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Cooling the tank in water would be easy. Most divers use aluminum tanks, because the typical aluminum scuba tank can be filled to 3000 psi, whereas the typical steel scuba tank is rated for 2400 psi. Aluminum has a much higher thermal conductivity (214 W/m K vs. 20 W/m K), and the tank wall is about 1.25 cm thick. Assuming nearly ideal mixing of the air inside the tank, and ideal heat exchange from the tank to the surrounding water, we could use Fourier's Law of heat conduction to estimate the rate of cooling.
Jeff Bigler
Lynn English HS; Lynn, MA USA