| Summary: | 碩士 === 國立東華大學 === 光電工程學系 === 104 === In view of the solar power and other renewable energy sources will help reduce greenhouse gas emissions, can be considered as an alternative to dependence on imported energy from the future, but that sort of renewable energy is part of the tip load power cannot effectively fill a large number of base load electricity demand in Taiwan, so the utilization of renewable energy or the Issues of energy storage is concerned.
In this thesis, the development of a new type of chase solar-type solar cell cogeneration system, in addition to the thermal efficiency of the system of assessed, but also explore the feasibility of the application of thermal energy of the hydrogen fuel cell. Research Integration 120o above flexible viewing angle of linear Fresnel lens element in the cogeneration system, the study compared the single axis and dual-axis tracking system accuracy found uniaxial tracking system with 6o higher precision, in design has scalability and modular unit. Discussion on the change of lighting in the light of the Fresnel lens curvature, after the light is incident from each angle, the lighting changes image map of the linear Fresnel lens via Digital Micrograph software quantized the image contrast can find, in the Fresnel lens curvature = 1 / 39.2, within the lateral measuring range 297 mm, have a greater focus effect than any other curvature parameters, in the season of the region will be 7 hours in focus more than 70 % area. In condenser solar cell analysis measurement study also found that although the linear Fresnel lens rendered cell performance (0.78 W/cm2) below the converging effect of the focusing point of the Fresnel lens (1.31 W/cm2), but with the deflection characteristics, although only single axis tracking the sun, can be wrapped around curved into a cylindrical shape to achieve dual-axis tracking the sun moving effect. Another study of the system in practice, focuses on the environmental characteristics of the atmosphere in Hualien area, the data show that the area within two hours of full sun in winter, the average amount is 827 W/m2, direct sunlight is about 649 W/m2, the diffusion rate is about 21.52 %, especially compared the diffusion rate with the south and the western of Taiwan, there are ideal conditions for the use of condensing. By the linear Fresnel lens focusing system to evaluate the thermal efficiency, the study found that the water temperature in the thermal insulation raised up 7.8 oC in two hours by sunshine, the system average thermal conversion efficiency is 19.3 %. We collect and store the waste heat of cogeneration system, while integrating hydrogen technology and investigate the effects of the proton exchange membrane fuel cell after preheated, when the humidity is 74 %, the proton exchange membrane fuel has maximum short circuit current density (140 mA/cm2) at operating temperature of 40 degrees, was found with increasing temperature can increase the proton exchange membrane fuel cell efficiency, but the accompanying high or low relative humidity could easily lead to mass transfer hindrance.
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