Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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3.
6.0" wide wooden fence posts are embedded in a concrete driveway a distance 12.125" apart. There is
a 1/16" gap between the post and the concrete (see diagram). The posts are installed when the temperature is
12°C. Determine if the gap will close when the temperature increases to 32°C and if not how big the gap will
be at that temperature. The thermal expansion coefficients of wood and concrete are awood =32 x 105 °C and
aconcrete =13 x 106 °C. 1 inch3D2.54 cm.
6.0"
12.0"
0.0625"
A glass windowpane in a home is 0.62 cm thick and has dimensions of 1.4 m x 1.9 m. On a certain day, the indoor temperatu
24°C and the outdoor temperature is 0°C.
(a) What is the rate at which energy is transferred by heat through the glass?
W
(b) How much energy is lost through the window in one day, assuming the temperatures inside and outside remain
constant?
Suppose you were to build a bridge in the state of Texas. Look over some of the specific heat values for typical building materials. What material do you think you should use when building a bridge here? Why?
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- Question 11 Which statement about thermal conductivity is FALSE? O a. The thermal conductivity of timber is greater in the longitudinal compared to the radial direction. O b. Lower density results in lower thermal conductivity. C. Thermal modification of wood reduces its thermal conductivity. Od. Thermal conductivity of air is higher compared to wood.arrow_forwardAn insulated steam pipe having outside diameter of 3 cm is to be covered with two layers of insulation each having a thickness of 2.5 cm. the thermal conductivity of one material is 5 times that of the other assuming that the steam pipe surface temperature and outer air temperature remain fixed . how much change in heat transfer take place if the better insulating material is next to the pipe than it is on outer side?arrow_forwardcalculate the heat loss through the ceiling, if the R-19 insulation batt is replaced by R-40 fiberglass insulation.arrow_forward
- 80° -Sheathing 70° Gypsum wallboard 60° Fiberglass between studs Siding 50° Air inside room 40° at 72F Air outside at 0F 30° 20° 10° 0 1 2 3 4 5 6 7 Distance through wall (inches) The temperature changes in the wall - Insulation According to the figure materials is the best insulator? The poorest? Explain. which of the Temperature (°F)arrow_forwardQuestion 5 Which statement about electrical conduction in wood is FALSE? O a. Electrical conduction increases very rapidly with increasing wood moisture content. O b. Electrical conduction is generally the same regardless of wood species. O C. Electrical conduction is greatest in the longitudinal direction of wood. Od. Electrical conduction increases with increased wood temperature.arrow_forwardQ2/ How much heat does 50g of aluminum give off as it cools from 100c° to 10c°? for aluminum c=88 J/Kg.c°.arrow_forward
- Parker County Community College (PCCC) is trying to determine whether to use no insulation or to use insulation that is either 1 inch thick or 2 inches thick on its steam pipes. The heat loss from the pipes without insulation is expected to cost $1.50 per year per foot of pipe. A 1-inch thick insulated covering will eliminate 89% of the loss and will cost $0.40 per foot. A 2-inch thick insulated covering will eliminate 92% of the loss and will cost $0.85 per foot. PCCC Physical Plant Services estimates that there are 250,000 feet of steam pipe on campus. The PCCC Accounting Office requires a 10%/year return to justify capital expenditures. The insulation has a life expectancy of 10 years. Determine which insulation (if any) should be purchased using a ranking future worth analysis.arrow_forwardA line measured with a 50-m long steel tape was determined to be 645.22 meter when the average temperature during taping was 15.750C. If the tape is of standard length at 200C and the coefficient of thermal expansion of steel is 0.0000116/10C, the correct length of the measured line isarrow_forwardQ1: A. 6 kg of steel, specific heat capacity 500 J\Kg K, is heated from 59°F to 212°F C. How much heat is required?arrow_forward
- 12. Thermal efficiency using temperature values 13. Thermal efficiency using rc and k valuesarrow_forwardUrgent..... Classify the following materials with regard to their thermal insulation properties, rate them from the best to the worst: Solid concrete block, Burned clay block, clay brick. Cement - sand bricks, light weight blocks, and hollow concrete blocks.arrow_forwardwhy jacketed pipe insulation use for noise reductionarrow_forward
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