Engineering, 18.06.2020 20:57 batista68
A hollow pure copper sphere with an electrical heater in the center is used in tests at steady-state conditions to determine the thermal conductivity of insulating materials. The inner diameter of the sphere is 0.250m; the outer diameter is 0.300m. For this test, the inner temperature of the pure copper sphere is held at a constant temperature of 225.0°C. The pure copper sphere is uniformly covered with an insulating material, 0.0800m thick. The outside of the insulating material is exposed to convection ; Too 25.0°C, h = 22.0 W/ (m2-K). The powe r required to keep the inner surface of the sphere at 2250°C is 75.0W (this is then equal to the heat transfer rate, g). Ignoring contact resistance, determine the thermal conductivity of the insulating material, k.
Answers: 1
Engineering, 04.07.2019 18:10
Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.
Answers: 1
Engineering, 04.07.2019 18:10
Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.
Answers: 2
Engineering, 04.07.2019 18:10
Afull journal bearing has a journal diameter of 27 mm, with a unilateral tolerance of -0.028 mm. the bushing bore has a diameter of 27.028 mm and a unilateral tolerance of 0.04 mm. the l/d ratio is 0.5. the load is 1.3 kn and the journal runs at 1200 rev/min. if the average viscosity is 50 mpa-s, find the minimum film thickness, the power loss, and the side flow for the minimum clearance assembly.
Answers: 1
Engineering, 04.07.2019 18:20
Aheavily insulated piston-cylinder device contains 0.02 m3 of steam at 300 kpa and 200 °c. 1.2 mpa. d this process. team is now compressed in a reversible manner to a pressure of etermine the entropy change and the work done on the steam during this process
Answers: 1
A hollow pure copper sphere with an electrical heater in the center is used in tests at steady-state...
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