JP2679503B2 - Ice storage device - Google Patents

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 which brine is flowed through a heat transfer pipe connected to a refrigerator during ice making operation to make water in the heat storage tank, and during defrosting operation, air is thawed. The present invention relates to an ice heat storage device that sends ice-melting water that has undergone heat exchange in an air conditioner to a heat storage tank while being sent to a machine.

[0002]

2. Description of the Related Art There is a considerable difference in power demand between daytime and nighttime, and it is a major issue for power companies to level the amount of power used during daytime and nighttime. For this reason, the nighttime electricity charges have been reduced to encourage the effective use of nighttime electricity. Against this background, an ice heat storage device that makes ice at night and hits a cold heat source for air conditioning in the daytime has been highlighted, and various ice heat storage devices have been studied.

Among them, the static type ice-on-coil type is widely used. Conventionally, in this type of ice heat storage device, as shown in FIG. 2, a heat transfer coil 2 is installed so as to be submerged in water filled in the heat storage tank 1. The outlet of the heat transfer coil 2 is connected to the inlet of the refrigerator 4 via the brine pump 3 and the pipe 5, and further,
The outlet of the refrigerator 4 is connected to the three-way valve 15A, one of which is
The pipe 5 is connected to the inlet of the heat transfer coil 2 via the pipe 6, and the other is connected to the inlet of the brine pump 3 via the heat exchanger 14 and the pipe 7 by the pipe 5.

On the other hand, the lower part of the heat storage tank 1 is connected to the inlet of the air conditioner 8 via the deicing water pump 7 and the pipe 9, and the air conditioner 8
Three-way valve 15B from the outlet via heat exchanger 14 and piping 11.
One is connected to the sprinkler 10 above the heat storage tank 1, and the other is connected to the inlet of the deicing water pump 7 via the pipe 16 by the pipe 9. Next, the operation of the ice heat storage device having such a configuration will be described. The ice making operation is performed at night when the power cost is low, and the brine in the heat transfer coil 2 is sent to the refrigerator 4 by the brine pump 3. Then, it is cooled in the refrigerator 4 and returned to the heat transfer coil 2 via the three-way valve 15A and the pipe 6. By repeating this circulation, the water on the surface of the heat transfer coil 2 is made into ice, and a layer of ice 12 is gradually formed in a concentric pattern on the surface of the heat transfer coil 2.

On the other hand, the deicing operation is performed during the daytime with the operation of the air conditioner 8, and the deicing water 13 in the heat storage tank 1 is defrosted water pump 7.
Is sent to the air conditioner 8 and is heat-exchanged with the air-conditioning air (not shown) in the air-conditioner 8 to cool the air-conditioning air and the defrosting water 13 is heated, and then, through the heat exchanger 14 and the three-way valve 15B. , Part of which is returned from the sprinkler 10 to the heat storage tank 1 again, and the other part of the pipe 16
Return to the deicing water pump 7 via. At this time, three-way valve 15B
The temperature of the defrosting water at the inlet of the air conditioner 8 is controlled so as to match the set temperature by the opening degree.

By the circulation of the deicing water, the air conditioner 8 can generate cold air for air conditioning without operating the refrigerator 4 until the set temperature is maintained. When the set temperature is no longer maintained, the refrigerator 4 is started, and the outlet of the refrigerator 4 is passed through the three-way valve 15A, the heat exchanger 14, the pipe 7, and further through the brine pump 3 and the pipe 5. It is returned to the inlet of the refrigerator 4. As a result, the thawed water 13 and the brine are exchanged with each other in the heat exchanger 14.

In the conventional ice heat storage device described above, the ice-breaking water 13 returning from the water sprinkler 10 to the heat storage tank 1 during the ice-breaking operation is not uniformly sprayed on the entire ice 12 of the heat transfer coil 2, so that the ice 12
However, there is a problem in that the melting efficiency of the is not good and the deicing efficiency is poor.
In order to solve the above drawbacks, the following multi-tank type ice heat storage device has been proposed, though not shown in the figure.

That is, a plurality of water storage tanks and one empty heat storage tank are installed, and the refrigerator is operated at night to make water in the plurality of water storage tanks. During the daytime, as the air conditioner is operated, the defrosting water from one heat storage tank among the plurality of heat storage tanks is sent to the air conditioner, heat exchanged with the conditioned air in the air conditioner, and then sent to the empty heat storage tank. To be Then, when the water level of the heat storage tank in use drops to a certain level, a signal from a water level meter installed in the heat storage tank in use stops the deicing water supplied to the air conditioner, and another The defrosting water in the heat storage tank is sent to the air conditioner. And the thawed water that has been heat exchanged by the air conditioner
It is sent to the heat storage tank that was used first. At this time, since the heat transfer coil having an ice layer and exposed on the water surface directly contacts the deicing water, the deicing efficiency is improved. By sequentially performing this operation in a plurality of heat storage tanks, it is possible to supply the defrosting water having a stable temperature to the air conditioner.

[0009]

However, the conventional ice heat storage device shown in FIG. 2 has the following drawbacks as mentioned above. That is, since the defrosting water 13 returning from the water sprinkler 10 to the heat storage tank 1 is not sprayed on the entire ice 12 of the heat transfer coil 2, the ice on the surface of the heat transfer coil 2 is discharged before the deicing water 13 leaves the heat storage tank 1 again. The ice 12 on the surface of the heat transfer coil 2 passes through without contacting the ice 12, or conversely, the defrosting water 13 is stagnant, and a part of the ice 12 is easily melted and a part of the ice 12 is hard to melt.
However, the temperature of the deicing water 13 sent to the air conditioner 8 rises and is not stable.

In addition, when a sudden increase in air conditioning load or a desire to take out cold heat in a short time, it is necessary to increase the circulation amount of the deicing water 13 to cope with the increase in pump capacity, piping space, etc. It will be a factor of increase. On the other hand, the conventional ice heat storage device having a plurality of heat storage tanks, although eliminating the drawbacks of the conventional ice heat storage device, is provided with a plurality of heat storage tanks, the number of pipes is increased and the facility cost is increased, and Since the installation space is considerably large, there is a problem in that it is a space-saving type required in urban areas.

The present invention has been made in view of the above circumstances, and provides an ice heat storage device which can stabilize the temperature of the deicing water supplied to the air conditioner and can cope with a sudden increase in the air conditioning load. The purpose is to do.

In order to achieve the above object, the present invention provides a heat transfer coil installed so as to be immersed in water filled in a heat storage tank, and a refrigerator for cooling brine circulating in the heat transfer coil. An ice making device provided with a pipe and a brine pump arranged so that brine circulates between the heat transfer coil outlet and the refrigerator inlet, and between the refrigerator outlet and the heat transfer coil inlet, and the defrosting water of the heat storage tank It was arranged so that the defrosting water circulates between the air conditioner that exchanges heat with the defrosting water outlet of the heat storage tank, the defrosting water inlet of the air conditioner, and the defrosting water outlet of the air conditioning machine and the defrosting water inlet of the heat storage tank. A pipe and an ice-melting water pump, an ice-melting device provided with a pipe for circulating the ice-melting water, and a heat exchanger for exchanging heat between the brine and the ice-melting water, in an ice heat storage device, Brine circulates between the heat transfer coil and the heat exchanger during the thawing operation. Disposed the piping to, brine, characterized in that the de-ice a heat transfer medium.

[0013]

According to the present invention, during the thawing operation, brine circulates between the heat transfer coil and the heat exchanger, and the brine is used as the heat medium for thawing. To explain this effect, the brine in the heat transfer coil, which is cooled by ice formed on the surface of the heat transfer coil of the heat storage tank, is sent to the heat exchanger by the brine pump during the deicing operation, and the brine from the air conditioner is released. While exchanging heat with the ice water to cool the deicing water, the brine heats up and returns to the heat transfer coil to exchange heat with the ice adhering to the heat transfer coil again. By repeating this, the brine can cool the circulating defrosting water in the heat exchanger, and the heat transfer coil can melt the ice from the inside of the heat transfer coil.

As a result, the defrosting water in the heat storage tank returns to the heat storage tank again via the air conditioner and the heat exchanger, and the ice formed around the heat transfer coil is melted from the outer surface. Since the ice formed around the heat coil can be melted from the inside of the heat transfer coil, the efficiency of deicing can be improved,
It is possible to send the defrosting water with a stable temperature to the air conditioner, and to cope with a sudden increase in air conditioning load.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an ice heat storage device according to the present invention will be described in detail below with reference to the accompanying drawings. First, the structure of the ice making device will be described with reference to FIG. 1. The heat transfer coil 22 is installed so as to be buried in the heat storage tank 20 filled with water, and both ends of the heat transfer coil 22 are outside the heat storage tank 20. Out. From the brine outlet side of the heat transfer coil 22, a three-way valve 24A,
A pipe 30 is connected to the inlet of the heat pump 28 via the brine pump 26 and the three-way valve 24B.

Further, the heat pump 28 outlet is connected through the cross joint 36A, the two-way valve 32A and the cross joint 36B by the heat transfer coil 22 inlet pipe 34. That is, the brine circulates in the brine path during ice making shown by the solid arrow in FIG. Explaining the structure of the defroster, the heat pump 28 outlet pipe is branched into two by a cross joint 36A, one is connected to the three-way valve 24B at the heat pump 28 inlet, and the other is
A pipe 43 is connected to an inlet of a heat exchanger 40 that exchanges heat between the brine and the deicing water 38.

Further, the inlet pipe of the heat transfer coil 22 is also branched into two by a cross joint 36B, one of which is connected to the three-way valve 24A at the outlet of the heat transfer coil 22 and the other of which is the two-way valve 3.
A pipe 44 is connected to the outlet of the heat exchanger 40 via 2B. That is, the brine circulates in the brine path at the time of thawing shown by the broken line arrow in FIG. On the other hand, a pipe 50 is connected from the lower part of the heat storage tank 20 to the air conditioner 48 via the deicing water pump 46, and a pipe 52 is connected from the outlet of the air conditioner 48 to the inlet of the heat exchanger 40. Further, the outlet pipe 54 of the heat exchanger 40 is branched into two by the three-way valve 24C, and one of them is connected to the inlet of the deicing water pump 46 by a pipe 58.
And the other is connected to the sprinkler 60 above the heat storage tank 20 by a pipe 62. That is, the deicing water circulates through the deicing water path at the time of defrosting shown by the one-dot chain line arrow in FIG.

Next, the operation of the ice heat storage device having such a structure will be described. During the ice making operation, the three-way valve 24A at the outlet of the heat transfer coil 22 is designed so that the brine flows from the outlet of the heat transfer coil 22 to the brine pump 26 side. The three-way valve 24B on the inlet side of the heat pump 28 allows the brine pump 26 to flow to the heat pump 28. Further, the two-way valve 32A from the outlet of the heat pump 28 to the inlet of the heat transfer coil 22 is opened, and the two-way valve 32 from the outlet of the heat exchanger 40 to the inlet of the heat transfer coil 22 is opened.
Keep B closed.

Thus, the brine cooled by the heat pump 28 circulates between the heat transfer coil 22 and the heat pump 28 to cool the water near the surface of the heat transfer coil 22 to make ice.
The heat transfer coil 22 is operated at night when the electricity cost is low.
A layer of ice 23 is formed on the surface. Next, a description will be given of the operation of thawing ice. Before the operation of thawing ice, the three-way valve 24B on the inlet side of the heat pump 28 allows brine to flow from the brine pump 26 to the heat exchanger 40, and the heat transfer coil 22 from the heat exchanger 40 to The two-way valve 32B to the inlet is opened, and the two-way valve 32A from the heat pump 28 to the heat transfer coil 22 is closed.

With the operation of the air conditioner, the deicing water pump 46 operates, and the deicing water 38 in the heat storage tank 20 is sent to the air conditioner 48 to exchange heat with air conditioner air (not shown) to cool the air conditioner air. The thawed water 38 rises in temperature. The temperature of the thawed water 38 passes through the heat exchanger 40, part of which flows to the inlet of the thawed water pump 46, and the other returns from the sprinkler 60 to the heat storage tank 20. At this time, the opening of the three-way valve 24C controls the temperature of the deicing water at the inlet of the air conditioner 48 to match the set temperature.

The above operation is the case when the load of the air conditioner 48 is small and the amount of cold heat of the defrosting water 13 is small, and the conventional ice heat storage for defrosting the ice 23 adhering to the heat transfer coil 22 from the outer surface is performed. In the case of defrosting of the device, in the case where the temperature of the defrosting water 38 sent to the air conditioner 48 rises and is not stable in spite of a sudden increase in air conditioning load or ice 23, in the case of the ice heat storage device of the present invention, Thawing is performed as follows.

That is, while the conventional deicing operation is performed, brine is circulated between the heat transfer coil 22 and the heat exchanger 40 while the refrigerator 28 is stopped. As a result, the brine in the heat transfer coil is not covered by the ice 23 formed on the surface of the heat transfer coil 22.
Is cooled by the brine pump 26 and sent to the heat exchanger 40, and the heat exchanger 40 exchanges heat with the circulating defrosting water 38 to cool the defrosting water 38. On the other hand, the temperature of the brine rises and the heat transfer coil 22
Then, heat is exchanged with the ice 23 formed on the heat transfer coil 22 again. By repeating this, the brine can cool the circulating defrosting water 38 in the heat exchanger 40 and can melt the ice 23 from the inside of the heat transfer coil 22 in the heat transfer coil 22.
That is, the brine is used as a heat medium for defrosting.

As a result, during the deicing operation, the circulating defrosting water 38
The ice 23 formed on the heat transfer coil 22 can be thawed from inside the heat transfer coil 22 by the brine in addition to the conventional thawing that is performed on the outer surface of the ice 23. It can cope with an increase in air conditioning load.

[0024]

As described above, according to the ice heat storage device of the present invention, piping is provided so that the brine can circulate between the heat transfer coil and the heat exchanger during the defrosting operation, and the brine is unwound. As a heat transfer medium for ice, the ice formed on the surface of the heat transfer coil can be thawed from inside the heat transfer coil, and the ice formed on the surface of the heat transfer coil can be thawed from the outer surface. In addition, it is possible to stabilize the temperature of the circulating defrosting water and respond to a sudden increase in air conditioning load.

Further, the operation can be carried out to prevent bridging.

[Brief description of the drawings]

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

FIG. 2 is a configuration diagram showing an embodiment of a conventional ice heat storage device.

[Explanation of symbols]

 20 ... Heat storage tank 22 ... Heat transfer coil 26 ... Brine pump 28 ... Heat pump 38 ... Thawing water 40 ... Heat exchanger 46 ... Thawing water pump 48 ... Air conditioner

Claims (1)

(57) [Claims] 1. A heat transfer coil installed so as to be submerged in water filled in a heat storage tank, a refrigerator for cooling brine circulating in the heat transfer coil, a heat transfer coil outlet and a refrigerator inlet, and An ice making device equipped with a pipe and a brine pump arranged so that brine circulates between the refrigerator outlet and the heat transfer coil inlet, an air conditioner for exchanging heat with the defrosting water of the heat storage tank, and the heat storage tank Of the deicing water, the deicing water inlet of the air conditioner, the deicing water outlet of the air conditioner, and the pipe and the deicing water pump arranged so that the deicing water circulates between the defrosting water inlet of the heat storage tank. In an ice heat storage device comprising an ice-melting device and a heat exchanger provided in a pipe through which the ice- melting water circulates, for exchanging heat between the brine and the ice- melting water , a heat transfer coil and heat Arrange pipes so that brine circulates between the Ice thermal storage apparatus characterized by down is de-ice a heat transfer medium.