3-26 Consider a person standing in a room at 20°C with an exposed surface area of 1.7 m². The deep body temperature of the human body is 37°C, and the thermal conductivity of the human tissue near the skin is about 0.3 W/m - °C. The body is losing heat at a rate of 150 W by natural convection and radia- tion to the surroundings. Taking the body temperature 0.5 cm beneath the skin to be 37°C, determine the skin temperature of the person.

3-26 Consider a person standing in a room at 20°C with an exposed surface area of 1.7 m². The deep body temperature of the human body is 37°C, and the thermal conductivity of the human tissue near the skin is about 0.3 W/m - °C. The body is losing heat at a rate of 150 W by natural convection and radia- tion to the surroundings. Taking the body temperature 0.5 cm beneath the skin to be 37°C, determine the skin temperature of the person.

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

Q3) Consider a 1.2 m high and 2 m wide double pane window shown in Figure, consisting of two 3 mm thick of glass ( k 0.78 W/m."C) separated by a 12 mm wide stagnant air space (k = 0.026 W/m."C).Determine the steady rate of heat transfer through this double %3D pane window and the temperature of its inner surface for a day during which the room is maintained at 24 °C while the temperature of the outdoor is -5 "C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be hi Amm = 10 W/m2.C hz = 25 W/m2."C. Prae
Consider a furnace (as a plane wall) which has a thickness of 15 cm and a surface area of 1 m?. The inside surface of the furnace wall (the hot left side of the wall) is at temperature T1. The furnace wall is made of brick with thermal conductivity of 1.198 W/m.K. The outside surface of the furnace wall (the right side of the wall) has a surface emissivity of 0.8 and is maintained at T2=101 °C and subject to air at 25 °C with convection heat transfer coefficient of 20 W/m?.K. The surroundings temperature at the outside of the furnace wall is at 25 °C. Required: Draw a clear and consistent schematic of the problem and label the operating conditions on the schematic. Perform systematic analysis, state your assumptions and justify the equation used and determine the following (circle your final answers): (i) The rate of heat transfer by convection (in W); (ii) The rate of heat radiation (in W); (iii) The surface temperature of the furnace wall T1 (in °C); (iv) The rate of conduction heat…
700 W/m3 electrical heat is generated in a large plane wall whose one side is insulated while the other side is subjected to convection. The thermal conductivity of the wall is (k W/m.K) and the convection heat transfer coefficient is (h = 17 W/m?K). Determine the location and the value for the maximum temperature and the minimum temperature in the plate for steady one-dimensional heat transfer. Assume T. = 25°C. A=1 m?; L= 25 cm). = 20
In the system given in the figure below, a glass is heated under winter conditions. Since there are convection conditions on both surfaces of this glass, how much should the heat flow of the film heater be, considering that the t∞2 temperature is between 0-30?
Pr
Question 2:A circuit board houses on its surface120 closely spaced logic chips, each dissipating 0.12 W. If theheat transfer from the back surface of the board is negligible, calculate (a) the amount of heat this circuit board (15 cm x20 cm) dissipatesduring a 10-hour period, in kWh, and (b) the heat flux on thesurface of the circuit board, in W/m2
An electrical wire with 0.4cm in diameter and 2.5m long extends across a room with 15deg C temperature. Heat is generated in the wire as a result of resistance heating, and the surface of the wire is measured to be 162degC. the voltage drop and electric current along the wire is 60V and 1.64 A, respectively. Determine the convection heat transfer coefficient for the heat transfer between the surface of the wire and the room air. Hint, electric power formula. Round your answer to 2 decimal places.
Please solve this problem THank you
A wall receives sunlight from 7:30 am to 6:30 pm. The amount of energy it receives is 420 W/m2 and 15% is emitted as radiation into the surrounding air. The inside of the wall has a temperature of 48°C. If the wall is 7 m long and 6 m high and 30 cm thick, what is the temperature when x=20 cm?
نقطتان )2( A sphere ( k=204 W/m K) with inner diameter 4 cm and outer diameter of 8 cm. The inside temperature is 100C and the outer temperature 50 C. Calculate the rate of heat transfer
The outside temperature on a particular winter's day is 0°C. Consider two identical houses, each of external surface area 200 m² and internal temperature 20°C. The walls of the first are constructed of a single layer of brick, of thermal conductivity 1 W m-1 °C-1 and thickness 20 cm. What is the heat flux Q out of this house? What is its rate of heat loss in Watts? The walls of the second house are constructed of two layers of brick, each 10 cm thick, and a layer of insulation, also 10 cm thick. The insulation is made mostly out of air, thermal conductivity 0.01 W m of heat loss from this house? How different would your answer be if you neglected the layers of brick in this calculation? -1 °C-1. what are the heat flux and the rate
Calculate the heat transfer in kj per hour through a solid brick wall 9 cm, 3 m high and 219 mm thick, when the outer surface is at 5C and the inner surface 17C, the coefficient of thermal conductivity of the brick is 0.6 W/m-K.