CN112665129A - Air conditioning unit control method and device and air conditioning unit - Google Patents
Air conditioning unit control method and device and air conditioning unit Download PDFInfo
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Abstract
The invention discloses an air conditioning unit control method, an air conditioning unit control device and an air conditioning unit, and belongs to the field of air conditioning control; the control method comprises the following steps: acquiring air conditioning load and operation data of an air conditioning unit; then judging whether the air conditioner load changes; and finally, adjusting the valve opening of an expansion valve for controlling the flow of the water coil according to the judgment result and the operation data. According to the scheme, different methods are adopted to control the valve opening of the expansion valve according to whether the air conditioner load changes; when the air conditioner load is not changed, the opening of the valve can be controlled in time, the problems that the control speed is low and the traditional control method has certain hysteresis are solved, the control speed of the air conditioning unit is improved, the energy is saved, and the use experience of a user is greatly improved.
Description
Technical Field
The invention relates to an air conditioner control technology, in particular to an air conditioner unit control method and device and an air conditioner unit.
Background
When the temperature of the air conditioner is adjusted, the temperature is mainly adjusted by an air system and a water system. Wherein the air system mainly comprises the air supply volume of the air feeder; the water system mainly comprises the flow of the water coil. The air supply quantity is determined by the frequency of the blower; the flow of the water coil is determined by the valve opening of the expansion valve. The control of the valve opening degree of the expansion valve is adjusted according to the air supply temperature and humidity, the traditional control mode adopts a valve flow demand algorithm to calculate the required value of the flow according to the air supply temperature and humidity of the air conditioner, and then utilizes a valve opening degree control algorithm to calculate the valve opening degree value according to the current situation and the required value of the flow, so that when the air conditioner load is unchanged in the traditional control mode, the required value of the flow is unchanged, and the valve opening degree is unchanged. However, in the actual control process, even if the air conditioning load is not changed, the pressure difference between two ends of the valve is changed due to the change of the hydraulic characteristics of other loops, at the moment, the actual flow rate in the water coil pipe is changed along with the change of the hydraulic characteristics of other loops, and the actual air supply temperature and humidity are changed along with the change of the actual air supply temperature and humidity. However, after the actual flow changes, the air supply temperature and humidity change slowly, the valve opening cannot be adjusted in time, and the valve opening can be determined again only after the air supply temperature and humidity change, so that in the process of determining the valve opening again, the traditional control method is slow in control speed, has certain hysteresis, can cause resource waste, and is poor in user experience.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an air conditioning unit control method, an air conditioning unit control device and an air conditioning unit, and aims to solve the problems that in the process of re-determining the opening degree of a valve, the traditional control method is slow in control speed and has certain hysteresis, so that resource waste is caused, and meanwhile, the user experience is poor.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in a first aspect,
a control method of an air conditioning unit comprises the following steps:
acquiring air conditioning load and operation data of an air conditioning unit, wherein the operation data comprises: air supply parameters and actual flow of the water coil;
judging whether the air conditioner load changes;
and adjusting the valve opening of an expansion valve for controlling the flow of the water coil according to the judgment result and the operation data.
Further, the adjusting the valve opening according to the judgment result and the operation data includes:
when the air conditioner load changes, the opening of the valve is adjusted according to the air supply parameters;
when the air conditioner load is not changed, judging the relation between the actual flow and the flow demand value; and adjusting the opening of the valve according to the judgment result.
Further, the adjusting the valve opening according to the air supply parameter includes:
calculating by adopting a valve flow demand algorithm according to the air supply parameters to obtain a flow demand value;
calculating to obtain the target opening value of the valve by adopting a valve opening control algorithm according to the flow demand value;
and adjusting the valve opening to be equal to the target opening value.
Further, the following steps: the calculating the flow demand value by adopting a valve flow demand algorithm according to the air supply parameters comprises the following steps:
calculating the difference value between the air supply parameter and the set air supply parameter;
and calculating to obtain a flow demand value according to the difference value by adopting a PID control algorithm.
Further, the calculating the target valve opening value by using a valve opening control algorithm according to the flow demand value includes:
acquiring a pressure difference value of an inlet and an outlet of a water side of the water coil pipe;
and calculating to obtain the target opening value of the valve according to the pressure difference value and the flow demand value.
Further, the adjusting the valve opening according to the judgment result includes:
when the actual flow rate is equal to the flow rate demand value, keeping the valve opening constant;
and when the actual flow is not equal to the flow demand value, calculating a target opening value of the valve by adopting a valve opening control algorithm according to the flow demand value, and adjusting the valve opening to be equal to the target opening value.
Further, the calculating the target opening value of the valve by using a valve opening control algorithm according to the flow demand value includes:
acquiring a pressure difference value of an inlet and an outlet of a water side of the water coil pipe;
and calculating to obtain the target opening value of the valve according to the pressure difference value and the flow demand value.
Further, the air supply parameter adopts any one of the following parameters:
the temperature of the air supply;
and (5) air supply humidity.
Further, the air conditioning unit is a combined air conditioner.
In a second aspect of the present invention,
an air conditioning unit control device comprising:
the acquisition module is used for acquiring air conditioning load and operation data of the air conditioning unit, wherein the operation data comprises: air supply parameters and actual flow of the water coil;
the judging module is used for judging whether the air conditioner load changes;
and the adjusting module is used for adjusting the valve opening of an expansion valve for controlling the flow of the water coil according to the judging result and the operation data.
In a third aspect,
an air conditioning assembly comprising: the device according to the above technical solution.
This application adopts above technical scheme, possesses following beneficial effect at least:
the technical scheme of the application provides an air conditioning unit control method, an air conditioning unit control device and an air conditioning unit, wherein the control method comprises the following steps: acquiring air conditioning load and operation data of an air conditioning unit; then judging whether the air conditioner load changes; and finally, adjusting the valve opening of an expansion valve for controlling the flow of the water coil according to the judgment result and the operation data. According to the scheme, different methods are adopted to control the valve opening of the expansion valve according to whether the air conditioner load changes; when the air conditioner load is not changed, the opening of the valve can be controlled in time, the problems that the control speed is low and the traditional control method has certain hysteresis are solved, the control speed of the air conditioning unit is improved, the energy is saved, and the use experience of a user is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a control method for an air conditioning unit according to an embodiment of the present invention;
FIG. 2 is a logic diagram of a valve control provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of a control logic when the air conditioning load changes according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a control logic when the air conditioning load is not changed according to an embodiment of the present invention;
fig. 5 is a structural view of a control apparatus of an air conditioning unit according to an embodiment of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the technical solutions of the present invention is provided with reference to the accompanying drawings and examples. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, an embodiment of the present invention provides an air conditioning unit control method, including the following steps:
acquiring air conditioning load and operation data of an air conditioning unit, wherein the operation data comprises: air supply parameters and actual flow of the water coil;
judging whether the air conditioner load changes;
and adjusting the valve opening of an expansion valve for controlling the flow of the water coil according to the judgment result and the operation data.
The embodiment of the invention provides an air conditioning unit control method, which comprises the steps of obtaining air conditioning load and operation data of an air conditioning unit; then judging whether the air conditioner load changes; and finally, adjusting the valve opening of an expansion valve for controlling the flow of the water coil according to the judgment result and the operation data. The control method of the embodiment of the invention adopts different methods to control the valve opening of the expansion valve according to whether the air conditioner load changes; when the air conditioner load is not changed, the opening of the valve can be controlled in time, the problems that the control speed is low and the traditional control method has certain hysteresis are solved, the control speed of the air conditioning unit is improved, the energy is saved, and the use experience of a user is greatly improved.
As a supplementary explanation of the embodiment of the present invention, the adjustment of the valve opening degree according to the judgment result and the operation data includes two cases.
In the first case: when the air conditioner load changes, the opening of the valve is adjusted according to the air supply parameters; specifically, a valve flow demand algorithm is adopted to calculate according to air supply parameters to obtain a flow demand value; calculating to obtain a target opening value of the valve by adopting a valve opening control algorithm according to the flow demand value; the opening of the regulating valve is equal to the target opening value.
As an optional implementation manner of the embodiment of the present invention, calculating the flow demand value by using a valve flow demand algorithm according to the air supply parameter includes: calculating the difference value between the air supply parameter and the set air supply parameter; and calculating to obtain a flow demand value according to the difference value by adopting a PID control algorithm.
Adopting a valve opening control algorithm according to the flow demand value, and calculating to obtain a valve target opening value, wherein the valve target opening value comprises the following steps: acquiring a pressure difference value of an inlet and an outlet of a water side of the water coil pipe; and calculating to obtain a target opening value of the valve according to the pressure difference value and the flow demand value.
In the second case: when the air conditioner load is not changed, judging the relation between the actual flow and the flow demand value; and adjusting the opening of the valve according to the judgment result. Specifically, when the actual flow rate is equal to the flow rate demand value, the valve opening is kept unchanged; and when the actual flow is not equal to the flow demand value, calculating by adopting a valve opening control algorithm according to the flow demand value to obtain a target opening value of the valve, wherein the opening of the regulating valve is equal to the target opening value.
As an optional implementation manner of the embodiment of the present invention, the calculating the target opening value of the valve by using a valve opening control algorithm according to the flow demand value includes: acquiring a pressure difference value of an inlet and an outlet of a water side of the water coil pipe; and calculating to obtain a target opening value of the valve according to the pressure difference value and the flow demand value.
In the control method provided by the embodiment of the present invention, the air supply parameter is the air supply temperature or the air supply humidity.
As a preferred implementation manner of the embodiment of the present invention, the air conditioning unit in the embodiment of the present invention is a combined air conditioner.
In order to more clearly understand the control method provided by the embodiment of the present invention, the principle of the control method of the present invention is described below.
As shown in fig. 2, an embodiment of the present invention provides a control method for a combined air conditioner, where an air supply parameter is an air supply temperature. When the air conditioner is operated, the air supply temperature of the combined air conditioner is fed back through the temperature sensor, the PID control algorithm is triggered, the PID control algorithm calculates a flow demand value through the difference between the fed back air supply temperature of the combined air conditioner and a set temperature value, and the flow demand value is fed back to the valve opening control algorithm. The valve opening control algorithm automatically adjusts the opening of the valve, the actual opening of the valve controls the water flow of the water coil pipe to meet the requirement, meanwhile, the actual flow is fed back to the valve opening control algorithm, and the control system stably operates. When the hydraulic characteristics of the air-conditioning water system change, the pressure difference between the inlet and the outlet of the water side of the water coil pipe changes, so that the actual flow of the water coil pipe changes, the actual flow is fed back to a valve opening control algorithm, the opening of the valve is automatically adjusted, and the actual flow passing through the water coil pipe is matched with the required flow.
The specific control logic inside the air conditioner is shown in fig. 3 and 4.
FIG. 3 provides a control logic for a change in air conditioning load; when the load of the indoor air conditioner changes, the return air temperature of the combined air conditioner changes, and the supply air temperature and humidity of the air conditioner are triggered to change. The change of the return air temperature causes the corresponding change of the frequency conversion control algorithm of the air feeder, the frequency of the air feeder is adjusted, the change of the frequency of the air feeder correspondingly causes the change of the air output of the combined air conditioner to meet the requirement, and the change of the air output directly influences the change of the air output temperature.
When the air supply temperature changes, the sensor transmits a change signal to a valve flow demand algorithm, a demand value of actual flow is calculated according to the valve flow demand algorithm, the opening degree of a valve is output through a valve opening degree control algorithm, the expansion valve automatically adjusts the size of the expansion valve according to the output valve opening degree, the flow of the water coil pipe is converted into the demand value, the air supply temperature is adjusted, meanwhile, the actual flow is fed back to the valve opening degree control algorithm through the water coil pipe and is compared with the flow demand value, and the cooling capacity of the water coil pipe is changed according to the actual demand value.
Fig. 4 provides control logic when there is no change in air conditioning load. When the air conditioning load is not changed, the flow demand value remains unchanged. And detecting whether the opening of the valve of the most unfavorable loop is smaller than a set value, if not, continuously detecting at intervals, if so, adjusting the frequency of the refrigerating pump to increase through a refrigerating pump frequency conversion control strategy, and triggering the change of the hydraulic characteristic of the air-conditioning water system through the frequency change of the refrigerating pump. Because the hydraulic characteristic of the air-conditioning water system is changed, the pressure difference between the inlet and the outlet of the water side of the water coil pipe is changed, so that the actual water flow of the water coil pipe is changed, and at the moment, the valve opening control algorithm is triggered to output the valve opening to the expansion valve. The expansion valve regulates the actual flow of the valve and returns to the flow demand value, thereby keeping the cooling capacity of the water coil unchanged.
The control method of the embodiment of the invention can flexibly change the flow of the chilled water pump, more intelligently adjust the coordinated and stable operation of the air system and the air-conditioning water system, reduce energy waste in an optimized operation mode, realize the high-efficiency operation of the air-water linkage system, further improve the energy-saving level of the air-water linkage system, dynamically adjust the flow of the valve in time to meet the requirement of cold supply capacity, reduce the waste of system cold quantity and greatly improve the energy-saving level of the system.
In one embodiment, the present invention provides an air conditioning unit control apparatus, as shown in fig. 5, including:
an obtaining module 51, configured to obtain an air conditioning load and operation data of the air conditioning unit, where the operation data includes: air supply parameters and actual flow of the water coil; the air supply parameter adopts any one of the following parameters: the temperature of the air supply; and (5) air supply humidity.
And a judging module 52, configured to judge whether the air conditioning load changes.
And the adjusting module 53 is used for adjusting the valve opening of the expansion valve for controlling the flow of the water coil according to the judgment result and the operation data.
Specifically, when the air conditioning load changes, the adjusting module adjusts the opening of the valve according to the air supply parameters; when the air conditioner load is not changed, the judgment module judges the relation between the actual flow and the flow demand value; and the adjusting module adjusts the opening of the valve according to the judgment result.
As an optional implementation manner of the embodiment of the present invention, adjusting the valve opening according to the air supply parameter includes: calculating by adopting a valve flow demand algorithm according to the air supply parameters to obtain a flow demand value; calculating to obtain a target opening value of the valve by adopting a valve opening control algorithm according to the flow demand value; the opening of the regulating valve is equal to the target opening value.
The method for calculating the flow demand value by adopting the valve flow demand algorithm according to the air supply parameters comprises the following steps: calculating the difference value between the air supply parameter and the set air supply parameter; and calculating to obtain a flow demand value according to the difference value by adopting a PID control algorithm.
Adopting a valve opening control algorithm according to the flow demand value, and calculating to obtain a valve target opening value, wherein the valve target opening value comprises the following steps: acquiring a pressure difference value of an inlet and an outlet of a water side of the water coil pipe; and calculating to obtain a target opening value of the valve according to the pressure difference value and the flow demand value.
As an optional implementation manner of the embodiment of the invention, when the actual flow rate is equal to the flow rate demand value, the valve opening is kept unchanged; and when the actual flow is not equal to the flow demand value, calculating by adopting a valve opening control algorithm according to the flow demand value to obtain a target opening value of the valve, wherein the opening of the regulating valve is equal to the target opening value.
Wherein, the calculating the target opening value of the valve by adopting a valve opening control algorithm according to the flow demand value comprises the following steps: acquiring a pressure difference value of an inlet and an outlet of a water side of the water coil pipe; and calculating to obtain a target opening value of the valve according to the pressure difference value and the flow demand value.
As a preferred implementation manner of the embodiment of the present invention, a combined air conditioner is adopted in the air conditioning unit in the embodiment of the present invention.
According to the air conditioning unit control device provided by the embodiment of the invention, the acquisition module acquires the air conditioning load and the operation data of the air conditioning unit; the judging module judges whether the air conditioner load changes; and the adjusting module adjusts the valve opening of an expansion valve for controlling the flow of the water coil according to the judgment result and the operation data. When the air conditioner load changes, the control device calculates the actual demand value of the flow through the deviation of the air supply temperature and a set value; when the load of the air conditioner is not changed and the hydraulic characteristic is changed, the control device calculates the flow demand value through the pressure difference of the water inlet and the water outlet of the water side of the water coil, and the valve opening is automatically adjusted, so that the flow of the water coil is supplied according to the demand, and the unit can run with energy conservation and high efficiency.
In one embodiment, the invention further provides an air conditioning unit, which comprises the control device provided by the embodiment. The expansion valve is used for timely and accurately adjusting the opening of the valve to control the flow. The problem of adjustment hysteresis existing in a traditional air conditioner control system is avoided, the valve opening caused by changes of indoor temperature and humidity and hydraulic characteristics of pipelines is automatically and rapidly adjusted, the adjustment delay of the air conditioning unit is reduced, and the efficient operation of the air conditioning unit is promoted.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (11)
1. The control method of the air conditioning unit is characterized by comprising the following steps:
acquiring air conditioning load and operation data of an air conditioning unit, wherein the operation data comprises: air supply parameters and actual flow of the water coil;
judging whether the air conditioner load changes;
and adjusting the valve opening of an expansion valve for controlling the flow of the water coil according to the judgment result and the operation data.
2. The method of claim 1, wherein: the adjusting the valve opening according to the judgment result and the operation data comprises:
when the air conditioner load changes, the opening of the valve is adjusted according to the air supply parameters;
when the air conditioner load is not changed, judging the relation between the actual flow and the flow demand value; and adjusting the opening of the valve according to the judgment result.
3. The method of claim 2, wherein: the adjusting the valve opening according to the air supply parameter comprises:
calculating by adopting a valve flow demand algorithm according to the air supply parameters to obtain a flow demand value;
calculating to obtain the target opening value of the valve by adopting a valve opening control algorithm according to the flow demand value;
and adjusting the valve opening to be equal to the target opening value.
4. The method of claim 3, wherein: the calculating the flow demand value by adopting a valve flow demand algorithm according to the air supply parameters comprises the following steps:
calculating the difference value between the air supply parameter and the set air supply parameter;
and calculating to obtain a flow demand value according to the difference value by adopting a PID control algorithm.
5. The method of claim 3, wherein: the calculating the target valve opening value according to the flow demand value by adopting a valve opening control algorithm comprises the following steps:
acquiring a pressure difference value of an inlet and an outlet of a water side of the water coil pipe;
and calculating to obtain the target opening value of the valve according to the pressure difference value and the flow demand value.
6. The method of claim 2, wherein: the adjusting the valve opening according to the judgment result comprises:
when the actual flow rate is equal to the flow rate demand value, keeping the valve opening constant;
and when the actual flow is not equal to the flow demand value, calculating a target opening value of the valve by adopting a valve opening control algorithm according to the flow demand value, and adjusting the valve opening to be equal to the target opening value.
7. The method of claim 6, wherein: the calculating the target opening value of the valve by adopting a valve opening control algorithm according to the flow demand value comprises the following steps:
acquiring a pressure difference value of an inlet and an outlet of a water side of the water coil pipe;
and calculating to obtain the target opening value of the valve according to the pressure difference value and the flow demand value.
8. The method according to any one of claims 1 to 7, wherein: the air supply parameter adopts any one of the following parameters:
the temperature of the air supply;
and (5) air supply humidity.
9. The method of claim 8, wherein the air conditioning unit is a combination air conditioner.
10. An air conditioning unit control apparatus characterized by comprising:
the acquisition module is used for acquiring air conditioning load and operation data of the air conditioning unit, wherein the operation data comprises: air supply parameters and actual flow of the water coil;
the judging module is used for judging whether the air conditioner load changes;
and the adjusting module is used for adjusting the valve opening of an expansion valve for controlling the flow of the water coil according to the judging result and the operation data.
11. An air conditioning assembly, comprising: the apparatus of claim 10.
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| CN202011497130.2A CN112665129A (en) | 2020-12-17 | 2020-12-17 | Air conditioning unit control method and device and air conditioning unit |
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| CN202011497130.2A CN112665129A (en) | 2020-12-17 | 2020-12-17 | Air conditioning unit control method and device and air conditioning unit |
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| US20150089963A1 (en) * | 2012-04-06 | 2015-04-02 | Zhongxi Tan | Central air-conditioning system and control method thereof |
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| CN105757851A (en) * | 2016-03-31 | 2016-07-13 | 深圳市新环能科技有限公司 | Chilled water flow-variable energy-saving control method and system |
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- 2020-12-17 CN CN202011497130.2A patent/CN112665129A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101769586A (en) * | 2010-02-04 | 2010-07-07 | 无锡永信能源科技有限公司 | Cold (warm) water circulation energy efficiency control method and cold (warm) water circulation energy efficiency control device for central air-conditioning system |
| US20150089963A1 (en) * | 2012-04-06 | 2015-04-02 | Zhongxi Tan | Central air-conditioning system and control method thereof |
| CN105737284A (en) * | 2016-03-02 | 2016-07-06 | 杭州源牌环境科技有限公司 | Pipe network balance distribution and variable flow control method of air conditioner water system |
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