Chiller or cool down rigs have been used in circle track racing for years - a common sight on practice days at NASCAR races
Here is a link to one from C&R that's for drag racing.
http://www.crracing.com/custom-built...ts/the-chiller
And for those interested - here is an example of a circle track version.
http://www.crracing.com/custom-built...iii-circulator