1. Describe the fundamental difference between facilities for energy storage ver
ID: 1996704 • Letter: 1
Question
1. Describe the fundamental difference between facilities for energy storage versus plants for power generation.
2. The Carnot efficiency assumes isentropic conditions (no losses from randomness). Why is it still impossible to achieve 100% efficiency for a heat engine even in this ideal case?
3. Which heat engine causes the working fluid to go through a phase change? Why isn’t this type of efficient heat engine that produces substantial power more often utilized at small scales?
4. There is an abundance of hydrogen in water. Why can’t electrolyzers be the mechanism for obtaining hydrogen fuel for fuel cells?
5. In the hydrogen economy, from which places are most of the users obtaining the sources for their fuel cells.
Explanation / Answer
1. As we are very much aware of the processes involved in energy generation, indeed we did not produce it but we just convert it into low grade energy into high grade energy.Take the example of a thermal power plant we uses the chemical energy of the coal and utilizing it for the generation of the steam.
In case of energy storage we use accumulator for storing energy.
2.The efficiency of the carnot engine is as below;
1-T2/T1
Where T2 is the sink temperature and the T1 is the source temperature as from the ideal cycle efficiency if it approaches to unity that means the sink temperature is equals to the source temperature it means there is not any heat transfer hence the cycle ceases also it violates the second law of thermodynamics, hence cent percent efficiency is not attainable.
3. In Rankine Cycle the working fluiud undergoes the phase change.
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