Central air-conditioning chilled water storage and phase change ice plate cold storage combined system

Abstract

The invention relates to the technical field of cold storage systems, and discloses a central air conditioner chilled water storage and phase change ice plate combined cold storage system which comprises a water tank and phase change material modules, the phase change material modules are stacked in the water tank, the section of each phase change material module in the diameter direction of the water tank is in a spring shape, and a cavity for containing a phase change material is formed in each phase change material module. An adjusting module for driving the phase-change material module to stretch out and draw back in the depth direction of the water tank is arranged in the water tank, the adjusting module drives the phase-change material module to stretch out and draw back and meanwhile drives the phase-change material to be filled in a cavity of the phase-change material module, and when the adjusting module conducts stretching adjustment on the phase-change material module, an electric push rod is driven to press a support to move. At the moment, the first rack moves downwards, the driving gear rotates, the second rack moves upwards on the other side of the gear, the movable ring is driven to move upwards along the inner wall of the water tank, the stacked phase-change material modules are unfolded, the volume ratio of the phase-change material modules in the water tank is increased, and cold energy release change fluctuation during switching of the peak period and the low-load period is coped.

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; The water tank is provided with an adjustment module for driving the phase change material module to expand and contract along the depth direction of the water tank. The adjustment module drives the phase change material module to expand and contract and drives the phase change material to fill the cavity of the phase change material module.

[0007] As a further solution of the present invention: the adjustment module includes a fixed ring, a movable ring, a fluid infusion tube, a storage tank, a piston, an electric push rod, a bracket, a first rack, a mounting block, a gear and a second rack. The bottom end of the phase change material module is fixedly provided with a fixed ring, and the top end is fixedly provided with a movable ring. The fixed ring is fixedly connected to the inner wall of the water tank, and the movable ring is slidably connected to the inner wall of the water tank. A fluid infusion tube connected to the phase change material module is fixed at the center of the phase change material module, a storage tank is fixed above the fluid infusion tube, an electric push rod is fixedly provided in the water tank, a piston is fixedly provided at the output end of the electric push rod, and the piston is slidably provided in the storage tank. The storage tank is filled with phase change material, and a bracket is fixedly provided on the output end of the electric push rod, a first rack is fixedly provided on the end of the bracket, a mounting block is fixedly provided on the inner wall of the water tank, a gear is rotatably provided in the mounting block, a second rack is fixedly provided on the top of the movable ring, and the first rack and the second rack are respectively meshed on both sides of the gear.

[0008] 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.

[0009] The beneficial effects of the present invention are: Simple water storage uses the sensible calorific value of water to store cold, while the ice storage system uses the latent heat value of ice in the solid state of water to absorb and release heat to complete energy conversion. The present invention combines water and phase change materials to exchange both sensible heat and latent heat, which can meet the circulating water volume of the system operation and efficiently complete the latent heat charge and discharge process. The cooling efficiency can reach about 95%. Combined with the phase change material module for cold storage, there is no need to use a dual-mode refrigeration unit, and only a common unit can be used to complete the latent heat exchange of the phase change material. And combined with the water storage system, the storage and release working modes are also adjusted. The maximum peak shaving of the cold storage air-conditioning system can be achieved by utilizing a limited space area, while the operating efficiency of the unit is improved and the power consumption is reduced.

[0010] When the adjustment module in the present invention performs telescopic adjustment on the phase change material module, taking the extended phase change material module as an example, the electric push rod is driven to press the bracket down to move. At this time, the first rack moves down to drive the gear to rotate. On the other side of the gear, the second rack moves up, driving the movable ring to move up along the inner wall of the water tank, and the stacked phase change material modules are unfolded, thereby increasing the volume ratio of the phase change material module in the water tank to cope with the fluctuations in cold energy release when switching between peak hours and low load hours.

[0011] When the adjustment module in the present invention adjusts the volume ratio of the phase change material module in the water tank, it still takes the extended phase change material module as an example, and also simultaneously 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, and replenishes the phase change material stored in the storage tank into the phase change material module, so that the cavity appearing after the phase change material module is extended is replenished, thereby keeping the phase change material in the phase change material module full. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of cooling operation of the central air-conditioning water storage combined with phase change ice plate storage system proposed by the present invention; Figure 2 It is a schematic diagram of the cold storage operation of the central air-conditioning water cold storage combined with the phase change ice plate cold storage system proposed by the present invention; Figure 3 It is a schematic diagram of the installation structure of the regulating module in the central air-conditioning water storage combined with phase-change ice plate storage system proposed by the present invention; Figure 4 It is a schematic diagram of the expanded structure of the regulating module in the central air-conditioning water cold storage combined with phase-change ice plate cold storage system proposed by the present invention; Figure 5 It is a schematic diagram of the stacking state of phase change material modules in the central air-conditioning water cold storage combined with phase change ice plate cold storage system proposed by the present invention; Figure 6 It is a detailed structural diagram of the regulating module in the central air-conditioning water storage combined with phase change ice plate storage system proposed by the present invention.

[0013] In the figure: 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; 21. Adjustment module; 211. Fixed ring; 212. Movable ring; 213. Infusion tube; 214. Storage tank; 215. Piston; 216. Electric push rod; 217. Bracket; 218. First rack; 219. Mounting block; 2110. Gear; 2111. Second rack. DETAILED DESCRIPTION

[0014] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that the discussion of these implementations is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Various examples may omit, replace, or add various processes or components as needed. In addition, the features described in some examples may also be combined in other examples.

[0015] The present invention discloses a central air conditioning water storage combined with phase change ice plate storage system, such as Figure 1 - Figure 6 As shown, it includes a water tank 10 and a phase change material module 20, the water tank 10 is provided with a water inlet 101 and a water outlet 102, the phase change material module 20 is stacked and arranged in the water tank 10, and the cross section along the diameter direction of the water tank 10 is spring-shaped, the phase change material module 20 is provided with a cavity for accommodating the phase change material, the water inlet 101 is connected to a water inlet pipe 30, the water outlet 102 is connected to a water outlet pipe 40, the water inlet pipe 30 and the water outlet pipe 40 are connected, and the water inlet pipe 30 and the water outlet pipe 40 are connected. A connecting pipe 50 is connected between the water outlet pipe 40 and the connecting pipe 50, and a proportional three-way valve 70 is provided at the connection between the water inlet pipe 30 and the water outlet pipe 40, and a water distributor 60 is provided on 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 in cooling operation, the ends of the water inlet pipe 30 and the water outlet pipe 40 away from the water tank 10 are connected to the cooling heat exchange plate 80. When the cold storage system is in cold 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 the refrigeration host 90; The water tank 10 is provided with an adjustment module 21 for driving the phase change material module 20 to expand and contract along the depth direction of 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 .

[0016] The present invention has both cold storage and cooling functions. During low-load periods (such as nighttime or off-peak hours), the refrigeration host 90 is connected, and the water circulates, such as Figure 2 The flow direction indicated by the middle arrow cools the water and the phase change material module 20 to a low temperature, and the cold energy is stored by utilizing the latent heat of phase change. The water tank 10 is responsible for receiving the cold water after the cooling of the refrigeration host 90 to realize large-capacity cold energy storage. At this time, the phase change material stores cold energy by solidification to realize high-density cold energy storage.

[0017] Release cold energy during peak demand periods (such as daytime or high temperature periods) and operate as a cooling system. Figure 1 As shown, the arrow in the figure indicates the direction of water flow. At this time, the phase change material releases latent heat through the melting process, and the cold water is transported from the water outlet 102 to the cooling heat exchange plate 80 through the water outlet pipe 40. After passing through the cooling heat exchange plate 80, it flows back to the water tank 10 through the water inlet pipe 30, and replenishes the water pressure to the water outlet pipe 40 through the connecting pipe 50 on the way back. That is, the water exchanges heat with the cooling coil or air handling equipment of the air-conditioning system through the cooling 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.

[0018] In actual setting, the phase change material module 20 is directly stacked in the middle position of the water tank 10. Due to the presence of a water distributor 60 and pipelines in the upper and lower parts of the tank body, the distance between the phase change module and the bottom is controlled to be about 1-1.2m. A polymer universal support pillar is used, and an I-beam or square tube is set on the support. The phase change module layer is evenly arranged on the top. At the same time, the position of the water flow channel is considered to meet the uniformity and stability of the water flow state and ensure 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 1.5m.

[0019] In actual use, by adjusting the volume ratio of the phase change material module 20 in the water tank 10, the fluctuations during switching between peak hours and low load periods can be effectively alleviated. Specifically, 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, thereby achieving the volume ratio adjustment of the phase change material module 20 in the water tank 10.

[0020] The regulating module 21 includes a fixed ring 211, a movable ring 212, a liquid infusion tube 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 a fixed ring 211, and the top end is fixedly provided with a 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 infusion tube 213 connected to the phase change material module 20 is fixed at the center, and a storage tank 214 is fixed above the liquid infusion tube 213. The water tank 10 An electric push rod 216 is fixedly installed in the middle, and a piston 215 is fixedly installed at the output end of the electric push rod 216. The piston 215 is slidably set in the storage tank 214, and the storage tank 214 is filled with phase change material. A bracket 217 is fixedly installed on 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 on the top of the movable ring 212, and the first rack 218 and the second rack 2111 are respectively meshed on both sides of the gear 2110.

[0021] When the adjustment module 21 performs telescopic adjustment on the phase change material module 20, taking the extension of the phase change material module 20 as an example, the electric push rod 216 is driven to press the bracket 217 to move. At this time, the first rack 218 moves down and drives the gear 2110 to rotate. On the other side of the gear 2110, the second rack 2111 moves up, driving the movable ring 212 to move up along the inner wall of the water tank 10, and unfolding the stacked phase change material modules 20, thereby increasing the volume ratio of the phase change material module 20 in the water tank 10 to cope with the fluctuations in cold energy release when switching between peak hours and low load hours.

[0022] When the adjustment module 21 adjusts the volume ratio of the phase change material module 20 in the water tank 10, it still takes the extended phase change material module 20 as an example, and also simultaneously 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 that the cavity appearing after the phase change material module 20 is extended is replenished, and the phase change material in the phase change material module 20 is kept full. The phase change material is selected from a material that changes between solid and liquid states with temperature, such as paraffin.

[0023] 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 .

[0024] While ensuring smooth water flow, direct impact of water flow on the phase change material module 20 is avoided.

[0025] The above describes an embodiment of the present invention, but this embodiment is not limited to the above-mentioned specific implementation mode. The above-mentioned specific implementation mode is merely illustrative and not restrictive. Under the guidance of this embodiment, ordinary technicians in this field can also make more forms of equivalent embodiments, all of which are within the protection of this embodiment.

Claims

1. Central air conditioning water storage combined with phase change ice plate storage system, characterized in that: The invention comprises a water tank (10) and a phase change material module (20), wherein the water tank (10) is provided with a water inlet (101) and a water outlet (102), the phase change material modules (20) are stacked and arranged in the water tank (10), and a cross section along the diameter direction of the water tank (10) is in a spring shape, the phase change material module (20) is provided with a cavity for accommodating phase change material, the water inlet (101) is connected to a water inlet pipe (30), the water outlet (102) is connected to a water outlet pipe (40), and the water inlet pipe (30) and the water outlet pipe (40) are connected to each other. A connecting pipe (50) is connected, a proportional three-way valve (70) is provided at the connection between the water outlet pipe (40) and the connecting pipe (50), and a water distributor (60) is provided on 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 in cooling operation, the ends of the water inlet pipe (30) and the water outlet pipe (40) away from the water tank (10) are connected to the cooling heat exchange plate (80), and when the cold storage system is in cold 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 the refrigeration host (90); The water tank (10) is provided with an adjustment module (21) for driving the phase change material module (20) to expand and contract along the depth direction of 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).

2. The central air conditioning water storage combined with phase change ice plate storage system according to claim 1 is characterized in that: The regulating module (21) comprises a fixed ring (211), a movable ring (212), a liquid infusion tube (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 provided at the bottom end of the phase change material module (20), and a movable ring (212) is fixedly provided at the top end; the fixed ring (211) is fixedly connected to the inner wall of the water tank (10); the movable ring (212) is slidably connected to the inner wall of the water tank (10); a liquid infusion tube (213) connected to the phase change material module (20) is fixed at the center thereof; a storage tank (214) is fixedly provided above the liquid infusion tube (213); An electric push rod (216) is fixedly arranged in the tank (10), 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 phase change material, a bracket (217) is fixedly arranged on the output end of the electric push rod (216), 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), a gear (2110) is rotatably installed in the mounting block (219), a second rack (2111) is fixedly installed on the top of the movable ring (212), and the first rack (218) and the second rack (2111) are respectively meshed on both sides of the gear (2110).

3. The central air conditioning water storage combined with phase change ice plate storage system according to claim 1 is characterized in that: The water distributor (60) is arranged in a ring shape along the interior of 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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