Multi-scale investigation on the absorbed irradiance distribution of the nanostructured front surface of the concentrated PV-TE device by a MC-FDTD coupled method

Zhou, Yi-Peng; He, Ya‐Ling; Qiu, Yu; Ren, Qinlong; Xie, Tao

doi:10.1016/j.apenergy.2017.05.115

Cited by 31 publications

(16 citation statements)

References 34 publications

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“…The MCRT is a method for calculating the paths of rays through an optical system, where possible optical events including absorption, scattering, refraction, and reflection are modeled in a random way. The MCRT has been successfully employed in the performance simulations of parabolic trough collector [40][41][42][43][44][45], linear Fresnel collector [46][47][48][49], parabolic dish collector [50][51][52], and solar power tower [53][54][55][56]. For simplifying the description, detailed descriptions of the model and code that has been published in Ref.…”

Section: Heat Fluxes On Tube Wall and Liquid Saltsmentioning

confidence: 99%

Numerical and experimental study on heat transfer and flow features of representative molten salts for energy applications in turbulent tube flow

Qiu

Sun

et al. 2019

International Journal of Heat and Mass Transfer

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This article investigated the heat transfer performance and flow friction of the molten salts in turbulent tube flow, where four salts including Hitec, Solar Salt, NaF-NaBF4, and FLiNaK were studied. A computational model was developed to analyze the flow and heat transfer features of the salts in the tube, and experiments were conducted to test the heat transfer performance of a representative salt Hitec in the tubes of a salt-oil heat exchanger. Comparison of simulation results with the experimental data shows that the average errors are smaller than ±4%, which validates the simulation model. Based on the model, firstly the influences of heat flux uniformity at the tube outer wall were examined. The results show that the non-uniform wall flux can lead to local high-temperature region but influences little on the flow friction coefficient and the heat transfer performance. Then, the model was utilized to investigate the friction and heat transfer features of the salts under broad ranges of the temperature and the velocity. Comparisons of the simulated heat transfer results with Hansen's, Sider-Tate's and Gnielinski's correlations show that the largest errors can reach +25%, +13% and-15%, respectively. Furthermore, the errors between the simulated friction coefficients and the Filonenko's correlation are smaller than ±2%, which indicates that this correlation is suitable for predicting the friction of the salts. Finally, to predict the heat transfer performance more accurately for these representative salts, a new correlation was developed. It was found that the errors between all simulation results and the proposed correlation are smaller than ±5%, while the corresponding values for 80% experiment data of three salts are also lower than ±5%. The current study can offer beneficial results and correlation for the applications of liquid salts in energy systems.

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Section: Heat Fluxes On Tube Wall and Liquid Saltsmentioning

confidence: 99%

Numerical and experimental study on heat transfer and flow features of representative molten salts for energy applications in turbulent tube flow

Qiu

Sun

et al. 2019

International Journal of Heat and Mass Transfer

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“…where Se is the area of the local element. , , , , (13) After that, the procedures including non-dominated sorting, crowding distance sorting, and tournament selection, crossover, mutation, recombination and selection are applied to produce the new population from the old one. This process will be repeated for plenty of generations.…”

Section: Optical Model Based On Monte Carlo Ray Tracingmentioning

confidence: 99%

“…The combustion of fossil fuels has resulted in not only the tight global energy supply but also serious global environmental issues like air pollution and global warming [1][2][3][4][5][6][7]. For solving these problems, renewable energy technologies [8,9], including Concentrating Solar Power (CSP) [10,11], wind power [12], photovoltaic [13,14], hydrogen energy [15,16] and fuel cell technology [17][18][19], etc., are considered to be highly competitive candidates [20]. Among these candidates, the CSP technology is considered as a promising option [21][22][23] which mainly includes Linear Fresnel Reflector (LFR) [24], parabolic trough collector [25][26][27][28][29][30][31], solar power tower [32][33][34][35][36][37], and parabolic dish collector [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

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Aiming strategy optimization for uniform flux distribution in the receiver of a linear Fresnel solar reflector using a multi-objective genetic algorithm

et al. 2017

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International audienceNon-uniform solar flux may lead to negative effects in the receiver of the linear Fresnel reflector (LFR), including the failure of the receiver and the fluctuating operation. For reducing these effects, an aiming strategy optimization approach is presented by combining a multi-objective Genetic Algorithm (GA) and Monte Carlo ray tracing to homogenize the flux distribution in current work. Both the flux non-uniformity index and the optical loss (ηloss) are used as the objective functions. Based on the approach, first, the flux distributions in the Multi-Tube Cavity Receiver (MTCR) and the Single-Tube Receiver with a Secondary Collector (STRSC) are optimized at a typical condition. Optimal results indicate that the GA optimization strategy (S2) can reach a compromise between the flux non-uniformity and the optical loss in both MTCR and STRSC systems. Furthermore, the optimal strategy obtained at a specific transversal incidence angle can be applied in a relatively large range around it. Moreover, parameter study indicates that the aiming line number (naim) has little impact on the efficiencies of the two systems. naim has almost no effect on the flux non-uniformity in the MTCR, but the effect is visible in the STRSC. Finally, the application of S2 under a real-time condition indicates that fluxes in the two receivers can be homogenized efficaciously in the whole time range with a small drop of 0.2–3.8 percentage points in efficiency compared with those of traditional one-line aiming strategy (S1). It is also found that the flux non-uniformity indexes of the MTCR are greatly reduced from 0.77–1.09 to 0.02–0.06 when S1 is replaced by S2, and those of the STRSC are steeply reduced from 0.59–0.70 to 0.29–0.37. It is concluded that the present approach is effective and suitable for homogenizing the fluxes in the receivers of LFRs

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“…Zhou et al analysed the wider‐spectrum effect on the overall performance with the nanostructure and the output power increased by 9.1% via modifying the heat transfer configuration of the module. Further, Zhou et al presented a hybrid PV‐TE device employing the bionics nanostructure and Fresnel solar concentrator. They combined the Monte Carlo method and the finite difference time domain method to analyse the solar irradiance distributions on the upper surface of the PV‐TE.…”

Section: Introductionmentioning

confidence: 99%

Simulation and experiment of a PV‐MCHP‐TE system and ambient parameters impacts

Zhou

Liu

2020

Int J Energy Res

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Summary Combining the photovoltaic (PV) with the thermoelectric (TE) can obtain higher electrical outputs, because the thermal energy produced by the PV cells can be used to produce more electricity by the TE device. This paper built the mathematical model on the energy flow of the PV–microchannel heat pipe (MCHP)–TE system then verified the correctness of the model via the experiment. In addition, the impacts of the different wind speed, different solar radiation, and different ambient temperature on the PV‐MCHP‐TE system have been analysed. The result shows that the maximum difference value of the power output between the simulation and experiment is 0.16 W, so the simulated values and experimental values are in good agreement. At the same time, within the scope of the ambient parameters set in the simulation, when the solar radiation raises, the electrical efficiency of the PV‐MCHP‐TE system decreases, but when the wind speed raises, the electrical efficiency of this system will decrease more and more slowly. This work will lay the foundation for the performance forecasting of the system throughout the year.

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Multi-scale investigation on the absorbed irradiance distribution of the nanostructured front surface of the concentrated PV-TE device by a MC-FDTD coupled method

Cited by 31 publications

References 34 publications

Numerical and experimental study on heat transfer and flow features of representative molten salts for energy applications in turbulent tube flow

Numerical and experimental study on heat transfer and flow features of representative molten salts for energy applications in turbulent tube flow

Aiming strategy optimization for uniform flux distribution in the receiver of a linear Fresnel solar reflector using a multi-objective genetic algorithm

Simulation and experiment of a PV‐MCHP‐TE system and ambient parameters impacts

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