A spray dryer is fed with 200kg/h of coffee extract containing 25% solids at 38oC. Air at 280⁰C and 0.02kg water/kg dry air is used to dry the extract. The product comes out of the dryer with 3% moisture at 80⁰C. The exit air temperature is 100⁰C. Calculate the amount of air required and moisture content of exit air. Specific heats: Dry air= 1.005 kJ/kg⁰C vapour= 1.88 kJ/kg⁰C solids= 1.254 kJ/kg⁰C water= 4.18 kJ/kg⁰C

Question-Answer › Category: Food Engineering › A spray dryer is fed with 200kg/h of coffee extract containing 25% solids at 38oC. Air at 280⁰C and 0.02kg water/kg dry air is used to dry the extract. The product comes out of the dryer with 3% moisture at 80⁰C. The exit air temperature is 100⁰C. Calculate the amount of air required and moisture content of exit air. Specific heats: Dry air= 1.005 kJ/kg⁰C vapour= 1.88 kJ/kg⁰C solids= 1.254 kJ/kg⁰C water= 4.18 kJ/kg⁰C

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Sumit kumar asked 1 year ago

A spray dryer is fed with 200kg/h of coffee extract containing 25%
solids at 38oC. Air at 280⁰C and 0.02kg water/kg dry air is used to dry
the extract. The product comes out of the dryer with 3% moisture at
80⁰C. The exit air temperature is 100⁰C. Calculate the amount of air
required and moisture content of exit air.
Specific heats:
Dry air= 1.005 kJ/kg⁰C
vapour= 1.88 kJ/kg⁰C
solids= 1.254 kJ/kg⁰C
water= 4.18 kJ/kg⁰C

Question Tags: Food technology