Density stabilized phase change material
AssigneeModine Manufacturing Company
InventorsDavid John Czarnecki, James A. Robinson
Life of this patent
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Abstract
A phase change material for use in a heat battery is provided which includes a salt of hydrated Group IIA metal nitrate and Group IA metal nitrate and an effective amount of an aqueous material sufficient to cause the densities of the liquid and solid phases of said phase change material to be approximately equal during phase transformation. A method of making the phase change material and a heat battery which contains the phase change material are also provided.
Claims20
A phase change material including:
- a salt of an effective amount of hydrated Group IIA metal nitrate and an effective amount of Group IA metal nitrate that may exist in liquid and solid phases;
- and
- an effective amount of an aqueous material sufficient to cause the densities of the liquid and solid phases of said phase change material to be approximately equal during phase transformation.
A method of making a density stabilized phase change material, including the steps of:
- providing a salt of an effective amount of hydrated Group IIA metal nitrate and an effective amount of Group IA metal nitrate that may exist in solid and liquid phases;
- and
- adding an effective amount of an aqueous material sufficient to cause the densities of the liquid and solid phases of said phase change material to be approximately equal during phase transformation.
A heat battery comprising:
- a passage through which a working fluid may pass;
- a container in heat exchange relationship with the passage;
- and
- a density stabilized phase change material capable of existing in liquid and solid phases disposed in the container, the phase change material comprising a salt of an effective amount of a hydrated Group IIA metal nitrate and an effective amount of a Group IA metal nitrate and an effective amount of aqueous material,
- wherein the density of the phase change material in the solid phase is approximately equal during phase transformation to the density of the phase change material in the liquid phase.
Dependencies are inferred from the claim text.