Q: In areas where the air temperature remains below 0°C for
In areas where the air temperature remains below 0°C for prolonged periods of time, the freezing of water in underground pipes is a major concern. Fortunately, the soil remains relatively warm during...
See AnswerQ: A large cast iron container (k = 52 W/m
A large cast iron container (k = 52 W/m⋅K and α = 1.70 × 10−5 m2/s) with 4-cm-thick walls is initially at a uniform temperature of 0&Acir...
See AnswerQ: A highway made of asphalt is initially at a uniform temperature of
A highway made of asphalt is initially at a uniform temperature of 55°C. Suddenly the highway surface temperature is reduced to 25°C by rain. Determine the temperature at the depth of 3 cm from the hi...
See AnswerQ: A thick aluminum block initially at 20°C is subjected to
A thick aluminum block initially at 20°C is subjected to constant heat flux of 4000 W/m2 by an electric resistance heater whose top surface is insulated. Determine how much the surface temperature of...
See AnswerQ: Refractory bricks are used as linings for furnaces, and they generally
Refractory bricks are used as linings for furnaces, and they generally have low thermal conductivity to minimize heat loss through the furnace walls. Consider a thick furnace wall lined with refractor...
See AnswerQ: Thick slabs of stainless steel (k = 14.9 W
Thick slabs of stainless steel (k = 14.9 W/m⋅K and α=3.95 × 10−6 m2/s) and copper (k=401 W/m⋅K and α=117...
See AnswerQ: A thick wood slab (k = 0.17 W/
A thick wood slab (k = 0.17 W/m⋅K and α = 1.28 ×10−7 m2/s) that is initially at a uniform temperature of 25°C is exposed to hot gases at 550°C for 5 min. The heat transfer coefficient between the gase...
See AnswerQ: Consider a homeowner who is replacing his 25-year-old
Consider a homeowner who is replacing his 25-year-old natural gas furnace that has an efficiency of 55 percent. The home owner is considering a conventional furnace that has an efficiency of 82 percen...
See AnswerQ: The soil temperature in the upper layers of the earth varies with
The soil temperature in the upper layers of the earth varies with variations in the atmospheric conditions. Before a cold front moves in, the earth at a location is initially at a uniform temperature...
See AnswerQ: Reconsider Prob. 18–78. Using appropriate software, plot
Reconsider Prob. 18–78. Using appropriate software, plot the soil temperature as a function of the distance from the earth’s surface as the distance varies from 0 m...
See Answer
