Direct steam injection (DSI) heaters inject. steam directly into the circulating water loop. For processes which return the jacket water. below 212Â°F (100Â°C), they achieve 100% heat transfer by using both the sensible and the latent heat of the steam. Above this temperature there is a minimal drop in efficiency. Let us compare the efficiency of an indirect (shell and tube type) heat exchanger to a DSI heater.
Most owls do not migrate but they can be nomadic in searching for the best food sources. Some species, such as the snowy owl, have regular irruptions and will sometimes appear unexpectedly far outside their regular range. A group of owls is called a parliament, wisdom, bazaar or study. Baby owls are called owlets. Owls have been found in the fossil record up to 58 million years ago. The largest recorded owl fossil, Orinmegalonyx oteroi, stood about three feet tall. Owls have long been cultural symbols and they have been found in cave paintings in France, in Egyptian hieroglyphics and even in Mayan art.
Owls are birds from the order Strigiformes, which includes about 200 species of mostly solitary and nocturnal birds of prey typified by an upright stance, a large, broad head, binocular vision, binaural hearing, sharp talons, and feathers adapted for silent flight. Exceptions include the diurnal northern hawk-owl and the gregarious burrowing owl. Owls hunt mostly small mammals, insects, and other birds, although a few species specialize in hunting fish. They are found in all regions of the Earth except Antarctica and some remote islands. Owls are divided into two families: the Strigidae family of true (or typical) owls; and the Tytonidae family of barn-owls.