... (kg/s) 60 62 64 66 68 70Exchanger length, L (m)PROBLEM 11.20KNOWN: Counterflow concentric tube heat exchanger.FIND: (a) Total heat transfer rate and outlet temperature of the water and (b) ... is() 66 hfgqmh1.5kg/s2.30410J/kg3. 461 0W==×=×& and the corresponding heat capacity rate for the water is() 6 cminc,oc,iCCq/TT3. 461 0W/40K 86, 400W/K.==−=×=Hence, ()( ) 6 minh,ic,iq/CTT3. 461 0W/ 86, 400W/K65K0 .62 .ε=−=×=Since ... developed; (c) Compute and plot the heat transfer rate, q, and fluid inlet temperatures, Th,o and Tc,o,as a function of the tube length for 60 ≤ L ≤ 400 m with the PF arrangement and overall coefficientUWmK=⋅2002!&,...