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!
Please include a free body diagram and assumptions
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.
Question: a) We want to increase heat transfer by placing fans to provide forced convection to reduce the length of the pipe necessary (Note that the outside surface temperature of the pipe remains the same at 100oC). What is the rate of heat transfer from pipe to the air per meter length if the air speed over the pipe surface is 5m/s? What is the total length of the pipe necessary? Problem: Consider a rectangular warehouse with the dimensions of 40m long x 20m widex10m height. The overall heat transfer coefficient for all sidewalls is Uwall=0.3 W/m2K (Approx. R=20 hr.ft2.oF/Btu) and for the flat roof, it is Uroof= 0.20W/m2K. The floor can be assumed to be insulated and we can ignore the heat transfer through the doors, etc. We want to maintain the inside air temperature at 15oC while the outside temperature is 0oC by using a thin-walled, 5.0cm diameter copper pipe that carries steam. Steam enters the pipe as saturated vapor at 100oC. So, as it starts losing heat to the inside air, it…
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)?
7. A composite wall consists of three materials, as shown in Figure 2. The inside wall temperature is 200°C and the outside air temperature is 50°C with a convection coefficient of 10 W/m²-K. Determine the temperature along the composite wall. Where A is the area of cross- section (can be taken to be equal to 1) and k is the conductivity. Problem is governed by the equation d²T -kA- = 0, 0

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