Engineering Fundamentals: An Introduction to Engineering
6th Edition
ISBN: 9780357112311
Author: Saeed Moaveni
Publisher: Cengage Learning US
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Chapter 11, Problem 13P
To determine
Find the heat loss through the ceiling.
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A wall of a house, shown in the figure, consists of the items in the accompanying table. If the
inside and outside room temperature are 35°C and 15°C, with an exposed area of 150 m2. The
total R-factor, Heat transfer through the wall and total thermal resistance in the sequence is given
by option
No
Items
Thermal resistance
(R') (°C/W)
1
Outside film resistance
0.5
Face brick
1.8
Cement mortar
2.7
Cinder block
2.5
Air space
1.5
6.
Gypsum board
0.9
7.
Inside film resistance
0.7
234 5
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.
A 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:
Chapter 11 Solutions
Engineering Fundamentals: An Introduction to Engineering
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. 49PCh. 11 - Prob. 51PCh. 11 - Prob. 52PCh. 11 - Prob. 53PCh. 11 - Prob. 54PCh. 11 - Prob. 55P
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- A copper plate, with dimensions of 3 cm × 3 cm × 5 cm (length, width, and thickness, respectively), is exposed to a thermal energy source that puts out 150 J every second, as shown in the accompanying figure. The density of copper is 8900 kg⁄m3 . Assuming no heat loss to the surrounding block,determine the temperature rise in the plate after 10 seconds.arrow_forwardA typical ceiling of a house consists of items shown in the accompanying table. Assume an inside room temperature of 70F and an attic air temperature of 15F, with an exposed area of 1000 ft2. Calculate the heat loss through the ceiling.arrow_forwardCalculate the heat loss from a double-pane glass window consisting of two pieces of glass, each having a thickness of 10 mm with a thermal conductivity of k = 1.3 W/m.K . The two glass panes are separated by an air gap of 7 mm. Assume thermal conductivity of air to be k = 0.022 W/m.K .arrow_forward
- A copper plate, with dimensions of 3 cm x 3 cm × 5 cm (length, width, and thickness, respectively), is exposed to a thermal energy source that puts out 150 J every second, as shown in the accompanying figure. The density of copper is 8900 kg/m³. Assuming no heat loss to the surrounding block, determine the temperature rise in the plate after 10 seconds. 150 J Copper Insulationarrow_forwardHeat Transfer 1. If you have a piece of extruded polystyrene insulation that has an R-value of 5 hr ft?.°F/Btu per inch [or RSI = 0.8805 (m² · K)/W)]. How many inches of extruded polystyrene do you need in your wall if you want it to have an R-value of 20 hr ft2.°F/Btu [or RSI = 3.522 (m² · K)/W)]? L= 4" 2. What is the transfer of vibrational energy due to collisions between neighbouring atoms and molecules in a solid called? a. Conduction b. Convection c. Radiation d. Latent Heat Radiant Energy 3. Absorptance is a measure of the relative amount of radiant energy absorbed by a surface. Does a shiny and smooth polished aluminum surface have a high absorptance (closer to 1), or a low absortptance (closer to 0)? Absorptance is a ratio of the radiation absorbed to the radiation received, and thus is dimensionless. What about reflectance? Are absorptance and reflectance related? 4. Emissivity is a measure of the relative amount of radiant energy emitted by a surface. Does a shiny and smooth…arrow_forward3. A thermometer reading 10°C is brought into a room where the temperature is 18°C ; 1 minute later the thermometer reading is 14°C. how long does it take until the reading becomes 16°C.arrow_forward
- 2Q. Calculate the density, specific weight, and specific volume of air at 120°F and 50 psia.arrow_forwardThe water in a hot water heating system is heated to 76°C. What is thistemperature reading on a Fahrenheit thermometer?arrow_forwardUsing Excel or a spreadsheet of your choice, create a degrees Fahrenheit to degrees Celsius conversion table for the following temperature range: from −40° F to 130° F in increments of 5° F.arrow_forward
- write a program that asks the user to enter the temperature grades for the last ten days with their units. Then the program will calculate the average of these entries and print it in a Celsius degree. (note: the following formula is used to convert Celsius degree to Fahrenheit °F = 9/5 (* C) + 32). Assume the entered temperatures might be either in Celsius or Fahrenheit degrees.arrow_forwardWrite the primary dimensions of each of the following variables from the study of convection heat transfer , showing all your work: (a) heat generation rate g. (Hint: rate of conversion of thermal energy per unit volume); (b) heat flux q. (Hint: rate of heat transfer per unit area); (c) heat transfer coefficient h (Hint: heat flux per unit temperature difference).arrow_forwardAlcohol thermometers can measure temperatures in the range of 100 F to 200 F Determine the temperature at which an alcohol thermometer with a Fahrenheit scale will read the same number as a thermometer with a Celsius scale.arrow_forward
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