1009 Words5 Pages

Air delivered to the induction- manifold from the turbocharger is subjected to
reserve-flow pressure pulsation and turbulence, and results in considerable amount of heat.
Now engine power is dependent principally upon the mass of air drawn into the cylinder per
cycle, and increasing the charge pressure ratio alone will not permit the maximum quantity of
charge to enter the cylinder. In fact, the true measure of power potential is the density of the
charge in the cylinder and this relates directly to the temperature of the air charge about to
enter the cylinder. The lower the charge temperature at given constant pressure the smaller
will be its volume and hence more air charge is able to enter the cylinder. Heat –exchangers
of*…show more content…*

1 Operation of turbocharger and location of Charge Air Cooler There are two types of heat exchangers in common use. These are: 1. Air to liquid and 2. Air to air THERMODYNAMICS OF CHARGE AIR COOLING ratios for different compressor efficiencies are straightforward. Intake charge air densities shown in the fig are hard to obtain without charge air-cooling. The effect of charge air- cooling on density ratio is a function of the effectiveness of the charge air cooler and the pressure loss from compressor discharge to intake manifold. The effectiveness is defined as the ratio of temperature drop of charge air across the cooler to maximum temperature potential available for cooling. E = 12 T3: Intake manifold temperature T2: Compressor discharge temperature T1: Ambient temperature, which is assumed to be the same as compressor inlet temperature medium, above equation directly applies. In cases where water is used as intermediate cooling medium, the overall effectiveness is composed of the charge air cooling effectiveness and the corresponding radiator effectiveness. In either case, since the ultimate heat sink is the ambient air, equation is the reasonable measure of the system effectiveness. The pressure loss

1 Operation of turbocharger and location of Charge Air Cooler There are two types of heat exchangers in common use. These are: 1. Air to liquid and 2. Air to air THERMODYNAMICS OF CHARGE AIR COOLING ratios for different compressor efficiencies are straightforward. Intake charge air densities shown in the fig are hard to obtain without charge air-cooling. The effect of charge air- cooling on density ratio is a function of the effectiveness of the charge air cooler and the pressure loss from compressor discharge to intake manifold. The effectiveness is defined as the ratio of temperature drop of charge air across the cooler to maximum temperature potential available for cooling. E = 12 T3: Intake manifold temperature T2: Compressor discharge temperature T1: Ambient temperature, which is assumed to be the same as compressor inlet temperature medium, above equation directly applies. In cases where water is used as intermediate cooling medium, the overall effectiveness is composed of the charge air cooling effectiveness and the corresponding radiator effectiveness. In either case, since the ultimate heat sink is the ambient air, equation is the reasonable measure of the system effectiveness. The pressure loss

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