A regenerative air refrigeration system for an aeroplane is designed to take a load of 30 TR. The temperature and pressure conditions of the atmosphere are 5°C and 0.85 bar. The pressure of the air is increased from 0.85 bar to 1.2 bar due to ramming action. The pressure of air leaving the main compressor is 4.8 bar. 60% of the total heat of the air leaving the main compressor is removed in the heat exchanger and then it is passed through the cooling turbine. The temperature of the rammed air which is used for cooling purposes in the heat exchanger is reduced to 50°C by mixing the air coming out from the cooling turbine, and in the process, the cooling air from the turbine gets heated to 100°C before it is discharged. The isentropic efficiencies of the compressor and turbine are 90% and 80% respectively. The pressure and temperature required in the cabin are 1 bar and 25°C respectively. Assuming isentropic ramming and mass of cooled air passing through the heat exchanger equal to the mass of cooling air, find: 1. the ratio of by-passed air to ram air used for cooling purposes; and 2. the power required for maintaining the cabin at required condition. [Ans. 41.2%; 445 kW]
A regenerative air refrigeration system for an aeroplane is designed to take a load of 30 TR. The temperature and pressure conditions of the atmosphere are 5°C and 0.85 bar. The pressure of the air is increased from 0.85 bar to 1.2 bar due to ramming action. The pressure of air leaving the main compressor is 4.8 bar. 60% of the total heat of the air leaving the main compressor is removed in the heat exchanger and then it is passed through the cooling turbine. The temperature of the rammed air which is used for cooling purposes in the heat exchanger is reduced to 50°C by mixing the air coming out from the cooling turbine, and in the process, the cooling air from the turbine gets heated to 100°C before it is discharged. The isentropic efficiencies of the compressor and turbine are 90% and 80% respectively. The pressure and temperature required in the cabin are 1 bar and 25°C respectively. Assuming isentropic ramming and mass of cooled air passing through the heat exchanger equal to the mass of cooling air, find: 1. the ratio of by-passed air to ram air used for cooling purposes; and 2. the power required for maintaining the cabin at required condition. [Ans. 41.2%; 445 kW]
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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i am getting confused about this bypassed air. I think there should only be one line to flow with. Help me with this question
![9. A regenerative air refrigeration system for an aeroplane is designed to take a load of 30 TR. The
temperature and pressure conditions of the atmosphere are 5°C and 0.85 bar. The pressure of the air is
increased from 0.85 bar to 1.2 bar due to ramming action. The pressure of air leaving the main
compressor is 4.8 bar. 60% of the total heat of the air leaving the main compressor is removed in the
heat exchanger and then it is passed through the cooling turbine. The temperature of the rammed air
which is used for cooling purposes in the heat exchanger is reduced to 50°C by mixing the air coming
out from the cooling turbine, and in the process, the cooling air from the turbine gets heated to 100°C
before it is discharged. The isentropic efficiencies of the compressor and turbine are 90% and 80%
respectively. The pressure and temperature required in the cabin are 1 bar and 25°C respectively.
Assuming isentropic ramming and mass of cooled air passing through the heat exchanger equal to the
mass of cooling air, find: 1. the ratio of by-passed air to ram air used for cooling purposes; and
2. the power required for maintaining the cabin at required condition. [Ans. 41.2%; 445 kW ]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F30e70daa-6627-4415-802a-c19ac9cce4ae%2F8898c4d9-607f-4e72-b043-51140068bf2f%2Fqn9ytx_processed.png&w=3840&q=75)
Transcribed Image Text:9. A regenerative air refrigeration system for an aeroplane is designed to take a load of 30 TR. The
temperature and pressure conditions of the atmosphere are 5°C and 0.85 bar. The pressure of the air is
increased from 0.85 bar to 1.2 bar due to ramming action. The pressure of air leaving the main
compressor is 4.8 bar. 60% of the total heat of the air leaving the main compressor is removed in the
heat exchanger and then it is passed through the cooling turbine. The temperature of the rammed air
which is used for cooling purposes in the heat exchanger is reduced to 50°C by mixing the air coming
out from the cooling turbine, and in the process, the cooling air from the turbine gets heated to 100°C
before it is discharged. The isentropic efficiencies of the compressor and turbine are 90% and 80%
respectively. The pressure and temperature required in the cabin are 1 bar and 25°C respectively.
Assuming isentropic ramming and mass of cooled air passing through the heat exchanger equal to the
mass of cooling air, find: 1. the ratio of by-passed air to ram air used for cooling purposes; and
2. the power required for maintaining the cabin at required condition. [Ans. 41.2%; 445 kW ]
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