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What are the advantages of compound compression system with intercooler over single stage compression ?

saurabhjain

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What are the advantages of compound compression system with intercooler over single stage compression ?

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The higher the temperature the harder it is to compress air in smaller volume or in other words the more energy you need to do it. So - lower temperature, smaller amount of energy, higher temperature, larger amount of energy. So once you compress it on stage one, its temperature increases due to molecular collisions in the small volume, if you take away energy in the form of heat, its temperature will fall and now you can again compress it with significant savings of energy because the decrease in temperature has reduced molecular movement inside the small volume making it possible to compress them with smaller amount of energy. So in the end it results with increased effectiveness. This type of system can also be used to take away water vapor from the air that's being compressed, because as you compress the air and you reduce its temperature some of the water vapor inside will condense and fall down in the form of drops. 

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It leads to less compression work to second stage of compression, as at first compression temp goes up and pressure develops to get more compressed pressure at output it must intercooled. As pressure increases temp increses so, to avoid higher temp at output it must intercooled

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