2. An 80L vesselcontains 4kg of refrigirant 134a at the pressure of 140 kPa.Dete

Question

2. An 80L vesselcontains 4kg of refrigirant 134a at the pressure of 140 kPa.Determine a) The temperature b) The quality c) The enthalpy of the refrigirant d) The volume occupied by the vapor phase 2. An 80L vesselcontains 4kg of refrigirant 134a at the pressure of 140 kPa.Determine a) The temperature b) The quality c) The enthalpy of the refrigirant d) The volume occupied by the vapor phase a) The temperature b) The quality c) The enthalpy of the refrigirant d) The volume occupied by the vapor phase

Explanation / Answer

given volume=80L=0.08m3 mass m=4kg pressure p=140kPa specific volume v=V/m                          =0.08/4                          =0.02m3/kg at p=140kPa from steam tables vf=0.7381*10-3m3/kg vg=0.1395m3/kg b)we know v=vf+xvfg               0.02=0.7381*10-3+x*(0.1395-0.7381*10-3)                  x=0.1388 dryness fraction x=0.1388 a) the temperature is saturation temperature at p=140kPa T=-18.80C a) the temperature is saturation temperature at p=140kPa T=-18.80C c)enthalpy h=hf+xhfg     you take hf andhfg values from tables h=25.77+0.1388*210.27 h=54.955kJ/kg d) the specific volume occupied by the vapor phase isvg=0.1395m3/kg volumeoccupied by the vapor phase is  Vg=m*vg                                                                  =4*0.1395                                                             Vg=0.558m3                                                                  =4*0.1395                                                             Vg=0.558m3

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.