Pls handwrite KNOWN: Diameter of electrical wire. Thickness and thermal conductivity of rubberized sheath.Contact resistance between sheath and wire. Convection coefficient and ambient air temperature.Maximum allowable sheath temperature.FIND: Maximum allowable power dissipation per unit length of wire. Critical radius of insulation.SCHEMATIC:WireEgen, D = 2 mmRtc 3x10-4 m²-K/WAirq'Tw,o Tin,iwwRt.c R'condTin,oΤοwww.R'convInsulation, t = 2 mmk = 0.13 W/m-KTmax = 50°CTap=20°Ch = 10 W/m²-KASSUMPTIONS: (1) Steady-state, (2) One-dimensional radial conduction through insulation, (3)Constant properties, (4) Negligible radiation exchange with surroundings.

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Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter9: Heat Transfer With Phase Change

Section: Chapter Questions

Problem 9.12P

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As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of calcium silicate. 12. Ts.2} 1, Ts,1} Steam Insulation = 490 K, respectively, (a) If the insulation is 27.5 mm thick and its inner and outer surfaces are maintained at T,1 what is the rate of heat loss per unit length (q) of the pipe, in W/m? = 800 K and T,2 (b) Determine the rate of heat loss per unit length (q'), in W/m, and outer surface temperature T,2, in K, for the steam pipe with the inner surface temperature fixed at T1 = 800 K, inner radius rį = 0.06 m, and outer radius ry = 0.12 m. The outer surface is exposed to an airflow (T, = 25°C) that maintains a convection coefficient of h = 25 W/m2-K and to large surroundings for which Tsur = T, = 25°C. The surface emissivity of calcium silicate is approximately 0.8. %3D
ha T. R h Ta = 40 W/m °C %3D pipe L=1 m; R, = 0.05m; R2 = 0.052m; Tin = 70°C; Tout = 20°C; hn = 30 W/m2 °C; hout = 20 W/m2 °C; K The total thermal resistance of insulated steam pipe, if a 0.03m thickness of fiberglass insulation (K fibergias = 0.04 W/m. °C) is added to pipe to save heat losses. 3°C/W Ob - 2°CW -1°C/W Od. No answer is correct
As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of calcium silicate. 12. Ts.2} 1, Ts,1} Steam Insulation 800 K and T,2 490 K, respectively, (a) If the insulation is 25 mm thick and its inner and outer surfaces are maintained at T,1 what is the rate of heat loss per unit length (d ) of the pipe, in W/m? (b) Determine the rate of heat loss per unit length (d'), in W/m, and outer surface temperature T,2, in K, for the steam pipe with the inner surface temperature fixed at T,1 = 800 K, inner radius rį = 0.06 m, and outer radius r2 = 0.16 m. The outer surface is exposed to an airflow (T, = 25°C) that maintains a convection coefficient of h = 25 W/m2-K and to large surroundings for which Tsur 25°C. The surface emissivity of calcium silicate is approximately 0.8.
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As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of calcium silicate. 1. Ts. 1} Steam 12. T8.2} Insulation (a) If the insulation is 27.5 mm thick and its inner and outer surfaces are maintained at T1 = 800 K and T2 = 490 K, respectively. what is the rate of heat loss per unit length (q') of the pipe, in W/m? (b) Determine the rate of heat loss per unit length (q'), in W/m, and outer surface temperature T2, in K, for the steam pipe with the inner surface temperature fixed at T₁ = 800 K, inner radius r₁ = 0.06 m, and outer radius r₂ = 0.14 m. The outer surface is exposed to an airflow (To = 25°C) that maintains a convection coefficient of h = 25 W/m²-K and to large surroundings for which Tsur = To = 25°C. The surface emissivity of calcium silicate is approximately 0.8.
A boiler furnace wall must have a heat loss no greater than 700 Btu/hr~ft2 and is madeof a material with a thermal conductivity of 0.60 Btu/hr~ft~F. The inner wall surfacetemperature is '2000°F, and the outer surface temperature is 800°F. What wall thick~ness is required?
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Requirements: 1. Fill the tables. 2. Calculate the thermal conductivity and the thermal resistance. Comment on results. 3. Plot the measured values for temperature difference over the electrical power. please don't reject the question. Thank you
An office space contains one (6`x 3`) well- fitted door made of nominal 2" wood. The heat loss through door by infiltration is (3381 Btuh) if Tb.l.=80 F , To= -10 F , and Vwind=15 mph ? True or false
c. Short answer You need to calculate the temperature at the free end (tip) of a long fin. The boundary condition you should NOT use is: Circle one! Convective tip Adiabatic tip Infinite fin d. Multiple choice For the most effective fin, should the fin material have: Circle one! (k is thermal conductivity, h is convection coefficient) 1. Large h, Large k 2. Large h, Small k 3. Small h, Large k 4. Small h, Small k
Consider a A = 17.0000 m² wall with two layers of insulation: d T = 10 °C between styrofoam and brick layers. Heat flow through d = 11 cm d = 15 cm Outside T = 1°C foam K = 0.01 W/(m Inside A 17.0 m² = 10 °C k=0.8W(mK) system of coordinates What is the heat flow through the wall divided by wall area? W What is the inside temperature? Tin = 9 Your last answer was interpreted as follows: 1 What is the heat flow (power) through the wall? P= W Your last answer was interpreted as follows: 1 What is the amount of heat passed through the wall? °C Your last answer was interpreted as follows: 1 Your last answer was interpreted as follows: 1 15 cm of brick wall and d = 11 cm of styrofoam. Temperature outside is Tout = 1 °C and the wall is measured for t = 12 h Do not leave any fields blank if you don't know the answer insert 1 for example

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