Engineering, 26.02.2020 01:20 keeks11
Consider a composite wall consisting of 1 cm of plywood (on the inside) and 11 cm brick (on the outside) separated by 10 cm of glass fiber blanket (of density 40 kg/m?). The interior of the wall is exposed to 21°C air with a convection coefficient of 20 W/m²K and the exterior of the wall is exposed to -10°C air with a convection coefficient of 50 W/m²K. The surface area of the wall is 300 m². a. Find the total thermal resistance, overall heat transfer coefficient, and heat transfer rate from the inside air to the outside air. b. If the convection coefficient of the outside air on a windy day was 250 W/m² instead, by what percentage would the heat transfer rate be different? c. Would you expect that radiation would significantly affect your calculations? Why or why not?
Answers: 1
Engineering, 03.07.2019 23:20
Two technicians are discussing the intake air temperature (iat) sensor. technician a says that the computer uses the iat sensor as a backup to the engine coolant temperature (ect) sensor. technician b says that the powertrain control module (pcm) will subtract the calculated amount of fuel if the air measures hot. who is correct
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Engineering, 04.07.2019 18:10
The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false
Answers: 1
Engineering, 04.07.2019 18:10
Water in a partially filled large tank is to be supplied to the roof top, which is 8 m above the water level in the tank, through a 2.2-cm-internal-diameter pipe by maintaining a constant air pressure of 300 kpa (gage) in the tank. if the head loss in the piping is 2 m of water, determine the discharge rate of the supply of water to the roof top in liters per second.
Answers: 3
Engineering, 06.07.2019 03:20
What is the maximum height from which a mass of 30 kg can fall on to a flange on the lower end of a vertical rod of length 1.0 m and diameter 20 mm, the upper end being rigidly fixed, if the stress in the rod is not to exceed 80 mpa? the tensile modulus of the rod is 200 gpa.
Answers: 3
Consider a composite wall consisting of 1 cm of plywood (on the inside) and 11 cm brick (on the outs...
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