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.
The great grey owl or great gray owl (Strix nebulosa) is a very large owl, documented as the world's largest species of owl by length. It is distributed across the Northern Hemisphere. In some areas it is also called Phantom of the North, cinereous owl, spectral owl, Lapland owl, spruce owl, bearded owl, and sooty owl.he underparts are light with dark streaks; the upper parts are grey with pale bars. This owl does not have ear tufts and has the largest facial disc of any raptor. In terms of length, the great grey owl is believed to exceed the Eurasian eagle-owl and the Blakiston's fish owl as the world's largest owl.