A fuel cell is an electrochemical energy conversion device which is typically two to three times more efficient than an internal combustion engine in converting fuel to power. Fuel cells are generally classified according to the type of membrane (polymer electrolyte membrane fuel cells (PEMFC), molt...
A fuel cell is an electrochemical energy conversion device which is typically two to three times more efficient than an internal combustion engine in converting fuel to power. Fuel cells are generally classified according to the type of membrane (polymer electrolyte membrane fuel cells (PEMFC), molten carbonate fuel cells (MCFC), etc.) they use. One of the most promising fuel cells are the so-called polymer electrolytic membrane or proton exchange membrane (PEM) fuel cells. The polymer electrolyte membrane is a solid, organic polymer, usually poly (perfluorosulfonic) acid. The most frequently used PEM is made of NafionTM produced by DuPont. In polymer electrolyte membrane fuel cell, fuel (e.g. hydrogen gas) and oxidant (e.g. oxygen gas from the air) are used to generate electricity, while heat and water are typical byproducts of the fuel cell operation. A fuel cell typically works on the following principle: as the hydrogen has flows into the fuel cell on the anode side, a platinum catalyst facilitates oxidation of the hydrogen gas which produces protons (hydrogen ions) and electrons. The hydrogen ions diffuse through a membrane (the center of the fuel cell which separates the anode and the cathode) and, again with the help of a platinum catalyst, combine with oxygen and electrons on the cathode side, producing water. Recently, automobile manufacturers are developing direct hydrogen, polymer-electrolyte membrane fuel cell systems (PEMFC) to provide traction power for passenger vehicles because of their promise of zero tailpipe emissions and improved fuel economy. Use of hydrogen for transportation also opens the window of opportunity for alternative infrastructure fuels including natural gas and biomass. lead acid battery for hybrid electric vehicle has drawbacks to charge the battery because of high dependency. Therefore, fuel cell electric vehicle using the hydrogen gas is presented to solve the remaining problem of the hybrid electric vehicle system. Of all kinds fuel cell, PEMFC has more high power that any other fuel cell. Therefore, it attracts high attention in the field of electricity business as well as automotive industry. This study analyzed from all angles that the high efficient and low pollutant release fuel cell vehicle in the status quo is researched into a matter. Fuel cell electric vehicle system is designed for the appropriate operation using DC motor which contains DC-DC converter and other controlling circuits. Fuel cell simulation is executed using the finite element methods. Performance enhancement scheme is devised that membrane electrode assembly(MEA) which is the main part of the fuel cell electric vehicle system is experimented through temperature, flow rate and humidification variation. Fuel cell electric vehicle technology is accumulated through the performance experiment which is made of small and large capacity application. As a result, when the fuel cell operating temperature is 75~80℃, performance is maximized in its operation. V-I and V-P performance curve is obtained through the fuel cell performance analysis for the vehicle according to the fuel cell operating condition which is consists of a couple of unit cell(200㎠) As described in above, this dissertation represents the fuel cell electric vehicle for the high power density using performance simulation and small PEMFC.
A fuel cell is an electrochemical energy conversion device which is typically two to three times more efficient than an internal combustion engine in converting fuel to power. Fuel cells are generally classified according to the type of membrane (polymer electrolyte membrane fuel cells (PEMFC), molten carbonate fuel cells (MCFC), etc.) they use. One of the most promising fuel cells are the so-called polymer electrolytic membrane or proton exchange membrane (PEM) fuel cells. The polymer electrolyte membrane is a solid, organic polymer, usually poly (perfluorosulfonic) acid. The most frequently used PEM is made of NafionTM produced by DuPont. In polymer electrolyte membrane fuel cell, fuel (e.g. hydrogen gas) and oxidant (e.g. oxygen gas from the air) are used to generate electricity, while heat and water are typical byproducts of the fuel cell operation. A fuel cell typically works on the following principle: as the hydrogen has flows into the fuel cell on the anode side, a platinum catalyst facilitates oxidation of the hydrogen gas which produces protons (hydrogen ions) and electrons. The hydrogen ions diffuse through a membrane (the center of the fuel cell which separates the anode and the cathode) and, again with the help of a platinum catalyst, combine with oxygen and electrons on the cathode side, producing water. Recently, automobile manufacturers are developing direct hydrogen, polymer-electrolyte membrane fuel cell systems (PEMFC) to provide traction power for passenger vehicles because of their promise of zero tailpipe emissions and improved fuel economy. Use of hydrogen for transportation also opens the window of opportunity for alternative infrastructure fuels including natural gas and biomass. lead acid battery for hybrid electric vehicle has drawbacks to charge the battery because of high dependency. Therefore, fuel cell electric vehicle using the hydrogen gas is presented to solve the remaining problem of the hybrid electric vehicle system. Of all kinds fuel cell, PEMFC has more high power that any other fuel cell. Therefore, it attracts high attention in the field of electricity business as well as automotive industry. This study analyzed from all angles that the high efficient and low pollutant release fuel cell vehicle in the status quo is researched into a matter. Fuel cell electric vehicle system is designed for the appropriate operation using DC motor which contains DC-DC converter and other controlling circuits. Fuel cell simulation is executed using the finite element methods. Performance enhancement scheme is devised that membrane electrode assembly(MEA) which is the main part of the fuel cell electric vehicle system is experimented through temperature, flow rate and humidification variation. Fuel cell electric vehicle technology is accumulated through the performance experiment which is made of small and large capacity application. As a result, when the fuel cell operating temperature is 75~80℃, performance is maximized in its operation. V-I and V-P performance curve is obtained through the fuel cell performance analysis for the vehicle according to the fuel cell operating condition which is consists of a couple of unit cell(200㎠) As described in above, this dissertation represents the fuel cell electric vehicle for the high power density using performance simulation and small PEMFC.
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