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Problem 3 6 marks] Use the provided data tables for R134a to answer this problem. A closed vessel contains refrigerant-134a with a vapor fraction (kg vapor/kg total) of 0.9 at -10C. If the contents are heated to a temperature of 70°C, determine: a) The initial pressure in the vessel. b) The mass of R134a in the system c) The amount of heat added. d) The final pressure.
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Answer #1

thu Sihe ot temp -loc it contain beth phases, it muert be at satuated pe From Table, it is clear that at--lo.c-+-the- a pourqui-Noen-the-co natiturnho-ho ted-to-70°C aatio The mirture is still hoturated Hang. (156 3) (1-2) t 2802 χ IS 63 252 18 © 26

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Answer #2

thu Sihe ot temp -loc it contain beth phases, it muert be at satuated pe From Table, it is clear that at--lo.c-+-the- a pourqui-Noen-the-co natiturnho-ho ted-to-70°C aatio The mirture is still hoturated Hang. (156 3) (1-2) t 2802 χ IS 63 252 18 © 26

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