This maintains the heat transfer between steam and liquid to a maximum. Figure 3 shows a temperature profile when saturated steam is used. The difference with the previous diagram is that there is now a layer of condensate on the heating surface and steam temperature is constant.
As a general rule Owls are monogamous - pairs are comprised of one male and one female, neither one of which has any involvement with other nesting birds. With some Owl species the pair bonds last only for the duration of the breeding season, especially if the species involved is dispersive or migratory.
However, sometimes two females may breed with one male if a lot of food is available. Males begin trying to attract a mate in late winter. Breeding pairs may form on the wintering ground or after the owls reach the breeding ground in late April or early May. Snowy owls probably have a different mate each year.