Prof. Modyn proposes a multi-step, steady-state approach to cooling low-pressure steam before it's exhausted to the ambient. The steam enters a compressor at 1.50 kg/s, 0.100 MPa, and 285 °C where it is adiabatically compressed to 1.20 MPa requiring 2250 kW. The water is then feed to a well-insulated counter-current heat exchanger where it is isobarically cooled with air flowing at 1.18 kmol/s. The air enters the exchanger at 25.0 °C and leaves at 185 °C. Lastly, the water is fed to a well-insulated throttle valve where it is reduced back to 0.100 MPa forming a 2-phase product. Neglect changes in kinetic and potential energy. Assume air is an ideal gas with Ĉp [kJ/kmol-K] = 27.9 +4.78 x 10-³T with T' in K. Calculate the heat interaction term of the air, Qair (kW). Calculate the exiting enthalpy of the water, he water (kJ/kg). Calculate the mass flow rate of liquid water recovered in the process, mliq (kg/s). kW kJ/kg kg/s
Prof. Modyn proposes a multi-step, steady-state approach to cooling low-pressure steam before it's exhausted to the ambient. The steam enters a compressor at 1.50 kg/s, 0.100 MPa, and 285 °C where it is adiabatically compressed to 1.20 MPa requiring 2250 kW. The water is then feed to a well-insulated counter-current heat exchanger where it is isobarically cooled with air flowing at 1.18 kmol/s. The air enters the exchanger at 25.0 °C and leaves at 185 °C. Lastly, the water is fed to a well-insulated throttle valve where it is reduced back to 0.100 MPa forming a 2-phase product. Neglect changes in kinetic and potential energy. Assume air is an ideal gas with Ĉp [kJ/kmol-K] = 27.9 +4.78 x 10-³T with T' in K. Calculate the heat interaction term of the air, Qair (kW). Calculate the exiting enthalpy of the water, he water (kJ/kg). Calculate the mass flow rate of liquid water recovered in the process, mliq (kg/s). kW kJ/kg kg/s
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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![Prof. Modyn proposes a multi-step, steady-state approach to cooling low-pressure steam before it's exhausted to the ambient.
The steam enters a compressor at 1.50 kg/s, 0.100 MPa, and 285 °C where it is adiabatically compressed to 1.20 MPa requiring
2250 kW. The water is then feed to a well-insulated counter-current heat exchanger where it is isobarically cooled with air
flowing at 1.18 kmol/s. The air enters the exchanger at 25.0 °C and leaves at 185 °C. Lastly, the water is fed to a well-insulated
throttle valve where it is reduced back to 0.100 MPa forming a 2-phase product. Neglect changes in kinetic and potential
energy.
Assume air is an ideal gas with Ĉp [kJ/kmol-K] = 27.9 + 4.78 x 10³T with Tin K.
Calculate the heat interaction term of the air, Qair (kW).
Calculate the exiting enthalpy of the water, he water (kJ/kg).
Calculate the mass flow rate of liquid water recovered in the process, mug (kg/s).
kW
kJ/kg
kg/s](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc77f544a-ee3e-4902-8958-66e53c68e4a2%2Fe7159861-882a-432d-9e3d-bdfb08062e5a%2Fmjczqpn_processed.png&w=3840&q=75)
Transcribed Image Text:Prof. Modyn proposes a multi-step, steady-state approach to cooling low-pressure steam before it's exhausted to the ambient.
The steam enters a compressor at 1.50 kg/s, 0.100 MPa, and 285 °C where it is adiabatically compressed to 1.20 MPa requiring
2250 kW. The water is then feed to a well-insulated counter-current heat exchanger where it is isobarically cooled with air
flowing at 1.18 kmol/s. The air enters the exchanger at 25.0 °C and leaves at 185 °C. Lastly, the water is fed to a well-insulated
throttle valve where it is reduced back to 0.100 MPa forming a 2-phase product. Neglect changes in kinetic and potential
energy.
Assume air is an ideal gas with Ĉp [kJ/kmol-K] = 27.9 + 4.78 x 10³T with Tin K.
Calculate the heat interaction term of the air, Qair (kW).
Calculate the exiting enthalpy of the water, he water (kJ/kg).
Calculate the mass flow rate of liquid water recovered in the process, mug (kg/s).
kW
kJ/kg
kg/s
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