| Summary: | 碩士 === 逢甲大學 === 土木工程學系 === 102 === In the scenario of progressive dependence on energy, energy crisis has long been known as one of the critical global issues. Because of the intermittent nature of most of energy utilizations, which requires them to be on demand, the storage of energy is a matter of great importance by comparison. The phase-change material, lauric acid, which has the high latent heat and low melting point of phase-change temperature, is chosen in this study to generate electric power by its latent heat.
We designed a small-surface heat-storage tank for electricity generation according to the previous studies and conducted the experiments of indoor halide lamp and outdoor sunlight to investigate the heat-storage efficiency and thermo-electrical effect.
The results show that the thermal conductivity of thermo-ducts and thermo-plates are applicable. The highest temperature of lauric acid after heat absorption under outdoor sunlight is up to 42.81°C. From the data of measured temperatures, it is obvious that the thermal conductivity of the small heat-storage tank for electricity generation results in the phase-change temperature of lauric acid, but its thermal insulation is not acceptable and its efficiency may be affected by surrounding temperature. While the average voltage of electricity generation is 0.5V in days of bad weather, it is over 1V in days of good weather. The temperature difference between the cold and hot end of a thermo-electric chip is up to 8.54°C in days of bad weather, powering a tail lamp in it full brightness for 1.5 hours. In comparison with that, the temperature difference is up to 11.90°C at most in days of good weather, powering a tail lamp in it full brightness for 5 hours.
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