Engineering, 24.03.2020 18:01 texassaint797
Liquid flows at steady state at a rate of 2 lb/s through a pump, which operates to raise the elevation of the liquid 100 ft from control volume inlet to exit. The liquid specific enthalpy at the inlet is 40.09 Btu/lb and at the exit is 40.94 Btu/lb. The pump requires 3 Btu/s of power to operate. If kinetic energy effects are negligible and gravitational acceleration is 32.174 ft/s2, the heat transfer rate associated with this steady state process is most closely:
A) 2.02 Btu/s from the liquid to the surroundings.
B) 3.98 Btu/s from the surroundings to the liquid.
C) 4.96 Btu/s from the surroundings to the liquid.
D) 1.04 Btu/s from the liquid to the surroundings.
Answers: 2
Btu/lb)
Btu/lb)
)
)
= 3 Btu/s![Q_{cv}-W{cv}+m[(h_1-h_2)+(\frac{V_1^2-V_2^2}{2})+g(z_1-z_2)]=0](/tpl/images/0561/0359/16e63.png)
![Q_{cv}-W{cv}+m[(h_1-h_2)+g(z_1-z_2)]=0](/tpl/images/0561/0359/3924d.png)
![Q_{cv}-(-3)+2[(40.09-40.94)+\frac{32.174(0-100)}{778*32.174} ]=0\\Q_{cv}+3+2[-0.85-0.1285 ]=0\\Q_{cv}+3+2(-0.9785)=0\\Q_{cv}+3-1.957=0\\Q_{cv}+1.04=0\\Q_{cv}=-1.04\\](/tpl/images/0561/0359/ef0f5.png)
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Liquid flows at steady state at a rate of 2 lb/s through a pump, which operates to raise the elevati...
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