The wall of a drying oven is constructed by sandwiching an insulation material of thermal conductivity k = 0.0705 W/m-K between thin metal sheets. The oven air is at the temperature, T₁ = 450°C, and the corresponding convection coefficient is h = 20 W/m²K. The inner wall surface absorbs a radiant flux of qrad 140 W/m² from hotter objects within the oven. The room air is at the temperature, To = 21°C, and the overall coefficient for convection and radiation from the outer surface is ho= 12 W/m²K. What insulation thickness, L, is required to maintain the outer wall surface temperature at Twall = 72°C? =

The wall of a drying oven is constructed by sandwiching an insulation material of thermal conductivity k = 0.0705 W/m-K between thin metal sheets. The oven air is at the temperature, T₁ = 450°C, and the corresponding convection coefficient is h = 20 W/m²K. The inner wall surface absorbs a radiant flux of qrad 140 W/m² from hotter objects within the oven. The room air is at the temperature, To = 21°C, and the overall coefficient for convection and radiation from the outer surface is ho= 12 W/m²K. What insulation thickness, L, is required to maintain the outer wall surface temperature at Twall = 72°C? =

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Related questions

Q: A surface is at 200°C and is exposed to surroundings at 60°C and convicts and radiates heat to the…

Q: Consider a short cylinder of 10.0cm diameter and 5.0cm length with a thermal conductivity of k = 10…

A: Diameter = 10 cm = 0.1 m Length = 5 cm = 0.05 m k = 20 W/m.K h = 20 W/m2K Rate of heat generation =…

Q: 40-W power transistor is to be cooled by attaching it to one of the commercially available heat…

Q: 5 A double glazed window of 1.5 m² surface consists of two layers of glass (k = 0.78 W m-¹ K-¹) each…

Q: 2. Compare the heat loss from insulated and uninsulated copper pipe (k-400 W/m K) under the…

A: Given:The thermal conductivity of the copper is The pipe internal diameter isThe pipe outside…

Q: A pipe 200 mm outside diameter and 20 m length is covered with a layer, 70 mm thick of insulation…

Q: To increase the rate of heat transfer from a device, which has 0.1 m² of exposed surface, you added…

Q: A 1.0 m × 1.5 m double glazed window consists of two 4 mm thick glass (k = 0.78 W / m K) layers…

Q: A spherical tank of 3.5-m diameter contains a liquified-petroleum gas at -60°C. Insulation with a…

Q: A pipe is carrying cold water. At a small section of the pipe it was found that the average water…

A: Given: T∞,i = 5oC hi = 20 w/m2k T∞,o = 30oC ho = 12 w/m2k k = 2 w/m.k r1 = 0.1 m t = 0.04 m

Q: A furnace wall is made of composite wall of total thickness 550 mm. The inside layer of wall is made…

A: Given, Thickness (T) = 550 mm Thermal Conductivity of inside layer(kA) = 1.5 W/m°C Thermal…

Q: A Thermopane window consists of two 3-mm-thick pane of glass separated by a stagnant air space of…

Q: The wall of a furnace is made up of a material which has thermal conductivity of 3.5 W/m◦C and a…

A: thermal conductivity of wallk=3.5W/m°Cthickness of wallL=400mm=0.4mInside temperature of…

Q: A cold storage compartment is 4.5 m long and 4 m wide by 2.5 m high. The four walls ceiling and…

Q: Consider a silicon wafer positioned in a furnace that is zone-heated on the top section and cooled…

A: To find: The value of steady-state temperature of the wafer, in K. Given data: Tsur,h = 1150 KTsur,c…

Q: The cylinder of an engine is I m long and has an outside diameter of 6 cm. The outside surface…

A: Given data as per question Length of cylinder =1 m Outside diameter =6cm Outer surface temperature…

Question

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: Write the given data with suitable variables-

VIEW

Step 2: Determine the value of insulation thickness.

VIEW

Solution

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 3 steps with 5 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

A black thermocouple is inside a chamber with black walls. If the air around the thermocouple is 20 oC, the walls are at 100 oC and the heat transfer coefficient between the thermocouple and the air is 75W/m2- K. What temperature will the thermocouple read?
A thin board of 0.5 cm thickness is exposed to a fluid of T, = 22°C and h = 30 W/m².K from one side with an emissivity of 0.7 where it faces a surrounding whose temperature is Tsur = 30°C. A heat flux of q" = 3500 W/m? is applied to the other side. Each side has an area of 12cm×12cm. Tsur (a) If the board has the following properties: k = 15.1 W/m.K, c, = 480 J/kg.K and p = 8055 kg/m², express an equation for the variation of temperature with respect to time. (b) Find the initial time rate of change of the board temperature if the initial board temperature is q" h 50°C.
= A processing plant is convectively heating a solid half-sphere of radius of 12 cm made of pure aluminum (k 237 W/m-K) by placing it on an insulated surface as shown in Fig. 1. It is exposed to hot exhaust gas at 300°C with a convection coefficient of 180 W/m².K. Is the lumped capacitance approximation valid? Figure 1: Half-sphere
A large window glass 0.5 cm thick (k= 0.78 W/m K) is exposed to warm air at 25oC, over its inner surface with convection coefficient of 15 W/m2K. The outside air is at 258 K with convection coefficient of 50 W/m2K. Determine the heat transfer rate and temperature at the inner and outer surface of the glass.
The thermal conductivity of a solid material can be determined using asetup similar to the one shown in the accompanying figure. The thermocouples are placed at 2.5 cm intervals in the known material (copper alloy, k - 52 w/m.k) and the unknown sample, as shown. The known material is heated on the top by a heating element, and the bottom surface of the sample is cooled by running water through the heat sink shown. Determine the thermal conductivity of the unknown sample for the set of data given in the accompanying table. Assume no heat loss to the surroundings and perfect thermal contact at the common interface of the sample and the copper.