In a turbocharger, exhaust gases(air)enter the turbine at 400oCand 120 kPa at a rate of 0.02 kg/s and leave at 350oC. Airenters the compressor at 50oC and 100 kPa and leaves at130 kPa at a rate of 0.018 kg/s. The compressor increasesthe air pressure with a side effect: It also increases the airtemperature, which increases the possibility of a gasolineengine to experience autoignition. To avoid this, an aftercooleris placed after the compressor to cool the warm air bycold ambient air before it enters the engine cylinders. It isestimated that the aftercooler must decrease the air temperaturebelow 80oC if knock is to be avoided. The cold ambientair enters the aftercooler at 30oC and leaves at 40oC. Treating the exhaust gases as air, determine (a) thetemperature of the air at the compressor outlet and (b) theminimum volume flow rate of ambientair required to cool the compressed air to 80oC.
In a turbocharger, exhaust gases(air)enter the turbine at 400oCand 120 kPa at a rate of 0.02 kg/s and leave at 350oC. Airenters the compressor at 50oC and 100 kPa and leaves at130 kPa at a rate of 0.018 kg/s. The compressor increasesthe air pressure with a side effect: It also increases the airtemperature, which increases the possibility of a gasolineengine to experience autoignition. To avoid this, an aftercooleris placed after the compressor to cool the warm air bycold ambient air before it enters the engine cylinders. It isestimated that the aftercooler must decrease the air temperaturebelow 80oC if knock is to be avoided. The cold ambientair enters the aftercooler at 30oC and leaves at 40oC. Treating the exhaust gases as air, determine (a) thetemperature of the air at the compressor outlet and (b) theminimum volume flow rate of ambientair required to cool the compressed air to 80oC.
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