FAQ: Which Cycle Produces The Most Efficient Heat Engine Possible?

Which cycle has highest efficiency?

Explanation: Otto cycle is more efficient than Diesel cycle for a given compression ratio. 6. For constant maximum pressure and heat input, the air standard efficiency of the gas power cycle is in the order.

Is the Carnot cycle 100% efficient?

You are probably aware that in the Carnot reversible isothermal expansion the heat provided by the high temperature reservoir equals the work done in the expansion. That process converts heat to work at 100% efficiency. But a process is not a cycle. To operate in a cycle the system has to return to its original state.

Which thermodynamic cycle has maximum efficiency?

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.

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What is the maximum possible efficiency of a 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.

Why Carnot cycle is not possible?

Carnot cycles are not encountered in reality since achieving isothermal heat transfer is very difficult (needs very large heat exchangers and long time). Also process 3-4 requires a pump or compressor that can handle two phase mixture (liquid and vapor) which is impractical.

What is the most efficient heat engine?

The most efficient heat engine cycle is the Carnot cycle, consisting of two isothermal processes and two adiabatic processes. The Carnot cycle can be thought of as the most efficient heat engine cycle allowed by physical laws.

Why is no system 100% efficient?

A system can never be 100% efficient. The reason behind this is because of heat and sound energy are lost in some amount in every system. No matter they are waste or not. So a system doesn’t exist, with 100% efficiency.

Why can a Carnot engine not get 100% efficiency?

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.

Can we consider heat engine 100 Efficient why why not?

Short answer: No. 100 percent efficient engine is not possible. In reality, heat engines are inefficient systems. Another is that not all thermal energy is used by the system, some of it exits the engine as heat, which is not used to produce the force or output that is needed.

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Why is Carnot efficiency less than 1?

The reason the Joule cycle does not achieve the efficiency of the Carnot cycle operating between Ta and Tb is because the temperature of isobaric heat reception and rejection varies as the heat transfer occurs, and a certain amount of potential for work is lost in the irreversible heat transfer processes between the

Is Carnot cycle reversible?

The Carnot heat-engine cycle described is a totally reversible cycle. That is all the processes that compose it can be reversed, in which case it becomes the Carnot refrigeration cycle.

Why is there always some waste heat in a heat engine?

Only part of the energy absorbed as heat can be converted to work. The reason is, that the heat, as it flows in, brings along entropy, which must somehow be disposed of before the cycle can start over. To get rid of the entropy, every heat engine must dump some waste heat into its environment.

Why are heat engines inefficient in general?

Why are heat engines inefficient, in general? a. Temperatures are so high that a great deal of heat is lost to the environment. Heat engines attempt to convert the worst source of energy into the best.

Can a perfectly efficient system ever be created?

The fact is, you can‘t make a super-efficient system without any waste. No matter how good of an engineer you are, you can‘t invent a perfect engine. Take, for example, a heat engine. Simply put, a heat engine is a machine or system that converts heat into other forms of energy.

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How can you increase the efficiency of a heat engine?

1 Expert Answer. Assuming very large heat & cold sinks, you can increase the Carnot efficiency by increasing the hot temperature or by decreasing the cold temperature!

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