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Consider a PEFC operating with the following specifications:= 40% and the pressure is 4 atm at the anode, and = 20% and the pressure is 6 atm at the cathode.Assume that the gibbs free energy of formation at standard pressure for at 90o C is -233,265 joules.
a) Calculate the Nernst voltage of the PEFC if the operating temperature is 90o C.b) Find the change in Nernst voltage if the cathode pressure is reduced to 3 atm, all else the same.c) Find what the pressure at the cathode would have to be to double the Nernst voltage (yes, it is a big number).Hint: Check the Mench notes posted on blackboard for help. In that book gibbs free energy is calculated from the specific heat. That is not necessary here since it is given, so the problem should be much easier and shorter than what you see in the book.
The stoichiometry, , is defined as the rate of the reactant supplied divided by the theoretical rate required.For example suppose 1 mole of hydrogen is being supplied per second. Then we would expect the amount of charge per second (i.e. the current) to be 2*F= 192,970 columbs/second (obviously that is a unrealistically large).Suppose instead that the current is only about 100,000 A. Then theoretically we should expect that only 100,000/(2*F)=0.52 moles of hydrogen is going through the system. However, due to leakage, crossover, and other losses the theoretical amount is usually not equal to the actual amount.The stoichiometry is then 1.0/0.52=1.92
A selective-repeat (SR) data link layer protocol uses 4 sequence bits to number it's frames. The source, C starts from frame 0 and proceeds following the Sr protocol. Let us start analyzing the frame/ACK transmissions when the first outstanding fr..
A long hallway has three doors, one at each end and one in the middle. A switch is located at each door to operate the incandescent lights along the hallway. Label the switches A, B, and C. Design a logic network to control the lights.
And how long it will take to reach that temperature assuming no heat lost in the process and comments on your results and may research the properties of nichrom wire to determine the resistivity of the wire
Formulate the differential equation model for a motor having inductance L and rotational inertia J, and electrical resistance Rw and frictional resistance Rf, driving a frictional load, Rl.
This would allow the protocol to invalidate a word without logically removing the entire block. What extra complications are introduced into the basic snooping cache coherence protocol if this capability is included
In a 50 KVA, Y connected, 440 V, 3 phase, 50 Hz alternator, the effective armature resistance is 0.25 ohms per phase. Synchronous reactance is 3.2 ohms per phase. Determine at rated load and unity power factor,
One of the ways to look at programming at the assembly-language level is to consider it as putting together code fragments that do various little jobs. (This is a little higher-level than just thinking of it as a sequence of machine instructions.)
A rectangular loop of wire in free space joints point A(1,01,) to point B(3,0,1) to point C(3,0,4) to point D(1,0,4) to point A. The wire carries a current of 6mA, flowing the az direction from B to C. A filamentary curent of 15A flows
Compute the rectangular form of the four-point DFT of the following signal, which is zero for n =4. Compute the inverse DTFT of: X(ω)=sinΩ cosΩ
We need to use asynchronous TDM and combine 50 digital sources. On average only 20% of the sources are active at any time. Each output slot carries 18 bits of data from each digital source. Also 8 extra bits are added to each frame for synchroniza..
In the plane z=5 there is a ring with a 3cm radius with its center on the z axis. The ring has a uniformly distributed charge Q. The origin 0,0,0 is at a small sphere with a mass of 0.5kg and a charge of -Q.
n other case Trackers have the ability to increase power generated by direct radiation by 40 %. However, the cost of installed system (including trackers) will be $2.60 million. Calculate the cost of generated electricity in the second case.
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