  Recent years have seen the flourishing of research devoted to quantum effects
on mesoscopic and macroscopic scales. In this context, in Entropy 2019, 21,
705, a formalism aiming at describing macroscopic quantum fields, dubbed
Reduced State of the Field (RSF), was envisaged. While, in the original work, a
proper notion of entropy for macroscopic fields, together with their dynamical
equations, was derived, here, we expand thermodynamic analysis of the RSF,
discussing the notion of heat, solving dynamical equations in various regimes
of interest, and showing the thermodynamic implications of these solutions.
