The rate of energy Trade through the stage change substance and the heat transfer fluid (or produce) is in correlation to the primary difference in enthalpy involving the two substances and also the surface place in which energy Trade can happen. A patented cold thermal energy storage technique from O-Hx https://purethermal.co.uk/media-news/pure-thermal-webinar-can-icebat-cold-thermal-energy-storage-provide-an-alternative-cooling-design-option/