JPS6241281A - Heat storing material composition - Google Patents

Abstract

PURPOSE:To obtain a heat storing material compsn, which enables the freezing point to be freely selected over a wide range without causing the lowering in the amount of latent heat, by adding a hydrous manganese monohydrogen phosphate to CaCl2-6H2O. CONSTITUTION:A hydrous manganese monohydrogen phosphate is added as a freezing point modifier to a heat storing material compsn. contg. CaCl2.6H2O, a thickener (e.g., glycerin) and a nucleating promoter (e.g., SrCl.6H2O). This enables the latent heat generating temp. to be freely controlled in the range of 15-29 deg.C and provides a heat storing material compsn. having a high level of heat storing performance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heat storage material composition, in particular, it contains calcium chloride hexahydrate as a main component and contains a specific phosphoric acid compound as a freezing point regulator. The present invention relates to a heat storage material composition whose freezing point can be adjusted to any desired temperature over a wide range.

[Prior art] Calcium chloride hexahydrate has a large latent heat of solidification and fusion unique to hydrates, and has a freezing point near room temperature (approximately 30°C), so it is suitable for greenhouse horticulture and cultivation. It is beginning to be widely put into practical use in greenhouses, home heating, chemical heat pumps, solar heat storage tanks, industrial waste heat recovery equipment, etc. However, in the case of calcium chloride hexahydrate alone, the latent heat generation temperature is specified at one point, which is the freezing point (and melting point) of about 30°C. Therefore, in order to make it possible to change the latent heat generation temperature according to the usage environment, research has been carried out to arbitrarily adjust the freezing point by adding freezing point regulators. Calcium bromide hexahydrate, calcium bromide hexahydrate, zinc chloride,
Ferric chloride hexahydrate salt.

Various compounds are known, such as cupric chloride dihydrate, magnesium chloride hexahydrate, and cobalt chloride hexahydrate. By the way, the properties required of a freezing point regulator are: 1) the ability to arbitrarily adjust the freezing point even with a small amount added, 2) a large amount of latent heat at the freezing point, 2) the ability to adjust the freezing point over a wide temperature range, etc.

[Problems to be Solved by the Invention] However, in general, when a freezing point regulator is added, there is a tendency to lower the latent heat of solidification-fusion, and this tendency becomes more pronounced as the amount of the coagulant added increases.
However, with the above-mentioned known freezing point regulators, if the freezing point is to be sufficiently lowered, a considerable amount must be added, and therefore the amount of latent heat must be significantly reduced. In other words, when using conventional freezing point regulators, if you want to freely set the latent heat generation temperature according to the usage environment, you have to sacrifice the inherent performance of heat storage materials, which is reducing the amount of latent heat. The present invention was developed under these circumstances. The aim is to provide a heat storage material composition with excellent practical performance by searching for a coagulation regulator that can arbitrarily adjust the freezing point without significantly reducing the amount of heat.

[Means for Solving the Problems] The gist of the present invention is that hydrous monohydrogen manganese phosphate is contained as a freezing point depressant.

[Function] The greatest feature of the present invention is that an appropriate amount of hydrated l-hydrogen manganese phosphate, which is a phosphoric acid compound, is added as a freezing point regulator for calcium chloride hexahydrate.

As a result, the freezing point can be arbitrarily adjusted over a wide range even with a relatively small blending ratio of the freezing point regulator, and the effect of adding a small amount is sufficient to minimize the decrease in latent heat due to freezing point depression. The advantage is that it can be suppressed. Furthermore, the phosphoric acid compound selected by the inventor forms a eutectic mixture with calcium chloride hexahydrate, which is the main ingredient, and causes a very stable solidification-melting phase transition, so it is said to have excellent repeated stability. It also exhibits characteristics. That is, the phosphoric acid compound selected in the present invention has a greater freezing point lowering effect than conventional freezing point regulators, as will be made clear in the examples below, and its blending also reduces the latent heat amount of the heat storage material composition as a whole. Therefore, by adjusting the blending amount, the latent heat generation temperature can be freely controlled within the range of about 15 to 29 ° C.
A heat storage material having a high level of heat storage property can be obtained.

The heat storage material composition of the present invention has calcium chloride 6 as described above.
It contains water salt and a specific freezing point regulator as essential components, but if necessary, appropriate amounts of thickeners, nucleation accelerators, etc. can also be blended. That is, the thickener has the function of maintaining the freezing point regulator, nucleation accelerator, etc. in a stable dispersed state in the liquid heat storage material composition, and also prevents phase separation caused by the difference in specific gravity between solid and liquid. A typical thickener includes, but is not limited to, glycerin.

Nucleation accelerators are added to prevent supercooling that occurs when the temperature is lowered from the freezing point or higher; for example, 5rC1/6H20, S r (
OH)2 @8H20 or Ba (OH)208H20
etc. are used.

[Example] Figure 1 below shows the relationship between the content of the freezing point regulator of the present invention [content (% by weight) in the total amount of the heat storage material composition containing calcium chloride hexahydrate as the main ingredient] and the freezing point, This will be explained in more detail. Figure 1 is! 2 is a graph showing the relationship between content and freezing point when manganese monohydrogen phosphate hydrate is added as a solid point regulator. The heat storage material composition shown in FIG.
It contains 3% by weight of glycerin as a thickener, so even if the amount of freezing point regulator added is almost zero, it is unavoidable that the freezing point of the heat storage material composition will be about 25°C.

As can be understood from Fig. 1, by adding an appropriate amount of mangayl monohydrogen phosphate (M n HP O4'', ) 120) to a heat storage material composition whose main ingredient is calcium chloride hexahydrate, the freezing point can be lowered. can be adjusted to any temperature over a wide range.Also, as is clear from Fig. 1, M n
The preferred amount of HP O40H20 is 0.3 to 30% by weight
That's about it. In other words, if the blending amount of MnHPOt・H2O is too large, the absolute amount of calcium chloride hexahydrate will decrease, the heat generation value will decrease, and the performance as a heat storage material will be inhibited. The freezing point regulator of the present invention is not sufficiently effective as a M n H
The material is not limited to P Ot·H2O, but may also be manganese monohydrogen phosphate trihydrate (MnHPOa a3H20). In that case, it is sufficient to add an amount that satisfies FIG. 1 in terms of anhydrous manganese hydrogen phosphate.

However, it is unsuitable to add anhydrous manganese hydrogen phosphate as a freezing point regulator because it will incorporate moisture in the heat storage material composition.

Next, what has been stated above will be further explained comprehensively using Table 1. Table 1 shows M n which is the freezing point regulator of the present invention.
For HP O4/H2O and typical conventional products (11! zinc oxide, ferric chloride hexahydrate), the amount of addition required to set the freezing point to 20°C and the amount of latent heat at the freezing point are shown. .

Table 1 As is clear from Table 1, the freezing point regulator according to the present invention is
Smaller addition amount compared to conventional products (especially FeCl3 Φ6
Compared to H20, the desired freezing point can be obtained even at a temperature of about 173), and the amount of latent heat at this temperature is higher than that of conventional formulations.

That is, the heat storage material composition containing the freezing point regulator according to the present invention can arbitrarily adjust the freezing point while ensuring a high level of latent heat.

As described above, the present invention is characterized in that hydrated manganese monohydrogen phosphate is contained in the heat storage material composition containing calcium chloride hexahydrate as the main component. It is also effective to contain appropriate amounts of thickeners, nucleating agents, etc., and specific formulation examples of heat storage material compositions containing these are as follows.

Prescription example 1 Calcium chloride hexahydrate: 89.5% Manganese monohydrogen phosphate 1 hydrate Strontium chloride: 0.5% Prescription example 2 Calcium chloride hexahydrate: 86.179% Manganese monohydrogen phosphate 1 hydrate : 10% Glycerin = 3% Barium sulfide: o, oot% Barium chloride dihydrate: 0.82% [Effects of the invention] The present invention is configured as described above, and a specific compound is used in an appropriate amount as a freezing point regulator. By adding it, the freezing point of the heat storage material composition can be arbitrarily set over a relatively wide range, and furthermore, the decrease in the amount of latent heat due to the lowering of the freezing point can be minimized.

[Brief explanation of drawings]

Figure 1 shows M n HF O4.82 as a freezing point regulator.
It is a graph which shows the relationship between the addition amount and freezing point when using 0.

Claims (1)

[Claims] A heat storage material composition containing calcium chloride hexahydrate as a main component and containing hydrous monohydrogen manganese phosphate.