Cooling capacity-flow integrated control method, device and equipment for air conditioner chilled water system and medium

Abstract

The invention provides a cooling capacity-flow integrated control method, device and equipment for an air conditioner chilled water system and a medium. The control method comprises the steps that the real-time chilled water supply temperature and the real-time chilled water return temperature of all users in the air conditioner chilled water system are obtained; the air conditioner chilled water system comprises a cooling capacity-flow integrated control regulating valve arranged at the water inlet end of each user. Based on the real-time chilled water supply temperature and the real-time chilled water return temperature of each user, the real-time water supply and return temperature difference of each user is obtained; and on the basis of the real-time supply and return water temperature difference of each user, the opening degree of the cooling capacity-flow integrated control regulating valve is controlled. According to the control method, the opening degree of the cooling capacity-flow integrated control adjusting valve can be adjusted according to the real-time supply and return water temperature difference of all the users, so that chilled water in the air conditioner chilled water system is evenly distributed among all the users, the cooling capacity is evenly distributed, and it is ensured that the chilled water requirements of all the users are met in real time.

Description

Technical Field

[0001] The present invention belongs to the field of HVAC technology, and relates to a control method for an air-conditioning chilled water system, and in particular to a control method, device, equipment and medium for an air-conditioning chilled water system. Background Art

[0002] At present, the control methods of air-conditioning chilled water systems mostly adopt a single control method, such as a single pressure difference control method and a single temperature difference control method. Single pressure difference control is divided into constant pressure difference control and variable pressure difference control. Variable pressure difference control requires setting pressure sensors at each end, comparing and finding the most unfavorable end pressure difference at any time, and adjusting the pump speed according to its value. Therefore, the investment is relatively high, the control logic is cumbersome and prone to errors and loss of control, and the implementation is also difficult. In the actual application of constant pressure difference control, according to the different settings of the pressure difference sensor, it is divided into terminal dry pipe constant pressure difference control and starting dry pipe constant pressure difference control. However, these two variable pressure difference control methods cannot finely control the flow supply and demand of the system. Both have a certain lag, that is, the flow changes of other users cannot be quickly reflected in the pressure difference, resulting in the system cannot change the flow delivery in time, the control accuracy is insufficient, and power waste is caused. In addition, this single pressure difference control method requires the user end to be equipped with a precise fully automatic air conditioner, and the flow demand changes adjusted in real time by the user end are reflected in the changes in the pressure difference, thereby controlling the flow of the entire air-conditioning chilled water system. The single temperature difference control method is to adjust the speed of the chilled water pump according to the load change in the air conditioning chilled water system so that the system flow and load match. However, since the single temperature difference control method cannot detect the difference in load changes on different floors, it may cause insufficient chilled water pressure on some floors and cause air conditioning failure. In addition, the single temperature difference control method can only reflect the temperature change after the chilled water has been circulated, so the timeliness of control is poor. Although this method can stabilize the total supply or return water temperature of the system to a certain extent, it cannot accurately allocate the amount of chilled water required by each user and provide appropriate water pressure according to load changes.

[0003] In practical applications, whether it is a single pressure difference control method or a single temperature difference control method, it will lead to an unbalanced distribution of cooling capacity and flow among users in the air-conditioning chilled water system, which may easily lead to under-flow or over-flow for some users, resulting in return water temperature deviation, and insufficient or wasteful energy consumption; in addition, both methods are adjusted by uniformly controlling the frequency of the chilled water pump, and there will be a certain time interval, and there will be a lag in the flow supply, which will cause the system to be unable to change the flow delivery in a timely manner, and the control accuracy is insufficient, resulting in a waste of electricity. Summary of the invention

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an air-conditioning chilled water system cooling capacity-flow integrated control method, device, equipment and medium, which is used to solve the problem that the required chilled water cannot be accurately and evenly distributed to each user end in the prior art air-conditioning chilled water system control method, and the energy waste or failure to supply in time due to control lag and insufficient control accuracy.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention is implemented by including the following technical solutions.

[0006] In a first aspect, the present application provides a control method for an air-conditioning chilled water system, comprising: obtaining a real-time chilled water supply temperature and a real-time chilled water return temperature of each user in the air-conditioning chilled water system; wherein the air-conditioning chilled water system comprises a cooling capacity-flow integrated control regulating valve arranged at a water inlet end of each user; based on the real-time chilled water supply temperature and the real-time chilled water return temperature of each user, obtaining a real-time supply and return water temperature difference of each user; based on the real-time supply and return water temperature difference of each user, controlling the opening and closing degree of the cooling capacity-flow integrated control regulating valve.

[0007] In some embodiments of the first aspect of the present application, the control method also includes: obtaining the average total chilled water cooling capacity of all users within the unit mapping time period; wherein the air-conditioning chilled water system includes a chilled water pump; using the sum of the average total chilled water cooling capacity within the unit mapping time period and the set surplus cooling capacity as the supply demand cooling capacity within the next unit mapping time period; within the next unit mapping time period, adjusting the chilled water pump operating frequency based on the corresponding supply demand cooling capacity.

[0008] In some implementations of the first aspect of the present application, a target supply and return water temperature difference is set at 5-6°C for each user end in the air-conditioning chilled water system.

[0009] In some embodiments of the first aspect of the present application, obtaining the average total chilled water cooling capacity of all users within the unit mapping time period includes: obtaining the real-time chilled water flow of each user in the air-conditioning chilled water system; obtaining the real-time chilled water cooling capacity of each user based on the real-time supply and return water temperature difference and the real-time chilled water flow of each user; obtaining the average chilled water cooling capacity within the unit mapping time period based on the real-time chilled water cooling capacity data string of each user within the unit mapping time period; obtaining the average total chilled water cooling capacity of all users within the unit mapping time period based on the average chilled water cooling capacity of each user within the unit mapping time period.

[0010] In some implementations of the first aspect of the present application, the surplus cooling capacity is 5% to 10% of the total average chilled water cooling capacity.

[0011] In some embodiments of the first aspect of the present application, the unit mapping time period is 50 to 180 seconds. In the present application, the unit mapping time period can be any determined value between 50 and 180 seconds. In some embodiments of the first aspect of the present application, when the real-time supply and return water temperature difference at the user end exceeds the range of the target supply and return water temperature difference, the opening and closing degree of the cooling capacity-flow integrated control regulating valve is controlled to supply the required chilled water cooling capacity, and the real-time supply and return water temperature difference is kept within the range of the target supply and return water temperature difference.

[0012] In some implementations of the first aspect of the present application, the user is a floor, a communication room unit, or a communication equipment unit.

[0013] In some implementations of the first aspect of the present application, the air-conditioning chilled water system includes one or more users, and any one user is connected in parallel with any other user based on a chilled water pipeline.

[0014] In some embodiments of the first aspect of the present application, the air-conditioning chilled water system is provided with a thermometer at the water supply end and the return water end of each user to monitor the water supply temperature and the return water temperature in real time.

[0015] In some embodiments of the first aspect of the present application, the air-conditioning chilled water system includes at least two chillers connected in parallel.

[0016] In some embodiments of the first aspect of the present application, when the number of operating chillers in the air-conditioning chilled water system is ≥1, and the real-time total chilled water cooling capacity of the user increases to more than 85% of the rated cooling capacity of the current number of operating chillers, and remains unchanged per unit time, the number of operating chillers is controlled to increase to ensure that the real-time total chilled water cooling capacity is met.

[0017] In some embodiments of the first aspect of the present application, when the number of operating chillers in the air-conditioning chilled water system is greater than 1, and the total real-time chilled water cooling capacity of the users is less than 40% of the rated cooling capacity of the chillers with the current number of operating units, and remains unchanged per unit time, the number of operating chillers is controlled to be reduced.

[0018] In some embodiments of the first aspect of the present application, the air-conditioning chilled water system also includes a bypass pipeline, which is arranged in parallel with any chilled water pipeline serving the user; when only one chiller is in operation and the total real-time chilled water cooling capacity of each user per unit time is still less than 35% of the rated cooling capacity of the single chiller, the bypass pipeline is controlled to be connected to ensure the cooling capacity required for safe operation of the system.

[0019] In some embodiments of the first aspect of the present application, the cooling capacity required to ensure safe operation of the system is the difference between 35% of the rated cooling capacity of the chiller and the total real-time chilled water cooling capacity of the user.

[0020] In some embodiments of the first aspect of the present application, the unit time is 5 to 10 minutes.

[0021] In some embodiments of the first aspect of the present application, the air-conditioning chilled water system includes at least two chilled water pumps connected in parallel; the operating frequency and / or the number of operating units of the chilled water pumps in the next unit mapping time period are controlled according to the supply demand cooling capacity to ensure that the supply demand cooling capacity is met; when the supply demand cooling capacity is small and only the operating frequency of one water pump can be met, the water pump frequency is controlled according to the supply demand cooling capacity; when the supply demand cooling capacity is large and the highest operating frequency of one water pump still cannot be met, the number of water pumps that are turned on is controlled to increase to ensure that the supply demand cooling capacity is met.

[0022] In a second aspect of the present application, a control device for an air-conditioning chilled water system is provided, the control device comprising at least: a real-time chilled water supply temperature acquisition module, used to acquire the real-time chilled water supply temperature of each user in the air-conditioning chilled water system; a real-time chilled water return temperature acquisition module, used to acquire the real-time chilled water return temperature of each user in the air-conditioning chilled water system; a real-time supply and return water temperature difference acquisition module, used to acquire the real-time supply and return water temperature difference of each user in the air-conditioning chilled water system; a cooling capacity-flow integrated control regulating valve control module, used to control the opening and closing degree of the cooling capacity-flow integrated control regulating valve based on the real-time supply and return water temperature difference of each user.

[0023] In some embodiments of the second aspect of the present application, the control device also includes: an average total chilled water cooling capacity acquisition module, which is used to obtain the average total chilled water cooling capacity of all users in the unit mapping time period based on the average chilled water cooling capacity of each user in the unit mapping time period; a supply demand cooling capacity acquisition module, which is used to use the sum of the average total chilled water cooling capacity in the unit mapping time period and the set surplus cooling capacity as the supply demand cooling capacity in the next unit mapping time period; a chilled water pump operating frequency control module, which is used to adjust the operating frequency of the chilled water pump based on the corresponding supply demand cooling capacity in the next unit mapping time period.

[0024] In some embodiments of the second aspect of the present application, the control device also includes: a real-time chilled water flow acquisition module, which is used to obtain the real-time chilled water flow of each user in the air-conditioning chilled water system; a real-time chilled water cooling capacity acquisition module, which is used to obtain the real-time chilled water cooling capacity of each user in the air-conditioning chilled water system based on the real-time supply and return water temperature difference and the real-time chilled water flow of each user; an average chilled water cooling capacity acquisition module, which is used to obtain the average chilled water cooling capacity within the unit mapping time period based on the real-time chilled water cooling capacity data string of each user within the unit mapping time period.

[0025] In some embodiments of the second aspect of the present application, the control device further includes a surplus cooling capacity acquisition module for acquiring the surplus cooling capacity in the next unit mapping time period based on the average total chilled water cooling capacity of the unit mapping time.

[0026] In some embodiments of the second aspect of the present application, the control device also includes a chiller operating unit number control module, which is used to control the operating number of the chiller according to the real-time total refrigeration water cooling capacity to ensure that the real-time total refrigeration water cooling capacity is met.

[0027] In some embodiments of the second aspect of the present application, the control device also includes a chilled water pump operating number control module, which is used to control the operating number of chilled water pumps in the next mapping time period according to the supply demand cooling to ensure that the supply demand cooling is met.

[0028] In some embodiments of the second aspect of the present application, the control device also includes a bypass line control module, which is used to control the bypass line connection to ensure the chilled water cooling capacity required for safe operation of the system when only one chiller is operating and the average total chilled water cooling capacity is still less than 35% of the rated cooling capacity of the chiller.

[0029] In some embodiments of the second aspect of the present application, the cooling capacity required to ensure safe operation of the system is the difference between 35% of the rated cooling capacity of the chiller and the total cooling capacity of the real-time chilled water.

[0030] According to a third aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and the computer program is used to implement the control method of the present invention when executed by a processor.

[0031] In a fourth aspect of the present application, an electronic device is provided, comprising: a processor, a memory and a computer program; the memory is communicatively connected to the processor, the memory stores the computer program, and the processor executes the computer program to implement the control method described in the present invention.

[0032] As described above, the control method of the present application can adjust the opening and closing degree of the cooling capacity-flow integrated control regulating valve according to the real-time supply and return water temperature difference of each user, so that the chilled water in the air-conditioning chilled water system can be evenly distributed among the users, achieving balanced cooling capacity distribution to ensure that the chilled water needs of each user are met in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Shown is a flow chart of a control method for an air-conditioning chilled water system in one embodiment of the present application;

[0034] Figure 2Shown is a flow chart of another embodiment of a method for controlling a chilled water pump of an air-conditioning chilled water system in the present application;

[0035] Figure 3 Shown is a flow chart of another embodiment of obtaining the sum of average chilled water cooling capacity of all users within a unit mapping time period in an air-conditioning chilled water system in the present application;

[0036] Figure 4 Shown is a schematic diagram of cooling capacity control for each unit mapping time period in one embodiment of the present application;

[0037] Figure 5 Shown is a schematic diagram of an application scenario of a control method for an air-conditioning chilled water system in one embodiment of the present application;

[0038] Figure 6 Shown is a schematic diagram of an application scenario of a single user in another embodiment of the control method of an air-conditioning chilled water system in the present application;

[0039] Figure 7 Shown is a schematic diagram of an application scenario of a single room in a user in another embodiment of the control method of an air-conditioning chilled water system in the present application;

[0040] Figure 8 Shown is a flow chart of the control method of the air-conditioning chilled water system in one embodiment of the present application when judging the number of chillers in operation;

[0041] Fig. 9 Shown is a structural schematic diagram of an energy-saving control device for an air-conditioning chilled water system in the present application in one embodiment;

[0042] Fig.10 Shown is a schematic structural diagram of another embodiment of the energy-saving control device for an air-conditioning chilled water system in the present application;

[0043] Fig.11 Shown is a structural schematic diagram of an energy-saving control device for an air-conditioning chilled water system in another embodiment of the present application;

[0044] Fig.12 Shown is a schematic diagram of the structure of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0045] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0046] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0047] Furthermore, as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprises", "includes", "includes" indicate the presence of the described features, operations, elements, components, items, types, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, operations, elements, components, items, types, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination.

[0048] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution in the embodiments of the present invention is further described in detail through the following embodiments and in combination with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the invention.

[0049] In response to the technical problems existing in the prior art, the present application first provides a control method for an air-conditioning chilled water system, by obtaining the real-time chilled water supply temperature and the real-time chilled water return temperature of each user in the air-conditioning chilled water system; wherein the air-conditioning chilled water system comprises a cooling capacity-flow integrated control regulating valve arranged at the water inlet end of each user; based on the real-time chilled water supply temperature and the real-time chilled water return temperature of each user, the real-time supply and return water temperature difference of each user is obtained; based on the real-time supply and return water temperature difference of each user, the opening and closing degree of the cooling capacity-flow integrated control regulating valve is controlled.

[0050] This application applies a cooling capacity-flow integrated control regulating valve to an air-conditioning chilled water system for the first time. According to the real-time supply and return water temperature difference at each user end, the opening and closing degree of the cooling capacity-flow integrated control regulating valve is adjusted in real time, so that the chilled water in the air-conditioning chilled water system can be evenly distributed among the users, thereby achieving balanced cooling capacity distribution. Compared with the flow control in the prior art, this application controls the cooling capacity, so that the chilled water supply at the user end is more accurate, and is adjusted in real time according to the temperature difference, so that underflow or overflow will not occur, thereby achieving real-time, reasonable and balanced distribution of chilled water in the entire air-conditioning chilled water system, and saving more energy.

[0051] In order to facilitate understanding of the embodiments of the present application, first Figure 1 Detailed description. Figure 1 A flow chart of a control method for an air conditioning chilled water system in an embodiment of the present invention is shown, comprising the following steps:

[0052] S11, obtaining the real-time chilled water supply temperature and the real-time chilled water return temperature of each user in the air-conditioning chilled water system.

[0053] Among them, the real-time chilled water supply temperature of each user is the chilled water temperature on the water inlet pipe after being cooled by the chiller and before flowing through each user, and the real-time chilled water return temperature of each user is the chilled water temperature on the chilled water outlet pipe after flowing through each user.

[0054] S12, based on the real-time chilled water supply temperature and the real-time chilled water return temperature of each user, obtaining the real-time supply and return water temperature difference of each user.

[0055] The supply and return water temperature difference is the difference between the temperature of the chilled water after flowing through each user and the temperature of the chilled water after being cooled by the chiller.

[0056] S13, based on the real-time supply and return water temperature difference of each user, controlling the opening and closing degree of the cooling capacity-flow integrated control regulating valve.

[0057] The control method of the air-conditioning chilled water system of the present application ensures the on-demand distribution of chilled water among users in the entire air-conditioning chilled water system, and can effectively reduce the delay and unrefinedness caused by the single pressure difference control or temperature control in the prior art. In this case, since the cooling capacity-flow integrated control regulating valve changes in real time according to the real-time supply and return water temperature difference of each user, the chilled water demand of each user can be met in real time. Therefore, the water pump does not need to change in real time, making the air-conditioning chilled water system run more smoothly.

[0058] In some optional embodiments, the control method also includes: obtaining the average total chilled water cooling capacity of all users within the unit mapping time period, and using the sum of the average total chilled water cooling capacity within the unit mapping time period and the set surplus cooling capacity as the supply demand cooling capacity within the next unit mapping time period, thereby ensuring that the supply demand cooling capacity in the air-conditioning chilled water system changes at intervals of the unit mapping time period.

[0059] Figure 2 A flow chart showing a method for controlling a chilled water pump in an air-conditioning chilled water system according to an embodiment of the present invention is provided, comprising the following steps:

[0060] S21, obtaining the average total chilled water cooling capacity in the unit mapping time period, and taking the sum of the average total chilled water cooling capacity in the unit mapping time period and the set surplus cooling capacity as the supply demand cooling capacity in the next unit mapping time period.

[0061] S22, in the next unit mapping time period, adjusting the operating frequency of the chilled water pump based on the corresponding supply demand cooling capacity.

[0062] In some optional embodiments, obtaining the average total chilled water cooling capacity of all users within the unit mapping time period includes: obtaining the real-time chilled water flow of each user in the air-conditioning chilled water system; obtaining the real-time chilled water cooling capacity of each user based on the real-time supply and return water temperature difference and the real-time chilled water flow of each user; obtaining the average chilled water cooling capacity within the unit mapping time period based on the real-time chilled water cooling capacity data string of each user within the unit mapping time period; obtaining the average total chilled water cooling capacity of all users within the unit mapping time period based on the average chilled water cooling capacity of each user within the unit mapping time period.

[0063] Figure 3 A flow chart of obtaining the sum of the average chilled water cooling capacity of all users within the unit mapping time period in a control method of an air conditioning chilled water system in an embodiment of the present invention is shown, including the following steps:

[0064] S31, obtaining the real-time chilled water supply temperature, real-time chilled water return temperature and real-time chilled water flow rate of each user in the air-conditioning chilled water system.

[0065] Among them, the real-time chilled water supply temperature of each user is the chilled water temperature on the water inlet pipe after being cooled by the chiller and before flowing through each user, the real-time chilled water return temperature of each user is the chilled water temperature on the chilled water outlet pipe after flowing through each user, and the real-time chilled water flow rate of each user is the real-time chilled water flow rate flowing through each user.

[0066] S32, based on the real-time chilled water supply temperature and the real-time chilled water return temperature of each user, obtaining the real-time supply and return water temperature difference of each user.

[0067] The supply and return water temperature difference is the difference between the temperature of the chilled water after flowing through each user and the temperature of the chilled water after being cooled by the chiller.

[0068] S33, based on the real-time supply and return water temperature difference and the real-time chilled water flow rate of each user, obtain the real-time chilled water cooling capacity of each user.

[0069] The cooling capacity mentioned in this application is the actual chilled water consumption at the user end, that is, the chilled water energy consumption.

[0070] Specifically, based on the cooling capacity-flow calculation formula P=Q×c×ΔT, the real-time chilled water cooling capacity of each user is calculated, where P is the chilled water cooling capacity (kW) and Q is the chilled water flow (m 3 / h), c is the specific heat capacity of water (kJ / kg·℃), ΔT is the supply and return water temperature difference (℃). Since the unit of the monitored chilled water flow is m 3 / h. When using the above formula for actual calculation, the unit of chilled water flow needs to be changed from m 3 / h is converted to L / s, since 1000L = 1m 3 , 1h=3600s, so m 3 To convert / h into L / s, you need to use the formula P=Q×c×ΔT / 3.6 to get the final cooling capacity P value.

[0071] S34, obtaining the average refrigerated water cooling capacity within the unit mapping time period based on the real-time refrigerated water cooling capacity data string of each user within the unit mapping time period.

[0072] Specifically, the average of multiple real-time refrigeration water cooling capacities of each user obtained within the unit mapping time period is taken, that is, the average refrigeration water cooling capacity of each user within the unit mapping time period is obtained.

[0073] S35: Based on the average refrigeration water cooling capacity of each user in the unit mapping time period, the sum of the average refrigeration water cooling capacity of all users in the unit mapping time period is obtained.

[0074] Specifically, the average refrigeration water cooling capacity of each user in the unit mapping time period is summed up, that is, the sum of the average refrigeration water cooling capacity of all users in the unit mapping time period is obtained.

[0075] The control method of the air-conditioning chilled water system provided in the present embodiment obtains the chilled water supply temperature, real-time chilled water return temperature and chilled water flow of each user in the air-conditioning chilled water system in real time, and obtains the real-time supply and return temperature difference of each user based on the real-time chilled water supply temperature and real-time chilled water return temperature of each user; and obtains the real-time chilled water cooling capacity of each user based on the real-time supply and return temperature difference and real-time chilled water flow of each user, and obtains the average chilled water cooling capacity in the unit mapping time period based on the real-time chilled water cooling capacity data string of each user in the unit mapping time period, obtains the sum of the average chilled water cooling capacity of all users in the unit mapping time period based on the average chilled water cooling capacity of each user in the unit mapping time period, and uses the sum of the average chilled water cooling capacity in the unit mapping time period and the set surplus cooling capacity as the supply demand cooling capacity in the next unit mapping time period, thereby adjusting the working frequency of the chilled water pump according to the supply demand cooling capacity; compared with the prior art, the control method in the present application controls the chilled water pump frequency according to the chilled water cooling capacity demand of each user, which can greatly reduce the energy consumption of the chilled water pump and reduce energy waste.

[0076] It should be noted that the water pump frequency may be controlled by cooling capacity control as described in the present application or by flow control.

[0077] In some optional embodiments, by monitoring the real-time chilled water flow and real-time chilled water return temperature of the user, and based on the real-time chilled water return temperature of each user, the real-time supply and return water temperature difference of each user is obtained, and based on the real-time supply and return water temperature difference of each user, the opening and closing degree of the cooling capacity-flow integrated control regulating valve is controlled to meet the chilled water flow requirements of each user, thereby realizing on-demand allocation of chilled water flow in the entire air-conditioning chilled water system and achieving supply and demand balance.

[0078] In a specific embodiment, the opening and closing degree of the cooling capacity-flow integrated control regulating valve changes according to the real-time supply and return water temperature difference of each user. When the temperature difference is large, the opening and closing degree of the cooling capacity-flow integrated control regulating valve becomes larger, and when the temperature difference is small, the opening and closing degree of the cooling capacity-flow integrated control regulating valve becomes smaller.

[0079] like Figure 4 As shown, it is a schematic diagram of the chilled water cooling capacity control in each unit mapping time period in this embodiment. Figure 4 The middle horizontal axis is the time axis, and the unit mapping time period is t. The sum of the average chilled water cooling capacity and the surplus cooling capacity of all users in the first unit mapping time period (Pt+△P) is used as the supply and demand cooling capacity of the next unit mapping time period; the sum of the average chilled water cooling capacity and the surplus cooling capacity of all users in the next time period (P2t+△P) is used as the supply and demand cooling capacity of the next time period, and so on.

[0080] In a specific embodiment, the unit mapping time period is any determined value in the range of 50 to 180 seconds, such as 50 to 80 seconds, 80 to 100 seconds, 100 to 150 seconds, or 150 to 180 seconds. When the unit mapping time period is too long (such as 10 minutes), the supply and demand flow rate change time will be too long, and the user's needs cannot be met in time; when the unit mapping time period is too short (such as 3 seconds, 10 seconds), the supply and demand flow rate change time will be too short, causing the entire air-conditioning chilled water system to calculate and change the water flow too frequently, reducing the system stability index and consuming a lot of energy. It should be noted that each unit mapping time period can also be manually set and adjusted, and can be determined based on the change in the average total chilled water cooling capacity of all users' histories, such as the change speed and change range of the average total chilled water cooling capacity of all users' histories at similar times. If the change is fast and the change range is large, a shorter or smaller unit mapping time period can be set.

[0081] In a more specific embodiment, the unit mapping time period is specifically 60 seconds, and the sum of the average chilled water cooling capacity of all users obtained in the previous 60 seconds and the sum of the surplus cooling capacity is used as the actual supply demand flow in the next 60 seconds.

[0082] In some optional embodiments, the surplus cooling capacity is 5% to 10% of the average total chilled water cooling capacity, and the surplus cooling capacity is fixed in the unit mapping time period. The value of the surplus cooling capacity in the next unit mapping time period is 5% to 10% of the average total chilled water cooling capacity in the previous unit mapping time period, such as 5%, 6%, 7%, 8%, 9%, 10%. When the value of the surplus cooling capacity is too small (such as 1%), the chilled water cooling capacity supplied cannot meet the user's demand when the chilled water cooling capacity demand at the user end increases; when the value of the surplus cooling capacity is too small (such as 15%), the total chilled water cooling capacity supplied greatly exceeds the chilled water cooling capacity demand at the user end, resulting in a waste of cooling capacity.

[0083] In some optional embodiments, a target supply and return water temperature difference is set for each user end in the air-conditioning chilled water system. When the real-time supply and return water temperature difference at the user end exceeds the range of the target supply and return water temperature difference, the opening and closing degree of the cooling capacity-flow integrated control regulating valve is controlled to supply the required chilled water flow rate, thereby keeping the real-time supply and return water temperature difference within the range of the target supply and return water temperature difference.

[0084] In a specific embodiment, the target supply and return water temperature difference is 5 to 6° C. When the setting range of the target supply and return water temperature difference is too small (such as 5 to 5.2° C.), the opening and closing degree of the cooling capacity-flow integrated control regulating valve will change too quickly, which is not conducive to the stable operation of the system. When the setting range of the target supply and return water temperature difference is too large (such as 5 to 8° C.), the opening and closing degree of the cooling capacity-flow integrated control regulating valve will change too slowly, and the demand for chilled water flow at the user end cannot be met in real time.

[0085] In a more specific embodiment, when the real-time supply and return water temperature difference at the user end is less than 5°C, the opening of the cooling capacity-flow integrated control regulating valve is controlled to be less than the current opening, so as to control the chilled water flow rate flowing through the user to decrease, so that the real-time supply and return water temperature difference increases to within the target supply and return water temperature difference range.

[0086] In a more specific embodiment, when the real-time supply and return water temperature difference at the user end is greater than 6°C, the opening of the cooling capacity-flow integrated control regulating valve is controlled to be greater than the current opening to control the increase in the chilled water flow rate flowing through the user, so that the real-time supply and return water temperature difference is reduced to within the target supply and return water temperature difference range.

[0087] See also Figure 5 , shown is a schematic diagram of an application scenario of the control method of the air-conditioning chilled water system in one embodiment; the air-conditioning chilled water system includes users, regulating valves, thermometers, chilled water pumps, chillers, bypass valves and a control center; the regulating valve is a cooling capacity-flow integrated control regulating valve, and is arranged on the chilled water pipeline of each user to monitor the real-time chilled water flow of each user and regulate the real-time chilled water flow flowing through each user by controlling the opening of the regulating valve, the chiller is connected to the chilled water pump to refrigerate the water pumped out by the chilled water pump, the bypass valve is arranged on the bypass pipeline of the air-conditioning chilled water system, and the control center serves as a monitoring platform for collecting the real-time chilled water return temperature and real-time chilled water flow of each user to adjust the working frequency of the chilled water pump based on the supply demand cooling capacity.

[0088] In some optional embodiments, the air-conditioning chilled water system includes one or more users, and any one user is connected in parallel with any other user based on a chilled water pipeline.

[0089] In a specific embodiment, the user is a floor, a communication room unit or a communication equipment unit.

[0090] If the user is a floor, each floor user can also contain one or more rooms.

[0091] In a more specific embodiment, the cooling capacity-flow integrated control regulating valve can be set on the water inlet pipe of the floor, and can also be set on the water inlet pipe of each room on the floor to achieve precise control of each room.

[0092] In another more specific embodiment, Figure 6As shown, a room is taken as an example of a user, the room contains several working hosts 603, an air-tight channel 604 is set between every two rows of hosts, the room also contains several air conditioners 605, the room also contains a water inlet pipe 602, a water outlet pipe 601 and a cooling capacity-flow integrated control regulating valve 606; due to the heat dissipation of the host, the hot air flow formed enters the air-tight channel 604, and then is sucked into the air conditioner and cooled by the chilled water pipe at the air conditioner for heat exchange, forming cold air to be sent out again. As a result, the air conditioning system forms an air circulation, and the temperature of the chilled water in the water inlet pipe 602 increases after heat exchange, flows into the water outlet pipe 601, and is cooled again by the chiller before flowing into the water supply pipe. As a result, the air conditioning chilled water system forms a water circulation. The cooling capacity-flow integrated control regulating valve 606 adjusts its opening and closing degree in real time according to the supply and return water temperature difference to accurately meet the user's demand for chilled water. The hot air in the air circulation is converted into cold air through the water circulation. At the same time, the chilled water in the water circulation is further cooled after the temperature of the chilled water increases. The air circulation and the water circulation interact with each other to achieve a dynamic balance regulation effect.

[0093] In some other embodiments, further Figure 7 Taking the water circulation and air circulation of a single room in the example, the temperature of the working host increases due to data calculation, etc., and the air conditioner blows out cold air to provide a low-temperature environment to cool down the working host. The air blown out of the working host is hot air. The hot air blown out of each working host enters the closed channel. The hot air in the closed channel is sucked into the air conditioner, and after heat exchange with the corresponding chilled water pipe inside the air conditioner, it is turned into cold air again and sent out, thus forming an air circulation between the host and the air conditioner. In addition, the chilled water in the water supply pipeline corresponding to the air conditioner becomes hot water and enters the return water pipeline, and then enters the water supply pipeline again after being cooled by the chiller, thus forming a water circulation. In some optional embodiments, the air supply temperature of the air conditioner is constant.

[0094] In some optional embodiments, the constant air supply temperature is selected from any certain value between 21° C. and 23° C. The constant air supply temperature is artificially set.

[0095] In some optional embodiments, the air conditioner at each user end is provided with a switch valve, and the air conditioner can automatically adjust the opening and closing degree of the switch valve according to the supply and return air temperatures to meet the cooling needs.

[0096] In some optional embodiments, the air conditioning end does not contain a processor and a regulating valve, and cannot automatically control the flow of chilled water.

[0097] In some optional embodiments, the cooling capacity-flow integrated control regulating valve is arranged at each user's water inlet end of the air-conditioning chilled water system to monitor the chilled water flow at each user end in real time, and adjust the chilled water flow passing through the user by controlling the opening and closing degree of the regulating valve to meet the user's real-time required chilled water cooling capacity.

[0098] In some optional embodiments, the air-conditioning chilled water system is provided with a thermometer at each user's return water end to monitor the return water temperature in real time.

[0099] In some optional embodiments, the water chiller is used to refrigerate water pumped out by the chilled water pump, and the temperature of the chilled water after being cooled by the water chiller is any determined value between 15 and 18°C.

[0100] In a specific embodiment, the cooling water temperature of the chiller is 16°C. Figure 5 It shows that the temperature of the air-conditioning chilled water cooled by the chiller is constant at 16°C, that is, the air-conditioning chilled water supply temperature flowing through each user is 16°C.

[0101] In another specific embodiment, since the cooling water temperature of the chiller increases slowly when it is turned on and off, it is necessary to set a thermometer on the water supply pipeline to monitor the water supply temperature in real time, and set a thermometer on the water outlet pipeline of each user to monitor the chilled water return temperature of each user in real time. The real-time supply and return water temperature difference of each user can be calculated, and the opening and closing degree of the cooling capacity-flow integrated control regulating valve can be adjusted based on the real-time supply and return water temperature difference to ensure that the supply and return water temperature difference is within the set range.

[0102] In a specific embodiment, in the next unit mapping time period, when the operating frequency of the chilled water pump is adjusted based on the corresponding supply demand cooling capacity, the control center calculates the current or voltage signal for the water pump to meet the demand in the next unit mapping time period based on the corresponding supply demand cooling capacity in the previous unit mapping time period. After receiving the current or voltage signal, the chilled water pump operates at the corresponding operating frequency to provide chilled water with supply demand cooling capacity into the air-conditioning chilled water system.

[0103] In the cloud computing communication room or intelligent computing center scenario involved in this application, the host temperature changes in real time due to the change in the operating status of each user-side working host, resulting in the real-time change in the temperature of the chilled water flowing through the user. Since the water supply temperature is constant, in order to maintain the supply and return water temperature difference within the set range, the control center controls the opening and closing degree of the cooling capacity-flow integrated control regulating valve so that the chilled water flow flowing through the user can maintain the supply and return water temperature difference within the set range. Figure 5As shown, the control center obtains the real-time chilled water return temperature of each user monitored by the thermometer, and calculates the real-time supply and return water temperature difference of each user. When the real-time supply and return water temperature difference of each user exceeds the set target supply and return water temperature difference range, the control center controls the opening of the cooling capacity-flow integrated control regulating valve to increase or decrease to supply the chilled water flow required by the user, so that the supply and return water temperature difference is maintained within the set range; based on the real-time supply and return water temperature difference and the real-time chilled water flow of each user, the real-time chilled water cooling capacity of each user is obtained, based on the real-time chilled water cooling capacity data string of each user in the unit mapping time period, the average chilled water cooling capacity in the unit mapping time period is obtained, based on the average chilled water cooling capacity of each user in the unit mapping time period, the sum of the average chilled water cooling capacity of all users in the unit mapping time period is obtained, and the sum of the average chilled water cooling capacity in the unit mapping time period and the set surplus cooling capacity is used as the supply demand cooling capacity in the next unit mapping time period; the control center obtains the supply demand cooling capacity by calculation, and converts the cooling capacity signal into a current or voltage signal, and the current or voltage signal can directly correspond to the frequency value of the chilled water pump, thereby controlling and adjusting the operating frequency of the chilled water pump.

[0104] In some optional embodiments, when the number of operating chillers in the air-conditioning chilled water system is ≥1, and the real-time total chilled water cooling capacity of the users increases to more than 85% of the rated cooling capacity of the current number of operating chillers, and remains unchanged per unit time, the number of operating chillers is controlled to increase to ensure that the real-time total chilled water cooling capacity is met.

[0105] In some optional embodiments, when the number of operating chillers in the air-conditioning chilled water system is ≥2, and the real-time total chilled water cooling capacity is less than 40% of the rated cooling capacity of the operating chillers, and remains unchanged per unit time, the number of operating chillers is controlled to be reduced.

[0106] See also Figure 8 , which is a schematic diagram of the process of judging the number of chillers in operation, including the following steps:

[0107] S810, obtaining the current real-time total chilled water cooling capacity;

[0108] S820, by formula: Calculate the N1 value, and use the formula:

[0109] Calculate the N2 value;

[0110] S830, comparing the N1 value and the N2 value with the current number of chillers in operation, N;

[0111] S840, when N1 value>N value, determine whether the duration when the current N1 value is greater than the N value is greater than the unit time;

[0112] S841, if yes, then control the number of running chillers to the current N1 value;

[0113] S842, if not, keep the number of running chillers unchanged;

[0114] S850, when N2 value is less than N value, determine whether the duration when the current N2 value is less than N value is greater than the unit time;

[0115] S851, if yes, then control the number of running chillers to the current N2 value;

[0116] S852: If not, keep the number of running chillers unchanged.

[0117] It should be noted that N, N1 and N2 must be integers. When encountering non-integer values, they are all incremented by 1, and the minimum value of N, N1 and N2 is 1. For example, when N is calculated to be 2.1, the final value of N is 3.

[0118] In some optional embodiments, the unit time is 5 to 10 minutes, for example, 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, and 10 minutes. When the unit time is too short (such as 1 minute), frequent adjustment of the chiller will be caused, which is not conducive to the stable operation of the system. When the unit time is too long (such as 30 minutes), the total cooling capacity of the real-time chilled water at the user end cannot be met, resulting in a lack or waste of cooling capacity.

[0119] In a specific embodiment, the unit time is 5 minutes. Taking the current real-time refrigerated water cooling capacity sum greater than the previous real-time refrigerated water cooling capacity sum, the current N1 value is greater than the N value and the duration is greater than 5 minutes as an example, the number of running chillers is controlled to be the current N1 value.

[0120] In another specific embodiment, the unit time is 5 minutes. Taking the current real-time refrigerated water cooling capacity sum greater than the previous real-time refrigerated water cooling capacity sum, and the current N1 value is greater than the N value for 1 minute as an example, the current number of operating chillers remains unchanged.

[0121] In a specific embodiment, the working state of the chillers is controlled by a control center, and the working state refers to running or not running.

[0122] In some optional embodiments, the air conditioning chilled water system further includes a bypass pipeline, which is arranged in parallel with any chilled water pipeline acting on the user; when only one chiller is in operation and the sum of the real-time chilled water cooling capacity of each user per unit time is still less than 35% of the rated cooling capacity of the single chiller, the bypass pipeline is controlled to be connected to ensure the cooling capacity required for safe operation of the system. The bypass pipeline is connected to divide the excess chilled water cooling capacity, and the bypass pipeline and the chilled water pump are circulated to avoid damage caused by excessive pressure on the chilled water pipeline at the end user.

[0123] In a more specific embodiment, the control center calculates the excess cooling capacity according to the difference between 35% of the rated cooling capacity rate of a single chiller and the total real-time chilled water cooling capacity of the user, and controls the opening of the bypass valve of the bypass pipeline according to the excess cooling capacity. Specifically, the greater the excess cooling capacity, the greater the opening of the bypass valve.

[0124] It should be noted that the opening range of the bypass valve in the bypass pipeline is 0 to 25%. This is because when the bypass valve is opened too large, a large amount of chilled water will mix with the hot water return water flowing through the user, and the return water temperature will decrease accordingly. When the return water temperature drops too low (for example, less than or equal to 17°C), the chiller will stop refrigerating or even be damaged.

[0125] In a specific embodiment, the unit time is 5 to 10 minutes.

[0126] In some optional embodiments, the air-conditioning chilled water system includes at least two chilled water pumps connected in parallel; the frequency and the number of operating chilled water pumps in the next unit mapping time period are controlled according to the supply demand cooling capacity.

[0127] In a specific embodiment, the operating frequency and operating state of any chilled water pump are controlled by the control center, and the operating state refers to running or not running.

[0128] In a specific embodiment, when the supply demand cooling capacity is so small that it can be met by the operating frequency of only one water pump: the control center controls one chilled water pump in the air-conditioning chilled water system to operate, and other chilled water pumps do not operate, and adjusts the operating frequency of the running chilled water pump according to the supply demand cooling capacity; the specific adjustment method of the operating frequency of a running chilled water pump is: when the calculated supply demand cooling capacity of the next unit mapping time period is greater than the water cooling capacity of the current air-conditioning chilled water system, increase the water pump frequency in the next unit mapping time period; when the calculated supply demand cooling capacity of the next unit mapping time period is less than the water cooling capacity of the current air-conditioning chilled water system, reduce the chilled water pump frequency in the next unit mapping time period.

[0129] It should be noted that in actual work, the energy consumption of a single chilled water pump is higher when the operating frequency is at the highest operating frequency; therefore, when the operating frequency of the chilled water pump reaches more than 90% of the highest operating frequency and runs stably at this frequency for a certain period of time (for example, 3 to 10 minutes), the number of water pumps that are turned on is controlled to increase in order to reduce the operating frequency of a single water pump and save energy.

[0130] It should be noted that the rated frequency of a conventional water pump is 50Hz, and it is recommended that the maximum operating frequency is 2 to 5Hz less than the rated frequency. In a specific embodiment, when the supply demand for cooling increases, and the maximum operating frequency of one or more chilled water pumps still cannot meet the demand: the control center determines the operating frequency within a certain period of time. If it is determined that the operating frequency of the chilled water pump within the period of time is greater than the chilled water cooling corresponding to 85% of the maximum operating frequency of the chilled water pump, the control center increases the number of chilled water pumps that are turned on to meet the supply demand for cooling.

[0131] It should be noted that the safe operating frequency of a single chilled water pump is within the range of 20 to 30 Hz. In actual operation, the minimum operating frequency of the chilled water pump is generally 2 to 5 Hz greater than the safe operating frequency. In a specific embodiment, when the supply demand exceeds the demand cold capacity, and the minimum operating frequency of multiple chilled water pumps still exceeds the supply demand cold capacity: the control center determines its operating frequency within a certain period of time. If it is determined that the operating frequency of the chilled water pump is less than 1.2 times the minimum operating frequency within the period of time, the control center reduces the number of chilled water pumps turned on to meet the supply and demand balance. The minimum number of chilled water pumps in operation is greater than or equal to 1.

[0132] In a specific embodiment, when a water pump in operation fails, the control center can also monitor the working status of the chilled water pump in real time to determine whether it has failed. When it is determined that it has failed, other chilled water pumps in parallel will be controlled to be in working state to meet the cooling demand of the system.

[0133] In this embodiment, the supply and return water temperatures of each user end change in real time. The control center determines whether the supply and return water temperatures exceed the set target supply and return water temperature range based on the changes in the supply and return water temperatures. If it is determined that the supply and return water temperature exceeds the set target supply and return water temperature range, the control center adjusts the opening of the cooling capacity-flow integrated control regulating valve to increase or decrease so as to maintain the supply and return water temperatures within the set range; therefore, the chilled water flow rate flowing through each user changes in real time; the frequency of the chilled water pump is fully automatically controlled by the control center, and the control center adjusts the operating frequency of the chilled water pump according to the supply and demand cooling capacity; in this embodiment, the control center comprehensively controls the opening and closing degree of the cooling capacity-flow integrated control regulating valve, controls the operating frequency and the number of working units of the chilled water pump, controls the number of working units of the chiller, and controls the opening and closing degree of the bypass valve, so as to realize the on-demand distribution of the chilled water cooling capacity at the user end, achieve the supply and demand balance of the cooling capacity of the entire air-conditioning chilled water system, and save energy.

[0134] In response to the technical problems existing in the prior art, the present application also provides a control device for an air-conditioning chilled water system.

[0135] See also Fig. 9 The control device of the air-conditioning chilled water system at least includes: a real-time chilled water supply temperature acquisition module 901, a real-time chilled water return temperature acquisition module 902, a real-time supply and return water temperature difference acquisition module 903, and a cooling capacity-flow integrated control regulating valve control module 904.

[0136] Among them, the real-time chilled water supply temperature acquisition module 901 is used to obtain the real-time chilled water supply temperature of each user in the air-conditioning chilled water system; the real-time chilled water return temperature acquisition module 902 is used to obtain the real-time chilled water return temperature of each user in the air-conditioning chilled water system; the real-time supply and return water temperature difference acquisition module 903 is used to obtain the real-time supply and return water temperature difference of each user in the air-conditioning chilled water system; the cooling capacity-flow integrated control regulating valve control module 904 is used to control the opening and closing degree of the cooling capacity-flow integrated control regulating valve based on the real-time supply and return water temperature difference of each user.

[0137] See also Fig.10 The control device of the air-conditioning chilled water system further includes: an average chilled water cooling capacity sum acquisition module 908, a surplus cooling capacity acquisition module 909, a supply demand cooling capacity acquisition module 910 and a control module 911.

[0138] Among them, the average total chilled water cooling capacity acquisition module 908 is used to obtain the average total chilled water cooling capacity of all users in the unit mapping time period based on the average chilled water cooling capacity of each user in the unit mapping time period; the surplus cooling capacity acquisition module 909 is used to obtain the surplus cooling capacity in the next unit mapping time period based on the average total chilled water cooling capacity of the unit mapping time; the supply and demand cooling capacity acquisition module 910 is used to use the sum of the average total chilled water cooling capacity in the unit mapping time period and the set surplus cooling capacity as the supply and demand cooling capacity in the next unit mapping time period; the control module 911 at least includes a chilled water pump operating frequency control module 911a, which is used to adjust the operating frequency of the chilled water pump based on the corresponding supply and demand cooling capacity in the next unit mapping time period.

[0139] In some optional embodiments, the control module 911 further includes a chilled water pump operating number control module 911b, which is used to control the operating number of chilled water pumps in the next unit mapping time period according to the supply demand cooling capacity to ensure that the supply demand cooling capacity is met.

[0140] In some optional embodiments, the control module 911 further includes a chiller operating unit number control module 911c, which is used to control the operating number of the chillers according to the real-time total refrigeration water cooling capacity to ensure that the real-time total refrigeration water cooling capacity is met.

[0141] In some optional embodiments, the control module 911 further includes a bypass line control module 911d, which is used to control the bypass line connection to ensure the cooling capacity required for safe operation of the system when only one chiller is operating and the average total chilled water cooling capacity is still less than 35% of the rated cooling capacity of the chiller.

[0142] In some optional embodiments, the cooling capacity required to ensure safe operation of the system is the difference between 35% of the rated cooling capacity of the chiller and the total real-time chilled water cooling capacity of the user.

[0143] See also Fig.11 The control device of the air-conditioning chilled water system also includes: a real-time chilled water flow acquisition module 905, a real-time chilled water cooling capacity acquisition module 906, and an average chilled water cooling capacity acquisition module 907.

[0144] Among them, the real-time chilled water flow acquisition module 905 is used to obtain the real-time chilled water flow of each user in the air-conditioning chilled water system; the real-time chilled water cooling capacity acquisition module 906 is used to obtain the real-time chilled water flow of each user in the air-conditioning chilled water system based on the real-time supply and return water temperature difference and the real-time chilled water flow of each user; the average chilled water cooling capacity acquisition module 907 is used to obtain the average chilled water cooling capacity within the unit mapping time period based on the real-time chilled water cooling capacity data string of each user within the unit mapping time period;

[0145] In some optional embodiments, the real-time chilled water supply temperature acquisition module 901 acquires the real-time water supply temperature measured by a thermometer disposed on the water inlet pipeline of the air-conditioning chilled water system.

[0146] In some optional embodiments, the real-time chilled water return temperature acquisition module 902 acquires the real-time return water temperature measured by a thermometer disposed on the user-side return water pipeline.

[0147] In some optional embodiments, the real-time chilled water flow acquisition module 905 acquires the real-time water flow measured by a cooling capacity-flow integrated control regulating valve provided at the user end.

[0148] In some optional embodiments, the real-time supply and return water temperature difference acquisition module 903 is communicatively connected with the real-time chilled water supply temperature acquisition module 901 and the real-time chilled water return water temperature acquisition module 902 to obtain the real-time supply and return water temperature difference by calculating the difference between the real-time return water temperature and the constant supply water temperature.

[0149] In some optional embodiments, the cooling capacity-flow integrated control regulating valve control module 904 is communicated with the real-time supply and return water temperature difference acquisition module 903 to adjust the opening and closing degree of the cooling capacity-flow integrated control regulating valve according to the real-time supply and return water temperature difference of each user.

[0150] In some optional embodiments, the real-time chilled water cooling capacity acquisition module 906 is communicated with the real-time chilled water flow acquisition module 905 and the real-time supply and return water temperature difference acquisition module 903 to calculate the real-time chilled water cooling capacity of each user according to the real-time chilled water flow and the real-time supply and return water temperature difference of each user through the formula: P = m × c × ΔT / 3.6, where P is the real-time chilled water cooling capacity (kW) of each user, and Q is the real-time chilled water flow (m 3 / h), c is the specific heat capacity of water (kJ / kg·℃), and ΔT is the real-time supply and return water temperature difference of each user (℃).

[0151] In some optional embodiments, the average refrigerated water cooling capacity acquisition module 907 is communicated with the real-time refrigerated water cooling capacity acquisition module 906 to obtain the real-time refrigerated water cooling capacity of each user, and the average value of the real-time refrigerated water cooling capacity of each user within the unit mapping time is taken to calculate the average refrigerated water cooling capacity of each user within the unit mapping time.

[0152] In some optional embodiments, the average refrigerated water cooling capacity sum acquisition module 908 is communicated with the average refrigerated water cooling capacity acquisition module 907, and the average refrigerated water cooling capacity of each user in the unit mapping time is added up to obtain the average refrigerated water cooling capacity sum of all users in the unit mapping time period.

[0153] In some optional embodiments, the surplus cooling capacity acquisition module 909 is communicated with the average chilled water cooling capacity sum acquisition module 908, and 5% to 10% of the average chilled water cooling capacity sum in the current unit mapping time period is used as the surplus cooling capacity value in the next unit mapping time period.

[0154] In some optional embodiments, the supply and demand cooling capacity acquisition module 910 is communicated with the average chilled water cooling capacity sum acquisition module 908 and the surplus cooling capacity acquisition module 909, and the supply and demand cooling capacity in the next unit mapping time period is obtained by adding the average chilled water cooling capacity sum and the surplus cooling capacity of all users in the unit mapping time period.

[0155] In a specific embodiment, the control module 911 is a control center.

[0156] In a more specific embodiment, the control module 911 converts the supply demand cooling signal into a corresponding current or voltage signal, which corresponds to the determined frequency of the chilled water pump, and gives the information to the chilled water pump operating frequency control module 911a and the chilled water pump working unit number control module 911b, thereby controlling and adjusting the frequency of the chilled water pump and the working number of the chilled water pump to ensure the chilled water cooling demand of each user end and ensure the safe and stable operation of the system.

[0157] This embodiment further provides a computer-readable storage medium on which a computer program is stored. When the program is called by a processor, the control method of the air-conditioning chilled water system provided by the present invention is implemented.

[0158] Among them, the computer-readable storage medium can be a tangible device that can hold and store instructions used by the instruction execution device. The computer-readable storage medium can be, for example, (but not limited to) an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the above. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, and a mechanical encoding device.

[0159] The computer-readable program described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. A network adapter card or a network interface in each computing / processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in each computing / processing device.

[0160] See also Fig.12 This embodiment provides a schematic diagram of the structure of an electronic device for implementing the control method of the air-conditioning chilled water system. The electronic device described in the present invention represents a computer for data processing and communication.

[0161] like Fig.12 As shown, the electronic device of the present invention includes at least one memory 120, at least one processor 130, and a computer program stored in the memory 120 and executable on the processor 130, and the communication interface 110 is used for communication between the memory 120 and the processor 130. The processor 130 may be a dedicated or general-purpose programmable processor, the computer program may be written in any combination of one or more programming languages, and the computer program may be executed completely on the machine, partially on the machine, partially on the machine as an independent software package and partially on a remote machine, or completely on a remote machine or server.

[0162] It should be noted that it should be understood that the division of the various modules of the above devices is only a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or physically separated. Moreover, these modules can be all implemented in the form of software calling through processing elements, or all implemented in the form of hardware, or some modules can be implemented in the form of software calling through processing elements, and some modules can be implemented in the form of hardware.

[0163] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0164] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A control method for an air conditioning chilled water system, characterized in that: include: Obtaining the real-time chilled water supply temperature and the real-time chilled water return temperature of each user in the air-conditioning chilled water system; wherein the air-conditioning chilled water system comprises a cooling capacity-flow integrated control regulating valve provided at the water inlet end of each user; Based on the real-time chilled water supply temperature and real-time chilled water return temperature of each user, obtain the real-time supply and return water temperature difference of each user; Based on the real-time supply and return water temperature difference of each user, the opening and closing degree of the cooling capacity-flow integrated control regulating valve is controlled.

2. The control method according to claim 1, characterized in that: The control method further comprises: Obtain the sum of the average chilled water cooling capacity of all users in the unit mapping time period; wherein the air conditioning chilled water system includes a chilled water pump; The sum of the average chilled water cooling capacity in the unit mapping time period and the set surplus cooling capacity is used as the supply demand cooling capacity in the next unit mapping time period; In the next unit mapping time period, the operating frequency of the chilled water pump is adjusted based on the corresponding supply demand cooling capacity. And / or, the target supply and return water temperature difference of each user end in the air-conditioning chilled water system is set to 5-6°C.

3. The control method according to claim 2, characterized in that: The step of obtaining the sum of the average chilled water cooling capacity of all users in the unit mapping time period includes: Obtain the real-time chilled water flow of each user in the air-conditioning chilled water system; Based on the real-time supply and return water temperature difference and real-time chilled water flow of each user, obtain the real-time chilled water cooling capacity of each user; Based on the real-time chilled water cooling capacity data string of each user in the unit mapping time period, the average chilled water cooling capacity in the unit mapping time period is obtained; Based on the average chilled water cooling capacity of each user in the unit mapping time period, the sum of the average chilled water cooling capacity of all users in the unit mapping time period is obtained; And / or, the surplus cooling capacity is 5% to 10% of the total average chilled water cooling capacity; And / or, the unit mapping time period is 50 to 180 seconds; And / or, when the real-time supply and return water temperature difference at the user end exceeds the range of the target supply and return water temperature difference, the opening and closing degree of the cooling capacity-flow integrated control regulating valve is controlled to supply the required chilled water cooling capacity, keeping the real-time supply and return water temperature difference within the range of the target supply and return water temperature difference.

4. The control method according to claim 1, characterized in that: The user is a floor, a communication room unit or a communication equipment unit; and / or, the air-conditioning chilled water system includes one or more users, and any user is arranged in parallel with any other user based on a chilled water pipeline; and / or, the air-conditioning chilled water system is provided with thermometers at the water supply end and the return water end of each user to monitor the water supply temperature and the return water temperature in real time; and / or, the air-conditioning chilled water system includes at least 2 chillers connected in parallel with each other.

5. The control method according to claim 4, characterized in that: When the number of operating chillers in the air-conditioning chilled water system is ≥1, and the total real-time chilled water cooling capacity of the users increases to more than 85% of the rated cooling capacity of the chillers with the current number of operating units, and remains unchanged within a unit time, the number of operating chillers is controlled to increase to ensure that the total real-time chilled water cooling capacity is met; and / or, when the number of operating chillers in the air-conditioning chilled water system is >1, and the total real-time chilled water cooling capacity of the users is less than 40% of the rated cooling capacity of the chillers with the current number of operating units, and remains unchanged within a unit time, the number of operating chillers is controlled to decrease; and / or, the air-conditioning chilled water system also includes a bypass pipeline, which is arranged in parallel with any chilled water pipeline acting on the user; when only one chiller is in operation and the total real-time chilled water cooling capacity of each user within a unit time is still less than 35% of the rated cooling capacity of a single chiller, the bypass pipeline is controlled to be connected to ensure the cooling capacity required for safe operation of the system.

6. The control method according to claim 5, characterized in that: The unit time is 5 to 10 minutes, and / or the cooling capacity required to ensure safe operation of the system is the difference between 35% of the rated cooling capacity of the chiller and the total cooling capacity of the user's real-time refrigerated water.

7. The control method according to claim 2, characterized in that: The air conditioning chilled water system includes at least two chilled water pumps connected in parallel. The operating frequency and / or the number of chilled water pumps in operation in the next unit mapping time period are controlled according to the supply demand cooling capacity to ensure that the supply demand cooling capacity is met.

8. A control device for an air conditioning chilled water system, characterized in that: The control device at least comprises: A real-time chilled water supply temperature acquisition module is used to obtain the real-time chilled water supply temperature of each user in the air-conditioning chilled water system; A real-time chilled water return temperature acquisition module is used to obtain the real-time chilled water return temperature of each user in the air-conditioning chilled water system; A real-time supply and return water temperature difference acquisition module is used to obtain the real-time supply and return water temperature difference of each user in the air-conditioning chilled water system; The cooling capacity-flow integrated control regulating valve control module is used to control the opening and closing degree of the cooling capacity-flow integrated control regulating valve based on the real-time supply and return water temperature difference of each user.

9. The control device according to claim 8, characterized in that: The control device also includes: An average refrigeration water cooling capacity sum acquisition module is used to acquire the average refrigeration water cooling capacity sum of all users in the unit mapping time period based on the average refrigeration water cooling capacity of each user in the unit mapping time period; The supply and demand cooling capacity acquisition module is used to take the sum of the average chilled water cooling capacity in the unit mapping time period and the set surplus cooling capacity as the supply and demand cooling capacity in the next unit mapping time period; The chilled water pump operating frequency control module is used to adjust the operating frequency of the chilled water pump based on the corresponding supply demand cooling capacity within the next unit mapping time period.

10. The control device according to claim 9, characterized in that: The control device also includes: A real-time chilled water flow acquisition module is used to obtain the real-time chilled water flow of each user in the air-conditioning chilled water system; A real-time chilled water cooling capacity acquisition module is used to acquire the real-time chilled water cooling capacity of each user in the air-conditioning chilled water system based on the real-time supply and return water temperature difference and the real-time chilled water flow of each user; An average refrigerated water cooling capacity acquisition module is used to acquire the average refrigerated water cooling capacity within the unit mapping time period based on the real-time refrigerated water cooling capacity data string of each user within the unit mapping time period; And / or, the control device further comprises a surplus cooling capacity acquisition module, which is used to acquire the surplus cooling capacity in the next unit mapping time period based on the average total chilled water cooling capacity of the unit mapping time; And / or, the control device further comprises a chiller operating number control module, which is used to control the operating number of the chillers according to the real-time total refrigeration water cooling capacity to ensure that the real-time total refrigeration water cooling capacity is met; And / or, the control device further comprises a chilled water pump operating number control module, which is used to control the operating number of chilled water pumps in the next unit mapping time period according to the supply demand cooling capacity to ensure that the supply demand cooling capacity is met; And / or, the control device also includes a bypass pipe control module, which is used to control the bypass pipe to be connected to ensure the cooling capacity required for safe operation of the system when only one chiller is operating and the average total chilled water cooling capacity is still less than 35% of the rated cooling capacity of the chiller.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is used to enable a processor to implement the control method according to any one of claims 1 to 7 when executed.

12. An electronic device, characterized in that: The electronic device comprises: a processor, a memory and a computer program; the memory is communicatively connected to the processor, the memory stores the computer program, and the processor executes the computer program to implement the control method according to any one of claims 1 to 7.

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