Engineering, 13.09.2019 18:30 lilblackbird4
As shown in fig. p3.119, a piston-cylinder assembly whose piston is resting on a set of stops contains 0.5 kg of helium gas. initially at 100 kpa and 25 degree c. the mass of the piston and the effect of the atmospheric pressure acting on the piston are such that a pressure of 500 kpa is required to raise it. how much energy must be transferred by heat to the helium, in kj. before the piston starts rising? assume ideal gas behavior for the helium.
Answers: 3
Engineering, 04.07.2019 12:10
On a average work day more than work place firs are reorted
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Engineering, 04.07.2019 18:10
An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet
Answers: 3
Engineering, 04.07.2019 18:10
Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk
Answers: 1
Engineering, 04.07.2019 18:10
Water at the rate of 1 kg/s is forced through a tube with a 2.5 cm inner diameter. the inlet water temperature is 15°c, and the outlet water temperature is 50°c. the tube wall temperature is 14°c higher than the local water temperature all along the length of the tube. what is the length of the tube?
Answers: 3
As shown in fig. p3.119, a piston-cylinder assembly whose piston is resting on a set of stops contai...
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