During the discharge mode, uniform distributed total heat input of 4 kW was supplied to the heaters in order to simulate approximately adiabatic cooling in an actual receiver. Numerical analysis In order to evaluate the experimental results, a numerical analysis was performed on the basis of the experimental data. Three dimensional heat transfer equations including thermal radiation effects are applied to the numerical analysis. Heat transfer model for the numerical analysis is shown in Figure 7. Heat is radiated from the heaters and transferred to the model storage units and the reflectors. Some fraction of the heat to the reflector is radiated to the vacuum vessel and becomes heat loss of the heaters. The heat transfer equation is shown as follows. where Qr is the heat transfer value, Ar is the area of radiator, fr is the shape factor of the object, a is the Stefan-Boltzmann's constant, Th is the temperature of the radiator and Ti is the temperature of the object.
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