WO2022213494A1

WO2022213494A1 - Energy-saving control method, system and device for water chilling unit of central air conditioner

Info

Publication number: WO2022213494A1
Application number: PCT/CN2021/104075
Authority: WO
Inventors: 刘煜; 孙再连; 梅瑜
Original assignee: 厦门邑通智能科技集团有限公司
Priority date: 2021-04-07
Filing date: 2021-07-01
Publication date: 2022-10-13
Also published as: CN115183421A

Abstract

Provided in the present invention are an energy-saving control method, system and device for a water chilling unit of a central air conditioner. The method comprises: performing, within a safe range, a heuristic operation and/or a fine adjustment operation on parameters that comprise three types of parameters, namely the number and gears of cooling tower fans that are turned on, the number of cooling tower water pumps that are turned on, and a chilled water supply temperature setting; after each heuristic operation and/or fine adjustment operation, calculating the overall energy consumption of a water chilling unit and a cooling tower; and taking a combination of operation parameters with the lowest energy consumption and corresponding basic working conditions and energy consumption within a unit time as operation knowledge and learning parameters, and recording same in a database. By means of the present invention, overall learning is performed on running parameters of a water chilling unit and a cooling tower, and heuristic fine adjustment is performed within a safe operation range, so as to search for the most energy-saving control method, such that energy saving performance of an air conditioner main unit is further improved.

Description

A central air-conditioning water-cooling unit energy-saving control method, system and equipment

technical field

The invention relates to an energy-saving control method, system and equipment for a central air-conditioning water-cooling unit.

Background technique

The control of the central air-conditioning chiller is controlled by the group control system. The main functions of the group control system are the opening of the air conditioner host and the operation scheduling of multiple hosts. The adjustment of the water pump adopts PID adaptive control, and the temperature of the chilled water supply adopts a fixed setting. method, the entire control system only controls each local link, and cannot perform overall dynamic adjustment. Although the group control system has a certain energy-saving effect, there is still a large space for energy-saving.

technical problem

The embodiments of the present invention provide an energy-saving control method, system and equipment for a central air-conditioning water-cooling unit. By using a machine learning method on the basis of group control system control, the operating parameters of the water-cooling unit and the cooling tower can be learned as a whole. Exploratory fine-tuning is carried out within the range to find the most energy-saving control method, thereby further improving the energy saving of the air conditioner.

technical solutions

In the first aspect, an energy-saving control method for central air-conditioning water-cooled units is proposed, and the parameters including the number and gear of cooling tower fans, the number of cooling tower pumps, and the setting of chilled water supply temperature are tested within a safe range. Operation and/or fine-tuning operation, calculate the overall energy consumption of the chiller and cooling tower after each trial operation and/or fine-tuning operation, and take the combination of operating parameters with the lowest energy consumption and its corresponding basic operating conditions and energy consumption per unit time as operating knowledge and learning parameters are recorded in the database.

The present invention conducts an overall study of the operating parameters of the chiller unit and the cooling tower, and conducts tentative fine-tuning within the scope of safe operation, so as to find the most energy-saving control method, thereby further improving the energy-saving of the air conditioner host.

Preferably, the learning parameters include: external wet bulb temperature, external humidity, chiller working mode, number of chillers on, cooling tower inlet water temperature, cooling tower outlet water temperature, chilled water supply temperature and chilled water return water temperature.

Preferably, the combination of operating parameters includes the chilled water supply temperature setting, the number and frequency of cooling tower pumps, and the number and frequency of cooling tower fans.

Preferably, the method comprises the steps:

S11: Data matching, search in the database, if the operation knowledge under the same working conditions can be matched, the operation knowledge with the lowest energy consumption among the operation knowledge and lower than the current overall energy consumption of the central air-conditioning water-cooling unit is used, and the operation knowledge is used. The operating knowledge is to operate the central air-conditioning water-cooling unit;

S12: Probing operation, when the operating knowledge that is lower than the current overall energy consumption of the central air-conditioning water-cooling unit under the same working conditions cannot be matched in the database, the central air-conditioning water-cooling unit enters the trial operation;

S13: Fine-tuning operation, increase or decrease the gear of the fan according to the temperature of the cooling tower outlet water, or increase or decrease the number of pumps turned on;

S14: After the set time, when the outlet water temperature of the cooling tower is less than the sum of the outdoor wet bulb temperature and the temperature fluctuation range, it is judged that the constraint conditions are met, and a new combination of operating parameters and operating knowledge is formed, and the database is updated, otherwise Back to S11.

By first finding the historical operation data matching the same working conditions in the database, the present invention adopts the historical operation method with safety and reliability, which is incomparable with other operation methods obtained by artificial intelligence. When historical operations cannot be obtained, testing and fine-tuning can be carried out within a safe range. Through testing operations, unprecedented and safe operation methods can be obtained, that is, no manual debugging is required, and the database can be continuously improved.

Preferably, the S12 includes:

When the number of the main engine is more than one, the number of cooling tower pumps will be random numbers in the following range: the number of main engines ~ the total number of cooling tower pumps; the number of cooling tower fans is twice the number of cooling tower pumps, and the cooling tower fans Open the gear to the next high level;

When the number of hosts is equal to one, turn on two cooling tower fans and one cooling tower water pump, and adjust the cooling tower fan gear to the next highest level.

Preferably, described S13 comprises:

When the outlet water temperature of the cooling tower is close to the outdoor wet bulb temperature (within one degree difference), reduce the cooling tower fan gear by one gear. If it is the lowest gear, reduce one cooling tower fan. If the cooling tower fan is reduced by two in total , then one cooling tower water pump is correspondingly reduced;

When the temperature is higher than the sum of the outdoor wet bulb temperature and the fluctuation range of the return water temperature, the cooling tower fan gear will be increased by one gear. If it is the highest gear, a cooling tower fan will be added. If the cooling tower fan is turned on, a cooling tower water pump will be added accordingly. If the cooling tower fan is fully turned on, the operation will not be pushed.

Preferably, the optimal water supply temperature setting for chilled water includes the steps:

S21: Under the same working conditions, search for tentative operation knowledge. If the tentative operation knowledge is matched, an operation suggestion is generated according to the tentative operation knowledge. Otherwise, a tentative parameter table is searched. If the tentative parameter table is not matched, a tentative parameter table is generated. , the test parameter table is a one-dimensional array table after the chilled water supply temperature setting range is divided according to the set interval, the content of the test parameter table is the unit time power consumption table, and the initial value of the unit time power consumption table is 0, which means no test operate;

S22: Find the unit whose power consumption is 0 in the tentative parameter table, and correspondingly generate a tentative operation for setting the chilled water supply temperature under this unit;

S23: Continuously record the electric meter value under the same working condition, and update the power consumption parameter in the tentative parameter table. When there is no unit with 0 power consumption in the tentative parameter table, generate tentative operation knowledge according to the minimum power consumption.

In the second aspect, an energy-saving control system for a central air-conditioning water-cooling unit is proposed, which includes:

a data acquisition module, configured to collect operating parameter combinations and their corresponding basic operating conditions and energy consumption per unit time;

The data storage module, which is a database, stores the data collected by the data acquisition module, and records the combination of operating parameters with the lowest energy consumption and its corresponding basic operating conditions and energy consumption per unit time as operating knowledge and learning parameters in the database;

The data processing module is configured to perform tentative operations and/or fine-tuning operations on three types of parameters including the number and gears of cooling tower fans, the number of cooling tower pumps, and the setting of chilled water supply temperature within a safe range. Calculate the total energy consumption of the chiller and cooling tower after the first trial operation and/or fine-tuning operation.

In a third aspect, an energy-saving control device for a central air-conditioning water-cooling unit is proposed, which includes: a memory and a processor; the memory stores executable codes, and when the executable codes are executed by the processor, all The processor executes the energy-saving control method for the central air-conditioning water-cooling unit in the first aspect.

In a fourth aspect, embodiments of the invention provide a non-transitory machine-readable storage medium, where executable codes are stored on the non-transitory machine-readable storage medium, and when the executable codes are executed by a processor of an electronic device At the time, the processor can at least implement the energy-saving control method for the central air-conditioning water-cooling unit in the first aspect.

beneficial effect

In the embodiment of the present invention, an energy-saving control method, system and equipment for a central air-conditioning water-cooling unit are provided, which have the following advantages:

1. Through the learning and overall testing and/or fine-tuning of the overall operating parameters of the air-conditioning chiller and cooling tower, the overall energy-saving optimization of the central air-conditioning back-end host system is realized;

2. Realize intelligent tuning without human participation by means of tentative operations within the scope of safe operation.

3. By adjusting the setting of the chilled water supply temperature, the air-conditioning host can be indirectly adjusted to the best energy-saving operation state under different air-conditioning loads, so as to realize the intelligent dynamic adjustment of the air-conditioning host.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a flow chart of an energy-saving control method for a central air-conditioning water-cooling unit provided by an embodiment of the present invention;

Fig. 2 is a block diagram of a system provided by an embodiment of the present invention;

Figure 3 is a schematic structural diagram of a medium provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a device provided by an embodiment of the present invention.

Embodiments of the present invention

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a," "the," and "the" as used in the embodiments of the present invention and the appended claims are intended to include the plural forms as well, unless the context clearly dictates otherwise, "a plurality" Generally at least two are included.

Depending on the context, the words "if", "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrases "if determined" or "if detected (the stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detected (the stated condition or event)" )” or “in response to detection (statement or event)”.

In view of the above problems, the present invention provides an energy-saving control method for a central air-conditioning water-cooling unit. Overall energy saving tuning.

The implementation principles of the method, system, device and medium provided by the present invention are similar, and will not be repeated here.

After introducing the basic principles of the present invention, various non-limiting embodiments of the present invention are specifically described below.

The embodiments of the present invention can be applied to HVAC systems in various large-scale public building spaces, especially in traffic hubs, theaters, shopping malls, hotels and other traffic station scenarios. It should be noted that the embodiments provided in the present invention are only for convenience The embodiments of the present invention are shown with an understanding of the spirit and principles of the present invention, and the embodiments of the present invention are not limited in this respect. Rather, embodiments of the present invention can be applied to any scenario where applicable.

Referring to FIG. 1 , an embodiment of the present invention provides an energy-saving control method for a central air-conditioning water-cooling unit. Within a safe range, three types of parameters are set, including the number and gears of cooling tower fans, the number of cooling tower pumps, and the temperature of chilled water supply. Perform trial operation and/or fine-tuning operation on the parameters included in the trial operation and/or fine-tuning operation, calculate the overall energy consumption of the chiller and cooling tower after each trial operation and/or fine-tuning operation, and combine the operating parameters with the lowest energy consumption and their corresponding basic conditions and units Time energy consumption is used as operating knowledge and learning parameters, and recorded in the database.

The learning parameters include: external wet bulb temperature, external humidity, chiller working mode, number of chillers on, cooling tower inlet water temperature, cooling tower outlet water temperature, chilled water supply temperature and chilled water return water temperature.

The operating parameter combination includes the chilled water supply temperature setting, the number and frequency of cooling tower pumps, and the number and frequency of cooling tower fans.

In this embodiment, the method includes the following steps:

S11: The data is matched and retrieved in the database. If the operation knowledge under the same working conditions can be matched, the operation knowledge will be used to operate the central air-conditioning water-cooling unit;

Specifically, when the number of main units turned on is greater than one, the number of cooling tower pumps to be turned on is a random number in the following range: the number of main units turned on ~ the total number of cooling tower pumps; the number of cooling tower fans turned on is twice the number of cooling tower pumps, and the The cooling tower fan opening gear is adjusted to the second highest grade;

S13: Fine-tuning operation, increase or decrease the fan speed according to the cooling tower outlet water temperature, or increase or decrease the number of pumps turned on. Specifically:

In other embodiments, the optimal water supply temperature setting for chilled water includes the following steps:

S22: Find the unit whose power consumption is 0 in the test parameter table, and correspondingly generate the chilled water supply temperature setting operation under this unit;

S23: Continuously record the meter value under the same working conditions, and update the power consumption parameters in the heuristic parameter table,

When there is no unit with 0 power consumption in the heuristic parameter table, the heuristic operation knowledge is generated according to the minimum power consumption.

Please refer to FIG. 2 , the present invention provides an energy-saving control system for a central air-conditioning water-cooling unit, which can implement the HVAC management method in the exemplary embodiment of the present invention corresponding to FIG. 1 . The system includes: a data acquisition module, a data storage module and a data processing module.

The data acquisition module is configured to collect operating parameter combinations and their corresponding basic operating conditions and unit time energy consumption data;

The data storage module is a database, stores the data collected by the data acquisition module, and records the combination of operating parameters with the lowest energy consumption and its corresponding basic operating conditions and energy consumption per unit time as operating knowledge and learning parameters in the database;

The implementation principle of the system in this embodiment is similar to the technical solution of the method, which will not be repeated here.

Having described the method and apparatus of an exemplary embodiment of the present invention, next, with reference to FIG. 3, the present invention provides an exemplary medium 30 storing computer-executable instructions that can be used to The computer is caused to perform the method of the example of the present invention corresponding to FIG. 1 .

After introducing the method, system and medium of the exemplary embodiments of the present invention, next, referring to FIG. 4 , an exemplary device 40 provided by the present invention is introduced, the device 40 includes a processing unit 401, a memory 402, a bus 403, External devices 404, I/O interfaces 405, and network adapters 406, the memory 402 includes random access memory memory, RAM) 4021, a cache memory 4022, a read-only memory (Read-Only Memory, ROM) 4023, and a storage unit array 4025 composed of at least one storage unit 4024. The memory 402 is used to store the program or instruction executed by the processing unit 401; the processing unit 401 is used to execute the method described in the example of the present invention corresponding to FIG. 1 according to the program or instruction stored in the memory 402; the I/ The O interface 405 is used for receiving or sending data under the control of the processing unit 401 .

Here, the exemplary device 40 includes but is not limited to user equipment, network equipment, or a device formed by integrating network equipment and user equipment through a network; the user equipment includes but is not limited to any device that can communicate with the user through a keyboard , remote control, touchpad or voice-activated devices for human-computer interaction electronic products, such as computers, smart phones, ordinary mobile phones, tablet computers, etc.; the network devices include but are not limited to computers, network hosts, a single network server, multiple network devices A set of servers or a cloud of multiple servers.

The device embodiments described above are merely illustrative, wherein the various modules described as separate components may or may not be physically separated. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be realized by adding a necessary general hardware platform, and of course, it can also be realized by a combination of hardware and software. Based on this understanding, the above-mentioned technical solutions can be embodied in the form of computer products in essence or that contribute to the prior art. In the form of a computer program product embodied on a medium including, but not limited to, disk storage, CD-ROM, optical storage, etc.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

An energy-saving control method for a central air-conditioning water-cooling unit, characterized in that:

Carry out trial operation and/or fine-tuning operation on three parameters including cooling tower fan opening number and gear, cooling tower water pump opening number, and chilled water supply temperature setting within a safe range, and each trial operation and/or fine-tuning operation After operation, the overall energy consumption of the chiller and cooling tower is calculated, and the combination of operating parameters with the lowest energy consumption and its corresponding basic operating conditions and energy consumption per unit time are used as operating knowledge and learning parameters, and recorded in the database.
The method of claim 1, wherein:

The learning parameters include: external wet bulb temperature, external humidity, chiller working mode, number of chillers on, cooling tower inlet water temperature, cooling tower outlet water temperature, chilled water supply temperature and chilled water return temperature.
The method of claim 1, wherein:

Operational parameter combinations include chilled water supply temperature settings, cooling tower pump turns and frequency, and cooling tower fan turns on and frequency.
The method according to claim 1 or 3, characterized in that, comprising the steps of:

S11: Data matching, search in the database, if the operation knowledge under the same working conditions can be matched, the operation knowledge with the lowest energy consumption among the operation knowledge and lower than the current overall energy consumption of the central air-conditioning water-cooling unit is used, and the central air-conditioning water cooling unit Air-conditioning water-cooling unit operation;

S12: Probing operation, when the operating knowledge that is lower than the current overall energy consumption of the central air-conditioning water-cooling unit under the same working conditions cannot be matched in the database, the central air-conditioning water-cooling unit enters the trial operation;

S13: Fine-tuning operation, increase or decrease the gear of the fan according to the temperature of the cooling tower outlet water, or increase or decrease the number of pumps turned on;

S14: After the set time, when the outlet water temperature of the cooling tower is less than the sum of the outdoor wet bulb temperature and the temperature fluctuation range, it is judged that the constraint conditions are met, and a new combination of operating parameters and operating knowledge is formed, and the database is updated, otherwise Back to S11.
The method of claim 4, wherein:

The S12 includes:

When the number of the main engine is more than one, the number of cooling tower pumps will be random numbers in the following range: the number of main engines ~ the total number of cooling tower pumps; the number of cooling tower fans is twice the number of cooling tower pumps, and the cooling tower fans Open the gear to the next high level;

When the number of the main engine is equal to one, open two cooling tower fans and one cooling tower water pump, and adjust the cooling tower fan gear to the next highest level.
The method of claim 4, wherein:

The S13 includes:

When the outlet water temperature of the cooling tower is close to the outdoor wet bulb temperature, reduce the cooling tower fan gear by one gear. If it is the lowest gear, reduce one cooling tower fan. If there are two cooling tower fans before and after, reduce one accordingly. cooling tower water pump;

When the temperature is higher than the sum of the outdoor wet bulb temperature and the fluctuation range of the return water temperature, the cooling tower fan gear will be increased by one gear. If it is the highest gear, a cooling tower fan will be added. If the cooling tower fan is turned on, a cooling tower water pump will be added accordingly. If the cooling tower fan is fully turned on, the operation will not be pushed.
method according to claim 4, is characterized in that, the optimum water supply temperature setting of chilled water comprises the steps:

S21: Under the same working conditions, search for tentative operation knowledge. If the tentative operation knowledge is matched, an operation suggestion is generated according to the tentative operation knowledge. Otherwise, a tentative parameter table is searched. If the tentative parameter table is not matched, a tentative parameter table is generated. , the test parameter table is a one-dimensional array table after the chilled water supply temperature setting range is divided according to the set interval, the content of the test parameter table is the unit time power consumption table, and the initial value of the unit time power consumption table is 0, which means no test operate;

S22: Find the unit whose power consumption is 0 in the tentative parameter table, and correspondingly generate a tentative operation for setting the chilled water supply temperature under the unit;

S23: Continuously record the meter value under the same working condition, and update the power consumption parameter in the tentative parameter table,

When there is no unit with 0 power consumption in the heuristic parameter table, the heuristic operation knowledge is generated according to the minimum power consumption.
An energy-saving control system for a central air-conditioning water-cooling unit, comprising:

a data acquisition module, configured to collect operating parameter combinations and their corresponding basic operating conditions and energy consumption per unit time;

The data storage module, which is a database, stores the data collected by the data acquisition module, and records the combination of operating parameters with the lowest energy consumption and its corresponding basic operating conditions and energy consumption per unit time as operating knowledge and learning parameters in the database;

The data processing module is configured to perform tentative operations and/or fine-tuning operations on three types of parameters including the number and gears of cooling tower fans, the number of cooling tower pumps, and the setting of chilled water supply temperature within a safe range. Calculate the total energy consumption of the chiller and cooling tower after the first trial operation and/or fine-tuning operation.
An energy-saving control device for a central air-conditioning water-cooling unit, comprising: a memory and a processor; and executable codes are stored on the memory, and when the executable codes are executed by the processor, the processor is made to execute the following steps: The energy-saving control method for a central air-conditioning water-cooling unit according to any one of claims 1 to 7.