Abstract

This paper provides an estimation of the energy parameters of a solar thermophotovoltaic plant with a parabolic-cylindrical concentrator. The thermophotovoltaic frame is formed by gallium arsenide solar cells with an efficiency from 0.25 to 0.33. This efficiency does not decrease under the influence of concentrated solar energy. The combined heat receiver design ensures convective cooling of solar cells, and their residual heat transforms in the steam turbine cycle. A quasi-2D mathematical model of thermophysical processes in the heat receiver is developed. This model considers the ambient conditions and the design features of the receiver system. The mathematical model is implemented in a program code with a built-in iterative procedure. Parametric studies have been carried out and the total coefficient of heat losses of the heat sink has been determined, as well as the influence of the wind potential of the area and the degree of emissivity of solar cells on it. As shown by numerical modeling, the presence of solar cells significantly affects the temperature of the heat transfer fluid along the conduit as well as the dependence of this temperature on the efficiency ratio of solar cells. It is determined that the local heat transfer coefficient hardly depends on the presence of solar cells layer in the circuit. The thermal efficiency of the system and its dependence on the flow rate of the heat transfer fluid are calculated. The resulting dependence allows determining the optimal dynamic parameters for the thermophotovoltaic plant, which guarantee its maximal efficiency. The created mathematical model and numerical results are verified through comparison with the experimental data on the test problem. The proposed algorithm allows conducting several numerical experiments with different optical, thermophysical, and dynamic parameters for rapidly evaluating the general energy characteristics of the thermophotovoltaic plant.

中文翻译：

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带有抛物线形柱状聚光器的太阳能热光伏电站的能量参数估计

摘要

本文提供了带有抛物线形圆柱状聚光器的太阳能热光伏电站的能量参数估计。热光伏框架由砷化镓太阳能电池形成，效率为0.25至0.33。在聚光太阳能的影响下，该效率不会降低。组合式受热器设计可确保对流冷却太阳能电池，并在蒸汽轮机循环中对它们的残留热量进行转化。建立了热接收器中热物理过程的准二维数学模型。该模型考虑了环境条件和接收器系统的设计特征。数学模型是通过具有内置迭代过程的程序代码实现的。已经进行了参数研究，确定了散热器的总热损失系数，以及该区域的风势和太阳能电池的发射率对其的影响。如数值模型所示，太阳能电池的存在显着影响沿导管的传热流体的温度以及该温度对太阳能电池效率比的依赖性。可以确定局部传热系数几乎不取决于电路中太阳能电池层的存在。计算系统的热效率及其对传热流体流速的依赖性。由此产生的依赖关系可以确定热光伏电站的最佳动态参数，从而保证其最大效率。通过与测试问题的实验数据进行比较，可以验证所创建的数学模型和数值结果。所提出的算法允许使用不同的光学，热物理和动态参数进行几个数值实验，以快速评估热光伏电站的总体能量特性。