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The classical Carnot heat engine
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A Scuderi cycle is a thermodynamic cycle that is constructed out of the following series of thermodynamic processes:^[1]

• A-B and C-D (TOP and BOTTOM of the loop): a pair of quasi-parallel adiabatic processes
• D-A (LEFT side of the loop): a positively sloped, increasing pressure, increasing volume process
• B-C (RIGHT side of the loop): an isochoric process

The adiabatic processes are impermeable to heat: heat flows rapidly into the loop through the left expanding process, resulting in increasing pressure while volume is increasing; some of it flows back out through the right depressurizing process; the remaining heat does the work.