WO2015163236A1 - 蓄熱材 - Google Patents
蓄熱材 Download PDFInfo
- Publication number
- WO2015163236A1 WO2015163236A1 PCT/JP2015/061735 JP2015061735W WO2015163236A1 WO 2015163236 A1 WO2015163236 A1 WO 2015163236A1 JP 2015061735 W JP2015061735 W JP 2015061735W WO 2015163236 A1 WO2015163236 A1 WO 2015163236A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- heat storage
- storage material
- preservative
- aqueous solution
- freezer
- Prior art date
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
Definitions
- the present invention relates to a heat storage material, and more particularly to a heat storage material suitable for cold storage in a freezer.
- Patent Document 1 describes a heat storage material that uses sodium sulfate decahydrate and is suitable for air conditioning.
- the heat storage material described in Patent Document 1 contains a preservative to prevent corruption.
- a preservative sodium benzoate or butylhydroxyl toluene is used.
- these preservatives do not increase the amount of latent heat (heat storage amount) of a thermal storage material.
- the heat storage material described in Patent Document 1 has a problem that the heat storage performance is not improved for the manufacturing cost for the use of the preservative.
- An object of the present invention is to provide a heat storage material having an antiseptic function and improved heat storage performance.
- An inorganic salt aqueous solution A heat storage material characterized by having a preservative that is dissolved in the inorganic salt aqueous solution and has a preservative function and increases the phase transition time at the melting point of the inorganic salt aqueous solution.
- the heat storage material of the present invention may be a heat storage material containing at least one of methylchloroisothiazolinone, methylisothiazolinone, or sodium chlorate.
- the heat storage material of the present invention may be characterized in that the concentration of the preservative is 0.05 wt% or more and 0.1 wt% or less.
- the heat storage material of the present invention may be a heat storage material characterized by being a potassium chloride aqueous solution.
- the inorganic salt aqueous solution may be a heat storage material characterized by being a mixed aqueous solution of potassium chloride and potassium hydrogen carbonate.
- the heat storage material of the present invention may be a heat storage material characterized by being an ammonium chloride aqueous solution.
- the refrigerator-freezer characterized by mounting the heat storage material of the present invention may be used.
- it may be a cold storage container equipped with the heat storage material of the present invention.
- a heat storage material having an antiseptic function and improved heat storage performance can be realized.
- the heat storage material according to the present embodiment has an inorganic salt aqueous solution.
- the heat storage material according to the present embodiment is used, for example, for keeping the inside of a freezer or a freezer compartment.
- Thermal storage refers to a technique for temporarily storing heat and extracting the heat as needed.
- Examples of the heat storage method include sensible heat storage, latent heat storage, chemical heat storage, and the like.
- latent heat storage is used.
- Latent heat storage uses the latent heat of a substance to store the thermal energy of the phase change of the substance.
- the latent heat storage has a high heat storage density and a constant output temperature.
- Materials for the heat storage material solution that uses latent heat storage include ice (water), paraffin (a general term for saturated chain hydrocarbons represented by the general formula C n H 2n + 2 ), inorganic salts, inorganic salt hydrates, clathrate water Japanese products are used.
- the heat storage material according to the present embodiment has a melting point of ⁇ 10 ° C. or lower.
- the heat storage material by this Embodiment can be used suitably for the cold storage in a freezer or a freezer compartment.
- fusing point of the thermal storage material by this Embodiment can be adjusted by changing the density
- the heat storage material according to the present embodiment has a preservative in order to prevent corruption.
- the preservative of this embodiment contains at least one of methylchloroisothiazolinone, methylisothiazolinone, or sodium chlorate. Methylchloroisothiazolinone, methylisothiazolinone and sodium chlorate have antiseptic functions. For this reason, since the heat storage material according to the present embodiment has an antiseptic function, it can be used for a long period of time.
- FIG. 1 shows the composition, melting point, and latent heat amount of the heat storage material sample produced in this example.
- the latent heat amount of the heat storage material sample is the latent heat amount of the inorganic salt aqueous solution of the heat storage material sample.
- a heat storage material sample containing no preservative (no preservative) and five heat storage material samples having different preservatives were prepared.
- the potassium chloride aqueous solution which dissolved potassium chloride in the ultrapure water was used for any heat storage material sample.
- the concentration of potassium chloride was 20 wt% in all cases. Further, the concentration of the preservative was set to 0.1 wt%.
- the melting point of the heat storage material sample containing no preservative was -10.6 ° C., and the latent heat amount was 275.796 J / g.
- the heat storage material sample using sodium chlorate as a preservative had a melting point of ⁇ 10.6 ° C. and a latent heat of 303.910 J / g.
- the heat storage material sample in which methylchloroisothiazolinone was used as a preservative had a melting point of -10.8 ° C. and a latent heat amount of 293.781 J / g.
- the heat storage material sample using methylisothiazolinone as a preservative had a melting point of -10.7 ° C.
- the heat storage material sample using the preservative N as the preservative had a melting point of ⁇ 10.6 ° C. and a latent heat of 296.663 J / g.
- the preservative N is prepared by dissolving methylchloroisothiazolinone, methylisothiazolinone and sodium chlorate in ultrapure water with a mass ratio of methylchloroisothiazolinone and methylisothiazolinone of 3: 1. did.
- the concentrations of methylchloroisothiazolinone and methylisothiazolinone were 0.6 wt% to 2.5 wt%, and the concentration of sodium chlorate was 4.0 wt% to 5.0 wt%.
- the latent heat amount is a value measured using an electric cooling type differential scanning calorimeter (Rigaku Corporation thermal analysis system ThermoPlus EVOII).
- the melting point of the heat storage material sample using sodium benzoate as a preservative was -10.5 ° C.
- the amount of latent heat was 265.234 J / g.
- the melting point of the heat storage material sample containing no preservative and the heat storage material sample containing the preservative were almost the same. For this reason, even if these preservatives are dissolved, the melting point of the heat storage material does not change.
- a heat storage material sample using sodium chlorate, methylchloroisothiazolinone, methylisothiazolinone or preservative N as a preservative has a latent heat amount of about 18 J / g than a heat storage material sample containing no preservative. It has increased by about 28 J / g.
- Preservative N is a mixture of sodium chlorate, methylchloroisothiazolinone and methylisothiazolinone.
- the heat storage material using either sodium chlorate, methylchloroisothiazolinone or methylisothiazolinone as a preservative increases the latent heat amount of the inorganic salt aqueous solution, and improves the heat storage performance. I found it.
- the heat storage material sample using sodium benzoate as a preservative has a latent heat amount reduced by about 10 J / g as compared with the heat storage material sample not containing the preservative. For this reason, since sodium benzoate cannot raise the effect of the heat storage performance of the heat storage material, it is not suitable as a preservative for the heat storage material.
- the lower limit of the preservative for obtaining the antiseptic function was determined by the following simple test.
- preservative N was used as a preservative.
- General agar medium (medium suitable for general bacterial growth)
- Dezoxycholate medium medium suitable for growth of E.
- the sample containing 0.05 wt% or more of the preservative N was able to prevent mold generation.
- the lower limit of the preservative for obtaining the antiseptic function was set to 0.05 wt%.
- the heat storage material according to this example has an inorganic salt aqueous solution and a preservative that is dissolved in the inorganic salt aqueous solution and has a preservative function and increases the latent heat amount of the inorganic salt aqueous solution.
- the inorganic salt aqueous solution is a potassium chloride aqueous solution.
- the concentration of potassium chloride is 20 wt%. Since the heat storage material according to the present example has a melting point of about ⁇ 11 ° C., it can be suitably used for keeping the inside of the freezer or the freezer compartment.
- the preservative contains at least one of methylchloroisothiazolinone, methylisothiazolinone or sodium chlorate.
- Methylchloroisothiazolinone, methylisothiazolinone and sodium chlorate have antiseptic functions. Since the heat storage material according to this embodiment has an antiseptic function, it can be used for a long time. Moreover, the heat storage material according to the present embodiment can improve the heat storage performance by increasing the latent heat amount of the inorganic salt aqueous solution.
- Example 2 Next, the heat storage material according to Example 2 of the present embodiment will be described with reference to FIGS.
- a heat storage material sample containing no preservative and a heat storage material sample containing the preservative N were prepared.
- the potassium chloride aqueous solution which dissolved potassium chloride in the ultrapure water was used for any heat storage material sample.
- the concentration of potassium chloride was 20 wt%.
- the concentration of the preservative N was 0.05 wt%.
- 50 g of the two heat storage material samples produced were filled in a polypropylene cylindrical container, cooled in a freezer of a freezer refrigerator for 18 hours, and frozen.
- the temperature in the freezer was about -21 ° C.
- the refrigerator was turned off, and the temperatures in the freezer and the two heat storage material samples were measured.
- the polystyrene foam was arrange
- FIG. 2 is a graph showing temperature changes in the freezer and two heat storage material samples.
- the vertical axis in FIG. 2 represents temperature (° C.), and the horizontal axis represents time (hour).
- the curve indicated by the broken line indicates the temperature change of the heat storage material sample (KCl — 20 wt%) not containing the preservative
- the curve indicated by the solid line indicates the heat storage material sample including the preservative N (KCl — 20 wt% + preservative).
- N_0.05 wt%) indicates a temperature change in the freezer.
- FIG. 3 shows an enlarged view from 4 to 6 hours in FIG.
- the temperature inside the freezer begins to rise, so the temperature of the two heat storage material samples begins to rise.
- the two heat storage material samples reached a melting point of about ⁇ 11 ° C., and phase change from a solid phase to a liquid phase has started.
- the temperature of the heat storage material sample during the phase change is constant at about ⁇ 11 ° C., which is the melting point.
- the heat storage material sample not containing the preservative finished the phase change to the liquid phase after about 4.7 hours and started to rise in temperature again.
- the heat storage material sample containing the preservative N has finished the phase change to the liquid phase after about 5.6 hours and has started to rise in temperature again.
- the heat storage material sample containing the preservative N has a longer time (phase transition time) required for the phase change from the solid phase to the liquid phase than the heat storage material sample not containing the preservative. ing.
- the heat storage material containing the preservative N can be kept cool to the melting point longer than the heat storage material containing no preservative. This is because the heat storage material containing the preservative N has a larger latent heat amount than the heat storage material not containing the preservative N, as shown in FIG.
- the heat storage material according to this example has an aqueous potassium chloride solution and an antiseptic N that is dissolved in the aqueous potassium chloride solution and has a preservative function and increases the latent heat amount of the aqueous potassium chloride solution.
- the concentration of potassium chloride is 20 wt%.
- the preservative N is a mixture of methylchloroisothiazolinone, methylisothiazolinone and sodium chlorate.
- the heat storage material having the preservative N of 0.05 wt% or more has an antiseptic function. For this reason, the heat storage material according to the present embodiment can be used for a long time. Moreover, the heat storage material according to the present embodiment can increase the amount of latent heat of the potassium chloride aqueous solution, lengthen the phase transition time at the melting point, and improve the heat storage performance.
- Example 3 Next, the heat storage material according to Example 3 of the present embodiment will be described with reference to FIGS. 4 and 5.
- a heat storage material sample containing no preservative and four heat storage material samples having different concentrations of the preservative N were prepared.
- the concentration of the preservative N was 0.1 wt%, 1.0 wt%, 5.0 wt%, 10.0 wt%.
- the potassium chloride aqueous solution which dissolved potassium chloride in the ultrapure water was used for any heat storage material sample.
- the concentration of potassium chloride was 20 wt%.
- 50 g of the prepared five heat storage material samples were filled in a polypropylene cylindrical container, cooled in a freezer of a freezer refrigerator for 15 hours, and frozen.
- the temperature in the freezer was about ⁇ 20 ° C.
- the refrigerator was turned off, and the temperatures in the freezer and the five heat storage material samples were measured.
- foamed polystyrene was disposed between the containers of the respective heat storage material samples. The temperature at the place where the refrigerator was installed was about 26 ° C.
- FIG. 4 is a graph showing temperature changes in the freezer and five heat storage material samples.
- the vertical axis in FIG. 4 represents temperature (° C.), and the horizontal axis represents time (hour).
- the curve indicated by the solid line indicates the temperature change of the heat storage material sample (KCl — 20 wt%) that does not include the preservative
- the curve indicated by the dotted line indicates the heat storage material in which the concentration of the preservative N is 0.1 wt%.
- the temperature change of the sample (KCl_20 wt% + preservative N_0.1 wt%) is shown, and the curve indicated by the short dashed line of the pitch is the heat storage material sample (KCl_20 wt% + preservative N_1.0 wt) where the concentration of the preservative N is 1.0 wt%. %), And the curve indicated by the alternate long and short dash line indicates the temperature change of the heat storage material sample (KCl — 20 wt% + preservative N — 5.0 wt%) with the concentration of the preservative N being 5.0 wt%, and has a long dotted line.
- the curve indicated by indicates the temperature change of the heat storage material sample (KCl — 20 wt% + preservative N — 10.0 wt%) in which the concentration of the preservative N is 10.0 wt%. Curve shown represents the temperature change in the freezer.
- FIG. 5 shows an enlarged view from 5 to 7 hours in FIG.
- the temperature inside the freezer begins to rise, so the temperature of the five heat storage material samples begins to rise.
- the temperature of the heat storage material sample not containing the preservative and the temperature of the heat storage material sample having the concentration of the preservative N of 0.1 wt% reached about ⁇ 11 ° C., from the solid phase to the liquid phase.
- the phase change has begun.
- the temperature of the heat storage material sample having the concentration of the preservative N of 1.0 wt% reached about ⁇ 11 ° C., and this heat storage material sample undergoes a phase change from the solid phase to the liquid phase. Has started.
- the temperature of the heat storage material sample having the preservative N concentration of 5.0 wt% and the temperature of the heat storage material sample having the preservative N concentration of 10.0 wt% reached about ⁇ 11 ° C.
- the phase change from the solid phase to the liquid phase has started.
- the temperature of the heat storage material sample during the phase change is constant at about ⁇ 11 ° C., which is the melting point.
- concentration of the preservative N is 5.0 wt% are the phases to a liquid phase after about 5.7 hours progress. The change is over and the temperature starts to rise again. Further, the heat storage material sample having the concentration of the preservative N of 10.0 wt% has finished the phase change to the liquid phase after about 5.9 hours and has started to rise in temperature again. In addition, the heat storage material sample having the concentration of the preservative N of 1.0 wt% has finished the phase change to the liquid phase after about 6.0 hours and has started to rise in temperature again. In addition, the heat storage material sample having the concentration of the preservative N of 0.1 wt% has finished the phase change to the liquid phase after about 6.5 hours and has started to rise in temperature again.
- the phase transition time of the heat storage material sample having the lowest preservative N concentration of 0.1 wt% is the longest compared to the other heat storage material samples.
- the upper limit value of the preservative N is desirably 0.1 wt%.
- the heat storage material according to this example has a potassium chloride aqueous solution and a preservative that is dissolved in the potassium chloride aqueous solution and has a preservative function and increases the latent heat amount of the potassium chloride aqueous solution.
- the concentration of potassium chloride is 20 wt%.
- the preservative N is a mixture of methylchloroisothiazolinone, methylisothiazolinone and sodium chlorate.
- the heat storage material having the preservative N of 0.05 wt% or more has an antiseptic function. For this reason, the heat storage material according to the present embodiment can be used for a long time. Moreover, the heat storage material according to the present embodiment can increase the amount of latent heat of the potassium chloride aqueous solution, lengthen the phase transition time at the melting point, and improve the heat storage performance.
- Example 4 Next, a heat storage material according to Example 4 of the present embodiment will be described with reference to FIGS.
- a heat storage material sample containing no preservative and four heat storage material samples having different concentrations of the preservative N were prepared.
- the concentration of the preservative N was set to 0.05 wt%, 0.1 wt%, 0.5 wt%, and 1.0 wt%.
- the potassium chloride aqueous solution which dissolved potassium chloride in the ultrapure water was used for any heat storage material sample.
- the concentration of potassium chloride was 20 wt%.
- 50 g of the prepared five heat storage material samples were filled into a cylindrical cylindrical container, cooled in a freezer of a freezer refrigerator for 18 hours, and frozen.
- the temperature in the freezer was about ⁇ 20 ° C.
- the refrigerator was turned off, and the temperatures in the freezer and the five heat storage material samples were measured.
- foamed polystyrene was disposed between the containers of the respective heat storage material samples. The temperature at the place where the refrigerator was installed was about 26 ° C.
- FIG. 6 is a graph showing temperature changes in the freezer and five heat storage material samples.
- the vertical axis in FIG. 6 represents temperature (° C.), and the horizontal axis represents time (hour).
- the curve indicated by the solid line indicates the temperature change of the heat storage material sample (KCl — 20 wt%) not containing the preservative, and the curve indicated by the dotted line indicates the heat storage material where the concentration of the preservative N is 0.05 wt%.
- the temperature change of the sample (KCl — 20 wt% + preservative N — 0.05 wt%) is shown, and the curve indicated by the short dashed line of the pitch is the heat storage material sample (KCl — 20 wt% + preservative N — 0.1 wt%) where the concentration of the preservative N is 0.1 wt% %), And the curve indicated by the alternate long and short dash line shows the temperature change of the heat storage material sample (KCl — 20 wt% + preservative N — 0.5 wt%) having a preservative N concentration of 0.5 wt%, and has a long pitch.
- the curve indicated by indicates the temperature change of the heat storage material sample (KCl — 20 wt% + preservative N — 1.0 wt%) in which the concentration of the preservative N is 1.0 wt%. Curve shown represents the temperature change in the freezer.
- FIG. 7 shows an enlarged view from 5 to 7 hours in FIG.
- the temperature inside the freezer begins to rise, so the temperature of the five heat storage material samples begins to rise.
- a heat storage material sample containing no preservative, a heat storage material sample having a preservative N concentration of 0.05 wt%, and a heat storage material sample having a preservative N concentration of 0.1 wt% Has reached about ⁇ 11 ° C., and the phase change from the solid phase to the liquid phase has started.
- the temperature of the heat storage material sample having the preservative N concentration of 0.5 wt% and the temperature of the heat storage material sample having the preservative N concentration of 1.0 wt% reached about ⁇ 11 ° C.
- the phase change from the solid phase to the liquid phase has started.
- the temperature of the heat storage material sample during the phase change is constant at about ⁇ 11 ° C., which is the melting point.
- the heat storage material sample not containing the preservative finished the phase change to the liquid phase after about 5.5 hours and started to rise in temperature again.
- the heat storage material sample having the concentration of the preservative N of 1.0 wt% has finished the phase change to the liquid phase after about 6.0 hours and has started to rise in temperature again.
- the heat storage material sample having the concentration of the preservative N of 0.5 wt% has finished the phase change to the liquid phase after about 6.3 hours and has started to rise in temperature again.
- the heat storage material sample having the concentration of the preservative N of 0.1 wt% has finished the phase change to the liquid phase after about 6.1 hours and has started to rise in temperature again.
- the heat storage material sample having the concentration of the preservative N of 0.05 wt% has finished the phase change to the liquid phase after about 6.5 hours and has started to rise in temperature again.
- the phase transition time of the heat storage material sample having the concentration of the preservative N of 0.05 wt% is the longest compared to the other heat storage material samples. Further, when the concentration of the preservative N is 0.5 wt% or more, the phase transition time of the heat storage material sample is relatively short.
- the heat storage material sample in which the concentration of the preservative N is 0.1 wt% has a longer time to be kept at ⁇ 10 ° C. or less next to the heat storage material sample in which the concentration of the preservative N is 0.05 wt%. For this reason, in order to increase the latent heat amount of the inorganic salt aqueous solution, the upper limit value of the preservative N is desirably 0.1 wt%.
- the heat storage material according to this example has an aqueous potassium chloride solution and an antiseptic N that is dissolved in the aqueous potassium chloride solution and has a preservative function and increases the latent heat amount of the aqueous potassium chloride solution.
- the concentration of potassium chloride is 20 wt%.
- the preservative N is a mixture of methylchloroisothiazolinone, methylisothiazolinone and sodium chlorate.
- the heat storage material having the preservative N of 0.1 wt% has an antiseptic function. For this reason, the heat storage material according to the present embodiment can be used for a long time. Moreover, the heat storage material according to the present embodiment can increase the amount of latent heat of the potassium chloride aqueous solution, lengthen the phase transition time at the melting point, and improve the heat storage performance.
- Example 5 a heat storage material according to Example 5 of the present embodiment will be described with reference to FIGS.
- a heat storage material sample containing no preservative and a heat storage material sample containing the preservative N were prepared.
- a mixed aqueous solution in which potassium chloride and potassium hydrogen carbonate were dissolved in tap water (Sakai City Waterworks Bureau, Chiba Prefecture) was used for each heat storage material sample.
- the concentration of potassium chloride was 20 wt%, and the concentration of potassium bicarbonate was 5.0 wt%.
- the melting point of the heat storage material sample of this example is about ⁇ 12 ° C.
- the concentration of the preservative N was 0.1 wt%.
- 50 g of the two heat storage material samples produced were filled in a polypropylene cylindrical container, cooled in a freezer of a freezer refrigerator for 18 hours, and frozen.
- the temperature in the freezer was about -28 ° C.
- the refrigerator was turned off, and the temperatures in the freezer and the two heat storage material samples were measured.
- the polystyrene foam was arrange
- FIG. 8 is a graph showing temperature changes in the freezer and two heat storage material samples.
- the vertical axis in FIG. 8 represents temperature (° C.), and the horizontal axis represents time (hour).
- the curve shown with a broken line shows the temperature change of the heat storage material sample (KCl — 20 wt% + KHCO 3 —5 wt%) not containing the preservative
- the curve shown with a solid line shows the heat storage material sample containing the preservative N (KCl — 20 wt. % + KHCO 3 _5 wt% + preservative N_0.1 wt%), and a curve indicated by a two-dot chain line indicates a temperature change in the freezer.
- FIG. 9 is an enlarged view from 6 hours to 8 hours of FIG.
- the temperature inside the freezer begins to rise, so the temperature of the two heat storage material samples begins to rise.
- the two heat storage material samples reached a melting point of about ⁇ 12 ° C., and started a phase change from a solid phase to a liquid phase.
- the temperature of the heat storage material sample during the phase change is constant at about ⁇ 12 ° C., which is the melting point.
- the heat storage material sample not containing the preservative finished the phase change to the liquid phase after about 6.6 hours and started to rise in temperature again. Further, the heat storage material sample containing the preservative N has finished the phase change to the liquid phase after about 6.9 hours, and the temperature starts to rise again.
- the heat storage material sample containing the preservative N has a longer phase transition time from the solid phase to the liquid phase of about 0.3 hours than the heat storage material sample containing no preservative. This is because the heat storage material containing the preservative N has a larger amount of latent heat than the heat storage material containing no preservative, as in Examples 1 to 4. For this reason, the heat storage material containing the preservative N can be kept cool to the melting point longer than the heat storage material containing no preservative.
- the heat storage material according to this example has an inorganic salt aqueous solution and a preservative that is dissolved in the inorganic salt aqueous solution and has a preservative function and increases the latent heat amount of the inorganic salt aqueous solution.
- the inorganic salt aqueous solution is a mixed aqueous solution of potassium chloride aqueous solution and potassium hydrogen carbonate.
- concentration of potassium chloride is 20 wt% and the density
- the preservative N is a mixture of methylchloroisothiazolinone, methylisothiazolinone and sodium chlorate.
- the heat storage material having the preservative N of 0.1 wt% has an antiseptic function. For this reason, the heat storage material according to the present embodiment can be used for a long time. Moreover, the heat storage material according to the present embodiment can increase the amount of latent heat of the inorganic salt aqueous solution, lengthen the phase transition time at the melting point, and improve the heat storage performance. Moreover, even if the city water (tap water) used for drinking is used for a heat storage material, these effects are recognized.
- Example 6 a heat storage material according to Example 6 of the present embodiment will be described with reference to FIGS. 10 and 11.
- a heat storage material sample containing no preservative and a heat storage material sample containing the preservative N were prepared.
- an inorganic salt aqueous solution in which ammonium chloride was dissolved in ultrapure water was used for each heat storage material sample.
- the concentration of ammonium chloride was 20 wt%.
- the melting point of the heat storage material sample of this example is about ⁇ 16 ° C.
- the concentration of the preservative N was 0.1 wt%.
- 50 g of the two heat storage material samples produced were filled in a polypropylene cylindrical container, cooled in a freezer of a freezer refrigerator for 18 hours, and frozen.
- the temperature in the freezer was about -28 ° C.
- the refrigerator was turned off, and the temperatures in the freezer and the two heat storage material samples were measured.
- the polystyrene foam was arrange
- FIG. 10 is a graph showing temperature changes in the freezer and two heat storage material samples.
- the vertical axis in FIG. 10 represents temperature (° C.), and the horizontal axis represents time (hour).
- the curve indicated by the broken line indicates the temperature change of the heat storage material sample (NH 4 Cl — 20 wt%) that does not include the preservative
- the curve indicated by the solid line indicates the heat storage material sample (NH 4 Cl — 20 wt including the preservative N).
- a curve indicated by a two-dot chain line indicates a temperature change in the freezer.
- FIG. 11 is an enlarged view from 5 hours to 7 hours of FIG.
- the temperature inside the freezer begins to rise, so the temperature of the two heat storage material samples begins to rise. Further, after about 1.5 hours, the two heat storage material samples reach the melting point of about ⁇ 16 ° C., and the phase change from the solid phase to the liquid phase is started.
- the temperature of the heat storage material sample during the phase change is constant at about ⁇ 16 ° C., which is the melting point.
- the heat storage material sample not containing the preservative finished the phase change to the liquid phase after about 5.2 hours and started to rise in temperature again.
- the heat storage material sample containing the preservative N has finished the phase change to the liquid phase after about 6.4 hours and has started to rise in temperature again.
- the heat storage material sample containing the preservative N has a longer phase transition time from the solid phase to the liquid phase of about 0.8 hours than the heat storage material sample containing no preservative. This is because the heat storage material containing the preservative N has a larger amount of latent heat than the heat storage material containing no preservative, as in Examples 1 to 5. For this reason, the heat storage material containing the preservative N can be kept cool to the melting point longer than the heat storage material containing no preservative.
- the heat storage material according to this example has an ammonium chloride aqueous solution and a preservative that is dissolved in the ammonium chloride aqueous solution and has a preservative function and increases the latent heat amount of the ammonium chloride aqueous solution.
- the concentration of ammonium chloride is 20 wt%.
- the preservative N is a mixture of methylchloroisothiazolinone, methylisothiazolinone and sodium chlorate.
- the heat storage material having the preservative N of 0.1 wt% has an antiseptic function. For this reason, the heat storage material according to the present embodiment can be used for a long time. Moreover, the heat storage material according to the present embodiment can increase the amount of latent heat of the inorganic salt aqueous solution, lengthen the phase transition time at the melting point, and improve the heat storage performance.
- Example 7 a heat storage material according to Example 7 of the present embodiment will be described with reference to FIG.
- the heat storage material according to the present embodiment has a potassium chloride aqueous solution that is a main component of the heat storage material, and a preservative N dissolved in the potassium chloride aqueous solution.
- 600 g of the heat storage material according to this example was filled in a blow container having a rectangular parallelepiped shape having a height of 24 cm, a width of 25 cm, and a height of 1.5 cm, and placed on the shelf in the center of the freezer of the freezer refrigerator (Sharp Kirei SJ-225MF). .
- the power supply of the refrigerator-freezer was turned off and the temperature change in the heat storage material and the freezer was measured.
- the temperature of the blow container surface containing a heat storage material was measured with the thermocouple, and the temperature change of the heat storage material was measured.
- the temperature in the freezer after power-off when the heat storage material was not mounted was measured for comparison.
- FIG. 12 is a graph showing temperature changes in the heat storage material and the freezer.
- the vertical axis in FIG. 12 represents temperature (° C.), and the horizontal axis represents time (minutes).
- the curve shown with a dashed-dotted line shows the temperature change in the freezer when the heat storage material is mounted (the temperature inside the storage room with the heat storage material)
- the curve shown by the solid line shows the temperature change of the heat storage material
- a curve indicated by a dotted line indicates a temperature change in the freezer when the heat storage material is not mounted (the temperature inside the storage room without the heat storage material).
- the heat storage material starts a phase change from a solid phase to a liquid phase after about 120 minutes, and starts cooling by latent heat endotherm while maintaining about ⁇ 9 ° C.
- the temperature inside the freezer gradually rises after about 120 minutes.
- the heat storage material finishes the phase change from the solid phase to the liquid phase after about 420 minutes, and finishes cooling by latent heat absorption.
- the freezer temperature rises to about 0 ° C. after about 420 minutes.
- the temperature in the freezer when the heat storage material is not mounted rises to 0 ° C. or more after about 120 minutes.
- the refrigerator-freezer equipped with the heat storage material according to the present embodiment can keep the freezer temperature at 0 ° C. or lower for 420 minutes (7 hours) after the power is turned off.
- the refrigerator-freezer which mounts the heat storage material by a present Example can keep cold-reserved things, such as a foodstuff, at 0 degrees C or less for a long time even if the time of a power failure etc. arises.
- the heat storage material is arranged only on the shelf in the freezer.
- the heat storage material may be arranged in the freezer as well as on the wall and ceiling. Thereby, the cool time at 0 degrees C or less can be made longer.
- the heat storage material according to the present embodiment may be mounted in a cold storage container such as a cooler box.
- the cold storage container equipped with the heat storage material according to the present embodiment can keep the cold storage such as food at 0 ° C. or lower for a long time.
- the present invention is not limited to the above embodiment, and various modifications can be made.
- the heat storage material according to the above embodiment may have a supercooling inhibitor.
- a supercooling inhibitor sodium tetraborate (anhydride, pentahydrate, decahydrate) or disodium hydrogen phosphate can be used.
- the heat storage material according to the above embodiment may be gelled.
- the gelling agent for gelling the heat storage material include synthetic polymers, natural polysaccharides, gelatin, and the like using molecules having at least one hydroxyl group or carboxyl group, sulfonic acid group, amino group, or amide group. It is done.
- the synthetic polymer include polyacrylamide derivatives, polyvinyl alcohol, polyacrylic acid derivatives, and the like.
- natural polysaccharides include agar, alginic acid, fercellan, pectin, starch, a mixture of xanthan gum and locust bean gum, tamarind seed gum, julan gum, carrageenan and the like. Although these are mentioned as an example of a gelatinizer, the gelatinizer which gelatinizes a thermal storage material is not limited to these.
- the present invention can be widely used in a heat storage material for cold storage in a freezer.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
Abstract
Description
無機塩水溶液と、
前記無機塩水溶液に溶解され、防腐機能を備えるとともに前記無機塩水溶液の融点での相転移時間を増加させる防腐剤とを有すること
を特徴とする蓄熱材であってもよい。
前記防腐剤は、メチルクロロイソチアゾリノン、メチルイソチアゾリノン又は塩素酸ナトリウムの少なくもいずれか一つを含むこと
を特徴とする蓄熱材であってもよい。
前記防腐剤の濃度は、0.05wt%以上、0.1wt%以下であること
を特徴とする蓄熱材であってもよい。
前記無機塩水溶液は、塩化カリウム水溶液であること
を特徴とする蓄熱材であってもよい。
前記無機塩水溶液は、塩化カリウム及び炭酸水素カリウムの混合水溶液であること
を特徴とする蓄熱材であってもよい。
前記無機塩水溶液は、塩化アンモニウム水溶液であること
を特徴とする蓄熱材であってもよい。
次に、本実施の形態の実施例1による蓄熱材について図1を用いて説明する。図1は、本実施例において作製した蓄熱材サンプルの組成、融点及び潜熱量を示している。蓄熱材サンプルの潜熱量は、当該蓄熱材サンプルの無機塩水溶液の潜熱量である。本実施例では、防腐剤を含まない(防腐剤なし)蓄熱材サンプルと、防腐剤の異なる5つの蓄熱材サンプルとを作製した。また、いずれの蓄熱材サンプルにも超純水に塩化カリウムを溶解させた塩化カリウム水溶液を用いた。また、塩化カリウムの濃度はいずれも20wt%とした。また、防腐剤の濃度はいずれも0.1wt%とした。
<簡易試験仕様>
(1)菌株;
一般屋外環境下で自然発生させたカビ菌を用いる。
なお、カビ種判定、耐性の有無、培地適用性などは一切問わない。
(2)培地;
培養用の寒天培地は次の2種とする。
一般寒天培地(一般細菌等の増殖に向く培地)
デゾキシコレート培地(大腸菌等の増殖に向く培地)
(3)接種;
上記菌株より適量(約2mg)のカビを採取し、10mlの精製水(超純水)が入った所定容器に採取したカビを投入して攪拌したものを接種液原液とする。菌糸数の計測等はしない。
各試料10mlに対し0.1mlの割合で接種液原液を接種して、よく攪拌する。
精製水に上記と同様にカビを接種したものをリファレンスとする。
(4)接種→培地移植までの保持時間条件;
上記(3)の接種後、室温で保持し、接種後時間0.5分(30秒)、1分、5分および10分ごとに攪拌液1mlをピペットで採取して培地シャーレに移植する。これは、即時抗菌能(接種後速やかに抗菌作用を発する)と経時抗菌能(抗菌能を発するまでにある程度の時間を要する)を評価するためである。
リファレンスの保持時間条件は、0.5分(30秒)のみ(抗菌性なし)とする。
(5)培養
36℃恒温槽内において24時間安置する。
(6)抗カビ性評価
培養培地の発カビ状況を目視検査とし、菌数計測・増殖菌種の判別はしない。
全検液の培養試験後の外観写真を撮影して記録する(2試料シャーレ並列/視野)。
リファレンスの発カビ状況も外観撮影する。
次に、本実施の形態の実施例2による蓄熱材について図2及び図3を用いて説明する。本実施例では、防腐剤を含まない蓄熱材サンプルと、防腐剤Nを含む蓄熱材サンプルとを作製した。また、いずれの蓄熱材サンプルにも超純水に塩化カリウムを溶解させた塩化カリウム水溶液を用いた。また、塩化カリウムの濃度は20wt%とした。また、防腐剤Nの濃度は、0.05wt%とした。
次に、本実施の形態の実施例3による蓄熱材について図4及び図5を用いて説明する。本実施例では、防腐剤を含まない蓄熱材サンプルと、防腐剤Nの濃度が異なる4つの蓄熱材サンプルとを作製した。防腐剤Nの濃度は、0.1wt%、1.0wt%、5.0wt%、10.0wt%とした。また、いずれの蓄熱材サンプルにも超純水に塩化カリウムを溶解させた塩化カリウム水溶液を用いた。また、塩化カリウムの濃度は20wt%とした。
次に、本実施の形態の実施例4による蓄熱材について図6及び図7を用いて説明する。本実施例では、防腐剤を含まない蓄熱材サンプルと、防腐剤Nの濃度が異なる4つの蓄熱材サンプルとを作製した。防腐剤Nの濃度は、0.05wt%、0.1wt%、0.5wt%、1.0wt%とした。また、いずれの蓄熱材サンプルにも超純水に塩化カリウムを溶解させた塩化カリウム水溶液を用いた。また、塩化カリウムの濃度は20wt%とした。
次に、本実施の形態の実施例5による蓄熱材について図8及び図9を用いて説明する。本実施例では、防腐剤を含まない蓄熱材サンプルと、防腐剤Nを含む蓄熱材サンプルとを作製した。また、いずれの蓄熱材サンプルにも水道水(千葉県柏市水道局)に塩化カリウム及び炭酸水素カリウムを溶解させた混合水溶液を用いた。塩化カリウムの濃度は20wt%とし、炭酸水素カリウムの濃度は5.0wt%とした。本実施例の蓄熱材サンプルの融点は、約-12℃である。また、防腐剤Nの濃度は、0.1wt%とした。
次に、本実施の形態の実施例6による蓄熱材について図10及び図11を用いて説明する。本実施例では、防腐剤を含まない蓄熱材サンプルと、防腐剤Nを含む蓄熱材サンプルとを作製した。また、いずれの蓄熱材サンプルにも超純水に塩化アンモニウムを溶解させた無機塩水溶液を用いた。塩化アンモニウムの濃度は20wt%とした。本実施例の蓄熱材サンプルの融点は、約-16℃である。また、防腐剤Nの濃度は、0.1wt%とした。
次に、本実施の形態の実施例7による蓄熱材について図12を用いて説明する。本実施例では、蓄熱材を冷凍冷蔵庫に搭載し、保冷効果の評価を行った。本実施例による蓄熱材は、蓄熱材主剤である塩化カリウム水溶液と、塩化カリウム水溶液に溶解された防腐剤Nを有している。本実施例による蓄熱材を、縦24cm、横25cm、高さ1.5cmの直方体形状を備えたブロー容器に600g充填し、冷凍冷蔵庫(シャープKireiSJ-225MF)の冷凍庫内中央の棚上に配置した。蓄熱材を冷凍庫内で18時間冷却して凍結させた後、冷凍冷蔵庫の電源をオフにして、蓄熱材及び冷凍庫内の温度変化を測定した。また、本実施例では、蓄熱材入りのブロー容器表面の温度を熱電対で測定し、蓄熱材の温度変化を測定した。また、本実施例では、比較のために蓄熱材を搭載しなかった場合の電源オフ後の冷凍庫内の温度を測定した。
上記実施の形態による蓄熱材は、過冷却防止剤を有していてもよい。過冷却防止剤としては、四ホウ酸ナトリウム(無水物、五水和物、十水和物)又はリン酸水素二ナトリウムを用いることができる。
Claims (8)
- 無機塩水溶液と、
前記無機塩水溶液に溶解され、防腐機能を備えるとともに前記無機塩水溶液の融点での相転移時間を増加させる防腐剤とを有すること
を特徴とする蓄熱材。 - 請求項1記載の蓄熱材であって、
前記防腐剤は、メチルクロロイソチアゾリノン、メチルイソチアゾリノン又は塩素酸ナトリウムの少なくもいずれか一つを含むこと
を特徴とする蓄熱材。 - 請求項1又は2に記載の蓄熱材であって、
前記防腐剤の濃度は、0.05wt%以上、0.1wt%以下であること
を特徴とする蓄熱材。 - 請求項1から3までのいずれか1項に記載の蓄熱材であって、
前記無機塩水溶液は、塩化カリウム水溶液であること
を特徴とする蓄熱材。 - 請求項1から3までのいずれか1項に記載の蓄熱材であって、
前記無機塩水溶液は、塩化カリウム及び炭酸水素カリウムの混合水溶液であること
を特徴とする蓄熱材。 - 請求項1から3までのいずれか1項に記載の蓄熱材であって、
前記無機塩水溶液は、塩化アンモニウム水溶液であること
を特徴とする蓄熱材。 - 請求項1から6までのいずれか1項に記載の蓄熱材を搭載していること
を特徴とする冷凍冷蔵庫。 - 請求項1から6までのいずれか1項に記載の蓄熱材を搭載していること
を特徴とする保冷容器。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016514891A JP6284627B2 (ja) | 2014-04-24 | 2015-04-16 | 蓄熱材 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014090524 | 2014-04-24 | ||
JP2014-090524 | 2014-04-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015163236A1 true WO2015163236A1 (ja) | 2015-10-29 |
Family
ID=54332402
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2015/061735 WO2015163236A1 (ja) | 2014-04-24 | 2015-04-16 | 蓄熱材 |
Country Status (2)
Country | Link |
---|---|
JP (1) | JP6284627B2 (ja) |
WO (1) | WO2015163236A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106518125A (zh) * | 2016-12-08 | 2017-03-22 | 赵岩 | 耐火材料包覆的复合相变蓄热砖 |
JP2018016691A (ja) * | 2016-07-26 | 2018-02-01 | Jsr株式会社 | 組成物、成形体及び建築材料 |
JP2018016690A (ja) * | 2016-07-26 | 2018-02-01 | Jsr株式会社 | 組成物、成形体及び建築材料 |
WO2019013636A1 (en) * | 2017-07-14 | 2019-01-17 | Botemp B.V. | THERMAL BATTERY |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11560503B2 (en) * | 2020-04-15 | 2023-01-24 | Ut-Battelle, Llc | Stable salt hydrate-based thermal energy storage materials |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995008601A1 (en) * | 1993-09-21 | 1995-03-30 | Battelle Memorial Institute | Microwave-activated thermal storage material |
JP2002129151A (ja) * | 2000-10-26 | 2002-05-09 | Rokuro Suzuki | 蓄冷剤 |
JP2003155473A (ja) * | 2001-11-21 | 2003-05-30 | Koji Mizutani | 蓄冷剤、蓄冷パック及び保冷ボックス |
JP2007217460A (ja) * | 2006-02-14 | 2007-08-30 | Saitoo Seisakusho:Kk | 保冷剤及び保冷剤パックとその保冷剤パックを備えて包装した保冷包装食品 |
-
2015
- 2015-04-16 WO PCT/JP2015/061735 patent/WO2015163236A1/ja active Application Filing
- 2015-04-16 JP JP2016514891A patent/JP6284627B2/ja active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995008601A1 (en) * | 1993-09-21 | 1995-03-30 | Battelle Memorial Institute | Microwave-activated thermal storage material |
JP2002129151A (ja) * | 2000-10-26 | 2002-05-09 | Rokuro Suzuki | 蓄冷剤 |
JP2003155473A (ja) * | 2001-11-21 | 2003-05-30 | Koji Mizutani | 蓄冷剤、蓄冷パック及び保冷ボックス |
JP2007217460A (ja) * | 2006-02-14 | 2007-08-30 | Saitoo Seisakusho:Kk | 保冷剤及び保冷剤パックとその保冷剤パックを備えて包装した保冷包装食品 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2018016691A (ja) * | 2016-07-26 | 2018-02-01 | Jsr株式会社 | 組成物、成形体及び建築材料 |
JP2018016690A (ja) * | 2016-07-26 | 2018-02-01 | Jsr株式会社 | 組成物、成形体及び建築材料 |
CN106518125A (zh) * | 2016-12-08 | 2017-03-22 | 赵岩 | 耐火材料包覆的复合相变蓄热砖 |
WO2019013636A1 (en) * | 2017-07-14 | 2019-01-17 | Botemp B.V. | THERMAL BATTERY |
NL2019249B1 (nl) * | 2017-07-14 | 2019-01-28 | Botemp B V | Thermische accu |
Also Published As
Publication number | Publication date |
---|---|
JPWO2015163236A1 (ja) | 2017-04-13 |
JP6284627B2 (ja) | 2018-02-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6284627B2 (ja) | 蓄熱材 | |
US10717910B2 (en) | Cold storage material composition, cold storage material, and transport container | |
Johansen et al. | Thermal conductivity enhancement of sodium acetate trihydrate by adding graphite powder and the effect on stability of supercooling | |
JP6226488B2 (ja) | 蓄熱材、及びそれを用いた蓄熱部材、保管容器、輸送・保管容器、建材、建築物 | |
JP6222673B2 (ja) | 蓄熱材及びそれを備えた冷蔵庫 | |
EP1921124A1 (en) | Heat storable substance, heat storage agent, heat storage material, heat transfer medium, low temperature insulation agent, low temperature insulation material, melting point controlling agent for heat storage agent, agent for prevention of overcooling for use in heat storage agent, and process for | |
JP6293143B2 (ja) | 蓄熱部材およびそれを用いた保管容器、およびそれを用いた冷蔵庫 | |
JP6594870B2 (ja) | 保冷部材 | |
JP6598076B2 (ja) | 潜熱蓄冷材 | |
JP6723266B2 (ja) | 蓄熱材、これを用いた冷蔵庫および保冷容器 | |
US20190048242A1 (en) | Thermal storage medium, and thermal storage pack, thermostatic vessel, and transport box using the medium | |
JP4840075B2 (ja) | 保冷剤および保冷材 | |
JPH09255943A (ja) | 蓄冷剤 | |
WO2019013636A1 (en) | THERMAL BATTERY | |
JPWO2019013161A1 (ja) | 蓄熱材、保冷容器および冷蔵庫 | |
US6146546A (en) | Freezable coolant composition | |
JP2000154379A (ja) | 冷凍剤、恒温冷却装置及び急速冷却装置 | |
WO2023085383A1 (ja) | 蓄冷材組成物およびその利用 | |
US20180155596A1 (en) | Methods and compositions for lowering ice temperature and freezing point of water | |
GB2600510A (en) | Phase change material | |
CN101993683A (zh) | 电冰箱电冰柜功能外延伸使用的蓄冷剂 | |
JP2017133811A (ja) | 保冷庫 | |
JP2002122376A (ja) | 家庭用蓄冷システム | |
KR20130037809A (ko) | 얼음과 소금의 흡열반응 냉장고 | |
TH98387A (th) | สารรักษาอุณหภูมิสำหรับผลิตภัณฑ์แช่แข็ง |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 15783855 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2016514891 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: IDP00201607968 Country of ref document: ID |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 15783855 Country of ref document: EP Kind code of ref document: A1 |