KR101092393B1 - Cold energy storage container with auxiliary expansion structures - Google Patents

Abstract

The present invention relates to a cold storage container having an expansion auxiliary structure in which the heat transfer performance is kept constant during operation of the cold storage cooling device so that the brine temperature at the outlet of the cold storage container can be kept constant.
The cold storage container having an expansion auxiliary structure according to the present invention stores or discharges the cold heat required for cooling through the solidification of the phase change material and the melting of the phase change material in thermal contact with the brine at the boundary of the heat conductive wall. In the cold storage container, when the phase change material is changed from solid to liquid by the heat of brine absorbed through the wall, the liquid phase change material temporarily present between the wall and the solid phase change material is compressed and removed. In order to be able to, it is characterized in that the expansion auxiliary structure is further provided to adhere the solid phase change material toward the wall.

Description

Cold energy storage container with auxiliary expansion structures

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold storage container having an expansion auxiliary structure, and more particularly to a solidification and melting phase of a phase change material (hereinafter referred to as PCM) in a cold storage cooling device. A container for storing or releasing the cold energy required for cooling by using change, when a relatively hot brine transfers heat through a metal wall to a relatively low temperature PCM near the metal wall. By discharging the molten liquid PCM remaining in the outside to bring the solid PCM into close contact with the metal wall, the heat transfer performance is better than before, and the heat transfer performance is kept constant during the operation of the cooling device, It relates to a cold storage container having an expansion auxiliary structure, the brine temperature can be kept constant.

A refrigeration cooler is a generic term for a chiller that stores the cold heat required for cooling (i.e., the energy required for cooling) in advance and uses this cold heat when needed. For example, as shown in FIG. 1, when heat is intermittently generated, cold heat required for cooling is prepared in advance for a long time and used when needed.

In general, a non-cooled cooling device requires a refrigerator having a capacity that can cope with the maximum calorific value of the system because the heat generated by the system performing the work must be discharged to the outside of the system in real time. In this case, the refrigeration chiller prepares and retains the cold heat for a relatively long time so that a smaller capacity chiller can be used than the freezer of the refrigeration chiller. As such, the cold storage device uses a relatively small capacity refrigerator by averaging thermal loads, thereby reducing the electric peak load.

In addition, when the maximum calorific value of the system is temporarily increased, the quenching chiller can cope with such a temporary maximum calorific value change by increasing the amount of stored cold heat, but the non-cold chiller needs to install more freezers. It is not easy to cope with fluctuation of heat load.

There are two types of quenching methods, one of which uses latent heat generated when the phase of a material changes, and the other uses sensible heat. In general, latent heat is larger than sensible heat, and there is an advantage in that heat can be stored or released without a change in temperature. In most regenerative cooling devices, a latent heat storage type is mainly used.

Among them, the PCM axial cooling system using a solid-liquid phase change has advantages in that the PCM can be easily handled in a solid or liquid state and can be operated at atmospheric pressure, and thus is mainly used in the axial cooling system. However, the thermal conductivity of the PCM is generally very low, and the heat transfer performance is poor. Therefore, there is a need for improvement.

The cold storage container, which is one of the core components of the PCM cold storage device, is a container for storing the cold heat required for cooling using the phase change latent heat during melting or solidification of the PCM.

Currently, various types of cold storage containers are used, but in particular, as illustrated in FIGS. 2 and 3, the cold storage containers 1 and the capsules having the PCM 3 filled around the cooling pipes 2 through which brine flows are formed. 6) The cold storage container 5 in which the PCM 7 exists and the brine 8 flows around the capsule 6 is mainly used.

The temperature of brine flowing into the cold storage vessel after cooling the heat generated in the system is relatively higher than the temperature of the PCM, as shown in FIG. In addition, the farther the PCM is from the conductive metal (ie, the metal wall), the lower the temperature. Therefore, heat is transferred from the relatively high temperature brine to the lower temperature PCM through the conductive metal, thereby lowering the temperature of the brine. In contrast, the PCM, which has absorbed heat through the conducting metal, changes its phase from solid to liquid, with most of the heat transferred from the brine to the PCM in terms of melting heat (solid-liquid phase change). Absorbed in the form of latent heat). Over time, the amount of molten PCM (i.e., liquid PCM) increases, and the heat transfer performance is increased because the phase boundaries of the solid PCM and the liquid PCM become farther away from the conducting metal (e.g., metal walls). This decreases.

Therefore, the temperature at the outlet of the cold storage container increases with time, even if the temperature of the brine at the inlet of the cold storage container is constant, as can be seen from the graph shown in FIG.

As described above, the conventional cold storage container shown in FIGS. 2 and 3 has a long heat transfer path as the operating surface of the conventional cold storage container becomes far from the conductive metal (metal wall) of the solid PCM and the liquid PCM. Lose. As a result, heat is transmitted through the liquid PCM having low thermal conductivity, so that the cooling performance of the cold storage cooling device or the cold storage container is lowered.

Therefore, in order to secure the performance of the cold storage container, when the cold storage container is designed and manufactured in consideration of the heat storage and releasing capacity of the cold storage container at the final operation time, the size of the cold storage container becomes excessively large.

In addition, as described above, since the heat transfer performance decreases over time, the advantage of storing and dissipating heat without temperature change through the phase change of the PCM is not sufficiently exhibited.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and in a regenerative cooling device that stores or releases the cold heat required for cooling by using a solid-liquid phase change of PCM, the brine is cooled at a relatively high temperature during the brine cooling. When heat is transferred to a relatively low temperature PCM through the wall, the liquid PCM remaining near the metal wall is pushed outward so that the solid PCM is in close contact with the metal wall, so that the heat transfer performance is kept constant during the operation of the cold storage cooling system. It is an object to provide a cold storage container that can be maintained.

A cold storage container having an expansion auxiliary structure proposed in the present invention is a cold storage type for storing or releasing cold heat required for cooling through solidification and melting of phase change materials in thermal contact with a brine on a thermally conductive wall. A refrigerating container of a cooling device, wherein when a phase change material changes from solid to liquid by heat of brine absorbed through the wall, the liquid phase change material temporarily present between the wall and the solid phase change material is compressed. And an expansion auxiliary structure for pressing the solid phase change material toward the wall so that the solid phase change material can adhere to the wall by removing the solid phase change material.

In one embodiment of the present invention, the storage refrigeration container having the expansion auxiliary structure is a storage refrigeration container filled with a phase change material around the plurality of cooling pipes flowing through the brine, the expansion auxiliary structure is installed around each cooling tube It is characterized by.

In another embodiment of the present invention, the cold storage container having the expansion auxiliary structure is a cold storage container filled with a phase change material around the plurality of cooling tubes flowing through the brine, wherein the expansion auxiliary structure is installed between the cooling tubes. It is done.

In another embodiment of the present invention, the cold storage container having the expansion auxiliary structure is a cold storage container having a phase change material in the capsule and a brine flows around the capsule, wherein the expansion auxiliary structure may be changed in volume within the capsule. Characterized in that the container is installed.

In addition, in one embodiment of the present invention, the expansion auxiliary structure is in the form of a rubber or metal sealed container, characterized in that the volume is configured to be expanded or contracted by air pressure or hydraulic pressure controlled through a regulator.

Further, in another embodiment of the present invention, the expansion auxiliary structure is a container made of rubber or metal, and a cylinder mechanism actuated by air pressure or hydraulic pressure is installed on the inner wall of the vessel to expand the volume by the piston movement of the cylinder mechanism. Or configured to be retractable.

In addition, in another embodiment of the present invention, the expansion auxiliary structure is a rubber or metal container, a screw mechanism for linear movement in conjunction with the rotational drive of the motor is installed on the inner wall of the container to the screw of the screw mechanism Characterized in that the volume is configured to be expanded or contracted by the linear motion.

On the other hand, it will be understood by those skilled in the art that many variations and modifications can be made in accordance with the present invention without departing from the spirit or scope of the invention, as shown in the following examples. will be. Therefore, the following examples are to be considered in all respects as illustrative and not restrictive of the invention.

The cold storage container having an expansion auxiliary structure of the present invention has the following effects.

First, since the phase change, ie, melting of the PCM occurs near the heat conductive metal wall, the heat transfer path between the brine and the phase change material is shortened, thereby facilitating heat transfer than the conventional cold storage container.

Second, during the operation time, since the heat transfer performance of the cold storage container is kept constant, the temperature difference between the phase change material and the brine melted at a constant temperature is kept the same, so that the brine temperature at the outlet of the cold storage container is kept constant.

Third, since the heat transfer is promoted as compared with the conventional cold storage container, it is possible to miniaturize the cold storage container.

1 is a conceptual view of the operation of the cold storage cooling device.
FIG. 2 is a schematic view illustrating a storage container of a cooling device of one embodiment according to a conventional configuration, in which a PCM is present around a cooling pipe group. FIG.
Figure 3 shows a cold storage container of another embodiment according to the conventional configuration, a schematic configuration diagram of the cold storage container with the PCM in the capsule and the brine flows around the capsule.
4 is a conceptual diagram illustrating a temperature distribution and a heat transfer method when the brine and the PCM are in thermal contact with a metal wall capable of heat conduction.
5 is a graph showing the brine temperature change of each position of the cooling tube with time.
6 is an operation conceptual view of a cold storage container having an expansion auxiliary structure according to the present invention.
Figure 7 is a schematic configuration diagram showing a state in which the expansion auxiliary structure according to an embodiment of the present invention is installed around the cooling tube.
8 is a schematic configuration diagram showing a state in which an expansion auxiliary structure according to another embodiment of the present invention is installed between cooling tubes.
9 is a view illustrating a state in which an expansion auxiliary structure according to another embodiment of the present invention is installed in a capsule, and schematically illustrating a case in which expansion of the expansion auxiliary structure is performed by air pressure.
FIG. 10 is a view corresponding to FIG. 9, wherein a schematic configuration diagram showing a case in which expansion of the expansion auxiliary structure is performed by a cylinder mechanism; FIG.
FIG. 11 is a view corresponding to FIG. 9, showing a schematic configuration in which the expansion of the expansion auxiliary structure is performed by a screw driven by a motor; FIG.

As described above, the present invention is a cold storage container of a cold storage cooling device that uses the solidification and melting of the PCM to store and release the cold heat required for cooling. It is a cold storage container that can be miniaturized by improving the efficiency. In addition, the present invention by pressing the molten liquid PCM between the wall and the solid PCM by pressing, the heat transfer path is kept constant during the operation time, so that the amount of heat transfer between the brine and PCM is constant at the outlet of the cold storage container It is a cold storage container that keeps the brine temperature at the same temperature at all times.

Features of the cold storage container according to the present invention will be more clear through the description of the following embodiments, but for convenience of description, the operation principle related thereto will be described as follows.

The cold storage container proposed in the present invention includes one or two or more expansion auxiliary structures capable of volume expansion. As shown in FIG. 6, the expansion auxiliary structure 14 installed in the PCMs 12 and 13 has a metal wall (when a liquid PCM 12 is formed between the metal wall 11 and the solid PCM 13). The solid PCM 13 is squeezed toward 11) to expand so that the liquid PCM 12 between the metal wall 11 and the solid PCM 13 can be removed.

When the solid PCM 13 is squeezed toward the metal wall 11 by the expansion of the expansion auxiliary structure, the liquid PCM 12 therebetween escapes to the surroundings and the solid PCM 13 is moved toward the metal wall 11 at the same time. It moves and makes contact. Therefore, the heat transfer path between the brine 10 and the solid PCM 13 is shortened again as the first time, and this happens repeatedly throughout the operation period, so that heat transfer is promoted as compared with the conventional cold storage container.

Examples

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

In addition, in describing the embodiments of the present invention, when it is determined that the detailed description of the related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

First, FIG. 7 and FIG. 8 show each embodiment in the case where there is a PCM around the cooling tubes 15 and 19 or the cooling tube group.

7 is a case where the expansion auxiliary structure 17 is provided in the outer periphery of each cooling tube 15, and the PCM 16 is filled between the expansion auxiliary structure 17 and the cooling tube 15. As shown in FIG. When the PCM 16 is melted, the volume of the expansion auxiliary structure 17 is expanded to bring the PCM 16 into close contact with the outer surface of the cooling tube 15.

Next, FIG. 8 is a case where the expansion auxiliary structure 20 is installed in the space between the cooling tubes 19, and the cylinder type PCM 18 surrounds each cooling tube 19, and has a cylinder form. It shows that the expansion auxiliary structure 20 is installed in the space between the PCMs 18 which were made. During melting of the PCM 18, the expansion auxiliary structure 20 capable of volume expansion is expanded to bring the PCM 18 into close contact with the outer surface of the cooling tube 19.

On the other hand, FIG. 9 is an embodiment when the PCM 22 exists in the capsule 21, and shows that the expansion auxiliary structure 23 expandable in the form of a column is provided in the center of the capsule 21. As shown in FIG. Upon melting of the PCM 22, the expansion auxiliary structure 23 capable of volume expansion is expanded to bring the PCM 22 into close contact with the inner surface of the capsule 21.

Meanwhile, FIG. 10 and FIG. 11, which will be described in detail below, together with FIG. 9 described above, illustrate respective embodiments of the expansion auxiliary structures 23, 27, and 31 according to the present invention.

Among them, as the expansion auxiliary structure 23 shown in Fig. 9, a sealed container made of rubber or metal can be used. Air pressure may be used to inflate the volume, in which case the volume expansion of the expansion auxiliary structure 23 is adjusted to the air pressure regulated through the regulator 25. The air pressure necessary for volume expansion can be obtained through air or a compressor filled in the cylinder 26. After volume expansion is complete, the bleed valve 24 is used to lower the pressure in the expansion auxiliary structure 23. Instead of air, a gas such as nitrogen or a fluid such as water and oil may be used.

Next, the expansion auxiliary structure 27 shown in FIG. 10 is in the form of a container made of rubber or metal, showing that a cylinder mechanism operated by pneumatic or hydraulic pressure is installed on the inner wall of the expansion auxiliary structure 27. These cylinder mechanisms are supported by the support S at the center of the expansion auxiliary structure 27. During melting of the PCM, the piston 29 protrudes from one or more cylinders 28 installed on the inner wall to bulge the inner wall of the expansion auxiliary structure 27 to the outside, thereby allowing heat conduction (not shown). ) Close to the PCM. Moreover, in order to prevent local deformation, it is preferable to provide the reinforcing material 30 at the end of the piston 29. On the other hand, when the amount of melting of the PCM is small and the volume expansion amount of the expansion auxiliary structure 27 is small, a piezoelectric element may be used.

Next, the expansion auxiliary structure 31 shown in FIG. 11 is in the form of a container made of rubber or metal, and the screw mechanism in which the screw 33 linearly moves in conjunction with the rotational drive of the motor 32 is an expansion auxiliary structure ( 31) is shown installed on the inner wall. These screw mechanisms are supported by a support S in the center of the expansion auxiliary structure 31. During melting of the PCM, one or two or more screws 33 installed on the inner wall of the expansion auxiliary structure 31 are rotated to bulge the inner wall of the expansion auxiliary structure 31 to the outside to form a heat conductive wall (not shown). Contact the PCM. In addition, in order to prevent local deformation, it is preferable to provide a reinforcing material 34 at the end of the screw 33. When the amount of melting of the PCM is small, a piezoelectric element may be used.

1 ... cooling container 2 ... cooling tube
3 ... PCM (phase change material) 5 ...
6 ... capsules 7 ... PCM
8 ... Brine 10 ... Brine
11 Metal wall 12 Liquid PCM
13 ... solid PCM 14 ... expansion auxiliary structure
15.Cooling pipe 16 ... PCM
17 ... Expansion auxiliary structure 18 ... PCM
19 ... cooling tube 20 ... expansion auxiliary structure
21 ... capsules 22 ... PCM
23 ... Expansion Auxiliary Structures 24 ... Extraction Valves
25 regulator 26 cylinder
27 ... expansion auxiliary structure 28 ... cylinder
29 Piston 30 Reinforcement
31 ... expansion auxiliary structure 32 ... motor
33.Screw 34 ... Reinforcement
S ... support

Claims (7)

In the cold storage container of the cold storage device for storing or releasing the cold heat required for cooling through the solidification of the phase change material and the melting of the phase change material in thermal contact with the brine at the boundary of the heat conductive wall,
When the phase change material is changed from solid to liquid by the heat of the brine absorbed through the wall, the solid phase is compressed and removed by temporarily removing the liquid phase change material between the wall and the solid phase change material. And an expansion auxiliary structure for pressing the solid phase change material toward the wall such that the change material adheres to the wall. The method of claim 1,
The cold storage container having the expansion auxiliary structure is a cold storage container in which a phase change material is filled around a plurality of cooling tubes through which brine flows.
The expansion auxiliary structure, the cold storage container having an expansion auxiliary structure, characterized in that installed around each cooling tube. The method of claim 1,
The cold storage container having the expansion auxiliary structure is a cold storage container in which a phase change material is filled around a plurality of cooling tubes through which brine flows.
The expansion auxiliary structure is a cold storage container having an expansion auxiliary structure, characterized in that installed between the cooling tube. The method of claim 1,
The cold storage container having the expansion auxiliary structure, there is a phase change material in the capsule and the brine flows around the capsule is a cold storage container,
The expansion auxiliary structure is a cold storage container having an expansion auxiliary structure, characterized in that installed in the form of a container that can change the volume in the capsule. The method according to any one of claims 1 to 4,
The expansion auxiliary structure is in the form of a sealed container made of rubber or metal material, the storage storage container having an expansion auxiliary structure, characterized in that the volume is expanded or contracted by the air pressure or hydraulic pressure controlled through the regulator. The method according to any one of claims 1 to 4,
The expansion auxiliary structure is a container made of rubber or metal, and a cylinder mechanism actuated by air pressure or hydraulic pressure is installed on the inner wall of the vessel, and the volume is expanded or contracted by the piston movement of the cylinder mechanism. A cold storage container having an expansion auxiliary structure. The method according to any one of claims 1 to 4,
The expansion auxiliary structure is a container made of rubber or metal, and a screw mechanism for linear movement in conjunction with a rotational drive of the motor is installed on the inner wall of the vessel, and the volume is expanded by linear movement to the screw of the screw mechanism. A cold storage container having an expansion auxiliary structure, characterized in that the contraction.

Images