CN111928410B - Control method for multi-split air conditioning unit - Google Patents
Control method for multi-split air conditioning unit Download PDFInfo
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- CN111928410B CN111928410B CN202010619551.1A CN202010619551A CN111928410B CN 111928410 B CN111928410 B CN 111928410B CN 202010619551 A CN202010619551 A CN 202010619551A CN 111928410 B CN111928410 B CN 111928410B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000004781 supercooling Methods 0.000 claims abstract description 70
- 238000001704 evaporation Methods 0.000 claims description 68
- 230000008020 evaporation Effects 0.000 claims description 49
- 230000006835 compression Effects 0.000 claims description 16
- 238000007906 compression Methods 0.000 claims description 16
- 238000012937 correction Methods 0.000 claims description 8
- 238000005057 refrigeration Methods 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 7
- 239000003507 refrigerant Substances 0.000 abstract description 6
- 230000006872 improvement Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 description 14
- 230000000694 effects Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000013507 mapping Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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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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Abstract
The invention belongs to the technical field of air conditioners, and particularly relates to a control method for a multi-split air conditioner unit. The invention aims to solve the problem that the energy efficiency of the air conditioning unit is difficult to be greatly improved due to the fact that the control mode of the supercooling valve of the traditional multi-split air conditioning unit is not good. Therefore, under the condition of the refrigerating condition of the multi-split air conditioner unit, the control method comprises the following steps: acquiring an outdoor temperature; determining a target superheat degree of the multi-split air conditioning unit according to the outdoor temperature; acquiring the current superheat degree of the multi-split air conditioning unit; and controlling the opening degree and/or the adjusting speed of the supercooling valve according to the current superheat degree and the target superheat degree. According to the invention, the target superheat degree is determined according to the outdoor temperature, and then the opening degree and/or the adjusting speed of the supercooling valve are controlled according to the current superheat degree and the target superheat degree, so that the supercooling valve can better regulate and control the refrigerant conversion condition in the air conditioning unit, thereby improving the heat exchange efficiency of the air conditioning unit to the greatest extent and further achieving the purpose of energy conservation and efficiency improvement.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a control method for a multi-split air conditioner unit.
Background
With the continuous development of air conditioning technology, users put forward higher and higher requirements on the heat exchange efficiency of air conditioning units. For an air conditioning unit, various electric devices capable of adjusting parameters often determine the heat exchange efficiency of the air conditioning unit; particularly, for the multi-split air conditioning unit, the frequency control logic of the variable frequency compressor and the opening control logic of each electronic expansion valve often play a decisive role in the heat exchange efficiency of the whole multi-split air conditioning unit. Taking a multi-split air conditioning unit provided with a supercooling valve as an example, the supercooling valve is additionally arranged originally to improve the heat exchange efficiency of the air conditioning unit; however, the existing multi-split air conditioning unit does not fully utilize the synergistic capacity of the super-cooling valve, so that the energy efficiency improvement range brought by the super-cooling valve to the air conditioning unit is very limited. Specifically, the existing multi-split air conditioning unit is often only when the supercooling valve is needed, the supercooling valve is directly opened to a preset opening, and then the air conditioning unit is operated at the preset opening all the time, namely, the opening of the supercooling valve is not correspondingly regulated in the use process, so that the heat exchange efficiency of the air conditioning unit is difficult to be greatly improved, and the problem of poor user experience is caused.
Accordingly, there is a need in the art for a new control method for a multi-split air conditioning unit to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, in order to solve the problem that the energy efficiency of an air conditioning unit is difficult to be greatly improved due to the fact that the control mode of a supercooling valve of an existing air conditioning unit is poor, the invention provides a control method for a multi-split air conditioning unit, wherein the multi-split air conditioning unit comprises a supercooling valve and a variable frequency compressor, and under the condition that the multi-split air conditioning unit operates under refrigeration conditions, the control method comprises the following steps: acquiring an outdoor temperature; determining a target superheat degree of the multi-split air conditioning unit according to the outdoor temperature; acquiring the current superheat degree of the multi-split air conditioning unit; and controlling the opening degree and/or the adjusting speed of the supercooling valve according to the current superheat degree and the determined target superheat degree.
In the above preferred technical solution of the control method for a multi-split air conditioning unit, the step of controlling the opening degree and/or the adjusting speed of the supercooling valve according to the current superheat degree and the determined target superheat degree includes: if the target superheat degree is larger than the current superheat degree, increasing the opening degree of the supercooling valve; and/or if the target superheat degree is smaller than the current superheat degree, reducing the opening degree of the supercooling valve.
In the above preferred technical solution of the control method for a multi-split air conditioning unit, the step of controlling the opening degree and/or the adjusting speed of the supercooling valve according to the current superheat degree and the determined target superheat degree further includes: determining the increasing speed of the supercooling valve according to the difference value between the target superheat degree and the current superheat degree under the condition that the target superheat degree is larger than the current superheat degree; and/or determining the reduction speed of the supercooling valve according to the difference value between the current superheat degree and the target superheat degree under the condition that the target superheat degree is smaller than the current superheat degree.
In the above preferred technical solution of the control method for a multi-split air conditioner unit, the step of determining the target superheat degree of the multi-split air conditioner unit according to the outdoor temperature includes: when the outdoor temperature is greater than or equal to a first preset outdoor temperature and less than or equal to a second preset outdoor temperature, the target superheat degree is greater than or equal to the first preset superheat degree and less than or equal to the second preset superheat degree, and the target superheat degree is linearly related to the outdoor temperature.
In the above preferred technical solution of the control method for a multi-split air conditioner unit, the step of determining the target superheat degree of the multi-split air conditioner unit according to the outdoor temperature further includes: and when the outdoor temperature is higher than the second preset outdoor temperature, the target superheat degree is equal to the second preset superheat degree.
In the above preferred technical solution of the control method for a multi-split air conditioning unit, before executing the "controlling the opening degree and/or the adjusting speed of the supercooling valve according to the current superheat degree and the determined target superheat degree", the control method further includes: controlling the subcooling valve to open if at least one of the following conditions is met: the duration of the current operation refrigeration working condition of the multi-split air conditioning unit reaches a first preset duration; the outdoor temperature is greater than or equal to a third preset outdoor temperature; the difference between the exhaust temperature of the variable frequency compressor and the saturation temperature corresponding to the high-pressure of the multi-split air conditioning unit is larger than or equal to a first preset temperature difference; the low pressure of the multi-split air conditioning unit is larger than or equal to a first preset low pressure and smaller than or equal to a second preset low pressure; the compression ratio of the variable frequency compressor is greater than or equal to a first preset compression ratio.
In the above preferred technical solution of the control method for a multi-split air conditioner unit, after executing the "controlling the opening degree and/or the adjusting speed of the supercooling valve according to the current superheat degree and the determined target superheat degree", the control method further includes: controlling the subcooling valve to close if at least one of the following conditions is met: the variable frequency compressor stops running; the duration time that the outdoor temperature is less than or equal to the fourth preset outdoor temperature reaches the second preset duration time; the difference between the exhaust temperature of the variable frequency compressor and the saturation temperature corresponding to the high-pressure of the multi-split air conditioning unit is smaller than or equal to the duration of the second preset temperature difference to reach a third preset duration; the duration time that the low pressure of the multi-split air conditioning unit is smaller than the third preset low pressure reaches a fourth preset duration time; the duration time that the low pressure of the multi-split air conditioning unit is larger than the fourth preset low pressure reaches a fifth preset duration time; the duration time that the compression ratio of the variable frequency compressor is smaller than the second preset compression ratio reaches a sixth preset duration time; wherein the third preset low pressure is less than the fourth preset low pressure.
In the above preferred technical solution of the control method for a multi-split air conditioner unit, when or after executing the "controlling the opening degree and/or the adjusting speed of the supercooling valve according to the current superheat degree and the determined target superheat degree", the control method further includes: acquiring the nominal capacity of all indoor units in an operation state; calculating the sum of the nominal capacities of all the indoor units in the running state; calculating the ratio of the sum of the nominal capacities of all the indoor units in the running state to the sum of the nominal capacities of all the indoor units; determining a target evaporation temperature according to the ratio, the outdoor temperature and the current operation mode of the multi-split air conditioning unit; and adjusting the operating frequency of the variable frequency compressor according to the determined target evaporating temperature.
In the above preferred technical solution of the control method for a multi-split air conditioning unit, the target evaporation temperature is determined by the following formula: et=a+k μ, where ET is the target evaporation temperature, a is determined according to the outdoor temperature and the current operation mode of the multi-split air conditioning unit, k is a correction coefficient, and μ is the ratio.
In the above preferred technical solution of the control method for the multi-split air conditioning unit, the correction coefficient k is 1.28.
As can be appreciated by those skilled in the art, in the technical scheme of the present invention, the multi-split air conditioning unit of the present invention includes a super-cooling valve and a variable frequency compressor, and the control method for the multi-split air conditioning unit of the present invention includes: acquiring an outdoor temperature; determining a target superheat degree of the multi-split air conditioning unit according to the outdoor temperature; acquiring the current superheat degree of the multi-split air conditioning unit; and controlling the opening degree and/or the adjusting speed of the supercooling valve according to the current superheat degree and the determined target superheat degree. According to the invention, the target superheat degree of the multi-split air conditioning unit is determined through the outdoor temperature, and then the opening degree and/or the adjusting speed of the supercooling valve are controlled according to the current superheat degree and the target superheat degree, so that the supercooling valve can better regulate and control the conversion condition of the refrigerant, thereby improving the heat exchange efficiency of the multi-split air conditioning unit to the greatest extent, and further achieving the purpose of energy saving and efficiency improvement.
Drawings
Fig. 1 is a schematic view of the structure of an outdoor part of an air conditioning unit according to the present invention;
FIG. 2 is a flow chart of the main steps of the control method of the present invention;
fig. 3 is a flow chart of the steps of a preferred embodiment of the control method of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention. Those skilled in the art can adapt it as desired to suit a particular application. Meanwhile, although the steps of the method of the present invention are described in a specific order in the present application, the order is not limiting, and one skilled in the art may perform the steps in a different order without departing from the basic principle of the present invention.
It should be noted that, in the description of the present embodiment, terms such as "upper", "lower", "left", "right", and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, and thus are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation or must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring first to fig. 1, a schematic view of an outdoor portion of an air conditioning unit according to the present invention is shown. In order to clearly show the electrical device of the outdoor part, fig. 1 only shows the structure of the outdoor part, the outdoor part is connected with the indoor part through the liquid pipe stop valve and the air pipe stop valve, and a technician can set the specific structure of the indoor part according to the actual use requirement, for example, the number of indoor units and the like. As shown in fig. 1, the multi-split air conditioning unit of the present invention includes an outdoor heat exchanger 11, a variable frequency compressor 12, a gas-liquid separator 13, a four-way valve 14, an economizer 15, and a supercooling valve 16, and an electronic expansion valve 17 and a filter 18 are further disposed between the outdoor heat exchanger 11 and the economizer 15, wherein the outdoor heat exchanger 11, the variable frequency compressor 12, the gas-liquid separator 13, the four-way valve 14, and the economizer 15 are connected through a main refrigerant pipeline, and the main refrigerant pipeline is further connected with an indoor portion through a liquid pipe stop valve and a gas pipe stop valve, so as to achieve refrigerant circulation, thereby achieving a heat exchange effect; the left end of the supercooling valve 16 is connected with the economizer 15, the right end of the supercooling valve 16 is connected between the economizer 15 and the electronic expansion valve 17, and the supercooling valve 16 can achieve the effects of supplementing air and increasing enthalpy, so that the heat exchange efficiency of the multi-split air conditioning unit is effectively improved. It should be noted that, the present invention does not limit the specific structure of the multi-split air conditioning unit, and those skilled in the art can set the multi-split air conditioning unit according to the actual use requirement, as long as the multi-split air conditioning unit is provided with the supercooling valve 16.
Further, the multi-split air conditioning unit further includes a controller, in which various standard data, for example, nominal capacity of each indoor unit, etc., are stored, and the controller is also capable of acquiring detection data of each sensor, for example, acquiring outdoor temperature through an outdoor temperature sensor, etc. In addition, the controller can also control the running state of the multi-split air conditioner unit, for example, control the running frequency of the variable frequency compressor and the like. It can be understood by those skilled in the art that the present invention does not limit the specific structure and model of the controller, and the controller may be an original controller of the multi-split air conditioning unit, or may be a controller separately provided for executing the control method of the present invention, and the skilled person may set the specific structure and model of the controller according to the actual use requirement.
Referring next to fig. 2, a flow chart of main steps of the control method of the present invention is shown. As shown in fig. 2, based on the multi-split air conditioning unit described in the above embodiment, when the multi-split air conditioning unit operates under a refrigeration condition, the control method of the present invention mainly includes the following steps:
s1: acquiring an outdoor temperature;
s2: determining a target superheat degree of the multi-split air conditioning unit according to the outdoor temperature;
s3: acquiring the current superheat degree of the multi-split air conditioning unit;
s4: and controlling the opening degree and/or the adjusting speed of the supercooling valve according to the current superheat degree and the determined target superheat degree.
It should be noted that, the present invention does not limit the specific way of acquiring the outdoor temperature by the controller, the controller may not only acquire the outdoor temperature by means of the temperature sensor set by the multi-split air conditioning unit, but also acquire the outdoor temperature by means of networking, and the specific acquisition way is not limited, and the technical personnel may set the device according to the actual use situation.
After the outdoor temperature is obtained, the controller can determine the target superheat degree of the multi-split air conditioning unit according to the outdoor temperature; it should be noted that the present invention does not limit the specific determination mode, and the technician can set the specific determination mode according to the actual use requirement, so long as the unique target superheat degree can be determined according to the outdoor temperature; for example, it may be determined according to the mapping relation.
Next, in step S103, the controller may obtain the current superheat degree of the multi-split air conditioning unit, and in this preferred embodiment, the current superheat degree of the multi-split air conditioning unit refers to the difference between the temperature at the inlet and the temperature at the outlet of the outdoor heat exchanger 11, which is not limited, and the skilled person may set the algorithm of the current superheat degree according to the need, as long as the current superheat degree can reflect the refrigerant state. In addition, it should be noted that, the execution timing of step S103 may be changed, as long as the step of obtaining the current superheat degree of the multi-split air conditioning unit is performed before step S104, for example, step S104 may also be performed between step S101 and step S102, and this change of the specific execution sequence does not deviate from the basic principle of the present invention, which falls within the scope of protection of the present invention.
Finally, in step S104, the controller controls the opening degree and/or the adjusting speed of the supercooling valve according to the current superheat degree and the target superheat degree, so that the opening degree of the supercooling valve can be adapted to the running state of the multi-split air conditioning unit all the time, and further, the heat exchange efficiency of the multi-split air conditioning unit is improved to the greatest extent.
It should be noted that, the present invention does not limit the specific control manner of controlling the opening and/or the adjustment speed of the subcooling valve according to the current superheat degree and the target superheat degree, and a technician may determine the specific control manner according to the actual use requirement, for example, the technician may determine the unique opening and/or adjustment speed by setting a certain mapping relationship so as to substitute the current superheat degree and the target superheat degree into the mapping relationship, and then perform corresponding control according to the determined value. It will be appreciated by those skilled in the art that the control method may control only the opening of the supercooling valve, may control only the adjustment speed of the supercooling valve, and may control both the opening and the adjustment speed of the supercooling valve.
Reference is now made to fig. 3, which is a flow chart of the steps of a preferred embodiment of the control method of the present invention. As shown in fig. 3, when the multi-split air conditioning unit operates under a refrigeration condition, a preferred embodiment of the control method of the present invention specifically includes the following steps:
s101: acquiring an outdoor temperature;
s102: determining a target superheat degree of the multi-split air conditioning unit according to the outdoor temperature;
s103: acquiring the current superheat degree of the multi-split air conditioning unit;
s104: if the target superheat degree is larger than the current superheat degree, increasing the opening degree of the supercooling valve;
s105: determining the increasing speed of the supercooling valve according to the difference value between the target superheat degree and the current superheat degree;
s106: if the target superheat degree is smaller than the current superheat degree, reducing the opening degree of the supercooling valve;
s107: determining the reduction speed of the supercooling valve according to the difference value between the current superheat degree and the target superheat degree;
s108: acquiring the nominal capacity of all indoor units in an operation state;
s109: calculating the sum of the nominal capacities of all the indoor units in the running state;
s110: calculating the ratio of the sum of the nominal capacities of all the indoor units in the running state to the sum of the nominal capacities of all the indoor units;
s111: determining a target evaporation temperature according to the ratio, the outdoor temperature and the current operation mode of the multi-split air conditioning unit;
s112: and adjusting the operating frequency of the variable frequency compressor according to the determined target evaporating temperature.
Before executing this preferred embodiment, the controller is further required to selectively open the supercooling valve according to the opening condition of the supercooling valve, that is, the preferred embodiment is executed in a case where the supercooling valve has been opened.
As a preferred embodiment, the controller controls the supercooling valve to open only when the following five conditions are simultaneously satisfied:
condition 1: and the duration of the current operation refrigeration working condition of the multi-split air conditioning unit reaches a first preset duration.
In other words, the controller can judge whether the supercooling valve needs to be opened or not under the condition that the multi-split air conditioning unit is stably operated. A technician can set a specific value of the first preset duration according to actual use requirements, and the multi-split air conditioning unit is in a stable running state only when the current running duration of the multi-split air conditioning unit reaches the first preset duration; preferably, the first preset time period is 10 minutes.
Condition 2: the outdoor temperature is greater than or equal to a third preset outdoor temperature.
It should be noted that, a person skilled in the art may set the specific value of the third preset outdoor temperature according to the actual use requirement; preferably, the third preset outdoor temperature is 20 ℃.
Condition 3: and the difference between the exhaust temperature of the variable frequency compressor and the saturation temperature corresponding to the high-pressure of the multi-split air conditioning unit is larger than or equal to a first preset temperature difference.
It should be noted that, a person skilled in the art may set the value of the first preset temperature difference according to the actual use requirement; preferably, the first preset temperature difference is 30 ℃.
Condition 4: the low pressure of the multi-split air conditioning unit is larger than or equal to a first preset low pressure and smaller than or equal to a second preset low pressure.
It should be noted that, a person skilled in the art may set specific values of the first preset low pressure and the second preset low pressure according to actual use requirements; preferably, the first preset low pressure is 0.35MPa and the second preset low pressure is 1.35MPa.
Condition 5: and if the compression ratio of the variable frequency compressor is larger than or equal to a first preset compression ratio, controlling the supercooling valve to be opened.
It should be noted that, a person skilled in the art may set the specific value of the first preset compression ratio according to the actual use requirement; preferably, the first preset compression ratio is 2.5.
It will be appreciated by those skilled in the art that although the opening timing described in the present preferred embodiment is such that the above five opening conditions are satisfied simultaneously; however, it is obvious to the skilled person that the opening timing may be set to meet the above partial conditions, and that this specific setting may be changed without departing from the basic principle of the present invention, and it is within the scope of the present invention.
In addition, it should be noted that, generally, after the opening condition is met, the controller directly adjusts the opening of the subcooling valve to the preset initial opening first, and then selectively adjusts the opening according to the situation, so as to effectively ensure the effect of air-supplementing and enthalpy-increasing. Preferably, the preset initial opening is 32pls.
In the case where the controller has controlled the supercooling valve to be opened, step S101 is performed, i.e., the controller acquires an outdoor temperature. It should be noted that, the present invention does not limit the specific way of acquiring the outdoor temperature by the controller, the controller may not only acquire the outdoor temperature by means of the temperature sensor set by the multi-split air conditioning unit, but also acquire the outdoor temperature by means of networking, and the specific acquisition way is not limited, and the technical personnel may set the device according to the actual use situation.
After the outdoor temperature is obtained, step S102 is executed, that is, the controller determines the target superheat degree of the multi-split air conditioning unit according to the outdoor temperature.
As a preferred embodiment, when the outdoor temperature is a first preset outdoor temperature, the target superheat degree is set to a first preset superheat degree; when the outdoor temperature is a second preset outdoor temperature, the target superheat degree is set to be the second preset superheat degree; the first preset outdoor temperature is smaller than the second preset outdoor temperature, and the first preset superheat degree is smaller than the second preset superheat degree. When the outdoor temperature is between the first preset outdoor temperature and the second preset outdoor temperature, the target superheat degree is also set between the first preset superheat degree and the second preset superheat degree, and the target superheat degree and the outdoor temperature are linearly related in the range, that is, a unique relational expression can be determined through two endpoints, and in this case, a unique target superheat degree can be determined through the unique outdoor temperature. In addition, when the outdoor temperature is greater than the second preset outdoor temperature, the target superheat degree is set to be equal to the second preset superheat degree, so that the heat exchange effect and the heat exchange efficiency of the multi-split air conditioning unit are simultaneously considered.
Preferably, the first preset outdoor temperature is 20 ℃, the second preset outdoor temperature is 35 ℃, the first preset superheat degree is 5 ℃, the second preset superheat degree is 20 ℃, and the determined slope is 1, that is, when the outdoor temperature is between 20 ℃ and 35 ℃, the target superheat degree is increased by 1 ℃ every 1 ℃ when the outdoor temperature is increased.
After determining the target superheat degree and acquiring the current superheat degree, the controller can control the opening degree and the adjusting speed of the supercooling valve according to the current superheat degree and the target superheat degree. In the preferred embodiment, the specific control manner is as follows:
and under the condition that the target superheat degree is larger than the current superheat degree, the controller controls the opening degree of the supercooling valve to be increased, and determines the increasing speed of the supercooling valve according to the difference value between the target superheat degree and the current superheat degree, wherein the larger the difference value is, the smaller the corresponding increasing speed is, so that the adjusting efficiency is effectively improved, and the problem of repeated adjustment is avoided.
And under the condition that the target superheat degree is smaller than the current superheat degree, the controller controls the opening degree of the supercooling valve to be reduced, and determines the reduction speed of the supercooling valve according to the difference value between the current superheat degree and the target superheat degree, and the larger the difference value is, the smaller the corresponding reduction speed is, so that the adjustment efficiency is effectively improved, and the problem of repeated adjustment is avoided.
Further, as a preferred embodiment, the controller controls the supercooling valve to close in the process of adjusting the supercooling valve, or after the supercooling valve has been adjusted, in the case where any one of the following six conditions is satisfied:
condition 1: and stopping the operation of the variable frequency compressor.
Condition 2: the duration of the outdoor temperature being less than or equal to the fourth preset outdoor temperature reaches the second preset duration.
It should be noted that, a person skilled in the art may set specific values of the fourth preset outdoor temperature and the second preset time period according to actual use requirements; preferably, the fourth preset outdoor temperature is 18 ℃, and the second preset time period is 1 minute.
Condition 3: and the duration time of the difference between the exhaust temperature of the variable frequency compressor and the saturation temperature corresponding to the high-pressure of the multi-split air conditioning unit is less than or equal to the second preset temperature difference and reaches a third preset duration time.
It should be noted that, a person skilled in the art may set the specific values of the second preset temperature difference and the third preset time period according to the actual use requirement; preferably, the second preset temperature difference is 20 ℃, and the third preset time period is 1 minute.
Condition 4: and the duration time that the low pressure of the multi-split air conditioning unit is smaller than the third preset low pressure reaches the fourth preset duration time.
It should be noted that, a person skilled in the art may set specific values of the third preset low pressure and the fourth preset duration according to actual use requirements; preferably, the third preset low pressure is 0.3MPa and the fourth preset time period is 1 minute.
Condition 5: and the duration time that the low pressure of the multi-split air conditioning unit is larger than the fourth preset low pressure reaches a fifth preset duration time.
It should be noted that, a person skilled in the art may set specific values of the fourth preset low pressure and the fifth preset duration according to actual use requirements; preferably, the fourth preset low pressure is 1.4MPa and the fifth preset time period is 1 minute.
Condition 6: the duration that the compression ratio of the variable frequency compressor is smaller than the second preset compression ratio reaches a sixth preset duration.
It should be noted that, a person skilled in the art may set the specific values of the second preset compression ratio and the sixth preset duration according to the actual use requirement; preferably, the second preset compression ratio is 2, and the sixth preset duration is 1 minute.
It will be appreciated by those skilled in the art that although the closing timing described in the preferred embodiment is any one of the six closing conditions above; however, it is obvious to the skilled person that the closing timing may be set to meet the above conditions, and that this specific setting may be changed without departing from the basic principle of the present invention, and it is within the scope of the present invention.
After the opening degree of the super-cooling valve is adjusted, the overall operation condition of the multi-split air conditioner unit is changed, and in the situation, the controller can also adjust the frequency of the variable frequency compressor so as to better adapt to the change of the unit and improve the heat exchange efficiency of the unit to the greatest extent.
As a preferred embodiment, the specific adjustment mode for the frequency of the inverter compressor is as follows:
in step S108, the controller can obtain the nominal capacities of all the indoor units in the operation state, where the indoor units in the operation state are the indoor units that are performing heat exchange. It should be noted that the present invention does not limit the initial operating frequency of the inverter compressor, and a technician can set the inverter compressor according to the actual use requirement, i.e. when the indoor unit is turned on, the inverter compressor is operated at the initial operating frequency. Next, step S109 is executed, where the controller calculates the sum of the nominal capacities of all the indoor units in the running state; of course, this calculation process may be performed by the controller, or may be performed by another device, and then obtained by the controller. Similarly, the calculation process in step S110 may be performed by the controller, or may be performed by other devices, and then acquired by the controller.
And then, the controller determines a target evaporation temperature according to the ratio (namely the starting load rate of the multi-split air conditioner unit), the outdoor temperature and the current operation mode of the multi-split air conditioner unit. In the preferred embodiment, when the multi-split air conditioning unit operates under the refrigeration working condition, two operation modes can be selected, one is an effect mode (namely a conventional refrigeration mode) and the other is an energy-saving mode; of course, this is not limiting and the skilled person may adjust itself to different unit types.
The step of determining the target evaporation temperature according to the ratio, the outdoor temperature and the current operation mode of the multi-split air conditioning unit specifically comprises determining the target evaporation temperature ET by the following formula:
ET＝a+k*μ
and determining a value of a according to the outdoor temperature and the current operation mode of the multi-split air conditioner unit, wherein k is a correction coefficient, and mu is the ratio (namely the starting load rate of the multi-split air conditioner unit).
It should be noted that, generally, the correction coefficient k is a constant, and a person skilled in the art can set the value of the correction coefficient according to the type of the unit; preferably, the correction coefficient is set to 1.28.
As a preferred embodiment, the manner of determining the value of a according to the outdoor temperature and the current operation mode of the multi-split air conditioner set is as follows:
| outdoor temperature TAO | In effect mode, the value of a | In the energy saving mode, the value of a |
| TAO≤5℃ | ﹣1℃ | 2℃ |
| 5℃＜TAO≤25℃ | 0℃ | 3℃ |
| 25℃＜TAO＜43℃ | 2℃ | 4℃ |
| TAO≥43℃ | 5℃ | 5℃ |
It should be noted that, the determination of the value of a through the above table is only a preferred embodiment, and those skilled in the art can also adjust the specific setting mode according to the actual use requirement.
And under the condition that the target evaporation temperature is determined, the controller adjusts the operating frequency of the variable frequency compressor according to the determined target evaporation temperature.
Specifically, the unique target evaporation pressure can be determined according to the determined target evaporation temperature, the current evaporation pressure of the multi-split air conditioner unit is obtained, and the frequency adjusting mode of the variable frequency compressor can be determined according to the current evaporation pressure and the determined target evaporation pressure.
If the current evaporation pressure is larger than the target evaporation pressure, controlling the variable frequency compressor to increase the frequency; if the current evaporation pressure is smaller than the target evaporation pressure, controlling the variable frequency compressor to reduce the frequency; the specific adjustment speed can be determined by the difference between the current evaporation pressure and the target evaporation pressure.
Therefore, the control method can be divided into two control logics of supercooling valve control and variable frequency compressor control, and the two control logics can be repeatedly and alternately executed in the process of running the refrigerating working condition of the multi-split air conditioning unit until the whole multi-split air conditioning unit can stably and efficiently run.
Taking a multi-split air conditioner set with 10HP outdoor units matched with 4 indoor units with 2.5HP as an example, when the air conditioner set operates in an effect mode and the outdoor temperature is 35 ℃, the value of a at the moment is 2 ℃ according to the table. In this case, the adjustment modes of the inverter compressor are divided into the following four cases:
case 1 (4 indoor units are fully on and the current evaporation pressure is greater than the target evaporation pressure): the ratio of the sum of the nominal capacities of the indoor units in the running state to the sum of the nominal capacities of all the indoor units, namely, the starting load rate is (2.5+2.5+2.5+2.5)/(2.5+2.5+2.5+2.5) ×100% = 100%, the target evaporation temperature et=2+1.28×100% = 3.28 ℃, the target evaporation pressure corresponding to the target evaporation temperature is 7.9bar when the target evaporation temperature is 3.28 ℃, and if the current evaporation pressure at the moment is 8.5bar (i.e. the current evaporation pressure is greater than the target evaporation pressure), the controller controls the variable frequency compressor to perform frequency boosting until the current evaporation pressure reaches the target evaporation pressure or the frequency of the variable frequency compressor has risen to the highest value.
Case 2 (2 indoor units are turned on and the current evaporation pressure is greater than the target evaporation pressure): the ratio of the sum of the nominal capacities of the indoor units in the running state to the sum of the nominal capacities of all the indoor units, namely, the starting load rate is (2.5+2.5)/(2.5+2.5+2.5+2.5) ×100% = 50%, the target evaporating temperature et=2+1.28×50% = 2.64 ℃, the target evaporating pressure corresponding to the target evaporating temperature is 7.73bar, and if the current evaporating pressure at the moment is 8.5bar (i.e. the current evaporating pressure is greater than the target evaporating pressure), the controller controls the variable frequency compressor to perform frequency boosting until the current evaporating pressure reaches the target evaporating pressure or the frequency of the variable frequency compressor has risen to the highest value.
Case 3 (4 indoor units are fully on and the current evaporation pressure is less than the target evaporation pressure): the ratio of the sum of the nominal capacities of the indoor units in the running state to the sum of the nominal capacities of all the indoor units, namely, the starting load rate is (2.5+2.5+2.5+2.5)/(2.5+2.5+2.5+2.5) ×100% = 100%, the target evaporation temperature et=2+1.28×100% = 3.28 ℃, the target evaporation pressure corresponding to the target evaporation temperature is 7.9bar when the target evaporation temperature is 3.28 ℃, and if the current evaporation pressure at the moment is 6.5bar (i.e. the current evaporation pressure is smaller than the target evaporation pressure), the controller controls the inverter compressor to perform the frequency reduction until the current evaporation pressure reaches the target evaporation pressure or the frequency of the inverter compressor is increased to the minimum value.
Case 4 (2 indoor units are turned on and the current evaporation pressure is greater than the target evaporation pressure): the ratio of the sum of the nominal capacities of the indoor units in the running state to the sum of the nominal capacities of all the indoor units, namely, the starting load rate is (2.5+2.5)/(2.5+2.5+2.5+2.5) ×100% = 50%, the target evaporating temperature et=2+1.28×50% = 2.64 ℃, the target evaporating pressure corresponding to the target evaporating temperature is 7.73bar, and if the current evaporating pressure at the moment is 6.5bar (i.e. the current evaporating pressure is smaller than the target evaporating pressure), the controller controls the variable frequency compressor to perform frequency reduction until the current evaporating pressure reaches the target evaporating pressure or the frequency of the variable frequency compressor is increased to the minimum value.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features can be made by those skilled in the art without departing from the basic principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.
Claims (4)
1. The control method for the multi-split air conditioning unit is characterized by comprising a supercooling valve and a variable frequency compressor, and comprises the following steps of:
acquiring an outdoor temperature;
determining a target superheat degree of the multi-split air conditioning unit according to the outdoor temperature;
acquiring the current superheat degree of the multi-split air conditioning unit;
controlling the opening degree and/or the adjusting speed of the supercooling valve according to the current superheat degree and the determined target superheat degree;
before executing the control of the opening degree and/or the adjustment speed of the supercooling valve according to the current superheat degree and the determined target superheat degree, the control method further includes: controlling the subcooling valve to open if the following five conditions are simultaneously met:
the duration of the current operation refrigeration working condition of the multi-split air conditioning unit reaches a first preset duration;
the outdoor temperature is greater than or equal to a third preset outdoor temperature;
the difference between the exhaust temperature of the variable frequency compressor and the saturation temperature corresponding to the high-pressure of the multi-split air conditioning unit is larger than or equal to a first preset temperature difference;
the low pressure of the multi-split air conditioning unit is larger than or equal to a first preset low pressure and smaller than or equal to a second preset low pressure;
the compression ratio of the variable frequency compressor is larger than or equal to a first preset compression ratio;
after executing the control of the opening degree and/or the adjustment speed of the supercooling valve according to the current superheat degree and the determined target superheat degree, the control method further includes: controlling the subcooling valve to close if at least one of the following conditions is met:
the variable frequency compressor stops running;
the duration time that the outdoor temperature is less than or equal to the fourth preset outdoor temperature reaches the second preset duration time;
the difference between the exhaust temperature of the variable frequency compressor and the saturation temperature corresponding to the high-pressure of the multi-split air conditioning unit is smaller than or equal to the duration of the second preset temperature difference to reach a third preset duration;
the duration time that the low pressure of the multi-split air conditioning unit is smaller than the third preset low pressure reaches a fourth preset duration time;
the duration time that the low pressure of the multi-split air conditioning unit is larger than the fourth preset low pressure reaches a fifth preset duration time;
the duration time that the compression ratio of the variable frequency compressor is smaller than the second preset compression ratio reaches a sixth preset duration time;
wherein the third preset low pressure is less than the fourth preset low pressure;
the step of controlling the opening degree and/or the adjusting speed of the supercooling valve according to the current superheat degree and the determined target superheat degree comprises the following steps:
if the target superheat degree is larger than the current superheat degree, increasing the opening degree of the supercooling valve; and/or
If the target superheat degree is smaller than the current superheat degree, reducing the opening degree of the supercooling valve;
the step of controlling the opening degree and/or the adjusting speed of the supercooling valve according to the current superheat degree and the determined target superheat degree further comprises:
determining the increasing speed of the supercooling valve according to the difference value between the target superheat degree and the current superheat degree under the condition that the target superheat degree is larger than the current superheat degree; and/or
Determining the reduction speed of the supercooling valve according to the difference value between the current superheat degree and the target superheat degree under the condition that the target superheat degree is smaller than the current superheat degree;
the step of determining the target superheat degree of the multi-split air conditioner unit according to the outdoor temperature comprises the following steps:
when the outdoor temperature is greater than or equal to a first preset outdoor temperature and less than or equal to a second preset outdoor temperature, the target superheat degree is greater than or equal to the first preset superheat degree and less than or equal to the second preset superheat degree, and the target superheat degree is linearly related to the outdoor temperature;
the step of determining the target superheat degree of the multi-split air conditioner unit according to the outdoor temperature further comprises the following steps:
and when the outdoor temperature is higher than the second preset outdoor temperature, the target superheat degree is equal to the second preset superheat degree.
2. The control method according to claim 1, characterized in that, while or after performing "controlling the opening degree and/or the adjustment speed of the supercooling valve in accordance with the current degree of superheat and the determined target degree of superheat", the control method further comprises:
acquiring the nominal capacity of all indoor units in an operation state;
calculating the sum of the nominal capacities of all the indoor units in the running state;
calculating the ratio of the sum of the nominal capacities of all the indoor units in the running state to the sum of the nominal capacities of all the indoor units;
determining a target evaporation temperature according to the ratio, the outdoor temperature and the current operation mode of the multi-split air conditioning unit;
and adjusting the operating frequency of the variable frequency compressor according to the determined target evaporating temperature.
3. The control method according to claim 2, characterized in that the target evaporation temperature is determined by:
ET=a＋k*µ
and the ET is the target evaporation temperature, the value of a is determined according to the outdoor temperature and the current running mode of the multi-split air conditioning unit, k is a correction coefficient, and mu is the ratio.
4. A control method according to claim 3, wherein the correction coefficient k is 1.28.
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| CN114322249A (en) * | 2021-12-17 | 2022-04-12 | 宁波奥克斯电气股份有限公司 | Exhaust pressure adjusting method and device of air conditioner and air conditioner |
| CN117128581B (en) * | 2023-07-27 | 2024-06-07 | 浙江国祥股份有限公司 | Evaporation condensation variable frequency magnetic suspension multi-connected unit |
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