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Assignment 1 submitted via email within 29 Aug 12 mmeang@gmail.com

Assignment 1 submitted via email within 29 Aug 12 mmeang@gmail.com. W , 0.25 % TS. Feed 12 % TS. 120 kg/ min of product 45 % TS. B 30 % TS. R 1.5 % TS.

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Assignment 1 submitted via email within 29 Aug 12 mmeang@gmail.com

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  1. Assignment 1submitted via email within 29 Aug 12mmeang@gmail.com

  2. W , 0.25 % TS Feed 12 % TS 120 kg/ min of product 45 % TS B 30 % TS R 1.5 % TS Problem 1. A membrane separation system is used to concentrate the liquid food from 12 % to 45 % total solid (TS). The process is accomplished in two stages, in the first stage a low total solid liquid stream is released. For the second stage, there are two streams released. The first stream is final product with 45% TS and the others is coming out with 1.5% TS and recycled to the first stage. Determine the magnitude of the recycle stream, the waste stream from first stage contains 0.25 % TS and the stream between stages 1 and 2 contains 30 % TS . The flow rate of 45 % TS final product stream is at 120 kg/min. first stage Second stage

  3. Problem 2. Potato flakes ( 62 % w.b.) are being dried in a concurrent flow dries. The moisture content of the air entering the drier is 0.05 kg of water per 1 kg of dry air. The moisture content of air leaving the drier is 0.125 kg water per 1 kg of dry air. The air flow rate in the drier is 150 kg dried air per hour. As show in a picture , 80 kg of wet potato flakes enter the drier per hour. At steady state , Calculate the following A. What is the mass flow rate of dried patatoes.B. What is the moisture content , dry basis , of “ dried potatoes ” exiting the drier Air in Exit Air Feed Product

  4. Problem 3. How much saturated steam with 120.8 kPa pressure is required to heat 1000 g/h of juice from 58C to 95C? Assume that the heat capacity of the juice is 4 kJ/kgC. Problem 4. For quick preparation of a cup of hot chocolate in a cafeteria, cocoa powder and sugar are added in a cup of water and the solution is heated by direct steam injection. If the initial temperature of all the ingredients is 15 C, the final temperature is 95C, the mass of the solution is 150 g initially, and the heat capacity of the solution is 3.8 kJ/kg  C, calculate how much saturated steam at 110 C will be used. State your assumptions.

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