Heat Transfer Problem Solving Assignment

Heat Transfer Problem Solving Assignment

1. At an average temperature of 100 C, hot air flows through a 2.5 m long tube with an inside diameter of 50mm. The temperature of the tube is 20 C along its entire length. Convective film coefficient is 20.1 W/m2 K. Determine the convective heat transfer from air to the tube.

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A. 530 W

B. 431.5 W

C. 631.5 W

D. 831.5 W.

2. The hot combustion gases of a furnace are separated from the ambient air and its surrounding, which are at 25oC, by a brick wall 0.15m thick. The brick has a thermal conductivity of 1.2 W/m-K and a surface emissivity of 0.8. Under steady-state conditions and the outer surface temperature of 100oC is measured. Free convection heat transfer to the air adjoining this surface is characterized by a convection coefficient of 18 W/m2K. What is the brick inner surface temperature in deg C?

A. 230.3

B. 280.2

C. 333.8

D. 352.5

3. One side of a 40 cm stock wall (k=1.5 W/m-K) is exposed to the air whose temperature is 18oC (h=15 W/m2 -K) and the other side is exposed to the furnace gases whose temperature is 900oC (h=15 W/m2 -K). Estimate the heat transfer through the wall per m2 area.

A. 2405

B. 2305

C. 2205

D. 2505

4. At P2.50 per kW-hr, how much will it cost to maintain a temperature of 96oF for 24 hours in a box 2 ft square on each side of the outside temperature is 72oF and the overall heat transfer coefficient for the box is 0.1 Btu/hr-ft2F?

A. 1.01

B. 2.03

C. 3.02

D. 4.01

5. A tank containing liquid nitrogen at -120oC is suspended in a vacuum shell by three stainless steel rods 0.9cm in diameter and 3 meters long with thermal conductivity of 18.3 W/m-C. If the ambient air outside the vacuum shell is 28oC, calculate the magnitude of the conductive heat flow in watts along the support rods.

A. 0.712

B. 0.524

C. 0.152

D. 0.172. Write your analysis paper using APA format guidelines

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