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Paper is being dried with recirculating air in a two stagedrying system operating at 1 atm The air enters the first dryer at180"F where the air is adiabatically saturated with moisture Theair is

Paper is being dried with recirculating air in a two-stagedrying system operating at 1 atm. The air enters the first dryer at180"F, where the air is adiabatically saturated with moisture. Theair is then reheated in a heat exchanger to 174°F before entering thesecond dryer, where the air is adiabatically humidified to 80% rela-tive humidity. The air is then cooled to 60°F in a second heatexchanger, causing some of the moisture to be condensed. This isfollowed by a third heater to heat the air to 1 80°F before it returnsto the first dryer.(a) Draw a process-flow diagram of the system and enter all of thegiven data.(b) Determine the lb H20 evaporated in each dryer per lb of dry airbeing circulated.(c) Determine the lb H20 condensed in the second heat exchangerper lb of dry air circulated

 

Jul 22 2020 View more View Less

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