Depending upon the relative direction of fluid motion, shell-and-tube heat exchangers areclassified as parallel flow, counter flow, cross flow. In parallel flow, the hot and cold fluids flowin the same direction and therefore enter the exchanger on the same end and exit the exchangeron the same end. In counter flow, the two fluids flow in opposite directions and thus enter theexchanger and exit the exchanger from opposite ends. Cross flow heat exchangers will not beanalyzed as a part of this laboratory experimen