Editing Isentropic process (section)

=== Isentropic devices in thermodynamic cycles===

{| class="wikitable"
|-
! Cycle !! Isentropic step !! Description
|-
| Ideal [[Rankine cycle]] || 1→2 || Isentropic compression in a [[pump]]
|-
| Ideal [[Rankine cycle]] || 3→4 || Isentropic expansion in a [[turbine]]
|-
| Ideal [[Carnot cycle]] || 2→3 || Isentropic expansion
|-
| Ideal [[Carnot cycle]] || 4→1 || Isentropic compression
|-
| Ideal [[Otto cycle]] || 1→2 || Isentropic compression
|-
| Ideal [[Otto cycle]] || 3→4 || Isentropic expansion
|-
| Ideal [[Diesel cycle]] || 1→2 || Isentropic compression
|-
| Ideal [[Diesel cycle]] || 3→4 || Isentropic expansion
|-
| Ideal [[Brayton cycle]] || 1→2 || Isentropic compression in a [[gas compressor|compressor]]
|-
| Ideal [[Brayton cycle]] || 3→4 || Isentropic expansion in a [[turbine]]
|-
| Ideal [[vapor-compression refrigeration]] cycle || 1→2 || Isentropic compression in a [[gas compressor|compressor]]
|-
| Ideal [[Lenoir cycle]] || 2→3 || Isentropic expansion
|-
|Ideal [[Seiliger cycle]]
|1→2
|Isentropic compression
|-
|Ideal [[Seiliger cycle]]
|4→5
|Isentropic compression
|}

Note: The isentropic assumptions are only applicable with ideal cycles. Real cycles have inherent losses due to compressor and turbine inefficiencies and the second law of thermodynamics. Real systems are not truly isentropic, but isentropic behavior is an adequate approximation for many calculation purposes.