Question 3: An electronic device with a temperature of 84°C (shown in golden colour) isembedded inside a composite plastic tube which is equipped with three fins (shown in blue)to enhance the convective heat transfer with the surrounding air. The composite tube is heldhorizontally. The temperature drop along the fins can be ignored due to their high thermalconductivity. The outer ring of the fins (shown in brown) is insulated. The ambienttemperature is 20°C.3d. Calculate the heat transfer coefficients across the cylinder3e. Calculate the heat transfer coefficients across the fins by assuming fins as verticalplanes31. Calculate the heat loss across the systemAluminium finsDiameter = 30 cmInsulated ringThickness = 5 mmComposite tubeThickness = 5 mmThermal conductivity = 25 W/mkTube is held horizontally.Air20°CHot electronic deviceTemperature = 84°CDiameter = 10 cmLength = 100 cm%3D

It is asked to find the heat transfer coefficient over the horizontal tub as well as the vertical…

Answered: Question 3: An electronic device with a…

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

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Sepleniber 02 Heat is generated in a homogeneous spherical piece of radioactive material (2D - 8 cm) at rate of 71.8 MW/m and is dissipated to the environment. The center and surface temperatures of the spheres are (491°C and 80°C) respectively, What is the thermal conductivity of the radioactive material "W/m.K"?
Required information A masonry cavity wall consists of 100-mm common bricks, 90-mm air space, 100-mm concrete blocks made of lightweight aggregate, 20-mm air space, and 13-mm gypsum wallboard separated from the concrete block by 20-mm-thick (1 in x 3 in nominal) vertical furring whose center-to-center distance is 400 mm. One side of both air spaces is coated with a reflective film of = 0.05. The temperature difference across the air spaces can be taken to be 16.7°C with a mean air temperature of 10°C. The air space constitutes 81 percent of the heat transmission area, while the vertical furring and similar structures constitute 19 percent. The R-values for different materials are given in the table below. Construction 1. Outside surface, 24 km/h 2. Face brick, 100 mm 3. Air space, 90-mm, reflective with & = 0.05 4. Concrete block, lightweight, 100-mm 5a. Air space, 20 mm, reflective with & =0.05 5b. Vertical ferring, 20 mm thick 6. Gypsum wallboard, 13 7. Inside surface, still air…
Can someone please help me to solve all of the following question showing all work and explanation as well as graphs needed in excel with formulas. Thank you!
PROBLEM 4: A black thermocouple is inside a chamber with black walls. If the air around the thermocouple is at 20°C, the walls are at 100-C, and the heat transfer coefficient between the thermocouple and the air is 75 W/m²K, what temperature will the thermocouple read?
Question One Explain how heat is transferred from one point to another illustrating with appropriate diagram. Calculate the heat flow per square meter (heat flux) through water medium with thermal conductivity of 0.6, flowing in a 5 cm thickness space, if the temperatures on the two surfaces are 50 and 210°C, respectively. Question 2 Distinguish between force and free convection with the aid of appropriate illustrations. What is the approximate temperature difference between a hot plate and the surrounding air if the heat flux from the plate is 800 W/m2? Assume that the air is flowing past the surface with a velocity of 5 m/s giving a heat transfer coefficient of 20 W/(m2K). Question 3 Explain the differences between laminar and turbulent flow Water (ν = 0.86x10-6m2/s) flows through a tube with the diameter 12 mm at a velocity of 2 m/s. Determine if the flow is laminar or turbulent!
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2. A heater is a thin vertical panel 1.0m long and 0.7m high and is used in a warehouse to keep workers warm. The heater has air circulating on each side. Assume the maximum temperature of the panel is 60°C (already above the board line that is safe for human hands to touch briefly without getting hurt). Assume the room air temperature is 18°C but the warehouse wall temperature is 5°C. Model the surface with an emittance of 0.9 and Vair = 1.57x105 m²/s. a. Determine the maximum power rating for the heater. b. Now if you run the heat by standing on its side (it will be 1.0 m high and 0.7 m long), determine the surface temperature. c. Compare case a and b and explain any differences you see.
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