Basically the oven during the cooking process changes its thermodynamic state. It is not possible to
consider steady state conditions, because parameters as work, energy and mass fluxes continuatively
change during the test [13].
Generally speaking, the mass balance applied to a control volume during a transient period is given by
Eq. 5, where the subscript i indicates the inflows, e the outflows, and the subscript cv the control volume.