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Abstract

A Thermal Storage Unit (TSU) including a Phase Change Material (PCM). and a nucleating temperature elevating nucleation agent in contact with the PCM. wherein the nucleation agent includes a Polyamide (PA) polymer. A method of freezing phase change fluid. the method including providing a phase change fluid. and cooling the phase change fluid until the phase change fluid nucleates, wherein the phase change fluid includes a mix of a phase change material (PCM) and a nucleation agent. and the nucleation agent includes a Polyamide (PA) polymer. A method of producing phase change fluid. the method including providing water. adding a Polyamide (PA) polymer material as a nucleation agent to the water, thereby producing an elevated nucleation temperature mixture with a nucleation temperature higher than the nucleation temperature of water without nucleation agent. Related apparatus and methods are also described.

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First Claim