Heat storage unit

Patent metadata

Field	Value
Publication number	US-10976114-B2
Application number	US-201716632381-A
Country	US
Kind code	B2
Filing date	Aug 2, 2017
Priority date	Jul 26, 2017
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

A heat storage unit, at least comprises one single-layer closed case (2) that has at least one heat exchange surface (8, 9) and a non-heat exchange surface; the internal space of the closed housing (2) is filled with a foam skeleton (4); the phase change medium (6) is homogeneous distributed in the voids of the foam skeleton (4), and forms a composite material (02) together with the foam skeleton (4), the composite material has a higher thermal conductivity coefficient than that of the pure phase transition medium (6); vibration particles (3) are made of shape memory alloy, pressed into strips and then filled into the voids of the foam copper frame (4) by filtration; the ultrasonic generator (05) emits ultrasonic to induce the vibration particles (3) to generate vibration, the vibration converts the liquid phase transition medium (6) from natural convection or pure heat conduction to forced convection.

First claim

The invention claimed is:

1. A heat storage unit includes at least a single-layer closed case, wherein
the closed case ( 2 ) has at least one heat exchange surface ( 8 , 9 ) and one non-heat exchange surface;
a foam skeleton ( 4 ) is filled in the internal space of the closed housing ( 2 );
the phase change medium ( 6 ) is homogeneous distributed in the voids of the foam skeleton ( 4 ), and forms a composite material ( 02 ) together with the foam skeleton ( 4 ), the composite material has a higher thermal conductivity coefficient than that of the pure phase change medium ( 6 );
vibration particles ( 3 ) are made of shape memory alloy, pressed into strips and then filled into the voids of the foam skeleton ( 4 ) by filtration;
the ultrasonic generator ( 05 ) emits ultrasonic to induce the vibration particles ( 3 ) to generate vibration, the vibration converts the liquid phase change medium ( 6 ) from natural convection or pure heat conduction to forced convection;
the ultrasonic generator ( 05 ) improves the convective heat transfer coefficient of the liquid phase change medium ( 6 ) by using the cavitation and acoustic flow effects of ultrasonic.

2. The heat storage unit according to claim 1 , wherein the heat exchange surface ( 8 , 9 ) and the non-heat exchange surface of the single-layer closed case ( 2 ) are made of the same metal or non-metal material, and the non-heat exchange surface is wrapped by heat insulation material.

3. The heat storage unit according to claim 1 , wherein the heat exchange surface ( 8 , 9 ) and the non-heat exchange surface of the single-layer closed case ( 2 ) are made of different materials, the thermal conductivity of the surface ( 8 , 9 ) material is higher than that of the non-heat exchange surface material.

4. The heat storage unit according to claim 1 , wherein the foam skeleton ( 4 ) is made of a metal or non-metal material.

5. The heat storage unit according to claim 1 , wherein the foam skeleton ( 4 ) is a network structure.

6. The heat storage unit according to claim 1 , wherein that the phase change medium is made of a material that undergoes phase change at a certain temperature and at least one phase is a liquid phase, and absorbs or releases latent heat during the phase change.

7. The heat storage unit according to claim 6 , wherein the phase change medium ( 6 ) includes paraffin, molten salt, liquid metal, or an easily gasified organic material.

8. The heat storage unit according to claim 1 , wherein the cold shape of the vibration particles ( 3 ) is branch-shaped, ring-shaped, arc-shaped, or cross-shaped, the vibration particles ( 3 ) are pressed into strips at room temperature, and added into the foam skeleton ( 4 ) by filtration, when the strip vibration particles ( 3 ) are heated and then cooled down, due to high temperature deformation, the strip vibration particles ( 3 ) restore the cold shape, and get stuck in the foam skeleton ( 4 ), so that the vibration particles ( 3 ) is stable and prevented from falling out of the foam skeleton ( 4 ).

9. The heat storage unit according to claim 1 , wherein the vibration of the vibration particles ( 3 ) is provided by an external ultrasonic, an alternating electromagnetic field or a motor instead of the ultrasonic generation device ( 05 ), the vibration of the vibration particles ( 3 ) is provided by the vibration particles ( 3 ) themselves.

10. The heat storage unit according to claim 1 , wherein the ultrasonic generation device ( 05 ) is an ultrasonic generator that consumes electrical energy or a self-powered thermoacoustic conversion device.

11. The heat storage unit according to claim 1 , wherein the heat exchange surface ( 8 , 9 ) includes fins or is surface treated.

12. A heat exchanger, comprising a heat storage unit, the heat storage unit at least includes a single-layer closed housing, wherein
the closed housing ( 2 ) having at least one heat exchange surface ( 8 , 9 ) and a non-heat exchange surface;
a foam skeleton ( 4 ) is filled in the internal space of the closed housing ( 2 );
the phase transition medium ( 6 ) is evenly distributed in the voids of the foam skeleton ( 4 ), and forms a composite material ( 02 ) together with the foam skeleton ( 4 ), the composite material has a higher thermal conductivity coefficient than that of the pure phase transition medium ( 6 );
vibration particles ( 3 ) are made of shape memory alloy, pressed into strips and then filled into the voids of the foam skeleton ( 4 ) by filtration;
the ultrasonic generator ( 05 ) emits ultrasonic to induce the vibration particles ( 3 ) to generate vibration, the vibration converts the liquid phase transition medium ( 6 ) from natural convection or pure heat conduction to forced convection;
the ultrasonic generator ( 05 ) improve the convective surface heat transfer coefficient of the liquid phase transition medium ( 6 ) by using the cavitation and acoustic flow effects of ultrasonic.

Assignees

• Univ Xi An Jiaotong

Inventors

• Wang Qiuwang
• Pu Yuchen
• Wang Zuowei
• Zhu Ziliang
• Zhang Zhuo
• Zhu Lei
• Zhang Mengwei
• Ma Ting
• Li Xinyi

Classifications

• F28F13/003 Primary

  by using permeable mass, perforated or porous materials (F28F13/18 takes precedence) · CPC title

• F28D20/023

  the latent heat storage material being enclosed in granular particles or dispersed in a porous, fibrous or cellular structure · CPC title

• F28F2250/08

  Fluid driving means, e.g. pumps, fans · CPC title

• H01S3/0407

  Liquid cooling, e.g. by water · CPC title

• F28F2270/00

  Thermal insulation; Thermal decoupling · CPC title