文中建立了带有散热翅片的复合抛物面聚光太阳能PV/T空气集热器内部传热过程的一维稳态数学模型,对传热过程进行了数值模拟,对集热器热、电、(火用)和净电效率进行了计算.分析了空气质量流量、入射光强度、风速对集热器的空气温度及系统各效率的影响.结果表明:随着入射光强度的增加,空气进出口温差、热和(火用)效率是增大的,而电效率则有所降低.随着空气流量的增加,系统的净电效率和进出口温度差是降低的.通过计算可知集热器的(火用)效率在18%～11%,热效率可达65%,净电效率低于2%,并明显受空气质量流速的影响.
In this work,a one-dimensional steady heat transfer model for a solar concentration PV/T system with fins is developed.The thermal,electrical,exergy and net electrical efficiencies are simulated.The effects of air mass flow rate.incident solar intensity and wind velocity on air temperature and the efficiencies of the air collector are analyzed. Results show that the air temperature difference,thermal and exergy efficiency increase with incident solar intensity increasing,but the electrical efficiency decreases.The air temperature rises and net electrical efficiency decreases with the air mass flow rate increasing.The calculated results indicated that the exergy efficiency is 18%～11%,the thermal efficiency is higher than 65%.The net efficiency is lower than 2%,but the air mass flow rate has obvious effects on it.
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