Why must every heat engine have a cold reservoir?
The cold reservoir provides a heat sink for the excess heat that is rejected after some of the heat is converted into work. We know from the second law of thermodynamics that 100% conversion of heat to work is impossible hence a colder sink is necessary to allow a heat engine to work in the first place.
Is it possible for a heat engine to operate without?
The answer is NO, because without the cooling in condenser the cycle cannot be completed. Every heat engine must waste some energy by transferring it to a low-temperature reservoir in order to complete the cycle, even in idealized cycle.
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. The temperature of sink means a negative temperature on the absolute scale at which the temperature is greater than unity.
Why is heat engine not 100 efficient?
A heat engine is considered to be 100% efficient if only all the heat is converted into useful work or mechanical energy. Since heat engines cannot convert all the heat energy into mechanical energy, their efficiency can never be 100%.
Is Carnot cycle 100 efficient?
All heat engine cycles must reject some heat for an efficiency of less than 100%. The Carnot cycle does this in the most efficient manner. So let us transfer heat from the surroundings to a system by means of a reversible isothermal expansion of an ideal gas.
What is most fuel efficient speed?
65mph
Which power source is most efficient?
Nuclear Has The Highest Capacity Factor This basically means nuclear power plants are producing maximum power more than 93% of the time during the year. That’s about 1.5 to 2 times more as natural gas and coal units, and 2.5 to 3.5 times more reliable than wind and solar plants..
What will energy be like in 2050?
By 2050, solar power could account for 79% of the country’s energy demand, supported by enhanced battery and water storage solutions to lower energy system costs.
What is the cleanest type of energy?
Nuclear energy
What is the biggest source of energy on Earth?
the sun
What is major source of energy?
Abstract. The major energy source in the world is solar energy. Only a small fraction of this energy is absorbed by plants to produce starch, for example, a glucose polymer, via photosynthesis.
Which country has the cleanest energy?
Germany
What is the most dangerous form of energy?
coal
What is the least expensive energy source?
solar PV
Did Tesla get free energy?
Tesla’s long-held dream was to create a source of inexhaustible, clean energy that was free for everyone. One of Tesla’s most extraordinary experiments was to transmit electrical power over long distances without wires or cables — a feat that has baffled scientists ever since.
Can you make free energy with magnets?
In summary, there is no way to obtain free energy with any kind of combination of wires or magnets or switches (commutators, diodes, etc).