Scuderi cycle

A Scuderi cycle is a thermodynamic cycle that is constructed out of the following series of thermodynamic processes:

A-B and C-D : a pair of quasi-parallel adiabatic processes
D-A : a positively sloped, increasing pressure, increasing volume process
B-C : 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.