CN103666381A - Phase-change energy-storage material - Google Patents
Phase-change energy-storage material Download PDFInfo
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- CN103666381A CN103666381A CN201310681548.2A CN201310681548A CN103666381A CN 103666381 A CN103666381 A CN 103666381A CN 201310681548 A CN201310681548 A CN 201310681548A CN 103666381 A CN103666381 A CN 103666381A
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Abstract
The invention relates to a phase-change energy-storage material which comprises the following components in percentage by mass: 75%-99% of an energy storage main body material, 0.1%-10% of a thickening agent, 0.2%-15% of a nucleating agent and 0.01%-8% of a reinforcing material, wherein the energy storage main body material comprises crystal water and salt; the thickening agent comprises one or more of an inorganic thickening agent, fibers, polyacrylates, polyurethanes and a natural polymer thickening agent; the nucleating agent comprises one or more of sodium pyrophosphate, sodium phosphate decahydrate, calcium sulfate dihydrate, potassium sulfate, potassium borate, barium hydroxide octahydrate, sodium phosphate dibasic dodecahydrate and sodium sulfate; the reinforcing material comprises one or more of metal and metal oxide powder, carbon materials, nanoparticles and foam materials. By selecting proper materials and ratio, the supercooling degree and the phase separation phenomenon are reduced and good circulating stability is achieved; especially the reinforcing material is added into a system to form a heat-conducting network so as to improve the heat conductivity of the material by more than two times.
Description
[technical field]
The present invention relates to energy storage material technical field, specifically a kind of phase-changing energy storage material.
[background technology]
Along with becoming increasingly conspicuous of energy shortage and problem of environmental pollution, utilize the utilization ratio of new forms of energy, the raising energy to be more and more subject to people's attention.Energy storage technologies, the important method as solving Power supply-demand unbalance, enjoys the favor of domestic and international enterprise and correlative study mechanism.And wherein, the phase-changing energy storage material of take is one of energy storage technologies that current range of application is the widest as basic thermal energy storage.
When phase-change accumulation energy utilizes phase change material phase transformation, neither endothermic nor exothermic carries out storage and the release of energy, it is with respect to sensible heat heat accumulation, there is the advantages such as energy storage density is high, homo(io)thermism, at " peak load shifting " of used heat and remaining pick up the heat, sun power utilization, electric power, industry and covil construction, for fields such as the energy-conservation and aerospace of warm air-conditioning, textile industries, be all widely used, most important to realizing economy, social Sustainable development etc.
Phase-changing energy storage material is as the core of phase-change accumulation energy, can be divided into inorganic, organic and high score subclass phase change material, inorganic-phase variable energy storage material be take inorganic salt hydrate as example, not only having fusing point fixes, the advantages such as heat of phase transformation Δ Hf (about 254kJ/kg), thermal conductivity (about 0.5W/m ℃) and volume energy storage density (about 350MJ/L) are large, and because cost is low, preparation simple, thereby there is good application prospect.
But inorganic salt hydrate has, easily cross the shortcoming that cold-peace is separated, material is easily separated out, reduced material service life cycle, seriously restricted practical application; And compared to organism, thermal conductivity is larger, but still have in actual applications necessity of lifting.Therefore how to reduce cold, reduce and be separated and to improve the heat conductivility of material most important for the practical application of material.
Given this, if can provide a kind of, can not only reduce condensate depression and phenomenon of phase separation, improve the service life cycle of material, and phase-changing energy storage material that can also strongthener heat conductivility, by the development that can be energy storage field, provide core material technology, have very important significance.
[summary of the invention]
Object of the present invention is exactly will solve above-mentioned deficiency and a kind of phase-changing energy storage material is provided, and by choosing suitable material and weight proportion, has reduced condensate depression and phenomenon of phase separation, has showed good cyclical stability.
Design for achieving the above object a kind of phase-changing energy storage material, comprise energy storage material of main part, thickening material and nucleator, the quality percentage composition of described energy storage material of main part, thickening material, nucleator is: energy storage material of main part 75%-99%, thickening material 0.1%-10%, nucleator 0.2%-15%.
Preferably, the quality percentage composition of described energy storage material of main part, thickening material, nucleator is: energy storage material of main part 98%, thickening material 1.5%, nucleator 0.5%.
Preferably, also comprise strongthener, the quality percentage composition of described energy storage material of main part, thickening material, nucleator, strongthener is: energy storage material of main part 75%-99%, thickening material 0.1%-10%, nucleator 0.2%-15%, strongthener 0.01%-8%.
Preferably, described energy storage material of main part 92%, thickening material 4%, nucleator 2%, strongthener 2%.
Preferably, described energy storage material of main part is crystal water and salt, and described crystal water and salt are nitrate trihydrate lithium, Sodium acetate trihydrate, nitrate trihydrate calcium, three water dipotassium hydrogen phosphate or Sodium Thiosulfate Pentahydrates.
Preferably, one or more in inorganic thickening agent, fiber-like thickening material, polyacrylate-type thickeners, polyurethanes thickening material and natural polymer subclass thickening material of described thickening material form.
Preferably, one or more in sodium polyacrylate, polyacrylic acid and multipolymer of described polyacrylate-type thickeners form, and one or more in xanthan gum, guar gum, locust bean gum, starch, gelatin of described natural polymer subclass thickening material form.
Preferably, one or more in trisodium phosphate, ten water sodium phosphates, terra alba, potassium sulfate, potassium borate, barium hydroxide, disodium hydrogen phosphate, sodium sulfate of described nucleator form.
Preferably, described strongthener is one or more compositions in metal and metal oxide powder, carbon material, nanoparticle, foam materials.
Preferably, described nanoparticle is one or more in copper nanoparticle, carbon nanotube, and described foam materials is one or more in foamy graphite, foam metal aluminium, foam copper.
Compared with the existing technology, tool has the following advantages in the present invention:
(1) cyclical stability is good.The present invention, in energy storage material of main part, chooses suitable thickening material, nucleator, optimizes material mixture ratio, has effectively reduced the condensate depression of material in working cycle; Thickening material makes material system of the present invention have certain viscosity, sink after stoping crystalline hydrate heat absorption dehydration, while preventing material heat release crystallization can not with water recombine, solved layers of material phenomenon, improved the cyclical stability of material.
(2) thermal conductivity is strong.For the relatively low shortcoming of thermal conductivity, can in energy storage material of main part, add strongthener, be dispersed in phase-changing energy storage material system, in phase-change accumulation energy system, form strong heat conduction network or propping material, thereby the thermal conductivity of material is improved more than 2 times, expanded the range of application of material.
[accompanying drawing explanation]
Fig. 1 is material cyclical stability figure of the present invention.
[embodiment]
The invention provides a kind of phase-changing energy storage material, by choosing suitable material and proportioning, reduced condensate depression and phenomenon of phase separation, showed good cyclical stability, especially in system, added strongthener, formed heat conduction network, thereby the thermal conductivity of material has been improved more than 2 times.This phase-changing energy storage material is comprised of energy storage material of main part, thickening material and nucleator, and its quality percentage composition is, energy storage material of main part 75%-99%, thickening material 0.1%-10%, nucleator 0.2%-15%.As preferably, its each moiety and quality percentage composition be, energy storage material of main part 98%, thickening material 1.5%, nucleator 0.5%.
In this phase-changing energy storage material, also comprise strongthener, its quality percentage composition is, energy storage material of main part 75%-99%, thickening material 0.1%-10%, nucleator 0.2%-15%, strongthener 0.01%-8%.As preferably, each moiety and quality percentage composition be, energy storage material of main part 92%, thickening material 4%, nucleator 2%, strongthener 2%.
Wherein, energy storage material of main part is crystal water and salt, espespecially trihydrate; This crystal water and salt are nitrate trihydrate lithium, Sodium acetate trihydrate, nitrate trihydrate calcium, three water dipotassium hydrogen phosphates or Sodium Thiosulfate Pentahydrate etc.One or more in inorganic thickening agent, fiber-like thickening material, polyacrylate-type thickeners, polyurethanes thickening material and natural polymer subclass thickening material of thickening material form; One or more in sodium polyacrylate, polyacrylic acid and multipolymer of polyacrylate-type thickeners form; One or more in xanthan gum, guar gum, locust bean gum, starch, gelatin etc. of natural polymer subclass thickening material form.One or more in trisodium phosphate, ten water sodium phosphates, terra alba, potassium sulfate, potassium borate, barium hydroxide, disodium hydrogen phosphate, sodium sulfate of nucleator form.Strongthener is one or more compositions in metal and metal oxide powder, carbon material, nanoparticle and foam materials; Nanoparticle is one or more in copper nanoparticle, carbon nanotube etc.; Foam materials is one or more in foamy graphite, foam metal aluminium, foam copper etc.
Below in conjunction with drawings and the specific embodiments, the present invention is done to following further illustrating:
Experimental example 1
Take 40g nitrate trihydrate lithium, 3g carbon fiber, 4g starch, 6g barium sulfate, in reaction vessel, stirs 10min and mixes, be positioned in the water-bath of 40 ℃, heating in water bath to nitrate trihydrate lithium melts completely, after melting, with agitator, stirs 20min, to between component, mix, obtain phase-changing energy storage material.Phase-changing energy storage material is carried out to cyclical stability experiment, and carry out DSC test and thermal conductivity test.Sample circulation 1000 times, enthalpy is 240J/g, thermal conductivity is not add 2.2 times of strongthener.
Experimental example 2
Take 46g Sodium acetate trihydrate, 1g expanded graphite, 2g starch, 1g disodium hydrogen phosphate, in reaction vessel, stir 10min and mix, in the water-bath of 80 ℃, heat, melt completely to Sodium acetate trihydrate, after sample fusing, with agitator, stir component and mix 20min, even to sample mix, obtain phase-changing energy storage material.Phase-changing energy storage material is carried out to cyclical stability experiment, and carry out DSC test, and thermal conductivity test.Its cyclical stability figure refers to Fig. 1, circulates 3000 times, still undamped; Thermal conductivity is 2 times of phase-changing energy storage material that do not add strongthener.
Experimental example 3
Take 49g Sodium acetate trihydrate, 0.25g copper nanoparticle, 0.5g gelatin, 0.25g trisodium phosphate, in reaction vessel, stir 10min and mix, in 80 ℃ of water-baths, be heated to sample and melt completely, after melting, fully stir 20min, even to sample mix, obtain phase-changing energy storage material.Phase-changing energy storage material is carried out to cyclical stability experiment, and carry out DSC test and thermal conductivity test.Circulate 2500 times, enthalpy is 230J/g; Thermal conductivity is 2.5 times of thermal conductivity that do not add strongthener.
The present invention is not subject to the restriction of above-mentioned embodiment, and other any do not deviate from change, the modification done under spirit of the present invention and principle, substitutes, combination, simplify, and all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (10)
1. a phase-changing energy storage material, it is characterized in that, comprise energy storage material of main part, thickening material and nucleator, the quality percentage composition of described energy storage material of main part, thickening material, nucleator is: energy storage material of main part 75%-99%, thickening material 0.1%-10%, nucleator 0.2%-15%.
2. phase-changing energy storage material as claimed in claim 1, is characterized in that, the quality percentage composition of described energy storage material of main part, thickening material, nucleator is: energy storage material of main part 98%, thickening material 1.5%, nucleator 0.5%.
3. phase-changing energy storage material as claimed in claim 1, it is characterized in that, also comprise strongthener, the quality percentage composition of described energy storage material of main part, thickening material, nucleator, strongthener is: energy storage material of main part 75%-99%, thickening material 0.1%-10%, nucleator 0.2%-15%, strongthener 0.01%-8%.
4. phase-changing energy storage material as claimed in claim 3, is characterized in that, described energy storage material of main part 92%, thickening material 4%, nucleator 2%, strongthener 2%.
5. the phase-changing energy storage material as described in any one in claim 1 to 4, it is characterized in that, described energy storage material of main part is crystal water and salt, and described crystal water and salt are nitrate trihydrate lithium, Sodium acetate trihydrate, nitrate trihydrate calcium, three water dipotassium hydrogen phosphate or Sodium Thiosulfate Pentahydrates.
6. the phase-changing energy storage material as described in any one in claim 1 to 4, it is characterized in that, one or more in inorganic thickening agent, fiber-like thickening material, polyacrylate-type thickeners, polyurethanes thickening material and natural polymer subclass thickening material of described thickening material form.
7. phase-changing energy storage material as claimed in claim 6, it is characterized in that, one or more in sodium polyacrylate, polyacrylic acid and multipolymer of described polyacrylate-type thickeners form, and one or more in xanthan gum, guar gum, locust bean gum, starch, gelatin of described natural polymer subclass thickening material form.
8. the phase-changing energy storage material as described in any one in claim 1 to 4, it is characterized in that, one or more in trisodium phosphate, ten water sodium phosphates, terra alba, potassium sulfate, potassium borate, barium hydroxide, disodium hydrogen phosphate, sodium sulfate of described nucleator form.
9. the phase-changing energy storage material as described in any one in claim 3 to 4, is characterized in that, described strongthener is one or more compositions in metal and metal oxide powder, carbon material, nanoparticle, foam materials.
10. phase-changing energy storage material as claimed in claim 9, is characterized in that, described nanoparticle is one or more in copper nanoparticle, carbon nanotube, and described foam materials is one or more in foamy graphite, foam metal aluminium, foam copper.
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| CN201310681548.2A CN103666381A (en) | 2013-12-12 | 2013-12-12 | Phase-change energy-storage material |
| PCT/CN2014/081641 WO2015085761A1 (en) | 2013-12-12 | 2014-07-04 | Phase change energy storage material |
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| CN201310681548.2A CN103666381A (en) | 2013-12-12 | 2013-12-12 | Phase-change energy-storage material |
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