JPH07243786A - Heat storage equipment - Google Patents

Abstract

PURPOSE:To intercept oxygen in air from the part of an air-liquid interface of a heat exchanger by putting a heat-shrinkable tube on it for preventing it from corroding due to the effects of the oxygen in the air and a heat storage material in the case when the heat exchanger is immersed in a tank holding the heat storage material. CONSTITUTION:A heat storage material (e.g. calcium chloride hexahydrate, sodium chloride) 2 is held in a tank frame 1 and a heat exchanger (a copper pipe, an aluminum pipe or the like) 3 is immersed therein. In order to make a heat medium flow through the heat exchanger 3, pipes 8 and 8a need to be provided at inlet and outlet parts of the heat exchanger 3 respectively. The pipes 8 and 8a are so provided as to extend above an air-liquid interface 5 of the heat storage material 2 and they are led outside through a cover plate 4. Since air exists in a space between the air-liquid interface 5 of the heat storage material 2 and the cover plate 4, tubes 7 and 7a are put on the parts of the air-liquid interface 5 of the pipes 8 and 8a so as to intercept oxygen in the air. Parts between the cover plate 4 and the pipes 8 and 8a are sealed with sealing materials 10 and 10a so that fresh air may not enter a space part 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage device containing a heat storage material and a heat exchanger.

[0002]

2. Description of the Related Art In a conventional heat storage device, a heat exchanger (using a copper pipe, an aluminum pipe, etc.) is immersed in a heat storage material (for example, latent heat storage material such as calcium chloride hexahydrate) in a tank frame. The heat medium is passed through the heat exchanger to store heat in the heat storage material, or to generate heat from the heat storage material, but air is present in the space between the tank frame and the heat storage material, and at this gas-liquid interface. The heat exchanger located could be corroded under the influence of oxygen in the air and the heat storage material. An example of such a conventional heat storage device is Japanese Patent Application No. 53-7982.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to prevent corrosion of the gas-liquid interface of a heat exchanger immersed in a heat storage material.

[0004]

As a method of preventing corrosion of the heat exchanger at the gas-liquid interface, a tube (coating or spraying silicon oil or the like on the surface of the heat exchanger located at the gas-liquid interface is used. Cover (including heat shrink tubing),
The solution is to apply resin or the like, expel air in the space between the tank frame and the heat storage material (vacuum state or replace with an inert gas such as nitrogen).

[0005]

The above-mentioned methods (1) to (3) prevent oxygen in the air from coming into contact with the heat exchanger located at the gas-liquid interface.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of an embodiment of the present invention.
A heat storage material (eg, calcium chloride hexahydrate having a melting point of 28 ° C., sodium chloride salt having a melting point of −21 ° C.) 2 is contained in a tank frame (stainless steel, etc.) 1, and a heat exchanger (copper pipe, aluminum). 3) is immersed.
Since a heat medium (such as chlorofluorocarbon) flows through the heat exchanger 3, it is necessary to provide pipes 8 and 8a through which the heat medium flows at the inlet and outlet portions of the heat exchanger 3. The pipes 8 and 8a are arranged so as to extend above the gas-liquid interface 5 of the heat storage material 2, and are taken out through the lid plate 4 to the outside. The pipes 8 and 8a may be connected to other pipes 9 and 9a by welding and extended. Reference numerals 11 and 11a are welded portions. Heat storage material 2
Since air is present in the space 6 between the gas-liquid interface 5 and the lid plate 4 in this embodiment, a tube (heat shrinkage of polyethylene, Teflon, etc.) is formed at the gas-liquid interface 5 of the pipes 8 and 8a in this embodiment. A tube or the like) 7 or 7a is covered to block oxygen in the air. Also, the lid plate 4 and the pipes 8 and 8a
It is preferable that new air is prevented from entering the space portion 6 by sealing with the sealing materials 10 and 10a between and. Before covering the tubes 7, 7a, the pipe 8,
Applying silicone oil, etc. on the surface of 8a (including spray application)
After that, it is effective to cover the tubes 7 and 7 and apply heat to shrink the tubes to bring them into close contact. Even better effects can be obtained by applying an epoxy-based or urea-based paint instead of silicone oil.

FIG. 2 is an explanatory view of another embodiment of the present invention. In this embodiment, the tubes 7 and 7a are elongated and
It extends to the upper part of the lid plate 4. In this way, there is no portion where the pipes 8 and 8a are exposed in the space 6, and there is a further effect. In addition, to further enhance the effect, the space 6
It is advisable to expel the air to a vacuum, or to inject an inert gas (such as nitrogen). Pipes 12, 12
a is a pipe used to expel air. The pipes 12 and 12a can also be used for injecting an inert gas. 13 and 13a are sealing parts, which are preferably sealed with solder or silver solder. The pipes 12 and 12a do not have to be provided in the lid plate 4 or the tank frame 1 separately in two places, but pipes having different diameters may be provided concentrically and integrally formed.

FIG. 3 is an explanatory view of another embodiment of the present invention. This is effective when the pipes 8 and 8a connected to the heat exchanger 3 are structured so as to project to the outside from the side wall or the bottom plate of the tank frame 1. When the heat storage material 2 is a latent heat storage material, the liquid heat storage material 2b has a lower density than the solid heat storage material 2a, and when the heat storage material 2 receives heat from the heat exchanger 3 and becomes the liquid heat storage material 2a, its volume is Expands. For this reason, there is no escape place for the liquid heat storage material 2a, and a large force is applied to the tank frame 1 and it may be damaged. Therefore, in this embodiment, a part of the heat exchanger 3 is raised to 3a so as to face the upper portion of the interface 5. In this way, the heat exchanger 3
The liquid heat storage material 2a that has melted around is immediately escaped to the upper part of the gas-liquid interface 5, and pressure is not applied to the tank frame 1. However, since the heat exchanger 3a that has been started up exists in the space 6, oxygen existing in the space 6 causes the heat exchanger 3a at the gas-liquid interface 5 to corrode. Therefore, in this embodiment, the heat exchanger 3a is covered with the tube 7. In this way, the heat exchanger 3a that is erected above the gas-liquid interface 5 is
It is unaffected by oxygen and therefore its corrosion is very low.

Table 1 shows a comparison of copper pipe test pieces, which have been subjected to various measures, after being immersed in sodium chloride salt for 1000 hours at room temperature to determine the corrosion rate.

[0010]

[Table 1]

In the conventional product, a copper pipe alone is half-immersed in a sodium chloride salt, and the rest is exposed above the gas-liquid interface. The corrosion rate of this conventional product is set to 1 and is expressed as a ratio in other cases. Is a polyethylene heat-shrinkable tube covering the gas-liquid interface of a copper pipe, and the corrosion rate ratio is as small as 0.025. Is sprayed with silicone oil on a copper pipe and covered with a heat-shrinkable tube.
It becomes smaller as 016. Is a urea resin paint, dried and then covered with a heat-shrinkable tube.
It becomes even smaller at 07. Is sprayed with silicon oil on a copper pipe, covered with a heat-shrinkable tube, and the air on the gas-liquid interface is replaced with nitrogen. Is a copper pipe coated with a urea resin coating and then covered with a heat-shrinkable tube, and the air on the gas-liquid interface is replaced with nitrogen. Similar tests were conducted on finned copper pipes, aluminum pipes, finned aluminum pipes, etc., but the same effect was obtained.

[0012]

According to the present invention, the corrosion rate of the gas-liquid interface of the heat exchanger material immersed in the heat storage material is remarkably reduced, which is convenient for practical use.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of a heat storage device of the present invention.

FIG. 2 is an explanatory diagram of a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of a third embodiment of the present invention.

[Explanation of symbols]

1 ... Tank frame, 2 ... Heat storage material, 3 ... Heat exchanger, 4 ... Lid plate, 5
... gas-liquid interface, 6 ... space, 7, 7a ... tube, 8, 8a
... pipe, 9,9a ... pipe, 10,10a ... sealant, 11,11a ... welded part, 12,12a ... pipe, 1
3, 13a ... Seal part.

Claims (10)

[Claims] 1. A heat storage device in which a heat storage material is housed in a tank frame and a heat exchanger is immersed in the heat storage material, wherein a part of the heat exchanger is disposed above a gas-liquid interface of the heat storage material. If
A heat storage device characterized in that the heat exchanger material around the gas-liquid interface is subjected to anticorrosion measures. 2. The anticorrosion measure according to claim 1,
A heat storage device in which a tube is covered on the heat exchanger material around the gas-liquid interface of the heat storage material. 3. The anticorrosion measure according to claim 1,
A heat storage device in which oil or paint is applied to the heat exchanger material around the gas-liquid interface of the heat storage material. 4. The anticorrosion measure according to claim 1,
A heat storage device in which a tube is covered after applying oil or paint to the heat exchanger material around the gas-liquid interface of the heat storage material. 5. The anticorrosion measure according to claim 1,
A heat storage device in which air above the gas-liquid interface of the heat storage material is expelled to introduce nitrogen. 6. The anticorrosion measure according to claim 1,
After applying oil or paint to the heat exchanger material around the gas-liquid interface of the heat storage material, cover the tube and expel the air above the gas-liquid interface of the heat storage material to create a vacuum, or introduce an inert gas. Heat storage device. 7. The heat storage device according to claim 2, wherein the tube is a heat shrink tube. 8. The heat storage device according to claim 1, 2, 3, 4, 5 or 6, wherein the heat exchanger material is a pipe. 9. The heat exchanger material according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the heat exchanger material around the gas-liquid interface of the heat storage material is an inlet portion of a heat medium to the heat exchanger. Or a heat storage device that is an outlet. 10. The heat exchanger material according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the heat exchanger material near the gas-liquid interface of the heat storage material is an inlet portion of a heat medium of the heat exchanger material. A heat storage device that is a heat exchanger material between the outlets.