A solution with an initial solid concentration of 8% is fed to a single-effect evaporator at 53 C at a rate of 1350 kg hr. The evaporator is operating at 58.6 kPa (0.58 bar) and produces a product with final solid concentration of 35%. Saturated steam at a pressure of 101.3 kPa (1.0 bar) is used to concentrate the liquor. If the specific heat capacity of the feed is 4.5 kJ kg C and that of the product is 5.24 kJ kg C, assuming negligible boiling point risc, determine the steam economy of this evaporator. Refer to the attached Steam table (Appendix 3). T If a double-effect evaporator was used and in the first effect, A1 - UAT, and in the second effect A2-UAT. Consider a single-effect evaporator. working under the same pressure as the first effect, q. = U,A,AT, where subscript 's indicates the single-effect evaporator and Up - U - 0. and A-A. Find A, for the single-effect evaporator that will evaporate the same quantity as the two effects. What conclusion can be drawn from this analysis?

A solution with an initial solid concentration of 8% is fed to a single-effeet evaporator at 53C at a rate of 1350kghr1. The evaporator is operating at 58.6kPa(0.58 bar ) and produces a product with final solid concentration of 35%. Saturated steam at a pressure of 101.3kPa (1.0 bar) is used to concentrate the liquor. If the specific heat capacity of the teed is 4.5kJkgtC1 and that of the product is 5.24kJkg1C1, assuming negligible boiling point risc, determine the steam cconomy of this evaporator. Refer to the attached Steam table (Appendix 3). If a double-effect evaporator was used and in the first effect, q:U1A1Ti and in the second effect, q2=U2A2T2. Consider a single-effect svaporator. working under the same pressure as the first effeet, q,UsAsTs where subscript 's' indicates the single-cffect evaporator and U1=U2=Us. and A1=A2 Find As for the single-effect cvaporator that will evaporate the same quantity as the two eftects. What conclusion can be drawn from this analysis