1 Saturated Steam At 98 C Passes Through A Copper Pipe 10 M Long And 2 Cm In Diameter Covered With A 2 Cm Thick Layer 1 (69.06 KiB) Viewed 43 times
1 Saturated Steam At 98 C Passes Through A Copper Pipe 10 M Long And 2 Cm In Diameter Covered With A 2 Cm Thick Layer 2 (31.7 KiB) Viewed 43 times
1. Saturated steam at 98°C passes through a copper pipe, 10 m long and 2 cm in diameter, covered with a 2 cm thick layer of insulation of thermal conductivity 1.2 W m-¹ K-¹. The emissivity of the surface of the insulation is 0.7. Heat is lost from the insulated pipe to the air at 10°C with a convection heat transfer coefficient of 20 W m2 K and to the walls at 5°C which can be considered black bodies. The figure below shows the system. Ta 10°C, h=20 W m-2 K-1 Inseam 371K = 0.7 di = 0.02 m Length: = 10 m Tw=5°C do = 0.06 m a) Find the temperature of the surface of the insulation to the nearest °C. Hint: you will need to iterate, having firstly set up the equations as follows: Rate of conduction heat transfer through the insulation Rate of convection heat transfer from surface + Rate of radiation heat transfer from surface AT where Rate of conduction heat transfer through the insulation = R 015 [8 marks]
b) Calculate the proportions of heat lost from the pipe by convection and radiation, and check that these add (approximately) to the conduction heat loss from the pipe to the surface. [2 marks] I c) Calculate the rate (in g s¹) at which the steam condenses in the pipe. [3 marks]
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