The maximum power a windmill can possibly extract from the wind isWater flowing through Ho...

The maximum power a windmill can possibly extract from the wind is

Water flowing through Hoover Dam (see Problem 4.47) produces ˙W = 0.8ṁ water gh. Burning 1 kg of coal gives 24 000 kJ delivered at 900 K to a heat engine. Find other examples in the literature and from problems in the previous chapters with steam and gases into turbines. List the availability (exergy) for a flow of 1 kg/s of substance with the above examples. Use a reasonable choice for the values of the parameters and do the necessary analysis.

Problem 4.47

Turbines, Expanders

Hoover Dam across the Colorado River dams up Lake Mead 200mhigher than the river downstream (see Fig. P6.47). The electric generators driven by water-powered turbines deliver 1300MWof power. If the water is 17.5°C, find the minimum amount of water running through the turbines.

FIGURE P6.47