Volume of tube cooler

I have a cooler with 148 , 1inch gauge 14 tubes. Its 10 ft long. It has 2 headers 5.5in x 6in x 10ft long. Is there a simple way to check how much bottles of 2200psi nitrogen botles i would need to leak test it? I dont know if there is a clever way to calc the volume but i did it the long route. But im still unsure how the N2 would compress the air. Im also concerned about wasting n2 by having the bank just leveling out at a low pressure. Idk if that is a valid concern tho.