A power plant with a thermal efficiency of 40% is located on a river similar to the arrangement in Fig. P5.61. With a total river mass flow rate of 1 × 10⁵ kg/s at 15◦C, find the maximum power production allowed if the river water should not be heated more than 1 degree.

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Power plant Discharge 60 m Intake 8 m deep River mean speed 10m/minute FIGURE P5.61