Water cold storage system architecture

Abstract

The utility model relates to the technical field of chilled water storage, and discloses a chilled water storage system structure which comprises a chilled water circulating pump, a water chilling unit, a cold water discharging pump, a differential pressure bypass valve and a cold water storage tank. A water inlet of the chilled water circulating pump is communicated with the cold storage water tank, a water outlet of the chilled water circulating pump is communicated with a water inlet of the water chilling unit, a water outlet of the water chilling unit is communicated with a water inlet of a terminal user, and a water outlet of the terminal user is communicated with the cold storage water tank. A water inlet of the cold water discharging pump communicates with the cold water storage tank, and a water outlet of the cold water discharging pump communicates with a water inlet of a terminal user. A water inlet of the differential pressure bypass valve is communicated with a water outlet of the water chilling unit, and a water outlet of the differential pressure bypass valve is communicated with the cold storage water tank. The chilled water storage system architecture disclosed by the utility model not only can reduce the operation cost, but also can simplify the system and reduce the investment cost.

Description

Technical Field

[0001] The utility model relates to the technical field of water cooling storage, and in particular to a water cooling storage system architecture. Background Art

[0002] Water storage chilled water technology is a technology that utilizes the difference in electricity prices between peak and valley levels in the power grid, uses chillers to store cold during low electricity price periods, and uses the stored low-temperature chilled water to provide cooling for users during peak electricity price periods. This technology can transfer air conditioning electricity consumption during peak power periods to the valley level of the power grid, thereby saving users the operating costs of chillers, while also balancing the load of the power grid and achieving peak shifting and valley filling.

[0003] Existing water storage generally adopts a system architecture of indirect cold storage and cooling, or direct cold storage and indirect cooling. However, since the cold storage chiller needs to operate independently of the normal cold supply chiller, and the cold storage temperature must be lower than the normal cold supply temperature, the efficiency of the cold storage chiller is low during cold storage, which is not conducive to reducing operating costs. In addition, the above system architecture also requires the addition of heat exchange plates, constant pressure water replenishment devices, and control valves, which makes the system complex and the investment cost high.

[0004] For projects such as semiconductors, which have large cooling loads, continuous cooling throughout the year, and buildings that are generally 40 meters high or less, the applicability and economy of traditional water storage cooling methods need to be optimized. Utility Model Content

[0005] The utility model provides a water storage cooling system architecture, which can not only reduce operating costs, but also simplify the system and reduce investment costs.

[0006] The utility model provides a water cold storage system architecture, including a chilled water circulation pump, a chiller, a cold water pump, a pressure difference bypass valve and a cold water storage tank;

[0007] The water inlet of the chilled water circulation pump is communicated with the cold water storage tank, the water outlet of the chilled water circulation pump is communicated with the water inlet of the chiller, the water outlet of the chiller is communicated with the water inlet of the end user, and the water outlet of the end user is communicated with the cold water storage tank;

[0008] The water inlet of the cooling water pump is connected to the cold water storage tank, and the water outlet of the cooling water pump is connected to the water inlet of the end user;

[0009] The water inlet of the pressure differential bypass valve is communicated with the water outlet of the chiller, and the water outlet of the pressure differential bypass valve is communicated with the cold water storage tank.

[0010] The water cold storage system architecture provided by the utility model can realize different working modes of normal cold supply, cold storage and cold release of the system by setting a chilled water circulation pump, a chiller, a cold storage water tank, a pressure difference bypass valve and a cold release water pump. When the system is normally supplying cold, the chilled water circulation pump and the chiller work, and the chilled water passing through the end user enters the chiller through the chilled water circulation pump. The chiller exchanges heat with the chilled water and then supplies cold to the end user. When the system is storing cold, the chilled water circulation pump, the chiller and the pressure difference bypass valve work, and part of the chilled water passing through the chiller supplies cold to the end user, and the other part returns to the cold storage water tank through the pressure difference bypass valve for cold charging. When the system is releasing cold, the cold release water pump works, and the chilled water in the cold storage water tank is passed through the cold release water pump to supply cold to the end user. The water cold storage system architecture in the utility model can improve the efficiency of the chiller and reduce the operating cost because it adopts the direct cold storage and cold release mode. In addition, the system has a simple structure, and the cold water storage tank is used as a constant-pressure water replenishment and exhaust device and a chiller, and a separate cold water discharge pump is provided, so that direct charging and cooling can be performed, avoiding the cost of additional equipment and helping to reduce costs.

[0011] In some possible implementations, the cold water storage tank is provided with a first circulation port and a second circulation port, the first circulation port is located near the top of the cold water storage tank, and the second circulation port is located near the bottom of the cold water storage tank;

[0012] The cold water storage tank is connected to the water inlet of the chilled water circulation pump and the water outlet of the end user through the first circulation port;

[0013] The cold water storage tank is communicated with the water inlet of the cooling water pump and the water outlet of the pressure difference bypass valve through the second flow port.

[0014] In some possible implementation schemes, the liquid level inside the cold water storage tank is 1m to 5m higher than the highest water usage point of the end user.

[0015] In some possible implementation schemes, the water inlet of the pressure differential bypass valve is also connected to the water outlet of the cooling water pump, and the water outlet of the pressure differential bypass valve is also connected to the water inlet of the cooling water pump.

[0016] In some possible implementation schemes, the cold water storage tank is further provided with a water replenishment port, and the water replenishment port is located near the top of the cold water storage tank.

[0017] In some possible implementation schemes, a water level sensor is provided inside the cold water storage tank, and the water level sensor is used to detect the water level in the cold water storage tank.

[0018] In some possible implementation schemes, a plurality of temperature sensors are disposed inside the cold water storage tank, and the plurality of temperature sensors are spaced apart along the height direction of the cold water storage tank, and each of the temperature sensors is used to detect the water temperature at a corresponding height. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a water cooling system architecture in an embodiment of the utility model;

[0020] Figure 2 for Figure 1 The state of the grey water cooling system architecture during normal cooling;

[0021] Figure 3 for Figure 1 The state of the grey water cold storage system architecture during cold storage;

[0022] Figure 4 for Figure 1 A state of the grey water cooling system architecture when cooling;

[0023] Figure 5 for Figure 1 Another state of the grey water chilled storage system architecture when cooling.

[0024] In the figure:

[0025] 10- chilled water circulation pump; 20- chiller; 30- cold water storage tank; 31- first circulation port; 32- second circulation port; 33- water replenishment port; 40- cooling water discharge pump; 50- differential pressure bypass valve; 60- end user. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] refer to Figure 1 The water cold storage system architecture in the embodiment of the utility model includes a chilled water circulation pump 10, a chiller 20, a cooling water pump 40, a pressure difference bypass valve 50 and a cold storage water tank 30. The water cold storage system architecture can be used for cold storage and for providing cold to end users 60.

[0028] Specifically, the water inlet of the chilled water circulation pump 10 is connected to the cold water storage tank 30, the water outlet of the chilled water circulation pump 10 is connected to the water inlet of the cold water inlet group, the water outlet of the chiller 20 is connected to the water inlet of the end user 60, and the water outlet of the end user 60 is connected to the cold water storage tank 30. The water inlet of the pressure difference bypass valve 50 is connected to the water outlet of the chiller 20, and the water outlet of the pressure difference bypass valve 50 is connected to the cold water storage tank 30. The water inlet of the cooling water pump 40 is connected to the cold water storage tank 30, and the water outlet of the cooling water pump 40 is connected to the water inlet of the end user 60.

[0029] The water cold storage system architecture in this embodiment can be used for both cold supply and cold storage. Exemplarily, when the water cold storage system architecture is used for cold supply, the chilled water in the system enters the chiller 20 through the chilled water circulation pump 10 after heat exchange with the end user 60, and then flows to the end user 60 after heat exchange with the chiller 20, and heat exchange is performed on the end user 60, thereby completing the cycle of cold supply by the conventional chiller. When the water cold storage system architecture is used for cold storage, the chilled water circulation pump 10 and the pressure difference bypass valve 50 are opened, and the output of the chilled water circulation pump 10 is increased according to the required cold charging rate. The water in the system first passes through the chilled water circulation pump 10 and then enters the chiller 20. A part of the chilled water after cooling by the chiller 20 flows to the end user 60 for cooling the end user 60, and another part of the chilled water after cooling by the chiller 20 returns to the cold storage water tank 30 through the pressure difference bypass valve 50, thereby completing cold storage.

[0030] It should be understood that the water cold storage system architecture in this embodiment realizes direct cooling by independently setting up a cooling water pump 40 and a cold storage water tank 30. It can not only avoid the complicated switching action performed by borrowing the chilled water circulation pump 10, but also avoid the need to overcome the power consumption of the chiller 20 due to the use of the chilled water pump for cooling, which is beneficial to reduce operating costs.

[0031] In some embodiments, the water inlet of the pressure differential bypass valve 50 may also be connected to the water outlet of the cooling water pump 40, and the water outlet of the pressure differential bypass valve 50 may also be connected to the water inlet of the cooling water pump 40. That is, when the chilled water in the cold water storage tank 30 is used to cool the end user 60, when the minimum limited output flow of the cooling pump 40 is greater than the flow required by the end user 60, a part of the chilled water passing through the cooling water pump 40 is diverted to the pressure differential bypass valve 50, and then returns to the cooling water pump 40 after passing through the pressure differential bypass valve 50, so that the cooling water pump 40 can accurately cool the end user 60.

[0032] For example, the cold water storage tank 30 and the water inlet of the cooling water pump 40 can be connected through a first pipe, and the water outlet of the pressure differential bypass valve 50 can be connected to the middle of the first pipe through a second pipe. At this time, the chilled water passing through the pressure differential bypass valve 50 can flow to the cold water storage tank 30 or the cooling water pump 40 after flowing to the middle of the first pipe through the second pipe. The above design not only meets the use of the pressure differential bypass valve 50 under different working conditions, but also can further simplify the system structure and save costs.

[0033] In some embodiments, continue to refer to Figure 1 The cold water tank 30 may be provided with a first flow port 31 and a second flow port 32, wherein the first flow port 31 is located near the top of the cold water tank 30, and the second flow port 32 is located near the bottom of the cold water tank 30. The water outlet of the end user 60 and the water inlet of the chilled water circulation pump 10 are both connected to the first flow port 31, and the water inlet of the cooling water pump 40 and the water outlet of the pressure difference bypass valve 50 are both connected to the second flow port 32. In the cold water tank 30, the temperature of the chilled water at the bottom is lower than that of the chilled water at the upper layer. The temperature of the chilled water after being cooled by the chiller 20 is relatively low, and it returns to the bottom of the cold water tank 30 through the pressure difference bypass valve 50, which can facilitate the storage of chilled water. When the system is storing cold, the chilled water circulation pump 10 extracts the chilled water located in the upper layer of the cold storage water tank 30, and exchanges heat through the chiller 20. Since the utility model adopts direct charging and discharging, the cold storage water temperature is higher than that required for conventional cold storage, so the energy efficiency of the chiller 20 can be improved. For example, when the water supply temperature in this embodiment differs from the water temperature of conventional cold storage by 2°C, the energy efficiency of the chiller 20 can be improved by about 4%.

[0034] In this embodiment, the liquid level inside the cold water storage tank 30 is higher than the highest water consumption point of the end user 60. Specifically, the liquid level inside the cold water storage tank 30 is 1m to 5m higher than the highest water consumption point of the end user 60. At this time, the cold water storage tank 30 can also serve as a constant pressure device of the system, saving investment costs.

[0035] In addition, a plurality of temperature sensors (not shown in the figure) may be arranged in the cold water tank 30, and the plurality of temperature sensors may be arranged at intervals along the height direction of the cold water tank 30. The plurality of temperature sensors may be used to detect the distribution of the temperature field in the cold water tank 30, that is, the water temperature of each layer in the cold water tank 30 may be monitored by arranging a plurality of temperature sensors. In the process of using the chilled water circulation pump 10 and the chiller 20 to provide cooling to the end user 60, since the chilled water cooled by the chiller 20 continuously enters the bottom of the cold water tank 30, the chilled water in the upper layer of the cold water tank 30 is replaced by the chiller 20 for cooling. When the temperature of the upper layer of the chilled water is reduced to a preset value, the temperature of the chilled water in the cold water tank 30 may be controlled by closing or reducing the pressure difference bypass valve 50.

[0036] Further, continue to refer to Figure 1 A water replenishment port 33 is also provided near the top of the cold water tank 30, and a water level sensor (not shown in the figure) is also provided in the cold water tank 30, which is used to detect the water level in the cold water tank 30. When the water level in the cold water tank 30 is lower than the preset value, the water replenishment port 33 can be opened to replenish the cold water tank 30, so as to maintain the normal liquid level of the cold water tank 30. At this time, the cold water tank 30 can also serve as a constant pressure water replenishment and exhaust device, thereby saving the cost of separately setting up a constant pressure water replenishment and exhaust device.

[0037] To facilitate understanding of the different operation modes of the water storage cooling system architecture in this embodiment, the following will be combined with Figures 2 to 5 The specific working process of the water storage cooling system architecture in different operating modes is introduced. It should be noted that Figures 2 to 5 In the figure, solid lines represent used pipes and dashed lines represent unused pipes.

[0038] Combination Figure 2 In the case of normal cooling, the cold water storage tank 30 is regarded as a part of the pressure difference bypass pipe. At this time, the chilled water in the system flows to the chilled water circulation pump 10 after heat exchange with the end user 60, and then flows to the end user 60 after heat exchange with the chiller 20. The cooling water that has completed cooling for the end user 60 flows to the chilled water circulation pump 10 again, and thus, circulating cooling is performed.

[0039] In the present embodiment, when the system is in normal cooling mode, the cold water storage tank 30 also serves as the system's constant pressure water replenishment device, so as to provide constant pressure water replenishment for the system cycle. In this process, the cold water pump 40 is in a closed state, and the pressure differential bypass valve 50 can be opened or closed as appropriate. Figure 2 As shown, if the supply and return water pressure difference of the system is greater than or equal to the set value, the pressure difference bypass valve 50 can be closed, and the chilled water passing through the chiller 20 only flows to the end user 60.

[0040] In another embodiment, Figure 3 As shown, if the supply and return water pressure difference of the system is greater than the set value, and the chilled water circulation pump 10 has been reduced to the minimum allowable frequency, the pressure differential bypass valve 50 can be opened, and a part of the chilled water passing through the chiller 20 flows to the end user 60, and the other part passes through the pressure differential bypass valve 50 and enters the cold water tank 30. At this time, the cold water tank 30 can be regarded as a section of pressure differential bypass pipe.

[0041] Combination Figure 3In the water cold storage system of this embodiment, when cold storage is in progress, the pressure difference bypass valve 50 and the chilled water circulation pump 10 are opened, and the output of the chilled water circulation pump 10 is increased according to the required cold charging rate. After the system's chilled water completes the heat exchange with the end user, it flows from the chilled water circulation pump 10 to the chiller 20. After the heat exchange with the chiller 20, part of the chilled water is used to provide cold to the end user 60, and the other part of the chilled water flows through the pressure difference bypass valve 50 and enters the cold storage water tank 30 through the second flow port 32. In the above process, the cold storage water tank 30 is not only a cold storage device, but also serves as a constant pressure device for the system. At this time, the second flow port 32 of the cold storage water tank 30 is used to flow in chilled water, and the first flow port 31 is used to flow out chilled water. The cold storage water tank 30 can be regarded as an end user 60 put into system operation. Furthermore, in the above process, the cold storage rate can be controlled by controlling the opening of the pressure difference bypass valve 50, so that the system can complete the cold storage work while providing normal cooling, and the system control is simple, the operation is efficient and energy-saving.

[0042] After the cold storage is completed and the cold is not released, the pressure difference bypass valve 50 can be closed or reduced, and the system can return to normal cooling.

[0043] Combination Figure 4 In the cold water storage system of this embodiment, when cooling, the cooling water pump 40 is turned on, and the chilled water in the cold water storage tank 30 flows from the second flow port 32 to the cooling water pump 40, and then flows from the cooling water pump 40 to the end user 60 to provide cooling to the end user 60. The cooling water that has completed the cooling of the end user 60 flows into the cold water storage tank 30 from the first flow port 31. In the above process, the cold water storage tank 30 can be regarded as a chiller for providing chilled water to the end user 60.

[0044] Or, combined Figure 5 In the cold water storage system of this embodiment, when cooling, the cooling water pump 40 and the chilled water circulation pump 10 are turned on at the same time, and the chilled water in the cold water storage tank 30 flows from the second flow port 32 to the cooling water pump 40, and then flows from the cooling water pump 40 to the end user 60 to provide cooling for the end user 60. At the same time, the chilled water in the system flows from the chilled water circulation pump 10 to the chiller 20, and then flows to the end user 60 after heat exchange in the chiller 20. That is to say, in the above process, the cooling water pump 40 and the chiller 20 jointly provide cooling for the end user 60.

[0045] It is worth mentioning that the pressure differential bypass valve 50 in this embodiment can also serve as a cold charging valve, and the pressure differential bypass valve 50 can be selected according to the flow capacity of different requirements in the two requirements of pressure differential bypass and cold charging. In other words, if the flow rate required for the pressure differential bypass is large, the pressure differential bypass valve 50 is used to meet the pressure differential bypass requirement, and if the flow rate required for cold charging is large, the pressure differential bypass valve 50 is used to meet the cold charging requirement. In addition, if the pressure differential bypass valve 50 has a large flow rate when in use, it can be considered to set two or more pressure differential bypass valves 50 connected in parallel, so that each pressure differential bypass valve 50 can be diverted, thereby meeting the use requirements of different working conditions.

[0046] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A water storage cooling system architecture, characterized in that: Including chilled water circulation pump, chiller, cooling water pump, pressure difference bypass valve and cold water storage tank; The water inlet of the chilled water circulation pump is communicated with the cold water storage tank, the water outlet of the chilled water circulation pump is communicated with the water inlet of the chiller, the water outlet of the chiller is communicated with the water inlet of the end user, and the water outlet of the end user is communicated with the cold water storage tank; The water inlet of the cooling water pump is connected to the cold water storage tank, and the water outlet of the cooling water pump is connected to the water inlet of the end user; The water inlet of the pressure differential bypass valve is communicated with the water outlet of the chiller, and the water outlet of the pressure differential bypass valve is communicated with the cold water storage tank.

2. The water storage cooling system architecture according to claim 1 is characterized in that: The cold water storage tank is provided with a first circulation port and a second circulation port, wherein the first circulation port is located near the top of the cold water storage tank, and the second circulation port is located near the bottom of the cold water storage tank; The cold water storage tank is connected to the water inlet of the chilled water circulation pump and the water outlet of the end user through the first circulation port; The cold water storage tank is communicated with the water inlet of the cooling water pump and the water outlet of the pressure difference bypass valve through the second flow port.

3. The water storage cooling system architecture according to claim 2 is characterized in that: The liquid level inside the cold water storage tank is 1m to 5m higher than the highest water use point of the end user.

4. The water storage cooling system architecture according to claim 1, characterized in that: The water inlet of the pressure difference bypass valve is also communicated with the water outlet of the cooling water pump, and the water outlet of the pressure difference bypass valve is also communicated with the water inlet of the cooling water pump.

5. The water storage cooling system architecture according to claim 1, characterized in that: The cold water storage tank is also provided with a water replenishment port, and the water replenishment port is located near the top of the cold water storage tank.

6. The water storage cooling system architecture according to claim 5, characterized in that: A water level sensor is provided inside the cold water storage tank, and the water level sensor is used to detect the water level in the cold water storage tank.

7. The water cooling system architecture according to claim 1, characterized in that: A plurality of temperature sensors are arranged inside the cold water storage tank, and the plurality of temperature sensors are arranged at intervals along the height direction of the cold water storage tank, and each of the temperature sensors is used to detect the water temperature at a corresponding height.

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