31. The rate of heat conduction out of a window on a winterday is rapid enough to chill the air next to it. To see justhow rapidly the windows transfer heat by conduction,calculate the rate of conduction in watts through a3.00-m? window that is 0.635 cm thick (1/4 in) if thetemperatures of the inner and outer surfaces are 5.00°Cand –10.0°C, respectively. This rapid rate will not bemaintained-the inner surface will cool, and even resultin frost formation.

Answered: Image /qna-images/answer/2cce2f8a-5851-4013-9881-17b3f07f06fd.jpg

Answered: 31. The rate of heat conduction out of…

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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An asphalt playground is heated in the sun all day; by sundown it reaches a temperature of 45degC. If the asphalt has an emissivity of 0.8, what is the heat flux emitted off the asphalt at night?
11. A block of steel is uniformly heated from inside to maintain its temperature at 100 C. The block is a rectangular parallelepiped. The base of the block is a 3 cm by 3 cm square and the height of the block is 6 cm. We place this block in air at 25 C. Find the rate of heat loss from this block by natural convection. COn 11
7. A 3-m-internal-diameter spherical tank made of 1-cm thick stainless steel is used to store iced water at 0°C. The tank is located outdoors at 25°C. Assuming the entire steel tank to be at 0°C and thus the thermal resistance of the tank to be negligible, determine a) the rate of heat transfer to the iced water in the tank b) the amount of ice at 0°C that melts during a 24-hour period. The heat of fusion of water at atmospheric pressure is 333.7 kJ/kg. The emissivity of the outer surface of the tank is 0.6, and the convection heat transfer coefficient on the outer surface can be taken to be 30 W/m? · °C. Assume the average surrounding surface temperature for radiation exchange to be 15°C.
During hot summer weather, many people put “koozies” around their beverages to keep the drinks cold. In addition to preventing a warm hand from heating the container through conduction, what other mechanisms slow the process of warming beverages?
I need complete solutions and 4 decimal places in all solutions.
2 (a) The inner and outer surfaces of a 5m x 10m brick wall of thickness 30 cm and thermal conductivity 0.69 W/m·K are maintained at temperatures of 20°C and 5°C, respectively. (i) Determine the rate of heat transfer through the wall, in W. [Note: State all assumptions] (ii) Explain the effect of thermal conductivity in rate of heat transfer
Required information Consider a person whose exposed surface area is 21 m4, emissivity is 0.5, and surface temperature is 32°C. Given: 0 = 5.67×10-8 W/m2.K4 Determine the rate of heat loss from that person by radiation in a large room having walls at a temperature of 300 K (upto 3 decimal places). You must provide an answer before moving to the next part. The rate of heat loss from the person at 300K is W.
Number 4 A food product wants to be produced in a small round shape (pellet) by freezing it in a water blast freezer freezer. Air freezer operates at -25°C. The initial product temperature is 25°C. The pellet has a diameter of 1.2 cm, and a density of 980 kg/m³. The initial freezing temperature is -2.5°C. The latent heat of freezing of the product is 280 kJ/kg. The thermal conductivity of the frozen product is 1.9 W/(m °C). The convective heat transfer coefficient is 40 W/(m² K). Calculate the freeze time. tf = answer in hour
A wood stove is used to heat a single room. The stove is cylindrical in shape, with a diameter of 26 cm and a length of 52 cm, and operates at a temperature of 490°F. If the temperature of the room is 60°F, and if the emissivity is 0.844, then Calculate, the amount of radiant energy delivered to the room by the stove each second (KW) Answer
Consider heat loss through the two walls of a house on a winter night. The walls are identical, except that one of them has a tightly fit glass window. Through which wall will the house lose more heat? Explain.
(3) A thick steel slab is initially at a uniform temperature of 25°C. When the slab is exposed to hot flue gases, the surface temperature suddenly changes to 450°C. Make calculations for the temperature in a plane 250 mm from the slab surface 5 hours after the operation of change in surface temperature. Find also the heat flowing into 2 square meters of this plane and the total energy flowing through the surface during the 5 hour period. It may be presumed that for steel, thermal conductivity k = 160 kJ/m hr deg, density p = 8000 kg/m3 and the specific heat capacity Cp = 0.48 kJ/kg deg. Activate Windows Go to Settings to activate Win 1:36 7/13 P Type here to search 14117 detete home Snut ort sc 144 & backspace lock E R home enter D G pause esned 1 shift B N M en alt ctri
Activity 1. What are the mechanisms of heat transfer? How are they distinguished from each other?

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