JPH10246584A - Heat storage unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a heat storage body against damage due to thermal expansion by laying a planar hot water pipe at least on one side of the heat storage body and providing the planar hot water pipe with a freely deformable part for absorbing thermal expansion. SOLUTION: A planar hot water pipe P is laid with the planar part thereof touching the surface of a heat storage body TR provided with a freely deformable part P1 for absorbing thermal expansion thereof by contracting the volume. The hot water pipe P has a wider surface than the heat storage body TR and the lower wall face P1 thereof touching the upper surface of the heat storage body TR is deformable freely. When the heat storage body TR is thermally expanded and the upper surface thereof bulges, only the lower wall face P1 of the hot water pipe P is recessed and the substantially fixed upper wall face P2 thereof is invariant. Consequently, the sum of cross-sectional area of the heat storage body TR and the hot water pipe P is kept constant before and after thermal expansion of the heat storage body TR thus preventing collapse of the hot water pipe P and undue deformation of the heat storage body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a heat storage device having a heat storage body.

[0002]

2. Description of the Related Art In general, a heat storage element is used to heat and store heat by being heated by various heating means, and then to radiate heat to heat or heat a desired place or part. Electric heating and hot water are currently the mainstream as heating means for the heat storage body, but hot water is more advantageous from the viewpoint of energy cost. The reasons are that (1) energy costs obtained by burning petroleum such as crude oil and kerosene are generally cheaper than inexpensive nighttime electricity, and (2) hot spring water can be used in some places. (3) hot water can be obtained by using various kinds of exhaust heat such as heat from a refuse incinerator.

[0003] Conventionally, when hot water is used as a heating means for the heat storage body, an ordinary pipe, that is, a pipe having a circular cross section, has been exclusively used for flowing hot water through the pipe.
For example, FIG. 7 is a cross-sectional view of an example of a conventional heat storage device using a hot water pipe as a heating means, and a meandering hot water pipe P is inserted between two stacked heat storage bodies TR. As is clear from FIG. 7, the hot water pipe P having a circular cross section
When the heat storage is used, only a part of the heat storage is in contact with the hot water pipe, so not only the heating efficiency is poor, but also the heating temperature of the heat storage becomes locally non-uniform and the heat storage Depending on the characteristics of the heat storage material constituting the body, the heat storage material may be greatly deformed, and in some cases, the heat storage material may be damaged. Further, since the heat storage body thermally expands when heated for heat storage, a load is applied to the pipe or the heat storage body due to this thermal expansion, and the pipe is crushed and no water flows.
Problems such as deformation of the heat storage body often occur. This problem is particularly remarkable in the case of floor heating that is buried in concrete.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to efficiently and uniformly heat a heat storage body with warm water, and to solve problems such as collapse of a pipe due to thermal expansion of the heat storage body and deformation of the heat storage body. To provide a heat storage device.

[0005]

The present invention has the following features. (1) A flat or layered heat storage body and a flat hot water pipe installed on at least one surface of the heat storage body, and the flat hot water pipe is a deformable portion capable of absorbing thermal expansion of the heat storage body. A heat storage device comprising: (2) The heat storage device according to (1), wherein the deformable portion is a surface portion of the flat hot water pipe that comes into contact with the heat storage body. (3) The heat storage device according to the above (1), wherein the deformable portion is a side portion of the flat hot water pipe. (4) The heat storage device according to any one of (1) to (3), wherein the flat hot water pipe has a larger area than the heat storage body in a contact surface between the flat hot water pipe and the heat storage body. (5) The heat storage device according to any one of (1) to (4) above, wherein the heat storage body and the flat hot water pipe are for buried floor heating buried with concrete.

[0006]

[Function] If a flat pipe is used as a hot water pipe and it is installed on one or both sides of a flat or layered heat storage body, heating can be performed with a large contact area, so that the heating efficiency is improved, and The problem of deformation or breakage of the heat storage material based on local uneven heating of the heat storage body can also be prevented. Furthermore, the flat hot water pipe has a deformable part,
Since the thermal expansion of the heat storage element is absorbed by the deformable portion, problems such as collapse of the heat storage element and deformation of the heat storage element are solved.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The heat storage material used in the present invention is composed of only the heat storage material itself, the heat storage material sealed or packaged with sheets of various materials, for example, plastic, metal, metal laminate, etc. What was accommodated in the container of such various materials may be used. Further, as the flat heat storage material, a heat storage material itself processed into a flat shape, a heat storage material sealed or packaged with the above-mentioned sheet to form a flat shape, or a heat storage material stored in a flat shape container And the like. Examples of the layered heat storage body include various types of small heat storage bodies such as spheres, blocks, long bodies, sheets, and the like, small-diameter long bodies, capsules containing heat storage materials, particularly microcapsules, and the like. , Etc. are accumulated. The thickness of the plate-shaped or layered heat storage body is not particularly limited, but is suitably 0.5 to 10 cm, especially about 1 to 5 cm.

[0008] The heat storage material constituting the heat storage body is not particularly limited, and various materials can be adopted. For example, an organic or inorganic heat storage material that transitions from a solid heat dissipation state to a liquid to solid heat storage state, for example, a mixed composition of paraffin, wax, and an organic polymer is exemplified. In particular, among the above-mentioned mixed compositions, those which exhibit a solid state not only in the heat dissipation state but also in the heat storage state, or at least a semi-solid state having at least a small flow deformation property are particularly preferable. The reason is that such a heat storage material can form a plate-shaped or layered heat storage material by itself, even if it is used by being wrapped or housed in a sheet or container.
This is because there is no problem of leakage when a possible sheet or container is damaged.

The above-mentioned solid or semi-solid heat storage material includes paraffin wax such as normal paraffin, and 100 parts by weight of wax such as higher alcohol.
-30 parts by weight of organic polymer, especially styrene-ethylene-
Styrene-based thermoplastic elastomers such as propylene-styrene-block copolymer, styrene-isoprene-styrene-block copolymer, olefin-based thermoplastic elastomers such as blends of olefin-based rubber and olefin-based resin, ethylene-vinyl acetate copolymer Examples thereof include a composition obtained by mixing a thermoplastic elastomer such as a coalescable elastomer and a copolymer, and those described in JP-A-4-85387.

The flat hot water pipe used in the present invention is generally made of metal such as copper, stainless steel or aluminum, polyethylene, cross-linked polyethylene, polypropylene, poly-4-methylpentene-1, polyvinyl chloride, It may be made of an organic polymer such as nylon, polyester, or phenol resin. The hot water pipe is laid and used in a state where its flat plate portion is in contact with the surface of the heat storage body, and when the heat storage body is heated for heat storage and thermally expanded, absorbs the thermal expansion and shrinks its own volume. It has a deformable part so that it can be performed. Since the deformable portion has such a function, it has been thermally expanded such as a thin plate of a metal such as copper or aluminum, a flexible or elastic material such as a thermoplastic organic polymer or a crosslinked rubber, or a bellows structure made of various plate materials. It is formed of a material or a structure that is easily deformed by the pressing force of the heat storage body.

However, the entire hot water pipe may be a deformable portion, and the hot water pipe may be entirely deformed. As shown in FIGS. 3 and 4 described below, the hot water pipe is in contact with the heat storage body of the hot water pipe. A portion of the hot water pipe may be a deformable portion, such as only a surface portion to be formed, or only a side surface portion of a flat hot water pipe as shown in FIGS. 5 and 6 described later.

The non-deformable portion of the hot water pipe having the non-deformable portion may be formed of a normal hot water pipe material, for example, copper or aluminum, or may have a rigid structure made of the same material as the deformable portion. There may be. When the deformable portion and the non-deformable portion are made of different materials, a stable connection between the two portions is required. Therefore, it is preferable that both portions are made of the same material from the viewpoint of ease of manufacturing the hot water pipe. .

Hereinafter, the present invention will be described in more detail with reference to the drawings. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a partial top view of FIG. 1, FIGS. 3 and 4 are partial sectional views of another embodiment of the present invention, and FIGS. FIG. 9 is a partial cross-sectional view of still another embodiment. 1 to 6, the same parts are denoted by the same reference numerals.

[0014]

1 and 2 show an embodiment in which the present invention is applied to floor heating of a concrete buried type. Reference numeral 7 denotes a slab, 8 denotes a heat insulating layer, and a large number of sheets are provided on the heat insulating layer 8. Heat storage TR
Are arranged at a fixed interval from each other, and a flat hot water pipe P is placed on the cloth so that the heat storage body TR can be heated from above. 9 is a wire mesh, 10 is a regenerator TR, a hot water pipe P, and a wire mesh 9
Buried concrete. The flooring 6 is stretched on the concrete 10 via the heat equalizing plate layer 5.

FIG. 2 is a top view showing the arrangement of only the regenerator TR and the hot water pipe P in FIG. A long hot water pipe P having a rectangular cross section in a direction perpendicular to the longitudinal direction is laid in a stripe shape on a heat storage body TR indicated by dotted lines arranged at equal intervals in both the vertical and horizontal directions. Hot water W is flowed in P. Therefore, when it is considered that a large number of heat storage elements TR are composed of a number of vertical arrangement groups, the individual heat storage elements TR in a certain vertical arrangement are as follows.
It is heated by one hot water pipe P.

A large number of hot water pipes P laid in a stripe shape are connected to each other at each end, resulting in a state in which one pipe is meandering, and both ends are outside the floor heating system. Connected to a hot water tank (not shown) installed at The hot water W in the hot water tank is maintained at a required temperature by using electric power at night, etc., is fed by an appropriate pressurizing means as necessary, passes through a meandering pipe-shaped hot water pipe P, and is again heated with hot water. Return to tank. Thus, the heat storage TR is effectively heated by the hot water pipe P.

3 and FIG. 4, FIG. 3 shows the heat storage unit TR and the hot water pipe P in a stage before the heat storage unit TR is heated.
On the other hand, FIG. 4 shows both states when the heat storage body TR is heated and thermally expanded. In this embodiment, the hot water pipe P has a surface wider than the surface of the heat storage body TR as shown, and a lower surface wall P1 that is in contact with the upper surface of the heat storage body TR is a deformable portion. Therefore, heat storage TR
Is heated and thermally expanded, and the upper surface thereof rises, the hot water pipe P is substantially fixed by the concrete 10, the upper surface wall P2 remains unchanged, and only the lower surface wall P1 receives the pressing force of the heat storage body TR. And recessed as shown in FIG. Thus, since the sum of the cross-sectional areas of the heat storage body TR and the hot water pipe P before and after the thermal expansion of the heat storage body TR is practically kept unchanged, the collapse of the hot water pipe P and the excessive deformation of the heat storage body are prevented. Is done.

Although the internal volume of the hot water pipe P decreases due to the dent, since both ends of the hot water pipe P open into the hot water tank, the portion of the hot water W rejected due to the decrease in the internal volume of the hot water pipe P is reduced. It will be transported into the hot water tank. In the ordinary floor heating, the decrease in the internal volume of the hot water pipe P due to the above-mentioned dent depends on the temperature difference between the hot water W and the room temperature, but is about 5 to 10% of the initial volume thereof. There is practically no problem from above.

Since the hot water pipe P shown in FIGS. 3 and 4 has a surface wider than the surface of the heat storage body TR, both end portions P3 protruding from the heat storage body TR are also affected by the thermal expansion of the heat storage body TR. The product remains unchanged, which is effective in securing the flow rate of the hot water W.

5 and FIG. 6, FIG. 5 shows a state in which the regenerator TR and the hot water pipe P are in a stage before the regenerator TR is heated.
On the other hand, FIG. 6 shows both states at the stage where the heat storage body TR is heated and thermally expanded. In this embodiment, the lower surface wall P1 of the hot water pipe P is a non-deformable portion, and its side portion P4 is a deformable portion having a bellows structure. Therefore, when the heat storage body TR expands so that the upper surface thereof is lifted at substantially the same level by heating and presses the hot water pipe P, the bellows structure of the side portion P4 of the hot water pipe P contracts, and as shown in FIG. The thickness of the pipe is reduced by an amount corresponding to the expansion of the body TR.

As shown in FIG. 3, the width W2 of the hot water pipe P may be wider than the width W1 of the heat storage body TR, and as shown in FIG. 5, W2 and W1 may be approximately the same. Also W
2 may be smaller than W1, for example, W2 may be smaller by 70% or more of W1. However, from the viewpoint of effectively absorbing the expansion of the heat storage body TR by the deformation of the hot water pipe P, W2 is preferably equal to or greater than W1.

When the flow of the hot water W in the hot water pipe P has a large Reynolds number of, for example, 1000 or more and shows sufficient turbulence, the hot water W in the pipe P is substantially uniform, Thus, the entire surface of the heat storage body TR can be sufficiently uniformly heated. On the other hand, the hot water W in the pipe P
When the flow rate of the hot water W is small, the hot water W exhibits a laminar flow and flows by selecting the flow path with the least flow resistance in the pipe P, and the other portion may become a stagnation point and decrease in temperature. In such a case, if necessary, it is preferable to take a well-known means for preventing the formation of stagnation points, such as appropriately installing one or more baffles in the hot water pipe P.

The thickness of the heat storage body TR is usually 0.5 to 20.
3 and 5, when heating from one side of the heat storage body TR as in the embodiment of FIGS. 3 and 5, the thickness of the hot water pipe P before deformation is about 2 to 50 mm as a distance between inner walls thereof.
In particular, about 5 to 10 mm is appropriate. In an embodiment in which heat storage bodies are installed above and below a single flat hot water pipe P and the two layers of heat storage bodies are heated, a hot water pipe having a thickness twice as large as the above is used, or It is advisable to double the flow rate of the hot water W by using the same thickness as that described above.

The present invention can be applied not only to the floor heating system buried in concrete but also to a floor heating structure system of a joist. Particularly, when the space for installing the hot water pipe and the heat storage element is narrow, the thermal expansion of the heat storage element causes a problem that the hot water pipe and / or the heat storage element may be damaged.

[0025]

According to the heat storage device of the present invention, since the heat storage material can be heated with high efficiency using hot water which is less expensive than heating by electric power, various types of heat storage type floor heating such as a concrete buried type and a joist type can be used. It can be used suitably.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a partial top view of FIG.

FIG. 3 is a partial sectional view of another embodiment of the present invention.

FIG. 4 is a partial sectional view of another embodiment of the present invention, which is the same as FIG.

FIG. 5 is a partial sectional view of still another embodiment of the present invention.

FIG. 6 is a partial sectional view of still another embodiment of the present invention, which is the same as FIG.

FIG. 7 is a sectional view of a conventional heat storage device.

[Explanation of symbols]

 TR Heat storage element P Hot water pipe W Hot water 5 Heat equalizing plate layer 6 Flooring 7 Slab 8 Heat insulation layer 9 Wire mesh 10 Concrete

Claims (5)

[Claims] 1. A flat or layered heat storage body and a flat hot water pipe installed on at least one surface of the heat storage body, and the flat hot water pipe is capable of absorbing thermal expansion of the heat storage body. A heat storage device having a free part. 2. The heat storage device according to claim 1, wherein the deformable portion is a surface portion of the flat hot water pipe that contacts the heat storage body. 3. The heat storage device according to claim 1, wherein the deformable portion is a side portion of the flat hot water pipe. 4. The heat storage device according to claim 1, wherein the flat hot water pipe has a larger area than the heat storage body at a contact surface between the flat hot water pipe and the heat storage body. 5. The buried floor heating system, wherein the heat storage body and the flat hot water pipe are buried in concrete.
A heat storage device according to any one of claims 1 to 4.