JP5414118B2 - Latent heat storage system - Google Patents

Description

  The present invention relates to a latent heat cold storage system using a cold storage material disposed in a heat storage tank.

  There is known a latent heat storage system that cools and stores a cold storage material. For example, in Patent Document 1, a heat medium liquid outlet is provided at one end of the tank, a heat medium liquid return port is provided at the other end of the tank, and the heat medium liquid is provided in the middle of the tank one end and the other end of the tank. A latent heat storage system for storing heat by providing an intermediate outlet is described. In this latent heat storage system, a heat storage material is disposed after the return port of the heat medium liquid and the intermediate outlet. In the cold heat storage operation, the heat transfer fluid is taken out from the intermediate discharge outlet while the temperature of the heat transfer fluid at the intermediate outlet is equal to or higher than the set temperature. It is taken out from the outlet, and returned to the return port after being cooled by the heat source device.

JP 2004-36996 A

  In the latent heat storage system described in Patent Literature 1, since the heat transfer fluid that has not been taken out from the intermediate outlet flows downstream, the temperature of the heat transfer fluid becomes lower on the downstream side than the intermediate outlet. For this reason, the temperature of the heat transfer liquid taken out from the outlet at one end of the tank is lowered by that amount, and the difference from the target cooling temperature of the heat transfer liquid becomes small. There was a problem of doing.

  This invention is made | formed in view of such a situation, The objective is to suppress the fall of the coefficient of performance of the refrigerator in a cool storage operation.

  In order to achieve the above object, a latent heat storage system according to the present invention includes a heat storage tank in which a heat medium liquid is stored, a refrigerator that cools the heat medium liquid taken out from the heat storage tank, and a refrigerator that is cooled by the refrigerator. Cooling by the refrigerator, the regenerator material that is stored cold by the heat transfer liquid, the partition wall that partitions the heat storage tank into a first area where the cool storage material is arranged and a second area where the cool storage material is not arranged And a supply unit for supplying the heat medium liquid to the first section or the second section, and an upper end of the partition wall is above the cold storage material and below the liquid surface of the heat medium liquid. Provided in a position on the side, the heat storage tank has an outlet for the heat transfer fluid liquid at a position above the cold storage material in the first section and below the upper end of the partition wall, The supply unit has the first section according to the temperature of the heat transfer liquid taken out from the heat storage tank. Adjusting the amount of supplied heat transfer fluid in an amount and the second section of the supply heat transfer fluid to said.

  According to the present invention, in the cold storage operation, when the supply unit supplies part of the heat transfer fluid to the second zone, the heat transfer fluid stored in the second zone flows into the first zone across the partition wall. Thereby, in the upper part of a 1st area, the heat-medium liquid cooled with the cool storage material in a 1st area and the uncooled heat-medium liquid which flowed in from the 2nd area are mixed. As a result, a heat transfer fluid having a temperature higher than that of the heat transfer fluid after passing through the cold storage material can be sent to the refrigerator, and a decrease in the coefficient of performance of the refrigerator can be suppressed.

  In such a latent heat storage system, the supply unit detects the temperature of the heat transfer fluid extracted from the heat storage tank, the amount of the heat transfer solution supplied to the first zone, and supplies the temperature to the second zone. A heat storage tank in the case of comprising a valve that adjusts the amount of the heat transfer fluid according to the valve opening and a controller that determines the valve opening of the valve according to the temperature detected by the temperature sensor; It is possible to easily adjust the temperature of the heat transfer fluid taken out from the tank.

  In this latent heat storage system, when the temperature difference between the target cooling temperature in the refrigerator and the temperature detected by the temperature sensor is equal to or greater than a determination reference value, the control unit determines that the total amount of the heat transfer fluid is in the first zone. The valve opening of the valve is determined so that a portion of the heat transfer fluid is supplied to the second zone when the temperature difference is less than the determination reference value. When the heat transfer fluid in the first section is cooled to near the target cooling temperature, it is possible to suppress a decrease in the coefficient of performance of the refrigerator.

  In such a latent heat storage system, the valve is opened so that the amount of the heat transfer fluid supplied to the second zone increases as the temperature of the heat transfer solution after the controller cools the cool storage material decreases. When configured to determine the degree, it is possible to more reliably suppress a decrease in the coefficient of performance of the refrigerator.

  In such a latent heat storage system, the heat storage tank has a first supply port for supplying the heat medium liquid to the first section below the cold storage material in the first section, and in the second section. When the second supply port for supplying the heat medium liquid is provided near the bottom of the tank in the second area, the cooled heat medium liquid is filled from the lower side of the first area or the second area. Thus, a large amount of heat transfer fluid having a high temperature can be taken out from the first zone or the second zone.

  ADVANTAGE OF THE INVENTION According to this invention, the fall of the coefficient of performance of the refrigerator in a cool storage operation can be suppressed.

It is a figure explaining the composition of a latent heat storage system. It is a perspective view explaining the internal structure of a water tank. It is sectional drawing explaining the internal structure of a water tank. It is a top view of a water tank. (A) is a front view of a cool storage material. (B) is a perspective view explaining a cool storage material module. It is a figure explaining the flow of water in a cool storage operation, Comprising: It is a figure explaining the flow in case the difference of the temperature of the water taken out from the water tank and target cooling temperature is larger than a judgment reference value. It is a figure explaining the flow of water in a cool storage operation, Comprising: It is a figure explaining the flow in case the difference of the temperature of the water taken out from the water tank and target cooling temperature is below a criterion value.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the latent heat cold storage system of the present embodiment includes a water tank 1, a refrigerator 2, a temperature sensor 3, a valve 4, a pump 5, and a control unit 6.

  The water tank 1 is a part for storing water as a heat transfer liquid, and corresponds to a heat storage tank. In this water tank 1, a plurality of cool storage material units 23 including a cool storage material 21 (see FIG. 5) are arranged, and cold storage is performed by freezing the cool storage material 21. The water tank 1 is divided into a first area 11 where the regenerator unit 23 is arranged and a second area 12 where the regenerator unit 23 is not arranged. An upper outlet 13 is provided in the upper part of the first area 11, a first lower outlet 14 is provided in the lower part of the first area 11, and a second lower outlet 15 is provided in the lower part of the second area 12. Is provided. These inlet / outlet ports 13 to 15 serve as outlets for taking out water from the water tank 1 or supply ports for supplying water into the water tank 1 in a cold storage operation or a cooling operation. The water tank 1 will be described in detail later.

  The refrigerator 2 is a device that cools the water extracted from the water tank 1 to the target cooling temperature in the cold storage operation, and the cooled water is returned to the water tank 1. If the temperature of the water taken out from the water tank 1 and entering the refrigerator 2 is too close to the target cooling temperature and the temperature difference is small, the refrigerator 2 becomes a partial load operation, and the coefficient of performance decreases.

  The temperature sensor 3 detects the temperature of water sent from the water tank 1 to the refrigerator 2 in the cold storage operation. The temperature sensor 3 of the present embodiment is provided in the upper pipe 7 a connected to the upper outlet / inlet 13. A detection signal from the temperature sensor 3 is output to the control unit 6. In addition, the temperature sensor 3 functions as a supply part which supplies the water cooled with the refrigerator 2 to the water tank 1 (1st area 11, 2nd area 12) with the valve 4 and the control part 6. FIG.

  The valve 4 is connected to the refrigerator 2 through the lower pipe 7b, connected to the first lower outlet 14 through the first individual pipe 7c, and connected to the second lower outlet 15 through the second individual pipe 7d. The valve 4 is a valve device for flowing water sent from the refrigerator 2 to the first lower outlet / inlet 14 or the second lower outlet / inlet 15, and its operation is controlled by the controller 6.

  The pump 5 sends the water taken out from the water tank 1 to the refrigerator 2. The operation of the pump 5 is also controlled by the control unit 6.

  The control part 6 is a part which controls the refrigerator 2, the pump 5, and the valve 4, and is comprised by a relay etc., or is comprised including CPU and memory. The controller 6 of the present embodiment determines the valve opening degree of the valve 4 according to the temperature detected by the temperature sensor 3 in the cold storage operation. That is, the ratio of the amount supplied to the first zone 11 of the aquarium 1 and the amount supplied to the second zone 12 is determined for the water delivered from the refrigerator 2.

  Next, the water tank 1 will be described in detail.

  As shown in FIGS. 2 to 4, the water tank 1 is partitioned from the periphery, and the inside thereof is a rectangular parallelepiped space. In this embodiment, the width W is 5 m, the length L is 7 m, and the height H is 3 m. A partition wall 16 is provided in the water tank 1. The partition wall 16 is a member that partitions the inside of the water tank 1 into a first section 11 and a second section 12, and is configured by a non-permeable plate-shaped member. The partition wall 16 is raised from the bottom surface of the water tank 1. Further, the height of the partition wall 16 is determined to be lower than the liquid level of the heat transfer fluid and higher than the upper outlet 13. With this configuration, water flows between the first section 11 and the second section 12 beyond the upper portion of the partition wall 16 (the portion above the upper end of the upper outlet 13).

  A gantry 17 is disposed at a position below the first section 11 and slightly higher than the bottom surface of the water tank 1 (specifically, a position slightly higher than the upper end of the first lower outlet / inlet 14). The gantry 17 is a member on which the cool storage material unit 23 is placed, and forms a space for running water below the cool storage material unit 23. For example, the gantry 17 is formed in a cross beam shape in which a plurality of members are assembled with a gap in the vertical and horizontal directions.

  The upper outlet 13 is provided in the first area 11 at a position where the lower end is above the upper end of the regenerator unit 23. The first lower outlet / inlet 14 is provided at a position below the regenerator unit 23 in the first section 11. As shown in FIG. 3, the second lower outlet / inlet 15 is provided near the bottom of the water tank in the second area 12.

  As shown in FIG. 5A, the regenerator 21 is a material in which a vertically long bag is filled with a paraffinic gel. When cooled to 16 ° C., a phase change occurs from a gel to a solid. That is, the cold storage material 21 is in a solidified state at a temperature of 16 ° C. or less. And when temperature exceeds 16 degreeC, it cools from the cool storage material 21 of a solidification state, and returns to gel form. As shown in FIG. 5 (b), the regenerator unit 23 is a unit in which a plurality of regenerators 21 are erected in a box 22 provided with openings for passing water at the ceiling and bottom. . In the cool storage material unit 23, a vertical space is formed between the cool storage materials 21 inside the box 22. For this reason, heat exchange can be performed with water flowing around the cold storage material 21 while ensuring water permeability in the vertical direction.

  Next, the operation in the cold storage operation of the latent heat cold storage system will be described.

  In the cold storage operation, the control unit 6 acquires the detection signal from the temperature sensor 3 and recognizes the temperature of the water flowing from the upper outlet / inlet 13. It is assumed that the water temperature at this stage is sufficiently higher (for example, 6 ° C.) than the target cooling temperature of 13 ° C. That is, it is assumed that the temperature difference between the water temperature and the target cooling temperature is greater than or equal to the determination reference value.

  In this case, as shown in FIG. 6, the control unit 6 determines the valve opening degree of the valve 4 so that the entire amount flows to the first lower outlet / inlet 14 side. That is, while the valve on the first lower outlet / inlet 14 side is sufficiently opened, the valve on the second lower outlet / inlet 15 side is fully closed. Thereby, all the water cooled by the refrigerator 2 flows into the 1st area 11 through the 1st lower outflow inlet 14 (1st supply port), and is used for cooling of the cool storage material 21. FIG. In addition, since the water from the refrigerator 2 does not flow into the 2nd area 12, the water supplied from the refrigerator 2 can be used for cooling of the cool storage material 21 without waste.

  After that, when the regenerator material 21 is cooled and the water temperature in the first zone 11 decreases and the temperature difference between the water temperature and the target cooling temperature becomes less than the judgment reference value, the control unit 6 sends some water to the second zone 12. The valve opening of the valve 4 is determined so that is supplied. That is, the valve on the first lower outlet / inlet 14 side is slightly throttled, and the valve on the second lower outlet / inlet 15 side is slightly opened from the fully closed state. Accordingly, as shown in FIG. 7, water flows into the second area 12 through the second lower outlet 15 (second supply port), so that the second area 12 and the partition wall 16 are passed to the first area 11. Water flows in. The water flowing in at this time is water stored in the second area 12 and has a temperature sufficiently higher than that of the water that has passed through the cold storage material 21. For this reason, water temperature can be raised by mixing with the water which passed the cool storage material 21 in the upper part of the 1st area 11. FIG. And sufficient temperature difference can be ensured between the temperature of the water sent to the refrigerator 2, and target cooling temperature, and the fall of the coefficient of performance of the refrigerator 2 can be suppressed.

  And in this system, since the water cooled with the refrigerator 2 is filled from the lower side of the 1st area 11 or the 2nd area 12, much hot water is taken out from the 1st area 11 or the 2nd area 12. Can do. In addition, since the water from the second section 12 flows in from above the upper surface of the regenerator unit 23 and the upper outlet 13 is provided above the upper surface of the regenerator unit 23, the mixed water goes downward. hard. For this reason, the malfunction that the cool storage material 21 is warmed by the mixed water can be suppressed.

  Thereafter, the control unit 6 continues to monitor the detection signal from the temperature sensor 3, and whenever the temperature of the water from the upper outlet 13 decreases, the amount of water flowing into the second area 12 increases. Determine the valve opening. That is, the valve opening degree of the valve that determines the inflow amount to the first section 11 side is decreased, and the valve opening degree of the valve that determines the inflow amount to the second section 12 side is increased. Thus, the lower the temperature of the water that has passed through the regenerator material 21, the greater the amount of water flowing into the second area 12, so even if the water in the first area 11 is cooled to near the target cooling temperature. The reduction in the coefficient of performance of the refrigerator can be suppressed.

  As described above, in the latent heat cold storage system of the present embodiment, in the cold storage operation, when the temperature of the water taken out from the first section 11 approaches the target cooling temperature, a part of the water from the refrigerator 2 is second. Supplied to area 12. Thereby, sufficiently high temperature water stored in the second section 12 flows into the upper part of the first section 11, and a sufficient temperature difference can be secured between the temperature of the water sent to the refrigerator 2 and the target cooling temperature. Moreover, the fall of the coefficient of performance of the refrigerator 2 can be suppressed.

  By the way, this invention is not limited to the above-mentioned embodiment, A various deformation | transformation is possible.

  For example, in the present embodiment, the water tank 1 is partitioned into the first area 11 and the second area 12 using the partition wall 16, but the present invention is not limited to this configuration. For example, the first section 11 may be distributed and arranged in the water tank 1 by a plurality of partition walls 16. In short, the inside of the water tank 1 should just be divided into the area where the cool storage material 21 is arrange | positioned, and the area where it is not arrange | positioned.

  The partition wall 16 may be made of any material as long as it is impermeable. And if the member which has heat insulation is used as the partition wall 16, the heat exchange between the 1st area 11 and the 2nd area 12 can be suppressed, and adjustment of water temperature becomes easy.

  The upper outlet 13 and the first lower outlet 14 are provided so that the upper outlet 13 is located above the regenerator 21 and the first lower inlet 14 is located below the regenerator 21. Can be determined as appropriate.

  Regarding the valve 4, a three-way valve or a two-way valve may be used. In short, it is only necessary to adjust the flow rate of the heat transfer fluid.

DESCRIPTION OF SYMBOLS 1 Water tank 2 Refrigerator 3 Temperature sensor 4 Valve 5 Pump 6 Control part 7a-7d Piping 11 1st area 12 2nd area 13 Upper outflow inlet (heat-medium liquid outlet)
14 First lower outlet (first supply port)
15 Second lower outlet (second supply port)
16 Partition wall 17 Base 21 Cold storage material 22 Box 23 Cold storage material unit

Claims (5)

A heat storage tank in which the heat transfer fluid is stored;
A refrigerator that cools the heat transfer fluid taken out of the heat storage tank;
A cold storage material that is stored cold by the heat transfer fluid cooled by the refrigerator;
A partition wall that divides the heat storage tank into a first area where the cold storage material is disposed and a second area where the cold storage material is not disposed;
A supply section for supplying the heat medium liquid cooled by the refrigerator to the first section or the second section,
The upper end of the partition wall is
Provided at a position above the cold storage material and below the liquid surface of the heat transfer fluid,
The heat storage tank
The outlet for the heat transfer fluid is located above the cold storage material in the first section and below the upper end of the partition wall,
The supply unit
The latent heat characterized by adjusting the amount of the heat transfer fluid supplied to the first zone and the amount of the heat transfer fluid supplied to the second zone according to the temperature of the heat transfer fluid taken out from the heat storage tank. Cold storage system. The supply unit
A temperature sensor for detecting the temperature of the heat transfer fluid taken out from the heat storage tank;
A valve for adjusting the amount of the heat transfer fluid supplied to the first zone and the amount of the heat transfer fluid supplied to the second zone according to the valve opening;
A control unit that determines the valve opening degree of the valve according to the temperature detected by the temperature sensor;
The latent heat cold storage system according to claim 1, comprising: The controller is
When the temperature difference between the target cooling temperature in the refrigerator and the temperature detected by the temperature sensor is greater than or equal to a criterion value, the valve opening of the valve is such that the entire amount of the heat transfer fluid is supplied to the first zone. And
3. The latent heat according to claim 2, wherein when the temperature difference is less than the determination reference value, the valve opening degree of the valve is determined so that a part of the heat transfer fluid is supplied to the second zone. Cold storage system. The controller is
The valve opening degree of the valve is determined so that the amount of the heat transfer fluid supplied to the second zone increases as the temperature of the heat transfer solution after cooling the cool storage material decreases. The latent heat storage system described in 1. The heat storage tank
A second supply port that has a first supply port for supplying the heat transfer fluid to the first zone below the cold storage material in the first zone and supplies the heat transfer fluid to the second zone. The latent heat cold storage system according to any one of claims 1 to 4, wherein the latent heat storage system is provided near the bottom of the tank in the second section.

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