Q1. In the production of skim milk powder, the milk is preheated, centrifuged to separate the cream, pasteurized and concentrated in a multiple effect evaporator. Following these processing steps, concentrated skim milk at a rate of 5000 kg/h with 50% moisture will be spray dried to 4% moisture in a spray dryer where the ambient air at 20C and 60% relative humidity is heated to 200C before entering the dryer. To reach the required final moisture content of the product, it is necessary to have the relative humidity of the air at the exit equal to 10%. (a)Draw the process flow diagram showing the steps involved in the production of skim milk powders. (5 marks) (b)Calculate the required air flow rate for the spray dryer. (5 marks) ()Determine the temperature of the air at the exit. (5 marks) (d)Calculate the heat required per kg of water evaporated. (5 marks)(e)Extra question for PG co-horts-: outline the necessary assumptions to support your answers. (5 marks)