13.75 Coated metallic disks are cured by placing them at the top of a cylindrical furnace whose bottom surface iselectrically heated and whose sidewall may be approximated as a reradiating surface. Curing is accomplished bymaintaining a disk at T, = 400 K for an extended period. The electrically heated surface is maintained at T, = 800 K and ismounted on a ceramic base material of thermal conductivity k = 20 W/m · K. The bottom of the base material, as well asthe ambient air and large surroundings above the disk, are maintained at a temperature of 300 K. Emissivities of the heaterand the disk inner and outer surfaces are ɛ, = 0.9, E2 j= 0.5, and ɛ2 o = 0.9, respectively.sur= 300 KT, h-T2, E2.i E2,0L. = 200 mm-T1, Ɛ1L, = 25 mmk, = 20 W/m •KD =-T, = 300 K+120 mm-►|Assuming steady-state operation and neglecting convection within the cylindrical cavity, determine the electrical powerthat must be supplied to the heater and the convection coefficient h that must be maintained at the outer surface of the diskin order to satisfy the prescribed conditions.11

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Answered: 13.75 disks are cured by placing them…

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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Example 29.10. (S.I. Units). 4 25 om nteam main, 225 matres long is covered with 5 orm of high temperature insrulation (K=0'095 W/m°K) and 4 om of low temperature inmudation (K-6-085 W/m K). The inner and outer surface temperaturen as measured are 400°C and 50°0 svapselively. Conspute : (a) the lotal hoat loss per hour (b) the total hent loes per aq. m. of outer eurface (c) the heat loss per aq. m. of pipe aurfuce (d) the temperalure between the two layere of inoulation. Negled hent conduetion through pipe material.
10.6 Suggestions for Discussion (i) Is it important to consider heat losses from the insulation? (ii) (iii) What errors may be introduced by measuring heat transfer coefficient by this What effect does the heat loss have on the value of heat transfer coefficient? method? Carry out the sensitivity analysis of heat transfer coefficient in terms of important variables that you have measured during this experiment. What would you recommend to improve the reliability of this experiment? (iv) (v)
Two water columns are at different temperatures, one being at 35°C and the other being at 18oC. The water columns are separated by a glass wall of area Im by 2m and a thickness of 0.005m. Calculate the amount of heat transfer. (Thermal Conductivity of glass is 1.6 W/mK) TABLE 13-13 Typical values of resistance for common building materials R, m K/W R for thickness shown, m K/W Building material Building board Eypsum, 9.5 mm particle board Building membrane 2 layers, 0.73 kg/ns³ felt 0.056 7.35 0.21 Glass single glazing. 3 mm double glazing. 6 mm air space triple glazing, 6 mm air space 0.16 0.32 0.47 Insulating material Blanket and batt mineral fiber from glass, approx. 90 mm approx. 150 mm approx. 230 mm approx. 275 mm glass fiber, organic bonded loose fill milled paper spray applied polyurethane foam Roofing 2.29 3.32 5.34 6.77 27.7 23 40 asphalt shingles buil-up, 10 mm 0.077 0.058 Masonry brick 1.15 concrete 0.6 Siding materials hardboard, 1l mm 0.12 plywood, 9.5 mm Aluminum or…
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…
silicon carbide (T ≈ 300 K): k = 490 W/m⋅K
show a detailed solution to the problem. the solution is correct (use to double check)
"You did calculations using the simplified HAZ time-temperature formulas, assuming 3D heat flow, and are presenting your final internship conclusions to management. You realize with horror, in the middle of your presentation, that you forgot to label your calculated curves (below). Which curve is which? Pick the best answer A: "Plot 1 is HYPERFILL® and Plot 2 is p-GMAW. Since HYPERFILL® has the higher heat input, it cools more slowly." B: "Plot 2 is HYPERFILL® and Plot 1 is p-GMAW. Since HYPERFILL® has the faster travel speed of the two processes, it cools faster." C: "Plot 1 is p-GMAW and Plot 2 is HYPERFILL®. Since p-GMAW has the slower travel speed, it cools more slowly." D: "Plot 2 is p-GMAW and Plot 1 is HYPERFILL®. Since p-GMAW has the lower heat input, it cools faster" Both (A) and (D)

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