JPS6291791A - Heat accumulating device - Google Patents

Abstract

PURPOSE:To increase the stagnating time of drips of liquid and improve the heat dissipating speed of the titled device by a method wherein bubbles are involved in the drips of liquid. CONSTITUTION:Latent heat accumulating agent 2 is in a tank 1 and heat medium 4, having a specific weight slightly larger than the same of the latent heat accumulating agent 2, is below the latent heat accumulating agent 2. Solar heat, waste heat or midnight electric power is accumulated in the latent heat accumulating agent 2 by employing a heat exchanger, a heater or the like for heating. Thereafter, a pump 9 is driven to suck the heat medium 4 through a suction pipe 11 and inject it into the latent heat accumulating agent 2 through a liquid nozzle 13 attached to the end of a discharging pipe 10. In this case, the end of the liquid nozzle 13 is provided in atmosphere above the level of liquid of the latent heat accumulating agent 2, therefore, the heat medium 4, injected out of the liquid nozzle 13, involves bubbles and the drips 5' of the liquid involving bubbles 14 are readily generated in the latent heat accumulating agent 2. As a result, the dwelling time of the drips 5' of liquid in the latent heat accumulating agent 2 may be elongated and the amount of heat, received from the latent heat accumulating agent 2 by the drips 5' of liquid, may be increased.

Description

[Detailed description of the invention] [Field of application of the invention The unspecified information relates to the structure of a latent heat type heat storage device.

[Background of the invention]

FIG. 1 shows a schematic diagram of the prior art (% 1982-14426).
(For example, the hexahydrate salt ratio calcium C,1 with a melting point of 28°C
Ctz・6khO) is contained in the F section, and a heating medium 4 (fc and chlorofluorocarbon) with a larger specific weight is contained in the F section.
It is. Further, a liquid 6 (for example, transformer oil) having a smaller specific weight than the latent heat storage material 2 is added on top of the latent heat storage material 2. Although 4 parts of the heat medium are equipped with 8 heat exchangers for heating,
Solar heat and waste heat are stored in the latent heat storage material 2 through the heat exchanger 8 and the heat medium 4. In addition, a heat exchanger 7 for heat radiation is provided in the liquid 6, and the heat held in the latent heat storage material 2 is taken out through the liquid 6 and the heat exchanger 7, and is used for hot water supply and space heating. Ru. At this time, if the heat held by the latent heat storage material 2 is transferred only from the interface with the liquid 6 that is added to the upper part, the heat radiation rate is extremely low. The latent heat storage material 2 is injected into the latent heat storage material 2 for direct catalytic heat exchange to radiate heat. That is, the heat medium 4t below the suction pipe 11 is sucked in by the pump 9, and is discharged into the liquid 6 from the discharge pipe 10.

The heat medium 4 has a larger specific weight than the liquid 6 and the latent heat storage material 2,
Droplets 5 fall in the liquid 6, and then the Urate S heat material 2
It descends completely and reaches the 4 layers of heat transfer medium at the bottom again. droplet 5
Since no other solid heat transfer surface is interposed between the latent heat storage material 2 and the latent heat storage material 2, heat can be extracted while efficiently solidifying the latent heat storage material 2, and as a result, the heat radiation rate is significantly increased. Also, due to the droplets 5 discharged from the discharge pipe 10 into the liquid 6,
The liquid 6 is made into a turbulent flow, and the thermal resistance between the liquid 6 and the heat exchanger 7 is also significantly reduced, which also contributes to improving the heat radiation rate. However, in this prior art, sufficient heat cannot be extracted unless the residence time of the droplets 5 as they descend through the latent heat storage material 2 is lengthened. Therefore, as a means to lengthen the residence time, the tank 1 is made vertically long. Therefore, the layer thickness t of the latent heat storage material 2 had to be reduced. For this reason, its uses have been limited.

[Purpose of the invention]

The object of the present invention is to overcome all the drawbacks of the prior art, to increase the residence time of the droplets, to further improve the heat dissipation rate, and to facilitate the design of the heat storage device.

[Summary of the Invention] The gist of the present invention is that in order to increase the residence time of the droplets of the heat medium in the latent heat storage material, air bubbles are incorporated into the droplets,
We have adopted a method of detaching and separating this midway,
The specific structure thereof will be explained using the following examples.

[Embodiments of the invention]

FIG. 2 is a schematic configuration diagram of the heat storage device of the present invention, and FIG. 3 is a detailed diagram of the seed part thereof. '1I11 contains latent heat storage material 2
(For example, Ca CL 2 .6 H20 with a melting point of 28°C
rSolid specific gravity t1680KLi/i, liquid specific gravity 115
00 Kq/nl), and a heat medium 4 with a slightly larger specific weight (for example, Sumitomo 3M's Freon FC-75, specific weight 1760 KIj/ze) is placed below it. A pump 9 and a heat exchanger 7 are provided between the pipe 11 and the latent heat storage material 2 as shown in the figure.
Is there a heat exchanger or heater (none of which are shown) for converting solar heat, waste heat, and late-night electricity into sword heat? It is used to store heat. After that, the Bonog 9 is driven to transfer the heat medium 4 of the -F section to the suction pipe 11.
The liquid is sucked in further and is injected into the latent heat storage material 2 from the liquid nozzle 13 attached to the end of the discharge pipe 10. At this time, the end of the liquid nozzle 13 must be placed in the atmosphere above the liquid level of the latent heat material 2 by 1 m. In this way,
The heat medium 4 ejected from the liquid nozzle 13 completely envelops the air bubbles, and even in the latent heat storage material 2, as shown in FIG.
Droplets 5' enclosing 4 are more likely to form. Such a droplet 5' initially descends in the liquid heat storage material 2 due to total inertia, but begins to rise midway due to the buoyant force based on the bubbles 14. During this rise or when reaching the liquid level, the droplet 5' releases the bubble 14 and completely falls into the latent heat storage material 2 again by gravity. Due to this phenomenon, the droplet 5'
The residence time in the latent heat storage material 2 becomes longer, and the droplets 5
' will receive more heat from the latent heat storage material 2. What is important in realizing this specifically is that the heat medium 4
It is necessary to have properties that make it easy to entrain gas when ′ is reached, and to easily release it during the process.

This is determined by the interrelationships of the heat medium 4, the latent heat storage material 2, the interfacial tension of the gas (air), the specific weight, etc.
It has been experimentally found that the above phenomenon progresses smoothly when aqueous salt (CaCtz*6H20) is combined with air. On the other hand, while the droplets 5' and 5 descend to the lower part, the latent heat storage material 2 solidifies and radiates heat to become solid.

The solid heat storage material 3 produced in this way sinks to the bottom and thickly accumulates over time on the top of the heat medium 4 as shown in the figure. The droplet 5 passes through the hole 15 formed in the deposited solid heat storage material 3, reaches the lower layer of the heat medium 4, and repeats the same cycle again.

FIG. 4 shows another embodiment. As shown in the figure, a heater 16 is disposed in the latent heat storage material 2, and the latent heat storage material 2 is heated.
At the time of heat dissipation, holes 15 are made by using manual labor to keep part of the solid heat storage material 3 deposited in the latent heat storage material 2 in a liquid state,
This is done so that the liquid m5 smoothly reaches the lower four heat medium layers.

FIG. 5 shows another embodiment. In this method, an air nozzle 17 is connected in the middle of the liquid nozzle 13, and a gas 18 (air, nitrogen, argon, etc.) is supplied to the heat medium 4 inside the liquid nozzle 13 using a compressor 19 or a cylinder. FIG. 5-a shows another embodiment in which the droplet 5' easily entraps air bubbles 14'ff. The tip 17' of the gas nozzle 17 is inserted into the liquid nozzle 13 as shown in the drawing to facilitate the mixing of air bubbles 18 into the heat medium 4 jetted from the liquid nozzle 13.

Figure 6 shows another embodiment. In this example, the liquid nozzle 13 and the gas nozzle 17 are not connected, but their tips are brought together as shown in the figure, and the heat medium 4 ejected from the liquid nozzle 13 and the gas nozzle 17 are The ejected gas is mixed with each other in the jet section.

FIG. 7 shows another embodiment. In this case, a gas nozzle 17'z is arranged around a liquid nozzle 13 in an annular manner as shown in the figure.

FIG. 8 shows another embodiment. As shown in the figure, a jet of km from the gas nozzle 17 is sprayed onto the liquid surface of the latent heat storage material.
The heat medium 4 is injected from a liquid nozzle 13 onto that part.

〔Effect of the invention〕

As described above, according to the present invention, by utilizing the property of the heat medium droplets to enclose air bubbles, the residence time of the droplets in the latent heat storage material is increased, the amount of heat received by the droplets is increased, and the heat dissipation rate is accelerated. The technology has improved 3 to 5 times.

This has made it easier to design the heat storage device.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a heat storage device of the prior art, FIG. 2 is a schematic configuration diagram of a heat storage device of the present invention, FIG. 3 is a detailed diagram of the seed part of FIG. 2, and FIGS. 5-al is a tank, 2 is a heat storage material or liquid heat storage material, 3 is a solid heat storage material, 4 is a heat medium, 5
and 5' are droplets, 6 is liquid, 7 is heat exchanger, 8 is heat exchanger, 9 is pump, 10 is discharge pipe, 11 is suction pipe, 12 is separator, 13 is liquid nozzle, 14 is bubble , 15 is a hole, 16
is a heater, 17 is a gas nozzle, 18 is a bubble%, 19 is a compressor〇

Claims (1)

[Claims] 1. A heating medium with a larger specific weight is injected into the latent heat storage material in the tank, and catalytic heat exchange is performed directly between the latent heat storage material and the heating medium to generate heat. A heat storage device in which air bubbles are trapped in droplets generated by injection of a heat medium when the heat medium is removed. 2. In order to enclose air bubbles in the droplets, place the nozzle for injecting the heat medium above the liquid level of the latent heat storage material, or place a gas nozzle at or near the liquid nozzle for injecting the heat medium. The heat storage device according to claim 1, wherein gas is mixed in when the heat medium is injected. 3. The heat storage device according to claim 1 or 2, comprising a separator for removing the gas by contacting droplets enclosing gas in the latent heat storage material in the tank. 4. The heat storage according to claims 1 to 3, which is equipped with a heater in the latent heat storage material in order to create holes through which droplets of the heat medium smoothly descend when solidified in the latent heat storage material. Device.