Water flows at a very low velocity in a pipeline at 30 psig, 60degreeF. Water is
ID: 1419407 • Letter: W
Question
Water flows at a very low velocity in a pipeline at 30 psig, 60degreeF. Water is to be drawn from this line at a steady rate of 25 gpm by a pump and discharged through a pipe 25 ft higher where the pressure is 60 psig. The discharge line has an inside diameter of 1.05 in. Assuming that there is no heat transfer and no change in Internal energy of the water, determine the amount of power delivered to the water by the pump in hp. A gas enters an insulated steady-flow system at 200 kPa, 27degtreeC with an enthalpy of 214 kJ/kg and a velocity of 70 m/s, at a rate of 0.0023 kg/s. Within the system, the gas stream is separated into two streams, and measurement shows that one stream leaves at 100 kPa with an enthalpy of 206 kJ/kg and a very low velocity at a rate of 0.0009 kg/s. The other leaving stream has a very low velocity. What is its enthalpy? Assume no work is done during the process. A thermodynamic steady flow system receives 4.56 kg per min of a fluid where P_1 = 137.9 kPa, U_1 = 0.0388 m^3/kg, v_1 = 122 m/s, and u_1 = 17.16 kJ/kg. The fluid leaves the system at a boundary where P_2 = 551.6 kPa, u_2 = 0.193 m^3/kg, v_2 = 183 m/s and u_2 = 52.80 kJ/kg. During the passage through the system the fluid receives 3 000 J/s of heat. Determine the work in kJ/min. Is it done on or by the system? A reciprocating compressor draws in 500 cubic feet per min of air whose density is 0.079 Ib/cu. ft. and discharges it with density of 0.304 Ib/cu. ft. At the suction, P_1 = 15 psia; at discharge, P_2 = 80 psia. The increase in the specific internal energy is 33.8 Btu/Ib and the heat transferred from the air by cooling is 13 Btu/Ib. Determine the work on the air in hp.Explanation / Answer
Ans 3) enthalpy, h1 = u1 + p1*v1 = 17.16 + (137.9*0.0388) = 22.51KJ/Kg
h2 = u2 + p2*v2 = 52.8 + 551.6*0.193 = 159.2588KJ/Kg
Q = 3KJ/s, m = 0.076Kg/s
W = 3+ 0.076(22.51 +(1222 / 2000) -159.2588 - (1832 / 2000))
W = -8.099KJ/s
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