Blended Ag nanofluids with optimized optical properties to regulate the performance of PV/T systems

纳米流体 材料科学 透射率 光电子学 光伏系统 太阳能电池 解耦(概率) 纳米技术 纳米颗粒 生态学 控制工程 生物 工程类
作者
Chunxiao Zhang,Chao Shen,Qianru Yang,Shen Wei,C. T. Sun
出处
期刊:Solar Energy [Elsevier BV]
卷期号:208: 623-636 被引量:35
标识
DOI:10.1016/j.solener.2020.08.037
摘要

Traditional PV/T systems, with passive cooling channels, can not solve the problem of coupling power/heat source on the surface of PV modules, resulting in lower electrical efficiency of solar cells. The active spectrum regulation technology using nanofluids, is a promising method to absorb spectrum energy not responding to solar cells, and reduce cell temperature and improve electricity efficiency. Though many nanofluids have been selected as optical nanofluids to separate/decoupling electricity and heat from composite spectral energy, no feasible method was proposed to select proper nanofluids to match the ideal window of solar cells. Therefore, from the view of spectrum regulation, some blended Ag nanofluids were present to numerically investigate the performance of PV/T systems, using a 2D-Monte Carlo method. Results indicated that nanoparticle radius, ranging from 20 nm to 60 nm, drove the movement of peak absorption from 395 nm to 520 nm, following a linear profile. Meanwhile, increased volume concentration and optical thickness reduced spectral transmittance, leading to lower cell temperature but worse output performance. Additionally, blended Ag nanofluids, with particle radius of 20 nm or 20/40 nm (8:2), volume concentration of 2.5 ppm and optical path of 10 mm, were optimal solutions for both Si cell and GaAs cell. The electrical efficiency and merit function value of Si cells were 11.85% and 1.61 for 20 nm nanofluid, 11.0% and 1.66 for 20/40 nm (8:2) nanofluid, while that of GaAs cell were 9.30% and 1.92 for 20 nm nanofluid, 9.03% and 2.05 for 20/40 nm (8:2) nanofluid, respectively.
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