Answered: Design thickness of the wall to…

Engineering

Mechanical Engineering

Design thickness of the wall to maintain steady heat flux

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.

Chapter2: Steady Heat Conduction

Section: Chapter Questions

Problem 2.54P

See similar textbooks

Related questions

Q: A container used to store ice is made of wood 5.0 cm thick and has an effective area of 12,000 cm2…

Q: HEAT TRANSFER SHOW SOLUTION 4. Consider a solid cylindrical rod of length 0.15m and diameter…

Q: Node at a plane surface with uniform heat flux m, n+ 1 Ay m - 1. n m.n-1 - Ax

A: Please find the solution below

Q: Explain if the heat transfer in the situation can be simplified to steady heat transfer or…

Q: The wall of a refrigerator is made of fiberglass insulation (k = 0.035 W/mK) glued between two 1 mm…

A: Given data: Troom=24°CTs,out=20°Ch=9 W/m2K Need to determine the minimum thickness of fiberglass…

Q: A wall is 6.1 m wide 2.4 m hight and has an overall heat transfer coefficient of 0.4 W/m? °C. It…

A: Given data: - The width of the wall is bw = 6.1 m. The height of the wall is hw = 2.4 m. The…

Q: Calculate the heat loss rate with: A) The uncoated sphere; B) The sphere covered with an insulating…

A: 1. Diameter of the sphere D = 6 cm ==> radius r = 3 cm 2. Atmospheric Temperature T∞= 25 °C 3.…

Q: insulator has a thermal conductivity of 20 W/m ºC s used to separate two heat sinks whose…

Q: Fin increase the heat transfer rates by increasing ………………………….

A: Fin increase the heat transfer rates by increasing …………………………. answer the surfce area of the body

Q: The 5-mm-thick bottom of a 200-mm-diameter pan may be made from aluminum (k= 240 W/m·K) or copper…

A: Given:Heat transfer from the stove to the pan, Q=1200 WDiameter of pan, d=200 mm or 0.2 mthermal…

Q: (example question from slides) A heat pump is to be used to heat a building during the winter. The…

A: Given:TH=21°C =294 KTL=-5°C =268 KQH=135,000 KJ/h

Q: HEAT TRANSFER SHOW SOLUTION 3. Consider a solid cylindrical rod of length 0.15m and diameter 0.05m.…

Q: Copper plate (k=270 w/m k) maintained at 70C in one side and another side at 30 C what is the heat…

Q: In a cylindrical nuclear reactor fuel rod, heat is generated internally according to the equation:…

A: Given data: Rod radius, R=0.0125 mThermal conductivity, k=26 WmKHeat transfer from the surface,…

Q: Calculate the overall heat transfer coefficient of the steel pipe based on the inner surface. The…

A: Heat transfer is given by Q = U*A*dT = (dT/R ) where R is thermal resistance R = (L/KA) and U is…

Q: 3. A 3 in O.D. aluminum tube (k=133 BTU/h ft°F) has 16 longitudinal fins spaced around its outside…

A: Give data: The outer diameter of the tube, do=3 in. The thermal conductivity of aluminum, k=133…

Q: A long water channel is covered with an aluminum cover 8 mm thick and 240 mm wide. The water flowing…

Q: Straight, rectangular cross-section fins made of metal with constant thermal conductivity k = 235…

A: (a) Fin efficiency, ηfin = 80.57%. (b) Heat transfer rate from fin, qfin = 444.83 W.

Q: A single-cylinder air-cooled lawn mower engine operates under steady conditions. The cylinder…

A: Given, Surface temperature, Ts=300°CAmbient temperature, T∞=30°CThickness of fin,…

Q: Energy management and Audit question A steam main 150mm outside diameter containing wet steam at 28…

Q: One side of a copper (401 W/m-oC) block 5 cm thick is maintained at 175 oC, the other side is…

Q: A plane wall of thickness 2L has an internal heat generation that varies according to q = q0 cos…

Q: In the example case of radiator, to enhance heat transfer from hot water to air, the effective…

Q: 32. A bare fuel rod has a diameter of 0.373 in and length of 12 ft. The volumetric heat generation…

Q: Calculate the overall heat transfer coefficient for the following cases: (a) Heat is transferred…

A: a). Given- Area, A=1m2Thickness of plate,t=3cm=0.03mThermal conductivity of steel,Ks=36.4W/mKHeat…

Q: In a way to cool an electronic circuit element The supplied aluminum wings are used. Base…

A: Given Data, L = Length of a aluminum wing = 40 mm = 0.04 m t = Thickness of a aluminum wing = 1 mm =…

Q: e steel. The overall heat-transfer coefficient, considering convection on both sides of the plastic,…

A: given:k=16W/mcthickness t=4mmoverall heat transfer U=120W/m2ctemperature difference across the…

Q: thickness (in meter) of the wall to maintain a steady heat flux of 2500 W/m2 should be

A: Given data;

Q: Obtain a relation for the fin efficiency for a fin of constant cross-sectional area Ac, perimeter p,…

A: Given Data The cross-sectional area of the fin, Ac The perimeter of the fin, p The length of the…

Q: An electric motor is to be connected by a horizontal steel shaft (k - 42.56 W/m.K), 25 mm in…

A: Given: k=42.56W/mkT0=540°CT∞=27°CTL=52°Ch=40.7W/m2Kd=0.025m Solution: Since the diameter of the fin…

Q: A plane wall has a thermal conductivity of 1.15 W/mK. If the inner surface is at 1100°C and the…

A: As per given question Thermal conductivity =1.15 w/mk Inner surfaces temp. =1100°c Outer temp.=350

Q: Determine the rate of heat transfer and the overall heat transfer coefficient for the composite wall…

A: Given Data The initial temperature is:T∞1=100°C The initial heat transfer coefficient is:h1=6…

Q: wall having a thermal conductivity of vity 0.9 W/mK. If the heat rate is to b

A: given:thermal conductivity of composite structural k=0.3W/mKthickness t=100mmhermal conductivity of…

Q: e heat transfer coefficient remains constant ne of the above e heat transfer coefficient will…

Q: O heat source 1나0°C Given: composite wall (3 layers) poy unethane board Corerete rock wool (15 cm,…

A: given data- rate of heat transfer = 507.415 W/m2 concrete temperature = 32 degree C tconcrete= 15 cm…

Q: A bare fuel rod has a diameter of 0.373 in and length of 12 ft. The volumetric heat generation rate…

A: Given data: d=0.373 inq'''=10000kW/ft3=34121420 Btu/hrPwater=2250 psiaT∞=575 FTs=675 F To find: Heat…

Q: Q3. A small electric heating application uses wire of 2 mm diameter with 0.8 mm thick insulation (k…

A: Given, r1=1 mmr2=1.8 mmk=0.15 W/m°Ch∘=31 W/m2°C

Q: Q3. A small electric heating application uses wire of 2 mm diameter with 0.8 mm thick insulation (k…

A: Given Data Diameter of wire, d=2 mm Insulation thickness, t=0.8 mm K=0.15 W/mC h0=31 W/m2C Outer…

Q: Rich cows’ milk (4536 kg/h) at 4.4°C is being heated in a heat exchanger to 54.4°C by hot water. How…

Q: The heat transmission rate through a plate is Ptrans. If the plate thickness is multiplied by two,…

A: The principle of thermal science expresses the rate of heat transmission through a solid called…

Q: U.2 W(III. K) IS auutu to 0.UZ II dlalIcter pipe. TIHE ZAJMIsulating Iaterial wiuI K heat transfer…

A: 1 2

Q: The 5-mm-thick bottom of a 200-mm-diameter pan may be made from aluminum (k = 240 W/m-K) or copper…

Q: 3- Compare the value between the the actual heat transfer rate Qactual for the surface with fins and…

A: “Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: A room window measure (3 m²) constructed of glass with overall heat transfer coefficient of (4 W/m?.…

Q: The 10-mm-thick bottom of a 200-mm-diameter pan may be made from aluminum (k = 240 W/m-K) or copper…

Q: A heavy-water-cooled research reáctor is fueled with natural- Im metal rods 0.9 in. in diameter clad…

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

Design thickness of the wall to maintain steady heat flux ??

A plane wall has a thermal conductivity of
1.15W/mK. If the inner surface is at 1100 degree
C and the outer surface is at 350 degree C, heat
flux of 2500 W/m2

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

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

1.19 A cryogenic fluid is stored in a 0.3-m-diameter spherical container is still air. If the convection heat transfer coefficient between the outer surface of the container and the air is 6.8 , the temperature of the air is 27°C, and the temperature of the surface of the sphere is –183°C, determine the rate of heat transfer by convection.
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.
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.
1.29 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.
Show that the rate of heat conduction per unit length through a long, hollow cylinder of inner radius ri and outer radius ro, made of a material whose thermal conductivity varies linearly with temperature, is given by qkL=TiTo(rori)/kmA where Ti = temperature at the inner surface To = temperature at the outer surface A=2(rori)/ln(ro/ri)km=ko[1+k(Ti+To)/2]L=lenthofcyclinder
The heat transfer coefficient between a surface and a liquid is 57 W/(m2K). How many watts per square meter will be transferred in this system if the temperature difference is 10C?
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.
3.16 A large, 2.54-cm.-thick copper plate is placed between two air streams. The heat transfer coefficient on one side is and on the other side is . If the temperature of both streams is suddenly changed from 38°C to 93°C, determine how long it takes for the copper plate to reach a temperature of 82°C.
A pipe carrying superheated steam in a basement at 10C has a surface temperature of 150C. Heat loss from the pipe occurs by radiation (=0.6) and natural convection (hc=25W/m2K). Determine the percentage of the total heat loss by these two mechanisms.
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
1.37 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 cooling system is to be designed for a food storage warehouse for keeping perishable foods cool prior to transportation to grocery stores. The warehouse has an effective surface area of 1860 m2 exposed to an ambient air temperature of 32C. The warehouse wall insulation (k=0.17W/(mK)) is 7.5 cm thick. Determine the rate at which heat must be removed (W) from the warehouse to maintain the food at 4C.