CN111928410A - Control method for multi-split air conditioning unit - Google Patents
Control method for multi-split air conditioning unit Download PDFInfo
- Publication number
- CN111928410A CN111928410A CN202010619551.1A CN202010619551A CN111928410A CN 111928410 A CN111928410 A CN 111928410A CN 202010619551 A CN202010619551 A CN 202010619551A CN 111928410 A CN111928410 A CN 111928410A
- Authority
- CN
- China
- Prior art keywords
- air conditioning
- superheat degree
- conditioning unit
- preset
- split air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
-
- 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
Abstract
The invention belongs to the technical field of air conditioners, and particularly relates to a control method for a multi-split air conditioning unit. The invention aims to solve the problem that the energy efficiency of an air conditioning unit is difficult to greatly improve due to the poor control mode of the existing multi-split air conditioning unit on the supercooling valve. Therefore, under the condition that the multi-split air conditioning unit operates under the refrigeration working condition, the control method comprises the following steps: acquiring 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. The invention firstly determines the target superheat degree according to the outdoor temperature, and then 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 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 maximum extent and further achieving the purposes 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 conditioning unit.
Background
With the continuous development of air conditioning technology, users have made 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 an supercooling valve as an example, the addition of the supercooling valve is originally for improving the heat exchange efficiency of the air conditioning unit; however, the efficiency increasing capability of the supercooling valve is not fully utilized in the existing multi-split air conditioning unit, so that the energy efficiency increasing range brought to the air conditioning unit by the supercooling valve is very limited. Specifically, current many online air conditioning unit is often only when needing to use the supercooling valve, directly opens the supercooling valve to predetermineeing the aperture, then just in order to predetermineeing the aperture operation all the time, does not carry out corresponding regulation to the aperture of supercooling valve in the use promptly to the heat exchange efficiency that leads to air conditioning unit is difficult to obtain promoting by a wide margin, and then leads to the not good problem of user experience.
Accordingly, there is a need in the art for a new control method for a multi-split air conditioning unit to solve the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the energy efficiency of an air conditioning unit is difficult to be greatly improved due to the poor control method of the existing air conditioning unit on the subcooling valve, the present invention provides a control method for a multi-split air conditioning unit, where the multi-split air conditioning unit includes a subcooling valve and an inverter compressor, and under the condition of an operation refrigeration condition of the multi-split air conditioning unit, the control method includes: acquiring 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 and/or the adjusting speed of the supercooling valve according to the current superheat degree and the determined target superheat degree.
In a preferred embodiment of the control method for the multi-split air conditioning unit, the step of controlling the opening 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 decreasing the opening degree of the supercooling valve if the target superheat degree is less than the current superheat degree.
In a preferred embodiment of the control method for the multi-split air conditioning unit, the step of controlling the opening and/or the adjusting speed of the supercooling valve according to the current superheat degree and the determined target superheat degree further includes: under the condition that the target superheat degree is larger than the current superheat degree, determining the increasing speed of the supercooling valve according to the difference value of the target superheat degree and the current superheat degree; and/or determining the reducing speed of the supercooling valve according to the difference value of 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 a preferred embodiment of the control method for the multi-split air conditioning unit, the step of determining the target superheat degree of the multi-split air conditioning 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 a first preset superheat degree and less than or equal to a second preset superheat degree, and the target superheat degree and the outdoor temperature are in linear correlation.
In a preferred embodiment of the control method for the multi-split air conditioning unit, the step of determining the target superheat degree of the multi-split air conditioning 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 a preferred embodiment of the control method for the multi-split air conditioning unit, before "controlling the opening degree and/or the adjustment speed of the supercooling valve according to the current superheat degree and the determined target superheat degree" is performed, the control method further includes: controlling the subcooling valve to open if at least one of the following conditions is met: the length of the refrigerating working condition of the multi-split air conditioning unit in the current operation reaches a first preset length; 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 greater than or equal to a first preset temperature difference; the low-pressure of the multi-split air conditioning unit is greater than or equal to a first preset low-pressure and less than or equal to a second preset low-pressure; and the compression ratio of the variable-frequency compressor is greater than or equal to a first preset compression ratio.
In a preferred embodiment of the control method for the multi-split air conditioning unit, after "controlling the opening degree and/or the adjustment speed of the supercooling valve according to the current superheat degree and the determined target superheat degree" is performed, the control method further includes: controlling the subcooling valve to close if at least one of the following conditions is met: the inverter compressor stops running; the duration time of the outdoor temperature being less than or equal to the fourth preset outdoor temperature reaches a 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 less than or equal to a second preset temperature difference, and the duration time reaches a third preset time length; the duration that the low-pressure of the multi-split air conditioning unit is less than the third preset low-pressure reaches a fourth preset duration; the duration that the low-pressure of the multi-split air conditioning unit is greater than the fourth preset low-pressure reaches a fifth preset duration; the duration that the compression ratio of the variable frequency compressor is smaller than the second preset compression ratio reaches a sixth preset duration; wherein the third preset low pressure is less than the fourth preset low pressure.
In a preferred embodiment of the control method for the multi-split air conditioning unit, the control method further includes, while or after "controlling 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 step of: acquiring the nominal capacity of all indoor units in the running 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 evaporation temperature.
In a preferred embodiment of the control method for the multi-split air conditioning unit, the target evaporation temperature is determined by the following formula: and ET is the target evaporation temperature, the value of 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 mu is the ratio.
In a preferred embodiment of the control method for the multi-split air conditioning unit, the correction coefficient k is 1.28.
As can be understood by those skilled in the art, in the technical solution of the present invention, the multi-split air conditioning unit includes an supercooling valve and an inverter compressor, and the control method for the multi-split air conditioning unit of the present invention includes: acquiring 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 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 a refrigerant, the heat exchange efficiency of the multi-split air conditioning unit is improved to the greatest extent, and the purposes of energy conservation and efficiency improvement are further achieved.
Drawings
FIG. 1 is a schematic view of the outdoor portion of the air conditioning assembly of 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 only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications. Also, while the steps of the method of the present invention are described herein in a particular order, these orders are not limiting, and one skilled in the art may perform the steps in a different order without departing from the basic principles of the invention.
It should be noted that in the description of the present embodiment, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", and the like are based on the direction or positional relationship shown in the drawings, and thus are only for convenience of description, and do not indicate or imply that the device or element 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.
Reference is first made to fig. 1, which is a schematic view of the structure of the outdoor portion of the air conditioning unit of the present invention. It should be noted that, in order to clearly show the electric devices of the outdoor part, only the structure of the outdoor part is shown in fig. 1, the outdoor part is connected to the indoor part through the liquid pipe stop valve and the gas pipe stop valve, and technicians can set the specific structure of the indoor part, for example, the number of indoor units, according to actual use requirements. 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 subcooling 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 by a main refrigerant pipeline, and the main refrigerant pipeline is further connected with an indoor portion by a liquid pipe stop valve and a gas pipe stop valve to realize 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 play a role in air supplementing and enthalpy increasing, 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 structure according to actual requirements, as long as the multi-split air conditioning unit is provided with the supercooling valve 16.
Further, the multi-split air conditioning unit further comprises a controller, wherein various standard data such as nominal capacity of each indoor unit and the like are stored in the controller, and the controller can also acquire detection data of each sensor, such as outdoor temperature and the like through an outdoor temperature sensor. In addition, the controller can also control the operation state of the multi-split air conditioning unit, for example, control the operation frequency of the inverter 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 type of the controller, and the controller may be an original controller of the multi-split air conditioning unit, or may be a controller separately configured to execute the control method of the present invention, and a technician may set the specific structure and type of the controller according to actual use requirements.
Referring next to fig. 2, a flow chart of the 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 in the foregoing embodiment, when the multi-split air conditioning unit operates in a cooling condition, the control method of the present invention mainly includes the following steps:
s1: acquiring 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 any specific manner in which the controller obtains the outdoor temperature, the controller may obtain the outdoor temperature by means of a temperature sensor provided in the multi-split air conditioning unit itself, or may obtain the outdoor temperature by means of networking, and this specific obtaining manner is not restrictive, and a technician may set the outdoor temperature by himself or herself according to actual use conditions.
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 invention does not limit the specific determination method, and the technician can set the method according to the actual use requirement, as long as the only target superheat degree can be determined according to the outdoor temperature; for example, it may be determined from the mapping relationship.
Next, in step S103, the controller may obtain a current superheat degree of the multi-split air conditioning unit, and in the preferred embodiment, the current superheat degree of the multi-split air conditioning unit refers to a difference between an inlet temperature and an outlet temperature of the outdoor heat exchanger 11, which is not limiting, and a technician may set an algorithm of the current superheat degree according to needs as long as the current superheat degree can reflect a refrigerant state. In addition, it should be noted that the execution timing of step S103 may be changed as long as the step of acquiring the current superheat degree of the multi-split air conditioning unit is executed before step S104, for example, step S104 may also be executed between step S101 and step S102, and such a change of the specific execution sequence does not depart from the basic principle of the present invention and belongs to the protection scope of the present invention.
Finally, in step S104, the controller controls the opening degree and/or the adjustment 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 always adapted to the operation state of the multi-split air conditioning unit, and the heat exchange efficiency of the multi-split air conditioning unit is further improved to the maximum extent.
It should be noted that, the specific control mode for controlling the opening degree and/or the adjustment speed of the subcooling valve according to the current superheat degree and the target superheat degree is not limited, and a technician can determine the specific control mode according to actual use requirements, for example, the technician can determine the unique opening degree and/or the adjustment speed by setting a certain mapping relationship 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 understood by those skilled in the art that the control method may control only the opening degree of the supercooling valve, may control only the adjustment speed of the supercooling valve, and may control both the opening degree 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 in the cooling condition, the preferred embodiment of the control method of the present invention specifically includes the following steps:
s101: acquiring 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, the opening degree of the supercooling valve is increased;
s105: determining the increasing speed of the supercooling valve according to the difference value of 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 of the current superheat degree and the target superheat degree;
s108: acquiring the nominal capacity of all indoor units in the running 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 evaporation temperature.
Before the preferred embodiment is performed, the controller also needs to selectively open the supercooling valve according to the opening condition of the supercooling valve, that is, the preferred embodiment is performed in the case where the supercooling valve has been opened.
As a preferred embodiment, the controller controls the subcooling valve to open only when the following five conditions are simultaneously satisfied:
condition 1: the length of time of the multi-split air conditioning unit under the refrigeration working condition reaches a first preset length of time.
In other words, the controller may determine whether the supercooling valve needs to be opened or not when the multi-split air conditioning unit has been stably operated. A technician can set a specific value of the first preset time according to actual use requirements, and only when the current operation time of the multi-split air conditioning unit reaches the first preset time, the multi-split air conditioning unit is in a stable operation state; 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 actual use requirements; 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 greater than or equal to a first preset temperature difference.
It should be noted that, a person skilled in the art can set the value of the first preset temperature difference according to actual use requirements; preferably, the first preset temperature difference is 30 ℃.
Condition 4: the low-pressure of the multi-split air conditioning unit is greater than or equal to a first preset low-pressure and less 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 1.35 MPa.
Condition 5: and controlling the opening of the supercooling valve if the compression ratio of the variable frequency compressor is greater than or equal to a first preset compression ratio.
It should be noted that, a person skilled in the art may set the specific value of the first preset compression ratio according to actual use requirements; preferably, the first preset compression ratio is 2.5.
It can be understood by those skilled in the art that, although the turn-on timing in the preferred embodiment is described as satisfying the above five turn-on conditions simultaneously; however, it is obvious to those skilled in the art that the opening timing can be set to satisfy the above partial conditions, and the specific setting manner is not changed without departing from the basic principle of the present invention, and the present invention falls within the protection scope of the present invention.
In addition, it should be noted that, generally, after the opening condition is satisfied, the controller directly adjusts the opening degree of the supercooling valve to a preset initial opening degree, and then selectively adjusts the opening degree according to the situation, so as to effectively ensure the effect of supplementing air and increasing enthalpy. Preferably, the preset initial opening is 32 pls.
In the case where the controller has controlled the supercooling valve to be open, step S101 is performed, i.e., the controller acquires the outdoor temperature. It should be noted that the present invention does not limit any specific manner in which the controller obtains the outdoor temperature, the controller may obtain the outdoor temperature by means of a temperature sensor provided in the multi-split air conditioning unit itself, or may obtain the outdoor temperature by means of networking, and this specific obtaining manner is not restrictive, and a technician may set the outdoor temperature by himself or herself according to actual use conditions.
After the outdoor temperature is obtained, step S102 is executed, that is, the controller determines a 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 degree of superheat is set to a first preset degree of superheat; when the outdoor temperature is a second preset outdoor temperature, the target superheat degree is set to be a second preset superheat degree; the first preset outdoor temperature is lower than the second preset outdoor temperature, and the first preset superheat degree is lower 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, namely, a unique relational expression can be determined through two end points, and in this case, a unique target superheat degree can be determined through a unique outdoor temperature. In addition, when the outdoor temperature is higher 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 considered at the same time.
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 also increased by 1 ℃ every time the outdoor temperature is increased by 1 ℃.
After the target superheat degree is determined and the current superheat degree is obtained, the controller can control the opening 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 method is as follows:
and under the condition that the target superheat degree is greater than the current superheat degree, the controller controls the opening of the supercooling valve to be increased, the increasing speed of the supercooling valve is determined according to the difference value of the target superheat degree and the current superheat degree, and 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, the reducing speed of the supercooling valve is determined 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 reducing speed is, so that the adjusting efficiency is effectively improved, and the problem of repeated adjustment is avoided.
Further, as a preferred embodiment, the controller controls the subcooling valve to be closed in the case where any one of the following six conditions is satisfied during or after the subcooling valve has been adjusted:
condition 1: and the inverter compressor stops running.
Condition 2: and the duration time of the outdoor temperature which is less than or equal to the fourth preset outdoor temperature reaches a second preset time length.
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 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 that 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 a second preset temperature difference reaches a third preset duration time.
It should be noted that, a person skilled in the art can set specific values of the second preset temperature difference and the third preset time length according to actual use requirements; preferably, the second preset temperature difference is 20 ℃, and the third preset time period is 1 minute.
Condition 4: and the duration that the low-pressure of the multi-split air conditioning unit is less than the third preset low-pressure reaches a fourth preset duration.
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 time 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 that the low-pressure of the multi-split air conditioning unit is greater than the fourth preset low-pressure reaches a fifth preset duration.
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 time period 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: and the duration that the compression ratio of the variable-frequency compressor is less than the second preset compression ratio reaches a sixth preset duration.
It should be noted that, a person skilled in the art may set specific values of the second preset compression ratio and the sixth preset duration according to actual use requirements; preferably, the second preset compression ratio is 2, and the sixth preset time period 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 above six closing conditions; however, it is obvious to the skilled person that the closing timing can also be set to satisfy the above conditions, and the specific setting manner may be changed without departing from the basic principle of the present invention, and falls within the protection scope of the present invention.
After the opening degree of the supercooling valve is adjusted, the overall operation condition of the multi-split air conditioning unit is changed, and in this case, 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 manner for the frequency of the inverter compressor is as follows:
in step S108, the controller can obtain the nominal capacities of all the operating indoor units, which are the indoor units performing heat exchange. It should be noted that, the present invention does not limit the initial operating frequency of the inverter compressor, and technicians can set the frequency according to actual requirements, that is, when the indoor unit is turned on, the inverter compressor operates at the initial operating frequency. Next, step S109 is executed, and the controller calculates the sum of the nominal capacities of all the indoor units in the operating state; of course, this calculation process can be performed by the controller, or can be performed by other devices and acquired by the controller. Similarly, the calculation process of step S110 may also be completed by the controller, or completed by another device and obtained by the controller.
Then, the controller determines a target evaporation temperature according to the ratio (namely, the starting load rate of the multi-split air conditioning unit), the outdoor temperature and the current operation mode of the multi-split air conditioning unit. In the preferred embodiment, when the multi-split air conditioning unit operates in the refrigeration working condition, two operation modes are available, one is an effect mode (namely a conventional refrigeration mode), and the other is an energy-saving mode; of course, this is not limitative and the skilled person can adapt himself 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 the step of determining the target evaporation temperature ET according to the following formula:
ET＝a+k*μ
and determining the value of a according to the outdoor temperature and the current operation mode of the multi-split air conditioning unit, wherein k is a correction coefficient, and mu is the ratio (namely the starting load rate of the multi-split air conditioning unit).
It should be noted that, in general, 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 conditioning unit is as follows:
| outdoor temperature TAO | In the effect mode, the value of a | Value of a in the energy saving mode |
| 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 by the above table is only a preferred embodiment, and those skilled in the art can adjust the specific setting manner thereof 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 only target evaporation pressure can be determined according to the determined target evaporation temperature, the current evaporation pressure of the multi-split air conditioning 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 adjusting speed can be determined by the difference value of 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 the operation refrigeration working condition of the multi-split air-conditioning unit until the whole multi-split air-conditioning unit can stably and efficiently operate.
Taking a multi-split air conditioning unit with a 10HP outdoor unit matched with 4 2.5HP indoor units as an example, when the air conditioning unit operates in an effect mode and the outdoor temperature is 35 ℃, the value of a at this time is 2 ℃ as can be known from the above table. In this case, the adjustment manner of the inverter compressor is divided into the following four cases:
case 1(4 indoor units fully on and current evaporating pressure greater than target evaporating pressure): the ratio of the sum of the nominal capacities of the indoor units in the operating state to the sum of the nominal capacities of all the indoor units, namely, the start load rate is (2.5+2.5+ 2.5)/(2.5+ 2.5) × 100% ═ 100%, the target evaporation temperature ET is 2+1.28 × 100% ═ 3.28 ℃, the target evaporation pressure corresponding to the target evaporation temperature of 3.28 ℃ is 7.9bar, and if the current evaporation pressure is 8.5bar (i.e., the current evaporation pressure is greater than the target evaporation pressure), the controller controls the inverter compressor to perform frequency increase until the current evaporation pressure reaches the target evaporation pressure or the frequency of the inverter compressor has increased to the maximum value.
Case 2(2 indoor machines on and current evaporating pressure greater than target evaporating pressure): the ratio of the sum of the nominal capacities of the indoor units in the operating 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) × 100% ═ 50%, the target evaporation temperature ET ═ 2+ 1.28% ═ 2.64 ℃, the target evaporation pressure corresponding to the target evaporation temperature of 2.64 ℃ is 7.73bar, and if the current bar evaporation pressure at the moment is 8.5bar (namely, the current evaporation pressure is greater than the target evaporation pressure), the controller controls the variable frequency compressor to perform frequency increase until the current evaporation pressure reaches the target evaporation pressure or the frequency of the variable frequency compressor is increased to the maximum value.
Case 3(4 indoor units fully on and current evaporating pressure less than target evaporating pressure): the ratio of the sum of the nominal capacities of the indoor units in the operating state to the sum of the nominal capacities of all the indoor units, namely, the start load rate is (2.5+2.5+ 2.5)/(2.5+ 2.5) × 100% ═ 100%, the target evaporation temperature ET is 2+1.28 × 100% ═ 3.28 ℃, the target evaporation pressure corresponding to the target evaporation temperature of 3.28 ℃ is 7.9bar, and if the current evaporation pressure is 6.5bar (i.e., the current evaporation pressure is less than the target evaporation pressure), the controller controls the inverter compressor to perform frequency reduction until the current evaporation pressure reaches the target evaporation pressure or the frequency of the inverter compressor has increased to the minimum value.
Case 4(2 indoor machines on and current evaporating pressure greater than target evaporating pressure): the ratio of the sum of the nominal capacities of the indoor units in the operating 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) × 100% ═ 50%, the target evaporation temperature ET ═ 2+ 1.28% ═ 50% > -2.64 ℃, the target evaporation pressure corresponding to the target evaporation temperature of 2.64 ℃ is 7.73bar, and if the current bar evaporation pressure at the moment is 6.5bar (namely, the current evaporation pressure is less than the target evaporation pressure), the controller controls the variable frequency compressor to perform frequency reduction until the current evaporation pressure reaches the target evaporation pressure or the frequency of the variable frequency compressor is raised to the lowest value.
So far, the technical solutions of the present invention have 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 the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the basic principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A control method for a multi-split air conditioning unit is characterized in that the multi-split air conditioning unit comprises an supercooling valve and an inverter compressor, and under the condition that the multi-split air conditioning unit operates under a refrigeration working condition, the control method comprises the following steps:
acquiring 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 and/or the adjusting speed of the supercooling valve according to the current superheat degree and the determined target superheat degree.
2. The control method according to claim 1, wherein the step of controlling the opening degree and/or the adjustment speed of the supercooling valve based on the current superheat degree and the determined target superheat degree comprises:
if the target superheat degree is larger than the current superheat degree, increasing the opening degree of the supercooling valve; and/or
And if the target superheat degree is less than the current superheat degree, reducing the opening degree of the supercooling valve.
3. The control method according to claim 2, wherein the step of controlling the opening degree and/or the adjustment speed of the supercooling valve based on the current superheat degree and the determined target superheat degree further comprises:
under the condition that the target superheat degree is larger than the current superheat degree, determining the increasing speed of the supercooling valve according to the difference value of the target superheat degree and the current superheat degree; and/or
And under the condition that the target superheat degree is smaller than the current superheat degree, determining the reducing speed of the supercooling valve according to the difference value of the current superheat degree and the target superheat degree.
4. The control method as claimed in claim 1, wherein the step of determining the target degree of superheat of the multi-split air conditioning unit based on the outdoor temperature comprises:
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 a first preset superheat degree and less than or equal to a second preset superheat degree, and the target superheat degree and the outdoor temperature are in linear correlation.
5. The control method as claimed in claim 4, wherein the step of determining the target degree of superheat of the multi-split air conditioning unit based on the outdoor temperature further comprises:
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.
6. The control method according to any one of claims 1 to 5, characterized in that before "controlling the opening degree and/or the adjustment speed of the supercooling valve based on the current superheat and the determined target superheat" is performed, the control method further comprises: controlling the subcooling valve to open if at least one of the following conditions is met:
the length of the refrigerating working condition of the multi-split air conditioning unit in the current operation reaches a first preset length;
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 greater than or equal to a first preset temperature difference;
the low-pressure of the multi-split air conditioning unit is greater than or equal to a first preset low-pressure and less than or equal to a second preset low-pressure;
and the compression ratio of the variable-frequency compressor is greater than or equal to a first preset compression ratio.
7. The control method according to any one of claims 1 to 5, characterized in that after "controlling the opening degree and/or the adjustment speed of the supercooling valve based on the current superheat and the determined target superheat" is performed, the control method further comprises: controlling the subcooling valve to close if at least one of the following conditions is met:
the inverter compressor stops running;
the duration time of the outdoor temperature being less than or equal to the fourth preset outdoor temperature reaches a 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 less than or equal to a second preset temperature difference, and the duration time reaches a third preset time length;
the duration that the low-pressure of the multi-split air conditioning unit is less than the third preset low-pressure reaches a fourth preset duration;
the duration that the low-pressure of the multi-split air conditioning unit is greater than the fourth preset low-pressure reaches a fifth preset duration;
the duration that the compression ratio of the variable frequency compressor is smaller than the second preset compression ratio reaches a sixth preset duration;
wherein the third preset low pressure is less than the fourth preset low pressure.
8. The control method according to any one of claims 1 to 5, characterized in that, while or after "controlling the opening degree and/or the adjustment speed of the supercooling valve based on the current superheat and the determined target superheat" is performed, the control method further comprises:
acquiring the nominal capacity of all indoor units in the running 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 evaporation temperature.
9. The control method according to claim 8, wherein the target evaporation temperature is determined by the following equation:
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 operation mode of the multi-split air conditioning unit, k is a correction coefficient, and mu is the ratio.
10. The control method according to claim 9, characterized in that the correction coefficient k is 1.28.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010619551.1A CN111928410B (en) | 2020-06-30 | 2020-06-30 | Control method for multi-split air conditioning unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010619551.1A CN111928410B (en) | 2020-06-30 | 2020-06-30 | Control method for multi-split air conditioning unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111928410A true CN111928410A (en) | 2020-11-13 |
| CN111928410B CN111928410B (en) | 2023-05-26 |
Family
ID=73317010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010619551.1A Active CN111928410B (en) | 2020-06-30 | 2020-06-30 | Control method for multi-split air conditioning unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111928410B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112944514A (en) * | 2021-02-25 | 2021-06-11 | 青岛海尔空调电子有限公司 | Heat pump air conditioning unit and control method thereof |
| 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 |
Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101427087A (en) * | 2006-04-27 | 2009-05-06 | 大金工业株式会社 | Air conditioner |
| CN102418981A (en) * | 2011-11-09 | 2012-04-18 | 青岛海尔空调电子有限公司 | Method for controlling operation of air conditioner in mute mode |
| CN104457072A (en) * | 2014-11-20 | 2015-03-25 | 珠海格力电器股份有限公司 | Electronic expansion valve control method and device and refrigerating/heating system |
| CN104596172A (en) * | 2010-03-12 | 2015-05-06 | 三菱电机株式会社 | Refrigeration air conditioning device |
| CN104748426A (en) * | 2015-03-31 | 2015-07-01 | 广东美的暖通设备有限公司 | Multi-split system |
| CN104748321A (en) * | 2013-12-30 | 2015-07-01 | 海尔集团公司 | Air conditioning system applicable to high-altitude areas and control method of air conditioning system |
| CN105571076A (en) * | 2016-01-20 | 2016-05-11 | 青岛海尔空调电子有限公司 | Control method for refrigerating of water-cooled multi-split air conditioner |
| CN105928064A (en) * | 2016-04-29 | 2016-09-07 | 广东美的暖通设备有限公司 | VRV system and valve control method for supercooling loop of VRV system |
| CN106123227A (en) * | 2016-06-28 | 2016-11-16 | 广东美的暖通设备有限公司 | Multiple on-line system and control method thereof |
| CN106524338A (en) * | 2016-11-25 | 2017-03-22 | 广东美的暖通设备有限公司 | Control method for multi-split system and supercooling circuit valve body thereof |
| CN107062580A (en) * | 2017-03-21 | 2017-08-18 | 珠海格力电器股份有限公司 | It is a kind of to reduce the control method and multi-gang air-conditioner of noise of indoor unit of air conditioner |
| CN107559953A (en) * | 2017-08-15 | 2018-01-09 | 广东美的暖通设备有限公司 | Multiple on-line system and its control method and device that loop valve body is subcooled |
| CN107631436A (en) * | 2017-10-25 | 2018-01-26 | 广东美的暖通设备有限公司 | Control method and system of the multi-connected air conditioner device under cooling condition |
| CN107906778A (en) * | 2017-11-13 | 2018-04-13 | 南京天加环境科技有限公司 | The control system and control method of multi-gang air-conditioner unit air injection enthalpy-increasing jet amount |
| CN109186141A (en) * | 2018-08-14 | 2019-01-11 | 四川虹美智能科技有限公司 | A kind of supercooling economizer control method, supercooling control device and multi-line system |
| CN208544085U (en) * | 2018-07-24 | 2019-02-26 | 山东通盛制冷设备有限公司 | A kind of energy-saving low-temperature heat pump air conditioner control system for electric coach |
| CN109798627A (en) * | 2019-01-15 | 2019-05-24 | 广东美的暖通设备有限公司 | The control method and device of multi-line system |
| CN111059663A (en) * | 2019-12-28 | 2020-04-24 | 维克（天津）有限公司 | Ultra-low temperature air cooling module machine part heat recovery unit and control mode |
| CN111256395A (en) * | 2018-11-30 | 2020-06-09 | 上海海立电器有限公司 | Vapor-supplementing and enthalpy-increasing system and control method thereof |
| CN111322723A (en) * | 2020-03-11 | 2020-06-23 | 广东美的暖通设备有限公司 | Multi-split air conditioning system, control method and control device thereof, and storage medium |
-
2020
- 2020-06-30 CN CN202010619551.1A patent/CN111928410B/en active Active
Patent Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101427087A (en) * | 2006-04-27 | 2009-05-06 | 大金工业株式会社 | Air conditioner |
| CN104596172A (en) * | 2010-03-12 | 2015-05-06 | 三菱电机株式会社 | Refrigeration air conditioning device |
| CN102418981A (en) * | 2011-11-09 | 2012-04-18 | 青岛海尔空调电子有限公司 | Method for controlling operation of air conditioner in mute mode |
| CN104748321A (en) * | 2013-12-30 | 2015-07-01 | 海尔集团公司 | Air conditioning system applicable to high-altitude areas and control method of air conditioning system |
| CN104457072A (en) * | 2014-11-20 | 2015-03-25 | 珠海格力电器股份有限公司 | Electronic expansion valve control method and device and refrigerating/heating system |
| CN104748426A (en) * | 2015-03-31 | 2015-07-01 | 广东美的暖通设备有限公司 | Multi-split system |
| CN105571076A (en) * | 2016-01-20 | 2016-05-11 | 青岛海尔空调电子有限公司 | Control method for refrigerating of water-cooled multi-split air conditioner |
| CN105928064A (en) * | 2016-04-29 | 2016-09-07 | 广东美的暖通设备有限公司 | VRV system and valve control method for supercooling loop of VRV system |
| CN106123227A (en) * | 2016-06-28 | 2016-11-16 | 广东美的暖通设备有限公司 | Multiple on-line system and control method thereof |
| CN106524338A (en) * | 2016-11-25 | 2017-03-22 | 广东美的暖通设备有限公司 | Control method for multi-split system and supercooling circuit valve body thereof |
| CN107062580A (en) * | 2017-03-21 | 2017-08-18 | 珠海格力电器股份有限公司 | It is a kind of to reduce the control method and multi-gang air-conditioner of noise of indoor unit of air conditioner |
| CN107559953A (en) * | 2017-08-15 | 2018-01-09 | 广东美的暖通设备有限公司 | Multiple on-line system and its control method and device that loop valve body is subcooled |
| CN107631436A (en) * | 2017-10-25 | 2018-01-26 | 广东美的暖通设备有限公司 | Control method and system of the multi-connected air conditioner device under cooling condition |
| CN107906778A (en) * | 2017-11-13 | 2018-04-13 | 南京天加环境科技有限公司 | The control system and control method of multi-gang air-conditioner unit air injection enthalpy-increasing jet amount |
| CN208544085U (en) * | 2018-07-24 | 2019-02-26 | 山东通盛制冷设备有限公司 | A kind of energy-saving low-temperature heat pump air conditioner control system for electric coach |
| CN109186141A (en) * | 2018-08-14 | 2019-01-11 | 四川虹美智能科技有限公司 | A kind of supercooling economizer control method, supercooling control device and multi-line system |
| CN111256395A (en) * | 2018-11-30 | 2020-06-09 | 上海海立电器有限公司 | Vapor-supplementing and enthalpy-increasing system and control method thereof |
| CN109798627A (en) * | 2019-01-15 | 2019-05-24 | 广东美的暖通设备有限公司 | The control method and device of multi-line system |
| CN111059663A (en) * | 2019-12-28 | 2020-04-24 | 维克（天津）有限公司 | Ultra-low temperature air cooling module machine part heat recovery unit and control mode |
| CN111322723A (en) * | 2020-03-11 | 2020-06-23 | 广东美的暖通设备有限公司 | Multi-split air conditioning system, control method and control device thereof, and storage medium |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112944514A (en) * | 2021-02-25 | 2021-06-11 | 青岛海尔空调电子有限公司 | Heat pump air conditioning unit and control method thereof |
| CN112944514B (en) * | 2021-02-25 | 2023-08-15 | 青岛海尔空调电子有限公司 | Heat pump air conditioner unit and control method thereof |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111928410B (en) | 2023-05-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110715466A (en) | Multi-connected air conditioning system and control method thereof | |
| US6779356B2 (en) | Apparatus and method for controlling operation of air conditioner | |
| US6843067B2 (en) | Air conditioner and method for controlling electronic expansion valve of air conditioner | |
| CN110337570B (en) | Air conditioner | |
| CN105371545A (en) | An air conditioner and a refrigerant circulation quantity adjusting method for a refrigeration system thereof | |
| EP3260792A1 (en) | Air conditioning system control device, air conditioning system, air conditioning control program, and air conditioning system control method | |
| KR100378822B1 (en) | Power saving air cooling method of inverter air-conditioner driving | |
| CN111928410B (en) | Control method for multi-split air conditioning unit | |
| US20040098993A1 (en) | Air conditioner and method for controlling the same | |
| EP3104102B1 (en) | Air conditioner and operation method of the same | |
| KR20060066838A (en) | Method for controlling indoor unit of multi-air conditioner | |
| CN213089944U (en) | Constant temperature refrigerating plant | |
| EP2434232A2 (en) | Control of a transcritical vapor compression system | |
| CN211552102U (en) | Multi-connected air conditioning system | |
| CN114857665B (en) | Multi-split air conditioner system | |
| CN117642585A (en) | Multi-split air conditioning system and fault-tolerant control method thereof | |
| CN112984713B (en) | Multi-compressor control method and air conditioning unit | |
| CN113959080B (en) | Control method for electronic expansion valve of air conditioning unit | |
| CN112797520B (en) | Air conditioner and AHU unit temperature control method | |
| CN115978751A (en) | Frequency conversion direct expansion machine | |
| JP3760259B2 (en) | Air conditioner | |
| CN113237258A (en) | Air conditioning unit and defrosting control method thereof | |
| CN112797580A (en) | Control method of multi-split air conditioner and multi-split air conditioner | |
| CN114857664B (en) | Multi-split air conditioner system | |
| WO2024062550A1 (en) | Air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20230118 Address after: 266101 Haier Industrial Park, 1 Haier Road, Laoshan District, Shandong, Qingdao Applicant after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Applicant after: QINGDAO HAIER AIR-CONDITIONING ELECTRONIC Co.,Ltd. Applicant after: Haier Zhijia Co.,Ltd. Address before: 266101 Haier Industrial Park, 1 Haier Road, Laoshan District, Shandong, Qingdao Applicant before: QINGDAO HAIER AIR-CONDITIONING ELECTRONIC Co.,Ltd. Applicant before: Haier Zhijia Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |