Refrigerant pellets could be transferred like grain or wood pellets. Augurs, conveyors, or pneumatic. If you could get it to solidify into a powder or partial

Refrigerant pellets could be transferred like grain or wood pellets. Augurs, conveyors, or pneumatic. If you could get it to solidify into a powder or partially solidify you could come up with alternatives, but you'd get in trouble with frozen lines.