JP2016008747A - Heat exchange system using massive ice - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchange system using massive ice capable of providing cold water with stable temperatures without the need for a high output pump during transportation of iced water containing massive ice.SOLUTION: A heat exchange system 1 comprises: a main pipeline 2 through which iced water containing massive ice 5 flows; a branch-pipe conduit line 3 branched from the main pipeline 2; a tank 4 to which the iced water from the main pipeline 2 flows via the branch-pipe conduit line 3; a circulation path 7 through which coolant circulates so that a heat exchanger 8 through which the coolant heated-up by load side equipment 10 flows and the tank 4 are communicated with each other; a pump 15 disposed along the circulation path 7 for draining only cold water containing none of the massive ice 5; and a return conduit line 14 branched from the circulation path 7 on the downstream side of the heat exchanger 8 so as to communicate with the main pipeline 2.

Description

  The present invention relates to a heat exchange system using block ice that performs heat exchange with water obtained from ice water containing block ice.

There is a tendency to adopt a heat storage type heat source system that uses nighttime power as a heat source for cooling the building. Among these, an ice heat storage type air conditioning system is considered as an effective method because of its advantages such as compactness, high nighttime operation rate, and reduction of transport power such as pumps and fans due to a large temperature difference using low water temperature. At the same time, the air conditioning system is also required to have high-density cold heat transfer, and it is desired to realize an ice water transfer system that adds latent heat of ice. Compared to the water transfer system that uses only sensible heat of water, the ice water transfer system is considered to be able to reduce the main piping system and power consumption per transfer heat amount, and CO ₂ emissions during system introduction and operation A reduction in volume can be expected.

  Patent Document 1 discloses a method of taking out ice water from an ice storage tank. The method of patent document 1 is conveying ice water toward a heat exchanger. In other words, water mixed with ice flows in the pipe for performing heat exchange. However, a pump for transporting only water cannot be used for transporting such ice water. For example, it is necessary to use a pump with a somewhat high output such as a slurry pump.

Japanese Patent No. 2804120

  The present invention is based on the above prior art, and does not require a high-output pump when conveying ice water containing massive ice, and heat exchange using massive ice that can provide cold water at a stable temperature The purpose is to provide a system.

  In order to achieve the above object, in the present invention, a main pipe through which ice water containing massive ice flows, a branch pipe branching from the main pipe, and the ice water from the main pipe flows through the branch pipe. A tank, a heat exchanger through which cooling water heated by a load-side device flows, and a circulation path that circulates the tank in communication with each other; a chilled water that is arranged in the circulation path and does not include the block ice from the tank A heat exchange system using lump ice, comprising: a pump for discharging only the gas; and a return pipe branched from the circulation path on the downstream side of the heat exchanger and communicating with the main pipe. provide.

  Preferably, the circulation path is formed by an outgoing line and a return line that are arranged on the upstream side and the downstream side of the heat exchanger and communicates the tank and the heat exchanger, and the outgoing line is , Connected to the lower side of the tank.

  Preferably, the return pipeline is connected to the upper side of the tank.

  Preferably, the tank is provided with a rod-shaped light emitter extending vertically downward from the upper side inside the tank and a camera for photographing the light emitter, and a monitor for visually recognizing an image taken by the camera is disposed outside the tank. It is arranged.

  Preferably, a plurality of the branch pipes and the circulation paths are provided for the main pipe, and an auxiliary pipe extending from the upper side of the tank and communicating with the main pipe is provided.

  According to the present invention, the tank in which the ice water containing only the lump ice is stored in the circulation path through which the cold water used for the heat exchange flows. It is possible to alleviate temperature changes in cold water. For this reason, the cold water of the stable temperature can be provided with respect to a heat exchanger. Also, paying attention to the property that lump ice rises (floats) in water, it is possible to easily separate lump ice and water in the tank by using such lump ice. On the other hand, a relatively low-power pump capable of transporting only water is sufficient when the cold water flows out. For this reason, in spite of using lump ice, a high output pump becomes unnecessary for cold water conveyance, and energy and cost can be reduced. Accordingly, since the cold water used for heat exchange is cold water that does not include lump ice, a heat exchanger that is generally used is sufficient. Therefore, there is no need to use an expensive heat exchanger that can be applied to ice water (water containing either sherbet-like ice or lump ice).

  Further, if the outgoing pipe is connected to the lower side of the tank, the massive ice is located on the upper side of the tank, so that it is possible to prevent the massive ice from flowing into the circulation path by mistake.

  In addition, if the return pipe is connected to the upper side of the tank, the massive ice is located on the upper side of the tank, so that the cold water heated by the heat exchanger can flow into the area where the massive ice is accumulated. It is possible to prevent a sudden temperature change in the tank due to the inflow of the raised cold water.

  Further, by providing the light emitter inside the tank, it can be confirmed by the monitor that the block ice has accumulated in the tank up to a position where the light emission cannot be visually recognized by the block ice.

  In addition, when a plurality of circulation paths including a heat exchanger are provided for the main pipe, the tank can be used as a sub-plant by providing an auxiliary pipe that returns massive ice from the upper side of the tank to the main pipe. Heat interchange between buildings can be performed.

It is the schematic of the heat exchange system using the lump ice which concerns on this invention. It is the schematic of the heat exchange system using another lump ice based on this invention. It is the schematic which shows an example of the structure for confirming the quantity of the block ice in a tank.

  As shown in FIG. 1, the heat exchange system 1 using lump ice according to the present invention is not a so-called sherbet-like ice, but ice water containing only lump ice having a solid shape is used as cold water for heat exchange. It is used for. Therefore, the present invention is not applicable to ice water containing sherbet-like ice. The present invention functions as a solution for solving a specific problem in the case of using block ice. For this reason, in this specification, unless otherwise specified, water containing only massive ice is referred to as “ice water”.

  The system 1 includes a main pipe 2. Ice water flows in the direction of arrow A in the main pipe 2. Although not shown, a main tank that stores ice water is provided at the upstream end of the main pipe, and ice water is supplied from here to the main pipe 2. A plurality of main pipes 2 may be connected to the main tank. A branch pipe 3 is provided branching from the main pipe 2. The branch pipe 3 is connected to the tank 4. Ice water from the main pipe 2 flows in the branch pipe 3, and this ice water flows into the tank 4. Therefore, massive ice 5 is stored in the tank 4 together with the water 6. The water 6 stored in the tank 4 is used as cold water in heat exchange. Since the cold water (water 6) is kept at a constant temperature by the block ice 5 in the tank 4, the temperature of the cold water supplied for heat exchange can be stabilized. The branch pipe 3 is provided with a valve 16 for controlling the inflow of ice water from the main pipe 2. Further, when the ice water in the main pipe 2 has a low flow rate or when the lump ice 5 in the main pipe 2 has a low density, the lump ice 5 is unevenly distributed above the main pipe 2 due to the buoyancy of the lump ice 5. Become. For this reason, the branch pipe 3 is connected to the upper part of the main pipe 2.

  The tank 4 is formed as a part of a circulation path 7 through which cold water circulates. A heat exchanger 8 is disposed in the circulation path 7. A cooling water pipe 9 further passes through the heat exchanger 8. The cold water passing through the circulation path 7 is heat-exchanged with the cooling water passing through the cooling water pipe 9 in the heat exchanger 8. A load side device 10 is disposed in the cooling water pipe 9. The cooling water is used in the load-side device 10 to increase the temperature, and is cooled by the cold water in the heat exchanger 8. And it is used for the load side apparatus 10 again. That is, the cooling water flows in the direction of arrow D through the cooling water pipe 9. The flow of this cooling water is controlled by the pump 11.

  On the other hand, in other words, the circulation path 7 can be said to be two pipe lines that allow the tank 4 and the heat exchanger 8 to communicate with each other. That is, the circulation path 7 includes a forward conduit 12 that communicates the heat exchanger 8 disposed upstream of the heat exchanger 8 and the tank 4, and a heat exchanger 8 disposed downstream of the heat exchanger 8. It can be said that it has a return conduit 13 communicating with the tank 4. The water 6 in the tank 4 flows as cold water in the outgoing pipe 12 toward the heat exchanger 8 in the direction of the arrow B, and after heat exchange is performed in the heat exchanger 8, the inside of the return pipe 13 is directed to the tank 4. It flows in the direction of arrow C. The water 6 flows out to the outgoing pipe 12 through the filter 27 disposed in the tank 4. The flow of cold water in the circulation path 7 is realized by a pump 15 disposed in the circulation path 7. The ice water in the main pipe 2 flows into the branch pipe 3 by driving the pump 15 and the action of a three-way valve 17 described later. In the example shown in the figure, a flow meter 18 for measuring the flow rate of the cold water is disposed in the forward pipeline 12.

  By providing the structure described above, the tank 4 in which the ice water including the block ice 5 is stored is disposed as a part of the circulation path 7 through which the cold water used for heat exchange flows. Can alleviate sudden temperature changes in cold water due to heat exchange. For this reason, cold water having a stable temperature can be provided to the heat exchanger 8. In addition, since the lump ice 5 has the property of rising (floating) in water, the lump ice 5 rises and is located on the upper side in the tank 4, and the water 6 is located on the lower side of the tank 4. . By paying attention to such a property of the lump ice 5, the lump ice 5 and the water 6 can be easily separated in the tank 4. As a result, when the cold water is allowed to flow out from the tank 4 to the circulation path 7, a relatively low output pump 15 that can transport only the water 6 is sufficient. That is, in the present system 1, despite the use of the block ice 5, a high-power pump is not required for conveying cold water, and energy and cost can be reduced. Since the cold water used for heat exchange is water that does not include the lump ice 5, the heat exchanger 8 that is generally used is also sufficient. Therefore, there is no need to use an expensive heat exchanger that can be applied to ice water (water containing either sherbet-like ice or lump ice). That is, since it has the structure which can convey lump ice with the piping, valve | bulb, and heat exchanger which are used conventionally, it is advantageous from a viewpoint of reliability and workability besides cost. This is because it is not necessary to use complicated and expensive structures, parts, etc. for conveying ice water.

  On the other hand, in the heat exchange system 1 using block ice according to the present invention, all the ice water extracted from the main pipe 2 is returned to the main pipe 2 again, and there is no so-called closed circuit (no open circuit) Pipe). That is, the heat exchange system 1 is connected only to the main pipe 2 and is not connected to other pipes. In other words, the heat exchange system 1 has the branch line 3 and the return line 14 as the open ends of the pipes through which the ice water flows, and all the open ends of these lines are connected to the main pipe 2. Thereby, a high pressure can be obtained and the circulation of the block ice 5 can be performed efficiently. In addition, even if the system 1 is provided with a pipeline having an open end such as an auxiliary pipeline 23 described later, all are connected to the main pipeline 2.

  A return line 14 further branches from the return line 13. The return line 14 is connected to the main pipe 2. That is, the return pipe line 14 branches off from the circulation path 7 on the downstream side of the heat exchanger 8 and communicates with the main pipe 2. Thereby, the cold water in the circulation path 7 can be returned to the main pipe 2 and new ice water can be supplied to the tank 4. A three-way valve 17 is disposed at a branch point between the return line 13 and the return line 14. By using this three-way valve 17, it is possible to control how much cold water is returned to the tank 4, the main pipe 2, or both.

  Here, the outgoing pipe 12 is connected to the lower side of the tank 4. In the example shown in the figure, the forward pipe 12 is connected to the lower end of the tank 4. Thereby, since the lump ice 5 is located on the upper side of the tank 4, it is possible to prevent the lump ice 5 from flowing into the circulation path 7 by mistake. Therefore, cold water consisting only of water 6 can be reliably supplied to the circulation path 7. For this reason, it is possible to prevent an excessive load from being applied to the pump 15 for circulating only water.

  Further, the return conduit 13 is connected to the upper side of the tank 4. Thereby, since the lump ice 5 is located on the upper side of the tank 4, the cold water heated by the heat exchanger 8 can be flown into the area where the lump ice 5 is accumulated. A sudden temperature change in the tank 4 can be prevented. In other words, since the raised cold water is directly applied to the block ice 5, the cold water heated efficiently using the block ice 5 can be cooled.

  A method of using the system 1 will be briefly described. Ice water from the main pipe 2 is extracted at the branch pipe 3, separated into bulk ice 5 and water 6 by the tank 4, and only the water 6 is supplied to the heat exchanger 8 as cold water. The tank 4 in which the lump ice 5 is stored becomes a so-called buffer tank, and the temperature of the cold water can be stabilized. Therefore, when a predetermined amount of lump ice 5 is stored in the tank 4, the valve 16 is closed and the buffer ice is stored. Circulation operation using a tank (tank 4) can be performed. At this time, since the operation is performed while melting the block ice in the tank 4, it can also be called an ice-free operation. With respect to the amount of extraction from the main pipe 2, the delivery amount of the pump 15 is controlled by the three-way valve 17 according to the load side device 10 with reference to the flow meter 18 and the like. The circulation path 7 and the return pipe line 14 are provided with valves 19 to 22 for appropriately adjusting the flow rate of the cold water. In addition, as a result of experimenting with flowing sherbet-like ice through the main pipe 2, it was found that sherbet-like ice would not easily enter the branch pipe 3. Therefore, in the present invention, the ice flowing into the main pipe 2 is lumped as described above. Limited to ice 5.

  When a plurality of circulation paths 7 including the heat exchanger 8 as described above are provided for the main pipe 2 and each of the circulation paths 7 is provided with the branch pipe 3, the upper side of the tank 4 and the main pipe 2 are communicated. It is preferable to provide an auxiliary line 23. In this case, the load side device 10 can be regarded as a building or a consumer. When a plurality of circulation paths 7 including the heat exchanger 8 are provided for the main pipe 2, the auxiliary pipe 23 for returning the block ice 5 from the upper side of the tank 4 to the main pipe 2 is provided, so that the tank 4 It can be used as a plant, and for example, heat interchange between buildings can be performed. In addition, you may arrange | position the pump 24, the two-way valve 25, and the valve | bulb 26 suitably to the auxiliary pipeline 23. FIG. In the example shown in the figure, the auxiliary pipeline 23 is connected to the upper end of the tank 4, and the upper side of the tank 4 is formed in a reverse taper shape so that the block ice 5 can be easily introduced into the auxiliary pipeline 23. The lump ice 5 is collected at the upper end of the tank 4 along the tapered surface.

  When the tank 4 is used as a subplant, a structure as shown in FIG. 2 may be used. That is, a connecting pipe 33 that branches from the branch pipe 3 is provided, and the connecting pipe 33 is connected to the lower portion of the tank 4. A strainer 34, a valve 35, and a pump 36 are disposed in the connection pipe line 33. In addition, only the valve 26 is disposed in the auxiliary pipeline 23. In the example of FIG. 1, a slurry pump is necessary for the pump 24 in order to circulate the lump ice 5 extracted from the tank 4 into the auxiliary conduit 23, but the structure shown in FIG. A normal relatively low-power pump capable of transporting only water as 36 is sufficient. When the tank 4 is used as a sub-plant, it is normally considered that only water is flowing in the main pipe 2, but it is also used in a state where the block ice 5 is flowing by arranging a strainer 34. be able to.

  As shown in FIG. 3, the tank 4 is provided with a rod-shaped light emitter 28 extending vertically downward from the upper side inside the tank 4. The light emitter 28 is, for example, an LED light. In the tank 4, a camera 29 for photographing the light emitter 28 is further provided. The camera 29 is connected to a monitor 30 disposed outside the tank 4. An image captured by the camera 29 can be visually recognized by the monitor 30. With such a configuration, the amount of massive ice 5 in the tank 4 can be confirmed visually. That is, even if the light emitter 28 emits light, the light is blocked by the block ice 5 in the portion where the block ice 5 is stored, and the camera 29 cannot capture the light. Therefore, it is possible to detect the image that the block ice 5 has been stored up to a level where light emission can be confirmed. In the illustrated example, the block ice 5 is stored up to a level indicated by E. Thus, in order to visually recognize the level at which the lump ice 5 is stored, it can be said that the light emitter 28 preferably has a rod shape.

  Here, the light emitter 28 may be connected to the power supply connection portion 32 and the monitor 30 via the control relay 31. Thus, since the light emitter 28 can be controlled to emit light only when the monitor 30 recognizes an image, the light emission time of the light emitter 28 can be minimized, which contributes to power saving.

1: heat exchange system using block ice, 2: main pipe, 3: branch pipe, 4: tank, 5: block ice, 6: water, 7: circulation path, 8: heat exchanger, 9: cooling water pipe Path, 10: load side device, 11: pump, 12: forward line, 13: return line, 14: return line, 15: pump, 16: valve, 17: three-way valve, 18: flow meter, 19: Valve: 20: Valve, 21: Valve, 22: Valve, 23: Auxiliary line, 24: Pump, 25: Two-way valve, 26: Valve, 27: Filter, 28: Luminescent body, 29: Camera, 30: Monitor , 31: control relay, 32: power supply connection part, 33: connecting line, 34: strainer, 35: valve, 36: pump

Claims (5)

Main piping through which ice water containing massive ice flows,
A branch pipe branching from the main pipe;
A tank into which the ice water from the main pipe flows through the branch pipe;
A circulation path for circulating the heat exchanger through which the cooling water heated by the load side device flows and the tank in communication with each other;
A pump that is arranged in the circulation path and that causes only the cold water that does not contain the lump of ice from the tank to flow out;
A heat exchange system using block ice, comprising a return pipe branching from the circulation path downstream of the heat exchanger and communicating with the main pipe. The circulation path is formed by an outgoing line and a return line that are arranged on the upstream side and the downstream side of the heat exchanger and communicate with the tank and the heat exchanger,
2. The heat exchange system using lump ice according to claim 1, wherein the forward pipe is connected to a lower side of the tank.   The heat exchange system using lump ice according to claim 2, wherein the return pipeline is connected to an upper side of the tank. The tank is provided with a rod-shaped light emitter extending vertically downward from the upper side of the tank and a camera for photographing the light emitter,
The heat exchange system using lump ice according to any one of claims 1 to 3, wherein a monitor capable of visually recognizing an image taken by the camera is disposed outside the tank. A plurality of the branch pipes and the circulation path are arranged with respect to the main pipe,
The heat exchange system using lump ice according to any one of claims 1 to 4, wherein an auxiliary pipe line extending from an upper side of the tank and communicating with the main pipe is disposed.

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