| Summary: | 碩士 === 淡江大學 === 航空太空工程學系碩士班 === 93 === An effective alternate energy resource has been urgent acquired because of the energy crisis in the world. Therefore, many country, company, or institutes invest a lot of people and money in the development of new energy technologies. The direct methanol fuel cell (DMFC) is prominent to be highly considered the application in the future portable electronics.
The mainly object of this thesis is to illustrate how to design a stable, high performance, and practical DMFC. The first part of this paper is to develop an automatic diagnostic system. The developed system consists of measuring and control parts. The information of voltage, current, power, and temperature of the DMFC could be measured and recorded by the system; the system could also make the controls of the fuel inlet temperature, cathode airflow inlet environment temperature, and DC loading machine.
The second part of this paper is to make the parametric studies on the operating environment as well as the concentration effect to a single-cell DMFC by utilizing the diagnostic system. The environment studies adopted the Taguchi’s method to figure out a better operation condition. The comparison of a DMFC performance under several different methanol concentrations at several specific operating conditions was conducted to get a good concentration range.
In addition, the last part of the thesis is to apply the computational fluid dynamic technique to make a series of designs on the anode and cathode side flow channels. The design on the anode side emphasized the uniformity of the fuel supplying to the cells in the planar DMFC stack, where the non-uniformity could significantly decrease the DMFC performance. The design on the cathode side focused on the uniformity of the airflow velocity, pressure, and temperatures aside of the cells. The ultimate purpose of the research is to provide the methodology to make a good DMFC design under proper operating conditions by integrating the experimental and simulation results.
|
|---|
