Periodically refreshed quantum thermal machines

We introduce unique class of cyclic quantum thermal machines (QTMs) which can maximize their performance at the finite value cycle duration $\tau$ where they are most irreversible. These QTMs based on single-stroke thermodynamic cycles realized by non-equilibrium steady state (NESS) so-called Periodically Refreshed Baths (PReB) process. find that such interpolate between standard collisional QTMs, consider repeated interactions with single-site environments, and autonomous operated simultaneous coupling to multiple macroscopic baths. discuss physical realization processes show implementation requires a number copies Interestingly, maximizing operating in irreversible point as function comes cost increasing complexity realizing regime, latter quantified increase baths required. demonstrate this physics considering simple example. also an elegant description PReB process for Gaussian systems terms discrete-time Lyapunov equation. Further, our analysis reveals interesting connections Zeno anti-Zeno effects.