JP2547918B2 - Latent heat storage device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly uses electric power at night to store cold heat by generating a sherbet-like cooling solidified product in a heat storage tank, and melts it in the daytime for use in cooling and air conditioning. The present invention relates to a latent heat storage device.

[0002]

2. Description of the Related Art In recent years, an air conditioning system in an industrial plant, a high-rise building, etc., uses cold electric power at night to generate cold water or hot water using a heat pump (same as a refrigerator, hereinafter referred to as HP). A heat storage type air conditioning system has been proposed which stores heat and uses it mainly for daytime air conditioning to improve economic efficiency. In particular, recently, there is a concern that the cooling load during the summer daytime will rapidly increase and the stable supply of electric power may be hindered.

From such a background, many air-conditioning equipment having a heat storage device have been studied, and the ice heat storage device, which is already in operation and whose heat storage capacity is remarkably increased as compared with conventional water, is steadily put into practical use. Is being promoted.

[0004] For example, in a common example, there is a super ice system (trade name of Takasago Thermal Engineering Co., Ltd.) which adopts a supercooled ice making method for producing and storing ice in a sherbet state inside a water tank. This is the same as the heat storage device (latent heat storage device) of the present invention in that water is used as the latent heat storage medium (first liquid), and in particular, ice in a sherbet state is continuously produced.

However, the conventional sherbet-like ice producing / storing system does not have a means for effectively transferring the produced ice, so that it cannot be applied to a large-scale ice heat storage system or the ice is not stored. The volume occupancy of the ice inside the water tank for storage is not sufficient, and there is a problem that the size of the device is increased.

[0006]

In the direct direct ice making method, which is characterized in that sherbet-shaped ice is produced, the produced sherbet-like ice is stored in the upper part of the water tank by buoyancy. At the top of the stored ice, the volume ratio of the ice is about 30% because it is weakly compressed by the buoyancy of the underlying ice, but at the bottom of the stored ice, there is no compression,
The volume ratio of ice has dropped to around 1%. Therefore,
The conventional ice heat storage device employing the direct touch ice making method has a drawback that the ice storage factor of the heat storage water tank is low.

For the purpose of improving this drawback, there is a technique for pumping ice in a sherbet state stored in the upper part of the ice making tank by a transfer means such as a water wheel and transferring it to the ice storing tank, but a complicated mechanism is required. There was a problem in maintenance and inspection for long-term use.

The present invention has been made in view of the above-mentioned circumstances, and has been made for the purpose of storing sherbet-like cooled solidified materials in a storage tank for the cooled solidified materials with an efficient and simple mechanism. is there.

[0009]

DISCLOSURE OF THE INVENTION The present invention relates to an ice heat storage water tank for storing cold water and a non-water-soluble and heavy antifreeze liquid (heat storage refrigerant liquid) together with water in a space such as a basement or a roof of a building (particularly, A water tank that stores ice is called an ice tank, and a water tank that manufactures ice is called an ice-making tank), and a cold water supply system that forcibly circulates the cold water in this ice tank to the building and each room inside the building. In the air conditioner equipped with a heat storage refrigerant liquid circulation system that takes out the heat storage refrigerant liquid from the lower portion of the ice making tank, cools it in a separately placed refrigerator, and returns it again into the ice making tank,
The sherbet-like ice is produced in the ice making tank with high efficiency by using cheap electricity at night, and it is regularly transferred to the ice storage tank to store the sherbet-like ice at high density, and during the daytime, the ice storage is carried out. Take out cold water or cold water mixed with ice in a sherbet state from the tank and either directly at low temperature or cool each room in the building to mix with the refluxed water that has become hot to make it an appropriate temperature, then send the cold water to the cooling load .

On the other hand, a part or all of the high-temperature reflux water is sprayed on the sherbet-like ice from the upper part of the ice storage tank in the form of a shower or the like. Since the sherbet-like ice floats inside the ice storage tank and is thawed to the upper part while being thawed, high-speed thawing is possible.

In the ice heat storage device (latent heat storage device) having such excellent characteristics, the sherbet-shaped ice produced in the ice making tank is manufactured in the ice making tank as a means for transferring the sherbet-like ice to the upper portion. When transferring sherbet-like ice with a high ice filling rate that is floating in the water, it is effective to open the sluice gate and transfer it to an ice storage tank like an avalanche.

[0012]

[Function] The sherbet-like ice produced in the ice-making tank is in a predetermined amount, and water is taken from the ice-storage tank so that the time when the ice-water is floated at the desired volume occupation ratio of the ice in the upper portion of the ice-making tank. The water is pumped to the ice making tank, and the ice making tank is connected to the ice making tank at a place where the water level of the ice making tank is raised by a predetermined height compared to the ice storage tank water level (the sensor that detects the water level grasps the information). Since the sluices installed at the open type connection part are configured to be released all at once, sherbet-like ice floating in the upper part of the ice making tank moves to the ice storage part like an avalanche.

By opening and closing the sluice in this way, it is possible to repeat ice making (storage) and transfer, and to store sherbet-like ice in high density in the ice storage tank. On the other hand, since the ice making process inside the ice making tank can be always carried out at a low volume filling rate of ice, it becomes possible to keep the ice making conditions good.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

As shown in the figure, the heat storage refrigerant liquid (for example, Fluorinert) Wa which is the second liquid is pumped up mainly by using cheap electric power at night to drive the pump 1 and send it to the refrigerator 2. After cooling to a temperature lower than the freezing point (0 ° C.) of water which is the first liquid, the pipes 4 and a plurality of nozzles 5 installed at the tip thereof are provided in the plurality of ice making tanks 3 at the same time or with a time shift. The cold heat stored in the heat storage refrigerant liquid Wa is caused to flow into the water W in the ice making tank 3 and the water W is given the cold heat.

Each nozzle 5 has a height (first height) necessary for sufficiently exchanging heat with the water W after the heat storage refrigerant liquid Wa is ejected.
0.5m or more (from the interface between the liquid and the second liquid) is secured. Therefore, the heat storage refrigerant liquid Wa rises in temperature to almost the water temperature (0 ° C. in the ice making state) by the time it reaches the storage portion 7 installed in the bottom portion 6 of the ice making tank 3, and the heat exchange efficiency by the heat storage refrigerant liquid Wa is almost the same. It will be 100%.

Inside the ice making tank 3, the generated sherbet-like ice 8 is stored in the upper portion 9 like a cloud, and the volume occupancy rate of the ice is higher as it is closer to the water surface. In this way, while the ice making is continued, the heat storage refrigerant liquid Wa is continuously supplied to the ice making tank 3 through the pipe 13 and the pump 14 together with the cold water W from the storage portion 12 of the heat storage refrigerant liquid Wa installed in the lower portion of the ice storage tank 10. Has been done. As a result, the water level in the ice making tank 3 gradually rises. Naturally, the water level of the ice storage tank 10 decreases, but the movement of the ice storage tank 10 is small because the volume of the ice storage tank 10 is several times or more the volume of the ice making tank 3.

When the water level in the ice making tank 3 rises, when the water level sensor 15 installed at a predetermined position detects that a predetermined amount has been reached, the connecting portion 16 for connecting the ice making tank 3 and the ice storage tank 10 is detected. The sluice board 18 of the installed sluice gate 17 moves downwards and the ice maker 3
The ice 8 in the sherbet state on the upper part 9 of the above is transferred to the ice storage tank 10 via the connecting portion 16 as a whole flow (the sherbet-like ice moves at once like an avalanche). The connecting portion 16 is constructed so as to always have a downward slope from the ice making tank 3 to the ice storage tank 10 so that ice does not stagnate on the way.

The water gate plate 18 of the water gate portion 17 gradually rises, and again, when the time when the water flows to the bottom of the water gate portion 17 is estimated.
Accumulation of water W begins. During this period, ice making is continuously continued.

As described above, in the embodiment, when the ice in the sherbet state is transferred, the sluice gate is released according to the storage state of the ice in the storage state and the sherbet state, whereby the volume filling rate of the ice as avalanche-like mass is suddenly increased. Since it is configured to transfer it to the ice storage tank in a high state, basically the power for transfer is only the pump power required to transfer the water sent from the ice storage tank to the ice making tank. Since only the movement mechanism is adopted and the movement of the ice in the sherbet state due to gravity is generated, the ice can be transferred without requiring a complicated transfer means. Furthermore, if the shape of the sluice is set to be as long as possible in the horizontal direction, it is possible to effectively prevent the ice from breaking and the water selectively flowing.

[0021]

As described above, in the present invention, since sherbet-like ice can be regularly transferred from the ice making tank to the ice storage tank, the ice making conditions in the ice making tank are always kept at the best condition, and The effect is that sherbet-shaped ice, which has a high volume ratio of ice stored in the upper portion of the ice making tank, can be selectively transferred to the ice storage tank. Furthermore, since the sluice board is opened downward, it is possible to prevent only the water from flowing out at the beginning, and it is possible to move the sherbet-shaped ice like an avalanche at a stretch.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an ice heat storage device including an ice transfer device according to the present invention.

FIG. 2 is a sectional configuration diagram of FIG.

[Explanation of symbols]

 1 ... Circulation pump for heat storage refrigerant liquid Wa ... Cooling means for heat storage refrigerant liquid Wa such as refrigerator 3 ... Ice making tank 4 ... Circulation system piping for heat storage refrigerant liquid Wa 5 ... Outflow nozzle of heat storage refrigerant liquid Wa into water W 6 ... Bottom of ice-making tank 7 ... Storage portion of heat storage refrigerant liquid Wa 8 ... Sherbet-like ice 9 ... Ice making tank upper portion 10 ... Ice storage tank 11 ... Ice storage tank bottom portion 12 ... Heat storage refrigerant liquid Wa storage portion / water intake portion 13 ... Water transfer Piping 14 ... Water transfer pump 15 ... Water level sensor 16 ... Connection part 17 ... Flood gate part 18 ... Flood gate plate (valve plate)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-5-223291 (JP, A) JP-A-4-251139 (JP, A) JP-A-1-155135 (JP, A)

Claims (3)

(57) [Claims] 1. A heat storage device that uses latent heat at the time of solidification of a liquid as a heat storage medium for air conditioning, wherein the first liquid in the heat storage tank has a lower freezing point than the first liquid and is mixed and combined with each other. And a water-soluble second liquid, which is provided with an outflow means for ejecting after cooling the second liquid below the freezing point of the first liquid by a separately placed freezing means, by directly touching a part of the first liquid by heat exchange. In a latent heat storage device having means for cooling and solidifying and storing heat by removing the latent heat thereof, and means for separating and recovering the second liquid that has flowed out, a solidified product manufacturing section and a manufacture for exclusively producing a cooled solidified product of the first liquid First done
The tank is separated into a storage section for storing the cooled and solidified liquid of the liquid, and an opening / closing mechanism for controlling the flow of the liquid is installed at the open type upper connection section connecting the both tanks.
Installed a liquid transfer system that takes out the liquid of
Cooling solidification is performed while gradually increasing the liquid level in the coagulum production tank, detecting that the liquid level in the cooling coagulation product tank exceeds the storage tank liquid level by a predetermined amount, releasing the opening / closing mechanism, and immediately A latent heat storage device comprising means for causing the first liquid stored in the upper part of the solidified product manufacturing tank and its cooled solidified product to flow down to the storage tank. 2. The first liquid from the cooling solidified product production tank is set at the lowest position of the first liquid from the cooling solidified product storage tank.
2. The latent heat storage device according to claim 1, wherein the liquid and the second liquid mixed during the transfer of the cooled solidified product at regular intervals are collected and recovered. 3. The cooling solidified product manufacturing tank and the storage tank are provided with one or more recesses on the bottom surface, and the bottom surface is slightly inclined so that the second liquid is collected and stored in the recess. The latent heat storage device according to claim 1, further comprising recovery means for recovering the stored second liquid.