Theoretical and experimental study on the application of diffuse-reflection concentrators in PV/T solar system

He, Yong; Xiao, Lixian; Li, Lei

doi:10.1002/er.3491

Cited by 8 publications

(10 citation statements)

References 9 publications

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“…6 Also, water cooling can be applied to cool the front side of PV panel. Yongtai et al 5 produced a photothermal conversion model of PV/T solar water heater to optimize the PV cell coverage.…”

Section: Introductionmentioning

confidence: 99%

Simulation of a novel hybrid solar photovoltaic/wind system to maintain the cell surface temperature and to generate electricity

2017

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Summary A hybrid solar photovoltaic/wind system is proposed and investigated theoretically. The hybrid system is based on attaching a converging inclined duct beneath the photovoltaic (PV) panels and directed upward after the end of the panels. A wind turbine is attached at the exit of the converging duct. The converging duct will capture wind currents that at its inlet and enhances these current by buoyancy effect created by the rejected heat from the panels. The mixed convection air flow is used in cooling the PV panels and in generating electricity by driving the wind turbine at the duct exit. A mathematical model is proposed to describe the system hydrodynamic and thermal behavior. In addition to the mixed convection case, the pure free convection case, when there is no wind speed, has been tested. The design of the wind duct capturing system is not included in this study, which should be carefully manufactured to eliminate the reversed flow. The simulation results show that the integration of both systems not only enhances the performance of PV cell due to the effective cooling but also generates more electric power from the inserted turbine. At low wind speeds, it is found that the ducting system helps more in cooling the panels rather than driving the wind turbine. At these low wind speeds, the buoyancy effect may have a significant effect. However, at high wind speeds, the ducting system acts in both cooling the panels and driving the turbine, and at these high speeds, the buoyancy effect is insignificant.

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Section: Introductionmentioning

confidence: 99%

Simulation of a novel hybrid solar photovoltaic/wind system to maintain the cell surface temperature and to generate electricity

2017

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“…Considering PV cell is tightly contacted with absorber plate, the influence of thermal contact resistance can be neglected, and thus, Q pv can be expressed as

Q_{pv} = \frac{A_{pv} ((),, t_{pv} - t_{c})}{\frac{δ_{italicpv}}{λ_{italicpv}} + \frac{δ_{c}}{λ_{c}}},

where δ pv and δ c are the thickness of PV cell and absorber plate, respectively; λ pv and λ c are the thermal conductivity of PV cell and absorber plate, respectively; A pv is the area of PV cell; and t pv and t c are the temperature of PV cell and absorber plate, respectively. It should be noted that PV cell temperature is affected more by solar irradiance, and the correlation between plastic substrate PV cell temperature and solar irradiance can be expressed by

t_{pv} = t_{a} + 27 \times \frac{E_{i}}{800},

where t a is environment temperature and E i is solar irradiance.…”

Section: Heat‐generated Characteristics Of Pv/t Solar Systemmentioning

confidence: 99%

“…where δ pv and δ c are the thickness of PV cell and absorber plate, respectively; λ pv and λ c are the thermal conductivity of PV cell and absorber plate, respectively; A pv is the area of PV cell; and t pv and t c are the temperature of PV cell and absorber plate, respectively. It should be noted that PV cell temperature is affected more by solar irradiance, and the correlation between plastic substrate PV cell temperature and solar irradiance can be expressed by [18]…”

Section: Heat Generated Of Pv/t Solar Collectormentioning

confidence: 99%

Research on the influence of PV cell to thermal characteristics of photovoltaic/thermal solar system

Xiao

2017

Int. J. Energy Res.

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Summary In the paper, we analyzed internal thermal transmission characteristics of water‐heating photovoltaic/thermal (PV/T) solar collector covered by photovoltaic (PV) cell, established photothermal conversion model of PV/T solar system, and analyzed the influence of PV cell coverage to photothermal characteristics of PV/T solar system. Results show that the thermal efficiency of PV/T solar system by optimizing PV cells coverage can reach 68%. In addition, by designing four water‐heating PV/T solar system prototypes with PV cell coverage of 0.4, 0.56, 0.7, and 0.82, respectively, we conducted experimental researches for the four prototypes and found that the four prototypes can achieve thermal efficiencies of 58%, 51%, 64%, and 67%, respectively, in heating 250 L of water to 50°C. The experiment results are consistent with theoretical analysis results, indicating that it is feasible to improve thermal characteristics of PV/T solar system by optimizing PV cell coverage. Copyright © 2017 John Wiley & Sons, Ltd.

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“…He, Xiao, and Li(2016) conducted a theoretical and experimental study on the application of diffuse‐reflection concentrators in PVT system. They showed that using such concentrators will increase the amount of the incident irradiance by 26%, and consequently, the maximum output power was increased by 11%.…”

Section: Introductionmentioning

confidence: 99%

Performance of a hybrid photovoltaic/thermal system utilizing water‐Al ₂ O ₃ nanofluid and fins

Hader

Al‐Kouz

2018

Int J Energy Res

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Summary Innovative hybrid solar panels combining photovoltaic cells along with an efficient heat exchanger with attached fins to the parallel plates and water‐Al2O3 nanofluid as a working fluid is presented in this work. Twenty‐seven fins at the upper wall and 27 fins at the lower wall in labyrinth arrangement are used in simulations with fin lengths of 0, ¼, ½, and ¾ of the flow path height. Moreover, nanosolid particles dispersed in the base fluid range as 0 ≤ ϕ ≤ 0.2. In addition, Reynolds number Re at the inlet was varied such that 10 < Re < 80. Numerical finite element analysis using COMSOL software is utilized to investigate flow and thermal characteristics as well the overall efficiency of the hybrid system. Results show that as the Reynolds number, the length of the fin, and the volume fraction of the nanosolid particles increase, the overall efficiency increases. Moreover, increasing nanoparticle volume fraction and the fin length was found to increase the friction coefficient.

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Theoretical and experimental study on the application of diffuse-reflection concentrators in PV/T solar system

Cited by 8 publications

References 9 publications

Simulation of a novel hybrid solar photovoltaic/wind system to maintain the cell surface temperature and to generate electricity

Simulation of a novel hybrid solar photovoltaic/wind system to maintain the cell surface temperature and to generate electricity

Research on the influence of PV cell to thermal characteristics of photovoltaic/thermal solar system

Performance of a hybrid photovoltaic/thermal system utilizing water‐Al ₂ O ₃ nanofluid and fins

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Theoretical and experimental study on the application of diffuse-reflection concentrators in PV/T solar system

Cited by 8 publications

References 9 publications

Simulation of a novel hybrid solar photovoltaic/wind system to maintain the cell surface temperature and to generate electricity

Simulation of a novel hybrid solar photovoltaic/wind system to maintain the cell surface temperature and to generate electricity

Research on the influence of PV cell to thermal characteristics of photovoltaic/thermal solar system

Performance of a hybrid photovoltaic/thermal system utilizing water‐Al 2 O 3 nanofluid and fins

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Performance of a hybrid photovoltaic/thermal system utilizing water‐Al ₂ O ₃ nanofluid and fins