Question

A cooled, closed container holds Refrigerant 134a, initially at 0 °C and 59% quality. It has a safety valve that opens when the pressure inside reaches 5 bars. One night, the cooling system malfunctions, allowing the Refrigerant 134a to be heated until eventually the safety valve opens. What is the temperature of the Refrigerant 134a in the container when the valve first opens?

Answer 1

Initial condition (wet steam) Enthalpy, kJ/kg Entropy, kJ/kg-K Sat. Temp., press. T°C Psat kPa Specific volume, m3/kg Sat. Sat. liquid, vapor, VA VE Internal energy, kJ/kg Sat. Sat. liquid, Evap., vapor, Uf Ugg ug Sat. liquid, ht Evap., hig Sat. vapor, he Sat. liquid, SE Evap., Sfg Sat. vapor, Sg 0 293.01 0.0007722 0.069335 51.61 178.58 230.18 51.83 198.67 250.50 0.20432 0.72726 0.93158 The condition of Refrigerant at exit is 5 bar.(500 kPa) from steam table, the saturation temperature of refrigerant will be 15.7°C Internal energy, kJ/kg Enthalpy, kJ/kg Entropy, kJ/kg.K Specific volume, m3/kg Sat. Sat. liquid, vapor, Vi VE Sat. Press., Sat. Р temp., kPa Sat. Sat. liquid, ui Evap., Sat. liquid, hi Sat. vapor, vapor, ug Sat. vapor, ng Evap., Evap., hig liquid, Si Tsat °C Ufg Sfg 500 15.71 0.0008058 0.041168 72.92 165.86 238.77 73.32 186.04 259.36 0.28021 0.64399 0.92420 Sookla 293.01 kPa Sat 15.7 herd 2 can be Anywhere I oc

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