This distribution allows to calculate the energy consumption and therefore energy cost.
It can be seen that in intervals of time when the temperature drops, local heat peak produced energy (enthalpy) is very small (a nearly negligible).
But when the temperature reaches a temperature of phase transitions the enthalpy increases fast and significant in narrow interval of time. We remind that the thermal
capacity in narrow vicinity of the phase transitions temperature is
also increased significantly (see Fig. 4)