纳米流体太阳能电热联产系统性能研究

提出了一种具有选择性吸收功能的直接吸收式油基纳米流体太阳能电热联产系统,采用油基二氧化钛纳米流体匹配硅光伏电池板以实现对太阳辐射的分波段利用.通过求解辐射传递方程和能量守恒方程,分析了该系统在不同聚光强度和工质循环速率条件下的工作性能.通过与传统电热联产系统中光伏模块工作温度、循环流体出口温度、光热转换效率,以及光电转换效率的比对,验证了该系统能够在维持良好的光伏电池热管理的同时获得相对高品位热能收集.结果表明,在入射光强小于200 kW/m2工况下,该系统中的光伏电池板的工作温度能够维持在330K以下,其系统总的有效输出能相较于采用导热油作为循环工质的传统电热联产系统可实现16％ ～58％的效率提升.

Performance improvement of a nanofluid solar PV/T system based on DAC concepts

To decrease the high cost, and promote the thermal energy grade, a concentrated PV/T system was designed based on the direct absorption collection（DAC） concepts. To spectral selectively absorb the solar radiation, oil based TiO2 nanofluid was applied. By solving the radiation transfer and the energy equilibrium equations, the performance im- provement of the nanofluids DAC solar collector was analysed. It is shown that with nanofluids, for incident radiation in-tensity smaller than 200 kW/m2 , the temperature of the PV cell was lower than 330 K,and the exergy efficiencies of the modified nanofluids PV/T system can be promoted to 16%- 58% of the efficiencies of the traditional PV/T system.