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Cryogenic Process Engineering (Paperback, Softcover reprint of the original 1st ed. 1989)
Loot Price: R5,221
Discovery Miles 52 210
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Cryogenic Process Engineering (Paperback, Softcover reprint of the original 1st ed. 1989)
Series: International Cryogenics Monograph Series
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Cryogenics, a term commonly used to refer to very low temperatures,
had its beginning in the latter half of the last century when man
learned, for the first time, how to cool objects to a temperature
lower than had ever existed na tu rally on the face of the earth.
The air we breathe was first liquefied in 1883 by a Polish
scientist named Olszewski. Ten years later he and a British
scientist, Sir James Dewar, liquefied hydrogen. Helium, the last of
the so-caBed permanent gases, was finally liquefied by the Dutch
physicist Kamerlingh Onnes in 1908. Thus, by the beginning of the
twentieth century the door had been opened to astrange new world of
experimentation in which aB substances, except liquid helium, are
solids and where the absolute temperature is only a few
microdegrees away. However, the point on the temperature scale at
which refrigeration in the ordinary sense of the term ends and
cryogenics begins has ne ver been weB defined. Most workers in the
field have chosen to restrict cryogenics to a tem perature range
below -150 DegreesC (123 K). This is a reasonable dividing line
since the normal boiling points of the more permanent gases, such
as helium, hydrogen, neon, nitrogen, oxygen, and air, lie below
this temperature, while the more common refrigerants have boiling
points that are above this temperature. Cryogenic engineering is
concerned with the design and development of low-temperature
systems and components.
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