Engineering, 11.07.2019 04:20 chrissycherry
Spheres with 40-mm diameter are heated to a uniform temperature of 400°c and then suddenly removed form the over and placed in a forced air bath operating at 25°c with a convection coefficient of 300 w/m^2 k on the sphere surfaces. the thermophysical properties of the sphere material are p=3000 kg/m^3 c=850j/kgk, and k=15 w/m k. 1)- how long must the spheres remain in the air bath for 80% of the thermal energy to be removed? 2)- once 80% of the thermal energy is removed, the spheres are then placed in an adiabatic enclosure that prevents any more heat transfer between the spheres and their surroundings what uniform temperature will the spheres eventually reach?
Answers: 1
Engineering, 04.07.2019 18:10
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Engineering, 04.07.2019 18:10
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Engineering, 04.07.2019 18:10
Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.
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Engineering, 04.07.2019 18:20
Water vapor initially at 10 bar and 400 °c is contained within a piston-cylinder assembly. the water lost heat to the surrounding according to isochoric (iso-volumetric) process until its temperature is 150 °c. the water is then condensed isothermally to saturated liquid. for the water as a system, calculate the work in kj/kg
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Spheres with 40-mm diameter are heated to a uniform temperature of 400°c and then suddenly removed f...
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