Park cooling flow balance adjusting system

Abstract

The utility model provides a kind of park cooling flow balance regulating system, including cooling subsystem and flow regulating subsystem.The park cooling flow balance regulating system can be according to the temperature data at preset position on water supply pipeline, return water pipeline and bypass pipeline, judge the flow size of each place of cooling circuit, to adjust the number of refrigeration machine opening, make refrigeration machine opening number, primary water pump start number and cooling circuit demand flow adaptation, both can ensure timely cooling, can also reduce energy waste.Meanwhile, the flow regulating subsystem of the utility model can be used with existing cooling circuit without cutting off water and cutting off pipeline to add sensor, realizes real-time acquisition using internet of things technology, and system construction is lightweight and convenient.

Description

Technical Field

[0001] This utility model relates to the field of water supply and drainage technology, and in particular to a cooling flow balance regulation system for industrial parks. Background Technology

[0002] Currently, centralized cooling in industrial parks is typically provided by an energy center, and then piped to each building. Bypass pipes are installed on the building side for primary and secondary flow balancing and regulation. In large industrial parks, the cooling transmission distance is long and the building area is large, especially in super high-rise buildings. There is a problem that the cooling load demand side and the cooling supply side are not synchronized. It is a system with high inertia, and it takes more than half an hour for the refrigerant to travel from the cooling supply side to the building load and back to the cooling supply side.

[0003] To achieve timely and high-quality cooling supply on demand, the primary and secondary flow rates need to be matched. The relevant technology employs a solution where the secondary water pumps on the building side use variable frequency drives (VFDs) to control their flow rate based on the inlet and outlet water pressures, while the primary water pumps on the cooling side use fixed frequency flow rates. The number of primary water pumps in operation matches the number of chiller units in operation, and the number of chiller units in operation is generally determined based on operational experience or the supply and return water temperatures on the energy supply side.

[0004] Therefore, the primary and secondary water pumps are currently controlled and operated independently. It is difficult to achieve a perfect match between the number of chillers in operation and the flow demand of the secondary water pumps on the building side. This can easily lead to problems such as insufficient chiller operation causing untimely cooling or excessive chiller operation causing energy waste. Utility Model Content

[0005] The purpose of this utility model is to provide a park cooling flow balance regulation system. Based on the temperature data at preset locations on the water supply pipe, return pipe and bypass pipe, the system determines the flow rate at each point in the cooling circuit, thereby adjusting the number of chillers that are turned on. This ensures that the number of chillers turned on and the number of primary water pumps started are matched with the required flow rate of the cooling circuit, thus guaranteeing timely cooling and reducing energy waste.

[0006] To achieve the above objectives, this utility model provides a park cooling flow balance regulation system, including a cooling subsystem and a flow regulation subsystem; wherein,

[0007] The cooling subsystem includes a chiller, a primary water pump, a secondary water pump, and a heat exchanger installed in the building. The chiller is connected to the heat exchanger via a supply water pipe and a return water pipe to form a cooling circuit. A bypass pipe is provided between the heat exchanger and the chiller. The two ends of the bypass pipe are connected to the supply water pipe and the return water pipe, respectively. The primary water pump is installed on the return water pipe between the bypass pipe and the chiller, and the secondary water pump is installed on the supply water pipe between the bypass pipe and the heat exchanger.

[0008] The flow regulation subsystem includes a control module and a temperature sensing module connected to the control module, and the control module is controlled and connected to the refrigeration unit.

[0009] The temperature sensing module is configured to simultaneously collect the first pipe wall temperature of the water supply pipe between the chiller and the bypass pipe, the second pipe wall temperature of the water supply pipe between the bypass pipe and the heat exchanger, the third pipe wall temperature of the bypass pipe and the ambient temperature of the bypass pipe, the fourth pipe wall temperature of the return water pipe between the bypass pipe and the heat exchanger, and the fifth pipe wall temperature of the return water pipe between the chiller and the bypass pipe.

[0010] The control module is configured to control the number of refrigeration units to be turned on based on the first pipe wall temperature, the second pipe wall temperature, the third pipe wall temperature, the fourth pipe wall temperature, the fifth pipe wall temperature and the ambient temperature.

[0011] Furthermore, the temperature sensing module includes six temperature sensing units, which are respectively set at preset positions on the corresponding pipes.

[0012] Furthermore, the temperature sensing unit includes a temperature sensor.

[0013] Furthermore, the temperature sensor used to collect the temperature of each pipe wall is a patch temperature sensor, which is attached to the outer wall of the corresponding pipe.

[0014] Furthermore, the temperature sensing module and the control module are connected via signal lines.

[0015] Furthermore, the temperature sensing module and the control module are connected via a wireless communication module.

[0016] Furthermore, the wireless communication module includes at least one of a 4G module, a 5G module, a WiFi module, a ZigBee module, and a Bluetooth module.

[0017] Furthermore, the control module includes a microcontroller, an ARM microcontroller, or a PLC controller.

[0018] Furthermore, the control module is connected to the refrigerator via a signal line.

[0019] Furthermore, the control module is connected to the refrigeration unit via a wireless communication module.

[0020] The beneficial effects of this utility model are reflected in:

[0021] The park cooling flow balance regulation system provided in this application can determine the flow rate at each point in the cooling circuit based on the temperature data at preset locations on the water supply pipe, return pipe, and bypass pipe, thereby adjusting the number of chillers that are turned on. This ensures that the number of chillers turned on and the number of primary water pumps started are matched with the required flow rate of the cooling circuit, thus guaranteeing timely cooling and reducing energy waste.

[0022] Meanwhile, the flow regulation subsystem of this utility model can be used in conjunction with the existing cooling circuit without the need to shut off the water or disconnect the pipeline and install sensors. It adopts Internet of Things technology to achieve real-time data acquisition, and the system is lightweight and convenient to build. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0025] Figure 1 This is a schematic diagram of the park cooling system structure provided in this embodiment.

[0026] Figure 2 A schematic diagram of the structure of the park cooling flow balance regulation system provided in the embodiments of this application;

[0027] Figure 3 This is a system structure block diagram of the flow regulation subsystem provided in an embodiment of this application.

[0028] The realization of the objectives, functional features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and textual descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0029] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0030] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0031] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] In related technologies, such as Figure 1 As shown, the park's cooling system is generally centralized by the energy center, and then distributed to each building via pipelines. Bypass pipelines are installed on the building side for primary and secondary flow balance regulation. Specifically, in Figure 1 The centralized cooling system shown includes a chiller 1, a primary water pump 2, a secondary water pump 3, and a heat exchanger 4 installed inside the building. The chiller 1 is connected to the heat exchanger 4 via a supply water pipe 5 and a return water pipe 6 to form a cooling circuit. A bypass pipe 7 is provided between the heat exchanger 4 and the chiller 1, with both ends of the bypass pipe 7 connected to the supply water pipe 5 and the return water pipe 6, respectively. The primary water pump 2 is installed on the return water pipe 6 between the bypass pipe 7 and the chiller 1, and the secondary water pump 3 is installed on the supply water pipe 5 between the bypass pipe 7 and the heat exchanger 4. It is understood that there can be multiple chillers 1, primary water pump 2, and secondary water pump 3, meaning that different numbers of chillers 1, primary water pump 2, and secondary water pump 3 can be activated according to cooling demand.

[0036] In large industrial parks, where the cooling supply distance is long and the buildings are large, especially high-rise buildings, there is a problem of the cooling load demand side and the cooling supply side not being synchronized. This is a high-inertia system, where it takes more than half an hour for the refrigerant to travel from the cooling supply side to the building load and back to the cooling supply side. For example... Figure 1 As shown, based on the theoretical calculations of the process system, let the primary side flow rate be Q1, the secondary side flow rate be Q2, and the bypass pipe flow rate be Q0. Q0 is considered positive when flowing from left to right. There are three possible operating scenarios:

[0037] Scenario 1: Q1 <Q2,Q0=Q1-Q2<0;

[0038] Problem: Cooling may not be supplied in a timely manner, and the cooling capacity of the building may not be guaranteed.

[0039] Case 2: Q1>Q2, Q0=Q1-Q2>0;

[0040] Problem: There is a possibility of over-operation of the refrigeration unit, resulting in a huge waste of energy.

[0041] Case 3: Q1=Q2, Q0=Q1-Q2=0;

[0042] Scenario 3 is the most ideal state.

[0043] To achieve timely and high-quality cooling supply on demand, the primary and secondary flow rates need to be matched. The relevant technology employs a solution where the secondary water pumps on the building side use variable frequency drives (VFDs) to control their flow rate based on the inlet and outlet water pressures, while the primary water pumps on the cooling side use fixed frequency flow rates. The number of primary water pumps in operation matches the number of chiller units in operation, and the number of chiller units in operation is generally determined based on operational experience or the supply and return water temperatures on the energy supply side.

[0044] Therefore, the primary and secondary water pumps are currently controlled and operated independently. It is difficult to achieve a perfect match between the number of chillers in operation and the flow demand of the secondary water pumps on the building side. This can easily lead to problems such as insufficient chiller operation causing untimely cooling or excessive chiller operation causing energy waste.

[0045] To address this issue, a common solution in related technologies involves installing flow sensors on the primary, secondary, and bypass pipes to obtain the primary flow rate Q1, secondary flow rate Q2, and bypass flow rate Q0. Flow sensors come in various types, with electromagnetic flow meters and ultrasonic flow meters being the most common. Installing electromagnetic flow meters is expensive, requiring water shut-off and pipe cutting for installation, and also necessitates integration with an automated control system, making it difficult for most buildings to afford the high costs. While ultrasonic flow meters are cheaper and do not require water shut-off, they are more susceptible to external interference, resulting in larger measurement deviations. More importantly, their installation conditions are demanding, often difficult to meet with existing systems.

[0046] To address this, this application provides a novel solution. This solution determines the flow rate at each point in the cooling circuit based on temperature data at preset locations on the water supply pipe, return pipe, and bypass pipe. This allows for adjustment of the number of chillers that are turned on, ensuring that the number of chillers and primary water pumps started matches the required flow rate of the cooling circuit. This approach guarantees timely cooling while reducing energy waste.

[0047] Meanwhile, the flow regulation subsystem of this utility model can be used in conjunction with the existing cooling circuit without the need to shut off the water or disconnect the pipeline and install sensors. It adopts Internet of Things technology to achieve real-time data acquisition, and the system is lightweight, convenient to build, and highly accurate.

[0048] like Figure 2 As shown in the figure, an embodiment of this application provides a park cooling flow balance regulation system, including a cooling subsystem and a flow regulation subsystem. The specific structure of the cooling subsystem is as follows: Figure 1 and Figure 2As shown, it specifically includes a chiller 1, a primary water pump 2, a secondary water pump 3, and a heat exchanger 4 disposed in a building. The chiller 1 is communicated with the heat exchanger 4 through a water supply pipeline 5 and a water return pipeline 6 to form a cooling supply circuit. A bypass pipeline 7 is disposed between the heat exchanger 4 and the chiller 1, and two ends of the bypass pipeline 7 are respectively communicated with the water supply pipeline 5 and the water return pipeline 6. The primary water pump 2 is disposed on the water return pipeline 6 between the bypass pipeline 7 and the chiller 1, and the secondary water pump 3 is disposed on the water supply pipeline 5 between the bypass pipeline 7 and the heat exchanger 4.

[0049] As Figure 3 shown, the flow regulation subsystem comprises a control module and a temperature sensing module connected with the control module, and the control module is in control connection with the chiller 1. The temperature sensing module is configured to simultaneously collect a first pipe wall temperature T1 of the water supply pipeline 5 between the chiller 1 and the bypass pipeline 7, a second pipe wall temperature T2 of the water supply pipeline 5 between the bypass pipeline 7 and the heat exchanger 4, a third pipe wall temperature T3 of the bypass pipeline 7, and the ambient temperature T where the bypass pipeline 7 is located a , a fourth pipe wall temperature T4 of the water return pipeline 6 between the bypass pipeline 7 and the heat exchanger 4, and a fifth pipe wall temperature T5 of the water return pipeline 6 between the chiller 1 and the bypass pipeline 7.

[0050] The control module is configured to control the number of operating chillers 1 according to the first pipe wall temperature, the second pipe wall temperature, the third pipe wall temperature, the fourth pipe wall temperature, the fifth pipe wall temperature and the ambient temperature.

[0051] With reference to Figure 2 , temperature sensors T1 and T5 are respectively disposed on the primary-side water supply and return paths, temperature sensors T2 and T4 are respectively disposed on the secondary-side water supply and return paths, and a temperature sensor T3 and an ambient temperature sensor Ta are disposed in the middle of the bypass pipeline, which are respectively used for collecting corresponding temperature data. The three water balance operation conditions are as follows:

[0052] 1) When Q1>Q2, Q0=Q1-Q2>0, T1=T2, T5>T4, T3=T1;

[0053] 2) When Q1<Q2, Q0=Q1-Q2<0, T1<T2, T5=T4, T3=T4;

[0054] 3) When Q1=Q2, Q0=Q1-Q2=0, T1=T2, T5=T4, T3=T a ;

[0055] Reverse reasoning:

[0056] 1) When T1=T2, T5>T4, and T3=T1, Q1>Q2, and Q0=Q1-Q2>0;

[0057] 2) When T1<T2, T4=T5, and T3=T4, Q1<Q2, and Q0=Q1-Q2<0;

[0058] 3) When T1=T2, T4=T5, T3=T a , Q1=Q2, and Q0=Q1-Q2=0.

[0059] Accordingly, we infer the matching condition of Q1 and Q2 through the magnitudes of T1 and T2, the magnitudes of T4 and T5, as well as the temperature values of T3 and T a .

[0060] For example, when the inner diameter of the pipeline is determined, if T1=T2, T5>T4, and T3=T1, and the duration thereof is longer than a preset duration, for example, lasting for 30 minutes or more, the number of operating refrigerators can be further determined to be reduced according to the specific temperature values of T1 and T5; if T1<T2, T4=T5, and T3=T4, and the duration thereof is longer than a preset duration, for example, lasting for 30 minutes or more, the number of operating refrigerators can be further determined to be increased according to the specific temperature values of T1 and T5.

[0061] Specifically, in this embodiment, the temperature sensing module includes six temperature sensing units, and the six temperature sensing units are respectively disposed at preset positions of the corresponding pipelines. The temperature sensing units may adopt temperature sensors. Specifically, the temperature sensors for collecting the wall temperature of each pipeline are patch-type temperature sensors, which can be directly attached to the outer wall of the corresponding pipeline so as to collect the temperature of the outer wall of the pipeline. The ambient temperature sensor Ta for collecting the ambient temperature around the bypass pipeline needs to be disposed at least a preset distance away from the bypass pipeline, so as to reduce the influence of heat radiated by the bypass pipeline on the ambient temperature collected by the ambient temperature sensor Ta and reduce errors. The preset distance can be set according to design requirements, which is not specifically limited in this embodiment.

[0062] In an exemplary embodiment, the temperature sensing module and the control module may be connected through a signal line. Certainly, the temperature sensing module and the control module may also be connected through a wireless communication module. The wireless communication module includes at least one of a 4G module, a 5G module, a WiFi module, a ZigBee module, and a Bluetooth module. Wireless connection through the wireless communication module makes networking and system construction more convenient. Exemplarily, the control module may adopt a single-chip microcomputer, an ARM microcontroller, or a PLC controller.

[0063] In one exemplary embodiment, the control module and the refrigerator 1 can be connected via a signal line. Alternatively, the control module and the refrigerator 1 can also be connected via a wireless communication module. The wireless communication module includes at least one of a 4G module, a 5G module, a WiFi module, a ZigBee module, and a Bluetooth module. Wireless connection via a wireless communication module facilitates network setup and system construction.

[0064] In summary, the park cooling flow balance regulation system provided in this application can determine the flow rate at each point in the cooling circuit based on the temperature data at preset locations on the water supply pipe, return pipe, and bypass pipe, thereby adjusting the number of chillers that are turned on. This ensures that the number of chillers and primary water pumps started are matched with the required flow rate of the cooling circuit, guaranteeing timely cooling while reducing energy waste.

[0065] Meanwhile, the flow regulation subsystem of this utility model can be used in conjunction with the existing cooling circuit without the need to shut off the water or disconnect the pipeline and install sensors. It adopts Internet of Things technology to achieve real-time data acquisition, and the system is lightweight and convenient to build.

[0066] Finally, it should be noted that the technical features of the technical solution of this application can be combined arbitrarily. In order to simplify the description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0067] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A cooling flow balance regulation system for industrial parks, characterized in that, It includes a cooling subsystem and a flow control subsystem; among which, The cooling subsystem includes a chiller (1), a primary water pump (2), a secondary water pump (3), and a heat exchanger (4) installed in the building. The chiller (1) is connected to the heat exchanger (4) through a water supply pipe (5) and a return water pipe (6) to form a cooling circuit. A bypass pipe (7) is provided between the heat exchanger (4) and the chiller (1). The two ends of the bypass pipe (7) are connected to the water supply pipe (5) and the return water pipe (6) respectively. The primary water pump (2) is installed on the return water pipe (6) between the bypass pipe (7) and the chiller (1). The secondary water pump (3) is installed on the water supply pipe (5) between the bypass pipe (7) and the heat exchanger (4). The flow regulation subsystem includes a control module and a temperature sensing module connected to the control module, and the control module is controlled to the refrigeration unit (1); The temperature sensing module is configured to simultaneously collect the first pipe wall temperature of the water supply pipe (5) between the refrigerator (1) and the bypass pipe (7), the second pipe wall temperature of the water supply pipe (5) between the bypass pipe (7) and the heat exchanger (4), the third pipe wall temperature of the bypass pipe (7), the ambient temperature of the bypass pipe (7), the fourth pipe wall temperature of the return water pipe (6) between the bypass pipe (7) and the heat exchanger (4), and the fifth pipe wall temperature of the return water pipe (6) between the refrigerator (1) and the bypass pipe (7). The control module is configured to control the number of refrigeration units (1) to be turned on based on the first pipe wall temperature, the second pipe wall temperature, the third pipe wall temperature, the fourth pipe wall temperature, the fifth pipe wall temperature and the ambient temperature.

2. The park cooling flow balance regulation system as described in claim 1, characterized in that, The temperature sensing module includes six temperature sensing units, which are respectively set at preset positions on the corresponding pipes.

3. The park cooling flow balance regulation system as described in claim 2, characterized in that, The temperature sensing unit includes a temperature sensor.

4. The park cooling flow balance regulation system as described in claim 3, characterized in that, The temperature sensor used to collect the temperature of each pipe wall is a patch temperature sensor, which is attached to the outer wall of the corresponding pipe.

5. A park cooling flow balance regulation system as described in any one of claims 1-4, characterized in that, The temperature sensing module and the control module are connected via a signal line.

6. A park cooling flow balance regulation system as described in any one of claims 1-4, characterized in that, The temperature sensing module and the control module are connected via a wireless communication module.

7. A park cooling flow balance regulation system as described in claim 6, characterized in that, The wireless communication module includes at least one of a 4G module, a 5G module, a WiFi module, a ZigBee module, and a Bluetooth module.

8. A park cooling flow balance regulation system as described in any one of claims 1-4, characterized in that, The control module includes a microcontroller, an ARM microcontroller, or a PLC controller.

9. A park cooling flow balance regulation system as described in claim 1, characterized in that, The control module is connected to the refrigeration unit (1) via a signal line.

10. A park cooling flow balance regulation system as described in claim 1, characterized in that, The control module is connected to the refrigeration unit (1) via a wireless communication module.

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