JPH0153713B2 - - Google Patents
Info
- Publication number
- JPH0153713B2 JPH0153713B2 JP56174046A JP17404681A JPH0153713B2 JP H0153713 B2 JPH0153713 B2 JP H0153713B2 JP 56174046 A JP56174046 A JP 56174046A JP 17404681 A JP17404681 A JP 17404681A JP H0153713 B2 JPH0153713 B2 JP H0153713B2
- Authority
- JP
- Japan
- Prior art keywords
- heat
- heat storage
- sodium acetate
- supercooling
- acetate trihydrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000005338 heat storage Methods 0.000 claims description 12
- 235000017281 sodium acetate Nutrition 0.000 claims description 11
- BDKLKNJTMLIAFE-UHFFFAOYSA-N 2-(3-fluorophenyl)-1,3-oxazole-4-carbaldehyde Chemical compound FC1=CC=CC(C=2OC=C(C=O)N=2)=C1 BDKLKNJTMLIAFE-UHFFFAOYSA-N 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 229940087562 sodium acetate trihydrate Drugs 0.000 claims description 10
- 239000011232 storage material Substances 0.000 claims description 8
- PVFSDGKDKFSOTB-UHFFFAOYSA-K iron(3+);triacetate Chemical compound [Fe+3].CC([O-])=O.CC([O-])=O.CC([O-])=O PVFSDGKDKFSOTB-UHFFFAOYSA-K 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims 1
- 238000004781 supercooling Methods 0.000 description 8
- 239000013078 crystal Substances 0.000 description 5
- 150000002505 iron Chemical class 0.000 description 4
- 230000006911 nucleation Effects 0.000 description 4
- 238000010899 nucleation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- MCDLETWIOVSGJT-UHFFFAOYSA-N acetic acid;iron Chemical compound [Fe].CC(O)=O.CC(O)=O MCDLETWIOVSGJT-UHFFFAOYSA-N 0.000 description 1
- 229920006322 acrylamide copolymer Polymers 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000003349 gelling agent Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 iron salt Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Description
【発明の詳細な説明】
本発明は太陽熱を利用する暖房器用の蓄熱材と
して使用される酢酸ナトリウム３水塩の性能改善
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improving the performance of sodium acetate trihydrate used as a heat storage material for heaters that utilize solar heat.
酢酸ナトリウム３水塩は融点が58℃、融解熱が
単位重量当り60cal／ｇ、単位体積当り87cal／c.c.
という特性を持ち、太陽熱を利用する蓄熱材とし
てその実用化が期待される化合物である。 Sodium acetate trihydrate has a melting point of 58°C, a heat of fusion of 60 cal/g per unit weight, and 87 cal/cc per unit volume.
This is a compound that is expected to be put to practical use as a heat storage material that utilizes solar heat.
しかし融解蓄熱―凝固放熱のヒートサイクルに
おいて過冷却現象がおこり易く融解蓄熱後、目的
とする温度で凝固が始まらず、放熱が効率良く出
来ない難点がある。 However, in the heat cycle of melting heat storage and solidification heat release, supercooling phenomenon tends to occur, and solidification does not start at the desired temperature after melting heat storage, making it difficult to efficiently release heat.
かかる過冷却現象は酢酸ナトリウム３水塩に限
らず、無機水和塩、有機水和塩を主剤とする蓄熱
材の宿命的な欠陥とも言え、その実用化が阻まれ
ている最大の原因であるので、従来より幾多の解
決策即ち各種の核生成助剤を添加して過冷却を防
止する試みが報告されているが、その効果は必ず
しも充分でなくその対策が要望されている。 This supercooling phenomenon is not limited to sodium acetate trihydrate, but can be said to be a fatal flaw in heat storage materials whose main ingredients are inorganic hydrated salts and organic hydrated salts, and is the biggest reason for preventing their practical application. Therefore, a number of solutions have been reported, namely attempts to prevent supercooling by adding various nucleation aids, but the effects are not always sufficient and countermeasures are desired.
しかるに本発明者は酢酸ナトリウム３水塩の過
冷却を抑え蓄熱―放熱サイクルを効率良く行なう
ための核生成助剤について鋭意研究を重ねたとこ
ろ、酢酸鉄（以下単に鉄塩と略記する）が過冷却
防止に顕著な効果を発揮し得ることを見出し本発
明を完成するに到つた。 However, the present inventor conducted intensive research on nucleation aids for suppressing supercooling of sodium acetate trihydrate and efficiently performing the heat storage-heat release cycle, and found that iron acetate (hereinafter simply referred to as iron salt) was The present invention was completed after discovering that it can exhibit a remarkable effect in preventing cooling.
蓄熱状態の酢酸ナトリウム３水塩融解物は潜熱
を放出することにより、次第に冷却していく。
（勿論この放熱も暖房用として利用する。）放冷が
進み凝固点に達すると理論上は酢酸ナトリウム３
水塩の結晶が析出し始め凝固熱の発生により放熱
が継続するはずであるが、通常は凝固点以下の温
度になつても結晶の析出がおこらず、放熱量が著
しく低下するのが実情である。本発明においては
鉄塩を共存させておくことにより、それが核形成
助剤として作用し酢酸ナトリウム３水塩は凝固点
付近において正確に結晶の析出がおこり過冷却が
防止出来る。更に鉄塩の核形成助剤としての作用
は、蓄熱―放熱の熱サイクルを長期にわたつて行
つても顕著に発揮され、そのライフの点において
も実用性の高いものである。 The molten sodium acetate trihydrate in a heat-accumulating state gradually cools down by releasing latent heat.
(Of course, this heat radiation is also used for heating purposes.) As the cooling progresses and reaches the freezing point, theoretically, sodium acetate 3
Crystals of water salt begin to precipitate, and heat radiation is supposed to continue due to the generation of heat of solidification, but the reality is that crystals do not precipitate even when the temperature drops below the freezing point, and the amount of heat radiation decreases significantly. . In the present invention, by allowing an iron salt to coexist, it acts as a nucleation aid and crystals of sodium acetate trihydrate are accurately precipitated near the freezing point, thereby preventing supercooling. Furthermore, the action of the iron salt as a nucleation aid is remarkable even when a heat storage-heat release thermal cycle is performed over a long period of time, and it is highly practical in terms of its life.
本発明の鉄塩としては酢酸第二鉄、酢酸第一鉄
が例示される。 Examples of the iron salt of the present invention include ferric acetate and ferrous acetate.
鉄塩は組成物の全量に対して0.1〜50000ppm好
ましくは10〜1500ppmの割合で配合される。
0.1ppm以下では過冷却防止効果に乏しく、一方
50000ppm以上では潜熱の低下がおこり易く不利
である。 The iron salt is blended in a proportion of 0.1 to 50000 ppm, preferably 10 to 1500 ppm, based on the total amount of the composition.
Below 0.1ppm, the supercooling prevention effect is poor;
If it exceeds 50,000 ppm, the latent heat tends to decrease, which is disadvantageous.
本発明の組成物には他の蓄熱材更にはゲル化剤
等の任意の蓄熱助剤を併用して差支えない。 The composition of the present invention may be used in combination with other heat storage materials and any heat storage aids such as gelling agents.
かくして得られる蓄熱材組成物は太陽熱を利用
するソーラーシステムの暖房用に好適に用いら
れ、長期にわたつて安定なヒートサイクルを実施
することが可能である。 The heat storage material composition obtained in this way is suitably used for heating in a solar system that utilizes solar heat, and can perform a stable heat cycle over a long period of time.
次に実例を挙げて本発明の蓄熱材組成物を更に
具体的に説明する。 Next, the heat storage material composition of the present invention will be explained in more detail by giving examples.
実例 １
酢酸ナトリウム３水塩50.0ｇと酢酸第二鉄0.5
ｇを混合し、80℃に加熱して２時間保ち蓄熱組成
物を得た。次いで放冷したところ54℃で過冷却が
破壊され酢酸ナトリウム３水塩の結晶の析出が始
まり液温は58℃まで上昇し潜熱を放出し終るまで
58℃を持続した。ヒートサイクルを30回以上つづ
けても同じ結果が得られた。Example 1 Sodium acetate trihydrate 50.0g and ferric acetate 0.5g
g was mixed, heated to 80°C and kept for 2 hours to obtain a heat storage composition. Then, when it was left to cool, the supercooling was destroyed at 54℃, and crystals of sodium acetate trihydrate started to precipitate.The liquid temperature rose to 58℃, until the latent heat was released.
The temperature was maintained at 58℃. The same results were obtained even after repeated heat cycles for more than 30 times.
実例 ２
酢酸ナトリウム３水塩50.0ｇ、酢酸第二鉄
0.0032ｇとからなる組成物にアクリルアミド／ア
クリル酸共重合体を２％添加した。80℃において
撹拌加熱してゲル状の蓄熱材組成物を得た。該組
成物を放冷したところ56℃で過冷却が破壊され結
晶の析出が始まつた。50回以上ヒートサイクルを
くり返しても同一の結果が得られた。Example 2 Sodium acetate trihydrate 50.0g, ferric acetate
2% of acrylamide/acrylic acid copolymer was added to a composition consisting of 0.0032 g. The mixture was stirred and heated at 80° C. to obtain a gel-like heat storage material composition. When the composition was allowed to cool, supercooling was broken at 56°C and crystals began to precipitate. The same results were obtained even after repeating the heat cycle more than 50 times.
Claims (1)
る蓄熱材組成物。1. A heat storage material composition formed by blending iron acetate with sodium acetate trihydrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17404681A JPS5874777A (en) | 1981-10-29 | 1981-10-29 | Heat-accumulating material composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17404681A JPS5874777A (en) | 1981-10-29 | 1981-10-29 | Heat-accumulating material composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5874777A JPS5874777A (en) | 1983-05-06 |
| JPH0153713B2 true JPH0153713B2 (en) | 1989-11-15 |
Family
ID=15971669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17404681A Granted JPS5874777A (en) | 1981-10-29 | 1981-10-29 | Heat-accumulating material composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5874777A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57102982A (en) * | 1980-12-19 | 1982-06-26 | Matsushita Electric Ind Co Ltd | Heat accumulating material |
-
1981
- 1981-10-29 JP JP17404681A patent/JPS5874777A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57102982A (en) * | 1980-12-19 | 1982-06-26 | Matsushita Electric Ind Co Ltd | Heat accumulating material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5874777A (en) | 1983-05-06 |
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