CN112304152B - Heat exchange system control method, device, equipment, system and storage medium - Google Patents
Heat exchange system control method, device, equipment, system and storage medium Download PDFInfo
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- CN112304152B CN112304152B CN202011167312.3A CN202011167312A CN112304152B CN 112304152 B CN112304152 B CN 112304152B CN 202011167312 A CN202011167312 A CN 202011167312A CN 112304152 B CN112304152 B CN 112304152B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
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- 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
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- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- 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
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Combustion & Propulsion (AREA)
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- Thermal Sciences (AREA)
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- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
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Abstract
The invention discloses a control method of a heat exchange system, wherein the heat exchange system comprises a target heat exchanger, n heat exchange pipelines extending from a first end of the target heat exchanger to a second end of the target heat exchanger are arranged in the target heat exchanger, n is an integer greater than 1, and each heat exchange pipeline is provided with an electronic expansion valve; the heat exchange system control method comprises the following steps: acquiring temperature information of each heat exchange pipeline; based on the temperature information of each heat exchange pipeline, the opening degree of each electronic expansion valve is controlled, so that the temperature of each heat exchange pipeline is adjusted, the temperature of each heat exchange pipeline is balanced, the manufacturing period is shortened, the manufacturing difficulty is reduced, and the electronic expansion valve is suitable for different environments. The invention also discloses a control device, equipment and a storage medium of the heat exchange system, which not only can balance the temperature of each heat exchange pipeline in the target heat exchanger, shorten the manufacturing period and reduce the manufacturing difficulty, but also can be suitable for different environments.
Description
Technical Field
The invention relates to the field of heat exchange, in particular to a heat exchange system control method, a heat exchange system control device, heat exchange equipment, a heat exchange system control system and a storage medium.
Background
Heat exchangers such as condensers and evaporators are used as core devices of cooling and heating apparatuses, and have a significant role in refrigerators, air conditioners, and the like. Uneven temperature of each branch in the heat exchanger can cause a series of problems of uneven frosting, incomplete defrosting, low energy efficiency, disordered system control parameters and the like.
At present, in order to make the temperature of each branch in the heat exchanger uniform, capillaries with different lengths or specifications are generally added in each branch, but in the mode, a plurality of tests are needed in the early stage to confirm the capillary with a proper specification, so that the manufacturing period is long, moreover, the production consistency is also extremely high, and meanwhile, the specification and the length of the capillary are determined under certain conditions, so that the capillary can not adapt to ever-changing environments, and the effect is poor.
Disclosure of Invention
The invention mainly aims to provide a heat exchange system control method, a heat exchange system control device, equipment, a storage medium and a heat exchange system, and aims to solve the technical problem that in the prior art, the temperature of each branch in a heat exchanger is uneven.
In order to achieve the above object, the present invention provides a method for controlling a heat exchange system, where the heat exchange system includes a target heat exchanger, n heat exchange pipes extending from a first end of the target heat exchanger to a second end of the target heat exchanger are arranged in the target heat exchanger, n is an integer greater than 1, and each heat exchange pipe is provided with an electronic expansion valve;
the heat exchange system control method comprises the following steps:
acquiring temperature information of each heat exchange pipeline;
and controlling the opening degree of each electronic expansion valve based on the temperature information.
In addition, in order to achieve the above object, the present invention further provides a control device for a heat exchange system, where the heat exchange system includes a target heat exchanger, n heat exchange pipes extending from a first end of the target heat exchanger to a second end of the target heat exchanger are arranged in the target heat exchanger, n is an integer greater than 1, and each heat exchange pipe is provided with an electronic expansion valve;
the heat exchange system control device comprises:
the acquisition module is used for acquiring the temperature information of each heat exchange pipeline;
and the adjusting module is used for adjusting the opening degree of each electronic expansion valve based on the temperature information.
In addition, in order to achieve the above object, the present invention further provides a heat exchange system control apparatus, including: the system comprises at least one processor, a memory and a heat exchange system control program stored on the memory and capable of running on the processor, wherein the heat exchange system control program is configured to realize the steps of the heat exchange system control method.
In addition, in order to achieve the above object, the present invention further provides a heat exchange system, including: a target heat exchanger and a heat exchange system control device;
n heat exchange pipelines extending from the first end of the target heat exchanger to the second end of the target heat exchanger are arranged in the target heat exchanger, wherein n is an integer larger than 1, and each heat exchange pipeline is provided with an electronic expansion valve;
the heat exchange system control device is used for acquiring the temperature information of each heat exchange pipeline; and controlling the opening degree of each electronic expansion valve based on the temperature information.
In addition, in order to achieve the above object, the present invention further provides a storage medium, wherein the storage medium stores a heat exchange system control program, and the heat exchange system control program implements the steps of the heat exchange system control method when executed by a processor.
The technical scheme of the invention provides a control method of a heat exchange system, wherein the heat exchange system comprises a target heat exchanger, n heat exchange pipelines extending from a first end of the target heat exchanger to a second end of the target heat exchanger are arranged in the target heat exchanger, n is an integer larger than 1, and each heat exchange pipeline is provided with an electronic expansion valve; the control method of the heat exchange system comprises the following steps: acquiring temperature information of each heat exchange pipeline; the opening degree of each electronic expansion valve is controlled based on the temperature information of each heat exchange pipeline, and the opening degree of each electronic expansion valve determines the flow rate of each heat exchange pipeline, so that the flow rate of each heat exchange pipeline can influence the temperature of the heat exchange pipeline.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic view of a first structure of a heat exchange system according to a first embodiment of the present invention;
fig. 2 is a schematic flow chart of a heat exchange system control method according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of a second structure of the heat exchange system according to the first embodiment of the present invention;
FIG. 4 is a schematic flow chart of a heat exchange system control method according to a second embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a heat exchange system according to a third embodiment of the present invention;
FIG. 6 is a schematic flow chart of a heat exchange system control method according to a third embodiment of the present invention;
fig. 7 is a schematic flow chart of a heat exchange system control method according to a fourth embodiment of the present invention;
FIG. 8-1 is a schematic view of a first structure of a heat exchange system according to a fifth embodiment of the present invention;
fig. 8-2 is a schematic view of a second structure of a heat exchange system according to a fifth embodiment of the present invention;
fig. 9 is a schematic block diagram of a control device of a heat exchange system according to a sixth embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to solve the technical problems of poor effect, high manufacturing difficulty and long manufacturing period of a mode of improving uneven temperature of each branch in a heat exchanger by arranging a capillary tube in the prior art, the first embodiment of the invention is provided.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a heat exchange system according to a first embodiment of the present invention, where the heat exchange system includes a target heat exchanger 10, n heat exchange pipes 11 extending from a first end of the target heat exchanger 10 to a second end of the target heat exchanger are disposed inside the target heat exchanger 10, and each heat exchange pipe 11 is provided with an electronic expansion valve 12.
It should be noted that the heat exchange system may be any heat exchange system including the above target heat exchanger, for example, an air conditioning system, a refrigerator heat exchange system, and the like.
The target heat exchanger 10 may be a condenser, an evaporator, or the like.
In some embodiments, referring to fig. 1, the electronic expansion valve 12 may be disposed outside the target heat exchanger 10 as long as the electronic expansion valve 12 is connected to the heat exchange pipe 11. Alternatively, the electronic expansion valve 12 may be provided inside the target heat exchanger 10.
The electronic expansion valves 12 may be disposed at a first end of the target heat exchanger 10, or may be disposed at a second end of the target heat exchanger 10.
In some embodiments, the heat exchange system further comprises a heat exchange system control device to implement the following steps of the heat exchange system control method.
Referring to fig. 2, fig. 2 is a schematic flow chart of a heat exchange system control method according to a first embodiment of the present invention, where the heat exchange system control method includes:
step S10: and acquiring temperature information of each heat exchange pipeline.
In this embodiment, temperature information of each heat exchange pipe is obtained. Wherein the temperature information includes an inlet pipe temperature and an outlet pipe temperature. It should be understood that the inlet tube temperature is the temperature at the inlet end of the heat exchange tube and the outlet tube temperature is the temperature at the outlet end of the heat exchange tube.
In some embodiments, temperature information of each heat exchange tube may be acquired by a temperature sensor. Referring to fig. 3, two ends of each heat exchange pipe 11 may be respectively provided with a temperature sensor 13 for acquiring an inlet pipe temperature and an outlet pipe temperature of each heat exchange pipe 11.
Step S20: the opening degree of each electronic expansion valve is controlled based on the temperature information.
In this embodiment, after the temperature information of each heat exchange pipe is obtained, the opening degree of each electronic expansion valve is controlled based on the temperature information of each heat exchange pipe.
In some embodiments, step S20 comprises:
step S21: and calculating the absolute value of the difference value between the inlet pipe temperature and the outlet pipe temperature of each heat exchange pipeline to obtain the absolute value of the temperature difference.
After the inlet pipe temperature and the outlet pipe temperature of each heat exchange pipeline are obtained, the difference value of the inlet pipe temperature and the outlet pipe temperature of each heat exchange pipeline is calculated, and the absolute value of the difference value is obtained to obtain the absolute value of the temperature difference. That is, the absolute value of the temperature difference of a certain heat exchange pipe = | the inlet pipe temperature of the heat exchange pipe-the outlet pipe temperature of the heat exchange pipe |, wherein | x | is an absolute value of x. For example, if the inlet pipe temperature of a certain heat exchange pipe is 30 degrees celsius and the outlet pipe temperature is 20 degrees celsius, the absolute value of the temperature difference of the heat exchange pipe is 10.
Step S22: and controlling the opening degree of each electronic expansion valve according to the absolute value of the temperature difference of each heat exchange pipeline.
And after the absolute value of the temperature difference of each heat exchange pipeline is obtained, controlling each electronic expansion valve according to the absolute value of the temperature difference of each heat exchange pipeline.
In some embodiments, step S22 comprises:
step S221: and calculating the average value of the absolute values of the temperature differences to obtain the average value of the temperature differences.
In this embodiment, after the absolute value of the temperature difference of each heat exchange pipe is obtained, an average value is calculated according to the absolute value of the temperature difference of each heat exchange pipe, so as to obtain an average value of the temperature difference.
For example, assuming that n is 4, that is, the target heat exchanger includes 4 heat exchange pipes, and the temperature information of each heat exchange pipe is shown in table 1, the average value of the temperature difference = (10 +13+15+ 12)/4 =12.5.
TABLE 1
Step S222: and adjusting the opening degree of the corresponding electronic expansion valve according to the average temperature difference value and the absolute temperature difference value.
In some embodiments, step S222 includes:
step 1: a target opening value of each electronic expansion valve is obtained based on the following formula.
X i ＝X i current +μ×([T Temperature difference i ]-[T Mean temperature difference ])
Wherein the value range of i is [1, n ]]And the device is used for identifying the ith heat exchange pipeline. X i The target opening value of the electronic expansion valve corresponding to the ith heat exchange pipeline is obtained; x i current is And the current opening value of the electronic expansion valve corresponding to the ith heat exchange pipeline is obtained. Mu is a preset first coefficient, and the value of mu can be flexibly set according to actual needs. T is Temperature difference i The absolute value of the temperature difference corresponding to the ith heat exchange pipeline is T Mean temperature difference The average value of the temperature difference is obtained.
For better understanding, it is assumed here that n is 4, that is, the target heat exchanger includes 4 heat exchange tubes, the temperature information of each heat exchange tube and the current opening degree of the electronic expansion valve are as shown in table 2, μ is 0.2, and the target opening degree value X of the electronic expansion valve corresponding to the 1 st heat exchange tube is 1 Please refer to the calculation method of the target opening degree value of the electronic expansion valve corresponding to the 2 nd, 3 rd and 4 th heat exchange pipelines, where =2+0.2 x (10-12.5) =1.5See the calculation method of the target opening degree value of the electronic expansion valve corresponding to the 1 st heat exchange pipeline, which is not described herein again.
TABLE 2
And 2, step: based on each target opening value, the opening degree of the corresponding electronic expansion valve is controlled.
After the target opening degree value of the electronic expansion valve corresponding to each heat exchange pipeline is obtained, the opening degree of the electronic expansion valve is adjusted to the target opening degree value, for example, referring to table 2, the target opening degree value corresponding to the 1 st heat exchange pipeline is 1.5, and therefore, the opening degree of the electronic expansion valve corresponding to the 1 st heat exchange pipeline is adjusted from 2 to 1.5.
According to the formula, when the absolute value of the temperature difference of the heat exchange pipeline is larger than the average value of the temperature difference, the opening degree of the corresponding electronic expansion valve is increased, and when the absolute value of the temperature difference of the heat exchange pipeline is smaller than the average value of the temperature difference, the opening degree of the corresponding electronic expansion valve is reduced. When the absolute value of the temperature difference of the heat exchange pipeline is larger than the average value of the temperature difference, the heat exchange capacity of the heat exchange pipeline is higher, so that the opening degree of the corresponding electronic expansion valve is increased, the heat exchange media entering the heat exchange pipeline are increased, and the absolute value of the temperature difference of the heat exchange pipeline is reduced; when the absolute value of the temperature difference of the heat exchange pipeline is smaller than the average value of the temperature difference, the heat exchange capacity of the heat exchange pipeline is low, so that the opening degree of the corresponding electronic expansion valve is reduced, the heat exchange medium entering the heat exchange pipeline is reduced, and the absolute value of the temperature difference of the heat exchange pipeline is increased; so that the absolute value of the temperature difference of each heat exchange pipeline tends to the average value of the temperature difference.
In some embodiments, step S222 includes: if the absolute value of the temperature difference is larger than the average value of the temperature difference, increasing the opening of the corresponding electronic expansion valve; and if the absolute value of the temperature difference is smaller than the average value of the temperature difference, reducing the opening degree of the corresponding electronic expansion valve. For example, referring to table 1, since the absolute value of the temperature difference between the heat exchange pipes 1 and 4 is smaller than the average value of the temperature difference, the opening degree of the electronic expansion valve corresponding to the heat exchange pipe 1 is reduced; because the absolute value of the temperature difference between the heat exchange pipelines 2 and 3 is larger than the average value of the temperature difference, the opening degree of the electronic expansion valve corresponding to the heat exchange pipeline 1 is increased.
When the opening degree corresponding to the electronic expansion valve is increased, a preset first ratio may be increased on the basis of the current opening degree, and for the preset first ratio, the preset first ratio may be flexibly set according to actual needs, for example, if the current opening degree of the electronic expansion valve corresponding to the heat exchange pipeline 3 is 5 and the preset first ratio is 2%, after adjustment, the opening degree of the electronic expansion valve corresponding to the heat exchange pipeline 3 is 5.1=5 +0.02. Or, when the opening degree corresponding to the electronic expansion valve is increased, a preset first opening degree value may be increased on the basis of the current opening degree, and for the preset first opening degree value, the preset first opening degree value may be flexibly set according to actual needs, for example, if the current opening degree of the electronic expansion valve corresponding to the heat exchange pipeline 2 is 6 and the preset first opening degree value is 0.3, after the adjustment, the opening degree of the electronic expansion valve corresponding to the heat exchange pipeline 2 is 6.3=6+0.3.
When the opening degree corresponding to the electronic expansion valve is decreased, the preset second proportion may be decreased on the basis of the current opening degree, and for the preset second proportion, the preset second proportion may be flexibly set according to actual needs, for example, if the current opening degree of the electronic expansion valve corresponding to the heat exchange pipeline 1 is 3 and the preset second proportion is 4%, after the adjustment, the opening degree of the electronic expansion valve corresponding to the heat exchange pipeline 1 is =3-3 × 0.04=2.88. Or, when the opening degree corresponding to the electronic expansion valve is decreased, the preset second opening degree value may be decreased on the basis of the current opening degree, and for the preset second opening degree value, the preset second opening degree value may be flexibly set according to actual needs, for example, if the current opening degree of the electronic expansion valve corresponding to the heat exchange pipeline 4 is 5 and the preset second opening degree value is 0.4, after the adjustment, the opening degree of the electronic expansion valve corresponding to the heat exchange pipeline 4 is 4.6=5-0.4.
In the control method of the heat exchange system provided by this embodiment, the heat exchange system includes a target heat exchanger, n heat exchange pipelines extending from a first end of the target heat exchanger to a second end of the target heat exchanger are arranged in the target heat exchanger, n is an integer greater than 1, and each heat exchange pipeline is provided with an electronic expansion valve; the control method of the heat exchange system comprises the following steps: acquiring temperature information of each heat exchange pipeline; based on the temperature information of each heat exchange pipeline, the opening degree of each electronic expansion valve is controlled, the opening degree of each electronic expansion valve determines the flow rate of the heat exchange pipeline, and the flow rate of the heat exchange pipeline can influence the temperature of the heat exchange pipeline.
A second embodiment of the present invention is proposed based on the first embodiment. In this embodiment, referring to fig. 4, before step S222, the method for controlling a heat exchange system further includes:
step S30: and judging whether the absolute value of the difference value between the absolute value of the temperature difference and the average value of the temperature difference is greater than or equal to a preset threshold value or not.
In order to avoid the situation that the difference between the absolute value of the temperature difference and the average value of the temperature difference of the heat exchange pipes is not large, the opening adjustment of the corresponding electronic expansion valve is small, and power consumption is wasted, in this embodiment, it may be further determined whether the absolute value of the difference between the absolute value of the temperature difference and the average value of the temperature difference of each heat exchange pipe is greater than or equal to a preset threshold. The preset threshold value can be flexibly set according to actual needs, and for example, can be set to 1, 2, 3, and the like.
Step S40: if yes, go to step S222.
If the absolute value of the difference between the absolute value of the temperature difference and the average value of the temperature difference of a certain heat exchange pipe is greater than or equal to the preset threshold, step S222 is executed to adjust the opening of the electronic expansion valve corresponding to the heat exchange pipe according to the average value of the temperature difference and the absolute value of the temperature difference of the heat exchange pipe. For example, assuming that the preset threshold is 2, as shown in table 1, since the absolute value of the difference between the absolute value of the temperature difference and the average value of the temperature difference of the heat exchange pipeline 1 is 2.5, which is greater than the preset threshold, the opening degree of the electronic expansion valve corresponding to the heat exchange pipeline 1 is adjusted according to the average value of the temperature difference and the absolute value of the temperature difference of the heat exchange pipeline 1; since the absolute value of the difference between the absolute value of the temperature difference and the average value of the temperature difference of the heat exchange pipeline 3 is 2.5, which is greater than the preset threshold value, the opening degree of the electronic expansion valve corresponding to the heat exchange pipeline 3 is adjusted according to the average value of the temperature difference and the absolute value of the temperature difference of the heat exchange pipeline 3; since the absolute value of the difference between the absolute value of the temperature difference and the average value of the temperature difference of the heat exchange pipeline 2 is 0.5, which is smaller than the preset threshold value, the opening degree of the electronic expansion valve corresponding to the heat exchange pipeline 2 is not adjusted; since the absolute value of the difference between the absolute value of the temperature difference and the average value of the temperature difference of the heat exchange pipeline 4 is 0.5 and is smaller than the preset threshold value, the opening degree of the electronic expansion valve corresponding to the heat exchange pipeline 4 may not be adjusted.
In the control method of the heat exchange system provided in this embodiment, when the difference between the absolute temperature difference value and the average temperature difference value of the heat exchange pipeline is large, the opening degree of the electronic expansion valve corresponding to the heat exchange pipeline is adjusted based on the absolute temperature difference value and the average temperature difference value of the heat exchange pipeline; when the difference between the absolute temperature difference value and the average temperature difference value of the heat exchange pipeline is small, the opening degree of the electronic expansion valve corresponding to the heat exchange pipeline is not increased, and therefore power consumption is saved.
A third embodiment of the present invention is proposed based on the first embodiment. In this embodiment, the heat exchange system is an air conditioning system, and as shown in fig. 5, the air conditioning system further includes: a four-way valve 14 connected to a second end of the target heat exchanger 10, a designated heat exchanger 15 connected to the four-way valve 14 and a first end of the target heat exchanger 10, a compressor 16 connected to the four-way valve 14, and a second electronic expansion valve 17, wherein a discharge end of the compressor 16 is connected to the first end of the target heat exchanger 10 through the second electronic expansion valve 17. The discharge end and the suction end of the compressor 16 are connected to the four-way valve 14, respectively.
It should be understood that the air conditioning system includes an indoor heat exchanger and an outdoor heat exchanger, the indoor heat exchanger being a heat exchanger disposed indoors; the outdoor heat exchanger is a heat exchanger arranged outdoors.
In this embodiment, the target heat exchanger 10 may be an indoor heat exchanger, and in this case, the heat exchanger 15 is designated as an outdoor heat exchanger. The target heat exchanger 10 may be an outdoor heat exchanger, and in this case, the heat exchanger 15 is designated as an indoor heat exchanger.
In some embodiments, to facilitate connection, referring to fig. 5, a flow splitter 18 is provided at a first end of the target heat exchanger 10 and a gas header 19 is provided at a second end of the target heat exchanger 10. At this time, the discharge end of the compressor 16 is connected to the first end of the target heat exchanger 10 through the second electronic expansion valve 17 and the flow divider 18.
In this embodiment, after step S10, referring to fig. 6, the method for controlling a heat exchange system further includes:
step S50: and acquiring the outer ring temperature.
Wherein the outer ring temperature is the temperature of the external environment where the target heat exchanger is located. If the target heat exchanger is an outdoor heat exchanger, the outer ring temperature is the outdoor environment temperature; if the target heat exchanger is an indoor heat exchanger, the outer ring temperature is the indoor ambient temperature.
In this embodiment, step S50 and step S20 may be executed simultaneously, that is, in parallel. Alternatively, step S20 may be executed first, and then step S50 may be executed; alternatively, step S20 may be performed after step S50 is performed.
In some embodiments, step S50 comprises: if the target heat exchanger is an indoor heat exchanger, acquiring the outer ring temperature when the air conditioning system is in a refrigeration mode; or if the target heat exchanger is an outdoor heat exchanger, acquiring the outer ring temperature when the air conditioning system is in a heating mode. When the target heat exchanger is the indoor heat exchanger, the temperature of the outer ring is obtained when the air conditioning system is in the refrigeration mode, and the second electronic expansion valve is controlled according to the temperature of the outer ring and the temperature information of each heat exchange pipeline of the target heat exchanger, so that high-temperature heat exchange media in the compressor enter the target heat exchanger to defrost the target heat exchanger; when the target heat exchanger is the outdoor heat exchanger, the temperature of the outer ring is acquired when the air conditioning system is in the heating mode, and the second electronic expansion valve is controlled according to the temperature of the outer ring and the temperature information of each heat exchange pipeline of the target heat exchanger, so that high-temperature heat exchange media in the compressor enter the target heat exchanger to defrost the target heat exchanger.
Step S60: and controlling the second electronic expansion valve according to the outer ring temperature and the temperature information.
In this embodiment, the temperature information includes the pipe inlet temperature of each heat exchange pipe, and the second electronic expansion valve is controlled according to the outer ring temperature and the pipe inlet temperature of each heat exchange pipe.
In some embodiments, step S60 comprises:
step S601: and judging whether the minimum value of the temperatures of the inlet pipes is smaller than the difference obtained by subtracting the first preset value from the temperature of the outer ring.
The first preset value can be flexibly set according to actual needs, wherein the first preset value can be flexibly set according to actual needs, and for example, the value range can be 8-10 ℃.
In this embodiment, the minimum value is determined from the inlet pipe temperatures of the heat exchange pipes, and then it is determined whether the minimum value is smaller than the difference obtained by subtracting the first preset value from the outer ring temperature, that is, it is determined that [ T In advance of min ]<([T Outer ring ]-A) is true, wherein T For min Determining a minimum value, T, of the inlet temperatures of the heat exchange lines Outer ring The outer loop temperature is denoted as A, which is a first preset value.
Step S602: and if so, opening the second electronic expansion valve.
If the minimum value of the temperatures of the inlet pipes is less than the difference obtained by subtracting the first preset value from the outer ring temperature, namely [ T In advance of min ]<([T Outer ring ]And A), if the temperature of the heat exchange medium in the compressor is higher than the temperature of the heat exchange medium in the compressor, opening a second electronic expansion valve to enable the heat exchange medium in the compressor to enter each heat exchange pipeline of the target heat exchanger, increasing the temperature of each heat exchange pipeline, and defrosting each heat exchange pipeline.
If the minimum value of the temperatures of the inlet pipes is larger than or equal to the difference value obtained by subtracting the first preset value from the outer ring temperature, namely [ T In advance of min ]<([T Outer ring ]-a) is not established, the second electronic expansion valve is kept in a closed state.
For better understanding, the first preset value a is set to 9 ℃, the target heat exchanger has three heat exchange pipes, the inlet pipe temperature of each heat exchange pipe is 12 ℃, 11 ℃ and 13 ℃, the outer ring temperature is 21 ℃, and the second electronic expansion valve is opened because the temperature minimum value (i.e. 11) < ambient temperature-a.
In some embodiments, step S602 includes: and if so, opening the second electronic expansion valve based on the preset specified opening degree. That is, the opening degree of the second electronic expansion valve is adjusted to a preset specified opening degree, wherein the preset specified opening degree can be flexibly set according to actual needs, for example, to 10 or the like.
In some embodiments, step S602 includes: if so, determining the opening degree of the second electronic expansion valve based on the minimum value of the inlet pipe temperatures and the outer ring temperature; and opening the second electronic expansion valve based on the determined opening degree of the second electronic expansion valve. Wherein, X Second one ＝w×([T Outer ring ]-A-[T In advance of min ]) W is a predetermined second coefficient, X Second one The opening degree of the second electronic expansion valve. The preset second coefficient can be flexibly set according to actual needs.
In the control method of the heat exchange system provided in this embodiment, the second electronic expansion valve is controlled according to the outer ring temperature and the temperature information, so that the heat exchange medium with a higher temperature in the compressor enters each heat exchange pipeline of the target heat exchanger, and the target heat exchanger is defrosted.
A fourth embodiment of the present invention is proposed based on the third embodiment. In this embodiment, referring to fig. 7, after step S602, the method further includes:
step S70: and monitoring the inlet pipe temperature of each heat exchange pipeline.
In this embodiment, after the second electronic expansion valve is opened, the high-temperature heat exchange medium in the compressor enters each heat exchange pipeline, which may cause the temperature of the heat exchange pipeline to rise, and in order to avoid that the temperature of each heat exchange pipeline is too high to affect heat exchange, in this embodiment, after step S602, the inlet pipe temperature of each heat exchange pipeline is monitored.
Step S80: and when the minimum value of the inlet pipe temperatures of the heat exchange pipes is larger than the difference obtained by subtracting the second preset value from the outer ring temperature, closing the second electronic expansion valve.
The first preset value is greater than the second preset value, and the specific value of the second preset value can be flexibly set according to actual needs, for example, the value range can be 10-12 ℃.
In this embodiment, the pipe inlet temperature of each heat exchange pipe is monitored, and whether the minimum value of the pipe inlet temperatures of the heat exchange pipes is greater than the difference obtained by subtracting the second preset value from the outer ring temperature is judged, if yes, the second electronic expansion valve is closed. That is, at [ T ] For min ]＞([T Outer ring ]-B) when true, closing the second electronic expansion valve, wherein B is a second preset value.
According to the control method of the heat exchange system provided by the embodiment, after the second electronic expansion valve is opened, when certain conditions are met, the second electronic expansion valve is closed, defrosting is completed, and the air conditioning system is enabled to normally operate.
Based on the third embodiment, a fifth embodiment of the heat exchange system control method of the present invention is provided. Referring to fig. 8-1 and 8-2, fig. 8-1 is a structural view of an air conditioning system in which the target heat exchanger 10 is an indoor heat exchanger and the designated heat exchanger 14 is an outdoor heat exchanger, and fig. 8-2 is a structural view of an air conditioning system in which the target heat exchanger 10 is an outdoor heat exchanger and the designated heat exchanger 14 is an indoor heat exchanger.
The outdoor heat exchanger is connected to the C-side of the four-way valve 14, the indoor heat exchanger is connected to the E-side of the four-way valve 14, the exhaust port of the compressor 16 is connected to the D-side of the four-way valve 14, and the suction port of the compressor 16 is connected to the S-side of the four-way valve 14.
The air conditioning system further includes: an indoor temperature sensor 20 disposed indoors for measuring an indoor temperature, and an outdoor temperature sensor 21 disposed outdoors, the outdoor temperature sensor 21 being for measuring an outdoor temperature.
In order to filter impurities and prevent the pipeline of the air conditioning system from being blocked, the air conditioning system may further include: and a filter 22 disposed between the indoor heat exchanger and the outdoor heat exchanger.
In order to prevent the heat exchange medium entering the compressor 16 from containing liquid and causing damage to the compressor 16, the air conditioning system may further include: and a gas-liquid separator 23 disposed between the end of the four-way valve S and the suction end of the compressor 16.
In order to avoid the excessive pressure in the compressor 16, the air conditioning cycle system may further include a pressure sensor 24 disposed at the discharge end of the compressor 16 for monitoring the pressure at the discharge end of the compressor 16 to control the compressor 16 to stop working when the pressure in the compressor 16 is excessive.
For convenient disassembly, the air conditioning cycle system further includes a first valve 25 disposed between the indoor heat exchanger and the outdoor heat exchanger, and a second valve 26 disposed between the indoor heat exchanger and the end of the four-way valve 14E.
The air conditioning cycle system may further include: an indoor fan 27 disposed indoors, and an outdoor fan 28 disposed outdoors. The indoor unit fan 27 is used for sucking indoor air and blowing the indoor air to the indoor heat exchanger, so that the indoor air and the indoor heat exchanger perform heat exchange; the outdoor unit fan 28 is used for drawing outdoor air to blow toward the outdoor heat exchanger, so that the outdoor air exchanges heat with the outdoor heat exchanger.
Based on the foregoing embodiment, a sixth embodiment of the present invention is provided, and this embodiment provides a heat exchange system control device, which is applied to the foregoing heat exchange system. Referring to fig. 9, the control device of the heat exchange system includes:
the obtaining module 90 is configured to obtain temperature information of each heat exchange pipe in target heat exchange in the heat exchange system.
And the control module 91 is used for controlling the opening degree of each electronic expansion valve based on the temperature information.
The heat exchange system control device also optionally comprises corresponding modules so as to realize other steps in the heat exchange system control method.
Based on the heat exchange system control method, the embodiment of the invention also provides heat exchange system control equipment which is applied to the heat exchange system.
The heat exchange system control equipment comprises: the heat exchange system control method comprises at least one processor, a memory and a heat exchange system control program stored on the memory and executable on the processor, wherein the heat exchange system control program is configured to implement the steps of the heat exchange system control method according to any one of the embodiments.
The processor may include one or more processing cores, such as a 4-core processor, an 8-core processor, and so on. The processor may be implemented in at least one hardware form of a DSP (Digital Signal Processing), an FPGA (Field-Programmable Gate Array), and a PLA (Programmable Logic Array). The processor may also include a main processor and a coprocessor, where the main processor is a processor for processing data in an awake state, and is also called a Central Processing Unit (CPU); a coprocessor is a low power processor for processing data in a standby state. In some embodiments, the processor 301 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content required to be displayed on the display screen. The processor may further include an AI (Artificial Intelligence) processor for processing operations related to the heat exchange system control method, so that the heat exchange system control method model may be trained and learned autonomously, improving efficiency and accuracy.
The memory may include one or more computer-readable storage media, which may be non-transitory. The memory may also include high speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In some embodiments, a non-transitory computer readable storage medium in a memory is used to store at least one instruction for execution by a processor to implement a heat exchange system control method provided by method embodiments herein.
Further, based on the foregoing description, an embodiment of the present invention further provides a storage medium, where the storage medium stores a heat exchange system control program, and the heat exchange system control program, when executed by a processor, implements the steps of the heat exchange system control method according to any one of the embodiments. Therefore, a detailed description thereof will be omitted. In addition, the beneficial effects of the same method are not described in detail. For technical details not disclosed in the embodiments of the computer-readable storage medium referred to in the present application, reference is made to the description of the embodiments of the method of the present application. It is determined that, by way of example, the program instructions may be deployed to be executed on one computing device or on multiple computing devices at one site or distributed across multiple sites and interconnected by a communication network.
It will be understood by those skilled in the art that all or part of the processes in the method according to any of the above embodiments may be implemented by a computer program to instruct related hardware, and the heat exchange system control program may be stored in a computer readable storage medium, and when executed, may include the processes according to the embodiments of the methods described below. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only an alternative embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, which are within the spirit of the present invention, are included in the scope of the present invention.
Claims (12)
1. A control method of a heat exchange system is characterized in that the heat exchange system comprises a target heat exchanger, n heat exchange pipelines extending from a first end of the target heat exchanger to a second end of the target heat exchanger are arranged in the target heat exchanger, n is an integer larger than 1, and each heat exchange pipeline is provided with an electronic expansion valve;
the heat exchange system control method comprises the following steps:
acquiring temperature information of each heat exchange pipeline, wherein the temperature information comprises an inlet pipe temperature and an outlet pipe temperature;
controlling the opening degree of each electronic expansion valve based on the temperature information;
the controlling the opening degree of each of the electronic expansion valves based on the temperature information includes:
calculating the absolute value of the difference value between the inlet pipe temperature and the outlet pipe temperature of each heat exchange pipe to obtain a temperature difference absolute value;
controlling the opening degree of each electronic expansion valve according to the absolute value of the temperature difference;
the controlling the opening degree of each electronic expansion valve according to the absolute value of the temperature difference comprises the following steps:
calculating the average value of the absolute values of the temperature differences to obtain the average value of the temperature differences;
adjusting the opening degree of the corresponding electronic expansion valve according to the temperature difference average value and the temperature difference absolute value;
adjusting the opening degree of the corresponding electronic expansion valve according to the temperature difference average value and the temperature difference absolute value, and the method comprises the following steps:
if the absolute value of the temperature difference is larger than the average value of the temperature difference, increasing the opening of the corresponding electronic expansion valve; or the like, or a combination thereof,
and if the absolute value of the temperature difference is smaller than the average value of the temperature difference, reducing the opening of the corresponding electronic expansion valve.
2. The method of claim 1, wherein the adjusting the opening degree of the corresponding electronic expansion valve according to the average temperature difference value and the absolute temperature difference value comprises:
obtaining a target opening value of each electronic expansion valve based on the following formula:
X i ＝X i current +μ×([T Temperature difference i ]-[T Mean temperature difference ])；
Wherein the value range of i is [1, n ]]，X i A target opening value X of the electronic expansion valve corresponding to the ith heat exchange pipeline i current is The current opening value mu of the electronic expansion valve corresponding to the ith heat exchange pipeline is a preset first coefficient, T Temperature difference i The absolute value of the temperature difference, T, corresponding to the ith heat exchange pipeline Mean temperature difference The average value of the temperature difference is taken as the average value;
and controlling the opening degree of the corresponding electronic expansion valve based on each target opening degree value.
3. The method of claim 1, wherein before adjusting the opening of the corresponding electronic expansion valve according to the average temperature difference value and the absolute temperature difference value, the method further comprises:
judging whether the absolute value of the difference value between the absolute value of the temperature difference and the average value of the temperature difference is greater than or equal to a preset threshold value or not;
and if so, adjusting the opening degree of the corresponding electronic expansion valve according to the average temperature difference value and each absolute temperature difference value.
4. The heat exchange system control method according to claim 1, wherein the heat exchange system is an air conditioning system, and the air conditioning system further comprises: a four-way valve connected with the second end of the target heat exchanger, a designated heat exchanger connected with the four-way valve and the first end of the target heat exchanger, a compressor connected with the four-way valve, and a second electronic expansion valve, wherein the exhaust end of the compressor is connected with the first end of the target heat exchanger through the second electronic expansion valve;
after the temperature information of each heat exchange pipeline is obtained, the method further comprises the following steps:
acquiring the temperature of an outer ring;
and controlling the second electronic expansion valve according to the outer ring temperature and the temperature information.
5. The heat exchange system control method of claim 4, wherein the temperature information comprises: the temperature of the inlet pipe;
the controlling the second electronic expansion valve according to the outer ring temperature and each temperature information includes:
judging whether the minimum value of the inlet pipe temperatures is smaller than the difference value obtained by subtracting a first preset value from the outer ring temperature;
if yes, opening the second electronic expansion valve.
6. The heat exchange system control method of claim 5, wherein said opening the second electronic expansion valve comprises:
determining the opening degree of the second electronic expansion valve based on the minimum value of the inlet pipe temperatures and the outer ring temperature;
and opening the second electronic expansion valve based on the opening degree of the second electronic expansion valve.
7. The heat exchange system control method according to claim 5, wherein after opening the second electronic expansion valve, the method further comprises:
monitoring the inlet pipe temperature of each heat exchange pipeline;
when the minimum value of the pipe inlet temperature of each heat exchange pipeline is larger than the difference value obtained by subtracting a second preset value from the outer ring temperature, closing the second electronic expansion valve; the first preset value is greater than the second preset value.
8. The heat exchange system control method of claim 4, wherein the obtaining the outer loop temperature comprises:
if the target heat exchanger is a heat exchanger arranged indoors in the air-conditioning system, acquiring the outer ring temperature when the air-conditioning system is in a refrigeration mode;
or the like, or, alternatively,
and if the target heat exchanger is a heat exchanger arranged outdoors in the air-conditioning system, acquiring the temperature of an outer ring when the air-conditioning system is in a heating mode.
9. The heat exchange system control device is characterized in that the heat exchange system comprises a target heat exchanger, n heat exchange pipelines extending from a first end of the target heat exchanger to a second end of the target heat exchanger are arranged in the target heat exchanger, n is an integer larger than 1, and each heat exchange pipeline is provided with an electronic expansion valve;
the heat exchange system control device comprises:
the acquiring module is used for acquiring temperature information of each heat exchange pipeline, wherein the temperature information comprises an inlet pipe temperature and an outlet pipe temperature;
the adjusting module is used for adjusting the opening degree of each electronic expansion valve based on the temperature information;
the adjustment module is specifically configured to:
calculating the absolute value of the difference value between the pipe inlet temperature and the pipe outlet temperature of each heat exchange pipeline to obtain a temperature difference absolute value;
controlling the opening degree of each electronic expansion valve according to the absolute value of the temperature difference;
the adjustment module is further configured to:
calculating the average value of the absolute values of the temperature differences to obtain the average value of the temperature differences;
adjusting the opening degree of the corresponding electronic expansion valve according to the temperature difference average value and the temperature difference absolute value;
the adjustment module is further configured to:
if the absolute value of the temperature difference is larger than the average value of the temperature difference, increasing the opening of the corresponding electronic expansion valve; or the like, or, alternatively,
and if the absolute value of the temperature difference is smaller than the average value of the temperature difference, reducing the opening of the corresponding electronic expansion valve.
10. A heat exchange system control apparatus, comprising: at least one processor, a memory, and a heat exchange system control program stored on the memory and executable on the processor, the heat exchange system control program configured to implement the steps of the heat exchange system control method of any one of claims 1 to 8.
11. A heat exchange system, comprising: a target heat exchanger and a heat exchange system control device;
n heat exchange pipelines extending from the first end of the target heat exchanger to the second end of the target heat exchanger are arranged in the target heat exchanger, wherein n is an integer larger than 1, and each heat exchange pipeline is provided with an electronic expansion valve;
the heat exchange system control device is used for acquiring the temperature information of each heat exchange pipeline; controlling the opening degree of each electronic expansion valve based on the temperature information, wherein the temperature information comprises an inlet pipe temperature and an outlet pipe temperature;
the heat exchange system control device is specifically used for:
calculating the absolute value of the difference value between the pipe inlet temperature and the pipe outlet temperature of each heat exchange pipeline to obtain a temperature difference absolute value;
controlling the opening degree of each electronic expansion valve according to the absolute value of the temperature difference;
the heat exchange system control device is also used for:
calculating the average value of the absolute values of the temperature differences to obtain the average value of the temperature differences;
adjusting the opening degree of the corresponding electronic expansion valve according to the temperature difference average value and the temperature difference absolute value;
the heat exchange system control device is also used for:
if the absolute value of the temperature difference is larger than the average value of the temperature difference, increasing the opening of the corresponding electronic expansion valve; or the like, or a combination thereof,
and if the absolute value of the temperature difference is smaller than the average value of the temperature difference, reducing the opening of the corresponding electronic expansion valve.
12. A storage medium having stored thereon a heat exchange system control program which, when executed by a processor, implements the steps of the heat exchange system control method according to any one of claims 1 to 8.
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