 Welcome back Mechanica Liya, did you know that the world's largest engine which makes a whopping 109,000 horsepower runs on the diesel cycle? This makes us wonder, what is a diesel cycle? Before we jump in, check out the previous part of this series to learn about what the auto cycle is. Now diesel cycle makes use of spontaneous ignition of fuel from the heat generated during the compression of air in the combustion chamber. It consists of the following processes. Process one is an isentropic compression of the fluid in the form of work done by the piston to compress the air. Process two is the reversible constant pressure heating wherein fuel undergoes combustion. Process three is isentropic expansion where work is done by the fluid to push the piston. This produces usable work. Process four is reversible constant volume cooling wherein the residue exhaust is vented out. The dual cycle as the name suggests is a combination of the auto cycle and the diesel cycle. Here the heat addition occurs partially at constant pressure and partially at constant volume. It consists of the following processes. Process one is a reversible adiabatic compression. Process two is a constant volume heat addition. Process three is a constant pressure heat addition. Process four is a reversible adiabatic expansion and process five is a constant volume heat rejection. Hence we first saw what the diesel cycle is and then went on to learn about what the dual cycle is. Like, subscribe and comment with your feedback to help us make better videos. Thanks for watching. Also thanks a lot for those constructive comments. You helped the channel grow. So here are the top mechanical years of our last videos. In the next episode of MechanicalEI, find out what sterling and erection cycles are.