摘要
对内径为6 mm,壁厚为2 mm的太阳能热发电用金属管式承压空气吸热器的热性能进行了实验研究,分析了太阳法向直接辐照度(DNI),金属管式承压空气吸热器内空气质量流量对该吸热器出口空气温度的影响。实验结果表明:在空气质量流量相同的条件下,DNI越高,金属管式承压空气吸热器出口空气温度越高,该吸热器获得的热功率越大,吸热器内空气粘性越高,吸热器内空气压力损失也越大;随着金属管式承压空气吸热器内空气质量流量逐渐减小,该吸热器出口空气温度逐渐升高;随着金属管式承压空气吸热器内空气质量流量逐渐增大,该吸热器内空气压力损失逐渐增大;金属管式承压空气吸热器热效率受DNI和空气质量流量的综合作用,且该吸热器热效率的最大值出现在DNI较低处;当金属管式承压空气吸热器内空气压力损失较大时,应增大吸热管的管径或缩小吸热管单管的管长。
The paper focused on the experimental research on thermal performance of the metal tubular pressurized air receiver for concentrating solar power generation (CSP), with inner diameter of 6 mm and thickness of 2 mm. The result shows that on the same conditon of mass flow rate, Direct Normal Irradiance (DNI) and mass flow rate have direct effect on exit air temperature. The higher the DNI, the higher exit air temperature, which leads to higher power output, higher air viscosity and higher pressure drop. With the decrease of mass flow rate, outlet air temperature becomes higher; the greater the mass flow, the higher pressure drop. Thermal efficiency is affected by the combinition effect of DNI and mass flow, and the maximum value of thermal efficiency appears at the lower time of DNI. The higher pressure drop of air receiver suggests that the pipe diameter should be increased or the pipe length should be reduced.
出处
《可再生能源》
CAS
北大核心
2016年第9期1280-1286,共7页
Renewable Energy Resources
基金
中国能源建设集团有限公司科技项目(CEEC2014-KJ14)