Example 3.13. A regenerative air cooling system is used for an air plane to take 20 tonnes of refrigeration load. The ambient air at pressure 0.8 bar and temperature 10°C is rammed isentropically till the pressure rises to 1.2 bar. The air bled off the main compressor at 4.5 bar is cooled by the ram air in the heat exchanger whose effectiveness is 60%. The air from the heat exchanger is further cooled to 60°C in the regenerative heat exchanger with a portion of the air bled after expansion in the cooling turbine. The cabin is to be maintained at a temperature of 25°C and a pressure of 1 bar. If the isentropic efficiencies of the compressor and turbine are 90% and 80% respectively, find :

Example 3.13. A regenerative air cooling system is used for an air plane to take 20 tonnes of refrigeration load. The ambient air at pressure 0.8 bar and temperature 10°C is rammed isentropically till the pressure rises to 1.2 bar. The air bled off the main compressor at 4.5 bar is cooled by the ram air in the heat exchanger whose effectiveness is 60%. The air from the heat exchanger is further cooled to 60°C in the regenerative heat exchanger with a portion of the air bled after expansion in the cooling turbine. The cabin is to be maintained at a temperature of 25°C and a pressure of 1 bar. If the isentropic efficiencies of the compressor and turbine are 90% and 80% respectively, find :

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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Question

Example 3.13. A regenerative air cooling system is used for an air plane to take 20 tonnes
of refrigeration load. The ambient air at pressure 0.8 bar and temperature 10°C is rammed
isentropically til the pressure rises to 1.2 bar. The air bled off the main compressor at 4.5 bar is
cooled by the ram air in the heat exchanger whose effectiveness is 60%. The air from the heat
exchanger is further cooled to 60°C in the regenerative heat exchanger with a portion of the air
bled after expansion in the cooling turbine. The cabin is to be maintained at a temperature of
25°C and a pressure of 1 bar. If the isentropic efficiencies of the compressor and turbine are 90%
and 80% respectively, find :

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