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2 - 2 : A certain superinsulation material having a thermal conductivity of 2 x 1 0 - 4 W / m C is used
: A certain superinsulation material having a thermal conductivity of x
Wm C is used to insulate a tank of liquid nitrogen that is maintained at C;
kJ is required to vaporize each kilogram mass of nitrogen at this temperature.
Assuming that the tank is a sphere having an inner diameter ID of m estimate
the amount of vaporized nitrogen per day for an insulation of thickness of cm
and an ambient temperature of C Assume that the outer temperature of the
insulation is C and that the heat of vaporization of the nitrogen is not a function
of temperature. Since the tanks diameter is large compared to its thickness, treat
the wall as planar with the appropriate area.
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