Central air-conditioning water-cool thermal energy storage combined with phase change ice slab thermal energy storage system

Abstract

The present invention relates to the technical field of cold storage systems, and discloses a central air-conditioning water cold storage combined with phase change ice plate cold storage system, including a water tank and a phase change material module. The phase change material modules are stacked in the water tank, and the cross-section along the diameter direction of the water tank is spring-shaped. A cavity for accommodating the phase change material is provided in the phase change material module. An adjustment module is arranged in the water tank to drive the phase change material module to expand and contract along the depth direction of the water tank. When the adjustment module drives the phase change material module to expand and contract and at the same time drives the phase change material to fill the cavity of the phase change material module, when the adjustment module performs expansion and contraction adjustment on the phase change material module, it drives the electric push rod to press down the bracket to move. At this time, the first rack moves downward, driving the gear to rotate. On the other side of the gear, the second rack moves upward, driving the movable ring to move upward along the inner wall of the water tank, and unfolding the stacked phase change material modules, increasing the volume ratio of the phase change material module in the water tank to cope with the change and fluctuation of cold energy release when switching between peak hours and low load hours.

Description

Technical Field

[0001] The invention relates to the technical field of cold storage systems, and more specifically to a central air-conditioning water cold storage combined with a phase-change ice plate cold storage system. Background Art

[0002] Energy storage is crucial as a regulatory measure for energy utilization. Thermal energy storage is a relatively cost-effective method among various energy storage methods. Water-cooled storage is one of the most commonly used thermal energy storage systems. It has the advantages of high efficiency, stability and low price, but its cold storage density is small, and it requires the design of large-volume water tanks, which occupy a large area. Nowadays, building complexes are generally large in size and have high air-conditioning energy consumption, especially during periods of high daytime temperatures, which causes a great impact on the power grid. Adding cold storage to the air-conditioning system can shift peaks and fill valleys, improve the flexibility of the power grid, have great social and economic value, save energy utilization, and reduce carbon emissions.

[0003] As an efficient way of energy utilization, cold storage not only reduces the capacity of refrigeration and power equipment, but also allows the refrigeration system to operate at full load, improving operating efficiency, promoting green and low-carbon transformation, and achieving green and low-carbon development of buildings.

[0004] Although the water-cooled air-conditioning system is efficient and practical, it only exchanges heat for sensible heat and requires a large space to store water. Especially in large cities, it is difficult to reserve a large space for water tanks, and the construction of water tanks is difficult. In addition, when switching between the cold storage and cooling states, large cold energy fluctuations will occur, and the existing system lacks the means to alleviate this fluctuation, which easily reduces the efficiency of cold storage and cooling. Summary of the invention

[0005] The present invention provides a central air-conditioning water cold storage combined with a phase-change ice plate cold storage system, which solves the technical problems in the related art of single heat exchange means and difficulty in buffering large cold energy fluctuations when switching between cold storage and cooling release states.

[0006] The present invention provides a central air-conditioning water cold storage combined with phase-change ice plate cold storage system, comprising a water tank and a phase-change material module, wherein the water tank is provided with a water inlet and a water outlet, the phase-change material modules are stacked and arranged in the water tank, and the cross section along the diameter direction of the water tank is spring-shaped, the phase-change material module is provided with a cavity for accommodating the phase-change material, the water inlet is connected with a water inlet pipe, the water outlet is connected with a water outlet pipe, a connecting pipe is connected between the water inlet pipe and the water outlet pipe, a proportional three-way valve is provided at the connection between the water outlet pipe and the connecting pipe, a water distributor is provided at the ends of the water inlet pipe and the water outlet pipe extending into the water tank, when the cold storage system is in cooling operation, the ends of the water inlet pipe and the water outlet pipe away from the water tank are connected to the cooling heat exchange plate, and when the cold storage system is in cooling operation, the ends of the water inlet pipe and the water outlet pipe away from the water tank are connected to the refrigeration host;

[0007] An adjustment module for driving the phase change material module to expand and contract along the depth direction of the water tank is arranged in the water tank. The adjustment module drives the phase change material module to expand and contract while driving the phase change material to fill the cavity of the phase change material module.

[0008] As a further solution of the present invention: the adjustment module includes a fixed ring, a movable ring, a liquid supply pipe, a storage tank, a piston, an electric push rod, a bracket, a first rack, a mounting block, a gear and a second rack. A fixed ring is fixedly arranged at the bottom end of the phase change material module, and a movable ring is fixedly arranged at the top end. The fixed ring is fixedly connected with the inner wall of the water tank, and the movable ring is slidably connected with the inner wall of the water tank. A liquid supply pipe communicated with the phase change material module is fixedly arranged at the center of the phase change material module. A storage tank is fixedly arranged above the liquid supply pipe. An electric push rod is fixedly arranged in the water tank, and a piston is fixedly installed at the output end of the electric push rod. The piston is slidably arranged in the storage tank. The storage tank is filled with a phase change material. A bracket is fixedly arranged at the output end of the electric push rod, and a first rack is fixedly installed at the end of the bracket. The mounting block is fixedly installed on the inner wall of the water tank, and a gear is rotatably installed in the mounting block. A second rack is fixedly installed at the top of the movable ring. The first rack and the second rack are respectively engaged on both sides of the gear.

[0009] As a further solution of the present invention: the water distributor is arranged in a ring shape along the inside of the water tank, and the water outlet direction of the water distributor is away from the phase change material module.

[0010] The beneficial effects of the present invention are as follows:

[0011] Pure water-cooling energy storage uses the sensible heat value of water to store cold, while the ice-cooling energy storage system uses the latent heat value of solid-state ice of water to absorb and release heat to complete energy conversion. The combination of water and phase change material in the present invention has both sensible heat exchange and latent heat exchange, meets the circulating water volume required for system operation, and efficiently completes the charging and discharging processes of latent heat value. The cooling efficiency can reach about 95%. The combination of the phase change material module for cold storage does not require a dual-condition refrigeration unit, and only a common unit can complete the latent heat exchange of the phase change material. And the combination with the water-cooling energy storage system also adjusts the cold storage and cold release working modes. The maximum peak shaving of the cold storage air-conditioning system can be achieved with a limited space area, while the operating efficiency of the unit is improved and the power consumption is reduced.

[0012] When the adjustment module in the present invention adjusts the expansion and contraction of the phase change material module, taking the expansion of the phase change material module as an example, the electric push rod is driven to press down the bracket to move. At this time, the first rack moves downward, driving the gear to rotate. On the other side of the gear, the second rack moves upward, driving the movable ring to move upward along the inner wall of the water tank, and unfolding the stacked phase change material modules, so as to increase the volume ratio of the phase change material module in the water tank to cope with the change and fluctuation of cold energy release when switching between peak hours and low-load hours.

[0013] In the present invention, when the adjustment module realizes the adjustment of the volume ratio of the phase change material module in the water tank, taking the extended phase change material module as an example, it also realizes the replenishment of the phase change material in the extended phase change material module. Specifically, the electric push rod drives the piston to move downward in the storage tank, replenishing the phase change material stored in the storage tank into the phase change material module, so that the cavity formed after the extension of the phase change material module is replenished, and the phase change material in the phase change material module remains full. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 FIG. is a schematic diagram of the cooling operation of the central air-conditioning water-cooling storage combined with phase change ice plate cooling storage system proposed by the present invention;

[0015] Figure 2 FIG. is a schematic diagram of the cold storage operation of the central air-conditioning water-cooling storage combined with phase change ice plate cooling storage system proposed by the present invention;

[0016] Figure 3 FIG. is a schematic diagram of the installation structure of the adjustment module in the central air-conditioning water-cooling storage combined with phase change ice plate cooling storage system proposed by the present invention;

[0017] Figure 4 FIG. is a schematic diagram of the unfolded structure of the adjustment module in the central air-conditioning water-cooling storage combined with phase change ice plate cooling storage system proposed by the present invention;

[0018] Figure 5 FIG. is a schematic diagram of the stacked state of the phase change material module in the central air-conditioning water-cooling storage combined with phase change ice plate cooling storage system proposed by the present invention;

[0019] Figure 6 FIG. is a schematic diagram of the detailed structure of the adjustment module in the central air-conditioning water-cooling storage combined with phase change ice plate cooling storage system proposed by the present invention.

[0020] In the figure:

[0021] 10. Water tank; 101. Water inlet; 102. Water outlet; 20. Phase change material module; 30. Water inlet pipe; 40. Water outlet pipe; 50. Connecting pipe; 60. Water distributor; 70. Proportional three-way valve; 80. Cooling heat exchange plate; 90. Refrigeration host;

[0022] 21. Adjustment module; 211. Fixed ring; 212. Movable ring; 213. Liquid replenishing pipe; 214. Storage tank; 215. Piston; 216. Electric push rod; 217. Bracket; 218. First rack; 219. Installation block; 2110. Gear; 2111. Second rack. DETAILED DESCRIPTION OF THE INVENTION

[0023] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein, and that changes can be made to the functions and arrangements of the elements discussed without departing from the scope of protection of the content of this specification. Each example can omit, substitute, or add various processes or components as needed. In addition, the features described in some examples can also be combined in other examples.

[0024] The invention discloses a central air-conditioning water-cooling storage combined with a phase-change ice plate cooling storage system, as Figure 1 - Figure 6 shown, which includes a water tank 10 and a phase change material module 20. An inlet 101 and an outlet 102 are provided on the water tank 10. The phase change material modules 20 are stacked in the water tank 10 and are in a spring shape in a cross-section along the diameter direction of the water tank 10. A cavity for accommodating the phase change material is provided in the phase change material module 20. A water inlet pipe 30 is communicated at the inlet 101, and a water outlet pipe 40 is connected at the outlet 102. A connecting pipe 50 is connected between the water inlet pipe 30 and the water outlet pipe 40. A proportional three-way valve 70 is provided at the connection between the water outlet pipe 40 and the connecting pipe 50. Water distributors 60 are provided at the ends of the water inlet pipe 30 and the water outlet pipe 40 extending into the water tank 10. When the cooling storage system is in the cooling release operation, the ends of the water inlet pipe 30 and the water outlet pipe 40 away from the water tank 10 are connected to a cooling release heat exchange plate 80. When the cooling storage system is in the cooling storage operation, the ends of the water inlet pipe 30 and the water outlet pipe 40 away from the water tank 10 are connected to a refrigeration host 90;

[0025] An adjustment module 21 for driving the phase change material module 20 to expand and contract in the depth direction of the water tank 10 is provided in the water tank 10. The adjustment module 21 drives the phase change material module 20 to expand and contract and at the same time drives the phase change material to fill the cavity in the phase change material module 20.

[0026] The invention has both the functions of cooling storage and cooling release. During low-load periods (such as at night or off-peak hours), the refrigeration host 90 is connected, and through the circulating flow of water, as Figure 2 the flow direction indicated by the arrow in, the water and the phase change material module 20 are cooled to a low temperature, and the cold energy is stored by using the latent heat of phase change. The water tank 10 is responsible for receiving the cold water cooled by the refrigeration host 90 to achieve large-capacity cold energy storage. At this time, the phase change material stores cold energy by solidification to achieve high-density cold energy storage.

[0027] During peak demand periods (such as during the day or high-temperature periods), when releasing cold energy and operating as a cooling release system, as Figure 1As shown, the arrow in the figure indicates the water flow direction. At this time, the phase change material releases latent heat through the melting process. The cold water is transported from the water outlet 102 to the cold-release heat exchange plate 80 through the water outlet pipe 40, and after passing through the cold-release heat exchange plate 80, it flows back to the water tank 10 through the water inlet pipe 30. During the return journey, the water pressure is supplemented to the water outlet pipe 40 through the connecting pipe 50. That is, the water exchanges heat with the cooling coil of the air-conditioning system or the air handling equipment through the cold-release heat exchange plate 80, and the phase change material gradually releases cold energy, and the entire cold water flow system provides sufficient low-temperature water source for the air conditioner.

[0028] In actual setting, the phase change material module 20 is directly stacked at the middle position in the water tank 10. Since there are water distributors 60 and pipelines at the upper and lower parts of the tank body, the distance between the phase change module and the bottom is controlled to be about 1 - 1.2 m. Polymer universal support pillars are used, and I-beams or square tubes are set on the supports. The phase change module layers are evenly arranged above, and at the same time, the position of the water flow channel is considered, which not only satisfies the uniformity and stability of the water flow pattern, but also ensures sufficient heat exchange between the water and the phase change module plate. The stacking height is controlled within 1 / 3 of the total water body height, and the overall height is controlled at about 1.5 m.

[0029] During actual use, by adjusting the volume ratio of the phase change material module 20 in the water tank 10, the change fluctuations during the switching between peak hours and low load hours can be effectively alleviated. Specifically, by adjusting the module 21 to drive the phase change material module 20 to expand and contract while driving the phase change material to fill the cavity of the phase change material module 20, the volume ratio of the phase change material module 20 in the water tank 10 can be adjusted.

[0030] The adjustment module 21 includes a fixed ring 211, a movable ring 212, a liquid supply pipe 213, a storage tank 214, a piston 215, an electric push rod 216, a bracket 217, a first rack 218, a mounting block 219, a gear 2110, and a second rack 2111. The bottom end of the phase change material module 20 is fixedly provided with the fixed ring 211, and the top end is fixedly provided with the movable ring 212. The fixed ring 211 is fixedly connected to the inner wall of the water tank 10, and the movable ring 212 is slidably connected to the inner wall of the water tank 10. A liquid supply pipe 213 communicating with the phase change material module 20 is fixedly provided at the center of the phase change material module 20. A storage tank 214 is fixedly provided above the liquid supply pipe 213. An electric push rod 216 is fixedly provided in the water tank 10. The output end of the electric push rod 216 is fixedly installed with the piston 215. The piston 215 is slidably arranged in the storage tank 214. The storage tank 214 is filled with a phase change material. A bracket 217 is fixedly provided at the output end of the electric push rod 216. The end of the bracket 217 is fixedly installed with the first rack 218. The inner wall of the water tank 10 is fixedly installed with the mounting block 219. A gear 2110 is rotatably installed in the mounting block 219. The second rack 2111 is fixedly installed at the top of the movable ring 212. The first rack 218 and the second rack 2111 are respectively engaged on both sides of the gear 2110.

[0031] When the adjustment module 21 adjusts the phase change material module 20 in a telescopic manner, taking the extension of the phase change material module 20 as an example, the electric push rod 216 is driven to press down the bracket 217 to move. At this time, the first rack 218 moves downward, driving the gear 2110 to rotate. On the other side of the gear 2110, the second rack 2111 moves upward, driving the movable ring 212 to move upward along the inner wall of the water tank 10, and unfolding the stacked phase change material module 20, so as to increase the volume ratio of the phase change material module 20 in the water tank 10 to cope with the change in cold energy release during the switching between peak hours and low load hours.

[0032] When the adjustment module 21 realizes the adjustment of the volume ratio of the phase change material module 20 in the water tank 10, still taking the extension of the phase change material module 20 as an example, it also realizes the replenishment of the phase change material in the extended phase change material module 20. Specifically, the electric push rod 216 drives the piston 215 to move downward in the storage tank 214, and replenishes the phase change material stored in the storage tank 214 into the phase change material module 20, so as to supplement the cavity that appears after the extension of the phase change material module 20 and keep the phase change material in the phase change material module 20 full. The phase change material is selected as a material that changes between solid and liquid states with temperature, such as paraffin.

[0033] The water distributor 60 is arranged in a ring shape along the inside of the water tank 10, and the water outlet direction of the water distributor 60 is away from the phase change material module 20.

[0034] While ensuring smooth water flow, it avoids the direct impact of the water flow on the phase change material module 20.

[0035] The above embodiments of the present invention have been described, but the present embodiment is not limited to the above specific implementation manners. The above specific implementation manners are merely illustrative and not restrictive. Under the inspiration of the present embodiment, those of ordinary skill in the art can also make more equivalent embodiments in various forms, all of which fall within the protection scope of the present embodiment.

Claims

1. Central air-conditioning water-cool storage combined with phase change ice plate cold storage system, characterized in that, It includes a water tank (10) and a phase change material module (20). An inlet (101) and an outlet (102) are provided on the water tank (10). The phase change material modules (20) are stacked in the water tank (10), and the cross-section along the diameter direction of the water tank (10) is spring-shaped. A cavity for accommodating the phase change material is provided in the phase change material module (20). A water inlet pipe (30) is connected to the inlet (101), and a water outlet pipe (40) is connected to the outlet (102). A connecting pipe (50) is connected between the water inlet pipe (30) and the water outlet pipe (40). A proportional three-way valve (70) is provided at the connection between the water outlet pipe (40) and the connecting pipe (50). Water distributors (60) are provided at the ends of the water inlet pipe (30) and the water outlet pipe (40) extending into the water tank (10). When the cold storage system is discharging cold, the ends of the water inlet pipe (30) and the water outlet pipe (40) far from the water tank (10) are connected to a cold discharge heat exchange plate (80). When the cold storage system is storing cold, the ends of the water inlet pipe (30) and the water outlet pipe (40) far from the water tank (10) are connected to a refrigeration host (90); An adjustment module (21) for driving the phase change material module (20) to expand and contract in the depth direction of the water tank (10) is provided in the water tank (10). The adjustment module (21) drives the phase change material module (20) to expand and contract while driving the phase change material to fill the cavity of the phase change material module (20), so as to alleviate the fluctuation of cold energy release change during the switching between peak hours and low load hours; The adjustment module (21) includes a fixed ring (211), a movable ring (212), a liquid replenishing pipe (213), a storage tank (214), a piston (215), an electric push rod (216), a bracket (217), a first rack (218), a mounting block (219), a gear (2110), and a second rack (2111). A fixed ring (211) is fixedly arranged at the bottom end of the phase change material module (20), and a movable ring (212) is fixedly arranged at the top end. The fixed ring (211) is fixedly connected to the inner wall of the water tank (10), and the movable ring (212) is slidably connected to the inner wall of the water tank (10). A liquid replenishing pipe (213) communicating with the phase change material module (20) is fixedly arranged at the center of the phase change material module (20). A storage tank (214) is fixedly arranged above the liquid replenishing pipe (213). An electric push rod (216) is fixedly arranged in the water tank (10), and a piston (215) is fixedly installed at the output end of the electric push rod (216). The piston (215) is slidably arranged in the storage tank (214). The storage tank (214) is filled with a phase change material. A bracket (217) is fixedly arranged at the output end of the electric push rod (216), and a first rack (218) is fixedly installed at the end of the bracket (217). A mounting block (219) is fixedly installed on the inner wall of the water tank (10), and a gear (2110) is rotatably installed in the mounting block (219). A second rack (2111) is fixedly installed at the top of the movable ring (212). The first rack (218) and the second rack (2111) are respectively engaged on both sides of the gear (2110).

2. The central air-conditioning water-cooled energy storage combined with phase change ice slab energy storage system according to claim 1, wherein The water distributor (60) is arranged in a ring shape inside the water tank (10), and the water outlet direction of the water distributor (60) is away from the phase change material module (20).

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