Why the Carnot engine is the most efficient engine for a given source and sink temperature?
One of the factors determining efficiency is the addition of to the working fluid in the cycle and its removal. The Carnot cycle achieves maximum efficiency because all the heat is added to the working fluid at the maximum temperature.
What is the efficiency of a Carnot engine?
The efficiency of carnot’s engine is 50\%.
What should be the temperature of the sink for efficiency of Carnot engine to be unity?
This means that the cold sink is at a temperature of around 280-300 Kelvin, and the hot sources are from burning fuels burn at a temperature of approximately 1100 Kelvin (although research always tries to drive that temperature higher). These temperatures give a Carnot efficiency value of or so.
Is Carnot efficiency in Kelvin?
Carnot efficiency equation Both Th and Tc are absolute temperatures (expressed in Kelvins). You can also do the calculations manually; in this case, Tc = 25 + 273.15 = 298.15 K . Repeat step 1 for the temperature of the hot reservoir. In this case, Th = 135 + 273.15 = 408.15 K .
Why are Carnot engines not 100 efficient?
In order to achieve 100\% efficiency (η=1), Q2 must be equal to 0 which means that all the heat form the source is converted to work. Hence negative temperature of absolute scale is impossible and we cannot reach absolute 0 temperature. …
What is the efficiency of the engine?
Sadly, even with regular car maintenance such as a tune-up or an oil change, today’s gasoline engines are only around 30 to 35 percent efficient, which means roughly 65 cents out of every dollar you spend on gas goes to waste.
What is the efficiency of heat engine?
Heat engines often operate at around 30\% to 50\% efficiency, due to practical limitations. It is impossible for heat engines to achieve 100\% thermal efficiency () according to the Second law of thermodynamics.
Can a Carnot engine attain 100\% efficiency?
Can a Carnot heat engine attain 100\% efficiency?
Another form of the Second Law of Thermodynamics or Carnot’s Principle is that : It is not possible to make a heat engine whose only effect is to absorb heat from a high-temperature region and turn all that heat into work. In other words, it will never be possible to design a heat engine having 100 per cent efficiency.
What is the Carnot efficiency Mcq?
Carnot engine MCQ Question 2 Detailed Solution The efficiency of the Carnot engine is defined as the ratio of network done per cycle by the engine to heat absorbed per cycle by the working substance from the source.
Is Carnot efficiency the same as thermal efficiency?
Carnot efficiency represents the maximum possible efficiency which can be obtained by a given thermodynamic cycle. It is calculated based strictly on the maximum and minimum temperatures which occur in the cycle. Broadly speaking, thermal efficiency represents the ratio of work energy output to energy input.
Is efficiency of Carnot engine 100\%?
Even carnot heat engine cannot give 100\% efficiency.