A pressure cooker 6 litres in volume contains 5 kg of water, where the liquid is in equilibrium with the vapour above it, at 30°C. The cooker with its lid closed and weight on, is heated until the vapour produced results in an increase in pressure, and the weight just lifts up at 2 bar. Calculate the heat transferred in the process. If the flame heating the cooker is at 400°C, calculate the entropy generation due to the external irreversibility. i. ii. Assume that the heating of water is reversible; neglect heating of the cooker body; assume heat transfer to water takes place at its average temperature for the above process. Use property data given below. T°C P kPa V; (m³/kg) Vfg (m³/kg) 32.8922 uf (kJ/kg) U (kJ/kg) 2290.81 30 4.246 0.001004 125.77 120.23 200 - 0.001061 0.884467 504.47 2025.02 T°C P kPa hr (kJ/kg) hig (kJ/kg) St (kJ/kg-K) Stg (kJ/kg-K) 30 4.246 125.77 2430.48 0.4369 8.0164 120.23 200 504.68 2201.96 1.5300 5.5970

A pressure cooker 6 litres in volume contains 5 kg of water, where the liquid is in equilibrium with the vapour above it, at 30°C. The cooker with its lid closed and weight on, is heated until the vapour produced results in an increase in pressure, and the weight just lifts up at 2 bar. Calculate the heat transferred in the process. If the flame heating the cooker is at 400°C, calculate the entropy generation due to the external irreversibility. i. ii. Assume that the heating of water is reversible; neglect heating of the cooker body; assume heat transfer to water takes place at its average temperature for the above process. Use property data given below. T°C P kPa V; (m³/kg) Vfg (m³/kg) 32.8922 uf (kJ/kg) U (kJ/kg) 2290.81 30 4.246 0.001004 125.77 120.23 200 - 0.001061 0.884467 504.47 2025.02 T°C P kPa hr (kJ/kg) hig (kJ/kg) St (kJ/kg-K) Stg (kJ/kg-K) 30 4.246 125.77 2430.48 0.4369 8.0164 120.23 200 504.68 2201.96 1.5300 5.5970

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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