MAXIMUM HEAT EXCHANGER DUTY Q 2max, the maximum amount of heat that can be transferred in a heat exchanger, no matter how large it lS, occurs when the heating ana cooling curves eltner E Intersect at one end of the exchanger or the other or E Become tangent within the exchanger o For sensible heating with constant fluid heat capacities, the curves are straigh ght lines. They will intersect at that end of the exchanger whose entering fluid has the largest wCp, call it Wimax. /2499 Heat Exchanger desigr8/24/99 Heat Exchanger Design 9 MAXIMUM HEAT EXCHANGER DUTY u Qmax, the maximum amount of heat that can be transferred in a heat exchanger, no matter how large it is, occurs when the heating and cooling curves either ð Intersect at one end of the exchanger or the other or ð Become tangent within the exchanger u For sensible heating with constant fluid heat capacities, the curves are straight lines. They will intersect at that end of the exchanger whose entering fluid has the largest WCp, call it Wcpmax