EBK ENGINEERING FUNDAMENTALS: AN INTROD
5th Edition
ISBN: 9780100543409
Author: MOAVENI
Publisher: YUZU
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Chapter 11, Problem 37P
To determine
Find the heat loss through the wall.
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A 1,065 ft², 7 in. thick concrete wall has inside and outside surface temperatures of 25°C and 9°C. A 2 in. insulation batt with a thermal conductivity of k = 0.03 Btu/(h· ft· °F) is added
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What is the thickness of the insulation in meters?
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An 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?
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Chapter 11 Solutions
EBK ENGINEERING FUNDAMENTALS: AN INTROD
Ch. 11.2 - Prob. 1BYGCh. 11.2 - Prob. 2BYGCh. 11.2 - Prob. 3BYGCh. 11.2 - Prob. 4BYGCh. 11.2 - Prob. 5BYGCh. 11.2 - Prob. BYGVCh. 11.4 - Prob. 1BYGCh. 11.4 - Prob. 2BYGCh. 11.4 - Prob. 3BYGCh. 11.4 - Prob. 4BYG
Ch. 11.4 - Prob. BYGVCh. 11.6 - Prob. 1BYGCh. 11.6 - Prob. 2BYGCh. 11.6 - Prob. 3BYGCh. 11.6 - Prob. 4BYGCh. 11.6 - Prob. BYGVCh. 11 - Prob. 1PCh. 11 - Prob. 2PCh. 11 - Alcohol thermometers can measure temperatures in...Ch. 11 - Prob. 4PCh. 11 - Prob. 5PCh. 11 - Prob. 6PCh. 11 - Prob. 7PCh. 11 - Prob. 8PCh. 11 - Calculate the R-value for the following materials:...Ch. 11 - Calculate the thermal resistance due to convection...Ch. 11 - Prob. 11PCh. 11 - Prob. 12PCh. 11 - Prob. 13PCh. 11 - Estimate the change in the length of a power...Ch. 11 - Calculate the change in 5 m long copper wire when...Ch. 11 - Prob. 16PCh. 11 - Prob. 17PCh. 11 - Prob. 19PCh. 11 - Prob. 20PCh. 11 - Prob. 23PCh. 11 - Prob. 24PCh. 11 - Prob. 26PCh. 11 - Prob. 27PCh. 11 - Prob. 28PCh. 11 - Prob. 29PCh. 11 - Prob. 30PCh. 11 - Prob. 31PCh. 11 - Prob. 32PCh. 11 - Prob. 33PCh. 11 - Prob. 34PCh. 11 - Prob. 35PCh. 11 - For Problems 11.11, 11.12, and 11.13, calculate...Ch. 11 - Prob. 37PCh. 11 - Prob. 38PCh. 11 - Prob. 39PCh. 11 - Prob. 40PCh. 11 - Prob. 41PCh. 11 - Prob. 42PCh. 11 - Prob. 43PCh. 11 - Prob. 44PCh. 11 - Prob. 45PCh. 11 - Prob. 46PCh. 11 - Prob. 47PCh. 11 - Prob. 48PCh. 11 - Prob. 49P
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- A typical exterior masonry wall of a house, as shown in the accompanying, consists of the items in the accompanying table. Assume an inside room temperature of 20º C and an outside air temperature of −12º C, with an exposed area of 15 m2 . Calculate the heat loss through the wall.arrow_forwardA double-pane glass window consists of two pieces of glass, each having athickness of 8 mm, with a thermal conductivity of k = 1.4 W⁄m ⋅ K . The twoglass panes are separated by an air gap of 10 mm, as shown in Figure 11.10 .Assuming the thermal conductivity of air to be k = 0.025 W⁄m ⋅ K , determinethe total R-value for this window. The total thermal resistance of the window is obtained by adding the resistance offered by each pane of glass and the air gap in the following manner:arrow_forwardDuring winter, when people are in a well-insulated house,they usually feel comfortable if the air temperature is near22°C (72°F). If you have ever spent a night in a poorly insulatedcabin in winter, however, you will recognize that paradoxically,when people are in poorly insulated buildings, they often feelchilly even when the air inside is heated to 22°C or higher. Oneimportant reason for the difference in how warm people feel inthe two sorts of buildings is that even if a well-insulated andpoorly insulated building are identical in the air temperatureinside, they differ in thermal-radiation heat transfer. Specifically,a person standing in the two types of buildings experiencesdifferent heat exchange by thermal radiation in the two. Explainhow thermal-radiation heat transfer accounts for the sense ofchill in the poorly insulated building. (Hint: Think of the outerwalls of the two types of buildings, and think specifically of thetemperatures of the interior surfaces of those walls.)arrow_forward
- 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?arrow_forwardA fluid enters a device steadily at 35 m/s, 200 kPa and 65C and exits at 240 m/s and 95 kPa. The heat transferred from the device to the surrounds at 17C is founded to be 3 kJ/kg. If the exit velocity is varying from 100 to 300 m/s, determine the exit temperature and exergy destroyed and plot the results. Take the fluid is Air. Please solve the above question with EES only.arrow_forwardDetermine the thermal resistance R′ and the R-value for the glass window ofThe thermal resistance R′ and the R-value of the window can be determined from as shown , respectively.arrow_forward
- 12. Thermal efficiency using temperature values 13. Thermal efficiency using rc and k valuesarrow_forwardA glass of a hot water has an initial temperature 80°C, placed in a room where the temperature is 30°C. After one minute the water temperature drops to 70°C. What will be the temperature after 3 minutes? At what time the water cools down to 40°C?arrow_forwardthe answer for a is 40.3 degree Celsius. please answer letter B only. thank youarrow_forward
- 4. In a cold storage plant, it is desired to determine whether to use insulation two inches thick or three inches thick in insulating the walls of the cold storage ware house. Heat absorb through the walls without insulation would cost P96.00 per year per square meter. A two-inch insulation will cost P30.40 per square meter and will cut out 89% of the loss. A three-inch insulation will cut out 92% of the loss and will cost P65.00 per square meter. Using a life 15 years for the insulation with no salvage value and a minimum attractive return of 8%, what thickness of insulation should be used?arrow_forwardThe duct shown must be wrapped with insulation. The width of the insulationis designed to wrap completely around the duct. Find in feet and inches thelength of insulation needed to complete the job.arrow_forwardParker 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_forward
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