We wish to determine whether less exergy is destroyed when we drive a car with all windows closed and the air conditioner on than when we drive with the windows open and the air conditioner off. The car can be modeled as a blunt body with frontal area \(A=5 \mathrm{~m}^{2}\) traveling through air with the velocity \(U_{\infty}\). It is known that in the flow regime of interest, the drag coefficients are \(C_{D}=0.47\) when the windows are closed and \(C_{D}=0.51\) with the windows open. The air conditioner consumes electrical power at a constant rate, \(W_{a c}=746 \mathrm{~W}\).

Try to show the velocity range in which one of the options is better than the other from an exergy destruction point of view.