Abstract
There is a growing interest in a fluidized bed particle receiver that directly irradiates sunlight to particles in the fluidized bed as a solar thermal collector for heating. Thermal performance of directly-irradiated fluidized bed gas heater is strongly affected by the physical properties of the particles. The effect of SiC particle size on heat transfer characteristics in the solar fluidized bed gas heater (50 mm-ID × 100 mm high) has been determined. The outlet gas temperatures showed a maximum value with increasing gas velocity due to the particles motion by bubble behavior in the bed, and the maximum values were found at 3.6 times of Umf for fine SiC and less than 2.0 times of Umf for coarse SiC. Heat absorption from the receiver increased with increasing gas velocity, showing with maximum 18 W for the fine SiC and 23 W for the coarse SiC at 4.5 times of Umf. The thermal efficiency of the receiver increased with increasing gas velocity, but was affected by the content of finer particles. The maximum thermal efficiency of the receiver was 14% for fine SiC and 20% for coarse SiC within the experimental range, but showing higher for the fine SiC at the same gas velocity. A design consideration was proposed to improve the thermal efficiency of the system.
Highlights
To reduce the environmental impact of huge energy-use in industry, companies continue to devote their efforts to using renewable energy
) for determining the is very important to the minimum fluidization velocity
The performance of the system was greatly affected by the physical properties of the particles with an increase in gas velocity
Summary
To reduce the environmental impact of huge energy-use in industry, companies continue to devote their efforts to using renewable energy. Many studies have been conducted to develop the fluidized bed particle receiver and the particles for thermochemical heat storage for the CSP applications [6,7,8]. There have been relatively few studies on the gas heating using this system for the STC application Both applications use the principle of fluidized bed, the direct solar heat transfer to energy storage particles is important in the CPS applications, while the heat transfer of absorbed energy in the solid to the gas is very important [1,4]. Thermal performance experiments were carried out in a directly-irradiated fluidized bed of different particles in the outdoor environment for the application of gas heating. SiC particle size on the thermal efficiency of the preheater has been determined
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