A new building to be located in a cold climate is beingdesigned with a basement that has an L = 20 0-mm-thick wall. Inner and outer basement wall temperatures are T i = 20 ° C and T o = 0 ° C, respectively. The architect canspecify the wall material to be either aerated concreteblock with k ac = 0.15 W/m ⋅ K, or stone mix concrete. Toreduce the conduction heat flux through the stone mixwall to a level equivalent to that of the aerated concretewall, what thickness of extruded polystyrene sheet mustbe applied onto the inner surface of the stone mix concretewall? Floor dimensions of the basement are 20 m × 30 m , and the expected rental rate is $ 50 / m 2 / income, What is the yearly cost, in terms of lost rentalincome, if the stone mix concrete wall with polystyreneinsulation is specified?
A new building to be located in a cold climate is beingdesigned with a basement that has an L = 20 0-mm-thick wall. Inner and outer basement wall temperatures are T i = 20 ° C and T o = 0 ° C, respectively. The architect canspecify the wall material to be either aerated concreteblock with k ac = 0.15 W/m ⋅ K, or stone mix concrete. Toreduce the conduction heat flux through the stone mixwall to a level equivalent to that of the aerated concretewall, what thickness of extruded polystyrene sheet mustbe applied onto the inner surface of the stone mix concretewall? Floor dimensions of the basement are 20 m × 30 m , and the expected rental rate is $ 50 / m 2 / income, What is the yearly cost, in terms of lost rentalincome, if the stone mix concrete wall with polystyreneinsulation is specified?
Solution Summary: The author explains the thickness of the floor and yearly cost for stone mix concrete wall with polystyrene insulation.
A new building to be located in a cold climate is beingdesigned with a basement that has an
L
=
20
0-mm-thick
wall. Inner and outer basement wall temperatures are
T
i
=
20
°
C
and
T
o
=
0
°
C,
respectively. The architect canspecify the wall material to be either aerated concreteblock with
k
ac
=
0.15
W/m
⋅
K,
or stone mix concrete. Toreduce the conduction heat flux through the stone mixwall to a level equivalent to that of the aerated concretewall, what thickness of extruded polystyrene sheet mustbe applied onto the inner surface of the stone mix concretewall? Floor dimensions of the basement are
20
m
×
30
m
,
and the expected rental rate is
$
50
/
m
2
/
income,
What is the yearly cost, in terms of lost rentalincome, if the stone mix concrete wall with polystyreneinsulation is specified?
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The cantilevered spandrel beam shown whose depth tapers from d1 to d2, has a constant width of 120mm. It carries a triangularly distributed end reaction.Given: d1 = 600 mm, d2 = 120 mm, L = 1 m, w = 100 kN/m1. Calculate the maximum flexural stress at the support, in kN-m.2. Determine the distance (m), from the free end, of the section with maximum flexural stress.3. Determine the maximum flexural stress in the beam, in MPa.ANSWERS: (1) 4.630 MPa; (2) 905.8688 m; (3) 4.65 MPa
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A concrete wall retains water as shown. Assume that the wall is fixed at the base. Given: H = 3 m, t = 0.5m, Concrete unit weight = 23 kN/m3Unit weight of water = 9.81 kN/m3(Hint: The pressure of water is linearly increasing from the surface to the bottom with intensity 9.81d.)1. Find the maximum compressive stress (MPa) at the base of the wall if the water reaches the top.2. If the maximum compressive stress at the base of the wall is not to exceed 0.40 MPa, what is the maximum allowable depth(m) of the water?3. If the tensile stress at the base is zero, what is the maximum allowable depth (m) of the water?ANSWERS: (1) 1.13 MPa, (2) 2.0 m, (3) 1.20 m
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A short plate is attached to the center of the shaft as shown. The bottom of the shaft is fixed to the ground.Given: a = 75 mm, h = 125 mm, D = 38 mmP1 = 24 kN, P2 = 28 kN1. Calculate the maximum torsional stress in the shaft, in MPa.2. Calculate the maximum flexural stress in the shaft, in MPa.3. Calculate the maximum horizontal shear stress in the shaft, in MPa.ANSWERS: (1) 167.07 MPa; (2) 679.77 MPa; (3) 28.22 MPa
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