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Metal nitrate based compositions for use as phase change materials

A technology of metal nitrate and hydrate, which is applied in the field of metal nitrate hydrate, and can solve problems such as inappropriate application

Pending Publication Date: 2021-06-01
松耐普有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Another problem is the range of different melting and crystallization temperatures exhibited by metal nitrate hydrates, which is wide and may be at the point where it is not suitable for certain applications

Method used

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  • Metal nitrate based compositions for use as phase change materials
  • Metal nitrate based compositions for use as phase change materials
  • Metal nitrate based compositions for use as phase change materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0137] figure 1 An illustration of a bag, generally designated 10, filled with calcium tetrahydrate and having a bendable metal disc 12 located therein is depicted. The bendable metal disc 12 has a number of surface grooves.

[0138] In such a system, after heat sealing, remelting and allowing the pouch to cool to room temperature, crystallization can be achieved by bending the metal disk 12, creating nucleation centers in the vicinity of the metal disk 12, as figure 2 shown in .

[0139] Thermal releases can be tracked using thermal imaging cameras, such as image 3 with Figure 4 shown in .

[0140] exist image 3 In , calcium nitrate tetrahydrate (Ca(NO 3 ) 2 4H 2 O) nucleation. In the region where crystals formed, the temperature rose to 42.3°C.

[0141] exist image 3 , the temperature had risen to 42.8°C to 42.9°C by the time the pouches were fully crystallized.

[0142] The present inventors have discovered that the contents of the bag can be remelted sever...

Embodiment 2

[0144] Strontium nitrate is readily available in anhydrous form, and the tetrahydrate can be formed from water by recrystallization of a saturated solution at low temperatures.

[0145] Addition of strontium nitrate tetrahydrate to a vial of supercooled calcium nitrate tetrahydrate did not cause crystallization.

[0146] Figure 5 A vial 20 of molten salt containing two strontium nitrate tetrahydrate crystals (circled) is shown. It can be clearly seen that no crystallization has occurred.

[0147] However, it was found that the addition of magnesium nitrate hexahydrate to this mixture of calcium nitrate tetrahydrate and strontium nitrate tetrahydrate crystals caused the nucleation of calcium nitrate tetrahydrate.

[0148] Image 6 A comparison is shown of vials containing calcium nitrate tetrahydrate and each individual nucleating agent, and vials containing both nucleating agents at temperatures below the freezing transition temperature of calcium nitrate tetrahydrate. Vi...

Embodiment 3

[0153] An amount of calcium carbonate was added to the nitric acid solution such that a molar ratio of calcium ions to nitrate ions of about 1:2 was achieved. The concentration of the nitric acid solution is chosen such that the total water content in the final mixture matches the composition of calcium nitrate tetrahydrate (about 30% by weight water), taking into account the neutralized water produced by the reaction. A certain amount of anhydrous strontium nitrate and water in an amount of about 4 equivalents to the strontium nitrate were then added under stirring. A quantity of commercially available magnesium nitrate hexahydrate was then added to provide the final PCM composition.

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PUM

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Abstract

There is disclosed herein metal nitrate hydrates as phase change materials (PCMs). More particularly, there is disclosed herein metal nitrate hydrate PCMs containing group II metal nitrates as nucleation agents. A further disclosure herein is the combination of multiple chemical species in the PCM formulation which act together to induce nucleation of metal nitrate PCMs. Furthermore, physical mechanisms by which nucleation of metal nitrate hydrate based PCMs and crystallisation rate increased are disclosed.

Description

technical field [0001] The present invention relates to metal nitrate hydrates as phase-change materials (PCMs). More specifically, the present invention relates to metal nitrate hydrates as PCMs with additives to overcome sub-cooling. Background technique [0002] Latent heat storage utilizes first-order phase transitions (solid to solid, solid to liquid, liquid to gas) to store thermal energy. On first heating, the material will exhibit sensible heat storage: as heat is absorbed, the temperature will rise according to the specific heat capacity of the material. Then, the temperature remains constant at a certain point as thermal energy is absorbed due to the phase transition taking place. Once the phase change has occurred, the temperature will rise again as sensible heat storage occurs in the new phase. An advantage over sensible heat storage is that a similar or greater amount of heat can be stored over a much smaller temperature range and in a smaller volume. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063Y02E60/14C01F11/36C01F5/38
Inventor 安德鲁·约翰·比塞尔大卫·奥利弗科林·理查德·普勒姆艾米丽·简·戈达德吉伦·奥德林凯特·费希尔
Owner 松耐普有限公司
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