The roof of a refrigerated truck compartment is of com- posite construction, consisting of a layer of foamed urethane insulation (t = 50 mm, k; = 0.026 W/m·K) sandwiched between aluminum alloy panels (t¡ = 5 mm, k, = 180 W/m·K). The length and width of the roof are L = 10 m and W = 3.5 m, respectively, and the temper- 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 solar irradiation is G3=750 W/m². Turbulent flow may be assumed over the entire length of the roof.

The roof of a refrigerated truck compartment is of com- posite construction, consisting of a layer of foamed urethane insulation (t = 50 mm, k; = 0.026 W/m·K) sandwiched between aluminum alloy panels (t¡ = 5 mm, k, = 180 W/m·K). The length and width of the roof are L = 10 m and W = 3.5 m, respectively, and the temper- 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 solar irradiation is G3=750 W/m². Turbulent flow may be assumed over the entire length of the roof.

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

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Concept explainers

Processing of Polymer Matrix Composites

The polymer matrix composite is described as a composite material that contains some polymer in the form of either fibers or powder. Polymer matrix composites are also known in short as PMC's.

Question

7.20 The roof of a refrigerated truck compartment is of com-
posite construction, consisting of a layer of foamed
urethane insulation (t, = 50 mm, k; = 0.026 W/m ·K)
sandwiched between aluminum alloy panels (t, = 5 mm,
, = 180 W/m· K). The length and width of the roof are
7.
kp
L = 10 m and W = 3.5 m, respectively, and the temper-
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
solar irradiation is Gs= 750 W/m?. Turbulent flow may
be assumed over the entire length of the roof.
7.2
12
ɛ, a,
Frank & Dave's
V, T
Frozen Desserts for Those Who
Don't Count Calories
(a) For equivalent values of the solar absorptivity and
the emissivity of the outer surface (æs = ɛ = 0.5),
estimate the average temperature T30 of the outer
surface. What is the corresponding heat load imposed
on the refrigeration system?

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