Hello! In ideal Rankine cycle, we say that during the isobaric expansion, the heat provided to the system is Qin = h3 - h2 However, in my opinion, it is Qin - W = Δh -> Qin - PΔV = Δh. Which is correct? Secondly, In Otto cycle, let's say you have calculated Wnet in kJ/kg. In order to be able to calculate Power, isn't it necessary to know mass flow rate? Thanks!