Calculate the fresh-air flow

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Reference no: EM133990687

Assignment:

The wet feed material to a continuous dryer contains 50 wt% on a wet basis and is dried to 27 wt% by countercurrent air flow. The dried product leaves at the rate of 907.2 kg/h. Fresh air to the system is at 25.6oC and has a humidity of H = 0.007 kg H2O/kg dry air. The moist air leaves the dryer at 37.8oC and H =0.020 and part of it is recirculated and mixed with the fresh air before entering a heater. The heated mixed air enters the dryer at 65.6oC and H= 0.010. The solid enters at 26.7oC and leaves at 26.7oC. Calculate the fresh-air flow, the percent air leaving the dryer that is recycled, the heat added in the heater, and the heat loss from the dryer.

Reference no: EM133990687

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