# Question: Why Is A System Not 100% Efficient?

## Is Carnot cycle 100 efficient?

Carnot’s interesting result implies that 100% efficiency would be possible only if Tc = 0 K—that is, only if the cold reservoir were at absolute zero, a practical and theoretical impossibility.

PV diagram for a Carnot cycle, employing only reversible isothermal and adiabatic processes..

## What is the most powerful energy source?

nuclear energyNuclear Has The Highest Capacity Factor As you can see, nuclear energy has by far the highest capacity factor of any other energy source. This basically means nuclear power plants are producing maximum power more than 93% of the time during the year.

## What is the most efficient way to produce energy?

Although there are many types of energy, the most efficient forms are renewable: hydro-thermal, tidal, wind, and solar. Solar energy has been proven to be the most efficient and effective among renewable energy sources for home and commercial use.

## Does Carnot engine exist?

A Carnot heat engine is a theoretical engine that operates on the Carnot cycle. The basic model for this engine was developed by Nicolas Léonard Sadi Carnot in 1824.

## 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 …

## What are the two factors of thermal efficiency?

In theory, the factors that affect thermal efficiency (the performance of an engine or the work it has done in relation to the value of heat supplied to it) are the heat input and the heat output. Additionally, temperature variations also come in play, the amount and the rate of losing or gaining heat.

## Is 100% energy efficiency possible?

Generally, energy conversion efficiency is a dimensionless number between 0 and 1.0, or 0% to 100%. Efficiencies may not exceed 100%, e.g., for a perpetual motion machine. However, other effectiveness measures that can exceed 1.0 are used for heat pumps and other devices that move heat rather than convert it.

## Why is the efficiency of a thermodynamic cycle always less than 100 %?

When expressed as a percentage, the thermal efficiency must be between 0% and 100%. Efficiency is typically less than 100% because there are inefficiencies such as friction and heat loss that convert the energy into alternative forms.

## Which energy has lowest efficiency?

coalThe waste of coal or natural gas requires environmental mitigation and an excess of energy. Because of this, the total efficiency of usable energy for coal (the least efficient energy source) is just 29% of its original energy value.

## Which is the cleanest energy?

Out of all energy resources, we consider green power (solar, wind, biomass and geothermal) as the cleanest form of energy….Clean Energy SourcesSolar Energy. Our beautiful bread and butter, solar energy. … Wind Energy. … Bioenergy. … Geothermal Energy. … Hydropower. … Nuclear Energy. … Natural Gas.

## 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.

## Why Carnot engine is most efficient?

The Carnot cycle can be thought of as the most efficient heat engine cycle allowed by physical laws. … This means that the Carnot cycle is an idealization, since no real engine processes are reversible and all real physical processes involve some increase in entropy.

## 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. Hence negative temperature of absolute scale is impossible and we cannot reach absolute 0 temperature. …