A dormitory at a large university, built 50 years ago, hasexterior walls constructed of L s = 25 -mm-thick sheathingwith a thermal conductivity of k s = 0.1 W/m ⋅ K . Toreduce heat losses in the winter, the university decidesto encapsulate the entire dormitory by applying an L i = 25 -mm-thick layer of extruded insulation characterizedby k i = 0.029 W/m ⋅ K to the exterior of theoriginal sheathing. The extruded insulation is, in turn,covered with an L g = 5 -mm-thick architectural glasswith k g = 1.4 W/m ⋅ K . Determine the heat flux throughthe original and retrofitted walls when the interior andexterior air temperatures are T ∞ , i = 22 ° C and T ∞ , o = − 20 ° C, respectively. The inner and outer convection heattransfer coefficients are h i = 5 W/m 2 ⋅ K and h o = 25 W/m 2 ⋅ K, respectively.
A dormitory at a large university, built 50 years ago, hasexterior walls constructed of L s = 25 -mm-thick sheathingwith a thermal conductivity of k s = 0.1 W/m ⋅ K . Toreduce heat losses in the winter, the university decidesto encapsulate the entire dormitory by applying an L i = 25 -mm-thick layer of extruded insulation characterizedby k i = 0.029 W/m ⋅ K to the exterior of theoriginal sheathing. The extruded insulation is, in turn,covered with an L g = 5 -mm-thick architectural glasswith k g = 1.4 W/m ⋅ K . Determine the heat flux throughthe original and retrofitted walls when the interior andexterior air temperatures are T ∞ , i = 22 ° C and T ∞ , o = − 20 ° C, respectively. The inner and outer convection heattransfer coefficients are h i = 5 W/m 2 ⋅ K and h o = 25 W/m 2 ⋅ K, respectively.
Solution Summary: The author explains the heat flux generated through the original and retrofitted walls.
A dormitory at a large university, built 50 years ago, hasexterior walls constructed of
L
s
=
25
-mm-thick
sheathingwith a thermal conductivity of
k
s
=
0.1
W/m
⋅
K
.
Toreduce heat losses in the winter, the university decidesto encapsulate the entire dormitory by applying an
L
i
=
25
-mm-thick
layer of extruded insulation characterizedby
k
i
=
0.029
W/m
⋅
K
to the exterior of theoriginal sheathing. The extruded insulation is, in turn,covered with an
L
g
=
5
-mm-thick
architectural glasswith
k
g
=
1.4
W/m
⋅
K
.
Determine the heat flux throughthe original and retrofitted walls when the interior andexterior air temperatures are
T
∞
,
i
=
22
°
C
and
T
∞
,
o
=
−
20
°
C,
respectively. The inner and outer convection heattransfer coefficients are
h
i
=
5
W/m
2
⋅
K
and
h
o
=
25
W/m
2
⋅
K,
respectively.
Find the equivalent mass of the rocker arm assembly with respect to the x coordinate.
k₁
mi
m2
k₁
2. Figure below shows a U-tube manometer open at both ends and containing a column of liquid
mercury of length l and specific weight y. Considering a small displacement x of the manometer
meniscus from its equilibrium position (or datum), determine the equivalent spring constant associated
with the restoring force.
Datum
Area, A
1. The consequences of a head-on collision of two automobiles can be studied by considering the
impact of the automobile on a barrier, as shown in figure below. Construct a mathematical model (i.e.,
draw the diagram) by considering the masses of the automobile body, engine, transmission, and
suspension and the elasticity of the bumpers, radiator, sheet metal body, driveline, and engine
mounts.
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