i think there's a lot of things to consider that may cause problems here.
if nothing else, if you're doing these "burstings", how hard is this going to be on your hot pc components when they're blasted suddenly to below freezing?
secondly, i think it would be a much better system in a closed loop, with some sort of reclamation system. but then you're getting to the point where you just as well go phase change or whatever and use refrigerant, since you'd need a compressor and such anyways
