Pipe structure and layout design method of water storage system

Abstract

This invention belongs to the field of fire protection and cold storage technology, and discloses a pipeline structure and layout design method for a water-based cold storage system. Addressing the problems existing in the prior art, a second water supply pipeline with a Π-shaped structure is installed in the pipeline between the lower water distributor and the refrigeration unit. As the liquid level in the cold storage tank continuously decreases, the height difference between the Π-shaped second water supply pipeline and the water level in the cold storage tank continuously increases. When the water level in the cold storage tank drops to near the fire-fighting water level, the height difference between the second water supply pipeline and the fire-fighting water level will prevent the water pump of the refrigeration unit from continuing to draw water from the cold storage tank, thus keeping the fire-fighting water level unchanged. Furthermore, the pipeline layout design method of this application differs from the traditional technical solution of opening small holes or vacuum breaking holes in the outlet pipe, avoiding the disturbance of the thermocline layer of the cold storage system by overflow from the small holes, and ensuring the cold storage capacity and effect of the cold storage tank.

Description

Technical Field

[0001] This invention belongs to the field of fire protection and cold storage technology, specifically relating to a pipeline structure and layout design method for a water cold storage system. Background Technology

[0002] Water-based chilled air conditioning, as an economical and energy-saving air conditioning technology, has been widely used in the building industry. Water-based chilled air conditioning systems utilize off-peak electricity prices at night or during off-peak hours to provide cooling, storing the cooling capacity in water and releasing it during peak daytime electricity consumption, thereby achieving energy conservation and emission reduction. Fire water tanks are artificially constructed water storage measures for fixed or mobile fire pumps to draw water.

[0003] Currently, cold storage water tanks and fire-fighting water tanks are designed and used separately. When fire-fighting water is combined with production and domestic water, reliable technical facilities (such as having the outlet pipes for production and domestic water located above the fire-fighting water level) are required to prevent the fire-fighting water from being used for other purposes in order to prevent it from being diverted to production and domestic water use.

[0004] In existing technologies, to ensure that the fire-fighting water in the combined water storage tank is not used, small holes or vacuum rupture holes are generally made in the outlet pipe. The actual cooling capacity and effect of a water-based cold storage device largely depend on the temperature mixing loss within the storage tank. Temperature-stratified water-based cold storage devices have two water distributors in the storage tank that evenly distribute water flow. To achieve natural stratification, hot water should always flow in or out of the upper distributor, while cold water should flow in or out of the lower distributor. The goal is to create and maintain a uniform, piston-like movement of water at different temperatures, thus forming and maintaining a stable temperature gradient layer (i.e., a temperature gradient layer) between the upper hot zone and the lower cold zone, preventing the mixing of the lower cold water with the upper hot water. For cold storage and fire-fighting water tanks, this method of using small holes or vacuum rupture holes can cause overflow near the holes due to the flow within the pipes, affecting the stability of the temperature gradient layer and thus reducing the cooling capacity and effect of the storage tank. Summary of the Invention

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this invention is to provide a piping structure for a water-cooled storage system, which aims to solve the problems existing in the prior art.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A piping structure for a water-based cold storage system includes a cold storage tank, a refrigeration unit, a water distribution device, and a circulation piping system. The water distribution device is located within the cold storage tank and is connected to the refrigeration unit through the circulation piping system.

[0008] The water distribution device includes an upper water distributor and a lower water distributor, with the upper water distributor positioned above the lower water distributor.

[0009] The circulating pipeline system includes a water supply pipeline, a return pipeline and a bypass pipeline. The water supply pipeline is connected to the lower water distributor and the refrigeration unit respectively, and the return pipeline is connected to the upper water distributor.

[0010] The water supply pipeline includes a first water supply pipeline, a second water supply pipeline, and a third water supply pipeline. The second water supply pipeline is connected to the first water supply pipeline and the third water supply pipeline respectively. The first water supply pipeline is connected to the lower water distributor, and the third water supply pipeline is connected to the refrigeration device. The second water supply pipeline has a Π-shaped structure.

[0011] The cold water storage tank is equipped with a fire-fighting water level, and the second water supply pipeline is located above the fire-fighting water level.

[0012] Preferably, both the upper and lower water distributors include a plurality of water outlets, which are evenly distributed along the length of the upper and lower water distributors.

[0013] Preferably, the refrigeration device includes a refrigeration unit, a cooling tower, and a water pump. The cooling tower is connected to the refrigeration unit, and the water pump is connected to the third water supply pipeline and the refrigeration unit, respectively.

[0014] This application also includes a method for designing the layout of a piping structure for a water-cooled storage system, which employs the piping structure of the water-cooled storage system described above and includes the following steps:

[0015] S1. When the water level in the cold storage tank drops to the fire water level, the Bernoulli equation is used to calculate the relative relationship between the head loss and the water flow velocity in the pipeline of the circulation pipeline system, taking the inlet section of the water pump of the refrigeration unit as the reference plane.

[0016] S2. Calculate the head loss and, based on the head loss, calculate the water flow velocity in the pipeline of the circulation pipeline system;

[0017] S3. Based on the above water flow velocity, Bernoulli's equation is used to calculate the maximum vacuum height value under normal water flow conditions in the second water supply pipeline in the area between the top section of the second water supply pipeline and the water surface of the cold water storage tank.

[0018] S4. Substitute the allowable suction vacuum height parameter of the water pump of the refrigeration unit into the calculation formula of the maximum vacuum height value mentioned above to form a height setting condition for limiting the situation where the water level in the cold storage water tank drops to the fire water level and no longer continues to drop. This height setting condition is used to limit the design height between the second water supply pipeline and the fire water level of the cold storage water tank.

[0019] Preferably, in step S1, the installation height of the water pump of the refrigeration unit is determined. The permissible suction vacuum height of the water pump Fire water level height of the cold storage tank The diameter of each pipe in the circulation pipeline system ;

[0020] Bernoulli's equation for the region between the inlet section of the water pump in the refrigeration unit and the water surface of the cold storage tank is:

[0021] Equation (a);

[0022] in, Atmospheric pressure The pressure at the inlet section of the water pump. For the density of water, It is the acceleration due to gravity. This is the kinetic energy correction factor. For head loss, This refers to the water flow velocity within the pipes of a circulating pipeline system.

[0023] Preferably, in step S2, the head loss Including friction loss and local resistance loss ;

[0024] Among them, friction loss The calculation formula is as follows:

[0025] , This is the friction coefficient. The length of the pipeline between the inlet section of the water pump of the refrigeration unit and the lower water distributor;

[0026] Local resistance loss The calculation formula is as follows:

[0027] , The local resistance coefficient is the section of pipe between the inlet section of the water pump and the lower water distributor of the refrigeration unit.

[0028] Based on the above calculation formula, we can conclude that:

[0029] Equation (b);

[0030] Based on equations (a) and (b), we can further derive:

[0031] Formula (c);

[0032] In the above formula, the vacuum height at the inlet section of the water pump of the refrigeration unit is defined as... ,

[0033] Based on equation (c), the formula for calculating the water flow velocity in the pipes of a circulating pipeline system is as follows:

[0034] Formula (d).

[0035] Preferably, in step S3, the Bernoulli equation calculated in the region between the top cross-section of the second water supply pipeline and the water surface of the cold water storage tank is:

[0036] , Equation (e);

[0037] in, This refers to the length of the pipe section between the top cross-section of the second water supply pipe and the lower water distributor. The local resistance coefficient between the top section of the second water supply pipeline and the section between the lower water distributor is given. The pressure at the top of the second water supply pipeline;

[0038] Furthermore, based on equation (e), we can derive:

[0039] Equation (f), where z c Z1 is the height of the top of the second water supply pipeline relative to the inlet section of the water pump of the refrigeration unit, and Z2 is the height of the fire water level relative to the inlet section of the water pump of the refrigeration unit.

[0040] Based on equations (f) and (c), we can derive:

[0041] Formula (g);

[0042] Based on equation (g), the formula for calculating the maximum vacuum height under normal water flow conditions in the second water supply pipeline is derived:

[0043] , formula (h).

[0044] Preferably, in step S4, the allowable suction vacuum height parameter of the water pump of the refrigeration unit is set to... ,Will Substitute into expression (h) and replace The height setting condition Δh is obtained. min :

[0045] .

[0046] Compared with the prior art, the beneficial effects of the present invention include:

[0047] This application addresses the problems existing in the prior art by installing a second water supply pipe with a Π-shaped structure in the pipeline between the lower water distributor and the refrigeration unit. As the liquid level in the cold storage tank continuously decreases, the height difference between the Π-shaped second water supply pipe and the water level in the cold storage tank continuously increases. When the water level in the cold storage tank drops to near the fire-fighting water level, the height difference between the second water supply pipe and the fire-fighting water level will prevent the water pump of the refrigeration unit from continuing to draw water from the cold storage tank, thus keeping the fire-fighting water level unchanged. Furthermore, the pipeline layout design method of this application's water-based cold storage system differs from the traditional technical solution of opening small holes or vacuum breaking holes in the outlet pipe, avoiding the disturbance of the thermocline layer of the cold storage system by overflow from the small holes, and ensuring the cold storage capacity and effect of the cold storage tank. Attached Figure Description

[0048] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0050] Figure 2 This is a schematic diagram of the present invention in cold storage mode.

[0051] Figure 3 This is a schematic diagram of the present invention in the cooling condition.

[0052] Figure 4 This is a schematic diagram of the pipeline layout structure of the present invention.

[0053] in:

[0054] 1-Cold water storage tank, 2-Upper water distributor, 3-Lower water distributor, 4-First water supply pipeline, 5-Second water supply pipeline, 6-Third water supply pipeline, 7-Return water pipeline, 8-Refrigeration unit, 9-Cooling tower, 10-Water pump. Detailed Implementation

[0055] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. Many specific details are set forth in the following description to provide a thorough understanding of the present invention; the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0057] Example:

[0058] See Figures 1-4 A pipeline structure for a water-based cold storage system includes a cold storage tank 1, a refrigeration unit, a water distribution device, and a circulation pipeline system. The water distribution device is located inside the cold storage tank 1 and is connected to the refrigeration unit through the circulation pipeline system.

[0059] The water distribution device includes an upper water distributor 2 and a lower water distributor 3, with the upper water distributor 2 positioned above the lower water distributor 3.

[0060] The circulating pipeline system includes a water supply pipeline, a return water pipeline 7 and a bypass pipeline. The water supply pipeline is connected to the lower water distributor 3 and the refrigeration unit respectively, and the return water pipeline 7 is connected to the upper water distributor 2.

[0061] The water supply pipeline includes a first water supply pipeline 4, a second water supply pipeline 5 and a third water supply pipeline 6. The second water supply pipeline 5 is connected to the first water supply pipeline 4 and the third water supply pipeline 6 respectively. The first water supply pipeline 4 is connected to the lower water distributor 3. The third water supply pipeline 6 is connected to the refrigeration unit. The second water supply pipeline 5 has a Π-shaped structure.

[0062] The cold water storage tank 1 is equipped with a fire water level, and the second water supply pipeline 5 is located above the fire water level.

[0063] Specifically, both the upper water distributor 2 and the lower water distributor 3 include several water outlets, which are evenly distributed along the length of the upper water distributor 2 and the lower water distributor 3. In this embodiment, the Reynolds number of the water inlet at the water outlet is set to 240 to 850, and the water flow rate at the water outlet is set to less than 0.03 m / s.

[0064] Specifically, the refrigeration unit includes a refrigeration unit 8, a cooling tower 9, and a water pump 10. The cooling tower 9 is connected to the refrigeration unit 8, and the water pump 10 is connected to the third water supply pipeline 6 and the refrigeration unit 8 respectively.

[0065] In the above structure, the water distribution device can make the water flow smoothly into or out of the cold storage water tank 1, minimize water disturbance, reduce the thickness of the thermocline, and increase the effective cold storage volume.

[0066] The circulating pipeline system can realize the circulation of chilled water in the system, transport the chilled water produced by the refrigeration equipment to the chilled water storage tank 1, and transport the chilled water in the chilled water storage tank 1 to terminal equipment such as the air conditioning system during the release of cold.

[0067] The water supply pipeline extends from the refrigeration unit or chilled water storage tank 1, delivering chilled water to areas or equipment requiring cooling, such as air conditioning units and fan coil units. The pipe diameter must be selected based on the system's flow rate and velocity requirements to ensure that the chilled water can reach the terminal equipment smoothly. Insulation measures for the pipelines must also be considered to minimize cooling loss.

[0068] Return water pipe 7: Returns the hot water after heat exchange at the terminal equipment to the refrigeration unit or cold water storage tank 1. The diameter of the return water pipe 7 must also meet the flow rate and velocity requirements and must be compatible with the supply water pipe. Temperature sensors, pressure sensors, and other monitoring devices are usually installed on the return water pipe 7 to monitor the temperature, pressure, and other parameters of the return water in real time.

[0069] Bypass piping: Primarily used to adjust flow rate and pressure or switch between different operating modes during system operation according to actual needs. For example, by installing a bypass pipe at the inlet or outlet of the refrigeration unit, when the system load is low, some chilled water can be directly returned to the inlet of the refrigeration unit or the chilled water storage tank 1 through the bypass pipe, avoiding frequent start-ups and shutdowns or low-load operation of the refrigeration equipment, and improving the system's operating efficiency and stability.

[0070] The aforementioned thermocline is a horizontal temperature gradient region formed in a water-based cold storage system due to temperature differences. Located between cold and hot water, it is a transitional layer with a rapid temperature change. Formation principle: During the cold storage process, cold water enters the bottom of the cold storage tank 1 through pipes and gradually diffuses upwards, creating a temperature difference with the existing warm water in tank 1. Due to the limited thermal conductivity of water, this temperature difference gradually increases vertically, forming the thermocline. Impact on cold storage efficiency: The presence of the thermocline reduces the effective cold storage volume of the cold storage tank 1, thus lowering the cold storage efficiency. This is because the thermocline occupies space, reducing the available cold water capacity for cold storage.

[0071] Impact on system operational stability: In the later stage of cold storage, the inclined thermosphere rises to the upper part of the pool, causing the water temperature near the chiller to gradually decrease, which may lead to chiller load reduction or even premature shutdown; in the later stage of cold extraction, the inclined thermosphere descends to the bottom of the pool and enters the cold water inlet, causing the cold water temperature to rise, affecting the user's water temperature, and thus affecting the stability of system operation.

[0072] Based on the above structure, the working principle of this embodiment is as follows:

[0073] Cold water storage mode: Cold water flows in from the lower distributor 3 and hot water flows out from the upper distributor 2. The upper distributor 2 is generally located above the fire water level, so the water level in the cold water storage tank 1 will not drop below the fire water level during cold storage.

[0074] Cooling operation: Cold water flows out from the lower distributor 3, and hot water flows in from the upper distributor 2. In this situation, if there is a leak or other problem with the external piping, the water level in the cold water storage tank 1 will continuously drop as the water pump 10 continuously draws cold water out of the tank. To ensure the fire water level remains constant, the second water supply pipe 5 is connected in series with the first water supply pipe 4 and the third water supply pipe 6, with the same pipe diameter as the pipe connected to the lower distributor 3. As the water level in the cold water storage tank 1 continues to drop, the height difference between the second water supply pipe 5 and the fire water level continuously increases. When the water level in the cold water storage tank 1 drops to near the fire water level, the height difference between the second water supply pipe 5 and the fire water level will prevent the water pump 10 from continuing to draw water from the tank.

[0075] Therefore, the structure of this embodiment differs from the traditional technical solution of opening small holes or vacuum breaking holes on the water outlet pipe. It can avoid the disturbance of the inclined temperature layer of the cold storage system by the overflow of small holes in the prior art, control the formation of the inclined temperature layer within a small range, and ensure the cold storage capacity and cold storage effect of the cold storage water tank 1.

[0076] This embodiment also includes a method for designing the piping structure of a water-cooled storage system, which, using the above-mentioned piping structure of the water-cooled storage system, includes the following steps:

[0077] S1. When the water level in the cold storage tank 1 drops to the fire water level, the Bernoulli equation is calculated in the area between the inlet section of the water pump 10 of the refrigeration unit and the water surface of the cold storage tank 1, taking the inlet section of the water pump 10 of the refrigeration unit as the reference plane, to determine the relative relationship between the head loss and the water flow velocity in the pipeline of the circulation pipeline system.

[0078] S2. Calculate the head loss and, based on the head loss, calculate the water flow velocity in the pipeline of the circulation pipeline system;

[0079] S3. Based on the above water flow velocity, Bernoulli's equation is used to calculate the maximum vacuum height value in the area between the top section of the second water supply pipeline 5 and the water surface of the cold water storage tank 1, and the calculation formula for the maximum vacuum height value under normal water flow conditions in the second water supply pipeline 5 is obtained.

[0080] S4. Substitute the allowable suction vacuum height parameter of the water pump 10 of the refrigeration unit into the calculation formula of the maximum vacuum height value mentioned above to form a height setting condition for limiting the situation where the water level in the cold storage water tank 1 drops to the fire water level and no longer continues to drop. This height setting condition is used to limit the design height between the second water supply pipeline 5 and the fire water level of the cold storage water tank 1.

[0081] Specifically, in step S1, the installation height of the water pump 10 of the refrigeration unit is determined. The allowable suction vacuum height of water pump 10 The fire water level height of cold water storage tank 1 The diameter of each pipe in the circulation pipeline system ;

[0082] Bernoulli's equation for the region between the inlet section BB of the water pump 10 of the refrigeration unit and the water surface 1-1 of the cold water storage tank 1 is:

[0083] Equation (a);

[0084] in, Atmospheric pressure The pressure at the inlet section of water pump 10, For the density of water, It is the acceleration due to gravity. This is the kinetic energy correction factor. For head loss, This refers to the water flow velocity within the pipes of a circulating pipeline system.

[0085] Specifically, in step S2, head loss Including friction loss and local resistance loss ;

[0086] Among them, friction loss The calculation formula is as follows:

[0087] , This is the friction coefficient. The length of the pipeline between the inlet section of the water pump 10 of the refrigeration unit and the lower water distributor 3;

[0088] Local resistance loss The calculation formula is as follows:

[0089] , The local resistance coefficient of the pipeline between the inlet section CC of the water pump 10 of the refrigeration unit and the position marked A at the lower water distributor 3;

[0090] Based on the above calculation formula, we can conclude that:

[0091] Equation (b);

[0092] Based on equations (a) and (b), we can further derive:

[0093] Formula (c);

[0094] In the above formula, the vacuum height at the inlet section of the water pump 10 of the refrigeration unit is defined as... ,

[0095] Based on equation (c), the formula for calculating the water flow velocity in the pipes of a circulating pipeline system is as follows:

[0096] Formula (d).

[0097] Specifically, in step S3, to ensure normal flow in the second water supply pipe 5, which acts as a siphon, the vacuum height inside the siphon must be limited to be less than the maximum vacuum height. To calculate the maximum vacuum height, the Bernoulli equation used for calculation in the region between the top section of the second water supply pipe 5 and the water surface of the cold water storage tank 1 is:

[0098] , Equation (e);

[0099] in, The length of the pipe section between the top section of the second water supply pipe 5 and the lower water distributor 3. The local resistance coefficient between the top section of the second water supply pipeline 5 and the section between the lower water distributor 3 is given. The pressure at the top of the second water supply pipe 5;

[0100] Furthermore, based on equation (e), we can derive:

[0101] Equation (f), where z c Z1 is the height of the top of the second water supply pipeline 5 relative to the inlet section of the water pump 10 of the refrigeration unit, and Z2 is the height of the fire water level relative to the inlet section of the water pump 10 of the refrigeration unit.

[0102] Based on equations (f) and (c), we can derive:

[0103] Formula (g);

[0104] According to formula (g), the formula for calculating the maximum vacuum height under normal water flow conditions in the second water supply pipeline 5 is as follows:

[0105] , formula (h).

[0106] Specifically, in step S4, the allowable suction vacuum height parameter of the water pump 10 of the refrigeration unit is set to... This is one of the performance indicators of the water pump 10. This is because the vacuum degree cannot be increased indefinitely. When the absolute pressure at the inlet section is lower than the vaporization pressure at that water temperature, the water at the section vaporizes and generates bubbles, disrupting continuous flow. Simultaneously, the bubbles generated in the vaporization zone are carried out by the water flow and enter the pump. When these bubbles are compressed and suddenly collapse, pressures exceeding several hundred atmospheres can be created at the collapse point and its surroundings. If this process occurs on the surface of the water pump 10 components, it will cause rapid damage to the components; this phenomenon is called cavitation.

[0107] Will Substitute into expression (h) and replace The height setting condition Δh is obtained. min :

[0108] ;

[0109] Therefore, if the water level in the cold water storage tank 1 is to drop to the fire water level and then stop dropping, the second water supply pipe 5 must be higher than the fire water level. The above conditions must be met.

[0110] In summary, this application addresses the problems existing in the prior art by installing a second water supply pipe 5 with a Π-shaped structure in the pipeline between the lower water distributor 3 and the refrigeration unit. As the liquid level in the cold storage tank 1 continuously decreases, the height difference between the Π-shaped second water supply pipe 5 and the water level in the cold storage tank 1 continuously increases. When the water level in the cold storage tank 1 drops to near the fire-fighting water level, the height difference between the second water supply pipe 5 and the fire-fighting water level will prevent the water pump 10 of the refrigeration unit from continuing to draw water from the cold storage tank 1, thus ensuring that the fire-fighting water level remains unchanged. Furthermore, the pipeline layout design method of the water-based cold storage system in this application differs from the traditional technical solution of opening small holes or vacuum breaking holes in the outlet pipe, avoiding the disturbance of the inclined temperature layer of the cold storage system by overflow from the small holes, and ensuring the cold storage capacity and effect of the cold storage tank 1.

[0111] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A piping structure for a water-based cooling system, characterized in that, It includes a cold water storage tank, a refrigeration unit, a water distribution device, and a circulation pipeline system. The water distribution device is located in the cold water storage tank and is connected to the refrigeration unit through the circulation pipeline system. The water distribution device includes an upper water distributor and a lower water distributor, with the upper water distributor positioned above the lower water distributor. The circulating pipeline system includes a water supply pipeline, a return pipeline and a bypass pipeline. The water supply pipeline is connected to the lower water distributor and the refrigeration unit respectively, and the return pipeline is connected to the upper water distributor. The water supply pipeline includes a first water supply pipeline, a second water supply pipeline, and a third water supply pipeline. The second water supply pipeline is connected to the first water supply pipeline and the third water supply pipeline respectively. The first water supply pipeline is connected to the lower water distributor, and the third water supply pipeline is connected to the refrigeration device. The second water supply pipeline has a Π-shaped structure. The cold water storage tank is equipped with a fire water level, and the second water supply pipeline is located above the fire water level. When the water level in the cold storage tank drops to near the fire-fighting water level, the height difference between the second water supply pipeline and the fire-fighting water level will prevent the water pump of the refrigeration unit from continuing to draw water from the cold storage tank.

2. The piping structure of the water-based cooling system according to claim 1, characterized in that, Both the upper and lower water distributors include a plurality of water outlets, which are evenly distributed along the length of the upper and lower water distributors. The Reynolds number of the water inlet at each water outlet is set to 240 to 850, and the water flow rate at each water outlet is set to less than 0.03 m / s.

3. The piping structure of the water-cooled storage system according to claim 1, characterized in that, The refrigeration device includes a refrigeration unit, a cooling tower, and a water pump. The cooling tower is connected to the refrigeration unit, and the water pump is connected to the third water supply pipeline and the refrigeration unit.

4. A method for designing the layout of piping structures in a water-based cooling system, characterized in that, The piping structure of the water-cooled storage system according to any one of claims 1-3 includes the following steps: S1. When the water level in the cold storage tank drops to the fire water level, the Bernoulli equation is used to calculate the relative relationship between the head loss and the water flow velocity in the pipeline of the circulation pipeline system, taking the inlet section of the water pump of the refrigeration unit as the reference plane. S2. Calculate the head loss and, based on the head loss, calculate the water flow velocity in the pipeline of the circulation pipeline system; S3. Based on the above water flow velocity, Bernoulli's equation is used to calculate the maximum vacuum height value under normal water flow conditions in the second water supply pipeline in the area between the top section of the second water supply pipeline and the water surface of the cold water storage tank. S4. Substitute the allowable suction vacuum height parameter of the water pump of the refrigeration unit into the calculation formula of the maximum vacuum height value mentioned above to form a height setting condition for limiting the situation where the water level in the cold storage water tank drops to the fire water level and no longer continues to drop. This height setting condition is used to limit the design height between the second water supply pipeline and the fire water level of the cold storage water tank.

5. The method for designing the layout of the pipeline structure of the water-based cooling system according to claim 4, characterized in that, In step S1, the installation height of the water pump of the refrigeration unit is determined. The permissible suction vacuum height of the water pump Fire water level height of the cold storage tank The diameter of each pipe in the circulation pipeline system ; Bernoulli's equation for the region between the inlet section of the water pump in the refrigeration unit and the water surface of the cold storage tank is: Equation (a); in, Atmospheric pressure The pressure at the inlet section of the water pump. For the density of water, It is the acceleration due to gravity. This is the kinetic energy correction factor. For head loss, This refers to the water flow velocity within the pipes of a circulating pipeline system.

6. The method for designing the layout of the pipeline structure of the water-based cooling system according to claim 5, characterized in that, In step S2, the head loss Including friction loss and local resistance loss ; Among them, friction loss The calculation formula is as follows: , This is the friction coefficient. The length of the pipeline between the inlet section of the water pump of the refrigeration unit and the lower water distributor; Local resistance loss The calculation formula is as follows: , The local resistance coefficient is the section of pipe between the inlet section of the water pump and the lower water distributor of the refrigeration unit. Based on the above calculation formula, we can conclude that: Equation (b); Based on equations (a) and (b), we can further derive: Formula (c); In the above formula, the vacuum height at the inlet section of the water pump of the refrigeration unit is defined as... , Based on equation (c), the formula for calculating the water flow velocity in the pipes of a circulating pipeline system is as follows: Formula (d).

7. The method for designing the layout of the pipeline structure of the water-cooled storage system according to claim 6, characterized in that, In step S3, the Bernoulli equation calculated for the region between the top section of the second water supply pipeline and the water surface of the cold water storage tank is as follows: , Equation (e); in, This refers to the length of the pipe section between the top cross-section of the second water supply pipe and the lower water distributor. The local resistance coefficient between the top section of the second water supply pipeline and the section between the lower water distributor is given. The pressure at the top of the second water supply pipeline; Furthermore, based on equation (e), we can derive: Equation (f), where z c Z1 is the height of the top of the second water supply pipeline relative to the inlet section of the water pump of the refrigeration unit, and Z2 is the height of the fire water level relative to the inlet section of the water pump of the refrigeration unit. Based on equations (f) and (c), we can derive: Formula (g); Based on equation (g), the formula for calculating the maximum vacuum height under normal water flow conditions in the second water supply pipeline is derived: , formula (h).

8. The method for designing the layout of the pipeline structure of the water-cooled storage system according to claim 6, characterized in that, In step S4, the allowable suction vacuum height parameter of the water pump of the refrigeration unit is set to... ,Will Substitute into expression (h) and replace The height setting condition Δh is obtained. min : 。

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