Phase change thermal storage device and staggered-fin pipe structure thereof

Abstract

A phase change heat storage device includes a housing having two opposing sides and an accommodating space; at least one pipeline structure with staggered heat-conducting fins disposed in the accommodating space, the pipeline structure including a pipeline extending along an axial direction and having opposing inlet ends and outlet ends; at least two fin assemblies disposed adjacent to the aforementioned pipeline, the aforementioned fin assemblies having a plurality of first fins and a plurality of second fins, the aforementioned first fins and the aforementioned second fins being staggered around the pipeline with the aforementioned axial direction as the center, and adjacent aforementioned first fins and the aforementioned second fins being formed at a first angle with the aforementioned axial direction as the center. The aforementioned first fin has a first height along a radial direction of the pipeline, and the aforementioned second fin has a second height along the radial direction. The ratio of the first height to the second height is between 4 and 12. The inlet end and the outlet end extend out of the two sides respectively. A heat storage material fills the accommodating space and covers the aforementioned pipeline structure with staggered heat-conducting fins. In this way, the higher first fin can increase the heat exchange area, while the lower second fin can reserve space in the nearby area, which helps to promote the formation of eddies, thereby enhancing the flow of liquefied heat storage material and allowing energy to be naturally convectioned.

Claims

1. A pipe structure with staggered heat-conducting fins, comprising: a pipe extending along an axial direction and having an opposing inlet end and an outlet end; at least two fin assemblies disposed adjacently in the pipe, the fin assemblies having a plurality of first fins and a plurality of second fins, the first fins and the second fins being staggered around the pipe about the axial direction, adjacent first fins and second fins being separated by a first angle about the axial direction, the first fins having a first height along a radial direction of the pipe, the second fins having a second height along the radial direction, the ratio of the first height to the second height being between 4 and 12.

2. The piping structure with staggered heat-conducting fins as described in claim 1, wherein, The first fin of one of the aforementioned fin assemblies is connected to the second fin of the other of the aforementioned fin assemblies.

3. The piping structure with staggered heat-conducting fins as described in claim 1, wherein, The aforementioned first fin extends in a rectangular shape along the axial direction, and the aforementioned second fin extends in a rectangular shape along the axial direction.

4. The piping structure with staggered heat-conducting fins as described in claim 3, wherein, The aforementioned first fin and the aforementioned second fin extend to the same length in this axial direction.

5. The piping structure with staggered heat-conducting fins as described in claim 1, wherein, The aforementioned first fin and the aforementioned second fin have a thickness between 0.5 mm and 2 mm.

6. The piping structure with staggered heat-conducting fins as described in claim 1, wherein, The aforementioned pipeline is a hollow tube with an inner wall and an outer wall, and the aforementioned first fin and the aforementioned second fin extend radially from the outer wall.

7. The piping structure with staggered heat-conducting fins as described in claim 1, wherein, There are two short fin assemblies, two of the aforementioned short fin assemblies are disposed in the pipeline, and the aforementioned fin assembly is located between the two aforementioned short fin assemblies, and the aforementioned short fin assembly is connected to the adjacent aforementioned fin assembly. The ratio of the length of the aforementioned short fin assembly to the length of the aforementioned fin assembly along the axial direction is between 0.5 and 0.

9. The aforementioned short fin assembly has a plurality of first short fins and a plurality of second short fins. The aforementioned first short fins and the aforementioned second short fins are staggered around the pipeline with the axial direction as the center. The adjacent aforementioned first short fins and the aforementioned second short fins are sandwiched at a first angle with the axial direction as the center. The aforementioned first short fins have the first height along the radial direction of the pipeline, and the aforementioned second short fins have the second height along the radial direction.

8. The piping structure with staggered heat-conducting fins as described in claim 7, wherein, Along this axis, the aforementioned first short fin is connected to the adjacent aforementioned second fin, and the aforementioned second short fin is connected to the adjacent aforementioned first fin.

9. The piping structure with staggered heat-conducting fins as described in claim 7, wherein, The aforementioned first short fin extends in a rectangular shape along this axis, and the aforementioned second short fin extends in a rectangular shape along this axis.

10. The piping structure with staggered heat-conducting fins as described in claim 9, wherein, The aforementioned first short fin and the aforementioned second short fin have the same length extending along this axis.

11. The piping structure with staggered heat-conducting fins as described in claim 7, wherein, The aforementioned first short fin and the aforementioned second short fin have a thickness between 0.5 mm and 2 mm.

12. A phase change heat storage device comprising a pipeline structure with staggered heat-conducting fins as claimed in any one of claims 1 to 11, comprising: a housing having two opposing sides and a receiving space; at least one of the aforementioned pipeline structures with staggered heat-conducting fins disposed in the receiving space, with the inlet end and the outlet end extending out of the two sides respectively; and a heat storage material filling the receiving space and covering the aforementioned pipeline structure with staggered heat-conducting fins.

13. The phase change thermal storage device as described in claim 12, wherein, The housing extends along a Z-direction with a height and a Y-direction with a width. The Z-direction and the Y-direction are perpendicular to each other and form a YZ plane. An X-direction is perpendicular to the YZ plane, and the axial direction is parallel to the X-direction. Eight of the aforementioned pipe structures with staggered heat-conducting fins are provided inside the housing. In the Z-direction, the eight aforementioned pipe structures with staggered heat-conducting fins are divided into two rows, with four of the aforementioned pipe structures with staggered heat-conducting fins in each row. They are aligned in the Y-direction, and the spacing between two adjacent pipes in the Y-direction and the Z-direction is greater than twice the first height of the aforementioned first fin.

14. The phase change thermal storage device as described in claim 12, wherein, The material used for heat storage is water.

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