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Heat storage device and method of using latent heat storage material

a technology of latent heat and storage material, which is applied in the direction of indirect heat exchangers, heat storage plants, lighting and heating apparatus, etc., can solve the problem of unstable supercooled sta

Inactive Publication Date: 2015-08-27
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about a technique for maintaining a stable state of a material that can store heat for a long time. This technique helps to keep the material in a state that allows for efficient heat storage and retrieval.

Problems solved by technology

However, typically, supercooled state is unstable.

Method used

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  • Heat storage device and method of using latent heat storage material
  • Heat storage device and method of using latent heat storage material
  • Heat storage device and method of using latent heat storage material

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

Configuration

[0038]As illustrated in FIG. 1, a heat storage device 12 according to Embodiment 1 includes a plurality of heat storage units 11 and a chassis 121 in which the plurality of heat storage units 11 are contained. The plurality of heat storage units 11 are, for example, stacked at constant intervals in the chassis 121. The chassis 121 includes a heating medium inlet 122 through which a heating medium flows in and a heating medium outlet 123 through which the heating medium flows out. Heat is exchanged between the heating medium and the plurality of heat storage units 11. In the heat storage device 12, the heat exchange can be easily performed. Examples of the heating medium include water, brine, and oil.

[0039]As illustrated in FIG. 2, each of the plurality of heat storage units 11 includes a container 112 and a latent heat storage material 111 that fills the container 112. The container 112 may have a high heat conductive property. This can improve the heat conductivity of ...

experiment 1

[0066]Experiment 1 using a test unit having a similar configuration to the heat storage unit 11 of Embodiment 1 is described below.

[0067]FIG. 7 illustrates a configuration of a test unit 71 used in Experiment 1. A container 712 was an acrylic container having an inner volume of 4 mL. A latent heat storage material 711 was a sodium acetate solution having a concentration of 55% by weight. A pair of counter electrodes 713 were stainless-steel counter electrodes disposed at an interval of 2 mm. The latent heat storage material 711 filled the container 712 and was in contact with the pair of counter electrodes 713. A thermocouple 716 for detecting the temperature of the latent heat storage material 711 was inserted from a side surface of the container 712 and was in contact with the latent heat storage material 711. Twenty test units 71 having this configuration were prepared, and an alternating-current power source was connected to the counter electrodes 713 of ten test units 71 out of...

embodiment 2

[0072]In Embodiment 2, an example of a method for determining the magnitude of an alternating-current voltage applied to counter electrodes 113 is described. Configurations of heat storage units 11, a heat storage device 12, and an air heating device 13 are identical to those described in Embodiment 1. A method for driving the heat storage device 12 and the air heating device 13 is identical to that described in Embodiment 1 except for the magnitude (peak value) of the alternating-current voltage.

[Magnitude of Alternating-Current Voltage]

[0073]In a case where an external electric field E is being applied to a latent heat storage material 111, a free energy difference ΔG (r) may be expressed by the following expression (4):

ΔG(r)=GσΔS-GLΔTΔV+GEE2ΔVGL=ΔHρTe,GE=3ɛL(1-ɛS / ɛL)8π(2+ɛS / ɛL)(4)

[0074]where ΔS is surface area of a solid-phase particle, ΔV is a volume of the solid-phase particle, ΔT is the degree of supercooling, E is an external electric field, Gσ is a surface energy coefficient...

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Abstract

A heat storage device includes a pair of electrodes; an alternating-current power source that applies an alternating-current voltage to the pair of electrodes; and a latent heat storage material that is disposed between the pair of electrodes, a supercooled state of the latent heat storage material being maintained by the alternating-current voltage.

Description

BACKGROUND[0001]1. Technical Field[0002]The present disclosure relates to a heat storage device and a method of using a latent heat storage material.[0003]2. Description of the Related Art[0004]Conventionally, as a heat storage medium, a latent heat storage material that absorbs or releases latent heat during phase transition between a solid phase and a liquid phase has been considered. One example of a latent heat storage material is sodium acetate trihydrate. Latent heat storage materials have a property of maintaining a liquid phase without undergoing a phase transition even below a freezing point, so-called supercooling.[0005]Japanese Unexamined Patent Application Publication No. 2012-32130 discloses a supercooling control device that maintains supercooling by applying a direct-current negative voltage to a copper electrode whose tip has a plurality of V-shaped grooves, and that releases supercooling by applying an alternating-current voltage to the copper electrode.SUMMARY[0006...

Claims

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Application Information

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IPC IPC(8): F28D20/02
CPCF28D20/02F28D20/028Y02E60/14
Inventor MAEDA, SHIGENORIGUSHIMA, TOYOJITANAKA, TOSHIYASUTOMITA, HIRONORIHONDA, RENJI
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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