Consider a machine surface that is made of a 5-mm thick alu- minum with a thermal conductivity of 237 W/m-K. During operation the machine dissipates about 300 W/m² of heat to the surroundings, and the imer aluminum surface is at 150°C. To prevent machine operators from thermal burns, the machine surface can be covered with insulation. The aluminum/ insulation interface has a thermal contact conductance of 3000 W/m² K. What is the thickness required for the insulation Iayer with a thermal conductivity of 0.06 W/m-K in order tlo maintain the surface temperature at 45 C or lower? Inulation Aluminum machine surface 1:237 W/m K

Consider a machine surface that is made of a 5-mm thick alu- minum with a thermal conductivity of 237 W/m-K. During operation the machine dissipates about 300 W/m² of heat to the surroundings, and the imer aluminum surface is at 150°C. To prevent machine operators from thermal burns, the machine surface can be covered with insulation. The aluminum/ insulation interface has a thermal contact conductance of 3000 W/m² K. What is the thickness required for the insulation Iayer with a thermal conductivity of 0.06 W/m-K in order tlo maintain the surface temperature at 45 C or lower? Inulation Aluminum machine surface 1:237 W/m K

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 1.69 m wide by 1.06 m high metal plate must be insulated to prevent contact burn injuries. If the…

Q: two 5 cm diameter, 15 cm long aluminum bars (k=176W/m(degrees Celsius)) with ground surfaces are…

Q: A heat conducting rod, 0.30 m long, is made of an aluminum section that is 0.10 m long, and a copper…

A: A heat conducting rod, 0.30 m long, is made of an aluminum section that is 0.10 m long, and a copper…

Q: Mr. Bane is observing a protrude fin with a thickness of 0.0295 inches with a thermal conductivity…

Q: Pravinbhai

A: The objective of this question is to determine the temperature at the mid-plane of the Inconel…

Q: A spherical container holding a hot fluid at 500 K and having an outer diameter of 0.5 m is…

Q: An industrial cold room has four 200 mm thick walls made of concrete. The walls are insulated on the…

A: The objective of the question is to understand the relative temperatures of the internal and…

Q: There is a 1.20-cm-thick stagnant air pocket. A) What thickness of cork would have the same…

A: Given data, (1) Stagnate air pocket t1 = 1.2 cm K1 = 0.023 W/m.k Cork K2 = 0.046 W/m.k t2 =…

Q: An industrial cold room has four 200 mm thick walls made of concrete. The walls are insulated on the…

A: The objective of the question is to understand the heat transfer through the composite wall of a…

Q: Consider a 0.6 m X 0.6 m epoxy laminate (k = 0.2 W/m-k) whose thickness is 5 mm. In order to reduce…

A: Solution: Given Data: ke=0.2 W/m-Kt=5 mmkc=380 W/m-K∆T=20oCs=6 mmd=2 mm To Find: (a) Thermal…

Q: An industrial cold room has four 200 mm thick walls made of concrete. The walls are insulated on the…

A: The objective of the question is to determine the heat energy gained per hour through all 4 walls of…

Q: A pile of biomass (1.6 m deep, with a thermal conductivity of 0.41 W/mK) has been semi-buried in the…

A: Given : t = 1.6 m h = 13 W/m2K T = 23 C s = 15 W/m3 To find : Temperature at top surface at steady…

Q: A pipe having an outside diameter of 6 cm is maintained at 200°C by steam flowing inside. The pipe…

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

A: a) The thermal resistance diagram is given below- T1 = Inside temperature of the wallT2 =Temperature…

Q: Two large stainless steel plates at temperatures of 90°C and 70°C are separated by a stainless steel…

A: The diameter of the pipe is d=2.5 cm. The length of the pipe is L=0.3 m The thermal conductivity of…

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

Consider a machine surface that is made of a 5-mm thick alu-
minum with a thermal conductivity of 237 W/m-K. During
operation the machine dissipates about 300 W/m² of heat to the
surroundings, and the imer aluminum surface is at 150°C, To
prevent machine operators from thermal burns, the machine
surface can be covered with insulation. The aluminum/
insulation interface has a thermal contact conductance of
3000 W/m² K. What is the thickness required for the insulation
layer with a thermal conductivity of 0,06 W/m-K in order tlo
maintain the surface temperature at 45 C or lower?
Insulation
Aluminum machine surface
1:237 W/m K
50 C

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 3

VIEW

Step by step

Solved in 3 steps with 3 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

Two parts and label (A) & (B) Solve carefully! Question : The roof of a car in a parking lot absorbs a solar radiant flux of 600 W/m2, while the underside is perfectly insulated. The convection coefficient between the roof and the ambient air is 15 W/m2.K and the roof’s surface emissivity is 0.5. If the ambient air temperature is 25C, answer the following questions: PART (A) Neglecting radiation heat transfer, find the temperature of the roof under steady state conditions. Part ( B) Neglecting convective heat transfer, find the steady state temperature of the roof [Tsur =0]?
Not sure what I did wrong
There is a 1.20-cm-thick stagnant air pocket. A) What thickness of cork would have the same R-factor as the stagnant air pocket? The thermal conductivity of air is 0.0230 W/m·K and of cork is 0.0460 W/m·K.in cm B) What thickness of tin would be required for the same R-factor as a 1.20-cm-thick stagnant air pocket? The thermal conductivity of air is 0.0230 W/m·K and of tin is 66.8 W/m·K . in m i asked how to do this but got the wrong soloution
A dormitory at a large university, built 50 years ago, has exterior walls constructed of L, = 25-mm-thick sheathing with a thermal conductivity of ks = 0.1 W/m-K. To reduce heat losses in the winter, the university decides to encapsulate the entire dormitory by applying an L = 25-mm-thick layer of extruded insulation characterized by k; = 0.029 W/mK to the exterior of the original sheathing. The extruded insulation is, in turn, covered with an Lg = 5-mm-thick architectural glass with kg = 1.4 W/m-K. Determine the heat flux through the original and retrofitted walls when the interior and exterior air temperatures are Too₁ = 22°C and T∞,0 = -20°C, respectively. The inner and outer convection heat transfer coefficients are h; = 5 W/m²-K and h, = 25 W/m²-K, respectively. The heat flux through the original walls is i The heat flux through the retrofitted walls is i W/m². W/m².
A furnace of 0.3m by 0.3m by 0.6m inside dimensions is constructed of a material having a thermal conductivity of 0.894 W/m.K. The wall thickness is 10cm. The inner and outer surface temperatures are 600 degree Celcius and 100 degree Celcius respectively. Calculate the heat loss through the furnace wall by using (i) Conduction shape factor. (ii) Thermal resistance.
An industrial cold room has four 200 mm thick walls made of concrete. The walls are insulated on the outside with a layer of foam 60 mm thick. Cladding with a thickness of 15 mm protects the foam on the outside from the elements. The composite wall surface temperatures are –3 °C on the inside and 18 °C on the outside of the room respectively. The thermal conductivities of concrete, foam and cladding are 0.75, 0.35 and 0.5 W/m K respectively. Assuming perfect thermal contact between the layers of the composite walls, draw the typical temperature distribution across the layers and determine the heat energy gained per hour through all 4 walls of the room with a total surface area of 20 m2. What does this heat energy represent in terms of the refrigeration system of the cold room?