Engineering, 13.11.2019 20:31 jackievelasquez7881
Hot combustion gases of a furnace are flowing througha concrete chimney (k =1.4 w/m · °c) of rectangular cross section. the flow section of the chimney is 20 cm ×40 cm, and the thickness of the wall is 10 cm. the average temperatureof the hot gases in the chimney is ti=280°c, and the averageconvection heat transfer coefficient inside the chimney is hi=75 w/m2· °c. the chimney is losing heat from its outer surfaceto the ambient air at to=15°c by convection with a
Answers: 2
Engineering, 04.07.2019 18:20
Most leaks in reciprocating air compressors can be detected and minimized by: (clo4) a)-detecting leakage areas using ultrasonic acoustic detector. b)-tightening joints and connections c)-replacing faulty equipment d)-all of the given options
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Engineering, 04.07.2019 19:10
Estimate the change in specific internal energy au and specific enthalpy h from inlet to outlet for ethylene glycol (a liquid) flowing through each of the following devices: (a) a heat exchanger where the glycol temperature increases from 20 °c to 80 °c; (b) a pump operating at about 25 °c and increasing the glycol pressure from 100 kpa to 8 mpa.
Answers: 2
Engineering, 06.07.2019 02:30
Air (c-1.006 kj/kg.k, r-0.287 kj/kg.k) enters a nozzle steadily at 280 kpa and 77°c with a velocity of 50 m/s and exits at 85 kpa and 320 m/s. the heat losses from the nozzle to the surrounding medium at 20°c are estimated to be 3.2 kj/kg. determine (a) the exit temperature and (b) the total entropy change for this process. solve this problem using constant specific heats.
Answers: 1
Hot combustion gases of a furnace are flowing througha concrete chimney (k =1.4 w/m · °c) of rectang...
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