Chemistry

Chemistry, 16.10.2019 18:30, abiii7460

Aheat flux meter attached to the inner surface of a 3-cm-thick refrigerator door indicates a heat flux of 25 w/m² through the door. also, the temperatures of the inner and the outer surfaces of the door are measured to be 7°c and 15°c, respectively. determine the average thermal conductivity of the refrigerator door. 0.0938 w/m. c

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Physics, 06.08.2019 20:20, sanchezvazquez0123

The surface also exchanges heat with the surrounding walls of the enclosure by radiation. the total hemispherical emissivity of the surface is 0.9. the surface is completely surrounded so the surface behaves as if each portion of it interacts with a blackbody at the temperature of the enclosure walls. properties of the air are: k = 0.0261 w/mk, € ν =1.8 ×10−5 m 2 /s, pr = 0.73 and the stephan-boltzmann constant is € 5.67 ×10−8 w/m2 k4 . (a) determine the total heat flux from the surface at a location 4.5 cm from the lower edge. (b) sketch the variation of surface heat flux q” with x. (c) where is the absolute value of the surface heat flux smallest? (d) for this system, what is the asymptotic dependence of heat flux on x as the distance from the bottom becomes large?

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Engineering, 17.10.2019 00:30, zachthomas024

Standards for firewalls may be based on their thermal response to a prescribed radiant heat flux. consider a 0.25-m-thick concrete wall (rho= 2300 kg/m3, c= 880 j/kg·k, k= 1.4 w/m·k), which is at an initial temperature of ti= 25°c and irradiated at one surface by lamps that provide a uniform heat flux of qs′′= 0.85·104 w/m2. the absorptivity of the surface to the irradiation is αs= 1.0. if building code requirements dictate that the temperatures of the irradiated and back surfaces must not exceed 325°c and 25°c, respectively, after 30 min of heating, will the requirements b

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Physics, 19.10.2019 05:10, carmenala2

Standards for firewalls may be based on their thermal response to a prescribed radiant heat flux. consider a 0.25-m-thick concrete wall ( 2300 kg/m^3, 880 j/kg·k, 1.4 w/m·k), which is at an initial temperature of 25°c and irradiated at one surface by lamps that provide a uniform heat flux of 0.75·104 w/m^2. the absorptivity of the surface to the irradiation is 1.0. if building code requirements dictate that the temperatures of the irradiated and back surfaces must not exceed 325°c and 25°c, respectively, after 30 min of heating, will the requirements be met?

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Aheat flux meter attached to the inner surface of a 3-cm-thick refrigerator door indicates a heat fl...

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