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Hot pressurized carbondioxide gas is flowing through a stainless steel tube of di = 12.7 mm inner diameter and length L : The thickness of the tube...

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Heat transfer problem.

a. Determine the exit temperature, Tmo, of the gas flowing within the tube

b. Determine the heat loss from the gas within the tube to the ambient

c. A strong breeze increased the external heat transfer coefficient by 3 times. Comment, with clear reasoning, on whether the heat loss changes significantly (> 20%) under this scenario

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Hot pressurized carbondioxide gas is flowing through a stainless steel tube of di = 12.7 mm
inner diameter and length L :20 m. The thickness of the tube wall is 3.2 mm and the
thermal conductivity of the tube is kmbe = 21 w/m-K. Hot gas enters the tube at an inlet
temperature of Tmi = 550 “C and a mass flow rate of 0.050 kg/s. In order to reduce heat loss,
the tube is covered with a 50-mm-thick layer of high temperature insulation with a thermal
conductivity of km: 1.0 W/m-K. The ambient temperature on the outside of the tube is Tinf =
20 “C and the external heat transfer coefficient, h.., = 30 vval-K. a. Determine the exit temperature, Tmo, of the gas flowing within the tube b. Determine the heat loss from the gas within the tube to the ambient c. A strong breeze increased the external heat transfer coefficient by 3 times.
Comment, with clear reasoning, on whether the heat loss changes significantly (>
20%) under this scenario. Properties of pressurized carbondioxide at relevant temperature and pressure:
Density, p =55 kg/m3 Thermal conductivity, k = 0.055 w/m-K Dynamic viscosity, p. = 3.463 x 10‘5 kg/m-s Specific heat, cp = 1190 Jfkg-K Prandtl number, Pr = 0.7322

Top Answer

a) Exit temp = 351 0 C b) Heat... View the full answer

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