A fuel cell converter, operating on pure hydrogen and oxygen, is required to supply a power output of 750 watts. Electrodes of 0.037 m² active area are used and are separated by an ion-exchange membrane which is 0.002 m thick and has a resistivity of 0.3 ohm-m. The hydrogen and oxygen are supplied to the cell at pressures of 1.8 atm and 1.9 atm respectively, and operation is at a current density of 1200 amp/m². If the Tafel coefficients are= 0.008 volts and ß = 0.1 volts/decade at the operating temperature of 28°C and the contact and circuit resistance voltage drop is 0.04 volts. Find a. The terminal voltage. b. The power output from each cell and the minimum number of cells required. c. The efficiency. d. The amount of thermal energy which is rejected for each kilogram mole of oxygen used.
Analysis of Diode
It is a semiconductor device in electronics applications where only a one-way current is required. It is like a one-way switch that allows current to flow in one direction only. A diode has two terminals, a cathode, and an anode. The cathode is the negative terminal that carries electrons, while the anode is the positive terminal that carries holes. Although no element has holes, it just means that there is a free space for electrons. Diodes are used to convert AC to DC. As we know, AC shifts between positive and negative cycles and DC stays positive constantly. As the diodes allow current only in one direction, they filter out the AC signal’s negative cycle and only keep the positive one.
Working and Construction
In civil engineering, construction means the application of principles of science and mathematics for building bridges, dams, buildings, roads, highways, tunnels, airports, structures, etc. Different branches of science, like physics and chemistry, are extensively applied to design and analysis in construction. Material properties, the science of atmospheric conditions (like solutions, mixtures, etc.), the impact of environmental factors like, corrosion and acidity are some of the primary knowledge of chemistry which are used by civil engineers to carry out construction. Estimation of forces, application of laws of mechanics, fluids mechanics, soil mechanics, etc. are some of the fundamental concepts of physics, which are well applied in construction works. Building construction and structural engineering are two of the most primary areas in civil engineering that parallelly applies principles of both chemistry and physics to carry on construction works.
Property of Diode
An electronic component that facilitates the directional flow of current is known as a diode. According to the direction of the flow of current, the resistance of a diode changes from zero to Infinity.
A fuel cell converter, operating on pure hydrogen and oxygen, is required to supply a power output of 750 watts. Electrodes of 0.037 m² active area are used and are separated by an ion-exchange membrane which is 0.002 m thick and has a resistivity of 0.3 ohm-m. The hydrogen and oxygen are supplied to the cell at pressures of 1.8 atm and 1.9 atm respectively, and operation is at a current density of 1200 amp/m². If the Tafel coefficients are= 0.008 volts and ß = 0.1 volts/decade at the operating temperature of 28°C and the contact and circuit resistance voltage drop is 0.04 volts. Find
a. The terminal voltage.
b. The power output from each cell and the minimum number of cells required.
c. The efficiency.
d. The amount of thermal energy which is rejected for each kilogram mole of oxygen used.
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