A carbon steel pipe (thermal conductivity of 38 W/m oC) with an external diameter of 5 cm and a wall thickness of 4 mm, transports saturated water vapor to an equipment in which water evaporates from the sucrose solution to produce sugar. There are few curves in the system, so you decide to neglect their effects. The ambient temperature in which the pipe is located is 28°C and the temperature of the steam for the pressure in which it is in the line is 120°C. By using an empirical correlation to estimate the convection coefficient of the cooling law of Newton for steam condensing inside tubes you find the value of 15000 W/m 2 oC. This value is so high that we can neglect the resistance to convective transport inside the pipe, if you want, calculate the resistance in question and check. Considering an external convective coefficient of 25 W(m2 oC), we estimate that the water will lose ____________ W/m of pipe. If we want to insulate the pipe with urethane foam (conductivity between 0.016 and 0.02 W / m oC) in order to guarantee a reduction of losses by at least 50%, we must use an insulation thickness of _____________.
A carbon steel pipe (thermal conductivity of 38 W/m oC) with an external diameter of 5 cm and a wall thickness of 4 mm, transports saturated water vapor to an equipment in which water evaporates from the sucrose solution to produce sugar. There are few curves in the system, so you decide to neglect their effects. The ambient temperature in which the pipe is located is 28°C and the temperature of the steam for the pressure in which it is in the line is 120°C. By using an empirical correlation to estimate the convection coefficient of the cooling law of Newton for steam condensing inside tubes you find the value of 15000 W/m 2 oC. This value is so high that we can neglect the resistance to convective transport inside the pipe, if you want, calculate the resistance in question and check. Considering an external convective coefficient of 25 W(m2 oC), we estimate that the water will lose ____________
W/m of pipe. If we want to insulate the pipe with urethane foam (conductivity between 0.016 and 0.02 W / m oC) in order to guarantee a reduction of losses by at least 50%, we must use an insulation thickness of _____________.
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