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A vertical wall is at a temperature of 100C. It is situated in a 20C room. If the height of the square wall is 10cm, and the surface emissivity is 0.9, calculate the rate of heat transfer to the room and the air. Include both natural convection and radiation. Repeat the calculation for an emissivity value of 0.1.
consider a well insulated container of total volume v.a initially the container is divided into 2 equal parts using a
a designer is working with analuminum oxide al2o3 component with a thermal conductivity of 20.06 wmk. fully dense
a long flat bar has the s-n diagram. the bar is 6in wide by .5 in thick. it has a 2 in hole in the middle.a what is the
a thin-flat plate having a length of l 10 cm is heated by a constant-heat flux from the bottom and cooled by an air
a 600 mw coal-fired power plant has an overall thermal efficiency of 38. it is burning coal that has a heating value of
A lap joint needs to be designed using 20-mm diameter bolts to carry a load of 120 kN on the connecting plates. If the shear stress in each rivet is not to exceed 90 MPa, determine the number of bolts needed.
(a) Sketch the cycle on a p V diagram. (b) Calculate the net work for the cycle, in kJ. (c) Calculate the heat transfer for process 2 3, in kJ. (d) Calculate the heat transfer for process 3 1, in kJ. (e) Is this a power cycle or a refrigeration cy..
Refrigerant R-134a is compressed steadily and adiabatically in a reversible compressor. The volume flow rate entering the compressor is 800 ft3/min.
at steady state a well-insulated compressor takes in air at 60 degrees f 14.2 lbfin2 with a volumetric flow rate of
a long aluminum bar has a diameter of 11 cm and is initially uniform in temperature at 300 c. if it suddenly exposed to
consider the following probability distribution function for a continuous random variablefx 3x6235 -2ltxlt-3
compute the estimated endurance strength for a 20.0mm-diameter rod machined from aisi 5160 oqt 1300 steel and subjected
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