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Engineering, 06.11.2019 05:31 bxbykyah
Is a caliper more precise than a ruler?
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Engineering, 06.07.2019 04:10, idjfjcjs584
Along steel shaft of 10 cm diameter is austenised at 870°c and then quenched in a liquid at 30oc. the average surface heat transfer coefficient is 2000 w/m2. °c. the relevant thermophysical properties of the shaft are: p=7800 kg/m", k=20 w/mk, cp=0.46 kj/kg. k calculate: a)-the time required for the center temperature to drop to 200°c. b)-the temperature at half-radius at that moment. c)-the amount of heat that had been transferred to the liquid by that time per meter length of the shaft
Answers: 1
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Engineering, 06.07.2019 04:20, Graciouzgigi1394
Steam in a heating system flows through tubes whose outer radius is 2.5 cm and whose walls are maintained at a temperature of 180 °c . circular aluminum alloy 2024-t6 fins ( k= 186 wm. k) of outer radius 3 cm and constant thickness 1 mm are attached to the tube. the space between the fins is 3 mm and thus there are 250 fins per meter of tube length. heat is transferred to the surrounding air at too-25 °c, with a heat transfer coefficient of 40 w/m2. k. manufacturer a claims that this system is rated at 3.5 kw per meter of tube length. if the fins are an integral part of the steam tube, find the heat transfer rate in kw for a 1-m length of tube. is manufacturer a's claim valid? compare the heat transfer rate from 1 meter of tube length if there are no fins.
Answers: 3
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Engineering, 06.07.2019 05:10, joejoefofana
Determine the heat loss per hour from a wall of a build- ing when the wind is blowing parallel to its surface with a speed of 2 km/hour. the wall is 5 metre long and 3 metre high. tempe rature of the wall is 25°c and air temperature is 5°c.
Answers: 2
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