Engineering, 30.03.2021 23:30 kimlyn58p0wyn0
The defrost of an automobile function by discharging warm air on the inner surface of windshield. To prevent condensation of water on the inner surface, the temperature of the air and surface convection coefficient must be large enough to maintain a surface termperature Ts, i that is at least as high as the dew point temperature, Ts, i > Tdewp. Consider a windshield of length L=800 mm, and thickness t=6 mm, and driving conditions for which the vehicle moves at velocity of V=162 Km/h in ambient air at -15°C. The average convective heat trasfer coefficient on the outside of the windshield may be determined from the correlation.
NuL=0.0295.Re^0.8LPr^1/3
Required:
a. If Tdewp=10 and T[infinity],i=50CC, what is the smallest value for hihi required to prevent condensation the inner surface.
b. Plot the thermal equivalent circuit. write the thermal resistances on the circuit
Answers: 2
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
Engineering, 06.07.2019 03:10
Consider two concentric spheres forming an enclosure with diameters of 12 cm and 18 cm the spheres are maintained at uniform temperatures ti-50°c and t2 = 250°c and have emissivities .45 and .8, respectively. determine the net rate of radiation heat transfer between the two spheres per unit surface area.
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Engineering, 06.07.2019 04:20
Consider the transfer function for a first-order system g(s)=12(s+7)/(s^2+2s+9) for this system determine: a) poles and zeros of the function, b) the natural frequency and damping ratio, c) the peak value achieved in response to a unit step input, d) the peak time for a unit step input, e) the steady-state system response to a unit step input
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Engineering, 06.07.2019 05:20
Acantilever of 3 m length with a t-shaped cross-section is loaded by three concentrated loads: w,-80 n at the free end, w 30 n, and w,-60 n at a distance of 1 m from the free end. all loads are applied at the outer edges of the flange as indicated in the sketch below. (a)-determine the maximum torsional shear stresses in the flange and in the web at distances 0.5 m and 2.5 m from the free end (sections i and ii marked in the sketch) b)- determine thefh end cross section assuming a shear modulus of 210 gpa.
Answers: 3
The defrost of an automobile function by discharging warm air on the inner surface of windshield. To...
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