FUND OF ENG THERMODYN-WILEYPLUS NEXT GEN
9th Edition
ISBN: 9781119840589
Author: MORAN
Publisher: WILEY
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
thumb_up100%
Chapter 2, Problem 2.37P
a.
To determine
The temperature at the interface of the two layers.
b.
To determine
The rate of heat transfer through the wall of surface area.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Q1.
Consider a plane wall (thermal conductivity, k = 0.8 W/mK, and thickness, fb1 = 100 mm) of a
house as shown in Fig. Q1(a). The outer surface of the wall is exposed to solar radiation and has
an absorptivity of a = 0.5 for solar energy, or=600 W/m². The temperature of the interior of
the house is maintained at T1 = 25 °C, while the ambient air temperature outside remains at
T2 = 5 °C. The sky, the ground and the surfaces of the surrounding structures at this location
can be modelled as a surface at an effective temperature of Tsky = 255 K for radiation exchange
on the outer surface. The radiation exchange inside the house is negligible. The convection heat
transfer coefficients on the inner and the outer surfaces of the wall are h₁ = 5 W/m²-K and
/1₂ = 20 W/m².K, respectively. The emissivity of the outer surface is = 0.9.
T1 = 25 °C
Ţ₁
Too1 = 25 °C
T₁
k
100 mm
Fig. Q1(a)
Assuming the heat transfer through the wall to be steady and one-dimensional:
(a) Solve the steady 1D heat…
A thermal system having a cylindrical form contains a sequence of cylindrical layers is used to cool hot gases. The thermal properties of the
system materials are as follows : k = 231 W/m.K, c = 1033 J/kg.K and the density = 2702 kg/m^3. The gases to be cooled has a temperature
equals to 500 C. Determine the temperature of the system that corresponds to 10 % of the maximum possible heat transfer between the
gas and the system. Consider that the system has a characteristic length equals to 0.03 m. The heat convective coefficient is equal to 50
W/m^2.K. The initial temperature of the system is equal to 20 C.
Select one:
О а. 370 К
O b. 489 K
С. 341 К
d. 410 K
A composite plane wall consists of a 5-in.-thick layer of insulation (ks = 0.029 Btu/h ft. "R) and a 0.75-in.-thick layer of siding (ks =
0.058 Btu/h-ft- ºR). The inner temperature of the insulation is 67°F. The outer temperature of the siding is 0°F. Determine at steady
state (a) the temperature at the interface of the two layers, in °F, and (b) the rate of heat transfer through the wall in Btu/h-ft² of
surface area.
Chapter 2 Solutions
FUND OF ENG THERMODYN-WILEYPLUS NEXT GEN
Ch. 2 - Prob. 2.1ECh. 2 - Prob. 2.2ECh. 2 - Prob. 2.3ECh. 2 - Prob. 2.4ECh. 2 - Prob. 2.5ECh. 2 - Prob. 2.6ECh. 2 - Prob. 2.7ECh. 2 - Prob. 2.8ECh. 2 - Prob. 2.9ECh. 2 - Prob. 2.10E
Ch. 2 - Prob. 2.11ECh. 2 - Prob. 2.12ECh. 2 - Prob. 2.13ECh. 2 - Prob. 2.14ECh. 2 - Prob. 2.15ECh. 2 - Prob. 2.16ECh. 2 - Prob. 2.17ECh. 2 - Prob. 2.1CUCh. 2 - Prob. 2.2CUCh. 2 - Prob. 2.3CUCh. 2 - Prob. 2.4CUCh. 2 - Prob. 2.5CUCh. 2 - Prob. 2.6CUCh. 2 - Prob. 2.7CUCh. 2 - Prob. 2.8CUCh. 2 - Prob. 2.9CUCh. 2 - Prob. 2.10CUCh. 2 - Prob. 2.11CUCh. 2 - Prob. 2.12CUCh. 2 - Prob. 2.13CUCh. 2 - Prob. 2.14CUCh. 2 - Prob. 2.15CUCh. 2 - Prob. 2.16CUCh. 2 - Prob. 2.17CUCh. 2 - Prob. 2.18CUCh. 2 - Prob. 2.19CUCh. 2 - Prob. 2.20CUCh. 2 - Prob. 2.21CUCh. 2 - Prob. 2.22CUCh. 2 - Prob. 2.23CUCh. 2 - Prob. 2.24CUCh. 2 - Prob. 2.25CUCh. 2 - Prob. 2.26CUCh. 2 - Prob. 2.27CUCh. 2 - Prob. 2.28CUCh. 2 - Prob. 2.29CUCh. 2 - Prob. 2.30CUCh. 2 - Prob. 2.31CUCh. 2 - Prob. 2.32CUCh. 2 - Prob. 2.33CUCh. 2 - Prob. 2.34CUCh. 2 - Prob. 2.35CUCh. 2 - Prob. 2.36CUCh. 2 - Prob. 2.37CUCh. 2 - Prob. 2.38CUCh. 2 - Prob. 2.39CUCh. 2 - Prob. 2.40CUCh. 2 - Prob. 2.41CUCh. 2 - Prob. 2.42CUCh. 2 - Prob. 2.43CUCh. 2 - Prob. 2.44CUCh. 2 - Prob. 2.45CUCh. 2 - Prob. 2.46CUCh. 2 - Prob. 2.47CUCh. 2 - Prob. 2.48CUCh. 2 - Prob. 2.49CUCh. 2 - Prob. 2.50CUCh. 2 - Prob. 2.51CUCh. 2 - Prob. 2.52CUCh. 2 - Prob. 2.53CUCh. 2 - Prob. 2.54CUCh. 2 - Prob. 2.1PCh. 2 - Prob. 2.2PCh. 2 - Prob. 2.3PCh. 2 - Prob. 2.4PCh. 2 - Prob. 2.5PCh. 2 - Prob. 2.6PCh. 2 - Prob. 2.7PCh. 2 - Prob. 2.8PCh. 2 - Prob. 2.9PCh. 2 - Prob. 2.10PCh. 2 - Prob. 2.11PCh. 2 - Prob. 2.12PCh. 2 - Prob. 2.13PCh. 2 - Prob. 2.14PCh. 2 - Prob. 2.15PCh. 2 - Prob. 2.16PCh. 2 - Prob. 2.17PCh. 2 - Prob. 2.18PCh. 2 - Prob. 2.19PCh. 2 - Prob. 2.20PCh. 2 - Prob. 2.21PCh. 2 - Prob. 2.22PCh. 2 - Prob. 2.23PCh. 2 - Prob. 2.24PCh. 2 - Prob. 2.25PCh. 2 - Prob. 2.26PCh. 2 - Prob. 2.27PCh. 2 - Prob. 2.28PCh. 2 - Prob. 2.29PCh. 2 - Prob. 2.30PCh. 2 - Prob. 2.31PCh. 2 - Prob. 2.32PCh. 2 - Prob. 2.33PCh. 2 - Prob. 2.34PCh. 2 - Prob. 2.35PCh. 2 - Prob. 2.36PCh. 2 - Prob. 2.37PCh. 2 - Prob. 2.38PCh. 2 - Prob. 2.39PCh. 2 - Prob. 2.40PCh. 2 - Prob. 2.41PCh. 2 - Prob. 2.42PCh. 2 - Prob. 2.43PCh. 2 - Prob. 2.44PCh. 2 - Prob. 2.45PCh. 2 - Prob. 2.46PCh. 2 - Prob. 2.47PCh. 2 - Prob. 2.48PCh. 2 - Prob. 2.49PCh. 2 - Prob. 2.50PCh. 2 - Prob. 2.51PCh. 2 - Prob. 2.52PCh. 2 - Prob. 2.53PCh. 2 - Prob. 2.54PCh. 2 - Prob. 2.55PCh. 2 - Prob. 2.56PCh. 2 - Prob. 2.57PCh. 2 - Prob. 2.58PCh. 2 - Prob. 2.59PCh. 2 - Prob. 2.60PCh. 2 - Prob. 2.62PCh. 2 - Prob. 2.63PCh. 2 - Prob. 2.64PCh. 2 - Prob. 2.65PCh. 2 - Prob. 2.66PCh. 2 - Prob. 2.67PCh. 2 - Prob. 2.68PCh. 2 - Prob. 2.69PCh. 2 - Prob. 2.70PCh. 2 - Prob. 2.71P
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- 5. A pipe with an outside diameter of 2.5 inches is insulated with 2 inches layer of asbestos (k = 0.396 Btu- in/hr-ft²-°F), followed by a layer of cork 1.5 inches thick (k = 0.30 Btu-in/hr-ft²-°F). If the temperature at the inner surface of the pipe is 290°F and at the outer surface of the cork is 90°F, calculate the heat loss per 100 ft of insulated pipe. (Btu/hr)arrow_forwardA composite plane wall consists of a 3-in.-thick layer of insulation (k = 0.029 Btu/h · ft · °R) and a 0.75-in.-thick layer of siding (k = 0.058 Btu/h · ft · °R). The inner temperature of the insulation is 67°F. The outer temperature of the siding is 0°F. Determine at steady state (a) the temperature at the interface of the two layers, in °F, and (b) the rate of heat transfer through the wall in Btu/h-ft2 of surface area.arrow_forwardA composite plane wall consists of a 5-in.-thick layer of insulation (k, = 0.029 Btu/h ft. °R) and a 0.75-in.-thick layer of siding (ks = 0.058 Btu/h ft. °R). The inner temperature of the insulation is 67°F. The outer temperature of the siding is -8°F. Determine at steady state (a) the temperature at the interface of the two layers, in °F, and (b) the rate of heat transfer through the wall in Btu/h.ft² of surface area.arrow_forward
- Two large containers A and B of the same size are filled with different fluids. The fluids in containers A and B are maintained at 0° C and 100° C, respectively. A small metal bar, whose initial temperature is 100° C, is lowered into container A. After 1 minute the temperature of the bar is 90° C. After 2 minutes the bar is removed and instantly transferred to the other container. What is the temperature of the bar at the instant it is transferred?arrow_forward= Consider a large plane wall of thickness L=0.3 m, thermal conductivity k = 2.5 W/m.K, and surface area A = 12 m². The left side of the wall at x=0 is subjected to a net heat flux of ɖo = 700 W/m² while the temperature at that surface is measured to be T₁ = 80°C. Assuming constant thermal conductivity and no heat generation in the wall, (a) express the differential equation and the boundary equations for steady one- dimensional heat conduction through the wall, (b) obtain a relation for the variation of the temperature in the wall by solving the differential equation, and (c) evaluate the temperature of the right surface of the wall at x=L. Ti до L Xarrow_forward8.74. A plate of aluminum which has become heavily oxidized over a period of time is placed in a large enclosure and exposed to a convection environment with h = 40 W/m2 . °C and T = 30°C+ 0.5°C. The plate temperature is measured as 86°C + 0.7°C. Calculate the effective temperature of the large enclosure and estimate its uncertainty.arrow_forward
- Exercise 4.6.2 An insulation system around a cylindrical pipe consists of two different lay- ers. The first layer immediately on the outer surface of the pipe is made of glass wool and the second one is constructed using plaster of Paris. The cylinder diameter is 10 cm and each insulating layer is 1 cm thick. The thermal conductivity of the glass wool is 0.04 W/m°C and that of the plaster is 0.06 W/m °C. The cylinder carries hot oil at a temperature of 92°C, and the atmospheric temperature outside is 15°C. If the heat transfer coefficient from the outer surface of the insulation to the atmosphere is 15 W/m- C, calculate the temperature at the interface between the two insulating materials and on the outer surface.arrow_forwardIn the design of a cold-storage warehouse, the specifications call for a maximum heat transfer through the warehouse walls of 30,000 joules per hour per square meter of wall when there is a 30°C temperature difference between the inside surface and the outside surface of the insulation. The two insulation materials being considered are as follows: Conductivity (J-m/m²-°C-hr) Cost per Cubic Meter $12.50 14.00 Insulation Material 140 Rock wool Foamed insulation 110 The basic equation for heat conduction through a wall is: K(AT) Q = Q=heat transfer, in J/hr/m² of wall K=conductivity in J-m/m2-°C-hr AT =difference in temperature between the two surfaces, in °C L=thickness of insulating material, in meters where Which insulation material should be selected?arrow_forwardThermodynamics A hollow cylindrical insulation of inside diameter 0.2 m and outside diameter 0.4 m conducts heat radially. If another layer of insulation of the same material of thickness of 0.4 m is added, the heat flow wil be changed by what ratio?arrow_forward
- Two rods are horizontally fixed to the rigid walls so that there is a gap of 0.008 inch between them when the temperature is 60°F. The following are the properties of the rods: Property Rod 1 Rod 2 Diameter 1.25 inches 1.25 in Length 3.5 inches 7.5 inches Thermal Coefficient of 9.4 x10-6 /OF 13 x10-6 /°F Expansion Modulus of Elasticity 10 x 103 ksi 18 x 103 ksi a. What is the average stress in the rods if the temperature is increased to 240°F. b. What is the total deformation of the first rod?arrow_forwardA new 1 ft thick insulating material was recently tested for heat resistant properties. The data recorded temperatures of 70 deg. F and 210 deg. F on the cold and hot sides, respectively. If the thermal conductivity of the insulating material is 0.026 Btu/ft . h .⁰ F, calculate the rate of the heat flux,Q/A, through the wall in Btu/ft^2 . h. Resolve the problem in SI units.arrow_forwardWhat is the temperature of a system in thermal equilibrium with another system made up of water and steam at one atmosphere of pressure? Explain your answer using thermal concepts. B Iy A▼ ▼ L E 트 x x, E E 12pt - Paragraph 23 24 2 D ZI C V B FIarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY
Elements Of Electromagnetics
Mechanical Engineering
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:9780134319650
Author:Russell C. Hibbeler
Publisher:PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:9781259822674
Author:Yunus A. Cengel Dr., Michael A. Boles
Publisher:McGraw-Hill Education
Control Systems Engineering
Mechanical Engineering
ISBN:9781118170519
Author:Norman S. Nise
Publisher:WILEY
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Cengage Learning
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:9781118807330
Author:James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:WILEY
Physics - Thermodynamics: (21 of 22) Change Of State: Process Summary; Author: Michel van Biezen;https://www.youtube.com/watch?v=AzmXVvxXN70;License: Standard Youtube License