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Problem 1. (9 pts) Steam at an absolute pressure of 3 bar is used to blanch 450kgh1 of beans (blanching means heating with steam and
Problem 1. (9 pts) Steam at an absolute pressure of 3 bar is used to blanch 450kgh1 of beans (blanching means heating with steam and water) with an equal mass flow of water in a continuous process. The beans enter at 20C and beans, water and condensate are all discharged at 88C. Assuming that the moisture content of the beans remains unchanged and that heat losses from the process amount to 38kW. Assume that the mean heat capacity of beans is 3.75kkg1K1. Cp water at 25C=4.2kJkg1K1 a. Develop a flow diagram of the process.(1 pt) b. Deternine the steam flow rate required for the process. (5pts) c. Determine the percentage heat loss in the process. (3pts) For saturated steam at 3 bar (Tst=133C) hz=2725kJ/kghf=561kJ/kg Problem 1. (9 pts) Steam at an absolute pressure of 3 bar is used to blanch 450kgh1 of beans (blanching means heating with steam and water) with an equal mass flow of water in a continuous process. The beans enter at 20C and beans, water and condensate are all discharged at 88C. Assuming that the moisture content of the beans remains unchanged and that heat losses from the process amount to 38kW. Assume that the mean heat capacity of beans is 3.75kkg1K1. Cp water at 25C=4.2kJkg1K1 a. Develop a flow diagram of the process.(1 pt) b. Deternine the steam flow rate required for the process. (5pts) c. Determine the percentage heat loss in the process. (3pts) For saturated steam at 3 bar (Tst=133C) hz=2725kJ/kghf=561kJ/kg
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