Table of Contents
- 1 What happens to the entropy of a Carnot engine?
- 2 How do you find the entropy of a Carnot cycle?
- 3 Why is the Carnot cycle the most efficient for which engine?
- 4 What happens to the entropy of a Carnot engine during the stage where energy is absorbed as heat from a high temperature reservoir?
- 5 Why is it impossible to have a 100\% efficient engine?
- 6 Why can’t we have 100 efficiency?
What happens to the entropy of a Carnot engine?
In order to approach the Carnot efficiency, the processes involved in the heat engine cycle must be reversible and involve no change in entropy. 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.
How do you find the entropy of a Carnot cycle?
The Carnot Cycle is a thermodynamic cycle that consists of four reversible processes: isothermal expansion, adiabatic expansion, isothermal compression, and adiabatic compression. We will now determine the entropy changes in each phase of the cycle. dS=dQT=0, where T is the thermodynamic temperature.
Is entropy produced within a system undergoing a Carnot cycle?
When a system undergoes a carnot cycle, entropy is produced within the system. False, no entropy is produced since it is a reversible cycle.
Why is the Carnot cycle the most efficient for which engine?
Carnot engine posses highest efficiency because of no losses into consideration and runs on reversible processes which yields maximum work output for a given heat input.
What happens to the entropy of a Carnot engine during the stage where energy is absorbed as heat from a high temperature reservoir?
The net change is zero. What happens to the entropy of a Carnot engine during the stage where energy is absorbed as heat from a high-temperature reservoir? It increases.
What is Gibbs Helmholtz function explain in detail?
The Gibbs–Helmholtz equation is a thermodynamic equation used for calculating changes in the Gibbs energy of a system as a function of temperature. The equation states that the change in the G/T ratio at constant pressure as a result of an infinitesimally small change in temperature is a factor H/T2.
Why is it impossible to have a 100\% efficient engine?
It is impossible for heat engines to achieve 100\% thermal efficiency () according to the Second law of thermodynamics. This is impossible because some waste heat is always produced produced in a heat engine, shown in Figure 1 by the term.
Why can’t we have 100 efficiency?
Most machines transfer energy from one place or another, or transform one form of energy (e.g. chemical) into another (e.g. mechanical), but machines can`t create any form of energy. That is why 100\% efficiency in machines shall not be possible.
When a system is adiabatic What can be said about the entropy change of the substance in the system?
Adiabatic processes are characterized by an increase in entropy, or degree of disorder, if they are irreversible and by no change in entropy if they are reversible. Adiabatic processes cannot decrease entropy.