In a parallel flow heat exchanger, oil is cooled by water from 135°C to 65°C. The cold water has inlet and outlet temperature as 20°C and 50°C. Find: (i) exit temperature of fluds for counter-flow,...

In a parallel flow heat exchanger, oil is cooled by water from 135°C to 65°C. The cold water has inlet and outlet temperature as 20°C and 50°C. Find: (i) exit temperature of fluds for counter-flow, (ii) minimum outlet temperature of oil by increasing tube length in parallel-flow.