Two materials as the stainless steel and copper were selected as the materials of receiver for analysis.
Different designs of cavity receiver were selected and heated by different heat flux distributions in the simulation analysis. The distribution of heat flux for each receiver design was based on the data from the literature. A concentration coefficient (C) is defined to be the ratio of the average heat flux to solar radiation flux. The value of concentration coefficient is determined by the concentration dish. By changing geometric size of the receiver, the temperature and thermal stress distribution were simulated and discussed. The receiver with a smaller height is considered more appropriate as a solar concentrating receiver in considering a uniform temperature distribution. Then, with the selected receiver geometry, different concentration coefficients (C) were used to define the receiver heat flux for analysis. Two operating temperatures were defined at the surface for thermal output and the resulting temperature and thermal stress were compared. In some case, the thermal energy has to be transferred to the steam turbines or engines by some other heat transfer devices; a cavity on the thermal output surface is desired and compared to the overall receiver. Cavity receiver is a better selection, because it has smaller temperature difference than others. It is also found that the resulting temperature distribution in the receiver is similar to the heat flux distribution. The maximum service temperature for copper is below 700℃. It was concluded that stainless steel is more suitable than copper to be the receiver material.
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