Inflight, the forward cargo compartment is heated by air drawn around it by the _____
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Madhur L.
A regenerative air refrigeration system is designed to take a load of 30 tons of refrigeration load of an aircraft cabin. The pressure of air is increased from 0.8 bar to 1.2 bar by ramming action. The air required for the refrigeration is bled from the main compressor at 4.8 bar. The effectiveness of the HE-I (when rammed air is used) is 0.6. The air coming out of HE-I is passed through the cooling turbine and some portion of the air coming out from the cooling turbine is used in HE-II (known as regenerative Heat Exchanger) where refrigeration air is cooled to 50°C. The temperature of the air coming out of HE-II is 100°C. The cabin is maintained at 1 bar and 25°C. The ambient temperature is 7°C. Assuming ramming is isotropic and ηc1 = 90% and ηt = 80%, find: (a) The percentage of the air extracted from the cooling turbine used in regenerative heat exchanger. (b) Power required to run the system. Assume that the power developed by the cooling turbine is used for running the ram air exhaust fan.
Sri K.
A jet transport aircraft cruises at $M=0.85$ at an altitude of $40,000 \mathrm{ft}$. Air for the cabin pressurization system is taken aboard through an inlet duct and slowed isentropically to 100 ft/s relative to the aircraft. Then it enters a compressor, where its pressure is raised adiabatically to provide a cabin pressure equivalent to $8000 \mathrm{ft}$ altitude. The air temperature increase across the compressor is $170^{\circ} \mathrm{F}$, Finally, the air is cooled to $70^{\circ} \mathrm{F}$ (in a heat exchanger with negligible friction) before it is added to the cabin air. Sketch a diagram of the system, labeling all components and numbering appropriate cross sections. Determine the stagnation and static temperature and pressure at each cross section. Sketch to scale and label a $T s$ diagram showing the static and stagnation state points and indicating the process paths. Evaluate the work added in the compressor and the energy rejected in the heat exchanger.
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