Reticulated porous volumetric solar receiver designs guided by normal absorptance and hemispherical volumetric emittance investigations
Reticulated porous volumetric solar receiver designs guided by normal absorptance and hemispherical volumetric emittance investigations
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DOI：
10.1016/j.ijheatmasstransfer.2017.07.004
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发表时间：
2017-11
影响因子：
5.2
通讯作者：
Dong Liu;Qiang Li;Y. Xuan
中科院分区：
文献类型：
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作者：
Dong Liu;Qiang Li;Y. Xuan
本文从法向吸收率和半球体积发射率的角度对体积接收器进行了设计。我们发现，迄今为止，具有网状多孔结构的最佳接收器应具有95%的孔隙率，平均孔径为0.4 mm，长度为8 mm。该接收器具有高的法向吸收率和低的半球体积发射率，因为这些几何参数被设计成实现足以实现最大可能法向吸收率的最小光学厚度。此外，其高孔隙率和小孔径可实现使用复制技术有助于高比表面积和由此产生的高体积对流传热系数。我们的研究结果表明，热效率可以潜在地进一步提高通过整合纹理可比的波长内的毫米级孔，以调整辐射以及对流性能。
Here, we designed volumetric receivers from the angle of their normal absorptance and hemispherical volumetric emittance. We showed that the optimal receiver with the reticulated porous structure to date should have 95% porosity, 0.4 mm average pore diameter and 8 mm length. This receiver has both high normal absorptance and low hemispherical volumetric emittance because these geometric parameters are designed to achieve the minimum optical thickness that is sufficient to achieve the largest possible normal absorptance. In addition, its high porosity and small pore size achievable using replication technique contribute to high specific surface area and resultant high volumetric convective heat transfer coefficient. Our results demonstrated that the thermal efficiency can be potentially further enhanced by integrating textures comparable to the wavelength within the millimeter-scale pores to tune radiation as well as convection properties.