File:C:\Users\PhotonUser\My Files\OneDrive\Files\Thermo_469.EES
11/3/2020 9:29:35 PM Page 1
EES Ver. 10.644: #4282: For use only by students and faculty, School of Engineering, University of St. Thomas, MN
1: "Inintial Conditions R134a"
2: T3 = 115 [F]
3: m3 = 1.5 [lb_m/s]
4: m4 = m3
5: m5 = m3
6: x3 = 0
7: p4 = 60 [psia]
8: p5 = p4
9: x5 = 1
10: W_hp = -0.2 [hp]
11: W = W_hp*convert(hp,Btu/s)
12:
13: "Initial Conditions Air"
14: T1 = 535 [R]
15: cp = 0.240 [Btu/lb_m*R]
16: T2 = 528 [R]
17:
18: "R134a Enthalpy"
19: h3 = enthalpy(R134a,T=T3,x=x3)
20: h4 = h3
21: h5 = enthalpy(R134a,x=x5,P=p5)
22: 0 = Q + m4*h4 - m5*h5
23:
24: "Air Enthalpy"
25: delta_h = cp*(T2-T1)
26:
27: "First Law"
28: 0 = Q - W +m1*(delta_h)
SOLUTION
Unit Settings: Eng F psia mass deg
cp = 0.24 [Btu/lbm*R]
h4 = 50.51 [Btu/lbm]
m3 = 1.5 [lbm/s]
p4 = 60 [psia]
T1 = 535 [R]
W = -0.1414 [Btu/s]
x5 = 1
No unit problems were detected.
dh = -1.68 [Btu/lbm]
h5 = 110.1 [Btu/lbm]
m4 = 1.5 [lbm/s]
p5 = 60 [psia]
T2 = 528 [R]
W hp = -0.2 [hp]
h3 = 50.51 [Btu/lbm]
m1 = 53.3 [lbm/s]
m5 = 1.5 [lbm/s]
Q = 89.4 [Btu/s]
T3 = 115 [F]
x3 = 0