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1. Air expands through a nozzle from 75 to 15 psia. The enthalpy decreases by 48 Btu/lbm the flow is adiabatic and the inlet velocity is very low. Calculate the exit velocity. Ans: 1550 ft/s

1. Air expands through a nozzle from 75 to 15 psia. The enthalpy decreases by 48 Btu/lbm the flow is adiabatic and the inlet velocity is very low. Calculate the exit velocity. Ans: 1550 ft/s

Elements Of Electromagnetics
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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FIRST LAW OF THERMODYNAMICS CONSERVATION OF ENERGY – OPEN SYSTEM

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FIRST LAW OF THERMODYNAMICS CONSERVATION OF ENERGY – OPEN SYSTEM Answers are expressed in four significant digits. 1. Air expands through a nozzle from 75 to 15 psia. The enthalpy decreases by 48 Btu/lbm the flow is adiabatic and the inlet velocity is very low. Calculate the exit velocity. Ans: 1550 ft/s 2. The flow rate through a steam nozzle is 450 kg/h. The initial and final pressures are 1400 and 14 kPa. The initial and final velocities are 150 and 1200 m/s. There is no heat transfer. calculate the change in enthalpy. Ans: -708.8 kJ/kg 3. Steam expands adiabatically through a nozzle from 1400 to 14 kPa. The initial and final enthalpy values are 3300 and 2800 kJ/kg, respectively, and the initial velocity is very low. Determine the final velocity. Ans: 1000 m/s
Transcribed Image Text:FIRST LAW OF THERMODYNAMICS CONSERVATION OF ENERGY – OPEN SYSTEM Answers are expressed in four significant digits. 1. Air expands through a nozzle from 75 to 15 psia. The enthalpy decreases by 48 Btu/lbm the flow is adiabatic and the inlet velocity is very low. Calculate the exit velocity. Ans: 1550 ft/s 2. The flow rate through a steam nozzle is 450 kg/h. The initial and final pressures are 1400 and 14 kPa. The initial and final velocities are 150 and 1200 m/s. There is no heat transfer. calculate the change in enthalpy. Ans: -708.8 kJ/kg 3. Steam expands adiabatically through a nozzle from 1400 to 14 kPa. The initial and final enthalpy values are 3300 and 2800 kJ/kg, respectively, and the initial velocity is very low. Determine the final velocity. Ans: 1000 m/s
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