Engineering, 14.09.2019 05:30 eskarletche8
Consider a glass window that is 5mm thick, 60cm wide, and 90cm tall and has a thermal conductivity of 0.96 w/m*k. how much heat is lost through this glass window versus a 10-cm thick brick wall (k = 0.69 w/m*k) with the same width and height if the inside surface temperature is 23°c and the outside surface temperature is 0°c? we know temperature of the surface so we can ignore any heat loss due to convection. a large fan blows hot air at 85°c over a 3m x 9m flat surface with a surface temperature of 37°c. previous experiments indicated that the heat transfer coefficient is 50 w/m2*k. determine the rate of heat transfer from the air to the plate.
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, 04.07.2019 18:10
Which of the following components of a pid controlled accumulates the error over time and responds to system error after the error has been accumulated? a)- proportional b)- derivative c)- integral d)- on/off.
Answers: 2
Engineering, 04.07.2019 18:10
Water at the rate of 1 kg/s is forced through a tube with a 2.5 cm inner diameter. the inlet water temperature is 15°c, and the outlet water temperature is 50°c. the tube wall temperature is 14°c higher than the local water temperature all along the length of the tube. what is the length of the tube?
Answers: 3
Engineering, 04.07.2019 18:20
Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]
Answers: 1
Consider a glass window that is 5mm thick, 60cm wide, and 90cm tall and has a thermal conductivity o...
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