Question

3. In a shell-and-tube heat exchanger, under nominal condition a process stream (a liquid) is heated from 100°C to 200°C without any phase change using a heating medium in the tube side, temperature of which gets reduced from 300°C to 150°C. The process side has a bypass which remains closed under nominal condition. Under nominal condition, there are equal resistances to heat transfer on shell and tube sides. It is desired that the process stream flowrate be increased by 30%, but it is desired that the process side pressure drop ncreases by only 44%. So the remaining portion of the inlet process stream for the desired scale up is bypassed and then mixed with the stream exiting the heat exchanger What is the temperature of the process stream just at the outlet of the exchanger (i.e before itmixes with the bypass) if the flowrate of the heating medium remains unchanged? Considering turbulent flow condition, assume that the pressure drop in the process side is proportional to the square of its mass flowrate, i.e. - AP m

Answer 1

ausune ceuute Cuaant fou Cond CPIECP2 300 ma co-) mh (1s0) - me Xlo O 1Smazme peecfle22ate asy 30% १.২ 1-3 mh =mh and paecas side pacsuredaep incaase by 44% 2+ 1-44AP mc2 me .2 me m(300-150 mc' r-lo०) (Tea-le 1.mhxs0 1-2x 1sh Tea-10) Ta 20s.32 1-3mh xIso 1.2me heve outlet enp aeecis side o aos-23e A