🧊 Cold Vault: Heat Load, Insulation, Refrigeration COP and a Power Cut (2D)

Cutaway of an underground cold vault for seeds and specimens, with concrete and insulation walls, door openings, lights and a refrigeration plant. Set the vault size, insulation thickness, temperatures, door traffic, internal load, plant efficiency and thermal mass, and see the cooling load, the plant COP, the yearly electricity and how many days the contents survive after a power cut. Wall conduction, the second law, the warm-up and the yearly sum are checked numerically, with four in-page numerical checks.