Answered: What is the heat loss through a wall…

What is the heat loss through a wall insula with an 8 cm thick layer of mineral wool. The temperature on the inside of the wall is 17°C a outside it is 1ºC. The area of the walls is 12 m2.

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.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.10P: 1.10 A heat flux meter at the outer (cold) wall of a concrete building indicates that the heat loss...

See similar textbooks

Related questions

Q: The wall of a cold room consists of a layer of cork sandwiched between outer and inner walls of…

A: Given Data The heat transfer coefficient is :Q=42 W/m2 Inside temperature is : Ti=-20°C Atmospheric…

Q: A plane wall is 25 cm thick with an area of 1 m2, and has a thermal conductivity of 0.5 W/mK. If a…

Q: 3° A hot sphere having a diamter of 1.5m īs at 30x n a material with k=1.2 WmC and at 30°C. The…

A: Given data→Diameter of sphereD=1.5 mr=D2=1.52=0.75 mTemprature T2=300°CK=1.2Wm-°CTemprature…

Q: Under steady-state conditions, the wall of a brick house is measured to have an inside temperature…

Q: Consider a multi-layered walls of a storage building (no windows) that is made of three layers as…

Q: 'Calculate the energy transfer rate across 6 in. wall of firebrick with a temperature difference…

A: Given data: x=6 in∆T=50=122°Fk=0.65 Btu/hr.ft.°F Need to determine the energy transfer rate.

Q: Q2) A plate having a thickness of 4.0 mm has an internal heat generation of 100MW/m³ and a thermal…

Q: A large concrete wall is 300 mm thick and has a thermal conductivity of 1.2 W/m C. The heat flux…

Q: Heat is generated in a 1.4 m long and 0.2 cm diameter electrical resistance wire placed in the…

Q: In a solid sphere of 0.2 m diameter, heat is generated at the rate of 1.2 x 106 W/m3. The center…

A: It is assumed in the above question that the heat is transferred from the outer surface of the…

Q: W concrete on the outside is 8.00cm thick and has a thermal conductivity of 0.500- m.K W wood on the…

A: givenoutside temp= 7.00°cinside temp=22.00°csurface area of wall= 20.0m3

Q: A glass coffee pot has a 9.00 cm diameter circular bottom in contact with a heating element that…

A: Given data: The bottom diameter of the glass coffee pot, d = 9.0 cm. Heat input rate, Q = 50.0 W.…

Q: I have a 2m diameter rod that is 15m long. I will be putting it underground by 3 meters. The rod has…

A: Given data: ◆ The diameter of the rod: D = 2 m ◆ The length of the rod: L = 15 m ◆ The underground…

Q: The rate of conduction through a cobalt rod 15 mm in diameter and 270 cm long is 1.35 Watts. The…

A: Cobalt rode:one end = Tc = 35oCother end = Th = ?Length = L = 270cmdiameter = d = 15mmKmean of…

Q: A 0.15 m diameter long cylinder is made from a material that can generate heat at the rate of 10…

Q: The internal side of a wall is kept at 100o C and its external side which is exposed to the…

A: T1=100o CT2=10o Ch=10 W/m2 oCK=1.3 W/m oCt=0.4 m

Q: A steel rod is heated from 25 to 250. Its coefficient of thermal expansion is 10-5/°C and E = 100…

A: Given:Thermal expansion coefficiengt of rod,α=10-5/οCHeated from 25οC to 250οCThe rod is free to…

Q: A plane wall is 2m high and 3m wide and is 20cm thick. It is made of a material that has a thermal…

Q: a) A house walls that are 19 cm thick and have an average thermal conductivity four times that of…

A: Solution (a) Given data: The thickness of the house walls, t = 19 cm. The surface area of the…

Q: One end of a 40 cm metal rod 2.0 cm2 in cross section is in a steam bath while the other end is…

Q: Temperature distribution of a wall is given as T(x) = -100x + 50 and the cold surface is exposed to…

Q: 1: In a steel sheet factory, plates in a rectangular shapes are made. One plate is maintained at a…

Q: Q1: In a steel sheet factory, plates in a rectangular shapes are made. One plate is maintained at a…

Q: a) A house walls that are 19 cm thick and have an average thermal conductivity twice that of glass…

A: (A) thickness of wall, dx=19 cm = 0.19 m Thermal conductivity of wall, K = 2*(Thermal…

Q: 4. On a winter's day the outside temperature of a 17-in thick concrete wall is -29°F, the wall is 15…

Q: a) A house walls that are 24 cm thick and have an average thermal conductivity twice that of glass…

A: (a) Write the given data with suitable variables. t=24 cm=0.24 m100 cm1 mA=900000 cm2=90 m210000…

Q: نقطتان )2( A composite walls are constructed from an inner brick wall with thick L1= 25 cm and k1=…

A: Given Data The thickness of the brick is: L1=25 cm=0.25 m The thermal conductivity of the brick is:…

Q: On a winter’s day the outside temperature of a 17-in thick concrete wall is −29°F, the wall is 15 ft…

Q: A multilayer wall has a thermal resistance of 0.0058 ° C / W in the inner layer, 0.28 °C/W in the…

Q: A large concrete wall is 300 mm thick and has a thermal conductivity of 1.2 W/m C. The heat flux…

Q: Insulating material is used to reduce heat loss from the heating furnace walls to the room. The…

A: Write the equation for the rate of heat transfer per unit area. QA=kTi-To∆t Here, Inner and outer…

Q: One side of a copper block 5 cm thick is maintained at 250 C. The other side is covered with a layer…

A: Given, t1 = 5 cm t2 = 2.5 cm T1 = 250 C T2 = 35 C Q = 52 kW

Q: The front window of an automobile has a thickness of 4 mm and is defrosted by the passage of a…

A: Given: The thickness of the window, x = 4 mm The thermal conductivity of glass window, k = 0.78…

Q: Q2 A steel rod is heated from 25 to 250. Its coefficient of thermal expansion is 10-5/°C and E = 100…

A: Given data: - The initial temperature of steel rod is T1 = 25 oC. The final temperature of steel…

Q: A wall in a house contains a single window. The window consists of a single pane of glass whose area…

A: Given data: Ag=0.13 m2tg=8 mmAs=19 m2ts=0.1 m Need to determine the percentage lost by the window.

Q: As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of…

A: The thermal resistance of a cylinder can be calculated using the formula given below- R=12πkLlnrori…

Q: A steam pipe 20cm in diameter is protected with a covering 6cm thick for which the coefficient of…

A: When heat flows radially from inwards to outwards in a cylindrical pipe then, a thermal resistance…

Q: A wall has an area of 10 m2, its thickness is 30 cm, its thermal conductivity is 0.1 W/m. k, then…

Q: I- Rate of heat transfer per unit area (1m) through the composite wall. II- Determine also the…

Q: The inner surface of a plane brick wall is at 60°C and the outer surface is at 35°C. Calculate the…

A: Data given - Ti = 60° C To = 35°C ∆x= 220 mm = 0.22 m K = 0.51 W/m°C.

Q: A finned surface has been added to cool an electronic part. The surface temperature of the…

A: Given: Surface temperature of the electronic part (Ts)=60°CAmbient temperature (T∞)=25°C (assumed…

Q: 2.19 Consider a 300 mm x 300 mm window in an aircraft. For a temperature difference of 80°C from the…

Q: A wall as given in fig is made up of two layers (A) and (B) The temperatures are as shown in the…

A: Here, Temperature at the open surface of A = T1 = 1300 oC Temperature at interface = T2 = 1200 oC…

Question

What is the heat loss through a wall insulated
with an 8 cm thick layer of mineral wool.
The temperature on the inside of the wall is 17°C and on
outside it is 1ºC. The area of the walls is 12 m2.
96 W
0,6 W
O 8 W

Expert Solution

This question has been solved!

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

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps with 2 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

1.1 On a cold winter day, the outer surface of a 0.2-m-thick concrete wall of a warehouse is exposed to temperature of –5°C, while the inner surface is kept at 20°C. The thermal conductivity of the concrete is 1.2 W/m K. Determine the heat loss through the wall, which is 10-m long and 3-m high. Problem 1.1
1.10 A heat flux meter at the outer (cold) wall of a concrete building indicates that the heat loss through a wall of 10-cm thickness is . If a thermocouple at the inner surface of the wall indicates a temperature of 22°C while another at the outer surface shows 6°C, calculate the thermal conductivity of the concrete and compare your result with the value in Appendix 2, Table 11.
One end of a 0.3-m-long steel rod is connected to a wall at 204C. The other end is connected to a wall that is maintained at 93C. Air is blown across the rod so that a heat transfer coefficient of 17W/m2 K is maintained over the entire surface. If the diameter of the rod is 5 cm and the temperature of the air is 38C, what is the net rate of heat loss to the air?
1.76 Explain a fundamental characteristic that differentiates conduction from convection and radiation.
1.4 To measure thermal conductivity, two similar 1-cm-thick specimens are placed in the apparatus shown in the accompanying sketch. Electric current is supplied to the guard heater, and a wattmeter shows that the power dissipation is 10 W. Thermocouples attached to the warmer and to the cooler surfaces show temperatures of 322 and 300 K, respectively. Calculate the thermal conductivity of the material at the mean temperature in W/m K. Problem 1.4
A steam pipe 200 mm in diameter passes through a large basement room. The temperature of the pipe wall is 500C, while that of the ambient air in the room is 20C. Determine the heat transfer rate by convection and radiation per unit length of steam pipe if the emissivity of the pipe surface is 0.8 and the natural convection heat transfer coefficient has been determined to be 10 W/m2K.
Using Table 1.4 as a guide, prepare a similar table showing the orders of magnitude of the thermal resistances of a unit area for convection between a surface and various fluids.
2.38 The addition of aluminum fins has been suggested to increase the rate of heat dissipation from one side of an electronic device 1 m wide and 1 m tall. The fins are to be rectangular in cross section, 2.5 cm long and 0.25 cm thick, as shown in the figure. There are to be 100 fins per meter. The convection heat transfer coefficient, both for the wall and the fins, is estimated to be K. With this information determine the percent increase in the rate of heat transfer of the finned wall compared to the bare wall.
1.51 The inner wall of a rocket motor combustion chamber receives by radiation from a gas at . The convection heat transfer coefficient between the gas and the wall is . If the inner wall of the combustion chamber is at Problem 1.51 a temperature of , determine (a) the total thermal resistance of a unit area of the wall in and (b) the heat flux. Also draw the thermal circuit.
1.37 Mild steel nails were driven through a solid wood wall consisting of two layers, each 2.5-cm thick, for reinforcement. If the total cross-sectional area of the nails is 0.5% of the wall area, determine the unit thermal conductance of the composite wall and the percent of the total heat flow that passes through the nails when the temperature difference across the wall is 25°C. Neglect contact resistance between the wood layers.
A high-speed computer is located in a temperature-controlled room at 26C. When the machine is operating, its internal heat generation rate is estimated to be 800 W. The external surface temperature of the computer is to be maintained below 85C. The heat transfer coefficient for the surface of the computer is estimated to be 10W/m2K. What surface area would be necessary to assure safe operation of this machine? Comment on ways to reduce this area.
1.29 A spherical interplanetary probe with a 30-cm diameter contains electronic equipment that dissipates 100 W. If the probe surface has an emissivity of 0.8, what is its surface temperature in outer space? State your assumptions in the calculations.