Novel cold storage device for PCM phase change cold storage system

Abstract

The utility model discloses a novel cold storage device for a PCM phase change cold storage system. The novel cold storage device comprises a box body; the at least two partition plates are vertically arranged in the box body, the at least two partition plates enable the interior of the box body to form a snakelike turn-back flow channel, one end of each partition plate is connected with the inner wall of the box body in a sealed mode, and the other end of each partition plate is not connected with the inner wall of the box body; the ice plates are installed in the snake-shaped turn-back flow channel of the box body, and the ice plates are arranged in a stacked array mode to form a plurality of spaced water flow grooves; and a turbulent flow structure is arranged in the box body and is used for keeping water flow uniformly flowing through the spaced water flow grooves of the ice plate. According to the phase change material ice plate cold storage device, the flow channels in the cold storage device are separated, the flow speed of water flow in the spaced water flow grooves of the phase change material ice plate is increased, the cold release rate and the cold release amount of the cold storage device can be remarkably increased, and the energy-saving and cost-saving effects of the phase change cold storage technology in practical application are guaranteed.

Description

Technical Field

[0001] This utility model belongs to the technical field of PCM phase change cold storage system, and specifically relates to a novel cold storage device for PCM phase change cold storage system. Background Technology

[0002] Existing cold storage devices for phase change cold storage systems (such as...) Figure 1 As shown in the figure, in a cuboid cold storage device, there are buffer sections separated by flow equalization plates with small holes at the front and back. The length of the buffer section is usually 1m. Inlet pipe and outlet pipe are respectively provided in the buffer section. Small holes are evenly opened on the inlet pipe and outlet pipe. When low temperature water or high temperature water enters the cold storage device through the inlet pipe, the water flow is dispersed through the inlet pipe. The water flows through the gap between the ice plates containing phase change material. The water flow directly contacts the surface of the ice plate and exchanges heat, thereby realizing the cold storage or release of phase change material.

[0003] However, when the water flows into the box from the smaller cross-section pipe, the cross-section suddenly increases, causing the flow velocity to drop rapidly from a single-digit value (the economical flow velocity of central air conditioning ducts is generally 1-2.5 m / s) to below 0.01 m / s (for the same flow rate, the larger the cross-section, the lower the flow velocity). Convective heat transfer between the fluid and the ice plate relies on the macroscopic motion of the fluid to transfer heat. Too slow a flow velocity will inhibit this convective heat transfer. Fluid flow is mainly divided into laminar flow and turbulent flow. The heat transfer effect in turbulent flow is much better than that in laminar flow. When the flow velocity is too low, the fluid may be in a laminar state. The relative motion between the fluid and the heat exchange surface weakens, and the boundary layer (the fluid layer at the contact point between the fluid and the heat exchange surface, where the flow velocity gradually changes from zero velocity at the wall to the mainstream velocity) will thicken. The boundary layer is the main source of thermal resistance. Increased boundary layer thickness leads to increased thermal resistance, making heat transfer more difficult. Intermolecular mixing relies primarily on diffusion, thus reducing heat transfer efficiency. When the flow velocity is high enough to induce turbulence, the strong fluid disturbance enhances intermolecular mixing, thereby increasing the convective heat transfer coefficient. Therefore, a slow flow velocity is not conducive to forming good convective heat transfer conditions. When the fluid flow velocity is slow, the fluid's ability to carry dirt and impurities weakens, making these substances more likely to deposit on the heat exchange surface, forming a fouling layer. This fouling layer further increases thermal resistance and reduces heat transfer efficiency. Simultaneously, because the slow flow velocity reduces heat transfer efficiency, a longer time is required to achieve the same amount of heat transfer, which is highly disadvantageous in environments with strict environmental requirements.

[0004] Due to the structure and the kinematic viscosity of the fluid itself, water will flow slowly in a "surge in the middle, sag on both sides" pattern (e.g., Figure 2As shown in the figure, for the above-mentioned flow rate, the flow rate of the middle protruding part is relatively higher than that of the two sides, and the flow rate of the fluid on the two sides may be almost zero. The left and right sides will form flow dead zones in the box, and the heat exchange in these areas will be very weak, resulting in the cooling capacity of the phase change material ice plate being much less than the installed capacity. Utility Model Content

[0005] (1) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a novel cold storage device for PCM phase change cold storage systems. This novel cold storage device for PCM phase change cold storage systems aims to solve the problems of low cold release rate and cold release capacity that are far less than the installed capacity of existing cold storage devices for PCM phase change cold storage systems.

[0007] (2) Technical solution

[0008] To solve the above-mentioned technical problems, this utility model provides a novel cold storage device for a PCM phase change cold storage system, comprising:

[0009] Box;

[0010] At least two partitions are arranged vertically inside the housing, forming a serpentine flow channel inside the housing. One end of each partition is sealed to the inner wall of the housing, while the other end is not connected to the inner wall of the housing.

[0011] Ice plates are installed in the serpentine flow channel of the box, and the ice plates are arranged in a stacked array to form several spaced water flow channels;

[0012] The interior of the box is equipped with a turbulence structure, which is used to keep the water flow uniformly through the spaced water flow channels of the ice plate.

[0013] A water inlet pipe is fixedly installed on one side of the housing.

[0014] The water outlet pipe is fixedly installed on the other side of the box.

[0015] Furthermore, the turbulence structure includes an inlet buffer section and an outlet buffer section.

[0016] Furthermore, the water inlet buffer section corresponds to the position of the water inlet pipe, and two water inlet baffles arranged in front and behind are installed inside the water inlet buffer section to make the water flow in the water inlet pipe form a two-stage buffer.

[0017] Furthermore, the water inlet baffle plate is provided with a plurality of water inlet baffle holes evenly arranged to maintain the water flow uniformly through the interval water flow channel.

[0018] Furthermore, the water outlet buffer section corresponds to the position of the water outlet pipe, and two water outlet baffles arranged in front and behind are installed inside the water outlet buffer section to make the water flow of the water outlet pipe form a two-stage buffer.

[0019] Furthermore, the water outlet baffle plate is provided with a plurality of water outlet baffle holes evenly arranged to ensure that the water flows out of the box evenly from the spaced water flow channels.

[0020] (3) Beneficial effects

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] This invention significantly improves the cold release rate and capacity of the cold storage device by dividing the flow channels within the cold storage device and increasing the flow velocity of water in the spaced water channels of the phase change material ice plate. This ensures the energy-saving and cost-saving effects of phase change cold storage technology in practical applications. At the same time, by dividing the water channels, the "I-shaped" pipes at the inlet and outlet are omitted, which can effectively reduce the manufacturing cost and difficulty of the cold storage device. It can also improve the utilization rate of the internal space of the cold storage device and reduce the footprint of the cold storage device to a certain extent. This increases the possibility of using phase change cold storage technology in places with limited space and expands the application scope of phase change cold storage technology. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an existing cold storage device used in phase change cold storage systems;

[0024] Figure 2 This is a schematic diagram of the water flow pattern in an existing cold storage device used in a phase change cold storage system.

[0025] Figure 3 This is a three-dimensional schematic diagram of the present invention;

[0026] Figure 4 This is a top view of the present invention;

[0027] Figure 5 This is a utility model Figure 4 Schematic diagram of cross-section at point AA;

[0028] Figure 6 This is a schematic diagram of the ice plate stacking method of this utility model;

[0029] Figure 7 This is a utility model Figure 6 A top-view diagram of the ice plate;

[0030] Figure 8 This is a utility model Figure 6 Schematic diagram of cross-section at point BB;

[0031] Figure 9 This is a utility model Figure 8 A side view of the ice plate;

[0032] Figure 10 This is a schematic diagram of the water inlet baffle of this utility model;

[0033] The labels in the attached diagram are as follows: 1. Box body; 2. Divider plate; 3. Ice plate; 4. Water inlet pipe; 5. Water outlet pipe; 6. Turbulence structure; 61. Water inlet buffer section; 62. Water outlet buffer section; 611. Water inlet turbulence plate; 612. Water outlet turbulence plate. Detailed Implementation

[0034] This specific embodiment is a novel cold storage device for a PCM phase change cold storage system, and its structural schematic diagram is shown below. Figures 3-10 As shown, the novel cold storage device for PCM phase change cold storage system includes a housing 1, at least two partition plates 2, an ice plate 3, a water inlet pipe 4, and a water outlet pipe 5. The at least two partition plates 2 are vertically arranged inside the housing 1, forming a serpentine flow channel inside the housing 1. One end of each partition plate 2 is sealed to the inner wall of the housing 1, while the other end is not connected to the inner wall of the housing 1. The partition plates 2 are made of polypropylene (PP). The ice plate 3 is installed in the serpentine flow channel of the housing 1, and the ice plate 3 is arranged in a stacked array to form several spaced water flow channels. The water inlet pipe 4 is fixedly installed on one side of the housing 1, and the water outlet pipe 5 is fixedly installed on the other side of the housing 1. A turbulence structure 6 is provided inside the housing 1 to keep the water flow uniformly through the spaced water flow channels of the ice plate 3.

[0035] The turbulence structure 6 includes an inlet buffer section 61 and an outlet buffer section 62. The inlet buffer section 61 corresponds to the position of the inlet pipe 4. Two inlet turbulence plates 611 arranged front and back are installed inside the inlet buffer section 61 to form a two-stage buffer for the water flow of the inlet pipe 4. The inlet turbulence plates 611 are provided with a number of evenly arranged inlet turbulence holes to keep the water flow uniformly through the interval water flow channel. The outlet buffer section 62 corresponds to the position of the outlet pipe 5. Two outlet turbulence plates 612 arranged front and back are installed inside the outlet buffer section 62 to form a two-stage buffer for the water flow of the outlet pipe 5. The outlet turbulence plates 612 are provided with a number of evenly arranged outlet turbulence holes to keep the water flow uniformly out of the box 1 from the interval water flow channel.

[0036] This utility model's cold storage device eliminates the original "I-shaped" inlet and outlet pipes. Based on the width of the cold storage device housing 1 and the width of the phase change material ice plate 3, the water tank 1 is divided internally by a partition plate 2, employing a serpentine multi-channel design. According to the required width of the cold storage device housing 1 and the size of the ice plate 3, this utility model's cold storage device constructs multiple sequentially connected water channels, such as... Figure 4As shown, three water channels are constructed using two partition plates 2. Water enters from the inlet pipe 4 on one side of the tank 1, flows along the first water channel to the end, then turns and flows back into the adjacent second water channel. It then flows to the end of that water channel again, turns again, and enters the third water channel, finally flowing out from the outlet pipe 5 on the other side of the tank 1. Simultaneously, to prevent the fluid in the inlet pipe 4 from directly impacting the ice plates 3, the flow velocity is higher at the gaps between the ice plates 3 in the middle (height direction) of the inlet end, but lower at the gaps between the top and bottom ice plates, preventing the top and bottom ice plates from releasing coolness properly. Therefore, two inlet baffles 611 and two outlet baffles 612 are respectively installed in the inlet buffer section 61 and outlet buffer section 62 at corresponding positions on the inlet pipe 4 and outlet pipe 5, ensuring that the water flows evenly across the ice plates 3 and the tank 1. Specifically, the spaced water flow channel forms corresponding channels with the inlet and outlet baffle holes, allowing for a balanced arrangement of water inflow and outflow.

[0037] Therefore, by separating the flow channels within the cold storage device and increasing the flow velocity of water in the spaced water channels of the phase change material ice plate 3, this utility model can significantly improve the cold release rate and cold release capacity of the cold storage device, ensuring the energy-saving and cost-saving effect of phase change cold storage technology in practical applications. At the same time, by separating the water channels and omitting the "I-shaped" pipes at the inlet and outlet, the cost and difficulty of manufacturing the cold storage device can be effectively reduced (the larger the cold storage system, the larger the pipes, the more difficult the construction and support of the internal "I-shaped" pipes, and the larger the space required for the buffer section 6, the lower the space utilization of the cold storage device). It can also improve the internal space utilization rate of the cold storage device, and to a certain extent reduce the footprint of the cold storage device. This increases the possibility of using phase change cold storage technology in places with limited space and expands the application scope of phase change cold storage technology.

[0038] Specific application examples

[0039] like Figure 3-10 As shown: Taking a cold storage device with a cold storage capacity of 1000 RTH as an example, the existing cold storage device has a total length of 13 meters, a front and rear buffer section of 1 meter each, a width of 3 meters, and an ice plate stacking height of 2.6 meters.

[0040] Inside the housing 1, three parallel water channels are formed by two vertically arranged partitions 2, employing a serpentine flow design. Powered by a water pump on the outlet pipe 5, water flows forward from the inlet pipe 4 along the first channel, then turns at a 180° deflector at the end to enter the second channel in the reverse direction, and then turns again at the other end deflector to enter the third channel in the forward direction, finally exiting from the outlet pipe 5. This design increases the water velocity within the cold storage device while maintaining a constant residence time. Through three flow direction conversions, this design achieves efficient space utilization. The effective volume for stacking ice plates in the original cold storage device is 11 × 3 × 2.6 = 85.8 m³. 3The new type of cold storage device has stacked ice plates (such as...) Figure 6 The effective volume (as shown) is 13 × 3 × 2.6 - 2 × 1 × 1 × 2.6 = 96.2 m³. 3 The effective volume increases by about 12.1%, the installed capacity of the cold storage device increases by about 12.1%, and the serpentine flow channel design can increase the effective flow by 2.8-3.2 times compared with the original straight flow channel. At the same time, the multi-bend structure is conducive to the uniform distribution of the flow field and avoids flow dead zones. In addition, due to the reduction of the cross-section, the flow velocity increases, which enhances the convective heat transfer coefficient between the fluid and the ice plate surface and strengthens the heat transfer effect between the two.

[0041] The two cold storage devices were scaled down proportionally, and the same number of ice plates 3 were installed inside the housing 1. After the ice plates 3 had completed cold storage, the cold was released. The amount of cold released was measured by a flow meter and a thermometer installed on the pipeline. The results of multiple tests are as follows:

[0042]

[0043] Based on the above test results, it can be seen that in the application of phase change material-based cold storage technology, the cold storage device with the innovative serpentine multi-channel design of this utility model exhibits excellent cold release performance due to its unique channel structure and efficient heat exchange mechanism. Compared with the original cold storage device with a traditional structure, the serpentine multi-channel cold storage device greatly increases the effective contact area between the fluid and the phase change material during the cold release process by utilizing the parallel and tortuous fluid path design of multiple channels. At the same time, it optimizes the fluid flow path and velocity distribution, significantly enhancing the convective heat transfer effect. Through this design, under the same cold release time, environmental conditions, and phase change material filling amount, the serpentine multi-channel cold storage device can achieve a faster and more complete phase change process of the phase change material, thereby releasing a much greater amount of cold release than the original cold storage device, providing strong technical support for improving the cooling capacity and energy utilization efficiency of central air conditioning systems.

[0044] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A novel thermal storage device for PCM phase change thermal storage systems, characterized in that, The utility model relates to a water cooling device, which comprises: a box (1); at least two partition plates (2) vertically arranged in the interior of the box (1), which form a serpentine return flow channel in the interior of the box (1), one end of each partition plate (2) is sealingly connected with the inner wall of the box (1), and the other end is not connected with the inner wall of the box (1); an ice plate (3) installed in the serpentine return flow channel of the box (1), which is arranged in a laminated array to form a plurality of spaced water flow grooves; a turbulence structure (6) arranged in the interior of the box (1), which is used to keep the water flow uniform when flowing through the spaced water flow grooves of the ice plate (3); a water inlet pipe (4) fixedly installed on one side of the box (1); a water outlet pipe (5) fixedly installed on the other side of the box (1).

2. The novel regenerator for PCM phase change regenerative cooling system according to claim 1, characterized in that, The turbulence structure (6) comprises a water inlet buffer part (61) and a water outlet buffer part (62).

3. The novel regenerator for PCM phase change regenerative cooling system as claimed in claim 2, wherein, The water inlet buffer part (61) corresponds to the position of the water inlet pipe (4), and two water inlet turbulence plates (611) arranged in front and back are installed in the interior of the water inlet buffer part (61) to form two-stage buffering of the water flow of the water inlet pipe (4).

4. The novel regenerator for PCM phase change regenerative cooling system according to claim 3, characterized in that, The water inlet turbulence plates (611) are provided with a plurality of water inlet turbulence through holes arranged uniformly, which are used to keep the water flow uniform when flowing through the spaced water flow grooves.

5. The novel regenerator for PCM phase change regenerative cooling system as claimed in claim 2, wherein, The water outlet buffer part (62) corresponds to the position of the water outlet pipe (5), and two water outlet turbulence plates (612) arranged in front and back are installed in the interior of the water outlet buffer part (62) to form two-stage buffering of the water flow of the water outlet pipe (5).

6. The novel regenerator for PCM phase change regenerative cooling system as claimed in claim 5, wherein, The water outlet turbulence plates (612) are provided with a plurality of water outlet turbulence through holes arranged uniformly, which are used to keep the water flow uniform when flowing out of the box (1) from the spaced water flow grooves.

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