1) A wall section composed from the outside to inside, of concrete brick 100mm thick, an air space of50mm, two layers of fiberglass insulation 38mm thick, concrete block 150mm thick and air space of19mm and a gypsum board of 13mm. The exterior conditions are -20C and RH=90% while the interiorconditions are 23C and RH=40%. The surface temperature from the outside to inside are shown in thefigure. The permeances are:Still Air: µ = 175 ng/pa.s.mFiber glass: M=2560 ng/pa.s.m?Concrete block: M= 200 ng/pa.s.m?Gypsum board: M= 2000 ng/pa.s.m?Concrete brick: µ = 4.55 ng/pa.s.mDetermine if there is a risk of condensation, and if there is, what is the condensation rate?What would happen if a vapor barrier (M=0.2 ng/pa.s.m²) was installed on the warm side of theinsulation (Surface 4).21с 19C 16 С12C-10-15C-18C-19CGypAirConcreteFiberFiberAirConcreteOutdoorIndoorsumblockGlassGlassbrick2301950 mm-20C13150 mm38 mm | 38 mm100 mmRH=90%RH=40%mmmmSurf. 1Surf. 3Surf. 4Surf. 6Surf. 7Surf. 8Surf. 2Surf. 5

Conduction convection heat transfer through composite wall The composite divider is a divider that…

1) A wall section composed from the outside to inside, of concrete brick 100mm thick, an air space of 50mm, two layers of fiberglass insulation 38mm thick, concrete block 150mm thick and air space of 19mm and a gypsum board of 13mm. The exterior conditions are -20C and RH=90% while the interior conditions are 23C and RH=40%. The surface temperature from the outside to inside are shown in the figure. The permeances are: Still Air: µ = 175 ng/pa.s.m Fiber glass: M=2560 ng/pa.s.m? Concrete block: M= 200 ng/pa.s.m² Gypsum board: M= 2000 ng/pa.s.m? Concrete brick: u = 4.55 ng/pa.s.m Determine if there is a risk of condensation, and if there is, what is the condensation rate? What would happen if a vapor barrier (M=0.2 ng/pa.s.m²) was installed on the warm side of the insulation (Surface 4). 210 19C 16 C 120 -10 -150 -18C -19C Gyp Air Concrete Fiber Fiber Air Concrete Outdoor Indoor sum block Glass Glass brick 230 19 50 mm -200 13 150 mm 38 mm 38 mm 100 mm RH=90% RH=40% mm mm Surf. 1 Surf. 3 Surf. 4 Surf. 6 Surf. 7 Surf. 8 Surf. 2 Surf. 5

1) A wall section composed from the outside to inside, of concrete brick 100mm thick, an air space of 50mm, two layers of fiberglass insulation 38mm thick, concrete block 150mm thick and air space of 19mm and a gypsum board of 13mm. The exterior conditions are -20C and RH=90% while the interior conditions are 23C and RH=40%. The surface temperature from the outside to inside are shown in the figure. The permeances are: Still Air: µ = 175 ng/pa.s.m Fiber glass: M=2560 ng/pa.s.m? Concrete block: M= 200 ng/pa.s.m² Gypsum board: M= 2000 ng/pa.s.m? Concrete brick: u = 4.55 ng/pa.s.m Determine if there is a risk of condensation, and if there is, what is the condensation rate? What would happen if a vapor barrier (M=0.2 ng/pa.s.m²) was installed on the warm side of the insulation (Surface 4). 210 19C 16 C 120 -10 -150 -18C -19C Gyp Air Concrete Fiber Fiber Air Concrete Outdoor Indoor sum block Glass Glass brick 230 19 50 mm -200 13 150 mm 38 mm 38 mm 100 mm RH=90% RH=40% mm mm Surf. 1 Surf. 3 Surf. 4 Surf. 6 Surf. 7 Surf. 8 Surf. 2 Surf. 5

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

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

1) A wall section composed from the outside to inside, of concrete brick 100mm thick, an air space of
50mm, two layers of fiberglass insulation 38mm thick, concrete block 150mm thick and air space of
19mm and a gypsum board of 13mm. The exterior conditions are -20C and RH=90% while the interior
conditions are 23C and RH=40%. The surface temperature from the outside to inside are shown in the
figure. The permeances are:
Still Air: µ = 175 ng/pa.s.m
Fiber glass: M=2560 ng/pa.s.m?
Concrete block: M= 200 ng/pa.s.m?
Gypsum board: M= 2000 ng/pa.s.m?
Concrete brick: µ = 4.55 ng/pa.s.m
Determine if there is a risk of condensation, and if there is, what is the condensation rate?
What would happen if a vapor barrier (M=0.2 ng/pa.s.m²) was installed on the warm side of the
insulation (Surface 4).
21с 19C 16 С
12C
-10
-15C
-18C
-19C
Gyp
Air
Concrete
Fiber
Fiber
Air
Concrete
Outdoor
Indoor
sum
block
Glass
Glass
brick
230
19
50 mm
-20C
13
150 mm
38 mm | 38 mm
100 mm
RH=90%
RH=40%
mm
mm
Surf. 1
Surf. 3
Surf. 4
Surf. 6
Surf. 7
Surf. 8
Surf. 2
Surf. 5

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