Also in a control volume system there is no boundary work. Such as boilers, intercoolers, and heat exchangers. Such as nozzles, diffusers, valves, and pipes.
Ideal process depends on device.
Device Purpose Process Work Heat Turbine Purpose is to produce work through the expansion of a high temperature, high pressure fluid. Pump Purpose is to the boost the pressure of a liquid by applying work on it. Compressor Purpose is to the boost the pressure of a gas by applying work on it. Fan Purpose is to the boost the pressure of a gas by applying work on it. Blower Purpose is to the boost the pressure of a gas by applying work on it.