JPH02166352A - Latent heat accumulator unit - Google Patents

Abstract

PURPOSE:To accommodate for a variation of volume of a heat accumulation material and make a uniform flow of brine in a clearance of a group of pipes by a method wherein several hollow circular tubes made of thermoplastics with their ends being expanded are bundled, flanges of the tubes are heat melted to form integral tube groups with flanges and some belows are air-tightly arranged at either one side or both sides. CONSTITUTION:Several thermoplastic tubes 1 are bundled, both ends 1A and 2A of the tubes 1 are heated and expanded. The tubes are heat melted to flanges 2 formed by thermoplastics to make an integral device of tube groups P having flanges. Tube expanded portions 1A and 2A at both ends of the tubes 1 are contacted directly to each other to heat melt them, thereby a clearance between the tubes 1 is substantially reduced. A belows 5 is fixed to one side of the group P of tubes with flanges, an interior of the bellows 5 and the tubes 1 are entirely air-sealed. Then, a heat accumulation material is enclosed within a latent heat accumulation device Q. The accumulation heat member is heat exchanged with brine blowing around an outer circumference of the tubes 1 and then a phase variation is attained during a process of heat exchanging operation and its volume is varied. This variation of volume is accommodated by the bellows 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a container for enclosing a latent heat storage body used in a regenerative air conditioning system.

[Prior Art] Conventionally, for example, when latent heat associated with phase transition from liquid to solid or from solid to liquid is used, the heat storage effect is large, and a spherical, cylindrical or flat capsule is used as the latent heat storage unit. It is known to seal the latent heat storage material by providing a volumetric expansion space therein.

Furthermore, the present inventor has recently proposed a cylindrical or prismatic capsule capable of absorbing the volumetric expansion of the latent heat storage material. (
(Patent Application No. 63-267847) [Problems to be Solved by the Invention] There are cold heat storage materials and hot heat storage materials as latent heat storage materials, but when water is used as the cold heat storage material, the phase change from liquid to solid is 9% or more. When paraffin is used as a heat storage material, its volume changes by 20% or more as the phase changes from solid to liquid.

In the case of such a large volumetric expansion, the conventional capsule method, in which a space is provided at the top of the capsule to encapsulate the heat storage material, requires a large space, and the space factor of the latent heat storage material within the capsule (inside the capsule) is large. (proportion of heat storage material in
As the space decreases, the space becomes a hindrance in terms of thermal resistance.

In addition, the patent application No. 63-2678 previously proposed by the inventor of the present invention
No. 47 is also fully capable of dealing with a volume change of around 10%, but this proposal was unable to follow a volume change of 20% or more.

Therefore, in order to make it possible to use a wide range of inorganic salts or organic latent heat storage materials that undergo a large volume change due to the phase change of the heat storage material, it is necessary to fundamentally change the way of thinking.

Furthermore, from the perspective of heat transfer from the heat medium to the heat storage material, a smaller capsule is better.Moreover, it improves the space factor of the heat storage body in the heat storage tank to increase the amount of heat storage, and also allows the heat storage material to be transferred to the heat storage material. A thin columnar shape is desirable in order to improve heat transfer, and this is also desirable from the viewpoint of crystal growth of inorganic salts and organic materials accompanying a phase change.

However, since a large number of small capsules must be placed in a heat storage tank, there are problems such as the hassle of filling the capsules with heat storage material and the need to arrange the capsules so that the flow of brine between capsules is equalized. occurs.

Therefore, this invention solves the above two problems, namely, how to absorb the volume change caused by the large phase change of the heat storage material, and the problem of mutual arrangement of a large number of capsules (heat storage bodies). It is an object of the present invention to provide a latent heat storage unit which is small in size, has a large amount of heat storage, can uniformize the flow of brine, and can be achieved by a simple manufacturing method.

[Means for Solving the Problems] In the present invention, a large number of tubes made of thermoplastics are bundled together, and a plate-like body having hollow holes made of thermoplastics at both ends is formed. A flange having a hole that exactly fits into the entire tube group is integrally fused to form one unit such as a multi-tube boiler. However, the important thing is that the tubes are not attached to flanges independently, but are in direct contact with each other. Furthermore, since only both ends of each multi-tube are deformed and enlarged, when they are integrally fused to the flange, there is a slight gap between the tubes in the middle due to this enlarged part. They are arranged side by side with regular gaps between them.

In addition, in order to absorb changes in the volume of the latent heat storage material sealed inside this multi-tube, a bellows lid is attached to one or both of the flanges to accommodate changes in the volume of the latent heat storage material ranging from a few percent to more than 20%. It can be so.

Furthermore, in a second aspect of the present invention, in the first aspect, a housing made of thermoplastic or thermosetting plastic is airtightly attached to the outside of the tube group, and brine is allowed to flow through the housing.

[Function] Gaps through which brine flows between the tubes can be obtained by expanding both ends of the multi-tube, which not only makes manufacturing easier, but also allows tube groups to be arranged with regular gaps. Because of this, the flow of brine between the multiple tubes is almost uniform. Further, by using thermoplastics, it is possible to easily apply heat to deform and expand the end of the tube, and it is also possible to heat-seal the tube and the flange or the tubes together in one step.

Furthermore, in the second invention of the present invention, by providing a housing for heat exchange between the tube group and the brine outside the tube group, the brine tank formed by the housing is reinforced by the tube group, and the brine tank This eliminates the need to use a high-strength outer panel.

[Example] Referring to FIG. 1, an example of the first aspect of the present invention will be described.

In FIG. 1(A), a large number of tubes 1 made of thermoplastics are bundled, and both ends IA and 2 of the tubes 1 are bundled together.
A is heated to expand each tube into a rectangular shape, and is heat fused and integrated with the flange 2 formed of thermoplastics.
Let it be a flanged tube group P. The tube itself is circular. By bringing the expansion parts IA and 2A at both ends of the tube 1 into direct contact with each other and heat-sealing them, the gap between the tubes 1 can be made very small and they can be arranged integrally with the flange 2. .

FIG. 1(B) shows a latent heat storage unit Q with a bellows 5 attached to one side of the flanged tube group P in FIG. 1(A).
The bellows 5 shown is attached to the flange 2, and the inside of the bellows 5 and the pipe 1 are airtightly connected. A heat storage body is sealed inside the latent heat storage body unit Q, and is immersed in brine (not shown), so that the heat storage body exchanges heat with the brine. The heat storage body undergoes a phase change during the heat exchange process, and its volume changes. The bellows 5 will absorb this volume change.

In the embodiment shown in FIG. 1, the cross-sectional shape of the deformed and expanded tube l is square, but it may be hexagonal as shown in FIG. 2, or it may be of other shapes. A combination is also possible. Furthermore, the bellows 5 may be attached to both sides of the flange 2.

On the other hand, as shown in Fig. 3, there are many holes 2A in the flange 2'.
The flange 2' and the pipe (not shown) are opened as close as possible, and the flange 2' and the pipe (not shown) are heat-sealed. This is not necessarily a desirable method because it makes it difficult to fuse and the space factor of the heat storage material deteriorates.
In the flange 2' shown in the figure, the pipe end 2A and the flange 2'
It is also possible to join them with adhesive, but it should be noted that this is not completely reliable in terms of airtightness.

Incidentally, it is necessary to circularly expand both ends of the multi-tube 1 during heat fusion to form expanded tube portions in order to achieve airtight fusion in the case of FIG. 3 as well.

Next, a second aspect of the present invention will be explained using FIG. 4.

Both ends of the pipe 1 are integrated by flanges 2, and the flange 2 is sandwiched and integrated between a flange 6 of a bellows 5 and a flange 4 of a housing 3. The bellows 5 and the tube 1 are airtightly connected, and the interior thereof is filled with a latent heat storage material. In addition, brine is allowed to flow inside the housing 3 through a flow port 8.8.
Heat is exchanged with the latent heat storage material in the tube group 1 through the gaps between the multiple tubes 1, and the outer surface of the tubes 1 is cooled or heated to store heat. Note that the lower side of the lower flange 2 is closed by a lower lid 7. The latent heat storage material sealed within the tube 1 undergoes significant expansion or contraction in volume during phase change from liquid to solid or from solid to liquid, so this is absorbed by the bellows 5. The bellows 5 may be made of plastic, metal, or rubber as long as it can withstand repeated expansion and contraction and its properties do not change due to the chemical action of the heat storage material.

Furthermore, although not shown, one or more of the heat storage units shown in FIG. 4 can be connected depending on the amount of heat storage and covered with a heat insulating case to form a larger heat storage tank.

Furthermore, the latent heat storage body can be replaced depending on the season of summer and winter by replacing the unit.

Next, the latent heat storage material will be explained in detail.

There are two types of latent heat storage materials, one for cold heat and one for heat. For cold heat, water, an aqueous sodium chloride solution, etc. can be mentioned, and for hot heat, organic compounds can be mentioned in addition to inorganic hydrated salts. Examples include aliphatic saturated hydrocarbons (waxes), aromatic hydrocarbons, phenol products, fatty acid compounds, bisphenol A-based epoxy resins, fatty acid esters and derivatives thereof, polyethylene and ethylene copolymers, and the like.

In addition, examples of thermoplastic plastics constituting flanges and pipes will be given. The materials used are classified depending on the heat storage temperature level. Polyethylene, polypropylene and nylon materials are suitable for cold and heat applications below about 70°C, and polyphenylene oxide, polycarbonate, polybutylene terephthalate, polyacetal or polyphenylene oxide, polyimide and fluorine are suitable for applications above about 80°C. Examples include resin.

As the heat storage body cools, it gradually crystallizes and contracts, but paraffins have fluidity even at the crystal transition point, so there is no particular problem with the operation of the bellows. There is no problem with organic materials, as the volume change is only a few percent at most. However, when they become solid, their thermal conductivity deteriorates, but the energy stored during the 5 to 8 hours of the night is transferred during the day. Since the heat is radiated slowly over 16 to 19 hours, there is no particular adverse effect on heat conduction from the heat storage material to the brine.

[Effects of the Invention] As explained above, the latent heat storage unit of the present invention has the following advantages: (1) The heat storage unit can be constructed by installing one or more heat storage units instead of multiple capsules. Filling the heat storage material becomes easy.

(2) Since the bellows absorbs the volume change due to the phase change of the heat storage material, a material with a volumetric expansion of 20% or more, such as aliphatic saturated hydrocarbons, especially paraffin wax, is used as the heat storage material. be able to.

(3) Since the heat storage material is divided and filled into many tubes, the brine flows through the small gaps between the tubes, so the area occupied by the heat storage material is large, and the thin tubes make it easy to store and dissipate heat. , Also, the regular distribution of the tubes makes the brine flow nearly uniform.

(4) Since many pipes are fixed to flanges to form a unit, the heat storage element can be replaced for each unit, and even if the unit is replaced, there will be no change in the brine flow. do not have.

(5) In a unit with a housing, the outer layer of the housing also serves as a brine tank, so there is no need to provide a separate brine tank, which is economical.

[Brief explanation of the drawing]

FIG. 1(A) is a perspective view showing an embodiment of a flanged tube group used in the present invention. FIG. 1(B) is a perspective view of a latent heat storage unit showing an embodiment of the present invention. 2 is a perspective view showing another flanged tube group corresponding to FIG. 1(A), FIG. 3 is a front view of an undesirable flange that can also be used in the present invention, and FIG. FIG. 2 is a side view of a latent heat storage unit showing a second embodiment of the present invention. 4... 5... 6... 7... 8... P... Q... Housing flange bellows Bellows flange Lower cover Brine flow port Flanged tube group Latent heat storage unit

Claims (2)

[Claims] (1) A large number of hollow circular tubes made of thermoplastic plastics with both ends deformed and expanded are bundled, and holes are made so as to surround the expanded portions of the hollow tubes and the group of these tubes without any gaps. Thermoplastic flanges are airtightly heat-sealed to form a flanged tube group, with bellows made of plastic, rubber, or metal on one or both sides of the tube group. A latent heat storage unit for a heat storage system, characterized in that a latent heat storage material for cold or heat is hermetically sealed in the tube group. (2) A housing made of thermoplastic or thermosetting plastic is airtightly attached to the outside of the tube group, and brine is allowed to flow through the housing.
The latent heat storage unit described.