Steam at a temperature of 200 °C flows through a pipe of 5 cm inside diameter and 6 cm outside diameter. The length of the pipe is 30 m. If the steady rate of heat loss per unit length of the pipe is 2 W/m, calculate the heat fluxes at the inner and outer surfaces of the pipe. (12.7 W/m²; 10.6 W/m²)

Consider a steam pipe of length 15 ft, inner radius 2 in., outer radius 2.4 in., and thermal conductivity 7.2 Btu/hr-ft-°F. Steam is flowing through the pipe at an average temperature of 250°F, and the average convection heat transfer coefficient on the inner surface is given to be 1.25 Btu/hr-ft2-"F. If the average temperature on the outer surfaces of the pipe is 160*F, determine the rate of heat loss from the steam through the pipe. ANSWER: Btu/hr

A 4-mm-diameter and 10-cm-long aluminum fin (k= 237 W/m- C) is attached to a surface. If the heat transfer coefficient is 12 W/m^2 ·° C, determine the percent error in the rate of heat transfer from the fin when the infinitely long fin assumption is used instead of the adiabatic fin tip assumption. h, T» D = 4 cm -L = 10 cm

The temperature at the inner and outer surfaces of a boiler wall made of 20 mm thick steel and covered with an insulating material of 5 mm thickness are 300° C and 50° C respectively. If the thermal conductivities of steel and insulating material are 58W/m'C and 0.116 W/m'C respectively, determine the rate of flow through the boiler

In a large chemical factory, hot gases at 2273 K are cooled by a liquid at 373 K with gas side and liquid side convection heat transfer coefficients of 50 and 1000 W/(m2 K), respectively. The wall that separates the gas and liquid streams is composed of 2-cm thick slab of stainless steel on the liquid side. There is a contact resistance between the oxide layer and the steel of 0.05 m2.K/W. Determine the rate of heat loss from hot gases through the composite wall to the liquid.

Oil whose temperature is 30°C is flowed through a pipe with a diameter of 50 cm.  The pipe is in an environment where the temperature is 20°C.  So that not a lot of heat comes out of the pipe, the pipe is wrapped with an insulating material (k = 0.007 W/mK) as thick as 5 cm.  If the convection coefficient of the outer surface of the pipe is 12 W/m²K, calculate the heat flow from the pipe per meter of length.

A 4-mm and 2-m-long electric wire is tightly wrapped with a 2-mm-thick plastic cover whose thermal conductivity is k =0.1 W/m-°C. Electrical measurements indicate that a current of 10 A passes through the wire and there is a voltage drop of 10 V along the wire. If the insulated wire is exposed to a medium at =20 °C with a heat transfer coefficient of h=10 T. W/m2.°C, determine the temperatures T1 and T2 as shown in the figure below. Also determine whether doubling the .thickness of the plastic cover will increase or decrease T2 T

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A steel tube, with a thermal conductivity of 50 W /m K, has an inner diameter of 20-mm and outer diameter of 26-mm. Hot gases flow over the tube with a convection heat transfer coefficient of 200 W/m2 K; while, cold water flows through the tube with a convection heat transfer coefficient of 8000 W/m2 K. What is the cold-side overall heat transfer coefficient in W/m2 K?

Steam at 200ºC flows in a cast iron pipe (k = 80 W/m⋅ºC) whose inner and outer diameters are D1 = 0.20 m and D2 = 0.22 m, respectively. The pipe is covered with 2-cm-thick glass wool insulation (k = 0.05 W/m⋅ºC). The heat transfer coefficient at the inner surface is 75 W/m2⋅ºC. If the temperature at the interface of the iron pipe and the insulation is 194ºC, the temperature at the outer surface of the insulation is