Linked from
The 22 pages that link to Thermodynamic cycle, each with the reason it gives.
Diesel engineRelated: Idealized cycles help explain how diesel engines convert heat into work.
EnergyRelated: Cycles convert energy transfers into repeatable engine or refrigeration operation.
Jet propulsionRelated: Air-breathing jet engines use cycles to add heat and extract useful work.
Hess's lawRelated: The enthalpy changes around a closed cycle sum to zero.