JPH0933184A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger wherein air does not dwell in a heat exchange device in a housing, and a rapid heat exchange rate is achieved. SOLUTION: A heat exchanger includes a substrate comprising low crystallizability polyolefin with crystallization of 40% or less, a heat storage unit 1 taking as a constituent material an organic heat storage material carried on the substrate and rendered to reversible phase transition between solid and liquid phases, a heat exchange device 3 having a heat medium flow passage 2 making direct contact with the heat storage unit 1, and a housing 4 for housing the heat exchange device 3 in a housing chamber 10 therein. The heat storage unit 1 is an assembly of pellet like particles having a heat storage property, and includes a rectifier plate 11 before and after the housing chamber 10 where a heat medium flows horizontally. A ceiling of the housing chamber 10 comprises a partition plate 8 having a plurality of through-holes 9 each having a smaller diameter than that of the particle, and further includes a gap 7 serving as a vent passage between the partition plate 8 and an upper inner surface 4a of the housing 4. Air in the heat exchange device 3 passes through the through-holes 9 in the partition plate 8 and gathers to the gap 7 so that the flow passage 2 for the heat medium is prevented from being obstructed by the air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger having a heat storage body that utilizes latent heat associated with a phase transition.

[0002]

2. Description of the Related Art Various heat exchangers using a latent heat storage material capable of storing a large amount of heat at a constant temperature have been proposed. For example, when a capsule heat exchanger is shown in FIG. 2A, the heat medium inlet 15 and outlet 16 are provided on the front and rear end surfaces of the housing 14, and the latent heat shown in FIG. The heat storage material 17 in which the heat storage material 18 is sealed in the container 13 is filled, and the heat medium is flown into the housing 14 filled with the heat storage material 17 to perform heat exchange. However, in the case where the flow of the heat medium flows in the horizontal direction like the heat exchanger, the air may stay in the housing 14. The staying air blocks the flow path of the heat medium, so that the speed of heat exchange is slowed down.

[0003]

Further, in the above heat exchanger, since the latent heat storage material 18 is contained in the container 13 to prevent the liquid from flowing out when the latent heat storage material 18 becomes liquid due to the phase transition, Since the exchange speed is slow and the latent heat storage material 18 is enclosed in the container 13, it is difficult to reduce the size of the container 13 and increase the surface area. As a solution to this problem, there has been proposed a heat exchanger in which a solvent is brought into direct contact with a heat storage material in which a resin supports an organic heat storage material.

The present invention has been made in view of the above facts, and an object of the present invention is to provide a heat exchanger in which air does not stay in the heat exchange element in the housing and the heat exchange rate is high. Especially.

[0005]

A heat exchanger according to claim 1 of the present invention comprises a substrate made of a low crystalline polyolefin having a crystallinity of less than 40%, and a solid-liquid phase supported on the substrate. A heat accumulating element 3 having a heat storage element 1 made of an organic heat storage material that reversibly undergoes a phase transition between the heat storage element 1 and a heat medium flow path 2 in direct contact with the heat storage element 1, and a heat exchange element 3 in a housing 4. In the heat exchanger housed in 10, the heat storage body 1 is an aggregate of particles having a heat storage property in the form of pellets, and rectifying plates 11 are provided before and after the storage chamber 10 to heat the inside of the storage chamber 10. While the medium flows in the horizontal direction, the ceiling of the storage chamber 10 is composed of a partition plate 8 having a plurality of through holes 9 smaller than the particle diameter, and the partition plate 8 and the housing 4 are provided.
It is characterized by having a gap 7 serving as a ventilation path between the upper inner surface 4a and the upper inner surface 4a.

A heat exchanger according to a second aspect of the present invention is the heat exchanger according to the first aspect, characterized in that the partition plate 8 has a mesh shape.

A heat exchanger according to claim 3 of the present invention is the heat exchanger according to claim 1 or 2, wherein the heat storage body 1 further comprises a crystalline polyolefin having a crystallinity of 40% or more. It is characterized by

The heat exchanger according to claim 4 of the present invention is the heat exchanger according to any one of claims 1 to 3, wherein the organic heat storage material is a crystalline alkyl hydrocarbon, a crystalline fatty acid, and a crystal. It is characterized by being at least one selected from the group of fatty acid esters.

A heat exchanger according to claim 5 of the present invention is the heat exchanger according to any one of claims 1 to 4, wherein the heat medium is ethylene glycol, propylene glycol,
And at least one selected from water.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1A is a sectional perspective view of a heat exchanger according to an embodiment of the present invention, and FIG. 1B is a vertical sectional view thereof.

The heat exchanger of the present invention houses the heat exchange element 3 in the housing 4. The heat storage body 1 constituting the heat exchange element includes a low-crystalline polyolefin having a crystallinity of less than 40% and a solid-crystalline polyolefin supported on the low-crystalline polyolefin.
An organic heat storage material that undergoes a reversible phase transition between liquids is used as a constituent material.

The above-mentioned low crystalline polyolefin includes
Examples thereof include copolymers of ethylene and α-olefin and atactic polypropylene, and as the α-olefin, propylene, butene-1, pentene, hexene-1, 4-methylpentene-1, octene-1, etc. Among these, but not limited to, propylene and butene-1 are preferable, and propylene is particularly suitable. The low crystallinity polyolefin has a crystallinity of less than 40% by X-ray diffractometry. Crystallinity is 40
% Of low crystalline polyolefin is used as a carrier for the organic heat storage material, the elution of the organic heat storage material from the heat storage body 1 is prevented, and as a result, the heat medium is brought into direct contact with the resin for heat exchange. can do. From the viewpoint of elution, the crystallinity of this low crystalline polyolefin is more preferably 30% or less, and most preferably 20% or less.

In order to improve the strength of the heat storage body 1, the heat storage body 1 has a shape of the heat storage body 1 when a crystalline polyolefin having a crystallinity of 40% or more is used as the resin together with the low crystalline polyolefin. The holding power can be increased. In particular, the crystallinity of low crystalline polyolefin is 30
% Or less is particularly effective. Examples of the crystalline polyolefin include ethylene-α-olefin copolymer, medium density polyethylene, and high density polyethylene. The medium-density polyethylene and the high-density polyethylene are specified in JIS-K-6760.

The organic heat storage material is a substance having a property of reversibly undergoing a solid-liquid phase transition, and has a crystallinity of 40.
%, It is desirable to have compatibility with the low-crystalline polyolefin of less than%, and when using the above-mentioned crystalline polyolefin having a crystallinity of 40% or more, it is desirable to have compatibility with the crystalline polyolefin. The organic heat storage material has a lighter specific gravity than a heat medium, and examples thereof include hydrocarbons such as paraffin, paraffin wax, isoparaffin, and polyethylene wax, fatty acids, and fatty acid esters (hereinafter referred to as fatty acids). To be These may use only 1 type and may use 2 or more types together. When the heat medium, which is a medium for heat exchange, contains water, hydrocarbons are preferable because they deteriorate fatty acids. The organic heat storage material is preferably a crystalline substance having a heat of fusion of 20 cal / g or more from the viewpoint of securing a heat storage amount.

The blending ratio of the low crystalline polyolefin and the organic heat storage material used in the present invention is appropriately determined depending on the use of the heat storage body 1. For example, the low crystalline polyolefin is 10 to 70% by weight, and the organic heat storage material is organic. 30 to 90 for heat storage materials
Weight percent is suitable. If the ratio of the low crystalline polyolefin is less than the above range, the organic heat storage material is the flow path 2 of the heat medium.
If the ratio of the organic heat storage material is less than the above range, the heat storage amount may be too low.

Further, when a low crystalline polyolefin and a crystalline polyolefin are used as the resin, the compounding ratio is, for example, 5 to 60 for the above low crystalline polyolefin.
% By weight, the crystalline polyolefin is 0 to 65% by weight,
30 to 90% by weight of organic heat storage material, but total resin is 1
0 to 70% by weight is suitable. When the ratio of the low crystalline polyolefin is less than the above range, the organic heat storage material may be eluted into the flow path 2 of the heat medium, and the ratio of the low crystalline polyolefin and the crystalline polyolefin is within the above range. If it exceeds the limit, the heat storage amount tends to decrease.

The organic heat storage material can be supported on the resin by, for example, kneading at a temperature higher than the melting point of the resin with a kneader or the like and molding the molten mixture. The heat storage body 1 can be manufactured by a usual plastic molding method such as extrusion molding or injection molding.
In addition to the resin and the organic heat storage material, if necessary, various inorganic fillers, flame retardants, antioxidants,
Metal fibers, glass fibers, whiskers and the like may be added and dispersed.

The heat medium has a higher specific gravity than the organic heat storage material, and examples thereof include various liquids such as water, ethylene glycol, propylene glycol, and aqueous solutions thereof.

In the heat exchanger of the present invention, as shown in FIGS. 1 (a) and 1 (b), the heat exchange element 3 is housed in the housing 4.
A storage room 10 is provided. Further, a heat medium inlet 5 is provided in the lower front end surface of the housing 4, and a heat medium outlet 6 is provided in the upper rear end surface, and the upper inner wall of the outlet 6 is at the same height as the upper inner surface 4a of the housing 4. positioned. The heat exchange element 3 includes a heat storage body 1 and a flow path 2 that directly contacts the heat storage body 1.
Is provided. The heat storage body 1 that constitutes the heat exchange element 3 is an aggregate of particles having a heat storage property in the form of pellets,
The flow path 2 for the heat medium is a void between the particles. Before and after the storage chamber 10 in the housing 4, a rectifying plate 11 that makes the flow of the heat medium constant is provided. The heat medium flows in the housing 4 in a substantially horizontal direction.

In the heat exchanger, the storage chamber 10
The ceiling is composed of a partition plate 8 having a through hole 9 smaller than the diameter of the particles, and further has a gap 7 serving as a ventilation path between the partition plate 8 and the upper inner surface 4a of the housing 4. When the partition plate 8 having the through hole 9 is provided, the air in the heat exchange element 3 passes through the through hole 9 and is collected in the gap 7, so that the flow path 2 of the heat medium in the heat exchange element 3 is air. It does not interfere. Thereafter, the air collected in the gap 7 flows together with the heat medium through the gap 7 as a ventilation path, and is eventually discharged from the outlet 2. Therefore, since the air does not obstruct the flow path 2 of the heat medium, the heat exchanger is maintained at a high heat exchange rate. In particular, it is preferable that the partition plate 8 has a mesh shape because air can be quickly discharged from the heat exchange element 3.
The partition plate 8 is not limited to the mesh shape as long as it has the through holes 9 smaller than the particle diameter, and may be a plate having a large number of punching holes. Further, since the air gap 7 is provided, even if the air is not completely discharged from the housing 4, it does not remain in the heat exchange element 3, so that it is possible to prevent the heat exchange rate from decreasing due to the staying air.

The upper inner surface 4a of the housing 4 and the partition plate 8 are preferably provided with a coating for preventing air from adhering so that the collected air is easily discharged. Examples of the coating include a fluororesin coating.

The embodiment of the present invention is not limited to the above. For example, the storage room 10 may be one room shown in the drawing, or may be further divided into a plurality of rooms. (Not shown) The heat exchanger of the present invention is a radiator that discharges the supplied heat from a heat medium, a pump that circulates the heat medium, and a heat source that heats the heat medium, etc., connected by piping. By circulating a heat medium, it is used for a heat exchange device that stores and dissipates heat.

[0023]

The heat exchanger according to the first to fifth aspects of the present invention is provided with the partition plate 8 having the through holes 9 smaller than the diameter of the particles of the heat storage body 1, so that the air inside the heat exchange element 3 is Since the air passes through the through holes 9 and collects in the gap 7, the air staying in the flow path 2 for the heat medium does not interfere with the air. As a result, since the air does not obstruct the flow path 2 of the heat medium, the heat exchanger is maintained at a high heat exchange rate.

Further, in the heat exchanger according to the second aspect of the present invention, the heat exchanging element 3 is particularly preferable because the partition plate 8 has a mesh shape.
Air is quickly discharged from inside.

Further, since the heat exchanger according to the third aspect of the present invention uses the crystalline polyolefin having a crystallinity of 40% or more as a constituent material, the strength of the heat storage body 1 is improved.

[Brief description of drawings]

FIG. 1A is a sectional perspective view of a heat exchanger according to an embodiment of the present invention, and FIG. 1B is a vertical sectional view thereof.

FIG. 2A is a vertical sectional view of a conventional heat exchanger,
(B) is sectional drawing of the heat storage body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat storage body 2 Flow path 3 Heat exchange element 4 Housing 4a Upper inner surface 5 Inlet 6 Outlet 7 Gap 8 Partition plate 9 Through hole 10 Storage chamber 11 Rectifying plate

Front page continued (72) Inventor Ryo Sugawara 1048, Kadoma, Kadoma, Osaka Prefecture, Matsushita Electric Works Ltd. (72) Inventor, Kenji Tsubaki, 1048, Kadoma, Kadoma, Osaka Matsushita Electric Works, Ltd. Person Soichiro Kawada 1048 Kadoma, Kadoma-shi, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (5)

[Claims] 1. A substrate comprising a low crystalline polyolefin having a crystallinity of less than 40%, and a solid phase-supported on the substrate.
A heat exchange element including a heat storage body (1) having an organic heat storage material that reversibly undergoes a phase transition between liquid phases as a constituent material, and a flow path (2) for a heat medium that is in direct contact with the heat storage body (1). A heat exchanger, wherein (3) is housed in a housing chamber (10) in a housing (4), wherein the heat storage body (1) is an aggregate of particles having a pellet-like heat storage property, and the storage room ( 10) is provided with straightening vanes (11) before and after, the heat medium flows horizontally in the storage chamber (10), and the ceiling of the storage chamber (10) is
It is composed of a partition plate (8) having a plurality of through holes (9) smaller than the particle diameter, and serves as a ventilation path between the partition plate (8) and the upper inner surface (4a) of the housing (4). A heat exchanger having a gap (7). 2. The heat exchanger according to claim 1, wherein the partition plate (8) has a mesh shape. 3. The heat storage body (1) further has a crystallinity of 4
The heat exchanger according to claim 1 or 2, wherein 0% or more of crystalline polyolefin is used as a constituent material. 4. The organic heat storage material according to claim 1, wherein the organic heat storage material is at least one selected from crystalline alkyl hydrocarbons, crystalline fatty acids, and crystalline fatty acid esters. Heat exchanger. 5. The heat exchanger according to claim 1, wherein the heat medium is at least one selected from ethylene glycol, propylene glycol, and water.