Can a Carnot cycle be irreversible

Circular processes

At the beginning of this playlist we want to explain to you what a Circular process is and which species of processes there are.

  • Types of thermodynamic cycle processes
    in the text
  • Example of the clockwise cycle
    in the text
  • Open and closed cycle process
    in the text

Types of thermodynamic cycle processes

In the thermodynamics various status changes are initiated Working media from. In cyclical processes there are several periodically ongoing changes of state. That means that over and over again the Initial state is achieved.

The thermodynamic parameters how Pressure, volume, temperature and entropy so always reach the initial state.

Reversible and irreversible cycle processes

We can use circular processes in p-V and T-S diagrams represent. It is important that the Away looks different than that at a state point way back. In the p-V diagram, the curves of the Changes of state a surface bordered, which in reversible processes of the Net work corresponds to.

Reversible processes are ideal thermodynamic changes of state that we turning back can without the systems undergoing permanent changes. In reality, however, the technical processes are irreversible. With them it comes to Energy dissipation, so to one Energy loss, for example through Friction. The cycle processes that we want to consider are, however Comparison processes. Therefore, we do not have to consider the dissipated work.

These comparison processes are used to Efficiency of a circular process and are then used with the ideal theoretical circular process, the Carnot process compared since this the maximum possibleEfficiency owns. After this 2nd law of thermodynamics is this Efficiency theoretically possible, but not entirely achievable in practice.

Clockwise and counterclockwise circular process

We can make a further distinction in the Direction of flow of the circular processes. Here there are Left- and clockwise circular processes. Clockwise circular processes run in Clockwise.

These convert heat into work. One also speaks of Heat engines. Part of the supplied warmth so is in Work converted and the other part is removed from the system at a lower temperature submitted.

The difference between the two quantities of heat is the net work submitted. We get the work because at a low temperature and a low pressure that