a. Design a compressed air energy storage system for a wind turbine you analyzed previously. Assume that a cavity in an abandoned salt mine is available adjacent to the wind turbine. Use all the power above 5 kW to drive a compressor, which can compress ambient air. Assume that NG is available for heating the air entering the compressor.
b. Repeat part 1, but assume that the wind turbine is located near a landfill where low Btu gas can be obtained for free. Compare this option with the design in part a, where the gas has to be purchased at $5 per 1000 standard ft3.