Engineering, 11.07.2019 04:20 tfyvcu5344
The emissivity of a surface is 0.15 for radiation at wavelengths less than 3 μm and 0.9 for radiation at wavelengths greater than 3 μm. a)-determine the average emissivity of the surface at 5800 k b)-determine the average emissivity of the surface at 300k c)-if kirchoff's law applies, what is the absorptivity of this surface when irradiated with sunlight? d)- would this make a better solar reflector or solar absorber?
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Engineering, 03.07.2019 14:10
Line joining liquid phase with liquid and solid phase mixture is known as: a) liquidus b) solidus c) tie line d) none of the mentioned
Answers: 2
Engineering, 04.07.2019 18:10
Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.
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
List and describe in sequence the operation process steps for boxf machine?
Answers: 1
The emissivity of a surface is 0.15 for radiation at wavelengths less than 3 μm and 0.9 for radiatio...
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