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.3a. Draw the thermal resistance circuit of the system3b. Derive the energy balance of the system3c. Find the thermo-physical properties of the air and aluminiumAluminium 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

Composites pipes are used in electrical insulations. Fiber-reinforced plastics (FRP),…

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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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!
Show the thermal circuit by labeling all the thermal resistances. Calculate and tabulate the thermal resistances (assume Tavg=470 K for the air gaps). If q''rad= 0.25W/cm^2, what is the outer surface temperature of turnout coat for inner temperature of 66C.
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!
Please include a free body diagram and assumptions
QUESTION 3: A 0.5 m x 2.5 m double-pane window consists of two 4.5-mm-thick layers of glass (k = 0.75 W/m·K) that are separated by a 2.5 mm air gap (kair = 0.025 W/m·K). The heat flow through the air gap is assumed to be by conduction. The inside and outside air temperatures are 20°C and - 1°C, respectively, and the inside and outside heat transfer coefficients are 32 and 12W/m2·K. 3.1) Draw a representation of the setup with the thermal resistance network 3.2) Determine the daily rate of heat loss through the window in steady operation. 3.3) Calculate the temperature difference across the largest thermal resistance.
Question 11 Not yet answered Marked out of 2.50 P Flag question A cylindrical resistor element on a circuit board dissipates 0.23 W of power in an environment at 28°C. The resistor is 1.3 cm long, and has a diameter of 3 mm. Assuming heat to be transferred uniformly from all surfaces. What is the surface temperature of the resistor for a combined convection and radiation heat transfer coefficient of 13 W/m .°C? Select one: A. 157.46 B. 190.22 C. 168.73 D. 130.79 E. 143.48
show a detailed solution to the problem. the solution is correct (use to double check)
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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A hexagonal cylinder of solid copper has a flat ceiling and a flat floor. Assume the ceiling is at temperature T₁ and the floor is at T₂ < T₁. The other four sides of the hexagon are perfectly insulated with organic, free-range, grass-fed goose down. Sketch and label several isotherms and adiabats within the copper.
After you exercise for a while, you may notice that your skin turns red. (A) How is the blood flow in your limb changes as a response to the exercise? When your skin turns red, how has the temperature changed at the skin surface (Tskin)? (B) During exercise, does the total heat generation rate inside your body increase or decrease from that in normal conditions? (C) What is the relationship between the total heat generation rate and the total heat loss from the skin surface to the environment by convection? Neglect sweating and radiation. (D) The total heat loss from the skin surface to the environment is hA(Tskir-Tair). Based on this convection equation and results in (C), how has the skin temperature changed during exercise? Does Tskin increase or decrease from that in normal conditions? Is this consistent with that in (A)?

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