Engineering, 11.07.2019 02:20 jacksonyodell4184
Asteel sphere with a diameter of 7.6 cm is to be hardened by first heating it to a uniform temperature of 870c and then quenching it in a large bath of water maintained at a temperature of 38c. the fluid motion in the quenching bath is such that it produces a convective heat transfer coefficient of h = 566 w/m2 · k. determine (a) the time required to cool the center of the sphere to 204c, and (b) the elapsed time when the surface of the sphere has cooled to 750c. and property values: k = 43 w/m · k, cp = 628 j/kg k, and = 7840 kg/m3 .
Answers: 3
Engineering, 04.07.2019 18:10
The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false
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Engineering, 04.07.2019 18:20
Avolume of 2.65 m3 of air in a rigid, insulated container fitted with a paddle wheel is initially at 264 k, 5.6 bar. the air receives 432 kj by work from the paddle wheel. assuming the ideal gas model with cv = 0.71 kj/kg • k, determine for the air the amount of entropy produced, in kj/k
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Engineering, 04.07.2019 18:20
Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.
Answers: 2
Asteel sphere with a diameter of 7.6 cm is to be hardened by first heating it to a uniform temperatu...
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