| Summary: | 碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系碩士班 === 95 === In recent years, thermoelectric principle has been introduced to the automobile thermo-electricity type of refrigerator and this type of refrigerator has also become a rapidly developed and commercialized product. Most of all, it is the only type of system that people adopt at present. Nonetheless, in the case of recreational vehicles, the thermo-electricity type of refrigerator can only drive actions of the thermoelectric chip with the aid of model 12V automobile power. As the automobiles stop, however, the thermo-electricity type of refrigerator loses its cooling function simultaneously since the electric power has been cut. In light of this drawback, this thesis aims to replace the thermoelectric cooling system with micro solar cells as another power source. In this way, automobiles will soon start the thermoelectric cooling system after using the solar cell panel to generate electricity at first. This kind of electricity generation is able to replace the traditional model 12V automobile power. With regard to no sunshine, the automobiles are also equipped with micro absorption heat pump systems to replace the battery in the hope of maintaining cooling ability.
In the application of using solar cells to generate electricity, this thesis aims to respectively use computer programs to analyze and simulate the performance of thermo-electricity type and absorbing type systems. Under the circumstances of sunshine, the thesis probes into the relation between solar insolation rates and electric current as well as discusses the influence of electric current on the cooling ability and COPsol (COPsolar). By recognizing the characteristics between solar insolation rates and the maximum cooling ability, we are able to accelerate cooling ability when it is greater or smaller than certain range of solar insolation rates. The result is as following. The optimum electric current (Iopt) produces the maximum COPsol. To increase the temperature difference is futile to COPsol value. But when the hot side temperature reaches 30°C, it has the highest COPsol value, which is about 0.6. As for the LiBr/H2O absorbing type system, the cooling ability decreases as the condenser temperature increases. While at the same condenser temperature, the optimum cooling ability occurs if the generator temperature is higher. Furthermore, the optimum COPAHP (COPAbsorption Heat Pump) value, 0.78, will also occur in the best operation condition.
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