You might want to consider shades.
http://www.blindsgalore.com/category...oogle%A0%A0%A0
Air conditioning the hot lanai I used a Mr. Slim.
http://www.mrslim.com/Products/Categ...tCategoryID=24
But bottom line Air Conditioning an Acrylic windowed Lani where the roof is not insulated and Acrylic Windows are Fair at best is not a very good idea if you plan to do it 24/7.
I have not heard of anyone who had success when running vents.
Good luck