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Assignmnet 5

# Assignmnet 5 - 12-14 The validity of the last Maxwell...

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12-14 The validity of the last Maxwell relation for refrigerant-134a at a specified state is to be verified. Analysis We do not have exact analytical property relations for refrigerant-134a, and thus we need to replace the differential quantities in the last Maxwell relation with the corresponding finite quantities. Using property values from the tables about the specified state, ( 29 ( 29 K /kg m 10 1.0095 K /kg m 10 1.005 C 60) (100 /kg m 0.018404) (0.022442 kPa 1000) (1400 K kJ/kg 1.0458) (1.0056 C 60 100 kPa 1000 1400 3 4 3 4 3 ? kPa 1200 C 60 C 100 ? C 80 kPa 1000 kPa 1400 kPa 1200 ? C 80 ? × - 2245 × - ° - - - 2245 - - ° - - - 2245 - - - 2245 - = - - = ° ° ° = = ° = P T P T P T s s T P s T P s v v v v since kJ kPa·m³, and K ° C for temperature differences. Thus the last Maxwell relation is satisfied. 12-17 Using the Maxwell relations, a relation for (
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