Therefore, the PV array and its operation conditions are critical to the airship design and capabilities. The efficiency, mass, surface shape, and position of the PV array significantly influence the airship performance, whereas the PV array performance depends on its operation conditions such as latitude, time, temperature, and geometry. This type of power system is actually a photovoltaic (PV) array coupled to an energy storage system. Solar energy is an ideal choice to provide power for high-altitude and long-endurance airships. Currently, United States, Japan, and South Korea are the major countries to develop stratospheric airships. IntroductionĪs a high-altitude platform, stratospheric airships are widely used in many important fields, especially in communication, broadcasting, remote sensing, scientific research, and so forth. In some way, our study can provide helpful support for further engineering applications of flexible thin-film solar cell. Finally, FLUENT is used for modeling and simulation analysis on the flexible thin-film solar cell and MLI, and the simulation results agree well with the experimental data, which validate the correctness of the proposed heat transfer model of MLI. Then, a thermal heat transfer model of flexible thin-film solar cell and MLI is proposed, and the equivalent thermal conductivity coefficients of flexible thin-film solar cell and Nomex honeycomb are calculated based on the environment test and the temperature profile of flexible thin-film solar cell versus each layer of MLI. In this paper, a multilayer insulation material (MLI) is developed first, and low temperature environment test is carried out to verify the insulation effect of MLI. In order to ensure the normal operation of airship platform, the thermal control problem between the flexible thin-film solar cell and the airship envelope should be properly resolved. Flexible thin-film solar cell is an efficient energy system on the surface of stratospheric airship for utilizing the solar energy.
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