In a parallel-flow, water-to-water heat exchanger, the hot water enters at 75ºC at a rate of 1.2 kg/s and cold water enters at 20ºC at a rate of 0.9 kg/s. The overall heat transfer coefficient and the surface area for this heat exchanger are 750 W/m2•ºC and 6.4 m2, respectively. The specific heat for both the hot and cold fluid may be taken to be 4.18 kJ/kg•ºC. For the same overall heat transfer coefficient and the surface area, the increase in the effectiveness of this heat exchanger if counter-flow arrangement is used is
(a) 0.09
(b) 0.11
(c) 0.14
(d) 0.17
(e) 0.19
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