File:(Untitled) 06/09/2024 08:33:51 Page 1
EES Ver. 9.944: #4402: EASY ENGINEERING, https://www.youtube.com/channel/UCjC8ulmve2QNRJXhDpk-L2A+
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"QUESTÃO 1-"
"Dados"
P7=1200[kPa]
P4=200[kPa]
P8=400[kPa]
P3=500[kPa]
x7=0
x3=0
x5=1
x1=1
m_dot_b=0,15 [kg/s]
eta_c=0,80
"Estado 1"
h1=Enthalpy(R134a;x=x1;P=P4)
s1=Entropy(R134a;x=x1;P=P4)
"Estado 2"
s2=s1
h2s=Enthalpy(R134a;s=s2;P=P3)
eta_c=(h2s-h1)/(h2-h1)
"Estado 3"
h3=Enthalpy(R134a;x=x3;P=P3)
s3=Entropy(R134a;x=x3;P=P3)
"Estado 4"
h4=h3
"Estado 5"
h5=Enthalpy(R134a;x=x5;P=P8)
s5=Entropy(R134a;x=x5;P=P8)
"Estado 6"
s6=s5
h6s=Enthalpy(R134a;s=s6;P=P7)
eta_c=(h6s-h5)/(h6-h5)
"Estado 7"
h7=Enthalpy(R134a;x=x7;P=P7)
"Estado 8"
h8=h7
"a)"
m_dot_a*(h8-h5)=m_dot_b*(h3-h2)
"b)"
QL=m_dot_b*(h4-h1)
"c)"
w_dot_c=m_dot_a*(h5-h6)+m_dot_b*(h1-h2)
COP_R=QL/w_dot_c
SOLUTION
Unit Settings: SI C kPa kJ mass deg
COPR = 2,683 [kJ/s] hc = 0,8 [kJ/kg] h1 = 244,5 [kJ/kg]
h2 = 268 [kJ/kg] h2s = 263,3 [kJ/kg] h3 = 73,33 [kJ/kg]
h4 = 73,33 [kJ/kg] h5 = 255,6 [kJ/kg] h6 = 284 [kJ/kg]
h6s = 278,3 [kJ/kg] h7 = 117,8 [kJ/kg] h8 = 117,8 [kJ/kg]
ma = 0,2119 mb = 0,15 [kg/s] P3 = 500 [kPa]
