JP2009103388A - Ice transfer system, and ice water conveyance system using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ice transfer system capable of efficiently carrying out the ice storage of a large volume for a plurality of heat storage tanks, and an ice water conveyance system using it. <P>SOLUTION: The ice transfer system includes the plurality of heat storage tanks A-D, and communication pipes 1-4, the heat storage tanks A-D are made to sequentially communicate with each other, and ice water is sequentially transferred to the heat storage tanks A-D. The plurality of heat storage tanks A-D includes input tanks A supplied with ice from an icemaker, and end tanks D serially communicating from the input tank A being the last heat storage tank. The system is formed so that water levels of ice water stored in the heat storage tanks become sequentially lower from the input tank A toward the end tank D. The communication pipes between the end tank D and the input tank A are provided with transfer pumps 5 for conveying the ice water from the end tank D toward the input tank A, suction openings of the communication pipes 1-4 are formed in water surface neighborhoods of the heat storage tanks A-D, and delivery openings of the communication pipes 1-4 are formed in lower parts of the heat storage tanks A-D. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an ice transfer system used for an ice heat storage system of a cold heat source machine and an ice water transport system using the ice transfer system. In the following description, an ice heat storage air conditioning system is described as an example.

There is a tendency to adopt a heat storage heat source system that uses nighttime power as a heat source for cooling the building. Among these, the ice thermal storage 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 large temperature difference using low water temperature. At the same time, the air conditioning system is also required to be transported with high-density cold heat, and it is desired to realize an ice water transport 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 reduce the power per transfer heat amount, and CO ₂ emissions during system introduction and operation A reduction in volume can be expected.

  In such an ice storage air conditioning system, a single ice storage tank may be used or a plurality of ice storage tanks may be used. In a building such as a building, a double slab, which is a space between a floor slab and a foundation slab on the lowest floor of the building, is used as a plurality of heat storage tanks. As described above, it is preferable to use a double slab underground in an existing building as a heat storage tank because there are great merits such as space saving and shortening of a construction period, and it can be applied to an existing building.

  When performing ice heat storage with respect to the plurality of heat storage tanks, it is necessary to move the ice by connecting the heat storage tanks with a communication pipe. As described above, Patent Document 1 discloses an ice heat storage device that stores ice by moving ice to a plurality of heat storage tanks. This ice heat storage device is an ice heat storage device consisting of a plurality of heat storage water tanks, pumps and piping for transferring water from each water tank to a heat load, and an ice making device, and the water in the water tank separated from the ice making device is directly connected to the ice making device by a pump. The ice generated in the water tank directly connected to the ice making device is transferred to another water tank together with the overflow water of the water tank by sending it to the water tank.

Japanese Patent Laid-Open No. 5-340567

  However, the ice heat storage device of Patent Document 1 moves the ice together with the overflow water to another water tank. Since ice has a specific gravity smaller than that of water, if ice is supplied from the upper side of the water tank, the ice cannot be efficiently stored in the water tank. That is, it is preferable from the viewpoint of heat storage efficiency and heat storage capacity that the plurality of heat storage tanks are filled with ice up to the lower part of the heat storage tank.

  This invention considers the said prior art, Comprising: It aims at provision of the ice water conveyance system which can perform large-capacity ice storage efficiently with respect to several thermal storage tanks.

  In order to achieve the object, the invention of claim 1 includes a plurality of heat storage tanks and a communication pipe for communicating the heat storage tanks, and the heat storage tanks communicate with each other in series by the communication pipe. In the ice transfer system that sequentially moves ice water to each heat storage tank, the plurality of heat storage tanks are connected to a series of input tanks that are supplied with ice from an ice making machine, and the final heat storage through the input tanks. A terminal tank corresponding to the tank, and formed so that the water level of the ice water stored in each of the heat storage tanks decreases in order from the charging tank to the terminal tank, between the terminal tank and the charging tank The communication pipe is provided with a transport pump for transporting the ice water from the terminal tank toward the charging tank, the suction pipe of the communication pipe is provided near the water surface of the heat storage tank, and the discharge port of the communication pipe Is provided at the bottom of the heat storage tank. To provide a stem.

  Further, the invention according to claim 2 is characterized in that the opening end of the suction port is open upward.

  According to a third aspect of the present invention, using the ice transfer system according to the first or second aspect, the charging tank communicates with a secondary side facility via a main pipe having a loop, and the charging tank and the main tank The pipe is connected by a supply pipe and a discharge pipe, supplies ice water in the charging tank to the main pipe through the supply pipe, and discharges water in the main pipe to the charging tank through the discharge pipe. An ice water transport system is provided.

  According to the invention of claim 1, since the suction port of the communication pipe is provided in the vicinity of the water surface of the heat storage tank and the discharge port of the communication pipe is provided in the lower part of the heat storage tank, the ice accumulated near the water surface is efficiently sucked into the communication pipe. By discharging this from the lower part of the heat storage tank, ice can be efficiently stored in the heat storage tank. That is, since the ice rises in the heat storage tank, there is nothing that hinders the circulation of ice in the vicinity of the discharge port by discharging the ice from the lower part, so that the ice can be moved smoothly. Thereby, large-capacity ice heat storage in the entire heat storage tank becomes possible.

  Moreover, since ice water is conveyed toward a charging tank from a terminal tank using a conveyance pump, a water level difference arises in each thermal storage tank with the pump power. Since ice is moved using this water level difference, ice can be moved more efficiently. Moreover, since ice water circulates through each heat storage tank by a conveyance pump, it becomes possible to store ice while maintaining fluidity, and it is possible to convey ice to the secondary side. Further, since the ice can be moved without providing a movable part in the heat storage tank, the apparatus is not complicated. Therefore, since it can be easily installed, it can be easily applied to a plurality of heat storage tanks using existing double slabs.

  According to the second aspect of the present invention, since the opening end of the suction port opens upward, the ice that collects on the water surface can be moved uniformly through the communication pipe. Therefore, ice can be moved (transfer ice) efficiently and quickly.

  According to the third aspect of the present invention, ice water is supplied to the annularly looped main pipe communicating with the secondary side equipment, and the water is discharged together with this, so that the ice filling rate (IPF (Ice Packing Factor)) can be increased, and further high-density cold transfer is possible. Thereby, the pump flow rate of the main pipe, that is, the pump power can be reduced, and the operation efficiency of the entire system can be increased.

  The present invention includes a plurality of heat storage tanks and a communication pipe that communicates each of the heat storage tanks, the heat storage tanks communicated in series with the communication pipe, and ice water is sequentially supplied to the heat storage tanks. In the ice transfer system to be moved, the plurality of heat storage tanks include an input tank to which ice from an ice making machine is supplied, and a terminal tank that communicates with the final heat storage tank in series from the input tank. From the tank toward the terminal tank, the water level of the ice water stored in each of the heat storage tanks is formed so as to decrease in order, and the communication pipe between the terminal tank and the charging tank is connected to the terminal tank from the terminal tank. A transport pump for transporting the ice water toward the charging tank is provided, the suction port of the communication pipe is provided in the vicinity of the water surface of the heat storage tank, the discharge port of the communication pipe is provided at the lower part of the heat storage tank, This is an ice transfer system that can move smoothly. .

  FIG. 1 is a schematic plan view of a plurality of heat storage tanks used in the ice transfer system according to the present invention.

  In the figure, four heat storage tanks A, B, C, and D are shown. Each heat storage tank A-D is connected by the communication pipes 1-4, respectively. Through the communication pipes 1 to 4, the heat storage tanks A to D are continuously communicated and circulated. The communication pipe 4 that connects the heat storage tank (terminal tank) D and the heat storage tank (input tank) A is provided with a transport pump (slurry pump) 5. Ice water is stored in each of the heat storage tanks A to D. The ice water circulates fluidly in the heat storage tanks A to D through the communication pipes 1 to 4.

  FIG. 2 is a schematic cross-sectional view showing a state where the heat storage tanks of FIG. 1 are deployed side by side.

  As illustrated, ice water including ice 6 is stored in each of the heat storage tanks A to D. The ice water in the heat storage tank D is conveyed to the heat storage tank A by driving the transfer pump 5. Therefore, the water level of the heat storage tank D is lowered and the water level of the heat storage tank A is raised. Along with this, the water level decreases in order from the heat storage tanks A to D. At this time, ice water in each of the heat storage tanks A to D also circulates and circulates in each of the heat storage tanks A to D through the communication pipes 1 to 4. Therefore, it is possible to store heat at high density by effectively using each of the heat storage tanks A to D.

  Thus, since the ice 6 is moved (ice transfer) using the water level difference, the ice can be moved efficiently. Moreover, since ice water circulates through each heat storage tank AD by the conveyance pump 5, it becomes possible to store ice while maintaining fluidity, and the ice 6 can be conveyed to the secondary side. In addition, since the ice 6 can be moved without providing a movable part in the heat storage tanks A to D, the apparatus is not complicated. Therefore, since it can be easily installed, it can be easily applied to a plurality of heat storage tanks using existing double slabs.

  The suction ports 1a to 4a of the communication pipes 1 to 4 are installed near the water surface. Thereby, the ice accumulated near the water surface can be sucked into the communication pipe efficiently, and the movement efficiency of the ice 6 is improved. Moreover, the discharge ports 1b-4b of the communication pipes 1-4 are installed in the lower part of heat storage tank AD. Accordingly, the discharge ports 1b to 4b are installed in a place where there is nothing to prevent the ice 6 from flowing in consideration of the specific gravity of the ice 6 that the ice 6 rises to the water surface side. Therefore, the ice 6 can be moved smoothly. For this reason, large-capacity ice heat storage in the entire heat storage tanks A to D becomes possible.

  The open ends of the suction ports 1a to 4a of the communication pipes 1 to 4 are open toward the upper side. Thereby, the ice 6 which gathers on the water surface can be moved uniformly through the communication pipes 1-4. Therefore, the ice 6 can be moved (ice transfer) efficiently and quickly. When the opening ends of the suction ports 1a to 4a are turned sideways, the ice 6 existing above the opening end cannot be moved. At this time, since the amount of the ice 6 to be moved increases as the diameter of the communication pipe increases, the ice can be transferred more rapidly.

  In addition, the distance between the open ends of the suction ports 1a to 4a and the water surface is set in consideration of the specific gravity and size of the ice 6 and the ice filling rate in each of the heat storage tanks A to D. This setting can be performed by adjusting the flow rate of the transport pump 5. Therefore, a step is also formed in the height of the open ends of the communication pipes 1 to 4 so that the water levels of the heat storage tanks A to D generated by the pump 5 are taken into consideration. For example, when a 10 mm square ice 6 is moved and the flow rate is 0.1 m / s and the diameter of the communication pipe is 50 mm, the distance between the open end and the water surface is sufficient. If the 20 mm square ice 6 is moved, it is preferable to provide 18.4 mm or more.

  Moreover, in order to raise the suction efficiency of the ice 6, you may provide a hopper in the opening end of the suction inlets 1a-4a, and may open an opening end. Thereby, quicker ice transfer is possible.

  FIG. 3 is a schematic plan view showing another example of a plurality of heat storage tanks.

  As shown in the figure, the heat storage tanks A to D are not arranged side by side in one direction as shown in FIG. 1, but are folded back in the heat storage tanks B and C so that the input tank A and the terminal tank D are adjacent to each other. Also good. If it does in this way, arrangement | positioning of the communicating pipe from the terminal tank D to the input tank A can be performed easily, and the restriction | limiting on a piping layout will not be received.

  In the ice transfer system and the ice water transport system according to the present invention, the ice contained in the ice water that is the object to be transported may be a so-called block shape or a so-called sherbet shape, but can avoid the sintering phenomenon. It is preferable to use block ice. Block ice is preferable because of its high density and easy flow characteristics. The present invention is a system that can reliably convey such block ice.

  FIG. 4 is a schematic view of an ice water transport system using the ice transfer system according to the present invention.

  As shown in the figure, the charging tank A communicates with the secondary side equipment 8 that is a cooling heat source machine such as an air conditioner via a main pipe 7 that forms a loop. The charging tank A and the main pipe 7 are connected by a supply pipe 9 and a discharge pipe 10. The charging tank A is filled with ice from the ice making machine 11. Ice making is performed, for example, by pumping water in the charging tank A by the pump 15. As described above, the filled ice is moved by the transfer pump 5 so as to be circulated to the heat storage tanks A to D.

  The cold heat used in each secondary-side facility 8 is supplied from the charging tank A. At this time, ice water in the charging tank A is supplied into the main pipe 7 through the supply pipe 9, and at the same time, only water in the main pipe 7 is discharged into the charging tank A through the discharge pipe 10. Thereby, the ice filling factor (IPF (Ice Packing Factor)) in the main pipe 7 can be increased, and further high-density cold transfer can be performed. Specifically, it can be increased to nearly 50% while the conventional ice filling rate is about 10%. Therefore, the flow rate of the pump 12 provided in the main pipe 7, that is, the pump power can be reduced, and the operation efficiency of the entire system can be increased.

  The suction port of the pump 13 provided in the supply pipe 9 is preferably near the water surface of the charging tank A. Thereby, the ice collected on the water surface can be efficiently moved to the main pipe. Reference numeral 14 denotes a bypass pipe for conveying high-density cold heat to the downstream side of the main pipe 7. As described above, the main pipe 7 has an independent annular loop shape. Therefore, it is possible to convey higher-density cold heat than the one-loop shape including the heat storage tank. Furthermore, by forming the main pipe 7 closed as described above, the load in the main pipe 7 is not applied to the pump 13 of the supply pipe 9. Therefore, the power of the pump 13 can be reduced.

It is a schematic plan view of the some thermal storage tank used for the ice transfer system which concerns on this invention. It is a schematic sectional drawing which shows the state which arranged each heat storage tank of FIG. 1 side by side, and was expand | deployed. It is a schematic plan view which shows the other example of a some heat storage tank. It is the schematic of the ice water conveyance system using the ice transfer system which concerns on this invention.

Explanation of symbols

1-4: communication pipe, 5: transfer pump, 6: ice, 7: main pipe, 8: secondary side equipment, 9: supply pipe, 10: discharge pipe, 11: ice making machine, 12: pump, 13: pump , 14: bypass pipe, 15: pump, AD: heat storage tank

Claims (3)

A plurality of heat storage tanks;
A communication pipe for communicating each heat storage tank;
With the communication pipe, the heat storage tanks communicate with each other in a series, and in the ice transfer system that moves ice water sequentially with respect to the heat storage tanks,
The plurality of heat storage tanks are provided with an input tank to which ice from an ice making machine is supplied, and a terminal tank that communicates with the final heat storage tank in series from the input tank,
From the charging tank to the terminal tank, the water level of the ice water stored in each of the heat storage tanks is formed so as to decrease in order,
The communication pipe between the terminal tank and the charging tank is equipped with a transport pump for transporting the ice water from the terminal tank toward the charging tank,
The ice transfer system according to claim 1, wherein a suction port of the communication pipe is provided near a water surface of the heat storage tank, and a discharge port of the communication pipe is provided at a lower portion of the heat storage tank.   The ice transfer system according to claim 1, wherein an opening end of the suction port opens upward.   The charging tank communicates with secondary equipment via a main pipe having a loop, and the charging tank and the main pipe are connected by a supply pipe and a discharge pipe, and ice water in the charging tank is connected through the supply pipe. The ice water transport system using the ice transfer system according to claim 1, wherein water in the main pipe is discharged to the charging tank through the discharge pipe.

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