Question

2.1 (25%) On the P-h chart shown on the next page for R-134a clearly show the actual AND the ideal refrigeration cycles between the pressures 100kPa and 900kPa. The actual temperatures are shown in the table below; fill in the specific enthalpies. Note that the values for h and s are not compatible with the charts provided in the lab handout. Phdagram tor R134amtgerant 4MPa 300 C 10.9 3MPs 2MPa 1.0 1MPa 500kPa AuuLnEEALUa1 1.2 200kPa 20'C. Entropy JlkgK) 10% 20% 30 % 40% 50% 60% 709% o 90 100kPs plot by 60kPa 200 300 150 250 100 350 50 Enthelpy(kJkg Spec. enthalpy (k/kg) Measured State Temperature (deg C) 0 60 30 -20 5 anscaud

fill in the table

Answer 1

Solutia Sfeiihc Tenperaturel enthaly (ka 403.7 Meatured She O 1 443.12 2 30 3 - 20 387.6