Status of Solar Generator Related Technology Development Activities Supporting the Juice Mission

Baur, C.; Khorenko, V.; Siefer, Gerald; Inguimbert, Virginie; Park, Seonyong; Boizot, Bruno; Bourgoin, J. C.; Casale, Mariacristina; Campesato, R.; Schnell, Hans-Georg; Gerhard, A.; Zanella, Pietro; Ferrando, E.; Reutenauer, X.; Bongers, E.; Gras, A.

doi:10.1051/e3sconf/20171604005

Cited by 10 publications

(3 citation statements)

References 9 publications

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“…The energy conversion efficiency of PV cell η pv varies with temperature (Durisch et al, 1996;Scheiman et al, 1996;Baur et al, 2017). Thus, it is vital to pay attention to the temperature of the airfoil surface, and a thermodynamic model is needed as illustrated in Figure 3.…”

Section: Thermodynamic Model Of Airfoil Surfacementioning

confidence: 99%

Electrical Characteristics of Photovoltaic Cell in Solar-Powered Aircraft During Cruise

Li,

Wang,

Chang

et al. 2022

Front. Therm. Eng.

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Aiming to study the electrical characteristics of photovoltaic cells during the flight of solar-powered unmanned aerial vehicles, this work combines a photovoltaic cell equivalent circuit model and a thermodynamic model. The influence of wing surface temperature and its influencing factor-solar radiation is of primary concern. A solar radiation model is established to explore the impact of solar irradiance on temperature and photovoltaic cell output. Atmospheric temperature and four basic parameters of photovoltaic cell, including open-circuit voltage, short-circuit current, voltage, and current at maximum power point under standard conditions are treated as input parameters. The surface temperature, the variation of output voltage, current, and power are studied with the altitude changing from 0 to 35 km and time from 0 to 24 h in spring equinoxes. Results find that with the increase in altitude, the surface temperature of the photovoltaic cell decreases first and then increases. The voltage of the photovoltaic cell decreases as the temperature increases, and the voltage-time curve varies at altitudes below 25 km and above 30 km. The peak power is available at an altitude between 15 and 20 km. The above findings can be applied to study energy generations and flows of solar-powered vehicles.

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Section: Thermodynamic Model Of Airfoil Surfacementioning

confidence: 99%

Electrical Characteristics of Photovoltaic Cell in Solar-Powered Aircraft During Cruise

Li,

Wang,

Chang

et al. 2022

Front. Therm. Eng.

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“…This dependency can be estimated by either using an electric solar cell model or by approximating experimental data. Here, we follow a second approach by applying a linear approximation to the experimental data of AZUR SPACE triple-junction solar cells, as provided in Baur et al (2017). We assume that the heat-flux discipline is not coupled and can be executed sequentially with no iteration.…”

Section: Discipline Modelsmentioning

confidence: 99%

Gradient-Based Optimization of Spacecraft and Aircraft Thermal Design

Mačiulis

Belevičius

2020

Aviation

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Steady-case thermal analysis plays an important role in dimensioning thermal control systems for spacecrafts and aircrafts. Usually a trial and error approach is used based on engineering judgement and experience. When thermal models become complex or there are conflicting thermal requirements, however, it becomes harder for an engineer to gain insight as to which design decisions will lead to better results. Numerical optimization, on the other hand, could provide a more robust approach for the thermal design of complex spacecraft or aircraft models. In this paper, we suggest a gradient-based multidisciplinary optimization of thermal models where the coupled derivatives of the multidisciplinary system are obtained with the adjoint method. We show that in the case of steady-state thermal analysis, there is an analytic solution of a partial derivatives of implicit heat-transfer equation that can be used to derive total derivatives of the system. We present a practical application of this method by solving a small interplanetary spacecraft thermal optimization problem consisting of one objective, 15 design variables, and 10 constraints. We found that by using gradient-based optimization with exact derivatives, the best results can be achieved by exploring the design space at multiple initial starting points without major computational overhead.

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“…Because of the difficulty to perform irradiation testing at low temperature followed by in‐situ electrical data acquisition under solar illumination, this understanding has been deduced from low temperature measurements performed after room temperature irradiation . With the exception of 1 attempt, the only studies of low temperature irradiation with in‐situ measurements have been performed on TJ cells produced by AZUR SPACE …”

Section: Introductionmentioning

confidence: 99%

Space degradation of 3J solar cells: I—Proton irradiation

Park

Bourgoin

Sim

et al. 2018

Progress in Photovoltaics

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To understand the influence of proton irradiation on lattice-matched GaInP/GaAs/Ge triple junction (TJ) solar cells under low intensity, low temperature (LILT) conditions, we investigated electrical behaviors of top, middle, and bottom component cells together with TJ cells under these conditions. Proton irradiations with energies of 1 MeV and fluences ranging from 2 × 10 10 to 1.6 × 10 12 cm −2 were performed at temperatures ranging from 100 to 300 K. Our study reveals that any of the 3 subcells can become the current limiting cell in the TJ cell, depending on temperature and fluence. In particular, remarkable degradation of the bottom cell at low temperature can make this subcell the current limiting in a TJ cell even for limited fluences. The results indicate that the defect distribution is non-uniform for low temperature irradiation.

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Status of Solar Generator Related Technology Development Activities Supporting the Juice Mission

Cited by 10 publications

References 9 publications

Electrical Characteristics of Photovoltaic Cell in Solar-Powered Aircraft During Cruise

Electrical Characteristics of Photovoltaic Cell in Solar-Powered Aircraft During Cruise

Gradient-Based Optimization of Spacecraft and Aircraft Thermal Design

Space degradation of 3J solar cells: I—Proton irradiation

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