JPH02219987A - Heat accumulator - Google Patents

Abstract

PURPOSE:To improve heat accumulation efficiency compactly by disposing two heat exchangers formed with many styluslike fins in parallel with heat accumulation agent on the outer surface of a tube, and disposing both the exchangers at positions where the fin of one exchanger is intruded into that of the other exchanger. CONSTITUTION:Low temperature and low pressure fluorocarbon liquid refrigerant is supplied, for example, to a tube 22 of a heat accumulation heat exchanger 20. Heat accumulation agent 16 in contact with the exchanger 20 is cooled with low temperature liquid refrigerant to be solidified to accumulate heat by latent heat. That is, heat accumulation temperature is 0 deg.C. In this case, since the total surface area of styluslike fins 24 is large, heat accumulation is abruptly advanced in high efficiency. Since the tube 22 of the exchanger 20 and the fin 24 are brought into contact with the ends of the agent 16, the agent crystal is desirably grown on the tube 22 and the fin 24 as the heat accumulation to the agent 16 is advanced, and the agent 16 is effectively used. When the heat accumulation approaches completion, the liquid refrigerant in the tube 22 is overcharged, but since an accumulator 26 is provided, it can be coped with.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a heat storage device.

(Prior art) When configuring a heat storage device by disposing a fin-and-tube heat exchanger in which plate-shaped fins are formed on the outer peripheral surface of a tube in a latent heat storage agent, the volume due to the phase transition of the heat storage agent increases. The force of the change could cause the heat exchanger to fall apart.

Therefore, for example, in the heat storage device disclosed in Japanese Patent Publication No. 61-45159, a fin-and-tube heat exchanger is arranged in the latent heat storage agent improvement section for low-temperature heat storage in the heat storage container, and a heater is arranged at the bottom. There is.

In this heat storage device, each time the heat storage agent crystals adhere to the heat exchanger, the heater is energized to separate the crystals from the heat exchanger, and the crystals are sequentially stored in the lower part of the heat storage container.

(Problems to be Solved by the Invention) The conventional heat storage device disclosed in Japanese Patent Publication No. 61-45159 requires a heater for separating heat storage agent crystals, and the control of this heater is troublesome.

Further, a space is required to receive the heat storage agent crystals in the heat storage container, which causes a problem of increasing the size of the device.

In addition, with plate-shaped fins, the surface area of the heat exchanger cannot be made very large, so not only does it take a long time to store heat, but additional heating energy is required, so the ratio of recovered energy to the energy required for heat storage is Heat storage efficiency was not very good.

The present invention has been made in consideration of the above circumstances, and it is an object of the present invention to provide a heat storage device that does not require a heater for removing heat storage agent crystals, is compact, and has improved heat storage speed and heat storage efficiency. purpose.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, a heat storage device according to the present invention includes a heat storage device including a plurality of needle-like fins formed on the outer peripheral surface of a tube.
Two heat exchangers are arranged in parallel in a heat storage agent,
A side heat exchanger is disposed at a position where the fins of one heat exchanger fit between the fins of the other heat exchanger.

(Function) One heat exchanger is for heat storage, and the other heat exchanger is for heat storage and recovery.

When using a low temperature heat storage agent such as water, the low temperature fluid is supplied into the tubes of the heat storage heat exchanger.

At this time, the heat storage agent is cooled and low-temperature heat storage is performed.

The heat exchanger for heat storage has many needle-like fins formed on the outer circumferential surface of the tube, and the contact area with the heat storage agent is very large.
Heat storage progresses rapidly and with high efficiency. Even if heat storage agent crystals grow on the tubes and acicular fins of the heat storage heat exchanger as heat storage progresses in the latent heat storage agent, the heat exchanger will not be destroyed even if these crystals are not removed. do not have. At this time, since the needle-like fins of the heat exchanger for heat storage and recovery are inserted between the needle-like fins of the heat exchanger for heat storage, the grown heat storage agent crystals come into contact with the needle-like fins of the heat exchanger for heat storage and recovery. do.

Therefore, the recovery of thermal energy is also performed with high efficiency.

When using a high temperature heat storage agent such as paraffin, a high temperature fluid is supplied into the tubes of the heat storage heat exchanger. On this occasion,
The heat storage agent is heated and high temperature heat is stored. In this case as well, not only heat storage progresses rapidly and with high efficiency, but also heat storage energy recovery is performed with high efficiency.

The tubes of the side heat exchanger can be arranged in parallel, and these tubes can be arranged crookedly throughout the entire heat storage agent. By bringing the heat exchanger into contact with the heat storage agent, all of the heat storage agent can be utilized.

(Example) FIG. 1 and FIG. 2 are both longitudinal cross-sectional views of a latent heat storage device for heating and cooling according to an example of the present invention, and two
Each figure shows the state cut on a vertical plane.

The upper opening of the heat storage container 10 made of a heat insulating material is closed with a cover plate 12 also made of a heat insulating material, and a ventilation hole 14 is formed on the side of the cover plate 12. The heat storage container 10 is filled with water as a heat storage agent 16 for low-temperature heat storage, and an air layer 18 is formed in the upper part of the container to absorb the volume change accompanying the phase transition of the heat storage agent 1B. .

Two heat exchangers, a heat exchanger 20 for heat storage and a heat exchanger 30 for heat storage and recovery, are immersed in the heat storage agent 16. After the tube 22 of the heat storage heat exchanger 2o enters the heat storage container 1O, the tube 22 runs throughout the heat storage agent 16 while being bent so that the horizontal portion forms, for example, three layers. A large number of needle-like fins 24 are formed radially on the outer peripheral surface of the horizontal portion of the tube 22 . Appropriate dimensions of one needle-like fin 24 are, for example, a length of 9 to 11 m and a width of 0.8 mm, and approximately 3000 fins are formed per tube length l0CIII. The tube 22 exits from the heat storage container 10 via the accumulator 2B. Heat exchanger 30 for heat storage and recovery
After entering the heat storage container 10, the tube 32 runs parallel to the tube 22 of the heat storage heat exchanger 20. The tube 32 has similar needle-like fins 3 on the outer peripheral surface of the horizontal portion.
4 is formed, and this horizontal portion runs through the heat storage agent 16 so as to form, for example, two layers. At this time, both tubes 2
2.32 are arranged in alternating horizontal layers, and their needle-like fins 24.34 are inserted between each other. However, in FIGS. 1 and 2, some of the needle fins 24, 34 are omitted. Tube 3 of heat exchanger 30 for heat storage and recovery
2 exits from the heat storage container IO without passing through the accumulator.

When performing heat storage, for example, a low-temperature, low-pressure fluorocarbon-based liquid refrigerant is supplied to the tubes 22 of the heat exchanger 20 for heat storage. The heat storage agent 1B in contact with the heat storage heat exchanger 20 is cooled and solidified by the low-temperature liquid refrigerant, and latent heat is stored here. In other words, the heat storage temperature is 0°C. At this time, since the total surface area of the needle fins 24 is large, heat storage progresses rapidly and with high efficiency. Since the tubes 22 and acicular fins 24 of the heat storage heat exchanger 20 come into contact with every corner of the heat storage agent 16, heat storage agent crystals are formed on the tubes 22 and acicular fins 24 as heat storage progresses in the heat storage agent 1B. It grows well and the heat storage agent 1B is effectively used. When heat storage approaches completion, the liquid refrigerant in the tube 22 becomes overcharged, but since the accumulator 2B is provided, this can be dealt with. At this time, even if the heat storage agent crystals are not removed from the heat storage heat exchanger 20, this heat exchanger will not be destroyed. Further, although the volume of the heat storage agent 16 increases due to this latent heat storage, since the air layer 18 is provided in the upper part of the heat storage container 10 and the ventilation hole 14 is provided in the upper surface, the heat storage container 10 will not be destroyed.

A pressure regulating valve may be provided in the vent hole 14.

Now, the same heat exchanger 20, 30 needle fins 24.34
are inserted between each other, the grown heat storage agent crystals come into contact with the needle-like fins 34 of the heat storage and recovery heat exchanger 30.

Therefore, the heat storage energy of the heat storage agent 16 is efficiently transmitted to the heat transfer medium in the heat storage and recovery heat exchanger 30, and the heat storage energy is recovered with high efficiency.

At this time, the heat storage agent crystals melt and re-storage of heat becomes possible. The heat exchangers 20 and 30 also respond to volume changes due to phase transition of the heat storage agent 16, that is, repeated solidification and melting.
The needle fins 24, 34 do not come apart.

As the heat storage agent 16, a latent heat storage agent that undergoes a phase transition at the operating temperature as described above is suitable.

If a latent heat storage agent is used, a large amount of thermal energy can be stored per unit volume of the heat storage agent 16, and the heat storage device can be made compact. However, as the heat storage agent te, other than the latent heat storage agent may be used.

3 to 5 show the tube 22 of the heat storage heat exchanger 20.
FIG. 3 is a schematic diagram illustrating an example of a change in the arrangement of the heat exchanger tube 32 of the heat storage and recovery heat exchanger 30, with white circles indicating the heat storage heat exchanger tube 22 and black circles indicating the heat storage and recovery heat exchanger tube 32, respectively. However, in these figures, the needle fin 24
．． The illustration of 34 is omitted.

In the case of FIG. 3, the tubes 22, 82 are arranged in a staggered manner with high density, and one heat exchanger tube 32 for heat storage and recovery is adjacent to four heat exchanger tubes 22 for heat storage. In this case, the heat storage device can be made more compact than the case shown in FIG. 2, and the amount of wrap between the fins can be increased. In addition, as shown in Figures 4 and 5, heat storage 2
2 and 32 for heat storage and recovery may be used. tube 2
2.32 may be connected in series or in parallel. In the above explanation, the tubes 22, 32 are arranged parallel to each other in the horizontal direction, but unlike the conventional case of using a heater for removing heat storage agent crystals, these tubes 22, 32 are arranged parallel to each other in the vertical direction. There is no problem even if it is aligned. Therefore, the degree of freedom in designing the heat exchangers 20 and 30 is high.

For example, if a material such as paraffin or hydrated salts is used as the heat storage agent IB, the device described above can be used as a highly efficient high temperature heat storage device without making any changes to other parts.

[Effects of the Invention] As explained above, the heat storage device according to the present invention has two heat exchangers each having a large number of needle-like fins formed on the outer peripheral surface of a tube arranged in parallel in a heat storage agent. Since the heat exchanger is arranged at a position where the fins of one heat exchanger fit between the fins of the other heat exchanger, according to the present invention, a heater for separating the heat storage agent crystals is not required. It is possible to provide a heat storage device that is compact and has improved heat storage speed and heat storage efficiency.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a heat storage device according to an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the previous heat storage device in another direction, and Fig. 3 is a heat exchanger tube for heat storage and heat storage and recovery heat. A schematic diagram showing an example of a change in the arrangement with the exchanger tube, FIG. 4 is a schematic diagram showing another example of a change in the arrangement of the heat exchanger tube for heat storage and the heat exchanger tube for heat storage and recovery, and FIG. It is a schematic diagram which shows yet another example of a change of arrangement|positioning of the heat exchanger tube for heat storage and recovery, and the heat exchanger tube for heat storage and recovery. Explanation of symbols 10... Heat storage container, 16... Heat storage agent, 20... Heat exchanger for heat storage, 22... Tube, 24... Acicular fin, 3G... Heat exchanger for heat storage and recovery vessel, 32... tube, 34... needle-like fin. Figure 8 Figure 4 Figure 5

Claims (1)

[Claims] 1. A heat storage device in which two heat exchangers each having a large number of needle-shaped fins formed on the outer peripheral surface of a tube are arranged in parallel in a heat storage agent, and the fins of one heat exchanger are connected to the fins of the other heat exchanger. A heat storage device characterized in that both heat exchangers are arranged at positions that fit between fins.