The exit temp ( in oC) for the cold fluid is

Question

In a parallel flow heat exchanger operating under steady state, the heat capacity rates of the hot and cold fluids are equal. The hot fluid flowing at 1Kg/sec with sp. Heat 4 kJ/kgK, enters the heat exchanger at 102⁰C while the cold fluid has an inlet temp of 15⁰C. the OHTC of the heat exchanger is estimated to be 1 kW/m²K and the corresponding heat transfer surface area is 5m². Neglecting heat transfer between the heat exchanger and the ambient.

The heat exchanger is characterized by the following relation 2e = 1 – Exp (–2NTU)

The exit temp ( in ⁰C) for the cold fluid is

      (a) 45                              (b) 55                           (c) 65                              (d) 75