JPH05322239A - Ice heat storage device - Google Patents

Abstract

PURPOSE:To provide an ice heat storage device capable of effectually utilizing latent heat of ice by effectually melting ice in a heat storage reservoir and taking out cold water. CONSTITUTION:Water in a heat storage tank 22 is made into ice by a brine which returns from an outlet 26 of a heat exchanger coil 24 provided to be buried in water with which the heat storage tank 22 is filled through a brine pump 28 and cooling means 30 to an inlet 40 of the heat exchanger coil 24. Then, ice 84 made in the heat storage tank 22 is melted as a cold heat source of an air conditioner with the aid of the melted ice water returning from a melted ice water intake port 50 provided in the vicinity of a water bottom inn the heat storage tank 22 through a melted ice water pump 54, and the air conditioner 56 and from a plurality of water sprinkling pipes 68, 70, 72 including valve mechanisms 74, 76, 78 provided on the upper of the heat storage tank 22. Thereupon, the valve mechanisms 74, 76, 78 are opened and closed on the basis of a detection result by one or more detection sensors for detecting the existence and position of the ice in the heat storage tank 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice heat storage device,
In particular, the present invention relates to an ice heat storage device that uses the defrosted water of ice making as a cold heat source for air conditioning.

[0002]

2. Description of the Related Art Electric power demand has a considerable difference between daytime and nighttime, and in recent years, the difference tends to increase. For this reason, leveling the electric power load is an urgent issue, and therefore electric power companies are promoting the effective use of night electric power by lowering the night electric power charge. Against this background, an ice heat storage device, which uses the defrosted water of ice made at night as a cold heat source for air conditioning in the daytime, is in the spotlight. At present, various types of ice heat storage devices have been studied, but as an ice making method, a static type ice-on-coil system as shown in FIG. 6 is generally adopted.

A conventional ice heat storage device 1 of this type will be described with reference to FIG. 6. The ice making operation is performed at night when the electricity charge is low,
The brine discharged from the outlet 4 of the ice-making heat exchange coil 3 provided so as to be submerged in the water filled in the heat storage tank 2 is sent to the heat source device 6 by the brine pump 5 through the pipe 7A to be cooled. The brine cooled by the heat source device 6 is sent to the inlet 9 of the ice making heat exchange coil 3 through the pipe 7B via the first two-way valve 8A, and passes through the ice making heat exchange coil 3 to make the ice making. The heat exchange coil 3 is cooled and returned to the outlet 4 of the ice making heat exchange coil 3. At this time, the first two-way valve 8A
Is fully opened, and a second two-way valve 8B described later is fully closed. By circulating this brine, the water around the ice making heat exchange coil 3 is cooled, and the water in the heat storage tank 2 is gradually made.

[0004] The deicing operation is performed in association with the operation of the air conditioner 11 during the day, and the deicing water that has defrosted the ice 12 in the heat storage tank 2 is taken from the deicing water intake 14 by the deicing water pump 13. The air is sent to the air conditioner 11 via the three-way valve 10 through a pipe 15, and the air conditioner 11 exchanges heat with air (not shown) to cool the air. On the other hand, the thawed water which has been heated by exchanging heat with the conditioned air is sent to the sprinkler pipe 17 installed above the water surface of the heat storage tank 2 through the pipe 18 via the brine-water heat exchanger 16. The deicing water sent to the water sprinkling pipe 17 is sprinkled from the water sprinkling pipe 17 into the heat storage tank 2 to thaw the ice 12 in the heat storage tank 2, and then is again taken from the thaw water intake port 14. Further, the pipe 18 is branched before the sprinkling pipe 17, and a part of the deicing water is returned to the three-way valve 10 without being returned to the heat storage tank 2 and mixed with the deicing water taken from the defrosting water intake 14. .. At this time, depending on the opening degree of the three-way valve 10, the sprinkler pipe 17
The amount of deicing water that returns to and the amount of deicing water that returns to the three-way valve 10 are controlled, and the deicing water at a predetermined temperature can be supplied to the air conditioner 11.

By this deicing water circulation, the air conditioner 11 during the day
During operation, the cold source for air conditioning can be supplied to the air conditioner 11 without operating the heat source device 6. However, when the predetermined temperature is not maintained only by the circulation of the deicing water that thaws the ice 12 in the heat storage tank 2, the first two-way valve 8A is fully closed,
The second two-way valve 8B is fully opened to form piping paths 7A, 7B, 19 through which brine circulates between the heat source device 6 and the brine-water heat exchanger 16. Then, the brine is circulated between the heat source device 6 and the brine-water heat exchanger 16 to supplementally cool the defrosting water.

[0006]

However, in the conventional ice heat storage device, the water spray pipe 17 is provided above the water surface of the heat storage tank 2 on the side opposite to the defrosted water intake 14. Therefore,
The deicing water sprinkled from the sprinkling pipe 17 has a tendency to form a certain path that flows toward the deicing water intake 14 after hitting the ice in the vicinity of just below the sprinkling pipe 17. That is, since the thawed water flows toward the thawed water intake port 14 while thawing the ice in the portion having a low water flow resistance, the contact between the thawed ice and the thawed water is limited, and the thawed portion in the heat storage tank is easily thawed. And a part that is difficult to dissolve occurs. As a result, the efficiency of deicing becomes poor,
Despite having sufficient ice in the heat storage tank 2, the defrosting water intake 1
The defrosting water temperature of No. 4 exceeds 7 to 8 ° C and tends to be inappropriate as a cold heat source of the air conditioner 11. In such a situation, the temperature of the conditioned air of the air conditioner 11 cannot be maintained at a predetermined temperature only with the deicing water from the heat storage tank 2. Therefore, the heat storage tank 2
However, the heat source device 6 has to be operated despite the fact that ice remains, and there is a drawback in that the advantages of nighttime heat storage, which has a low power charge, cannot be fully utilized.

When water is taken from the deicing water intake port 14,
A temperature distribution occurs in the heat storage tank 2 due to the density difference of the defrosting water,
There is a drawback that low temperature cold water cannot be taken out efficiently. The present invention has been made in view of such circumstances, and since ice in the heat storage tank can be efficiently thawed and cold water can be taken out, an ice heat storage device that can effectively use latent heat of ice is provided. The purpose is to provide.

[0008]

In order to achieve the above object, the present invention uses a brine pump and a cooling means from a heat exchange coil outlet provided so as to be submerged in water filled in a heat storage tank. Then, an ice-making device for making water in the heat storage tank by brine circulation returning to the heat exchange coil inlet, and an ice-melting water pump and an air conditioner from the ice-melting water inlet provided near the water bottom in the heat storage tank Then, from an ice-melting device that uses the ice-melting water of ice made in the heat-storage tank as a cold heat source of the air conditioner by circulating the ice-melting water from the sprinkler pipe provided above the heat-storage tank to the heat-storage tank. In the ice heat storage device, a plurality of the water spray pipes are arranged above the water surface of the heat storage tank, each of the water spray pipes is provided with a valve mechanism, and the presence / absence position of the ice is provided at a predetermined position in the heat storage tank. One or more detection sensors for detecting Wherein the opening and closing the respective valve mechanism based on the sensor detection results

[0009]

According to the first aspect of the invention, based on the detection result of one or more detection sensors provided at a predetermined position in the heat storage tank,
When there is ice in the entire heat storage tank, all valve mechanisms can be opened and water can be sprayed from all water spray pipes. Further, when the ice made in the heat storage tank is thawed and there are positions with and without ice in the heat storage tank, the ice among the plurality of sprinkler pipes is detected based on the detection result of the detection sensor. The valve mechanism is closed at the position where there is no ice, and water can be sprayed only from the water spray pipe at the position where there is ice. As a result, the deicing water sprinkled from the sprinkler pipe is always in direct contact with the ice, so that the ice defrosting efficiency can be improved and the latent heat of the ice can be effectively taken out until the ice is almost completely consumed. ..

According to the second aspect of the invention, the sprinkler pipe is moved to a position where ice is present in the heat storage tank based on the detection result of one or more detection sensors provided at a predetermined position in the heat storage tank. Since the water can be sprinkled and sprinkled, the same effect as described above can be obtained. According to the third aspect of the invention, the thawed water is generated according to the temperature distribution in the vertical direction of the thawed water generated in the heat storage tank based on the detection result of the detection sensor provided along the moving direction of the thawed water intake. Since water can be taken by moving the intake port, water can be taken from the layer of the defrosting water having the lowest temperature, and low-temperature cold water can be taken out efficiently.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the ice heat storage device 20 according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows a first embodiment of an ice heat storage device 20 according to the present invention. First, the brine circulation system will be described. The ice heat storage device 22 is immersed in the water filled in the heat storage tank 22. An exchange coil 24 is installed. A pipe 32 is connected from the outlet 26 of the ice-making heat exchange coil 24 to the inlet of the heat source device 30 via the brine pump 28. The pipe 34 from the heat source device 30 outlet is branched into two, one pipe 36 is connected to the ice-making heat exchange coil inlet 40 via a first two-way valve 38, and the other pipe 42 is connected. Second
Is connected to the inlet of the brine-water heat exchanger 46 via the two-way valve 44. Also, the brine-water heat exchanger 4
6 is connected from the outlet of 6 to the inlet of the brine pump 28 by a pipe 48, and by operating the first two-way valve 38 and the second two-way valve 44, the brine that has left the heat source device 30 is cooled by the ice-making heat. Either the exchange coil 24 or the brine-water heat exchanger 46 is circulated.

Next, a description will be given of the deicing water circulation system. A deicing water inlet 50 is provided near the water bottom of the heat storage tank 22, and the air-conditioning is performed from the deicing water inlet 50 via a three-way valve 52 and a deicing water pump 54. A pipe 58 is connected to the machine 56. Further, a pipe 60 is connected from the air conditioner 56 to the brine-water heat exchanger 46, a pipe from the outlet of the brine-water heat exchanger 46 is branched into two, and one pipe 64 is a heat storage tank 22.
A first sprinkler pipe 68, which is disposed above the water surface 66,
Of the third two-way valve 7 to the sprinkler pipe 70 and the third sprinkler pipe 72, respectively.
4, a fourth two-way valve 76 and a fifth two-way valve 78 are connected. The other branched pipe 62 is connected to the three-way valve 52. As a result, the opening amount of the three-way valve 52 controls the amount of deicing water returning to the sprinkler pipes 68, 70, 72 and the amount of deicing water returning to the three-way valve 52, and the air conditioner 56 is operated at a predetermined temperature. Ice water can be supplied. If the predetermined temperature is not maintained only by the circulation of the deicing water for defrosting the ice in the heat storage tank 22, the first two-way valve 38 is fully closed and the second two-way valve 44 is fully opened. , Pipe paths 32, 3 through which brine circulates between the heat source device 30 and the brine-water heat exchanger 46.
4, 42, 48 are formed. Then, the heat source device 30
And the brine-water heat exchanger 46, brine is circulated to subcool the deicing water.

Further, three temperature sensors 79, 80, 82 are installed at predetermined locations in the heat storage tank 22, and the temperature of the temperature sensors 79, 80, 82 is measured to measure the temperature inside the heat storage tank 22. It is possible to detect the presence / absence of ice. The ice-making operation of the ice heat storage device 20 configured as described above is completely the same as the conventional one, and therefore the description thereof will be omitted. The deicing operation is performed in association with the operation of the air conditioner 56 during the daytime, and the deicing water that has defrosted the ice 84 in the heat storage tank 22 is the deicing water pump 5
4, the water is taken from the deicing water intake 50 and sent to the air conditioner 56 via the three-way valve 52, and the air conditioner 56 exchanges heat with the air-conditioning air (not shown) to cool the air-conditioning air. On the other hand, the deicing water that has been heated by exchanging heat with the conditioned air is
The brine-water heat exchanger 4 is passed through the water heat exchanger 46.
A part of the deicing water is divided by the branch pipe at the outlet of 6 and returns to the three-way valve 52 without returning to the heat storage tank 22 and the deicing water intake 50
It is mixed with the deicing water taken from. Most of the other deicing water is sent to three water sprinkling pipes 68, 70, 72 arranged on the entire upper surface of the water surface of the heat storage tank 22.

Then, as shown in FIG. 2, at the start of thawing, the temperatures measured by the temperature sensors 79, 80 and 82 are all ice temperatures, and it is detected that there is ice 84 in the entire heat storage tank. Based on the detection result, the third, fourth,
All of the fifth two-way valves 74, 76, 78 are fully opened, and the above-mentioned 3
Water is sprayed from individual water sprinklers 68, 70, 72. As a result, the ice 84 produced in the heat storage tank 22 can be thawed from a plurality of positions, so that the contact area between the thawed water 86 and the ice 84 becomes large, and a large amount of cold heat can be taken out.

Further, when the ice-melting operation progresses and the ice-melting of the ice 84 progresses, and the ice 84 on the ice-melting water intake 50 side is first melted as shown in FIG. Tank 2
Two temperature sensors 79, 8 provided at predetermined positions in 2
Of the 0 and 82, it is detected that the third temperature sensor 82 installed near the defrosting water intake rises in temperature and ice has run out. Based on this detection result, the fifth three-way valve 78
Is closed, and water spray from the third water spray pipe 72 is stopped. Similarly, the presence or absence of ice 84 is detected by the temperature measured by the three temperature sensors 79, 80, 82 installed at predetermined positions in the heat storage tank 22, and the three sprinkler pipes 68, 70, 7 are detected.
The opening and closing of the respective two-way valves 74, 76 and 78 of 2 are operated.

As a result, when the heat storage tank 22 has a position with the ice 84 and a position without the ice 84, the three water spray pipes 6 are provided.
Water can be sprinkled from a sprinkler pipe at a position of ice 84 among 8, 70, and 72. Therefore, the sprinkling dewatering water 86 can always come into direct contact with the ice 84, so that the deicing efficiency can be improved and the latent heat of the ice 84 can be effectively taken out until the ice 84 is almost completely lost. ..

In the first embodiment, three water sprinkling pipes were used, but the number of sprinkling pipes is not limited to this, and the point is to arrange the water sprinkling pipes so that water can be sprayed over the entire water surface of the heat storage tank. .. Also,
Although three temperature sensors are used, the number of temperature sensors is not limited to this, and the point is that it is only necessary to detect a position with ice and a position without ice in the heat storage tank. Further, instead of the temperature sensor, ice thickness sensors may be provided at several places in the heat exchange coil for ice making.

FIG. 4 shows a second embodiment of the ice heat storage device according to the present invention, and the same or similar members as those shown in the first embodiment will be designated by the same reference numerals. To do. The flexible tube 88 is connected from the middle of the pipe 64 described in the first embodiment, and the tip of the flexible tube 88 is connected to the sprinkler pipe 90. Further, two arms 92, 94 extend upward from the facing portion at the upper end of the heat storage tank 22, and a water spray pipe drive rail 96 is arranged above the water surface 66 of the heat storage tank 22. The water spray pipe 90 is fixed to the water spray pipe drive device 98, and when the water spray pipe drive device 98 moves on the water spray pipe drive rail 96, the water spray pipe 90 also moves. Further, the three temperature sensors 79, 80, 82 are provided at predetermined positions in the heat storage tank 22 as in the first embodiment.

As a result, the three temperature sensors 79,
Since the presence or absence of ice 84 in the heat storage tank 22 can be detected based on the temperature measurement results of 80 and 82, the water spray pipe 90 can be moved to the position where the ice 84 is present and water sprayed based on the detection result. The same effect as the first embodiment can be obtained. Next, FIG. 5 shows a third embodiment of the ice heat storage device according to the present invention, and the same or similar members as those shown in the first embodiment will be designated by the same reference numerals. ..

One side of the flexible tube 104 is connected to the tip of a pipe 102 extending upward from the defrosting water intake port 50 in the heat storage tank.
The other side of 04 and the three-way valve 52 are connected. Further, the tip of the pipe 102 is attached to a driving device 106, and the driving device 106 is a rail 1 installed vertically.
It can move up and down on 08. As a result, the deicing water inlet 50 can be moved between the water surface and the water bottom of the heat storage tank. Further, a temperature sensor 100 capable of detecting four positions in the vertical direction is provided along the pipe 102 for defrosting water intake 50.

The operation of the ice heat storage device configured as described above will be described. Since the density of water is maximum at 4 ° C., 4
The ice-melting water having a high density of ° C forms a layer below the heat storage tank, and the ice-melting water having a density lower than that of 1 to 2 ° C at 4 ° C forms a layer above the heat storage tank 22. Tend. For this reason, a temperature distribution layer of the deicing water may occur in the heat storage tank 22. In this case, since the deicing water inlet 50 is movable between the water surface 66 and the water bottom of the heat storage tank 22, water is taken from the layer of the defrosting water having the lowest temperature with respect to the temperature distribution of the defrosting water in the heat storage tank 22. be able to. Thereby, the low temperature cold water can be efficiently recovered.

In the third embodiment, as a means for moving the deicing water intake port, the pipe of the deicing water intake port is moved on the rail by operating the drive motor. The mouth may be provided in the vertical direction to switch the deicing water intake for water intake. Further, the position where the temperature sensor is provided is not limited to the vicinity of the defrosting water intake, and it may be provided at several places in the heat storage tank.

[0023]

As described above, according to the ice heat storage device of the first invention, a plurality of water sprinklers having a valve mechanism are arranged above the water surface of the heat storage tank, and ice is stored in the heat storage tank. One or more detection sensors for detecting the presence / absence position are provided, and the valve mechanism of the sprinkler pipe is opened / closed based on the detection result.
As a result, when there is ice in the entire heat storage tank,
When water is sprinkled from all of the water spray pipes to increase the size of the ice, and when the ice storage progresses to positions with and without ice in the heat storage tank, a position without ice among the plurality of water spray pipes It is possible to spray water only from the sprinkler pipe at the position where ice is present by closing the valve mechanism of. As a result, the deicing water sprinkled from the sprinkling pipe can always come into direct contact with the ice, so that the deicing efficiency can be improved and the latent heat of the ice can be effectively taken out until the ice is almost completely consumed. You can

According to the ice heat storage device of the second invention,
A moving means for moving the water sprinkling pipe along the water surface of the heat storage tank was provided, and further one or more detection sensors for detecting the presence / absence of ice were provided in the heat storage tank. Thereby, the water spray pipe can be moved to the position where ice is present in the heat storage tank to spray water, and the same effect as described above can be obtained. Further, according to the third invention, a moving means for moving the deicing water inlet between the water surface of the heat storage tank and the water bottom is provided, and a detection sensor for detecting the temperature distribution of the defrosting water in the heat storage tank is provided as the defrosting water. Plural pieces were arranged along the moving direction of the intake. As a result, the deicing water inlet can be moved according to the temperature distribution in the vertical direction of the deicing water generated in the heat storage tank. I can take it out well.

Therefore, in the ice heat storage device of the above invention, the sprinkled deicing water does not easily come into contact with the ice, even though the ice remains in the heat storage tank as in the conventional ice heat storage device. The disadvantage of not being able to effectively extract the latent heat of is eliminated.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of an ice heat storage device according to the present invention.

FIG. 2 is an operation explanatory view of the first embodiment of the ice heat storage device according to the present invention.

FIG. 3 is an operation explanatory view of the first embodiment of the ice heat storage device according to the present invention.

FIG. 4 is a configuration diagram of a second embodiment of the ice heat storage device according to the present invention.

FIG. 5 is a configuration diagram of a third embodiment of the ice heat storage device according to the present invention.

FIG. 6 is a configuration diagram of a conventional ice heat storage device.

[Explanation of symbols]

 20 ... Ice heat storage device 22 ... Heat storage tank 24 ... Heat exchange coil 28 ... Flying pump 30 ... Heat source device 50 ... Thawing water intake 54 ... Thawing water pump 56 ... Air conditioner 68,70,72 ... Sprinkling pipes 74,76,78 ... Two-way valve 79, 80, 82 ... Temperature sensor 98, 106 ... Moving means

Claims (3)

[Claims] 1. The inside of the heat storage tank by brine circulation returning from the heat exchange coil outlet provided so as to be submerged in water filled in the heat storage tank to the heat exchange coil inlet via a brine pump and cooling means. An ice making device for making water from the water storage device, and a dewatering water pump provided in the vicinity of the bottom of the water in the heat storage tank, an air conditioner, and a heat spraying pipe provided above the heat storage tank to the heat storage tank. In the ice heat storage device, which comprises an ice-melting device that uses the ice-melting water of ice produced in the heat storage tank by the circulation of the ice-melting water to return to the tank as a cold heat source of the air conditioner, the spray pipe is connected to the water surface of the heat storage tank. A plurality of detection sensors for detecting the presence / absence of ice are provided at a predetermined position in the heat storage tank, and a plurality of detection sensors are provided above each of the water spray pipes. Based on the results, Ice thermal storage apparatus, characterized in that closes. 2. The inside of the heat storage tank by brine circulation returning from the heat exchange coil outlet provided so as to be submerged in water filled in the heat storage tank to the heat exchange coil inlet via a brine pump and cooling means. An ice making device for making water from the water storage device, and a dewatering water pump provided in the vicinity of the bottom of the water in the heat storage tank, an air conditioner, and a heat spraying pipe provided above the heat storage tank to the heat storage tank. In the ice heat storage device, which comprises an ice-melting device that uses the ice-melting water of ice produced in the heat storage tank by the circulation of the ice-melting water to return to the tank as a cold heat source of the air conditioner, the spray pipe is connected to the water surface of the heat storage tank. Along with a moving means for moving the sprinkler pipe based on the detection result of the detection sensor. Specially to spray water Ice thermal storage device to. 3. The inside of the heat storage tank by brine circulation returning from the heat exchange coil outlet provided so as to be submerged in the water filled in the heat storage tank to the heat exchange coil inlet via a brine pump and cooling means. An ice making device for making water from the water storage device, and a dewatering water pump provided in the vicinity of the bottom of the water in the heat storage tank, an air conditioner, and a heat spraying pipe provided above the heat storage tank to the heat storage tank. In an ice heat storage device comprising an ice-melting device that uses the ice-melting water of the ice made in the heat storage tank by the circulation of the ice-breaking water to return to the tank as a cold heat source of the air conditioner, Provided with a moving means for moving between the water surface and the bottom of the tank and a plurality of detection sensors for detecting the temperature distribution of the deicing water along the moving direction of the deicing water intake, based on the detection result of the detection sensor The position of the defrosting water intake Ice thermal storage device, characterized in that the water intake changed.