i need answer with steps please complete the problem we were working in class on
ID: 2994111 • Letter: I
Question
i need answer with steps please
complete the problem we were working in class on Wednesday, There are two closed systems. Each system contains 1 Kg of water at 150 kPa with an initial quality of x = 0.9. One system is a fixed volume. The other system is a piston cylinder arrangement such that the pressure remains constant. In each case you are to determine the heat transfer required to reach an end state where x = 1.0. Write down the appropriate equations, state any simplifications, clearly state any constraints, and than solve the problem. You may find the online calculator link under Extras helpful. Keep In mind that Internal enemy can be determined from enthalpy, pressure, and specific volume If need be. u = h - PvExplanation / Answer
At P =150 kpa and x = 0.9
from steam tables
v1 = 1.044 m^3/kg
u1 = 2314 kJ/kg
h1 = 2471 kJ/kg
In Constant volume,work done is zero.So the heat transfer is only due to change in internal energy
In Constant Pressure,work done is not zero.Here the heat transfer is due to change in
Enthalpy
State 2 define the constant volume process
State 3 define the constant pressure process
At P = 150 kPa and x = 1.0
Form the steam tables
h3 = 2694 kJ/kg
P3 = 150 kPa
u3 =u2 = 2520 kPa
Q2in = m*(u2-u1) = 1*(2520 - 2314) =206 kJ
Q3in = m*(h3-h1) = 1*(2694 - 2471) = 223 kJ
The difference is the work done in Const pressure process
W = 17 kJ
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