Cold water (cp = 4.1 8 kJ/kg · °C) leading to a shower enters a well-insulated thin-walled...

Cold water (cp = 4.1 8 kJ/kg · °C) leading to a shower enters a well-insulated thin-walled. double-pipe, counter-flow heat exchanger at 15°C at a rate of 0.25 kg/sand is heated to 45°C by hot water (cp= 4.19 kJ/kg . °C)that enters at 100°C at a rate of 3 kg/s. Determine (a) the rate of heat transfer and (b) the rate of entropy generation in the heat exchanger.