A spherical steel tank (k = 15 W/m.°C, thickness=1.5 cm) tank of inner diameter 3.83 m contains ice @ 0°C in a room at 20°C, the entire steel tank to be at 0°C.What is the radiation heat transfer %3D rate (W)? Air properties (k = 0.02439, W/m.°C, Pr = 0.7336, v = 1.426E-5 m /s) %3D Select one: A. 4493.18 B. 5182.0 C. 4818.4 D. 5532.2 E. 4093.0

A spherical steel tank (k = 15 W/m.°C, thickness=1.5 cm) tank of inner diameter 3.83 m contains ice @ 0°C in a room at 20°C, the entire steel tank to be at 0°C.What is the radiation heat transfer %3D rate (W)? Air properties (k = 0.02439, W/m.°C, Pr = 0.7336, v = 1.426E-5 m /s) %3D Select one: A. 4493.18 B. 5182.0 C. 4818.4 D. 5532.2 E. 4093.0

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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A spherical steel tank (k = 15 W/m.°C, thickness=1.5 cm) tank of inner diameter 3.83 m contains ice @ 0°C in a room at 20°C, the entire steel tank to be at %3D 0°C.What is the convection heat transfer rate (W)? Air properties (k = 0.02439, W/m.°C, Pr = 0.7336, v = 1.426E-5 m /s ) %3D Select one: A. 1911.1 В. 1419.1 C. 1673.5 D. 1149.6 E. 924.31
Hot Air blows over steel plate with dimension (5000mm * 7.5m)), the steel plate temperature is 22'C, the convection heat-transfer coefficient is h= {25 W/m2- C}. Calculate the heat transfer? if you know that thermometer reader read air temperature is 492 K
ure f) A steel disc (k = 56.7 W/m.K, p = 7854 kg/m³, c = 487 J/kg. K) 30 cm in diameter and 10 cm thick, initially at uniform temperature of 265 °C is immersed in liquid at -15 °C. The convective coefficients on ends and on cylindrical side are 340 and 1420 W/m².K, respectively. What is the temperature at (a) center of disc, and (b) surface at centre of one end (c) Calculate heat transfer after 5 min have elapsed.
An egg with mean diameter of 40 mm and initially at 20 °C is placed in a boiling water for (4min) and found to be boiled to consumers taste. For how long should a similar egg for same consumer be boiled when taken from a refrigerator at 5 °C. Take the following properties for egg: k = 10 Wim. °C and the heat transfer coefficient (h = 100 W/m. "C) .p= 1200 kJ / kg. "C, C = 2 kJ/ kg. "C,
A spherical steel tank (k = 15 W/m.°C, thickness=1.5 cm) tank of inner diameter 2.66 m contains ice @ 0°C in a room at 20°C, the entire steel tank to be at 0°C.What is the convection heat transfer rate (W)? Air properties (k = 0.02439 W/m,C, Pr = 0.7336, v = 1.426E-5 m/s) %D Select one: A. 637.1 B. 1129.1 C. 142.31 D. 891.5 E. 367.6
A:Find the amount of heat transferred through an iron fin of thickness 5 mm, length 10 cm and width 100 cm. Also determine the temperature difference e at the tip of the fin at: 1- adiabatic tip, 2-heat convection at the tip. Assuming the atmospheric temperature of 28°C K=50 w/mK, h=10 w/m’K, O,=80°C. B-Why is the dimensional heat flow assumption important in the analysis of fins problems? C- Why are the annular fins more efficiency than others?.
Q2/ An aluminum sphere weighting 7kg and initially at a temperature of 533K is suddenly immersed in a fluid at 283K. if heat transfer coefficient between the sphere and fluid is 50W/m?.°C. Take density=2707kg/m3, specific heat=0.9KJ/kg.°C and thermal conductivity= 204W/m °C. إجابت * Determine the Bi number 0.00696 0.000696 0.0052 0.00052 0 أخری *.Determine the time required to cool sphere to 263K 26.28min 262.8min 52.56 min 525.6 min O أخری
A spherical steel tank (k = 15 W/m.°C, thickness=1.5 cm) tank of inner diameter 3.85 m contains ice @ 0°C in a room at 20°C, the entire steel tank to be at 0°C.Wliat is the convection beat transfer rate (W)? Air properties (k= 0.02439 W/m."C, Pr=0.7336, v 1.426E-5 m /s) %3D Select one O A 1434.3 OB 1688.6 OC 1926.3 OD. 939.46 OE 1164.8
Read the question carefully and give me right solution according to the question. Note: Don't copy other expert solution. I have other website solution. A metallic ball of radius ro = 5 mm, is initially in equilibrium at 400 C in a furnace. It is suddenly dropped to water at 20 C hw 10814 W/m2 K, . The properties of the sphere are density= 3000 kg/m3, k = 20 W/m_ K, c = 1000 J/kg K, and α= 6.66E-6 m2/s. Calculate the time required for the center of the sphere to cool to 50 C.
Q3: In iron whose base plaet is mad aluminum alloy is turn on : The time for the plate temperature to reach 140°C. Determine the plate temperature which is to be uniform at all times . Take for the aluminum p=2770 kg/m, C,-875 kJ/kg."C , a=7.3 m/s. The thermal conductivity of the plate k=177 W/m."C Air 22°C Ans : 51.8 °C IRON 1000 W ttt t t
Brass cube "p = 8530 kg/m , c_= 380 J/kg.°C, k= 110 W/m.°C, a = 33.9E-6 W/m.°C", side length =9 mm, are annealed by heating them first to 929°C in a furnace and then allowing them to cool slowly to 130°C in ambient air at 28°C. If the average heat transfer coefficient is 17.3 W/m .°C, how long will the annealing process will (seconds)?
Example 3.3: The temperature at the center of a tender-boiled potato needs to be 98.9°C. Let's take a potato with 4 cm diameter at 5°C and and put it in vigorously boiling water at 100 °C, where convection coefficient is 1200 W/m². c. How much time will it take to cook the potato? Potato properties: density p=1070 kg/m³, conductivity k=0.8 W/m.°c, specific heat c = 3400 J/kg-°C.