通过实验测试和数值模拟对太阳辐射能量转换器(solar energy converter)及其填充的泡沫陶瓷辐射吸收特性、气流流动和换热特性进行研究。研究结果表明:应用Lacoix模型建立太阳辐射能量转换器内填充SiC泡沫陶瓷气流流动模型是合理的。在...通过实验测试和数值模拟对太阳辐射能量转换器(solar energy converter)及其填充的泡沫陶瓷辐射吸收特性、气流流动和换热特性进行研究。研究结果表明:应用Lacoix模型建立太阳辐射能量转换器内填充SiC泡沫陶瓷气流流动模型是合理的。在实验条件下,太阳辐射能量转换器出口处流通空气温度可达600.82K,太阳辐射辐射能转换为流通空气热能的效率可达51%;在相同条件下,随着太阳能反射镜的有效辐射面积和辐射强度的增加,太阳辐射能量转换器出口处流通空气温度几乎呈线性增长;随着泡沫陶瓷孔隙率增大,太阳辐射能量转换器出口处流通空气温度先增大后减小。展开更多
Thermodynamics analysis was carried out for solar thermal receivers with different selective coatings.The relation between the energy conversion efficiency of a medium-high temperature solar thermal system,the spectra...Thermodynamics analysis was carried out for solar thermal receivers with different selective coatings.The relation between the energy conversion efficiency of a medium-high temperature solar thermal system,the spectral properties of selective coating and the operating temperature of the receiver were discussed.Furthermore,the relation between the optimum operating temperatures,the exergy efficiencies and the incident solar flux were analyzed for the traditional concentrating system and concentrating beam splitting system,respectively.According to the analysis results for the thermal receiver with blackbody surface and selective coatings,the optimum cutoff wavelength was obtained for the ideal selective coating.An analysis method for the optimum operating temperature calculation was developed for thermal receivers with selective coating.The optimum operating temperature for an actual selective coating was analyzed on the basis of the proposed theory.展开更多
文摘通过实验测试和数值模拟对太阳辐射能量转换器(solar energy converter)及其填充的泡沫陶瓷辐射吸收特性、气流流动和换热特性进行研究。研究结果表明:应用Lacoix模型建立太阳辐射能量转换器内填充SiC泡沫陶瓷气流流动模型是合理的。在实验条件下,太阳辐射能量转换器出口处流通空气温度可达600.82K,太阳辐射辐射能转换为流通空气热能的效率可达51%;在相同条件下,随着太阳能反射镜的有效辐射面积和辐射强度的增加,太阳辐射能量转换器出口处流通空气温度几乎呈线性增长;随着泡沫陶瓷孔隙率增大,太阳辐射能量转换器出口处流通空气温度先增大后减小。
基金supported by the National Basic Research Program of China("973" Project)(Grant No.2010CB227305)
文摘Thermodynamics analysis was carried out for solar thermal receivers with different selective coatings.The relation between the energy conversion efficiency of a medium-high temperature solar thermal system,the spectral properties of selective coating and the operating temperature of the receiver were discussed.Furthermore,the relation between the optimum operating temperatures,the exergy efficiencies and the incident solar flux were analyzed for the traditional concentrating system and concentrating beam splitting system,respectively.According to the analysis results for the thermal receiver with blackbody surface and selective coatings,the optimum cutoff wavelength was obtained for the ideal selective coating.An analysis method for the optimum operating temperature calculation was developed for thermal receivers with selective coating.The optimum operating temperature for an actual selective coating was analyzed on the basis of the proposed theory.
