Question No$.01$:

a$)$ Briefly explain the main difference between the LMTD method and the effectivenessNTU method in heat exchanger analysis.

b$)$ Under what conditions would you prefer to use the effectiveness$-$NTU method instead of the LMTD method? Justify your answer.

c$)$ A heat exchanger is operating, but its outlet temperatures are not known. Which method $($LMTD or effectiveness$-$NTU$)$ is more suitable for analyzing the heat exchanger performance? Explain why.