Heat Loss with a Trial-and-Error Solution. The exhaust duct from a heater has aninside diameter of 114.3 mm with ceramic walls 6.4 mm thick. The averagek 1.52 W/m K. Outside this wall,installed. The thermal conductivity of the rock wool is k = 0.046 + 1.56 x 10 T°C(W/m K). The inside surface temperature of the ceramic is Ti 588.7 K, and theoutside surface temperature of the insulation is T 311 K. Calculate the heat lossfor 1.5 m of duct and the interface temperature T2 between the ceramic and the insu-lation. [Hint: The correct value of km for the insulation is that evaluated at the meantemperature of (T2+ T3)/2. Hence, for the first trial assume a mean temperature of,say, 448 K. Then, calculate the heat loss and T2. Using this new T2, calculate a newmean temperature and proceed as before.]an insulation of rock wool 102 mm thick isdsMIsenitysMWTOBTHMAAhOSSUTDclveT alJolyslsbihesnigne lsaibemolaSOC199T01ad di199nigne loime. dheGA9120x

From the mean temperature calculate the thermal conductivity of the rock wool insulation.

Answered: Heat Loss with a Trial-and-Error…

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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The front window of an automobile has a thickness of 4 mm and is defrosted by the passage of a stream of hot air through the inner surface. The thermal conductivity of glass is around 0.78 W/(m oC). Assume the ambient air temperature is -10°C and the external convection coefficient is 65W/(m2 K). If the hot air blowing to defog the glass internally is at 40 ºC and the internal convection coefficient corresponds to 30 W/(m2 K), the internal surface temperatures will be _____________. However, if the car accelerates and maintains high speed, the external convection coefficient should _____________ [increase or decrease?] and if the condition is maintained long enough the temperature of the inner surface of the glass should _____________ [increase or decrease?].
i need the answer quickly
A thick-walled tube of stainless steel (L = 0.50 m; k = 21.63 W/m-K) with an inside diameter of 0.0254 m and outside diameter of 0.0508 m, is covered with an insulation (∆x =0.0254 m) with k = 0.2423 W/m-K. If the inside wall temperature of the pipe is at 400 oC, calculate the temperature at the interface between the metal and the insulation (in oC) if the outside surface of the insulation is at 29.8 oC. 99 K in Pa.
Please fats. The answer in the box is incorrect
You are designing a 3m x 3m floor with radiant heating. The floor has 12 parallel pex pipes (k = 40 W/mK) of L = 3m, OD = 25mm and ID = 20mm. Hot water (TInfintiy 1 = 90oC, h = 200 W/m2K) runs through the pipes continuously. The surface below the pipes is perfectly insulated. Above the pipes, there is a 3mm layer of bonding material (? = 12 W/mK) and a 9mm layer of tile (k = 2 W/mK). Above the tile, there is air (TInfinity 2 = 25oC, h = 20 W/m2K). Properties of Air: k = 0.025 W/mK, Pr = 0.72, v = 1.847 x 10−5, u = 16.84 x 10−6, p = 1.2 kg/m3, B = 1/Tf (ideal gas), Hint: Assume that the “layer” of pipe starts at the center point (e.g. for conduction purposes, the pipe is OD divided by 2 thick). For convection, consider the entire pipe surface. a) What is the total heat rate entering the room above the floor? b) What is the temperature of the top of the tile?
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.
Calculate the heat loss through a 100-ft² wall with an inside temperature of 65°F and an outside temperature of 35°F. Assume the exterior wall is composed of 2- in. of material having a 'k' factor of 0.80, and 2-in. of insulation having a conductance of 0.16. RTotal = 8.75 & Q = 342-Btu/hr RTotal = 9.2 & Q = 399-Btu/hr RTotal = 8.75 & Q = 399-Btu/hr RTotal = 9.2 & Q = 342-Btu/hr Hide hint for Question 3 Utilize the (RTotal = 1/C + x1/k1) equation.
1 - A square chip, with side w = 5 mm, operates under isothermal conditions.The chip is positioned on a substrate so that its side and bottom surfaces are thermally insulated, while its top surface is exposed to theflow of a refrigerant at T∞ = 15°C. From reliability considerations, the chip temperature cannot exceed T = 85°C. The refrigerant being air, with a convection heat transfer coefficientcorresponding h = 200 W/(m2K), what is the maximum allowable power for the chip? Since the coolant is a dielectric liquid for which h = 3000 W/(m²K), what is the maximum allowed power?
Hint: You found out where is the maximum temperature.
qo =4x107 W/m3 heat is produced in a spherical shaped radioactive material with a diameter of R = 0.2 m. The heat produced is released from the spherical surface to the environment in a stable regime. Thus, the temperature on the surface is kept constant at T=80°C The heat transmission coefficient of the object is given as k = 15W / m ° C. The temperature of the spherical body changes only in the radial direction. (T = T (r)). The distribution of temperature in a spherical body: =0 It is defined in the form. T, a) Obtain the temperature distribution T (r). b) Determine the boundary conditions. Find the maximum temperature. (Tmax)
I JUST NEED HELP WITH THE RED MARKED AREAS, THANKS!

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