Air is compressed in a compressor from 30 C , 60% relative humidity , and 101kPa to 414kPa and then cooled in an intercooler before entering a second stage of compression. What is the minimum temperature to which the air can be cooled so that condensation does not take place?

Wet coal amounting to 10000 ton/day is dried in an air dryer .The wet coal feed enters with 24% by mass of water and exits with 4%.The hot air used to dry the wet coal is fed at 40°C dry‐bulb temperature ,and 16°C wet‐bulb temperature .The moist air exits the dryer with 40% RH at 30°C. Calculate the amount of dry air atm 4/h at STP. Use psychrometric chart

For an entropy value of O kJ/kg-K what would be the value of the corresponding enthalpy?

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