composite wall consists of 2” corkboard (inner), 6” concrete and 3” wood (outer). The thermal conductivity of the materials are 0.025, 0.8 and 0.065 Btu/hr-ft-oF. The temperature of the inner surface of the wall is 40oF while the outer surface of the composite wall is 78oF. What is the temperature in oF between cork and concrete and between concrete and wood

composite wall consists of 2” corkboard (inner), 6” concrete and 3” wood (outer). The thermal conductivity of the materials are 0.025, 0.8 and 0.065 Btu/hr-ft-oF. The temperature of the inner surface of the wall is 40oF while the outer surface of the composite wall is 78oF. What is the temperature in oF between cork and concrete and between concrete and wood

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter4: Numerical Analysis Of Heat Conduction

Section: Chapter Questions

Problem 4.12P

See similar textbooks

Related questions

Q: 2Pi KL(Tin-Tout) Q = In- Ri

Q: method of measuring the Thermal Conductivity of an explanatory material,

Q: A-For a general office room, the exposed wall (with a window, outside winter type) construction is…

Q: The walls of a room are 4 m high and 6 m wide. The wall consists of several materials as shown in…

Q: Two walls of a stol composed of insulating materia (k=0.25 KJ/hr-m-°C) with 15 cm thick and concrete…

A: Given For insulating material Thermal conductivity, k1 = 0.25 kJ/hr.m.K…

Q: We will explore an example that connects the basic definitions and equations for different modes of…

Q: 2. One side of a copper block 4 cm thick is maintained at 175-C. The other side is covered with a…

Q: Q1 A composite house wall is constructed from 1.2 cm layer of fiber insulating board, an 8.0 cm…

A: Given Data

Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

A composite wall consists of 2” corkboard (inner), 6” concrete and 3” wood (outer). The thermal conductivity of the materials are 0.025, 0.8 and 0.065 Btu/hr-ft-oF. The temperature of the inner surface of the wall is 40oF while the outer surface of the composite wall is 78oF. What is the temperature in oF between cork and concrete and between concrete and wood?

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

Step 2

Step 3

Step 4

Trending now

This is a popular solution!

Step by step

Solved in 4 steps with 4 images

SEE SOLUTION Check out a sample Q&A here

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

As a designer working for a major electric appliance manufacturer, you are required to estimate the amount of fiberglass insulation packing (k = 0.035 W/m K) that is needed for a kitchen oven shown in the figure below. The fiberglass layer is to be sandwiched between a 2-mm-thick aluminum cladding plate on the outside and a 5-mm-thick stainless steel plate on the inside that forms the core of the oven. The insulation thickness is such that the outside cladding temperature does not exceed 40C when the temperature at the inside surface of the oven is 300C. Also, the air temperature in the kitchen varies from 15Cto33C, and the average heat transfer coefficient between the outer surface of the oven and air is estimated to be 12.0W/m2K. Determine the thickness of the fiberglass insulation that is required for these conditions. What would be the outer surface temperature when the inside surface of the oven is at 475C?
1.63 Liquid oxygen (LOX) for the space shuttle is stored at 90 K prior to launch in a spherical container 4 m in diameter. To reduce the loss of oxygen, the sphere is insulated with superinsulation developed at the U.S. National Institute of Standards and Technology's Cryogenic Division; the superinsulation has an effective thermal conductivity of 0.00012 W/m K. If the outside temperature is on the average and the LOX has a heat of vaporization of 213 J/g, calculate the thickness of insulation required to keep the LOX evaporation rate below 200 g/h.
Thermal Conductivity Problems: a. A wall is made of firebrick 6 inches thick and has a 50°C difference in temperature both sides. Calculate the heat transferred through the wall if the thermal conductivity of the brick is 0.65 BTU/hr-ft- oF. b. Compute the amount of heat flow per second through an iron plate 2 cm thick and the area of 5000 cm² if one face has a temperature of 150°C and the other face is 140°C? The thermal conductivity for iron is 80 W/m-K.
1) A wall section composed from the outside to inside, of concrete brick 100mm thick, an air space of 50mm, two layers of fiberglass insulation 38mm thick, concrete block 150mm thick and air space of 19mm and a gypsum board of 13mm. The exterior conditions are -20C and RH=90% while the interior conditions are 23C and RH=40%. The surface temperature from the outside to inside are shown in the figure. The permeances are: Still Air: µ = 175 ng/pa.s.m Fiber glass: M=2560 ng/pa.s.m? Concrete block: M= 200 ng/pa.s.m? Gypsum board: M= 2000 ng/pa.s.m? Concrete brick: µ = 4.55 ng/pa.s.m Determine if there is a risk of condensation, and if there is, what is the condensation rate? What would happen if a vapor barrier (M=0.2 ng/pa.s.m²) was installed on the warm side of the insulation (Surface 4). 21с 19C 16 С 12C -10 -15C -18C -19C Gyp Air Concrete Fiber Fiber Air Concrete Outdoor Indoor sum block Glass Glass brick 230 19 50 mm -20C 13 150 mm 38 mm | 38 mm 100 mm RH=90% RH=40% mm mm Surf. 1 Surf.…
4. On a winter's day the outside temperature of a 17-in thick concrete wall is -29°F, the wall is 15 ft long and 9 ft high. How many BTUS are required to keep the inside of the wall at 70°F? Assume the thermal conductivity of the wall is 0.8 BTU/h ft°F.
Q2- Water flows inside a steel pipe with an ID of 2.5 cm. The wall thickness is 2 mm, and the convection coefficient on the inside is 100 Wm? C. The convection coefficient on the outside is 10 W/n C. The pipe is covered with a layer of asbestos. 1-determine the thickness of the asbestos layer at the critical insulation radius of the pipe. 2-calculate the change percent of heat transfer with and without the insulation. 3-commet on your results,
QUESTION 2 The wall of a refrigerated truck consists of 1.5mm sheet steel outer surface, 10mm plywood at the inner surface and 20mm of glass wool in between. The inside temperature is -15°C and outside temperature is 24°C. Take the thermal conductivities of the materials as follows: - =0,052W/mK = 23,2W/mK k for glass-wool = 0,14W/mK k for plywood k for steel %3D Calculate: 2.1. the rate of heat flow per unit area; 2.2. the interface temperature. If the glass-wool is replaced by a 5mm cork board with a thermal conductivity of 0.043W/mK; 2.3. What percentage change in heat flow is obtained? 2.4. What must be the thickness of the cork board be, to achieve the same heat flow as in (2.1.).
1.22 A plane wall 0.15 cm thick, of a homogeneous material with k= 0.40 W/m-K, has steady and uniform temperatures T, 20 °C and T = 70°C (sce Fig 1-6). Determine the heat transfer Supplementary Problems area. Ans -133 W/m
A-For a general office room, the exposed wall (with a window, outside winter type) construction is 19 mm plaster outside (cement and sand) and 20 cm brick (building). The area of the window is 50% of the exposed wall. Calculate the heating load required for the office caused by the wall and window. Take Tout-5 °C and Tin-25 °C, exposed wall height=3 m and width=5 m, Inside and outside still air thermal resistance fi= 9.37 W/m²°C and fo= 34.1 W/m2 °C respectively. (6 marks)
Please answer immediately thank you
Q3) A stainless steel straight triangular fin has the thermal conductivity of the material used is 16.3 W/m-K. The base temperature of the fin is 460°C and surface heat transfer coefficient is 28 W/m-K. If the atmospheric air- temperature is 93°C, the thickness is 6.4mm and the length is 25 mm. Find the heat lost from the fin.
QUESTION 2 hot steam pipe (k =16 W/m K) has an inside and outside diameter of 80 mm and 190 mm. If the temperature of the steam is 523 K with h 3000 W/m² K and the outside temperature of the pipe is 353 K. If the pipe is 2 m long compelete the following the thermal resistance of heat transfer by convection is = the conductive heat resistance is the heat transfer per unit length is