EF 20-1

A counterflow double pipe heat exchanger is used to cool oil from a large engine. Oil at a flow rate of 0.82 kg/s is required to be cooled from 95C to 90C using water at a flow rate of 1.2 kg/s and at 25C. A 7 m long carbon steel fork will be used. Internal and external tubes are 1 and 2-inch nominal schedule NPS 40, respectively. Engine oil flows through the inner tube. The heat exchanger is not initially in service with the forks, a) The exchanged heat- (01 pt) b) Which solution method will you use, the NTU or LMTD? Why? (01 pt) c) Estimate the global transfer coefficient. (04 pt) d) How many forks will be needed? (01 pt

Please explain the equations and procedure thank you.

K_acero =56.4w/mk Oil: w=0.0714N.s/m2