CN109612014B - Air conditioning unit control method, device and system and air conditioning unit - Google Patents
Air conditioning unit control method, device and system and air conditioning unit Download PDFInfo
- Publication number
- CN109612014B CN109612014B CN201811548513.0A CN201811548513A CN109612014B CN 109612014 B CN109612014 B CN 109612014B CN 201811548513 A CN201811548513 A CN 201811548513A CN 109612014 B CN109612014 B CN 109612014B
- Authority
- CN
- China
- Prior art keywords
- air conditioning
- conditioning unit
- pressure
- water temperature
- evaporator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides an air conditioning unit control method, device and system and an air conditioning unit, wherein the method comprises the following steps: acquiring the condensing pressure of an air conditioning unit; when the condensing pressure reaches a first pressure threshold value, limiting the loading of the air conditioning unit; when the condensing pressure reaches a second pressure threshold value, acquiring the current outlet water temperature of the evaporator of the air conditioning unit; the second pressure threshold is greater than the first pressure threshold; determining the outlet water temperature of a target evaporator according to the outlet water temperature of the current evaporator and a preset correction temperature difference; and adjusting the outlet water temperature of the evaporator of the air conditioning unit according to the outlet water temperature of the target evaporator. The air conditioning unit control method, the device and the system provided by the invention can identify and process the factors of surge in advance, thereby avoiding the surge.
Description
Technical Field
The invention relates to an air conditioning unit control technology, in particular to an air conditioning unit control method, device and system and an air conditioning unit.
Background
An air conditioner is a device having a cooling and/or heating capability, and can adjust an indoor temperature to improve comfort. The air conditioner mainly includes: the heat-absorbing and heat-releasing device comprises a compressor, a condenser and an evaporator, wherein refrigerant circularly flows in the three components, and heat absorption and heat release are realized through phase change conversion. Taking the refrigeration function as an example: the evaporator is arranged indoors, when liquid refrigerant flows through the evaporator, the liquid refrigerant is vaporized, and heat is absorbed in the vaporization process, so that the indoor temperature is reduced. The gas output from the evaporator is converted into high-temperature and high-pressure gas through the compressor, the high-temperature and high-pressure gas is liquefied through the condenser, heat is released in the liquefying process, and the heat is discharged outdoors.
The compressor is the core device of the air conditioner, and the stability of the compressor in the operation process directly determines the quality of the air conditioner. One phenomenon that has a greater impact on the compressor during operation of the compressor is surge, which is typically caused by the compressor having an operating pressure ratio (i.e., the ratio of discharge pressure to intake pressure) greater than a set value. When surging occurs, the unit can generate violent vibration and generate larger noise, and the surging can also cause substantial damage to the compressor.
To using in market, hotel etc. can concentrate the air conditioning unit of regulation and control, avoid surging the mode mainly as following several: firstly, the current of a motor dragged by the air conditioning unit is detected, and when the current is larger than a preset current value, the air conditioning unit is controlled to stop so as to protect the unit. But the normal use of the user is affected by the stop of the air conditioning unit. Secondly, the temperature of the liquid in the evaporator is artificially increased to increase the pressure of the inlet air of the compressor, and then the operation pressure ratio of the compressor is reduced to avoid surging. And thirdly, for the air conditioning unit provided with the cooling tower, the cooling capacity of the cooling tower can be improved, the temperature of liquid in the condenser is reduced, the exhaust pressure of the compressor is reduced, the operation pressure ratio of the compressor is further reduced, and surging is avoided. However, since the latter two methods increase the energy consumption of the air conditioning unit and thus increase the operation cost, many users do not perform such an operation, and let the compressor surge, so that the service life of the air conditioning unit is short.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide an air conditioning unit control method, apparatus, system and air conditioning unit, which can identify and process the factors of surge generation in advance, and further avoid the surge generation.
An embodiment of a first aspect of the present invention provides an air conditioning unit control method, including:
acquiring the condensing pressure of an air conditioning unit;
when the condensing pressure reaches a first pressure threshold value, limiting the loading of the air conditioning unit;
when the condensing pressure reaches a second pressure threshold value, acquiring the current outlet water temperature of the evaporator of the air conditioning unit; the second pressure threshold is greater than the first pressure threshold;
determining the outlet water temperature of a target evaporator according to the outlet water temperature of the current evaporator and a preset correction temperature difference;
and adjusting the outlet water temperature of the evaporator of the air conditioning unit according to the outlet water temperature of the target evaporator.
According to the technical scheme, the condensing pressure of the air conditioning unit is obtained, and the air conditioning unit is limited to be loaded when the condensing pressure is judged to reach a first pressure threshold value; when the condensation pressure reaches a second pressure threshold value, the current evaporator water outlet temperature of the air conditioning unit is obtained, the target evaporator water outlet temperature is determined according to the current evaporator water outlet temperature and the preset correction temperature difference, then the evaporator water outlet temperature of the air conditioning unit is adjusted according to the target evaporator water outlet temperature, whether surging occurs or not is known in advance through judgment of the condensation pressure, the air conditioning unit is controlled in advance when surging possibly occurs, the running pressure ratio of a compressor is adjusted to be recovered to a set value, surging is avoided, the air conditioning unit can be protected, the service life of the air conditioning unit can be prolonged, the condition that the air conditioning unit is frequently stopped cannot occur, manual operation is not needed, and the system can be automatically adjusted.
An embodiment of a second aspect of the present invention provides an air conditioning unit control apparatus, including:
the condensation pressure acquisition module is used for acquiring the condensation pressure of the air conditioning unit;
the unit loading limiting module is used for limiting the loading of the air conditioning unit when the condensing pressure is judged to reach a first pressure threshold value;
the evaporator outlet water temperature acquisition module is used for acquiring the current evaporator outlet water temperature of the air conditioning unit when the condensation pressure is judged to reach a second pressure threshold value; the second pressure threshold is greater than the first pressure threshold;
the target evaporator outlet water temperature determining module is used for determining the target evaporator outlet water temperature according to the current evaporator outlet water temperature and the preset correction temperature difference;
and the evaporator outlet water temperature adjusting module is used for adjusting the evaporator outlet water temperature of the air conditioning unit according to the target evaporator outlet water temperature.
An embodiment of a third aspect of the present invention provides an air conditioning unit control system, including:
a memory;
a processor; and
a computer program; the computer program is stored in the memory and configured to be executed by the processor to implement the method as described above.
A fourth aspect embodiment of the invention provides a computer readable storage medium having a computer program stored thereon; the computer program is executed by a processor to implement the method as described above.
An embodiment of a fifth aspect of the present invention provides an air conditioning unit, including: compressor, condenser, evaporimeter and air conditioning unit control system as above.
Drawings
Fig. 1 is a flowchart of an air conditioning unit control method according to an embodiment of the present application;
fig. 2 is a flowchart of an air conditioning unit control method according to a second embodiment of the present application;
fig. 3 is a flowchart of an air conditioning unit control method according to a third embodiment of the present application;
fig. 4 is a schematic structural diagram of an air conditioning unit control device according to a fourth embodiment of the present application;
fig. 5 is a schematic structural diagram of an air conditioning unit control system provided in the fifth embodiment of the present application;
fig. 6 is a schematic structural diagram of an air conditioning unit according to a sixth embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Example one
The embodiment provides an air conditioning unit control method, which can be applied to a fixed-frequency or variable-frequency air conditioning unit, particularly to a fixed-frequency unit, can pre-judge the condition that a compressor is about to surge, and can avoid the compressor from surging through advanced treatment. The method provided by the embodiment can be executed by a processor in the air conditioning unit control system.
The method provided by the embodiment can be applied to control of an air conditioning unit, and the air conditioning unit comprises the following steps: the condenser and the evaporator. Taking the refrigeration function as an example: the evaporator is arranged indoors, when liquid refrigerant flows through the evaporator, the liquid refrigerant is vaporized, and heat is absorbed in the vaporization process, so that the indoor temperature is reduced. The gas output from the evaporator is converted into high-temperature and high-pressure gas through the compressor, the high-temperature and high-pressure gas is liquefied through the condenser, heat is released in the liquefying process, and the heat is discharged outdoors.
Fig. 1 is a flowchart of an air conditioning unit control method according to an embodiment of the present application. As shown in fig. 1, the method for controlling an air conditioning unit according to this embodiment includes:
and 101, acquiring the condensation pressure of the air conditioning unit.
The condensing pressure is the pressure of one side of the condenser of the air conditioning unit, and specifically, the air inlet pressure of the condenser can be collected to be used as the condensing pressure, and the air outlet pressure of the compressor can also be collected to be used as the condensing pressure. The pressure sensor capable of detecting gas pressure can be correspondingly arranged at the gas inlet of the condenser or the gas outlet of the compressor for detection. Alternatively, the gas pressure inside the condenser may be collected as the condensing pressure.
This step may be performed by a processor to which the pressure sensor sends the acquired pressure signal. The processor may pre-process the pressure signal acquired from the pressure sensor in advance, or a pre-processing circuit is disposed between the processor and the pressure sensor for pre-processing the pressure signal acquired by the pressure sensor, for example: and carrying out amplification, filtering and other processing.
After the preprocessed pressure signal is acquired, the magnitude of the pressure signal can be judged.
And 102, limiting the loading of the air conditioning unit when the condensing pressure reaches a first pressure threshold value.
The first pressure threshold value may be a fixed value, pre-stored in memory. The processor reads the first pressure threshold value from the memory and compares it to the condensing pressure. For example: and when the processor judges that the condensing pressure is greater than the first pressure threshold value, the loading of the air conditioning unit can be limited. The fixed value may be an absolute fixed value or a relative fixed value, for example: according to a relative fixed value corresponding to the temperature set by the user of the air conditioning unit, namely: the set temperature corresponds to the first pressure threshold value one to one.
Alternatively, the first pressure threshold value may be a real-time variable value, such as: the processor can acquire the working state parameters of the air conditioning unit according to the real-time variable numerical values of the working state parameters of the current air conditioning unit, and calculate the first pressure threshold value according to the working state parameters.
When the condensing pressure is too large, surging may occur, so that the loading of the air conditioning unit is limited, the condensing pressure is prevented from being further increased, and the surging can be prevented from occurring to a certain extent.
And limiting the loading of the air conditioning unit, in particular limiting the air conditioning unit to increase the refrigerating capacity or the heating capacity so as to avoid increasing the air inlet pressure of the compressor. In this embodiment, refrigeration is taken as an example, and limiting the loading of the air conditioning unit specifically is to limit the air conditioning unit to increase the refrigeration capacity and keep the existing refrigeration capacity.
The specific implementation process of step 102 may be:
the processor judges whether the condensation pressure is larger than a first pressure threshold value, if so, the processor continues to judge whether the condensation pressure is smaller than a second pressure threshold value, and if so, the process is executed. When the processor determines that the condensing pressure is greater than or equal to the second pressure threshold, step 103 is performed.
And 103, acquiring the current outlet water temperature of the evaporator of the air conditioning unit when the condensing pressure is judged to reach the second pressure threshold value.
The second pressure threshold value, similar to the first pressure threshold value, may be a fixed value and may be pre-stored in a memory. The processor reads the second pressure threshold value from the memory and compares it to the condensing pressure. The fixed value may be an absolute fixed value or a relative fixed value, for example: according to a relative fixed value corresponding to the temperature set by the user of the air conditioning unit, namely: the set temperature corresponds to the second pressure threshold value one to one.
Alternatively, the second pressure threshold value may be a real-time variable value, such as: the processor can acquire the working state parameters of the air conditioning unit according to the real-time variable numerical values of the working state parameters of the current air conditioning unit, and calculate the second pressure threshold value according to the working state parameters. The second pressure threshold is greater than the first pressure threshold.
The outlet water temperature of the evaporator is the temperature of the outlet end of the evaporator of the air conditioning unit, and a temperature sensor can be correspondingly arranged at the outlet end of the evaporator for detection.
This step may be performed by a processor to which the temperature sensor sends the collected temperature signal. The processor may pre-process the temperature signal acquired from the temperature sensor in advance, or a pre-processing circuit is disposed between the processor and the temperature sensor for pre-processing the temperature signal acquired by the temperature sensor, for example: and carrying out amplification, filtering and other processing.
The temperature sensor collects temperature signals in real time and sends the temperature signals to a temperature signal receiving end of the processor. The processor side has several processing modes for the temperature signal received by the temperature signal receiving end: one is that each received temperature signal is stored, and when step 103 is executed, the processor obtains the latest stored data from the memory; secondly, storing the currently received temperature signal and covering the temperature signal received at the previous moment, and when the step 103 is executed, acquiring the only temperature signal, namely the latest stored data, from the memory by the processor; and thirdly, the received temperature signal is not stored, and when the step 103 is executed, the processor directly obtains the current temperature signal from the temperature signal receiving end.
And step 104, determining the outlet water temperature of the target evaporator according to the outlet water temperature of the current evaporator and the preset correction temperature difference.
The preset corrected temperature difference may be a fixed value, and is pre-stored in the memory, and the processor reads the preset corrected temperature difference from the memory. The fixed value may be an absolute fixed value or a relative fixed value, for example: according to a relative fixed value corresponding to the temperature set by the user of the air conditioning unit, namely: the set temperature corresponds to the preset correction temperature difference one by one. Alternatively, the fixed value may be set by the user.
Alternatively, the preset corrected temperature difference may be a real-time variable value, such as: the processor can acquire the working state parameters of the air conditioning unit according to the real-time variable numerical values of the working state parameters of the current air conditioning unit, and calculate the preset correction temperature difference according to the working state parameters.
And the processor determines the target evaporator outlet water temperature according to the current evaporator outlet water temperature obtained in the step 103 and the preset correction temperature difference, and taking the refrigeration process as an example, the target evaporator outlet water temperature is greater than the current evaporator outlet water temperature.
And 105, adjusting the outlet water temperature of the evaporator of the air conditioning unit according to the outlet water temperature of the target evaporator.
Surge is most likely to occur when the condensing pressure is greater than the second pressure threshold. Therefore, the processor controls the air conditioner unit to increase the outlet water temperature of the evaporator to the target outlet water temperature of the evaporator, so as to increase the output pressure of the evaporator, namely the inlet pressure of the compressor, reduce the running pressure ratio of the compressor and avoid surging.
According to the technical scheme provided by the embodiment, the condensing pressure of the air conditioning unit is obtained, and the air conditioning unit is limited to be loaded when the condensing pressure is judged to reach a first pressure threshold value; when the condensation pressure reaches a second pressure threshold value, the current evaporator water outlet temperature of the air conditioning unit is obtained, the target evaporator water outlet temperature is determined according to the current evaporator water outlet temperature and the preset correction temperature difference, then the evaporator water outlet temperature of the air conditioning unit is adjusted according to the target evaporator water outlet temperature, whether surging occurs or not is known in advance through judgment of the condensation pressure, the air conditioning unit is controlled in advance when surging possibly occurs, the running pressure ratio of a compressor is adjusted to be recovered to a set value, surging is avoided, the reliability of the unit is improved, the service life of the air conditioning unit can be prolonged, the condition that the air conditioning unit is frequently stopped does not occur, manual operation is not needed, and the system can automatically adjust.
In step 104, the target evaporator outlet water temperature is determined according to the current evaporator outlet water temperature and a preset correction temperature difference, where the preset correction temperature difference may be set to a fixed value before leaving the factory, or may be changed by a user after leaving the factory. In the refrigeration process, the target evaporator outlet water temperature is greater than the current evaporator outlet water temperature, and the target evaporator outlet water temperature may be the product of the current evaporator outlet water temperature and the preset correction temperature difference, or may be the sum of the current evaporator outlet water temperature and the preset correction temperature difference. In this embodiment, the target evaporator outlet water temperature is the sum of the current evaporator outlet water temperature and the preset correction temperature difference, and step 104 may specifically be to calculate the sum of the current evaporator outlet water temperature and the preset correction temperature difference as the target evaporator outlet water temperature.
Example two
The embodiment optimizes the air conditioning unit control method on the basis of the embodiment.
Fig. 2 is a flowchart of an air conditioning unit control method according to a second embodiment of the present application. As shown in fig. 2, on the basis of the implementation manner provided in the first embodiment, the control method further includes:
and step 106, acquiring the evaporation pressure of the air conditioning unit.
The evaporating pressure is the pressure on one side of the evaporator of the air conditioning unit, and specifically, the outlet pressure of the evaporator can be collected as the evaporating pressure, and the inlet pressure of the compressor can also be collected as the evaporating pressure. The pressure sensor capable of detecting the gas pressure can be correspondingly arranged at the gas outlet of the evaporator or the gas inlet of the compressor for detection. Alternatively, the gas pressure inside the evaporator may be collected as the evaporation pressure.
This step may be performed by a processor to which the pressure sensor sends the acquired pressure signal. The processor may pre-process the pressure signal acquired from the pressure sensor in advance, or a pre-processing circuit is disposed between the processor and the pressure sensor for pre-processing the pressure signal acquired by the pressure sensor, for example: and carrying out amplification, filtering and other processing.
Step 106 may be performed before step 101, after step 101, or simultaneously with step 101.
And step 107, determining a first pressure threshold value according to the evaporation pressure and a first preset correction parameter.
The first preset correction parameter is a preset parameter, and may be an absolute fixed value or a relative fixed value. The absolute fixed value can be set before the air conditioning unit leaves the factory, and cannot be changed after leaving the factory. The relative fixed value may be changed after leaving the factory, may be changed by a user, or may be changed according to an operating state parameter of the air conditioning unit, but is relatively fixed in one execution cycle of the method provided in this embodiment.
And determining a first pressure threshold value according to the evaporation pressure and a first preset correction parameter, wherein the first pressure threshold value is changed according to the change of the evaporation pressure. The condensation pressure is judged by adopting the first pressure threshold value obtained in the step, so that the accuracy of pre-judging surge is improved.
For the first preset correction parameter, the first preset correction parameter may be set according to the operating state of the air conditioning unit, and this embodiment illustrates an implementation manner:
the first preset correction parameter may include: the method comprises the steps of local minimum atmospheric pressure, the maximum operation pressure ratio of a compressor in the air conditioning unit, relevant parameters of guide vanes in the air conditioning unit and a first pressure ratio correction coefficient.
Specifically, it can be calculated by the following formula:
P(a)＝(S(t)+PMin)×EMax×K×ξ1-PMin，
wherein P (a) is the first pressure threshold, S (t) is the current evaporation pressure, PMinAt local minimum atmospheric pressure, EMaxFor medium pressure of air conditioning unitsThe maximum operation pressure ratio of the compressor, K is the relevant parameter of the guide vane in the air conditioning unit, xi1The first pressure ratio correction parameter.
The above s (t) may be obtained by step 106. PMinThe parameters are fixed when the air conditioner assembly is fitted to a certain working area for the local minimum atmospheric pressure. EMaxThe parameter is the maximum operation pressure ratio of the compressor in the air conditioning unit, can be set according to the design parameter of the compressor, and can be set as a fixed value before the factory shipment.
K is the relevant parameter of stator in the air conditioning unit, and the aperture of stator is bigger, and the numerical value of K is bigger. The K determination process can be realized by detecting the opening degree of the guide vane and looking up a value corresponding to the current opening degree in a preset guide vane related parameter corresponding relation table to serve as the value of the K.
ξ1The first pressure ratio correction parameter may be 0.9 to 0.95, and may be set before shipment.
And step 108, determining a second pressure threshold value according to the evaporation pressure and a second preset correction parameter.
The second preset correction parameter is a preset parameter, and may be an absolute fixed value or a relative fixed value. The absolute fixed value can be set before the air conditioning unit leaves the factory, and cannot be changed after leaving the factory. The relative fixed value may be changed after leaving the factory, may be changed by a user, or may be changed according to an operating state parameter of the air conditioning unit, but is relatively fixed in one execution cycle of the method provided in this embodiment.
And determining a second pressure threshold value according to the evaporation pressure and a second preset correction parameter, wherein the second pressure threshold value is changed according to the change of the evaporation pressure. The condensation pressure is judged by adopting the second pressure threshold value obtained in the step, so that the accuracy of pre-judging surge is improved.
For the second preset correction parameter, the second preset correction parameter may be set according to the operating state of the air conditioning unit, and this embodiment illustrates an implementation manner:
the second preset correction parameter may include: the local minimum atmospheric pressure, the maximum operation pressure ratio of a compressor in the air conditioning unit, relevant parameters of guide vanes in the air conditioning unit and a second pressure ratio correction coefficient.
Specifically, it can be calculated by the following formula:
P(b)＝(S(t)+PMin)×EMax×K×ξ2-PMin
wherein P (b) is a second pressure threshold, S (t) is an evaporation pressure, PMinAt local minimum atmospheric pressure, EMaxIs the maximum operation pressure ratio of the compressor in the air conditioning unit, K is the relevant parameter of the guide vane in the air conditioning unit, xi2And the second pressure ratio correction parameter.
The above parameters S (t), PMin、EMaxAnd K is the same as the parameter used in calculating the first pressure threshold value p (a). And the second pressure ratio correction coefficient xi2Can be 0.95-1, and can be set before factory shipment.
EXAMPLE III
The embodiment optimizes the air conditioning unit control method on the basis of the embodiment.
Step 105 may be performed immediately after the above-described step 104 is performed. Alternatively, the following implementation may also be employed:
fig. 3 is a flowchart of an air conditioning unit control method according to a third embodiment of the present application. As shown in fig. 3, on the basis of the implementation manner provided by the above embodiment, after the step 104 is executed, the following steps may also be executed:
and step 109, judging whether the outlet water temperature of the target evaporator is greater than the outlet water temperature of the set evaporator.
The set outlet water temperature of the evaporator can be a preset numerical value, a fixed value set before delivery, or a user can change the outlet water temperature after delivery.
Judging the outlet water temperature of the target evaporator determined in the step 104, judging whether the outlet water temperature is greater than the outlet water temperature of the set evaporator, and if so, executing a step 105; if not, step 110 may be performed.
And 110, adjusting the outlet water temperature of the evaporator of the air conditioning unit according to the set outlet water temperature of the evaporator.
And when the outlet water temperature of the target evaporator is judged to be less than or equal to the outlet water temperature of the set evaporator, adjusting the outlet water temperature of the evaporator of the air conditioning unit according to the outlet water temperature of the set evaporator.
The implementation mode is equivalent to that the air conditioning unit is controlled by selecting a larger value between the outlet water temperature of the target evaporator and the set value, the evaporation pressure is increased as much as possible, the operation pressure ratio of the compressor is further reduced, and the surge is avoided through advanced operation.
Example four
Fig. 4 is a schematic structural diagram of an air conditioning unit control device according to a fourth embodiment of the present application. As shown in fig. 4, the present embodiment provides an air conditioning unit control apparatus including: a condensation pressure obtaining module 41, a unit loading limiting module 42, an evaporator outlet water temperature obtaining module 43, a target evaporator outlet water temperature determining module 44 and an evaporator outlet water temperature adjusting module 45.
The condensation pressure obtaining module 41 is configured to obtain a condensation pressure of the air conditioning unit. The unit loading limiting module 42 is configured to limit loading of the air conditioning unit when it is determined that the condensing pressure reaches the first pressure threshold. The evaporator outlet water temperature obtaining module 43 is configured to obtain a current evaporator outlet water temperature of the air conditioning unit when it is determined that the condensing pressure reaches the second pressure threshold; the second pressure threshold is greater than the first pressure threshold. The target evaporator outlet water temperature determination module 44 is configured to determine a target evaporator outlet water temperature according to the current evaporator outlet water temperature and a preset correction temperature difference. The evaporator outlet water temperature adjusting module 45 is used for adjusting the evaporator outlet water temperature of the air conditioning unit according to the target evaporator outlet water temperature.
According to the technical scheme provided by the embodiment, the condensing pressure of the air conditioning unit is obtained, and the air conditioning unit is limited to be loaded when the condensing pressure is judged to reach a first pressure threshold value; when the condensation pressure reaches a second pressure threshold value, the current evaporator water outlet temperature of the air conditioning unit is obtained, the target evaporator water outlet temperature is determined according to the current evaporator water outlet temperature and the preset correction temperature difference, then the evaporator water outlet temperature of the air conditioning unit is adjusted according to the target evaporator water outlet temperature, whether surging occurs or not is known in advance through judgment of the condensation pressure, the air conditioning unit is controlled in advance when surging possibly occurs, the running pressure ratio of a compressor is adjusted to be recovered to a set value, surging is avoided, the air conditioning unit can be protected, the service life of the air conditioning unit can be prolonged, the condition that the air conditioning unit is frequently stopped cannot occur, manual operation is not needed, and the system can be automatically adjusted.
On the basis of the technical scheme, the device further comprises: the device comprises an evaporation pressure acquisition module, a first pressure threshold value determination module and a second pressure threshold value determination module. The evaporation pressure acquisition module is used for acquiring the evaporation pressure of the air conditioning unit. The first pressure threshold value determining module is used for determining a first pressure threshold value according to the evaporation pressure and a first preset correction parameter. And the second pressure threshold value determining module is used for determining a second pressure threshold value according to the evaporation pressure and a second preset correction parameter.
The first preset correction parameter includes: the method comprises the steps of local minimum atmospheric pressure, the maximum operation pressure ratio of a compressor in the air conditioning unit, relevant parameters of guide vanes in the air conditioning unit and a first pressure ratio correction coefficient. The first pressure threshold value determining module specifically determines the first pressure threshold value by using the following formula:
P(a)＝(S(t)+PMin)×EMax×K×ξ1-PMin，
wherein P (a) is a first pressure threshold, S (t) is an evaporation pressure, PMinAt local minimum atmospheric pressure, EMaxIs the maximum operation pressure ratio of the compressor in the air conditioning unit, K is the relevant parameter of the guide vane in the air conditioning unit, xi1The first pressure ratio correction parameter.
The second preset correction parameter includes: the local minimum atmospheric pressure, the maximum operation pressure ratio of a compressor in the air conditioning unit, relevant parameters of guide vanes in the air conditioning unit and a second pressure ratio correction coefficient. The second pressure threshold value determining module specifically determines the second pressure threshold value by using the following formula:
P(b)＝(S(t)+PMin)×EMax×K×ξ2-PMin
wherein P (b) is a second pressure threshold, S (t) is an evaporation pressure, PMinAt local minimum atmospheric pressure, EMaxIs the maximum operation pressure ratio of the compressor in the air conditioning unit, K is the relevant parameter of the guide vane in the air conditioning unit, xi2And the second pressure ratio correction parameter.
The target evaporator outlet water temperature determination module 44 specifically includes: and calculating the sum of the current evaporator outlet water temperature and the preset correction temperature difference to serve as the target evaporator outlet water temperature.
The control device further includes: the judging module is used for judging whether the outlet water temperature of the target evaporator is greater than the outlet water temperature of the set evaporator or not, and triggering the evaporator outlet water temperature adjusting module 45 to adjust the outlet water temperature of the evaporator of the air conditioning unit according to the outlet water temperature of the target evaporator when the outlet water temperature of the target evaporator is judged to be greater than the outlet water temperature of the set evaporator; and when the outlet water temperature of the target evaporator is judged to be less than or equal to the outlet water temperature of the set evaporator, triggering the evaporator outlet water temperature adjusting module 45 to adjust the outlet water temperature of the evaporator of the air conditioning unit according to the outlet water temperature of the set evaporator.
The unit loading limiting module 42 is specifically configured to limit the air conditioning unit to increase the cooling capacity.
The air conditioning unit control device provided by the embodiment can execute the method provided by any one of the embodiments, and has the corresponding functional modules and beneficial effects.
EXAMPLE five
Fig. 5 is a schematic structural diagram of an air conditioning unit control system according to a fifth embodiment of the present application. As shown in fig. 5, the present embodiment provides an air conditioning unit control system, including: memory, processor, and computer programs. The computer program is stored in the memory and configured to be executed by the processor to implement the method as provided above, with corresponding functional blocks and advantageous effects to execute the method.
The present embodiment also provides a computer-readable storage medium having a computer program stored thereon; the computer program is executed by a processor to implement the method as provided above.
EXAMPLE six
Fig. 6 is a schematic structural diagram of an air conditioning unit according to a sixth embodiment of the present application. As shown in fig. 6, the present embodiment provides an air conditioning unit, including: a compressor 61, a condenser 62, an evaporator 63, and an air conditioning unit control system 64. The air conditioning unit control system 64 includes the air conditioning unit control system described above.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (14)
1. An air conditioning unit control method is characterized by comprising the following steps:
acquiring the condensing pressure of an air conditioning unit;
when the condensing pressure reaches a first pressure threshold value, limiting the loading of the air conditioning unit;
when the condensing pressure reaches a second pressure threshold value, acquiring the current outlet water temperature of the evaporator of the air conditioning unit; the second pressure threshold is greater than the first pressure threshold;
determining the outlet water temperature of a target evaporator according to the outlet water temperature of the current evaporator and a preset correction temperature difference;
and adjusting the outlet water temperature of the evaporator of the air conditioning unit according to the outlet water temperature of the target evaporator.
2. The method of claim 1, further comprising:
acquiring the evaporation pressure of an air conditioning unit;
determining a first pressure threshold value according to the evaporation pressure and a first preset correction parameter;
and determining a second pressure threshold value according to the evaporation pressure and a second preset correction parameter.
3. The method of claim 2, wherein the first preset modification parameter comprises: the method comprises the steps of local minimum atmospheric pressure, the maximum operation pressure ratio of a compressor in the air conditioning unit, relevant parameters of guide vanes in the air conditioning unit and a first pressure ratio correction coefficient.
4. A method according to claim 3, characterized in that said first pressure threshold value is determined as a function of said evaporation pressure and a first preset correction parameter, in particular by using the following formula:
P(a)＝(S(t)+PMin)×EMax×K×ξ1-PMin，
wherein P (a) is a first pressure threshold, S (t) is an evaporation pressure, PMinAt local minimum atmospheric pressure, EMaxIs the maximum operation pressure ratio of the compressor in the air conditioning unit, K is the relevant parameter of the guide vane in the air conditioning unit, xi1The first pressure ratio correction parameter.
5. The method of claim 2, wherein the second predetermined modification parameter comprises: the local minimum atmospheric pressure, the maximum operation pressure ratio of a compressor in the air conditioning unit, relevant parameters of guide vanes in the air conditioning unit and a second pressure ratio correction coefficient.
6. The method according to claim 5, wherein the second pressure threshold value is determined on the basis of the evaporation pressure and a second preset correction parameter, in particular using the following formula:
P(b)＝(S(t)+PMin)×EMax×K×ξ2-PMin
wherein P (b) is a second pressure threshold, S (t) is an evaporation pressure, PMinAt local minimum atmospheric pressure, EMaxIs the maximum operation pressure ratio of the compressor in the air conditioning unit, K is the relevant parameter of the guide vane in the air conditioning unit, xi2And the second pressure ratio correction parameter.
7. The method according to claim 1, wherein the target evaporator leaving water temperature is determined according to the current evaporator leaving water temperature and a preset correction temperature difference, and specifically comprises:
and calculating the sum of the current evaporator outlet water temperature and a preset correction temperature difference to be used as the target evaporator outlet water temperature.
8. The method of claim 1, after determining a target evaporator leaving water temperature based on the current evaporator leaving water temperature and a preset correction temperature difference, further comprising:
and judging whether the outlet water temperature of the target evaporator is greater than the outlet water temperature of the set evaporator or not, and adjusting the outlet water temperature of the evaporator of the air conditioning unit according to the outlet water temperature of the target evaporator when the outlet water temperature of the target evaporator is greater than the outlet water temperature of the set evaporator.
9. The method of claim 8, further comprising:
and when the outlet water temperature of the target evaporator is judged to be less than or equal to the outlet water temperature of the set evaporator, adjusting the outlet water temperature of the evaporator of the air conditioning unit according to the outlet water temperature of the set evaporator.
10. The method according to claim 1, characterized in that limiting the loading of the air conditioning unit is in particular:
and limiting the air conditioning unit to increase the refrigerating capacity.
11. An air conditioning unit control apparatus characterized by comprising:
the condensation pressure acquisition module is used for acquiring the condensation pressure of the air conditioning unit;
the unit loading limiting module is used for limiting the loading of the air conditioning unit when the condensing pressure is judged to reach a first pressure threshold value;
the evaporator outlet water temperature acquisition module is used for acquiring the current evaporator outlet water temperature of the air conditioning unit when the condensation pressure is judged to reach a second pressure threshold value; the second pressure threshold is greater than the first pressure threshold;
the target evaporator outlet water temperature determining module is used for determining the target evaporator outlet water temperature according to the current evaporator outlet water temperature and the preset correction temperature difference;
and the evaporator outlet water temperature adjusting module is used for adjusting the evaporator outlet water temperature of the air conditioning unit according to the target evaporator outlet water temperature.
12. An air conditioning unit control system, comprising:
a memory;
a processor; and
a computer program; the computer program is stored in the memory and configured to be executed by the processor to implement the method of any one of claims 1-10.
13. A computer-readable storage medium, having stored thereon a computer program; the computer program is executed by a processor to implement the method according to any of claims 1-10.
14. An air conditioning assembly, comprising: a compressor, a condenser, an evaporator, and an air conditioning unit control apparatus according to claim 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811548513.0A CN109612014B (en) | 2018-12-18 | 2018-12-18 | Air conditioning unit control method, device and system and air conditioning unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811548513.0A CN109612014B (en) | 2018-12-18 | 2018-12-18 | Air conditioning unit control method, device and system and air conditioning unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109612014A CN109612014A (en) | 2019-04-12 |
| CN109612014B true CN109612014B (en) | 2020-12-04 |
Family
ID=66010486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811548513.0A Active CN109612014B (en) | 2018-12-18 | 2018-12-18 | Air conditioning unit control method, device and system and air conditioning unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109612014B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112283817A (en) * | 2020-09-17 | 2021-01-29 | 珠海格力电器股份有限公司 | Central air-conditioning system and control method thereof |
| CN112815489A (en) * | 2021-01-19 | 2021-05-18 | 珠海格力电器股份有限公司 | Control method and device of air-cooled water chilling unit and air-cooled water chilling unit |
| CN114226673B (en) * | 2021-11-22 | 2023-04-25 | 中冶赛迪技术研究中心有限公司 | Temperature control method for cooling water of continuous casting crystallizer, storage medium and electronic terminal |
| CN114811839B (en) * | 2022-05-10 | 2023-06-02 | 重庆美的通用制冷设备有限公司 | Central air conditioner, control method and device of central air conditioner and readable storage medium |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI379041B (en) * | 2009-02-13 | 2012-12-11 | Ind Tech Res Inst | Method and system for controling compressor |
| WO2017007708A1 (en) * | 2015-07-06 | 2017-01-12 | Johnson Controls Technology Company | Capacity control system and method for multi-stage centrifugal compressor |
| JP6778884B2 (en) * | 2017-01-16 | 2020-11-04 | パナソニックＩｐマネジメント株式会社 | Refrigeration cycle equipment |
| CN107218705B (en) * | 2017-06-23 | 2020-01-14 | 广东美的暖通设备有限公司 | Control method of outdoor motor, air conditioner and storage medium |
| CN107829969B (en) * | 2017-07-31 | 2020-12-08 | 青岛海尔空调电子有限公司 | Anti-surge control method and system for magnetic suspension centrifugal air conditioning unit |
-
2018
- 2018-12-18 CN CN201811548513.0A patent/CN109612014B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109612014A (en) | 2019-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109612014B (en) | Air conditioning unit control method, device and system and air conditioning unit | |
| WO2015021853A1 (en) | Control method, control device for inverter air conditioner and inverter air conditioner | |
| CN104634033B (en) | A kind of electronic expansion valve controls system and method | |
| CN108800465B (en) | Air conditioner control method, air conditioner control device and electronic equipment | |
| CN112032962A (en) | Mobile air conditioner control method and mobile air conditioner with same | |
| CN109373497B (en) | Refrigerant quantity adjusting method, device and system of temperature adjusting equipment and air conditioner | |
| CN103256767B (en) | Method for controlling evaporating temperature of water-side heat exchanger of air conditioner and air conditioner | |
| CN109059201B (en) | Control method and device of air conditioner and air conditioner with control device | |
| CN113237203B (en) | Electronic expansion valve control method and related equipment | |
| CN113175733B (en) | Method for calculating capacity energy efficiency of air conditioner, air conditioner and storage medium | |
| CN109855251B (en) | Exhaust superheat correction method and device for air conditioner, computer product and air conditioner | |
| CN109340992B (en) | Operation method and system for controlling reliability of air conditioner and air conditioner | |
| CN112032963A (en) | Mobile air conditioner control method and mobile air conditioner with same | |
| CN110848928B (en) | Air conditioner and control method and device thereof | |
| CN114811868B (en) | Control method and device for electronic expansion valve and multi-split system | |
| CN107490051B (en) | Mobile air conditioner and energy-saving control method and device thereof | |
| CN111678240B (en) | Operation control method of air conditioner, air conditioner and readable storage medium | |
| CN112503650A (en) | Water condensing device, control method, control device, electric appliance and storage medium | |
| CN109028453B (en) | Air conditioner and air conditioner control method | |
| CN112728655B (en) | Outdoor unit electric control temperature rise control method and device and air conditioner | |
| CN111412593B (en) | Liquid impact prevention control method and device for air conditioner, storage medium and air conditioner | |
| CN110131833A (en) | High-temperature protection method, device, air conditioner and computer readable storage medium | |
| CN117190337A (en) | Dehumidification control method and device for air conditioner, air conditioner and storage medium | |
| CN114353252A (en) | Air conditioner control method and device, air conditioner and storage medium | |
| CN114216213B (en) | Defrosting control method of air conditioner and air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20190412 Assignee: Shanghai Meikong Intelligent Building Co.,Ltd. Assignor: CHONGQING MIDEA GENERAL REFRIGERATION EQUIPMENT Co.,Ltd. Contract record no.: X2023990000454 Denomination of invention: Air conditioning unit control methods, devices, systems, and air conditioning units Granted publication date: 20201204 License type: Common License Record date: 20230508 |
|
| EE01 | Entry into force of recordation of patent licensing contract |