JPH0299584A - Latent heat storage material - Google Patents
Latent heat storage materialInfo
- Publication number
- JPH0299584A JPH0299584A JP24981088A JP24981088A JPH0299584A JP H0299584 A JPH0299584 A JP H0299584A JP 24981088 A JP24981088 A JP 24981088A JP 24981088 A JP24981088 A JP 24981088A JP H0299584 A JPH0299584 A JP H0299584A
- Authority
- JP
- Japan
- Prior art keywords
- heat storage
- latent heat
- storage material
- nucleating agent
- solidification
- 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.)
- Pending
Links
- 238000005338 heat storage Methods 0.000 title claims abstract description 24
- 239000011232 storage material Substances 0.000 title claims abstract description 17
- 239000002667 nucleating agent Substances 0.000 claims abstract description 11
- HUTDDBSSHVOYJR-UHFFFAOYSA-H bis[(2-oxo-1,3,2$l^{5},4$l^{2}-dioxaphosphaplumbetan-2-yl)oxy]lead Chemical compound [Pb+2].[Pb+2].[Pb+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O HUTDDBSSHVOYJR-UHFFFAOYSA-H 0.000 claims abstract description 5
- DGLRDKLJZLEJCY-UHFFFAOYSA-L disodium hydrogenphosphate dodecahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].OP([O-])([O-])=O DGLRDKLJZLEJCY-UHFFFAOYSA-L 0.000 claims description 6
- 238000007711 solidification Methods 0.000 abstract description 12
- 230000008023 solidification Effects 0.000 abstract description 12
- 230000008018 melting Effects 0.000 abstract description 9
- 238000002844 melting Methods 0.000 abstract description 9
- 238000004781 supercooling Methods 0.000 abstract description 8
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 3
- 229910019142 PO4 Inorganic materials 0.000 description 4
- 150000004677 hydrates Chemical class 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 101100283604 Caenorhabditis elegans pigk-1 gene Proteins 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 229910000397 disodium phosphate Inorganic materials 0.000 description 1
- 235000019800 disodium phosphate Nutrition 0.000 description 1
- JWEBAGKDUWFYTO-UHFFFAOYSA-L disodium;hydrogen phosphate;decahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].OP([O-])([O-])=O JWEBAGKDUWFYTO-UHFFFAOYSA-L 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、潜熱蓄熱材に関する。更に詳しくは。[Detailed description of the invention] [Industrial application field] The present invention relates to a latent heat storage material. For more details.
凝固時の過冷却の程度を軽減し、長期の熱サイクルに対
し安定した性能を発揮する潜熱蓄熱材に関する。This invention relates to a latent heat storage material that reduces the degree of supercooling during solidification and exhibits stable performance against long-term thermal cycles.
潜熱蓄熱材としては、従来から水や砕石が用いられてき
たが、これらは蓄熱密度が小さいため（Ｉｃａｌ／ｇ’
ｄｅｇ以下）、実用に際してはかなり大きな蓄熱器を必
要とする。また、放熱に伴って、蓄熱器内の温度は徐々
に低下するので、安定な熱エネルギーを得ることは、技
術的にかなり困難である。Water and crushed stone have traditionally been used as latent heat storage materials, but these have low heat storage density (Ical/g'
deg or less), a fairly large heat storage device is required for practical use. Furthermore, as the heat is radiated, the temperature inside the heat storage device gradually decreases, so it is technically quite difficult to obtain stable thermal energy.
これに対し、近年物質の融解、凝固の際の潜熱を蓄熱に
応用する研究、開発が盛んになってきている。このよう
な潜熱型の蓄熱材の特徴は、材料の融解温度に一致した
一定温度の熱エネルギーを。In response, research and development on applying latent heat during melting and solidification of substances to heat storage has become active in recent years. The characteristic of this type of latent heat storage material is that it stores thermal energy at a constant temperature that matches the melting temperature of the material.
数１０ｃａｌ／ｇという高い蓄熱密度で安定に吸収およ
び放出できる点にある。It can be stably absorbed and released at a high heat storage density of several tens of cal/g.
かかる潜熱蓄熱材としては、パラフィンワックスや高級
脂肪酸などの有機物や無機水和物などが注目されている
。As such latent heat storage materials, organic substances and inorganic hydrates such as paraffin wax and higher fatty acids are attracting attention.
潜熱蓄熱材としての有機物は、融解、凝固時における安
定性は良好であるものの、材料自身の熱伝導が悪いため
、熱の吸収および放出を行なう上で問題がある。また、
比重が小さいため、蓄熱器も比較的大きなものとなって
くる。Although organic materials as latent heat storage materials have good stability during melting and solidification, they have problems in absorbing and releasing heat because the materials themselves have poor thermal conductivity. Also,
Since the specific gravity is small, the heat storage device is also relatively large.
一方、無機水和物は、有機物蓄熱材と比較して熱伝導率
は約２倍程よく、比重も１．５〜２．０程度と大きいた
め、蓄熱器も小さくすることができる。On the other hand, inorganic hydrates have about twice the thermal conductivity as organic heat storage materials, and have a high specific gravity of about 1.5 to 2.0, so the heat storage device can also be made smaller.
しかるに、無機水和物は、一般に凝固開始温度が融解温
度よりも低くなるという、いわゆる過冷却現象を示す。However, inorganic hydrates generally exhibit a so-called supercooling phenomenon in which the solidification initiation temperature becomes lower than the melting temperature.
かかる現象は、無機水和物を蓄熱材として用いた場合、
一定温度の熱エネルギーを安定して吸収および放出する
という潜熱蓄熱材の特徴を著しく損わせるものである。This phenomenon occurs when inorganic hydrates are used as heat storage materials.
This significantly impairs the characteristic of the latent heat storage material that it stably absorbs and releases thermal energy at a constant temperature.
リン酸水素２ナトリウム・１２水和物Ｎａ２ＨＰＯ４・
１２１１□０は、融解温度が３６℃であり、潜熱量が５
４ｃａｌ／ｇ（示差走査熱量計による）の潜熱蓄熱材で
あるが、この無機水和物の場合にも過冷却現象がみられ
る。Disodium hydrogen phosphate, dodecahydrate Na2HPO4,
1211□0 has a melting temperature of 36℃ and a latent heat amount of 5
Although it is a latent heat storage material with a value of 4 cal/g (as measured by a differential scanning calorimeter), a supercooling phenomenon is also observed in the case of this inorganic hydrate.
即ち、−旦融解させたリン酸水素２ナトリウム・１２水
和物は、約２０℃前後の室温に放置しても固化しないの
である。これは、リン酸水素２ナトリウム・１２水和物
の凝固開始温度が約１０℃であり、結局約２５℃近い温
度差に相当する過冷却を生ずるためである。従って、３
６℃における熱の吸収・放出が全く円滑に行われないの
で、これ単独では潜熱蓄熱材として使用することができ
ない。That is, once melted disodium hydrogen phosphate dodecahydrate does not solidify even if it is left at room temperature of about 20°C. This is because the solidification initiation temperature of disodium hydrogen phosphate dodecahydrate is about 10°C, which results in supercooling corresponding to a temperature difference of about 25°C. Therefore, 3
Since absorption and release of heat at 6° C. is not performed smoothly at all, it cannot be used alone as a latent heat storage material.
本発明は、リン酸水素２ナトリウム・１２水和物の過冷
却の程度を軽減させた潜熱蓄熱材を提供することを目的
とする。An object of the present invention is to provide a latent heat storage material in which the degree of supercooling of disodium hydrogen phosphate dodecahydrate is reduced.
〔課題を解決するための手段〕および〔作用〕かかる目
的を達成させる本発明の潜熱蓄熱材は、リン酸水素２ナ
トリウム・１２水和物に発核剤としてリン酸鉛を添加し
てなる。[Means for Solving the Problems] and [Operation] The latent heat storage material of the present invention that achieves the above objects is made by adding lead phosphate as a nucleating agent to disodium hydrogen phosphate dodecahydrate.
添加された発核剤たるＰｂ３ （ＰＯ４）２による過冷
却軽減の程度は、その添加割合によっても異なるが、必
要量以上の発核剤を添加すると、リン酸水素２ナトリウ
ム・１２水和物本来の潜熱量が著しく低下し、蓄熱材と
しての機能が失われるばかりではなく、材料の変質をも
招くため、一般にｐｂ□（ＰＯ４）ｚはＮａ、ＨＰＯ４
４２Ｈ２０に対して、約０．１〜２０重量％、好ましく
は約０．５〜１０重！１％の割合で用いられる。The degree of supercooling reduction due to the added nucleating agent Pb3 (PO4)2 varies depending on its addition ratio, but if more than the required amount of nucleating agent is added, disodium hydrogen phosphate decahydrate In general, pb□(PO4)z is replaced by Na, HPO4.
About 0.1 to 20% by weight, preferably about 0.5 to 10% by weight, based on 42H20! Used at a rate of 1%.
リン酸水素２ナトリウム・１２水和物にリン酸鉛を発核
剤として添加することにより、過冷却度を著しく軽減す
ることができる。また、それに伴って、融解温度への復
帰時間も短かくなり、それをくり返し加熱融解させた場
合にも、その効果が失われることがなく、長期にわたる
使用においても安定した効果が発揮される。By adding lead phosphate as a nucleating agent to disodium hydrogen phosphate dodecahydrate, the degree of supercooling can be significantly reduced. In addition, the time required to return to the melting temperature is also shortened, and the effect is not lost even when repeatedly heated and melted, and the effect is stable even during long-term use.
次に、実施例について本発明を説明する。 Next, the present invention will be explained with reference to examples.
実施例
Ｎａ２ＨＰＯ４・１２Ｈ２０１０ｇを容ｉ２０ｍＲのガ
ラス製容器にとり、これにＰｂ、（ＰＯ４）、 ０．３
ｇを添加し、密栓する。これを恒温槽内に入れ、６０℃
で加熱したところ３６℃で融解した。次いで、これを毎
分１℃の冷却速度で冷却すると２８℃で凝固が開始され
、試料温度は３６℃に上昇して凝固が進行し、凝固が終
了するとその温度は低下した。このような状態は、第１
図のグラフに実線で示されている。一方、Ｐｂ、 （Ｐ
Ｏ，）ｚを添加しないものは、グラフに点線で示されて
おり、１０℃の環境温度で始めて凝固が開始した。Example 2010 g of Na2HPO4.12H was placed in a glass container with a capacity of 20 mR, and Pb, (PO4), 0.3
Add g and seal tightly. Place this in a thermostat at 60°C.
When heated at 36°C, it melted. Next, when this was cooled at a cooling rate of 1° C./min, solidification started at 28° C., the sample temperature rose to 36° C., solidification progressed, and when solidification was completed, the temperature decreased. This situation is the first
It is shown as a solid line in the graph of the figure. On the other hand, Pb, (P
The sample to which O,)z was not added is indicated by a dotted line in the graph, and coagulation started only at an ambient temperature of 10°C.
また１発核剤を添加したものの凝固開始温度は、融解−
凝固を２０回くり返しても±３℃の差の範囲内に収った
。従って、Ｐｂ３ （ＰＯ４）ｚを発核剤として用いる
ことで、融解温度（Ｔｍ）と凝固開始温度（Ｔｍ’）と
の差（ΔＴｓｃ）は１発核剤を用いないときの２６℃か
ら約８℃に迄その値を低下させることができた。In addition, the solidification start temperature of the product with one nucleating agent added is melting -
Even after repeating the coagulation 20 times, the difference was within ±3°C. Therefore, by using Pb3 (PO4)z as a nucleating agent, the difference (ΔTsc) between the melting temperature (Tm) and the solidification initiation temperature (Tm') is reduced from 26°C when no nucleating agent is used to approximately 8°C. It was possible to reduce the value to ℃.
なお、Ｐｂ、 （ｐｏ、 ）２を０．１〜２０重ｉ％の
範囲内で添加したときのΔＴｓｃは、１２〜６℃の間の
値を示した。Note that when Pb, (po, )2 was added in a range of 0.1 to 20% by weight, ΔTsc showed a value between 12 and 6°C.
第１図は、融解潜熱蓄熱材の凝固時の挙動を示すグラフ
である。FIG. 1 is a graph showing the behavior of the latent heat storage material during solidification.
Claims (1)
てリン酸鉛を添加してなる潜熱蓄熱材。1. A latent heat storage material made by adding lead phosphate as a nucleating agent to disodium hydrogen phosphate dodecahydrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24981088A JPH0299584A (en) | 1988-10-05 | 1988-10-05 | Latent heat storage material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24981088A JPH0299584A (en) | 1988-10-05 | 1988-10-05 | Latent heat storage material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0299584A true JPH0299584A (en) | 1990-04-11 |
Family
ID=17198543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24981088A Pending JPH0299584A (en) | 1988-10-05 | 1988-10-05 | Latent heat storage material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0299584A (en) |
-
1988
- 1988-10-05 JP JP24981088A patent/JPH0299584A/en active Pending
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