Problem-solving. HEAT TRANSFER 1. What is the external heating surface area in square feet of a tube with the following dimensions: tube inside diameter is 5 inch, wall thickness is ½ inch and length is 18 ft. a. 27.28 b. 28.27 c.28.57 d. 27.75 2. The surface of a furnace wall is at a temperature of 1400oC. The outside wall temperature is 50oC. The furnace wall is made of 30cm of refractory material having a thermal conductivity of 1.3 W/m-K. The outside wall is steel, 2cm thick with thermal conductivity of 45 W/m-K. Calculate the thickness in meters of brick to be installed in between the refractory material and steel if its thermal conductivity is 0.35 W/m-K and the heat loss is not to exceed 900 W/m2 a. 0.222 b. 0.333 c. 0.444 d. 0.555 3. In a certain instance, a blossom gets a touch of frost on the strawberries, the harvest was significantly reduced. Consider a very clear night with a slight breeze of about 10 km/hr making the convection coefficient equal to 21 W/m2 -K. The outer space temperature may be assumed to be 110oK and the emissivity of the strawberry is 0.70. At what surrounding temperature will the strawberries freeze? a. 15.02oC b. 13.01oC c. 12.01oC d. 10.22oC 4. Water at an average temperature of 23oC flows through a 10-cm diameter pipe that is 2.5 m long. The pipe wall is heated by steam and is held at 100oC. The convective heat transfer coefficient is 2.25 x 104 W/m2 -K. Find the heat flow in W. a. 13.6 x 105 b. 15.2 x 105 b. 17.5 x 105 b. 21.4 x 105 5. The thermal conductivity of the wall is 5 W/mK. If the inside temperature is 153 deg higher than the outside, determine the thickness of the wall if the heat transmitted is 4.25KW per area. a. 15 b. 16 c. 17 d. 18
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