JPS5986894A - Regenerating method and regenerator - Google Patents

Abstract

PURPOSE:To increase the heat exchanging efficiency of a regenerator without performing a phase change between a liquid phase and a solid phase as seen in conventional regenerative substance, by mixing a substance, which absorbs and discharges the transformation heat accompanied with a phase transformation from a solid phase, with a fluid which does not dissolve with said substance, and by using a mixture as a fluidizing regenerative substance. CONSTITUTION:The numerical 1 represents crystals of regenerative material consisting of such as pentaerythritol, the numerical 2 represents a fluid which does not dissolve with the above-mentioned crystals 1 of regenerative material, the numerical 3 represents a regenerative fluid container, and the numerical 4 represents a stirrer. One or a plurality of heat transfer tube(s) 5 is/are provided in said regenerative fluid container 3, where a heating medium 6 flowing through said heat transfer tube(s) 5 exchange(s) heat with the regenerative substance. The pentaerythritol [C(CH2OH)4] being used for the material of resin, toiletry, explosive, and others, is enough to be used for a regenerative material, since its transformation heat becomes nearly 280kJ/kg at 188 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat storage method and a heat storage device using a crystal that undergoes a phase transition in the same phase as a latent heat storage material.

Among various heat storage technologies, latent heat storage has the advantage of high heat storage density and the ability to transfer heat in and out at a constant temperature.
Since the system is simple, it is a highly practical heat storage method.

However, conventional latent heat storage methods mostly involve phase change between solid phase and liquid phase. Like a latent heat storage device,
In particular, when it is important to improve the heat exchange between the heat storage material and the heat medium, heat storage materials using some special heat storage materials (Japanese Unexamined Patent Publication No. 57-76078, Japanese Patent Application No. 57-109046) ), the heat exchange is not sufficient, and this is currently a major problem in technological development.

Since the heat storage device described in the above-mentioned publication also uses polyethylene as the heat storage material, the operating temperature is also limited to about 100 to 150°C. Regarding heat storage materials used at higher temperatures, there have been proposals for various methods of promoting heat transfer, such as stirring and vibration (e.g. Electronic Technology Research Institute Vol. 45.11-12, 1981), but none of them have achieved significant results. This results in an increase in cost, and the effect of promoting heat transfer cannot be achieved when heat is input during a phase change from a solid phase to a liquid phase.

This invention was made in view of the actual situation.
Focusing on the fact that crystals that undergo a phase transition in the solid phase can be used as heat storage materials, the present invention provides a method and a heat storage device for storing thermal energy obtained from solar heat, exhaust gas, waste water, etc.

When used as a crystalline heat storage material that undergoes phase transition in the same phase,
Since there is no phase change between the liquid phase and the solid phase, it has the advantage that it is easy to take measures to improve heat exchange, and furthermore, since it is always in the solid phase, it is extremely easy to handle.

In particular, pentaerythritol (C(CH20H)4')l, which is used as a raw material for resins, cosmetics, explosives, etc.
The heat of transition at 188° C. was approximately X 280 kJ/kg, and it was found that it could be sufficiently put to practical use as a heat storage material. This invention will be explained below with reference to the drawings.

FIG. 1 is a sectional view of a heat storage device showing an embodiment of the present invention.
1 is a heat storage material crystal made of pentaerythritol etc., 2
is a fluid that does not dissolve in the heat storage material crystal 1, 3 is a heat storage container, and 4 is a stirrer. One or more heat transfer tubes 5 are provided in the heat storage container 3, and a heat medium 6 flows through the heat transfer tubes 5 to exchange heat with the heat storage material.

Unlike conventional latent heat heat storage devices, the heat storage material of the present invention has a large heat transfer area because the heat storage material inside the heat storage container 3 is dispersed in the fluid 2. can promote heat transfer.

Moreover, as shown in FIG. 2, even without stirring, the heat exchanger tube 50
If the number is increased, natural convection of the fluid 2 will occur, and heat transfer will be promoted more than in the conventional case.

FIG. 3 shows another embodiment of the present invention, in which the above-described heat storage material crystals 1 and fluid 2 are placed in a small container 10.
2 is a schematic diagram of a heat storage device in which a plurality of heat storage containers 3 are sealed, and a plurality of heat storage containers 3 are housed, and heat exchange is performed by flowing a heat medium 6 from a flow path 8 to a flow path 9 in a gap between a small container 100. FIG. For example, the small container 10 has a diameter of 1011 m+ and a length of 500 m.
It is desirable to use a material with a small heat capacity, such as a thin-walled circular pipe with a diameter of about 100 m, and a small heating element and conductive resistance in the radial direction. In this heat storage device, as in the heat storage device of the embodiment shown in FIG. 1 or 2, convection occurs around the heat storage material, so that heat transfer can be promoted.

In addition, since the heat storage material is a dispersed phase, the small container 10
It has the advantage of being extremely easy to fill and take out.

In the heat storage device shown in FIG. 4, fluid heat storage materials such as heat storage material crystals 1 and fluid 2 are stored in a heat storage container 3, and during heat storage, they are circulated through a flow path 9 to the outside of the heat storage container 3 using a pump 7. After the heat is removed by a heat exchanger 12 or the like, it is returned into the heat storage container 3 through the flow path 8. Conversely, during heat dissipation, the heat is circulated out of the heat storage container 3 through the flow path 8, and after being released to the heat exchanger 12 and the like, it is returned into the heat storage container 3 through the flow path 9.

In this case, the heat storage material crystal 1 may be prevented from coming out of the heat storage container 3 by a filter 11 as shown in FIG. When the heat storage material crystal 1 is fine, the filter 11
Because of the clogging, the above-mentioned figure 4 is preferable.
If the heat storage material crystal 1 is rough, it is difficult to smoothly feed the fluid by the pump 7, so it is better to circulate only the fluid 2 as shown in FIG.

Note that the heat storage material crystal 1 used in the heat storage device of the present invention exhibits the same effect whether it is in the form of a powder or a granule of 10 degrees or less, but if the size is larger than that, the thermal conduction resistance within the crystal increases. This is undesirable because the heat exchange performance of the heat storage device deteriorates.

In addition, if the fluid to be mixed with the crystal is a gas that does not change the properties of the crystal, it is preferably one with high specific heat and thermal conductivity, and if the fluid is a liquid that does not mix with the crystal, it has a low viscosity, specific heat, and thermal conductivity. A high ratio is preferable.

For example, when using pentaerythritol as the heat storage material, He gas, silicone oil, or hydrocarbon liquid is preferable.

As explained above, the heat storage method and heat storage device of the present invention mixes a substance that is in the same phase and absorbs and releases transition heat associated with phase transition, and a fluid that does not dissolve in the substance, and forms a fluid heat storage material. Since it is used, there is no phase change between liquid phase and solid phase as seen in conventional heat storage materials, and there is an advantage that it is easy to take measures to improve heat exchange. Furthermore, since it is always in the state of a fluid heat storage material, it is extremely easy to handle, and the structure of the heat storage device is simple, which is advantageous in terms of maintenance and inspection, and has the effect of reducing costs. ;

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a heat storage device showing one embodiment of the present invention, FIGS. 2 and 3 are schematic diagrams of a heat storage device showing other embodiments of the invention, and FIG. 4 is a heat storage method of the present invention. FIG. 5 is a schematic diagram showing one embodiment of the present invention, and FIG. 5 is a schematic diagram of a heat storage method showing another embodiment of the present invention. In the figure, 1 is a heat storage material crystal, 2 is a fluid, 3 is a heat storage container, and 4
is a stirrer, 5 is a heat exchanger tube, 6 is a heat medium, 7 is a pump, 8,
9 is a flow path, 10 is a small container, 11 is Fig. 1 - 1 - 2 5 Fig. 4 Fig. 5

Claims (1)

[Claims] (1) A material that is in the same phase and absorbs and releases transition heat associated with phase transition, and a fluid that does not dissolve in the material are mixed and used as a fluid heat storage material. A method of storing heat. (b) The heat storage method according to claim (1), characterized in that pentaerythritol is used as the substance. (3) The heat storage method according to claim (2), characterized in that helium gas, hydrocarbon liquid, or silicone oil is used as the fluid. (4) Fill a heat storage container with a fluid heat storage material that is a mixture of a material that absorbs and releases transition heat associated with phase transition in the same phase and a fluid that does not dissolve in the material, and install it in the heat storage container. A heat storage device characterized by exchanging heat with a heat medium flowing inside a heat transfer tube. (5) The heat storage device according to claim (4), characterized in that the fluid heat storage material in the heat storage container is stirred. (6) A fluid heat storage material that is a mixture of a substance that absorbs and releases transition heat associated with a phase transition in the same phase and a fluid that is incompatible with the substance is sealed in multiple small containers, and the heat medium is A heat storage device characterized by being housed in a flowing heat storage container. (7) A fluid heat storage material that is a mixture of a substance that absorbs and releases transition heat associated with a phase transition in a solid phase and a fluid that does not dissolve in the material is housed in a heat storage container, and the fluid heat storage material Alternatively, a heat storage device characterized in that only the fluid is circulated outside the heat storage container to take in and take out heat.