Pure water flows through a horizontal section of pipe that is 5 feet long and 1 inch in diameter. The water entering the pipe has a flow rate of 100 kg/min with a temperature of 100°C and pressure of 2 bar. The exiting water also has a flow rate of 100 kg/min and temperature of 100°C, but the pressure is 1.95 bar (Figure 1-23). The density of water at these conditions is 961.5 kg/m³. Determine the rate at which work is done, both at the pipe entrance and at the pipe exit.

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5 ft Water Water 100 kg/min Tin = 100°C Pin = 2 bar 100 kg/min Tout = 100°C Pout = 1.95 bar FIGURE 1-23 Water flowing through a pipe experiences a gradual pressure drop.