A 25 cm thick brick wall of 4 m by 3 m and thermal conductivity 0.5 W/m. C has inner and outer surfaces at 15 C and 7 C, respectively. Furthermore, the inside air has a temperature of 0 C and a convective heat transfer coefficient of 4.5 W/m^2. C. The rate of heat transfer between the wall and the air is: Select one: a. 684 W b. 828 W c. 475 W d. 810 W

A 25 cm thick brick wall of 4 m by 3 m and thermal conductivity 0.5 W/m. C has inner and outer surfaces at 15 C and 7 C, respectively. Furthermore, the inside air has a temperature of 0 C and a convective heat transfer coefficient of 4.5 W/m^2. C. The rate of heat transfer between the wall and the air is: Select one: a. 684 W b. 828 W c. 475 W d. 810 W

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

See similar textbooks

Similar questions

A plate-shaped glass wall with a thickness of 3 cm and a heat transfer coefficient of 2W / m.K has 30C air on the inside and 10C ambient air on the outside. The internal and external convulsion coefficients are 30 W / m ^ 2.K and Since it is 15W / m ^ 2.K,a.) The amount of heat in the unit area of the wall,b.) Calculate the inner and outer surface temperatures of the wall.
A wall of length "L" m and height "H" m is made from a thick bricklayer of 29 cm with thermal conductivity of 0.5 W/mK is subjected to heat transfer due to the outside temperature as 43 oC and inside temperature 28 oC. If the energy loss is 11427 kJ in 9 hours. Determine the Heat transfer rate, Surface Area and Length and Height of the wall, if L = 1.5 H. Solution: i) Heat Transfer Rate (in Joule/Sec) = ii) Surface Area of the Wall (in m2) = iii) Height of the Wall (H in m) = iv) Length of the Wall (L in m) =
A hot fluid (60° C) flows inside an copper tube with 1.7 cm OD and 1.5 cm ID. The inside of the pipe has a heat transfer coefficient of 130 W/m2-K. The tube is exposed to a room with air and surrounding walls of 23° C. The heat transfer coefficent between the outside of the walls and the room air is 15 W/m2 K. Draw an equivalent circuit diagram of the heat transfer, and quantify the resistance to heat flow by each of the two convective processes, conduction in the tube, and radiation between the outside of the tube and the room walls. Are any of the resistances negligible to the overall heat transfer, and if so, which ones?
Heat transfer
Please solve this question in thermodynamics
1- A cylindrical system compose of two layers carrying hot fluid of 100 °C temperature and 200W/m2.°C heat transfer coefficient. The system exposed to ambient of 20 °C temperature and 10 W/m².°C heat transfer coefficient. The inner layer is made of steel with 10 cm radius, 2cm thick and 50 W/m.°C thermal conductivity. The outer layer is made of fiber class with 5cm thick and 0.04 W/m.°C thermal conductivity. Find: a- The amount of heat transferred to the ambient per unit length of the system. b- The temperature between the two cylindrical layers.
A 25 cm thick brick wall of 4 m by 3 m has inner and outer surfaces at 15 C and 7 C, respectively. What is the value of the conductivity if the heat rate by conduction is equal to 2300 W. Select one: a. 5.99 W/m. C b. 4.71 W/m. C c. 3.84 W/m. C d. 6.9 W/m. C
The inner and outer surfaces of a 1-m by 1-m wall of thickness 100 mm and thermal conductivity 10 W/m. C are maintained at temperatures of 35 C and 15 C, respectively. Determine the heat rate by conduction. Select one: a. 2 kW b. 2 MW c. 20000 W
Q) The temperature of a heated plate is 88°C which is cooled by using pin-fins having a length of 5-cm, diameter of 1-cm, and thermal conductivity of (k=201 W/m-°C). The number of pins is (N=1800) and the temperature of the atmosphere is 10°C, while the convection heat transfer coefficient on the surfaces is 37 W/m2.°C. Assuming steady one-dimensional heat transfer along the fin and taking the nodal spacing to be 2.5-cm, determine (a) the temperature at the nodes along the fins, (b) the heat transfer rate from a single fin, (c) the heat transfer rate from all fins, and (d) the overall heat transfer rate from the heated plate which has dimensions of 0.6-m x 0.5-m with the fins.