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tly of ach its ate ties K, mm M.C in a the d ?) The roof of a refrigerated truck compartment is of com- 2. posite construction, consisting of a layer of foamed urethane insulation (t₂ = 50 mm, k, = 0.026 W/m K) ini sandwiched between aluminum alloy panels (t₁ = = 5 mm, kp 180 W/m K). The length and width of the roof are anaian L = 10 m and W = 3.5 m, respectively, and the temper- s,i ature of the inner surface is T, = -10°C. Consider con- ditions for which the truck is moving at a speed of V = 105 km/h, the air temperature is T = 32°C, and the bono solar irradiation is Gs = 750 W/m². Turbulent flow may be assumed over the entire length of the roof. (a) For equivalent values of the solar absorptivity and bris be the emissivity of the outer surface (as == 0.5), estimate the average temperature Ts, of the outer surface. What is the corresponding heat load imposed on the refrigeration system? (b) A special finish (as = 0.15, & = 0.8) may be applied to the outer surface. What effect would such an application have on the surface temperature and the heat load? (c) If, with as = &= 0.5, the roof is not insulated (t2 = 0), what are the corresponding values of the 10/surface temperature and the heat load? Other sides of the truck are all perfectly insulating, (heat transfer are G. Ts,o Ts.i ignored at those V, T places) Frank & Dave's Frozen Desserts for Those Who Don't Count Calories

tly of ach its ate ties K, mm M.C in a the d ?) The roof of a refrigerated truck compartment is of com- 2. posite construction, consisting of a layer of foamed urethane insulation (t₂ = 50 mm, k, = 0.026 W/m K) ini sandwiched between aluminum alloy panels (t₁ = = 5 mm, kp 180 W/m K). The length and width of the roof are anaian L = 10 m and W = 3.5 m, respectively, and the temper- s,i ature of the inner surface is T, = -10°C. Consider con- ditions for which the truck is moving at a speed of V = 105 km/h, the air temperature is T = 32°C, and the bono solar irradiation is Gs = 750 W/m². Turbulent flow may be assumed over the entire length of the roof. (a) For equivalent values of the solar absorptivity and bris be the emissivity of the outer surface (as == 0.5), estimate the average temperature Ts, of the outer surface. What is the corresponding heat load imposed on the refrigeration system? (b) A special finish (as = 0.15, & = 0.8) may be applied to the outer surface. What effect would such an application have on the surface temperature and the heat load? (c) If, with as = &= 0.5, the roof is not insulated (t2 = 0), what are the corresponding values of the 10/surface temperature and the heat load? Other sides of the truck are all perfectly insulating, (heat transfer are G. Ts,o Ts.i ignored at those V, T places) Frank & Dave's Frozen Desserts for Those Who Don't Count Calories

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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tly of ach its ate ties K, mm M.C in a the d ?) The roof of a refrigerated truck compartment is of com- 2. posite construction, consisting of a layer of foamed urethane insulation (t₂ = 50 mm, k, = 0.026 W/m K) ini sandwiched between aluminum alloy panels (t₁ = = 5 mm, kp 180 W/m K). The length and width of the roof are anaian L = 10 m and W = 3.5 m, respectively, and the temper- s,i ature of the inner surface is T, = -10°C. Consider con- ditions for which the truck is moving at a speed of V = 105 km/h, the air temperature is T = 32°C, and the bono solar irradiation is Gs = 750 W/m². Turbulent flow may be assumed over the entire length of the roof. (a) For equivalent values of the solar absorptivity and bris be the emissivity of the outer surface (as == 0.5), estimate the average temperature Ts, of the outer surface. What is the corresponding heat load imposed on the refrigeration system? (b) A special finish (as = 0.15, & = 0.8) may be applied to the outer surface. What effect would such an application have on the surface temperature and the heat load? (c) If, with as = &= 0.5, the roof is not insulated (t2 = 0), what are the corresponding values of the 10/surface temperature and the heat load? Other sides of the truck are all perfectly insulating, (heat transfer are G. Ts,o Ts.i ignored at those V, T places) Frank & Dave's Frozen Desserts for Those Who Don't Count Calories
Transcribed Image Text:tly of ach its ate ties K, mm M.C in a the d ?) The roof of a refrigerated truck compartment is of com- 2. posite construction, consisting of a layer of foamed urethane insulation (t₂ = 50 mm, k, = 0.026 W/m K) ini sandwiched between aluminum alloy panels (t₁ = = 5 mm, kp 180 W/m K). The length and width of the roof are anaian L = 10 m and W = 3.5 m, respectively, and the temper- s,i ature of the inner surface is T, = -10°C. Consider con- ditions for which the truck is moving at a speed of V = 105 km/h, the air temperature is T = 32°C, and the bono solar irradiation is Gs = 750 W/m². Turbulent flow may be assumed over the entire length of the roof. (a) For equivalent values of the solar absorptivity and bris be the emissivity of the outer surface (as == 0.5), estimate the average temperature Ts, of the outer surface. What is the corresponding heat load imposed on the refrigeration system? (b) A special finish (as = 0.15, & = 0.8) may be applied to the outer surface. What effect would such an application have on the surface temperature and the heat load? (c) If, with as = &= 0.5, the roof is not insulated (t2 = 0), what are the corresponding values of the 10/surface temperature and the heat load? Other sides of the truck are all perfectly insulating, (heat transfer are G. Ts,o Ts.i ignored at those V, T places) Frank & Dave's Frozen Desserts for Those Who Don't Count Calories
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