近年來致力於綠色能源的發展，加上台灣處於亞熱地區，日照充足，太陽能為最具潛力的一項再生能源，聚光型太陽能集熱器就是其中重要的一項，其中又以碟式／引擎效率最佳。文獻利用MCRT模擬接收器腔型的熱通量分布，因此本研究採用有限元素分析軟體ANSYS針對碟式／引擎的接收器進行穩態熱分析耦合靜態結構分析來模擬不同條件下的接收器，模擬過程中需考慮到接收器的材料－不鏽鋼與銅最高的承受溫度及降伏強度。
將每個腔型使用不同的熱通量進行模擬分析，熱通量的分布則依文獻中的分析結果給予，而接收器的聚熱係數是平均接收熱通量對太陽熱通量的比值，影響聚熱係數的因素為碟盤大小，碟盤愈大聚熱係數愈大。利用改變接收器的幾何大小，來比較其溫度分布與溫差，發現接收器尺寸較小其溫度分布較均勻。接著選定幾何尺寸較小的接收器，使用不同的聚熱係數以及設定不同的操作溫度來比較接收器整體的溫度與應力，聚熱係數與操作溫度愈大，溫差與應力亦愈大。不鏽鋼會比銅更適合作為接收器的材料，因為不鏽鋼可承受的溫度較高，能達到熱機所需要的溫度。為了能有效地將接收到的熱能傳至發電機或引擎，在接收器上方加入凹槽，比較接收器與凹槽接收器的整體差別，有凹槽的接收器溫度分布較均勻，且兩者應力差距不大。最後比較通量與溫度分布，發現通量分布影響溫度分布進而影響應力大小。

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.

[1] 台灣電力公司. Available: http://www.taipower.com.tw/
[2] 潘俊煌, "太陽能追蹤式碟型集熱史特靈發電系統," 2006.
[3] S. Jeter, "The distribution of concentrated solar radiation in paraboloidal collectors," Journal of solar energy engineering, vol. 108, pp. 219-225, 1986.
[4] V. Quaschning, "Technical and economical system comparison of photovoltaic and concentrating solar thermal power systems depending on annual global irradiation," Solar Energy, vol. 77, pp. 171-178, 2004.
[5] Y. Shuai, X.-L. Xia, and H.-P. Tan, "Radiation performance of dish solar concentrator/cavity receiver systems," Solar Energy, vol. 82, pp. 13-21, 2008.
[6] M. Prakash, S. Kedare, and J. Nayak, "Investigations on heat losses from a solar cavity receiver," Solar Energy, vol. 83, pp. 157-170, 2009.
[7] K. Reddy, S. K. Natarajan, and G. Veershetty, "Experimental performance investigation of modified cavity receiver with fuzzy focal solar dish concentrator," Renewable Energy, vol. 74, pp. 148-157, 2015.
[8] Y. Tan, L. Zhao, J. Bao, and Q. Liu, "Experimental investigation on heat loss of semi-spherical cavity receiver," Energy Conversion and Management, vol. 87, pp. 576-583, 2014.
[9] K. Lovegrove, G. Burgess, and J. Pye, "A new 500m 2 paraboloidal dish solar concentrator," Solar Energy, vol. 85, pp. 620-626, 2011.
[10] Z. Cheng, Y. He, F. Cui, R. Xu, and Y. Tao, "Numerical simulation of a parabolic trough solar collector with nonuniform solar flux conditions by coupling FVM and MCRT method," Solar Energy, vol. 86, pp. 1770-1784, 2012.
[11] Z. Wu, S. Li, G. Yuan, D. Lei, and Z. Wang, "Three-dimensional numerical study of heat transfer characteristics of parabolic trough receiver," Applied Energy, vol. 113, pp. 902-911, 2014.
[12] PIDA, "第五章 太陽能與發電應用."
[13] H. Müller-Steinhagen and F. Trieb, "Concentrating solar power," A review of the technology. Ingenia Inform QR Acad Eng, vol. 18, pp. 43-50, 2004.
[14] E. Efficiency and R. E. Clearinghouse, Concentrating Solar Power: Energy from Mirrors: Department of Energy, 2001.
[15] 楊素華 and 蔡泰成, "太陽能電池," 科學發展月刊, 台北, vol. 390, pp. 50-55, 2005.
[16] F. P. Incropera, Fundamentals of heat and mass transfer: John Wiley & Sons, 2011.
[17] 虎門科技有限公司, 結構熱傳分析, 2013.
[18] Online Materials Information Resource. Available: http://www.matweb.com/index.aspx
[19] British Stainless Steel Association (BSSA). Available: http://www.bssa.org.uk/
[20] H.-H. Lee, Finite element simulations with ANSYS workbench 14: SDC publications, 2012.