A composite wall of room is composed of three layers 1,2 and 3 such that the conductivity of the layers are as follows K1 = 1W/mk, K2 = Ak1, where A is a constant, and K3 = 2K2. The three layers have the same thickness equal to 0.2 m. The ambient temperature is variable and depends on a heat flux that is given by q"= 5t^2+58 where t is the time. On the other hand, the inner surface temperature of the composite wall is equal to 28 C and the outer surface temperature is given by To = 2t^2-4t +B where B is a constant. If the steady state winter configuration is considered where the outside temperature is lower than the inside temperature. Determine the maximal value of the heat flux through the composite wall if A is equal to 2 and B is equal to 4 C. Select one: O a. 55.8 W/m^2 b. 91.6 W/m^2 O c. 61.4 W/m^2 O d. 74.3 W/m^2

A composite wall of room is composed of three layers 1,2 and 3 such that the conductivity of the layers are as follows K1 = 1W/mk, K2 = Ak1, where A is a constant, and K3 = 2K2. The three layers have the same thickness equal to 0.2 m. The ambient temperature is variable and depends on a heat flux that is given by q"= 5t^2+58 where t is the time. On the other hand, the inner surface temperature of the composite wall is equal to 28 C and the outer surface temperature is given by To = 2t^2-4t +B where B is a constant. If the steady state winter configuration is considered where the outside temperature is lower than the inside temperature. Determine the maximal value of the heat flux through the composite wall if A is equal to 2 and B is equal to 4 C. Select one: O a. 55.8 W/m^2 b. 91.6 W/m^2 O c. 61.4 W/m^2 O d. 74.3 W/m^2

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Energy transfer

The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.

Molar Specific Heat

Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)

Thermal Properties of Matter

Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.

Question

A composite wall of room is composed of three layers 1,2 and 3 such that the conductivity of the layers are as follows K1 = 1W/mk, K2 = Ak1,
where A is a constant, and K3 = 2K2. The three layers have the same thickness equal to 0.2 m. The ambient temperature is variable and
depends on a heat flux that is given by q"= 5t^2+58 wheret is the time. On the other hand, the inner surface temperature of the composite
wall is equal to 28 C and the outer surface temperature is given by To = 2t^2-4t +B where B is a constant. If the steady state winter
configuration is considered where the outside temperature is lower than the inside temperature. Determine the maximal value of the heat
flux through the composite wall if A is equal to 2 and B is equal to 4 C.
Select one:
O a. 55.8 W/m^2
O b. 91.6 W/m^2
O c. 61.4 W/m^2
O d. 74.3 W/m^2

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