JPH0635893B2 - Heat storage method and heat storage device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat storage method and a heat storage device, and more particularly to a technique for improving heat storage efficiency of a heat storage device in which a plurality of heat storage tanks are connected in series.

<< Conventional Technology >> The heat storage device stores cold water during cooling in summer,
Hot water is stored during heating in winter, and if necessary, these cold and hot water is supplied to the air conditioner and fan coil connected to the secondary side to be used for cooling and heating, making effective use of surplus electricity. Known as a means.

As a kind of heat storage device of this kind, a communication passage type heat storage device in which a plurality of heat storage tanks are connected in series by a communication passage is provided, and the heat storage device of this type is installed in, for example, an underfloor space of a building structure. ing.

FIG. 3 shows a typical example of a communication passage type heat storage device that has been conventionally used.

The heat storage device shown in the figure has an outer wall 1 made of a heat insulating member,
It has seven heat storage tanks which are divided by providing a plurality of partition walls 2 and which are composed of a starting end tank C1, intermediate tanks C2 to C6, and an end tank C7.

The partition walls 2 have communication passages 11 to 16 respectively penetrating the partition walls 2.
Are formed, and the communication passages 11 to 16 are arranged in a zigzag pattern, and the start end tank C1 to the end tank C7 are connected in series to form a heat storage tank row.

A heat source device G is installed between the start end tank C1 and the end tank C7, and the heat source device G and the start end tank C1 supply the heat storage medium to the supply path 3
A sensor T which is connected to the heat source device G and detects the temperature of the heat storage medium M sent from the heat source device G and stops the heat source device G when the temperature reaches a set value.

Although not shown, the starting end tank C1 and the ending tank C7
And a load such as an air conditioner for extracting heat are installed in parallel with the heat source device G.

On the downstream side of the heat source device G, a return passage 4 communicating with the terminal tank C7 is connected, and in the middle of this return passage 4,
The mixing bubble MV and the circulation pump P1 are interposed.

A second return passage 5 communicating with the starting end tank C1 is connected to the mixing bubble MV, and the mixing bubble MV mixes the heat storage medium M flowing in from the return passages 4 and 5 and a heat source device via the circulation pump P1. Send to G.

In the heat storage device having such a structure, water is usually used as the heat storage medium M, but the heat storage method has a technical problem described below.

<< Problems to be Solved by the Invention >> That is, assuming that the heat storage device shown in FIG. 3 stores cold water for cooling in the summer, at the beginning of heat storage, low-temperature cold water is supplied from the heat source device G to the start tank. The cold water sent to C1 and overflowing from the starting end tank C1 passes through the communication passage 11 to the intermediate tank C.
2, C3, ... are sequentially sent in and heat accumulation progresses.

In this heat storage process, since the communication paths 11 to 16 are arranged in a staggered manner in the heat storage device shown in FIG.
In 2, C4 and C6, cold water flows in from the upper part and flows out from the lower part, and in intermediate tanks C3 and C5, conversely, it flows in from the lower part and flows out from the upper part.

At this time, each of the intermediate tanks C2 to C6 is filled with return water (usually 12 to 14 ° C.) from a load such as an air conditioner,
Cold water, which has a larger specific gravity than return water, flows into it.

When heat storage proceeds under such conditions, the intermediate tanks C3, C5
In this case, since heat is stored by pushing up the high-temperature return water, it is filled with cold water except in the vicinity of the water surface, and only a very small dead water region D3, D5 is generated in the vicinity of the water surface, but the intermediate tanks C2, C4. At C6, since the cold water flowing in from the upper part has a larger specific gravity than the return water, it will sneak under the return water and flow out from the lower part. As shown in FIG. 3 (B), the heat storage is completed. The intermediate tanks C2, C
Large dead water areas D2 and D on the upper side of 4 and C6, respectively.
4, D6 occurs.

On the other hand, during heating in winter, as shown in FIG.
Since warm water whose specific gravity is smaller than that of the return water is sent from the starting end tank C1, the above situation is reversed, and large dead water regions D3 and D5 are generated on the lower side of the intermediate tanks C3 and C5. Dead water regions D2, D4, D6, D3 and D5 generated in both cooling and heating have been a cause of greatly reducing the heat storage efficiency of this type of heat storage device.

For such a problem, for example, the intermediate tanks C1 to C6
Although it is possible to install a stirrer in the above, in this solution, since the tank that needs stirring differs depending on the time of cooling or heating, the control is required, the structure becomes complicated, and the noise also increases.

The present invention has been made in view of such conventional problems, and an object thereof is to provide a heat storage method and a heat storage device capable of significantly improving heat storage efficiency without inviting a complicated structure.

<< Means for Solving the Problem >> In order to achieve the above object, the present invention is a heat storage method of a heat storage device having a heat storage tank row in which a plurality of heat storage tanks are connected in series by a communication path arranged in a staggered manner, After the heat is sequentially stored from one end side to the other end side of the heat storage tank, heat is sequentially stored again from the other end side of the heat storage tank row.

Further, a plurality of heat storage tanks, a plurality of communication passages that are arranged in a staggered manner between these heat storage tanks and that form a heat storage tank row by connecting the heat storage tanks in series, and one end side and the other end of the heat storage tank row. In a heat storage device having a heat source device installed between the heat storage device and the heat storage device, when heat storage progresses from one end side of the heat storage tank array and reaches the other end side, the heat storage medium from the heat source device is transferred to the heat storage tank array. Is characterized by having a branch supply path introduced to the other end side of the.

<< Operation >> According to the heat storage method and the heat storage device having the above-described configuration, after the heat is sequentially stored from the one end side to the other end side of the heat storage tank row, the heat is sequentially stored again from the other end side of the heat storage tank row to the one end side. A heat storage tank where cold water sometimes supplied from the upper side flows out from the lower side,
And, in the heat storage tank in which hot water supplied from the lower side during hot water heat storage flows out from the upper side, since the communication passages are arranged in a staggered manner, when heat is stored from the other end toward the one end, Cold water is supplied from the lower side and flows out from the upper side, and hot water is supplied from the lower side and flows out from the upper side.

Therefore, when heat is stored from one end side to the other end side of the heat storage tank row, the dead water regions respectively generated in the heat storage tank under the above conditions are pushed up during cold water heat storage and pushed down during hot water heat storage, thereby completing heat storage. The dead water area can be greatly reduced at that time.

<Example> Hereinafter, a preferred example of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 show an embodiment of a heat storage method and a heat storage device according to the present invention.

In the heat storage device shown in the figure, the same reference numerals are used for the same or corresponding portions as those of the conventional heat storage device described above.

First, the heat storage device according to the present invention will be described. In the outer wall 1 made of a heat insulating member, seven heat storage tanks including a starting end tank C1, intermediate tanks C2 to C6, and an end tank C7 partitioned by a plurality of partition walls 2 are provided. Each partition wall 2 has a communication passage 11
To 16 are formed, and the communication passages 11 to 16 are arranged in a staggered manner in the vertical and horizontal directions, and the starting end tank C1 to the ending tank C7 are connected in series to form a heat storage tank row C.

In addition, the heat source device G is provided between the start end tank C1 and the end tank C7.
Is installed, and the heat source device G and the starting end tank C1 are communicated with each other through a supply path 3 for supplying a heat storage medium.
A sensor T is installed to detect the temperature of the heat storage medium M sent from the device and control the heat source device G based on the detected value.

On the downstream side of the heat source device G, a return passage 4 communicating with the terminal tank C7 is connected, and in the middle of this return passage 4,
The mixing valve MV and the circulation pump P1 are interposed,
A second return passage 5 communicating with the starting end tank C1 is connected to the mixing valve MV, and the mixing valve MV mixes the heat storage medium M flowing in from the return passages 4 and 5 to generate a heat source via the circulation pump P1. Send to device G.

Further, water is also used as the heat storage medium M in the heat storage device of the present invention, and the basic configuration of the heat storage device is the same as that of the conventional device described above, but the heat storage device shown in FIG. It is characterized in that it is explained in.

That is, a branch supply path 10 is provided in the middle of the supply path 3, the branch supply path 10 is connected to the terminal tank C7, and heat is sequentially stored from one end side to the other end side of the heat storage tank row C in this direction. In order to supply the heat storage medium M to the other end side of the heat storage tank array C when the heat storage in (1) is completed, the supply passage 3 and the branch supply passage 10 are provided with open / close valves V1 and V2, respectively.

Next, a method of storing heat in the heat storage device configured as described above will be described.

FIG. 1 shows a case where cold water is stored in the heat storage tank row C.

In the method shown in the figure, in consideration of the relationship between the heat storage tank row C and the load connected in parallel with the heat source device G, first, in the figure (A),
In the first stage shown in (B), the on-off valve V2 is opened to supply cold water from the branch supply passage 10 to the terminal tank C7.

The temperature of the cold water in this case varies depending on the type of the heat source device G and the like. For example, in a heat pump type refrigerator, the energy potential is set to be lower than the second-stage cold water temperature described later, Specifically, if the cold water temperature in the second stage is 7 ° C, it is set to about 9 ° C, which is higher than this.

The cold water supplied to the terminal tank C7 is connected to the communication passages l1 to l.
When the intermediate-stage tanks C6 and C2 and the starting-end tank C1 are sequentially supplied via 6 and the heat storage of the first stage is completed, as shown in FIG. As described above, the large dead water regions D3 and D5 are generated due to the specific gravity relationship between the cold water and the return water and the arrangement of the communication passage l.

Therefore, in the heat storage method shown in this embodiment, as the second step, as shown in FIG. 1 (C), the on-off valve V2 is closed and the on-off valve V1 is opened to supply cold water from the supply passage 3 to the starting end tank C1. I was supposed to supply it.

When such second stage heat storage is performed, the intermediate tanks C2, C
In C4 and C6, cold water is supplied from the upper side and flows out from the lower side.
In C6, since the cold water has already been filled in the portion excluding the vicinity of the water surface in the above-described first stage, the dead water region due to the difference in specific gravity does not occur.

On the other hand, in the intermediate tanks C3 and C5, contrary to the first stage, cold water is supplied from the lower side and flows out from the upper side,
Therefore, the dead water regions D3 and D5 that were generated in the first stage
Will be pushed up.

As a result, when the heat storage in the second stage is completed, each intermediate tank C
In 1 to C6, there is a slight dead water area D1 only near the water surface.
~ D6 remains.

FIG. 2 shows a heat storage method using hot water. At the first stage shown in FIGS. (A) and (B), the opening / closing valve V2 is opened in the same manner as the cold water described above, and the hot water is used as the end tank. Supplied to C7.

If the heat storage device is of a heat pump type, the condition of the hot water here is selected to be smaller than the energy potential of the second stage as in the case of cold water. For example, if the second stage is 46 ° C., In one stage, it is set to about 40 ° C.

Then, the accumulated heat of hot water is transferred from the terminal tank C7 to the intermediate tanks C6 to C.
2 and the starting end tank C1, and when the first stage heat storage is completed, as shown in FIG. 2 (B), the intermediate tanks C2, C4,
Large dead water regions D2, D4, and D6 are generated in C6, respectively.

In the subsequent second stage shown in FIG. 2 (C), the on-off valve V2 is closed, the on-off valve V1 is opened, hot water is supplied to the starting end tank C1 this time, and heat is stored from the starting end tank C1 to the end tank C7. Done.

When the heat storage in the second stage is performed in this way, the dead water regions D2, D generated in the intermediate tanks C2, C4, C6 in the first stage
In the second stage, warm water is supplied from the upper side and the D4 and D6 are pushed down because they flow out from the lower side.

As a result, in the state where the heat storage in the second stage is completed, in each of the intermediate tanks C1 to C6, a slight dead water region D1 to D6 is generated in a part of the lower part thereof.

By the way, when the heat is stored by the above method, the dead water region becomes small, and the heat storage state in each of the intermediate tanks C1 to C6 is made uniform, and the heat storage efficiency is high, regardless of whether the cold water or the hot water is stored. Is also greatly improved.

Further, in order to obtain such an effect, the branch supply path 10 may be added to the conventional heat storage device, and the supply path 3 and the branch supply path 10 may be provided with the on-off valves V1 and V2, respectively.
The heat storage efficiency can be improved by simply modifying the existing heat storage device.

In the above embodiment, the case where heat is stored from the terminal tank C7 side is illustrated in the first stage in consideration of the load connection state.
The embodiment of the present invention is not limited to this, and heat may be stored from the starting end tank C1 side in the first stage.

<< Effects of the Invention >> As described in detail in the above embodiments, in the heat storage method and the heat storage device according to the present invention, after the heat is stored from one end side of the heat storage tank row, the heat is again stored from the other end side, so that the heat medium The dead water region of the heat storage tank, which is generated due to the difference in specific gravity and the arrangement of the communication passages, can be significantly reduced to improve heat storage efficiency, and the heat storage state of each heat storage tank can be made uniform.

Further, the heat storage device capable of obtaining such an effect is obtained by a simple configuration of installing a branch passage and an opening / closing valve,
It can also be easily attached to existing heat storage devices.

[Brief description of drawings]

1 and 2 show an embodiment of a heat storage device and a heat storage method according to the present invention. FIG. 1 is an explanatory diagram for storing cold water, and FIG. 2 is an explanatory diagram for storing hot water. , Third
The figure is an explanatory view of a conventional heat storage device and a heat storage method thereof. C ... Heat storage tank row C1 ... Start end tank C2-C6 ... Intermediate tank C7 ... End tank l1 to l6 ... Communication passage M ... Heat storage medium V1, V2 ... Open / close valve 10 ... Branch passage

Claims (2)

[Claims] 1. A heat storage method of a heat storage device having a heat storage tank row in which a plurality of heat storage tanks are connected in series by staggered communication passages, after the heat is sequentially stored from one end side to the other end side of the heat storage tank row. A heat storage method characterized in that heat is sequentially stored again from the other end side of the heat storage tank row. 2. A plurality of heat storage tanks, a plurality of communication passages that are arranged in a staggered manner between these heat storage tanks, and that connect the heat storage tanks in series to form a heat storage tank row, and one end side of the heat storage tank row. In a heat storage device comprising a heat source device installed between the heat source device and the other end side, when heat storage proceeds from one end side of the heat storage tank row and reaches the other end side, the heat storage medium from the heat source device is A heat storage device having a branch supply path introduced to the other end side of the heat storage tank array.