JPS591995A - Heat accumulator - Google Patents

Abstract

PURPOSE:To increase heat exchanging efficiency by the reduction of heat transmitting resistance, increase of heat transmitting area or the like by a method wherein the assembled body of bar-like configuration stabilizing high-density polyethylene members is utilized in the heat accumulating body. CONSTITUTION:Horizontal partitioning plates 15 are arranged alterately in a vessel 12 to form meandering paths and vertical partitioning plates 16 are provided at both ends thereof while heat accumulating bodies are accommodated in the spaces partitioned by each partitioning plates 15, 16. Upon accumulating the heat, heat medium is inflowed through the upper outflow and inflow port 14 while it is inflowed through the lower inflow and outflow port 13 reversely upon radiating the heat. In the whole arrangement of the heat accumulating bodies 10, they may be laminated into transversal or up-and-down direction in one partitioning. The heat accumulating body 10 is constituted by branching a plurality of bar-like bodies of the configuration stabilizing high-density polyethylene 1 by employing holding members 2 while the heat accumulator, constituted by the vessel and the heat accumulating body 10 accommodated and fixed in the vessel, increases the technical reliability thereof and promotes the effective utilization of heat energy further.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat storage device using rod-shaped high-density polyethylene with a stabilized shape.

Thermal energy storage has become an important issue from the viewpoint of energy conservation. By the way, among various heat storage methods, those using latent heat storage have a high (S) heat storage density and are characterized by the ability to extract thermal energy at a constant temperature, or use some kind of fluid as a heat medium [heat exchange with a heat storage material]. Therefore, the quality of heat exchange has a great influence on the performance of the heat storage device (see "Japanese Science and Technology Jl-2, 1982)".

High-density polyethylene has a large latent heat of fusion and good thermal stability, making it an excellent latent heat storage material.
By methods such as plasma treatment, radiation irradiation, coating with foreign substances, and treatment with peroxide, it can be modified into a shape-stabilized product that does not become fluidized or cause mutual fusion even when melted (Japanese Patent Application No. 1983) -15845). It is also possible to coat the surface of ordinary high-density polyethylene with the high-density polyethylene that has been stabilized in this way. By using shape-stable high-density polyethylene, or high-density polyethylene whose shape is stabilized only on the surface, it is possible to bring the heat medium into direct contact with the heat storage material, reducing heat transfer resistance and increasing heat transfer area. This dramatically improves heat exchange and significantly improves the performance of the heat storage device. As will be described later, the present invention uses high-density polyethylene as a shape-stable high-density polyethylene as described above for a heat storage body.

On the other hand, in conventional latent heat storage devices, the container is filled with heat storage material and heat is exchanged with the heat medium through the container wall.
Heat exchange performance is poor and improvements in heat exchange require significant cost increases.

Proposals have already been made for heat storage devices using the above-mentioned shape-stable high-density polyethylene in various shapes (Japanese Unexamined Patent Publication No. 53
-149877), experiments on heat storage using pelleted polyethylene have also been attempted (0RNL
/5ub-7641/], especially by using a rod-shaped one, it is easy to analyze the heat storage device, the filling rate (i.e. heat storage density) can be easily changed, and the heat medium can be flowed in the longitudinal direction. This reduces pressure loss,
Further, it is considered that there are advantages such as a uniform flow of fluid can be obtained. However, even if shape stabilization is applied, there will be no fluidization or mutual fusion during melting, but the material will soften and the volume will change significantly when melted. The biggest problem in putting heat storage into practical use is whether to fill it or not.

This invention was made in order to solve the above-mentioned problems, and involves forming an aggregate using rod-shaped shape-stable high-density polyethylene, and exchanging heat by flowing a heat medium in the longitudinal direction of the aggregate. The present invention provides a heat storage device according to the present invention. Embodiments of the present invention will be described below with reference to the drawings.

[Embodiment 1] FIGS. 1(a) and 1(b) are a perspective view of a main part and a plan view thereof showing an embodiment of a heat storage body used in a heat storage device of the present invention. In this embodiment, a rod 1 made of shape-stable high-density polyene is partially or completely inserted and held in each #-shaped partition 3 made of a holding material 2 to form a heat storage body 10. be.

Figures 2(a) and (b) are similar to Figures 1(a) and (b).
This is a modification of the embodiment in which the holding member 2 is formed into a square shape, and the rods 1 are inserted and held in each partition portion 3.

The height of the holding material 2 in FIGS. 1 and 2 is, for example, 5 to 2000.
m is used. The shape of the holding material 2 may be arbitrary as long as the rod 1 can be maintained in a bundle-like form.

In addition, since the shape-stable high-density polyethylene in the molten state is softened, the rods 1 in each partition part 3 of the holding material 2 are inserted into the rods 1 for reinforcement as shown in FIGS. 3(a) and 3(b). Diameter 1~2
The heat storage body 10 is held by inserting one or more rigid reinforcing members 4 in the longitudinal direction, such as hollow metal rods of approximately 0.0 mm, solid metal rods, or any shape of rigid reinforcing material 4 having approximately the same cross-sectional area. I was able to make row 5 even more effective.

Furthermore, for the same purpose, as shown in Figure 4, it was also effective to use shape-stable high-density polyethylene using a metal wire or a wire rod with equivalent rigidity as the core material 5. . In FIG. 4, the metal wire core 5 is shown in the longitudinal direction.
Reinforced shape-stable high-density polyethylene rod 1'
This is an example of holding a plurality of rods in a bundle, but if all the rods 1' are made of reinforced shape-stable high-density polyethylene,
The holding material 2 is unnecessary.

[Example 2] As shown in Fig. 5, a rod 1 made of shape-stable high-density polyethylene is fastened and held like a blind with a thread 6 made of a thin material as a holding material 2, and the rod is wrapped around to store heat. An aggregate is made and used as a heat storage body 10. In this case, it may be fastened in one layer as shown in FIG. 5, or it may be fastened in multiple layers.

Although it may be practical to fasten only one end in the longitudinal direction, more effective retention has become possible by fastening at both ends or at several locations as shown in FIG. Then, a part or the whole of the rod 1 is removed from the embodiment 1.
The reinforced shape-stable high-density polyethylene rod 1' described in
If this is done, the retention effect will be further improved.

[Example 3] When filling a container with the heat storage body 10 shown in Example 1 or 2 described above, movement of the heat storage body 10 within the container can be completely prevented by simply providing a partition plate inside the container. Although it may be possible to do so in some cases, by employing the fixing means described below, more stable filling becomes possible.

One end or both ends of a part or all of the heat storage body 10 are fixed to the fixing material 11 in the container as shown in FIG.
Fixed to. In this case, it is necessary to take care not to block the fluid flow path at the fixing point. In Figure 6, both ends are fixed, or multiple heat storage bodies 10 are stacked and both upper and lower ends are fixed. It's okay.

As a fixing means, metal is attached to the surface of the rod 1,
This is adhered to the fixing material 11 using an adhesive or attached to the fixing material 11 having magnetism.

The fixing material 11 may have any shape, such as net-like or porous, as long as a flow path is secured even when the heat storage body 10 is fixed.

In the case of the above-mentioned fixing means, metal adhesion was particularly easy to use, but materials other than metal may be used as long as they can be used for the above purpose. Moreover, the attachment is not limited to the surface, and other materials that can be used for the above purpose may be connected to the end of the rod 1.

As another fixing means, it is also effective to provide a hole in the fixing member 11 so that the rod 1 cannot come out and insert the end of the rod 1 into this hole. Alternatively, a hole may be made at the end of the rod 1 and a thin thread-like material may be passed through the hole and fixed. Furthermore, if the reinforced shape-stable high-density polyethylene rod 1' described in Examples 1 and 2 above is used, the reinforcing material 4
Fixation becomes extremely easy by using.

FIG. 7 shows a heat storage body 10 consisting of an assembly of rods 1 having both types of support rods T at their ends, which is fixed to a net-like fixing member 11'.

If the heat storage body 10 is fixed to the fixing material 11 in the container using the above fixing means, the rod 1 will not be deformed even under the flow of the heat medium and can be reliably supported in the container.

[Example 4] The heat storage body 10 fixed by the means of Examples 1 to 30 described above was filled into a container so that the rod 1 was oriented vertically, and
A heat medium is caused to flow in the vertical direction, that is, in the longitudinal direction of the rod 1 to exchange heat. The heat storage body 10 is made by arranging the rods 1 horizontally in one or more rows or stacking them vertically in one or more stages to form a container.
can be filled inside. In order to prevent natural convection within the container, the flow direction of the heat medium is such that during heat storage, the heat medium flows in from above and flows out from below. Conversely, during heat dissipation, the heat medium is caused to flow in from below and flow out from above.

FIG. 8 is a longitudinal sectional view showing an embodiment of the heat storage device according to the present invention. In this example, a shape-stable high-density polyethylene rod 1 with a diameter of 2.6 ytrx and a length of 40
The cells were bundled in a cylinder with a diameter of 16fi at a body fat fraction of 60%, and the upper and lower parts were each 5cIn wide.
The heat storage body 10 held by the holding material 2 made of 4 inch (x9.o5) 77 Reminicum honeycombs 7 is stacked in two layers, and both ends of the stack are connected to the net-like fixing material 1 inside the container 12.
1 is supported. Note that 13 and 14 are inlet and outlet ports for the heat medium.

FIG. 9 shows that after initially maintaining the inside of the container 12 at 140°C using high-temperature ethylene glycol as a heat medium, the temperature was increased to 103°C.
of ethylene glycol from the bottom at 0.5 l/min.
The figure shows the temperature of the heat medium at the entrance and exit of the container 12 when it flows in at a flow rate of . In this figure, the curved line is the inlet temperature of the heat medium, and the curved line is the outlet temperature, the horizontal axis is time, and the vertical axis is temperature.

The fact that a clear constant temperature output is obtained at the solidification temperature of polyethylene (approximately 127° C.) in this way proves that sufficient heat exchange is taking place.

[Embodiment 5] FIGS. 10(8) and 10(b) are a side sectional view and a sectional view taken along the line A-A, showing another embodiment of the heat storage device according to the present invention.

In this embodiment, a horizontal partition plate 15 is provided inside the container 12.
are arranged alternately to form a meandering passage, vertical partition plates 18 are installed at both ends, and the above-mentioned heat storage body 10 is accommodated in the space partitioned by each partition plate 15 and 16. The partition plate 16 also serves as the fixing member 110 shown in FIG. 8, and is of a net shape. Then, the heat medium flows from the inlet 13 toward the inlet 14 (or vice versa) while meandering in the direction of an arrow. That is, similar to the embodiment shown in FIG. 8, the heat medium is allowed to flow in from the upper outlet port 14 during heat storage, and conversely flows from the lower outlet port 13 during heat radiation. Further, the overall arrangement of the heat storage bodies 10 may be such that they are stacked horizontally or vertically within one partition. Also, unlike Example 4.

The rod 1.1' is retained due to the presence of the partition plate 15.16.

There may be cases where fixation is not necessary.

In addition, the heat storage device of this invention (dimensional information of the shape-stable high-density polyethylene rod 1 used, diameter 1 to 20111, length 1
A round bar of 0 to 2000 u is preferable, and any solid or hollow shape with a similar cross-sectional area may be used.

The upper limit of the volumetric filling rate of polyethylene is about 75%, which is the closest packing, but since the thermal expansion of polyethylene is large and the flow resistance of the heating medium increases, it is preferably about 60% at room temperature. Fill to a filling rate of 5.

Furthermore, there are no restrictions on the use of the heat medium as long as it is a fluid that has good coexistence with polyethylene, but it is preferably a fluid with low viscosity and high specific heat, such as the above-mentioned ethylene glycol.

As explained in detail above, this invention consists of a heat storage body by bundling a plurality of shape-stable high-density polyethylene fibers using a holding material, and storing and fixing this in a container to construct a heat storage body. Therefore, compared to conventional latent heat storage devices, its engineering reliability can be significantly improved, and the effective use of thermal energy can be promoted even more strongly. In addition, since the Shintai is bundled with thin metal wires or threads, the structure is extremely simple.Furthermore, since both ends of the heat storage body are fixed with a net-like fixing material, the flow of the heat medium is hardly hindered and it is fixed. It has advantages such as:

[Brief explanation of the drawing]

1(a) and 1(b) are a perspective view and a plan view of the main parts showing one embodiment of the heat storage body used in the present invention, and FIG. 2(a)
), (b) is a perspective view of the main part and its plan view, similarly showing another embodiment, and FIG. 4(a) and 4(b) are a front view and a plan view showing another example of the structure of the rod, and FIG. 5 is a perspective view showing another embodiment of the heat storage body of the present invention. , FIG. 6 is a side view showing one embodiment of the heat storage body fixing means of the present invention, FIG. 7 is a perspective view showing another embodiment of the heat storage body fixing means, and FIG. 8 is a heat storage body according to the present invention. Fig. 9 is a longitudinal cross-sectional view showing one embodiment of the vessel; Fig. 9 is a diagram showing changes in the inlet temperature and outlet temperature of the heat medium over time in the embodiment of Fig. 8; Fig. 1θ (a);
b) is a side sectional view and a sectional view taken along the line A-A, similarly showing another embodiment. In the figure, 1.1' is the divine body, 2 is the holding material, 3 is the partition, 4 is the reinforcing material, 5 is the core material, 6 is the thread, T is the support rod, 10 is the heat storage body, IL11' is the fixing material, 12 is a container, 13° and 14 are inlet and outlet ports, and 15 and 16 are partition plates. Figure 7 Figure 8 Figure 9 jl, + (a) Town time (minutes), l, knee (...1.1.cao Figure 10 (a)

Claims (1)

[Claims] (]) A heat storage body is constructed by bundling a plurality of rods made of shape-stable high-density polyethylene with a holding material, and this heat storage body is housed and fixed in a container, and the heat storage body is constructed. A heat storage device characterized in that the longitudinal direction of the rod is the flow direction of the heat medium, and the heat medium and the heat storage body are brought into direct contact to exchange heat. (2) The heat storage body according to claim (1), wherein the sacred body is bound by a holding member made of thin metal wire. (3) The heat storage body according to claim (1), wherein the rods are bound together by a holding member made of a honeycomb core. (4) The heat storage body according to claim 1, wherein the rod is held in the form of a blind by a thin thread-like holding material. (5) The heat storage body according to claim 1, wherein the sacred object is held in a blind shape by a band-shaped holding material. (6) The heat storage body according to claim (1), characterized in that at least a part of the rod forming the heat storage body is reinforced with a metallic core material. ) The heat storage body according to claim 1, wherein both ends of the heat storage body are fixed by a net-like fixing material within the container.