CN101235276A - Room temperature phase-change energy-storage medium and preparation method thereof - Google Patents
Room temperature phase-change energy-storage medium and preparation method thereof Download PDFInfo
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- CN101235276A CN101235276A CNA2008100306793A CN200810030679A CN101235276A CN 101235276 A CN101235276 A CN 101235276A CN A2008100306793 A CNA2008100306793 A CN A2008100306793A CN 200810030679 A CN200810030679 A CN 200810030679A CN 101235276 A CN101235276 A CN 101235276A
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Abstract
An ambient temperature phase-change energy-storing medium and a preparation process are disclosed, which is formed by components with percentage by weight, 65-71wt. % 3H2O lithium nitrate, 20.8-32wt. % 6H2O magnesium nitrate and 2.8-8.2wt.% sodium nitrate. The preparation process comprise mixing the components according to proportion and heating up to 30-40 DEG C, and then evenly stirring after solid phase is melted into liquid phase, and the liquid phase can be used as phase-change energy-storing medium. The material of the invention has the characteristics of approximate phase-change temperature to the ambient temperature, environmental protection and lower cost.
Description
Technical field:
The present invention relates to a kind of phase change material with phase deformation type heat energy storage.
Background technology
Phase-change and energy-storage medium at room temperature is a kind of undergoing phase transition in narrow room temperature region and storing or the material of release of heat.Its mechanism of action is, when temperature during a little more than room temperature (15 ℃-25 ℃), phase-change and energy-storage medium at room temperature absorbs a large amount of heats and melts from environment, energy storage is got up, when temperature is lower than the said temperature zone, the phase-change and energy-storage medium at room temperature that has melted is condensed into solid and discharges a large amount of heats to indoor environment, thereby keeps the constant relatively of room temperature.In temperature difference per day or the very big area of week (per week) temperature difference, phase-change and energy-storage medium at room temperature has important use and is worth, and it can be used as the absorption agent of sun power in the high temperature period, and gives indoor heating at night or colder period, thereby reaches purpose of energy saving.
The ideal phase-changing energy storage material generally should have the molten point of relative constant, and in the time of so just may working as envrionment temperature and be higher or lower than transformation temperature, energy storage material absorbs or releases energy to environment from environment as much as possible.This feature absorbs energy and keeps the constant significant of room temperature for energy storage material from low-grade sun power.
Material as phase-change and energy-storage medium can be anhydrous salt, salt water chemical compound and composition thereof, organism etc.Wherein have as the organism of room temperature phase-change energy-storage material dangerous inflammable, shortcoming such as price is more expensive, and thermal conductivity is bad; Anhydrous fused salt is applicable to high-temperature heat-storage; Salt water chemical compound and composition thereof is suitable for storing low-temperature heat source, and these materials are in sun power and city UTILIZATION OF VESIDUAL HEAT IN, and many-sides such as the peak load shifting of electrical network have a wide range of applications.
At present, cheap, safe, particularly transformation temperature is actually rare at 15 ℃～25 ℃ phase change material.Transformation temperature is then especially rare at the nonflammable inorganic phase-changing material of above-mentioned scope.
Summary of the invention
Purpose of the present invention aims to provide a kind of transformation temperature near room temperature, comparatively environmental protection, lower-cost inorganic-phase variable energy-accumulating medium.
The contriver is by discovering, after nitrate trihydrate lithium, magnesium nitrate hexahydrate and SODIUMNITRATE are mixed according to a certain percentage, can obtain the energy-accumulating medium of an eutectic phase alternating temperature degree about 24 ℃.
The objective of the invention is to realize by following manner:
Energy-accumulating medium of the present invention is by 65-71wt.% nitrate trihydrate lithium, and the SODIUMNITRATE of 20.8-32.2wt.% magnesium nitrate hexahydrate and 2.8-8.2wt.% is formed.
The best group of described energy-accumulating medium becomes nitrate trihydrate lithium: 68.12wt.%, magnesium nitrate hexahydrate: 26.42wt.%, SODIUMNITRATE: 5.46wt.%.
With nitrate trihydrate lithium, magnesium nitrate hexahydrate, SODIUMNITRATE by the proportioning Hybrid Heating to 30-100 ℃, after stirring and keeping for some time, these solid phases are molten into liquid phase, this liquid phase promptly can be used as phase-change and energy-storage medium and uses.
Above-mentioned nitrate trihydrate lithium can make by the condensing crystal lithium nitrate solution, and also can be by water and anhydrous nitric acid lithium by 3 ± 0.2: 1 mol ratio mixed makes.Above-mentioned magnesium nitrate hexahydrate can make by the condensing crystal magnesium nitrate solution, and also can be by water and anhydrous nitric acid magnesium by 6 ± 0.2: 1 mol ratio mixed makes.
Above-mentioned energy storage material also can be formed by magnesium nitrate solution, lithium nitrate solution and sodium nitrate solution allotment, and the material after the allotment contains lithium nitrate 36.4-40.0wt.%, magnesium nitrate 12.0-18.7wt.%, SODIUMNITRATE 2.8-8.2wt.%, water 33.1-48.8wt.%.
Its mechanism of action is, has an eutectic point of being made up of nitrate trihydrate lithium, magnesium nitrate hexahydrate and SODIUMNITRATE in lithium nitrate-magnesium nitrate-SODIUMNITRATE-water quaternary system, and the eutectic temperature of this point is about 24 ℃.
This energy-accumulating medium is packaged in metal or transparent glass (or synthetic glass) container, places the indoor or body of wall of buildings, be used to regulate room temp, make it remain on a comfortable temperature range.
The effect of invention:
The inventor by experimental study repeatedly determined that each component and the corresponding content of this phase-change and energy-storage medium at room temperature, this material have that phase transformation temperature points is stable, solid phase is formed, phase transformation consistent with the liquid phase composition and is varied with temperature plurality of advantages such as sensitivity during phase transformation.When envrionment temperature was higher than 25 ℃, this energy storage material absorbed heat in large quantities by the thawing of self from environment, and when envrionment temperature was lower than 22 ℃, energy storage material solidified and discharges a large amount of heats to environment, thereby kept the stable of envrionment temperature.The constant temperature effect of the energy storage material of being invented is seen following embodiment:
Description of drawings
Fig. 1 energy storage material is formed synoptic diagram
Fig. 2 is best, and energy storage material is inhaled the exothermic temperature graphic representation
Fig. 3 energy storage material 1 is inhaled the exothermic temperature graphic representation
Fig. 4 energy storage material 2 is inhaled the exothermic temperature graphic representation
Fig. 5 energy storage material 3 is inhaled the exothermic temperature graphic representation
Fig. 6 energy storage material 4 is inhaled the exothermic temperature graphic representation
Fig. 7 energy storage material 5 is inhaled the exothermic temperature graphic representation
Fig. 8 energy storage material 6 is inhaled the exothermic temperature graphic representation
Fig. 9 energy storage material 7 is inhaled the exothermic temperature graphic representation
Embodiment:
Following examples are in order to explain the present invention in more detail, but are not limitations of the present invention, and the present invention can implement by the described arbitrary mode of summary of the invention.
Embodiment 1:
68.12 gram nitrate trihydrate lithiums, 26.42 gram magnesium nitrate hexahydrates and 5.46 gram SODIUMNITRATE are mixed, be heated to 30-40 ℃ and keep for some time, find that solid is fused into liquid fully, this liquid is formed shown in the point of a among Fig. 1, this liquid contains 38.18 gram lithium nitrates, 15.28 gram magnesium nitrates, 5.46 gram SODIUMNITRATE and 41.08 gram water.Adorn this liquid in encloses container, this container placed 15 ℃ air ambient, recording medium temperature changes shown in Fig. 2 solid line, as seen, a tangible temperature platform appears about 22 ℃, this is to discharge a large amount of heats because medium solidifies under this temperature to environment, thereby keeps the stable of self temperature.The crystallization behavior of observing medium as seen, in the time of 25 ℃, medium is entirely liquid state, and in the time of 21 ℃, medium almost completely changes into solid-state.
It is 30 ℃ environment that the container that completely crued this energy-accumulating medium will be housed again places room temperature, and the medium heating curve is shown in Fig. 2 solid line.As seen, a tangible temperature platform is arranged about 24 ℃, this is this medium a large amount of causes that absorb heat from environment, is higher than 25 ℃, and medium melts fully, thereby heat-up rate is accelerated.
Pure water with same weight repeats said process, record its temperature lift-down curve shown in Fig. 2 dotted line, but water breakthrough promptly reaches envrionment temperature in very short time.
Compare both as seen, energy-accumulating medium of the present invention can absorb a large amount of heats from the environment that is higher than 25 ℃, and discharge a large amount of heats to being lower than 22 ℃ of environment, thus keep the constant of medium itself and envrionment temperature, its temperature adjusting ability is bigger a lot of times than pure water.
Embodiment 2:
65 gram nitrate trihydrate lithiums, 32.2 gram magnesium nitrate hexahydrates and 2.8 gram SODIUMNITRATE are mixed, be heated to 30-40 ℃ and keep for some time, find that solid is fused into liquid fully, this liquid is formed shown in 1 among Fig. 1, this liquid contains 36.44 gram lithium nitrates, 18.62 gram magnesium nitrates, 2.8 gram SODIUMNITRATE and 42.14 gram water.Adorn this liquid in encloses container, carry out the heating and cooling experiment by embodiment 1 described condition, the result is shown in Fig. 3 solid line.As seen this material also has tangible temperature platform between 21-25 ℃, and just the temperature lowering curve quality is poor slightly.Compare with pure water, this energy-accumulating medium still has good constant room-temperature property, can be used as the room temperature phase-change energy-storage material equally and uses.
Embodiment 3
71 gram nitrate trihydrate lithiums, 26.2 gram magnesium nitrate hexahydrates and 2.8 gram SODIUMNITRATE are mixed, be heated to 30-40 ℃ and keep for some time, find that solid is fused into liquid fully, this liquid is formed shown in 2 among Fig. 1, this liquid contains 39.8 gram lithium nitrates, 15.15 gram magnesium nitrates, 2.8 gram SODIUMNITRATE and 42.25 gram water.Adorn this liquid in encloses container, carry out the heating and cooling experiment by embodiment 1 described condition, the result is shown in Fig. 4 solid line.As seen this material also has tangible temperature platform between 21-25 ℃, and just the temperature lowering curve quality is poor slightly.Compare with pure water, this energy-accumulating medium still has good constant room-temperature property, can be used as the room temperature phase-change energy-storage material equally and uses.
Embodiment 4
71 gram nitrate trihydrate lithiums, 20.8 gram magnesium nitrate hexahydrates and 8.2 gram SODIUMNITRATE are mixed, be heated to 30-40 ℃ and keep for some time, find that solid is fused into liquid fully, this liquid is formed shown in 3 among Fig. 1, this liquid contains 39.8 gram lithium nitrates, 12.03 gram magnesium nitrates, 8.2 gram SODIUMNITRATE and 39.97 gram water.Adorn this liquid in encloses container, carry out the heating and cooling experiment by embodiment 1 described condition, the result is shown in Fig. 5 solid line.As seen this material also has tangible temperature platform between 21.5-24.7 ℃.Compare with pure water, this energy-accumulating medium has good constant room-temperature property, can be used as the room temperature phase-change energy-storage material equally and uses.
Embodiment 5
65 gram nitrate trihydrate lithiums, 26.8 gram magnesium nitrate hexahydrates and 8.2 gram SODIUMNITRATE are mixed, be heated to 30-40 ℃ and keep for some time, find that solid is fused into liquid fully, this liquid is formed shown in 4 among Fig. 1, this liquid contains 36.43 gram lithium nitrates, 15.5 gram magnesium nitrates, 8.2 gram SODIUMNITRATE and 39.87 gram water.Adorn this liquid in encloses container, carry out the heating and cooling experiment by embodiment 1 described condition, the result is shown in Fig. 6 solid line.As seen this material also has tangible temperature platform between 22-24.4 ℃.Compare with pure water, this energy-accumulating medium has good constant room-temperature property, can be used as the room temperature phase-change energy-storage material equally and uses.
Comparative Examples 1
50 gram nitrate trihydrate lithiums, 48.5 gram magnesium nitrate hexahydrates and 1.5 gram SODIUMNITRATE are mixed, be heated to 30-40 ℃ and keep for some time, find that solid is fused into liquid fully, this liquid is formed shown in 5 among Fig. 1, this liquid contains 28.03 gram lithium nitrates, 28.05 gram magnesium nitrates, 1.5 gram SODIUMNITRATE and 42.42 gram water.Adorn this liquid in encloses container, carry out the heating and cooling experiment by embodiment 1 described condition, the result is shown in Fig. 7 solid line.As seen this material has an extremely short platform in temperature-fall period, and in temperature-rise period no tangible platform, thereby can not be as the energy storage material use of constant room temperature.
Comparative Examples 2
88 gram nitrate trihydrate lithiums, 10.5 gram magnesium nitrate hexahydrates and 1.5 gram SODIUMNITRATE are mixed, be heated to 30-40 ℃ and keep for some time, find that solid is fused into liquid fully, this liquid is formed shown in 6 among Fig. 1, this liquid contains 49.33 gram lithium nitrates, 6.07 gram magnesium nitrates, 1.5 gram SODIUMNITRATE and 43.1 gram water.Adorn this liquid in encloses container, carry out the heating and cooling experiment by embodiment 1 described condition, the result is shown in Fig. 8 solid line.As seen this material does not all have tangible platform in intensification and temperature-fall period, thereby can not use as the energy storage material of constant room temperature.
Comparative Examples 3
58.5 gram nitrate trihydrate lithiums, 23 gram magnesium nitrate hexahydrates and 18.5 gram SODIUMNITRATE are mixed, be heated to 30-40 ℃ and keep for some time, discovery still has the part solid not to be fused into liquid, this mixture is formed shown in 7 among Fig. 1, this mixture contains 32.79 gram lithium nitrates, 13.3 gram magnesium nitrates, 18.5 gram SODIUMNITRATE and 35.41 gram water.Adorn this mixture in encloses container, carry out the heating and cooling experiment by embodiment 1 described condition, the result is shown in Fig. 9 solid line.Because some solid does not dissolve in whole intensification and cooling period always, thereby minimum to constant room temperature contribution, therefore, although the material of this proportioning all has tangible platform in intensification and cooling period, but platform is held time too short, still is not suitable for using as the energy storage material of constant room temperature.
Claims (6)
1. a phase-change and energy-storage medium at room temperature is characterized in that, is 65-71wt.% nitrate trihydrate lithium by weight percent, and the SODIUMNITRATE of 20.8-32.2wt.% magnesium nitrate hexahydrate and 2.8-8.2wt.% is formed.
2. a kind of phase-change and energy-storage medium at room temperature according to claim 1 is characterized in that, described energy-accumulating medium consist of nitrate trihydrate lithium: 68.12wt.%, magnesium nitrate hexahydrate: 26.42wt.%, SODIUMNITRATE: 5.46wt.%.
3. prepare the described a kind of phase-change and energy-storage medium at room temperature of claim 1, it is characterized in that, nitrate trihydrate lithium, magnesium nitrate hexahydrate, SODIUMNITRATE are arrived 30-100 ℃ by the proportioning Hybrid Heating, after stirring and keeping for some time, these solid phases are molten into liquid phase, and this liquid phase promptly can be used as phase-change and energy-storage medium and uses.
4. the preparation method of a kind of phase-change and energy-storage medium at room temperature according to claim 3 is characterized in that, the nitrate trihydrate lithium makes by the condensing crystal lithium nitrate solution, or by water and anhydrous nitric acid lithium by 3 ± 0.2: 1 mol ratio mixed makes.
5. the preparation method of a kind of phase-change and energy-storage medium at room temperature according to claim 3 is characterized in that, magnesium nitrate hexahydrate makes by the condensing crystal magnesium nitrate solution, or by water and anhydrous nitric acid magnesium by 6 ± 0.2: 1 mol ratio mixed makes.
6. the preparation method who prepares the described a kind of phase-change and energy-storage medium at room temperature of claim 1, it is characterized in that, this medium is formed by magnesium nitrate solution, lithium nitrate solution and sodium nitrate solution allotment, material after the allotment contains lithium nitrate 36.4-40.0wt.%, magnesium nitrate 12.0-18.7wt.%, SODIUMNITRATE 2.8-8.2wt.%, water 33.1-48.8wt.%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103881661A (en) * | 2014-03-17 | 2014-06-25 | 中南大学 | Phase-change energy storage medium and preparation method thereof |
| CN109609098A (en) * | 2018-12-12 | 2019-04-12 | 上海交通大学 | A kind of composite phase-change heat-storage material and its preparation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103881661A (en) * | 2014-03-17 | 2014-06-25 | 中南大学 | Phase-change energy storage medium and preparation method thereof |
| CN103881661B (en) * | 2014-03-17 | 2017-04-26 | 中南大学 | Phase-change energy storage medium and preparation method thereof |
| CN109609098A (en) * | 2018-12-12 | 2019-04-12 | 上海交通大学 | A kind of composite phase-change heat-storage material and its preparation |
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Granted publication date: 20091118 Termination date: 20160225 |