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A pharmaceutical crystalline material containing 15% by weight H2O must be dried to 7% H2O in a recycle air dryer. The fresh air contains 0.01 kg H2O/kg dry air and the air leaving the dryer contains 0.1 kg H2O kg/kg dry air. The air entering the dryer contains 0.03 kg H2O/kg dry air. a) Draw a schematic diagram of the process. [2 marks] b) Calculate the weight of water removed and the weight of fresh air supplied per 10 kg of wet feed [4 marks] c) Calculate the weight of recycled air per 10 kg wet feed. [2 marks] d) What is the aim of the recycle? Briefly explain.
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![A pharmaceutical crystalline material containing 15% by weight H2O must be dried to 7% H2O in a recycle air dryer. The fresh air contains 0.01 kg H2O/kg dry air and the air leaving the dryer contains 0.1 kg H2O kg/kg dry air. The air entering the dryer contains 0.03 kg H2O/kg dry air. a) Draw a schematic diagram of the process. [2 marks] b) Calculate the weight of water removed and the weight of fresh air supplied per 10 kg of wet feed [4 marks] c) Calculate the weight of recycled air per 10 kg wet feed. [2 marks] d) What is the aim of the recycle? Briefly explain.](https://numengineering.com/wp-content/uploads/2024/12/Screenshot-2024-12-09-164906.png)
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