Homework Answers
Add Answer to:
A composite wall is comprised of two large plates separated by sheets of refractory insulation, as...
A house has a composite wall of wood, fiberglass insulation, and plaster board, as indicated in...
A house has a composite wall of wood, fiberglass insulation, and
plaster board, as indicated in the sketch. On a cold day, the
temperature and the convection heat transfer coefficients are T∞,i
=20°C, hi =30 W/m2K and T∞,o=−15°C, ho =60 W/m2K. The wall surface
area is 350 m2. Determine the total heat loss through the wall.
Conductivities are given as b k =0.038 W/m.K, s k =0.012 W/m.K, p k
=0.17 W/m.K
Glass fiber blanket (28 kg/m3), kn Plaster board,...
4.16 Two large diffuse gray parallel plates, separated by a small distance, have surface temperature of...
4.16 Two large diffuse gray parallel plates, separated by a small distance, have surface temperature of 400 K and 300 K. IF the emissivities of the surfaces are 0.8 and the Stefan-Boltzmann constant is 5.67 x 10-8 W/m3K4, the net radiation heat exchange rate in kW/m2 between the two plates is (a) 0.66 (c) 0.99 (b) 0.79 (d) 3.96
For such aircraft application (Figure 3), a wall is made from insulation material (k-0.030 W/m.K) and...
For such aircraft application (Figure 3), a wall is made from insulation material (k-0.030 W/m.K) and the insulation material is mounted between four layers of carbon steel (2 mm thickness), the carbon layers are separated by a 2 mm air gap (kair-0.025 W/mK). Figure 3, the thermal conductivity of the carbon steel is (k-15.5 W/m.K). The temperature inside the wall is maintained at 6 °C. The environmental temperature is 24°C. The engineer would like to avoid condensation occurring at outer...
1. A house has a composite wall of wood, fiberglass insulation, and plaster board, as indicated...
1. A house has a composite wall of wood, fiberglass insulation, and
plaster board, as indicated below. On a cold winter day the
convection heat transfer coefficients are ho
=
60 W/m2K
and hi
=
30 W/m2K.
The total wall surface area is 350 m2.
(a) Determine the heat transfer rate through the wall in
Watts.
(b) If the wind were blowing violently, raising ho
to 300 W/m2K,
determine the percentage
increase in the heat transfer rate.
(c) What is...
Hot CO2 gas at a temperature T-1 = 250°C is flowing through a steel pipe (kı...
Hot CO2 gas at a temperature T-1 = 250°C is flowing through a steel pipe (kı = 70 W/(m.K)) whose inner and outer radiuses are 12 cm and 14 cm, respectively, in a cold environment at Tm2 = -10°C. As shown in the figure below, the steel pipe is insulated with 7.0 cm thick spray-foam insulation (k2 = 0.03 W/(m.K)) and 5.0 cm thick glassfiber insulation (k3 = 0.05 W/(m.K)). Consider the heat transfer coefficients of CO2 gas and the...
Consider the following composite wall of a building. It is made out of plaster board (Lp...
Consider the following composite wall of a building. It is made out of plaster board (Lp 0.85 W/mK), glass fibre insulation (Lb-160 mm, k = 0.050 W/mK) and plywood (1,-40 m m, k = 0.70 W/mK) as shown below. On a certain day, the convective heat transfer coefficients inside and outside of the building are 35 W/m2K and 65 W/m2 K respectively. The inside and outside temperatures are 24°C and 36°C respectively. The wall has a total surface area of...
A house has a composite wall of wood (exterior) (k = 0.12 W m-1 K -1...
A house has a composite wall of wood (exterior) (k = 0.12 W m-1 K -1 , 20 mm thick), fibreglass insulation (k = 0.045 W m-1 K -1 , 70 mm thick) and plasterboard (interior) (k = 0.25 W m-1 K -1 , 10 mm thick). Determine the total heat loss through the wall when the inside temperature is 20 °C, the outside temperature is -10 °C, the inside heat transfer coefficient is 15 W m-2 K -1, and...
Two large parallel plates of smooth sheet iron are separated by a vacuum. Coulson and Richardson...
Two large parallel plates of smooth sheet iron are separated by a vacuum. Coulson and Richardson (1999) reports that the emissivity of smooth sheet iron is in the range of 0.55 – 0.60 (OK to assume grey bodies). The temperatures of the sheets are 300 and 100°F. If the two surfaces are at the lower end of emissivity (0.55), what is the net radiation heat flux from the hotter surface to the cooler one, Q12/A ([=] W/m2)? Repeat part (a)...
THE FINITE VOLUME a composite wall is made of two materials (A with ka = 0.8...
THE FINITE VOLUME a composite wall is made of two materials (A with ka = 0.8 W / m-K and B with kb = 4 W / m-K), each with a thickness L = 10 mm. The surface of the wall A at x = 0 is perfectly insulated. A very thin heater is placed between the insulator and material A, giving a heat flow of 4500 W / m2. The wall surface at x = 2L is exposed to...
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C...
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C and 100°C, respectively. Determine the rate of heal transfer by radiation between the plates in Wim and the radiative heat transfer coefficient in W/m K ) 12 Write down the one-dimensional sent heal conduction equation for a plane wall with constant thermal conductivity and heat generation in its simplest form, and indicate what each variable represents 13 Write down the one-dimensional transient heat conduction...
A house has a composite wall of wood, fiberglass insulation, and
plaster board, as indicated in the sketch. On a cold day, the
temperature and the convection heat transfer coefficients are T∞,i
=20°C, hi =30 W/m2K and T∞,o=−15°C, ho =60 W/m2K. The wall surface
area is 350 m2. Determine the total heat loss through the wall.
Conductivities are given as b k =0.038 W/m.K, s k =0.012 W/m.K, p k
=0.17 W/m.K
Glass fiber blanket (28 kg/m3), kn Plaster board,...
4.16 Two large diffuse gray parallel plates, separated by a small distance, have surface temperature of 400 K and 300 K. IF the emissivities of the surfaces are 0.8 and the Stefan-Boltzmann constant is 5.67 x 10-8 W/m3K4, the net radiation heat exchange rate in kW/m2 between the two plates is (a) 0.66 (c) 0.99 (b) 0.79 (d) 3.96
For such aircraft application (Figure 3), a wall is made from insulation material (k-0.030 W/m.K) and the insulation material is mounted between four layers of carbon steel (2 mm thickness), the carbon layers are separated by a 2 mm air gap (kair-0.025 W/mK). Figure 3, the thermal conductivity of the carbon steel is (k-15.5 W/m.K). The temperature inside the wall is maintained at 6 °C. The environmental temperature is 24°C. The engineer would like to avoid condensation occurring at outer...
1. A house has a composite wall of wood, fiberglass insulation, and
plaster board, as indicated below. On a cold winter day the
convection heat transfer coefficients are ho
=
60 W/m2K
and hi
=
30 W/m2K.
The total wall surface area is 350 m2.
(a) Determine the heat transfer rate through the wall in
Watts.
(b) If the wind were blowing violently, raising ho
to 300 W/m2K,
determine the percentage
increase in the heat transfer rate.
(c) What is...
Hot CO2 gas at a temperature T-1 = 250°C is flowing through a steel pipe (kı = 70 W/(m.K)) whose inner and outer radiuses are 12 cm and 14 cm, respectively, in a cold environment at Tm2 = -10°C. As shown in the figure below, the steel pipe is insulated with 7.0 cm thick spray-foam insulation (k2 = 0.03 W/(m.K)) and 5.0 cm thick glassfiber insulation (k3 = 0.05 W/(m.K)). Consider the heat transfer coefficients of CO2 gas and the...
Consider the following composite wall of a building. It is made out of plaster board (Lp 0.85 W/mK), glass fibre insulation (Lb-160 mm, k = 0.050 W/mK) and plywood (1,-40 m m, k = 0.70 W/mK) as shown below. On a certain day, the convective heat transfer coefficients inside and outside of the building are 35 W/m2K and 65 W/m2 K respectively. The inside and outside temperatures are 24°C and 36°C respectively. The wall has a total surface area of...
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C and 100°C, respectively. Determine the rate of heal transfer by radiation between the plates in Wim and the radiative heat transfer coefficient in W/m K ) 12 Write down the one-dimensional sent heal conduction equation for a plane wall with constant thermal conductivity and heat generation in its simplest form, and indicate what each variable represents 13 Write down the one-dimensional transient heat conduction...
Most questions answered within 3 hours.
-
Can someone explain the process of this Display a text
file program and show the supposed...
asked 10 minutes ago -
When a solid dissolves in water, heat may be evolved or
absorbed. The heat of dissolution...
asked 13 minutes ago -
Leechtown Co. has 4.3 percent coupon bonds on the market with 18
years left to maturity....
asked 14 minutes ago -
Comment on how the conference could have been improved What
additional elements would you consider adding...
asked 24 minutes ago -
Sandra Clothing Company has invested $51,000,000 in its
business. The target rate of return for the...
asked 24 minutes ago -
"Discover the privacy concerns when applying Artificial
Intelligence into Big Data"
asked 25 minutes ago -
Explain why organisms that can survive and/or grow under aerobic
conditions need the enzymes catalase and...
asked 31 minutes ago -
Moonwalker Corporation issued 2,000 shares of its $10 par value
common stock for $60,000. Moonwalker also...
asked 30 minutes ago -
A microphone connected to an amplifier takes a 10 dB voice and
turns it into a...
asked 35 minutes ago -
Suppose the mean time spent by all Harper College students
preparing for final exams is believed...
asked 50 minutes ago -
Imagine you are examining the effects of smoking in
heart-disease death rates. You collect an SRS...
asked 52 minutes ago -
Use the price-demand equation to find E(p), the elasticity of
demand.
x=f(p)=150 - 55 ln(p)
E(p)...
asked 47 minutes ago