Cold water (c_p = 4.18 kJ/kg*C) leading to a shower enters a well-insulated, thin walled, double-pipe, counter-flow heat exchanger at 10 C at a rate of 0.95 kg/s and is heated to 70 C by hot water (c_p = 4.19 kJ/kg*C) that enters at 85 C at a rate of 1.6 kg/s. Determine the rate of entropy generation in the heat exchanger.