CN113834175A - Compressor frequency control method for multi-split air conditioning unit - Google Patents
Compressor frequency control method for multi-split air conditioning unit Download PDFInfo
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- CN113834175A CN113834175A CN202010582780.0A CN202010582780A CN113834175A CN 113834175 A CN113834175 A CN 113834175A CN 202010582780 A CN202010582780 A CN 202010582780A CN 113834175 A CN113834175 A CN 113834175A
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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
- F24F11/62—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
- F24F11/86—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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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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- 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 compressor frequency control method for a multi-split air conditioning unit. The invention aims to solve the problem that the continuous and efficient operation of the existing multi-split air conditioning unit is difficult to guarantee due to the poor frequency control mode of the compressor of the multi-split air conditioning unit. To this end, the compressor frequency control method of the present invention comprises: acquiring the capacity requirements of all indoor units in the running state; calculating the sum of the capacity requirements of all the indoor units in the running state; determining a target parameter value according to the sum of the capacity requirements; adjusting the frequency of the compressor according to the determined target parameter value; when the multi-split air conditioning unit is in a refrigeration working condition, the target parameter value is a target evaporation temperature; and when the multi-split air conditioning unit is in a heating working condition, the target parameter value is the target condensation temperature. The invention adjusts the frequency of the compressor according to the sum of the capacity requirements of all the indoor units in the running state, so as to effectively give consideration to the heat exchange requirements of all the indoor units in the running state.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a compressor frequency control method for a multi-split air conditioning unit.
Background
Along with the continuous improvement of people's standard of living, air conditioning unit has become a heat transfer equipment that people's life is essential, and variable frequency compressor is as the core component of many online air conditioning unit, and its control logic often plays decisive effect to the heat exchange efficiency of whole many online air conditioning unit. The existing multi-split air conditioning unit generally controls the variable frequency compressor to operate at a fixed preset initial frequency, and then directly adjusts the frequency of the variable frequency compressor through the water outlet temperature of the air conditioning unit. Although the control mode is favorable for directly controlling the outlet water temperature, the different capacity requirements of each indoor unit are not comprehensively considered; and the control mode adopts the same control logic under the refrigerating working condition and the heating working condition, and does not combine the difference of the operating working conditions for adjustment, so that the precise control of the variable frequency compressor is difficult to realize, and the multi-split air conditioning unit is difficult to ensure to be capable of always maintaining the high-efficiency operation state.
Accordingly, there is a need in the art for a new compressor frequency 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 multi-split air conditioning unit is difficult to maintain an efficient operation state all the time due to the poor control method of the existing inverter compressor, the present invention provides a compressor frequency control method for the multi-split air conditioning unit, the multi-split air conditioning unit of the present invention includes a plurality of indoor units, and the compressor frequency control method includes: acquiring the capacity requirements of all indoor units in the running state; calculating the sum of the capacity requirements of all the indoor units in the running state; determining a target parameter value according to the sum of the capacity requirements; adjusting the frequency of the compressor according to the determined target parameter value; when the multi-split air conditioning unit is in a refrigeration working condition, the target parameter value is a target evaporation temperature; and when the multi-split air conditioning unit is in a heating working condition, the target parameter value is a target condensation temperature.
In the above preferred technical solution of the method for controlling the frequency of the compressor of the multi-split air conditioning unit, "determining the target parameter value according to the sum of the capacity demands" specifically includes: acquiring outdoor temperature; determining the value range of a target parameter value according to the outdoor temperature; and determining the target parameter value according to the value range of the target parameter value and the sum of the capacity requirements.
In the above preferred technical solution of the method for controlling the frequency of the compressor of the multi-split air conditioning unit, the step of "determining the value range of the target parameter value according to the outdoor temperature" when the multi-split air conditioning unit is in the cooling condition specifically includes: determining a first preset evaporation temperature according to the outdoor temperature; determining the first preset evaporation temperature as the left end point of a value range; determining the second preset evaporation temperature as the right end point of the value range; and determining the value range of the target evaporation temperature according to the determined left end point and the right end point.
In the above preferred technical solution of the method for controlling the frequency of the compressor of the multi-split air conditioning unit, "determining the target parameter value according to the sum of the value range of the target parameter value and the capacity requirement" includes: and when the sum of the capacity requirements is greater than or equal to a first preset value and less than or equal to a second preset value, the value of the target evaporation temperature is within the value range of the target parameter value, and the sum of the capacity requirements is linearly related to the target evaporation temperature.
In the above preferred technical solution of the method for controlling the frequency of the compressor of the multi-split air conditioning unit, "determining the target parameter value according to the sum of the value range of the target parameter value and the capacity requirement" further includes: when the sum of the capacity requirements is smaller than the first preset value, determining the target evaporation temperature as the second preset evaporation temperature; and/or when the sum of the capacity demands is greater than the second preset value, the target evaporation temperature is determined as the first preset evaporation temperature.
In the above preferred technical solution of the method for controlling the frequency of the compressor of the multi-split air conditioning unit, the step of "determining the value range of the target parameter value according to the outdoor temperature" when the multi-split air conditioning unit is in the heating condition specifically includes: determining a first preset condensing temperature according to the outdoor temperature; determining the first preset condensing temperature as the right end point of a value range; determining the second preset condensing temperature as the left end point of the value range; and determining the value range of the target condensation temperature according to the determined left end point and the right end point.
In the above preferred technical solution of the method for controlling the frequency of the compressor of the multi-split air conditioning unit, "determining the target parameter value according to the sum of the value range of the target parameter value and the capacity requirement" includes: and when the sum of the capacity demands is greater than or equal to a third preset value and less than or equal to a fourth preset value, the value of the target condensation temperature is within the value range of the target parameter value, and the sum of the capacity demands is linearly related to the target condensation temperature.
In the above preferred technical solution of the method for controlling the frequency of the compressor of the multi-split air conditioning unit, "determining the target parameter value according to the sum of the value range of the target parameter value and the capacity requirement" further includes: when the sum of the capacity demands is less than the third preset value, the target condensing temperature is determined as the second preset condensing temperature; and/or when the sum of the capacity demands is greater than the fourth preset value, the target condensing temperature is determined as the first preset condensing temperature.
In the preferred technical solution of the above method for controlling the frequency of the compressor of the multi-split air conditioning unit, "acquiring the capacity requirements of all the indoor units in the operating state" specifically includes: acquiring the set temperature of all indoor units in the running state and the indoor temperature of the environment where the indoor units are located; calculating a difference value between the indoor temperature and the set temperature; determining a capacity demand coefficient of the indoor unit according to the difference value between the indoor temperature and the set temperature; and determining the capacity requirement of the indoor unit according to the capacity requirement coefficient and the nominal capacity of the indoor unit.
In the above preferred technical solution of the compressor frequency control method for a multi-split air conditioning unit, before the step of "obtaining the capacity requirements of all the indoor units in an operating state", the compressor frequency control method further includes: acquiring nominal capacity of all indoor units to be operated; calculating the sum of the nominal capacities of all the indoor units to be operated; calculating the ratio of the sum of the nominal capacities of all the indoor units to be operated to the nominal capacity of the outdoor unit; and determining the initial operating frequency of the compressor according to the ratio and the rated initial frequency of the compressor.
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 a plurality of indoor units, and the compressor frequency control method of the present invention includes: acquiring the capacity requirements of all indoor units in the running state; calculating the sum of the capacity requirements of all the indoor units in the running state; determining a target parameter value according to the sum of the capacity requirements; adjusting the frequency of the compressor according to the determined target parameter value; when the multi-split air conditioning unit is in a refrigeration working condition, the target parameter value is a target evaporation temperature; and when the multi-split air conditioning unit is in a heating working condition, the target parameter value is a target condensation temperature. The frequency of the compressor is adjusted through the sum of the capacity requirements of all the indoor units in the running state, so that the heat exchange requirements of all the indoor units in the running state are effectively considered, and the compressor is controlled more accurately by selecting different target parameter values under different working conditions, so that the multi-split air conditioning unit can be effectively ensured to be in a high-efficiency running state all the time.
Furthermore, the invention also determines the value range of the target parameter value by acquiring the outdoor temperature, and then determines the target parameter value according to the sum of the determined value range and the capacity requirement, so that the target parameter value is more accurately determined by effectively combining outdoor environment factors, more accurate control is effectively ensured, and the operating efficiency of the multi-split air conditioning unit is further improved to the greatest extent.
Drawings
FIG. 1 is a flow chart of the main steps of the compressor frequency control method of the present invention;
FIG. 2 is a flow chart of the detailed steps of the first preferred embodiment of the present invention;
FIG. 3 is a graph of the difference between the indoor temperature and the set temperature and the capacity demand coefficient in the first preferred embodiment;
FIG. 4 is a graph of the sum of capacity demands versus target evaporating temperature for the first preferred embodiment;
FIG. 5 is a flowchart of the detailed steps of a second preferred embodiment of the present invention;
FIG. 6 is a graph of the difference between the indoor temperature and the set temperature and the capacity demand coefficient in the second preferred embodiment;
fig. 7 is a graph of the sum of capacity demands versus target condensing temperature for the second preferred embodiment.
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.
It should be noted that in the description of the present invention, although the steps of the control method of the present invention are described in a specific order in the present application, the order is not limited, and those skilled in the art can perform the steps in a different order without departing from the basic principle of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Specifically, the multi-split air conditioning unit in the preferred embodiment includes an outdoor unit and three indoor units connected to the outdoor unit, the outdoor unit is provided with a variable frequency compressor, and a user can set different temperatures for the three indoor units respectively. It should be noted that the invention does not limit the specific structure of the multi-split air conditioning unit, and technicians can set the structure according to actual use requirements; for example, the technician can set the type and number of indoor units by himself.
In addition, the multi-split air conditioning unit further comprises a controller, wherein various standard data such as nominal capacities of the outdoor unit and each indoor unit, rated initial frequency of the compressor and the like are stored in the controller, detection data of each sensor can be obtained, such as outdoor temperature and the like obtained through an outdoor temperature sensor, and the controller can also control operation of the multi-split air conditioning unit, such as 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 perform the compressor frequency 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 first to fig. 1, a flow chart of the main steps of the compressor frequency control method of the present invention is shown. As shown in fig. 1, based on the multi-split air conditioning unit described in the above embodiment, the method for controlling the frequency of the compressor of the present invention mainly includes the following steps:
s1: acquiring the capacity requirements of all indoor units in the running state;
s2: calculating the sum of the capacity requirements of all the indoor units in the running state;
s3: determining a target parameter value according to the sum of the capacity requirements;
s4: and adjusting the frequency of the compressor according to the determined target parameter value.
In step S1, the controller can obtain the capacity requirement of all the indoor units in operation, which is the indoor unit 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 frequency according to the actual use requirement, that is, when the indoor unit is turned on, the inverter compressor can operate at the initial operating frequency first. That is, the present invention does not limit the execution timing of steps S1 to S4, and the technician can set the execution timing according to the actual use requirement; for example, after the inverter compressor is operated at an initial operating frequency for a preset time. In addition, it should be noted that, the present invention does not limit the specific way in which the controller obtains the capacity requirement of the indoor unit, and the technician can set the capacity requirement according to the actual use requirement. Next, in step S2, the controller may calculate the sum of the capacity demands 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.
Further, in step S3, the controller may determine a target parameter value according to the calculated sum of the capacity demands, where the target parameter value is a target evaporation temperature when the multi-split air conditioning unit is in the cooling condition; and when the multi-split air conditioning unit is in a heating working condition, the target parameter value is a target condensation temperature. Next, in step S4, the controller can adjust the frequency of the inverter compressor according to the determined target parameter value. In other words, when the multi-split air conditioning unit is in a refrigerating working condition, the controller can determine a target evaporation temperature according to the calculated sum of capacity requirements, and then adjust the frequency of the variable frequency compressor according to the determined target evaporation temperature; when the multi-split air conditioning unit is in a heating working condition, the controller can determine a target condensation temperature according to the calculated sum of capacity requirements, and then adjust the frequency of the variable frequency compressor according to the determined target condensation temperature. The frequency of the variable-frequency compressor is adjusted through the sum of the capacity requirements of all the indoor units in the running state, so that the heat exchange requirements of all the indoor units in the running state are effectively considered, and the variable-frequency compressor is controlled more accurately by selecting different target parameter values under different working conditions, so that the multi-split air conditioning unit can be effectively ensured to be in a high-efficiency running state all the time.
Further, as a preferred embodiment, the present invention further provides a method for determining an initial operating frequency of an inverter compressor, which specifically includes: the controller acquires nominal capacities of all indoor units to be operated; then, the controller can calculate the sum of the nominal capacities of all the indoor units to be operated; then, the controller calculates the ratio of the sum of the nominal capacities of all the indoor units to be operated to the nominal capacity of the outdoor unit, namely the capacity output coefficient of the multi-split air conditioning unit; finally, the controller can determine the initial operating frequency of the inverter compressor according to the calculated ratio (i.e., the power output coefficient) and the rated initial frequency of the inverter compressor, preferably by calculating the product of the ratio and the rated initial frequency as the initial operating frequency of the inverter compressor. Of course, this determination method is not limited, and a technician may set the specific determination method of the initial operating frequency according to the actual use requirement; for example, the product of the ratio and the rated initial frequency may be multiplied by a scaling factor, which is preferably set between 90% and 110%, and then used as the initial operating frequency of the inverter compressor.
Referring next to fig. 2, a flowchart illustrating specific steps of the first preferred embodiment 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 is in a cooling condition, a first preferred embodiment of the method for controlling the frequency of the compressor of the present invention specifically includes the following steps:
s101: acquiring the set temperature of all indoor units in the running state and the indoor temperature of the environment where the indoor units are located;
s102: calculating the difference value between the indoor temperature and the set temperature;
s103: determining a capacity demand coefficient of the indoor unit according to the difference value of the indoor temperature and the set temperature;
s104: determining the capacity requirement of the indoor unit according to the capacity requirement coefficient and the nominal capacity of the indoor unit;
s105: calculating the sum of the capacity requirements of all the indoor units in the running state;
s106: acquiring outdoor temperature;
s107: determining the value range of the target evaporation temperature according to the outdoor temperature;
s108: determining a target evaporation temperature according to the sum of the determined value range and the capacity requirement;
s109: and adjusting the frequency of the compressor according to the determined target evaporation temperature.
In steps S101 to S104 of the preferred embodiment, the present invention provides a method for determining a capacity requirement of an indoor unit in an operating state, and the method specifically includes: the controller obtains the set temperature of the indoor unit in the running state and the indoor temperature of the environment where the indoor unit is located, the controller can obtain the indoor temperature of the environment where the indoor unit is located through a temperature sensor which is self-configured on the indoor unit, and can also obtain the indoor temperature of the environment where the indoor unit is located through an external temperature sensor, which is not restrictive, and technicians can set the temperature by themselves. The controller can then calculate the difference Δ E between the acquired indoor temperature and the set temperature, which can be done by the controller itself or by other means.
Further, the controller can determine the capacity demand coefficient of the indoor unit according to the difference Δ E calculated in step S102, and as a preferred embodiment, the relationship between the difference Δ E and the capacity demand coefficient of the indoor unit can be determined by using a relationship diagram as shown in fig. 3, that is, the capacity demand coefficient k of the indoor unit is set to be between 0 and 14, and then a specific value of the capacity demand coefficient k is selected according to the magnitude of the difference Δ E between the indoor temperature and the set temperature. It should be noted that the skilled person may also set the capacity requirement coefficient k between 0 and 1, and this specific setting manner may be changed by himself or herself as long as it can represent the ratio. As shown in fig. 3, specifically, when the difference Δ E between the indoor temperature and the set temperature is less than 0 ℃, the capacity demand coefficient k is also 0; when the difference delta E between the indoor temperature and the set temperature is more than 5 ℃, the capacity demand coefficient k is 14; when the difference Δ E between the indoor temperature and the set temperature is between 0 ℃ and 5 ℃ (including 0 ℃ and 5 ℃), the capacity demand coefficient k is set between 0 ℃ and 14 (including 0 and 14), and the difference Δ E between the indoor temperature and the set temperature and the capacity demand coefficient k are in a linear positive correlation relationship. After the capacity demand coefficient of the indoor unit is determined, the controller can determine the capacity demand of the indoor unit according to the capacity demand coefficient of the indoor unit and the nominal capacity of the indoor unit, and specifically, the product of the capacity demand coefficient of the indoor unit and the nominal capacity of the indoor unit is the capacity demand of the indoor unit. The controller can determine the capacity requirements of all the indoor units in the running state one by one in the above manner, and after the capacity requirements of all the indoor units in the running state are obtained, step S105 is executed, that is, the controller calculates the sum of the capacity requirements of all the indoor units in the running state for subsequent use.
In step S106, the controller can acquire an outdoor temperature; it should be noted that, the present invention does not set any limitation on the specific way for the controller to obtain the outdoor temperature, the controller may obtain the outdoor temperature by means of a temperature sensor provided in the air conditioning unit itself, or may obtain the outdoor temperature by means of networking, and this specific obtaining way is not limited. After the outdoor temperature is obtained, step S107 is executed, that is, the controller can determine the value range of the target evaporation temperature according to the outdoor temperature. As a preferred embodiment, the specific determination method is as follows: determining a unique first preset evaporation temperature R according to the outdoor temperature; then determining the first preset evaporation temperature as the left end point of a value range; determining the second preset evaporation temperature as the right end point of the value range; and finally, determining the value range of the target evaporation temperature according to the determined left end point and the determined right end point. It should be noted that, a technician may set a specific value of the second preset evaporating temperature according to the types of the indoor units, and this setting manner is not limited. In addition, it can be understood by those skilled in the art that the execution sequence of steps S101 to S105 and steps S106 to S107 in the preferred embodiment can be adjusted, and the skilled person can set the specific execution sequence according to the actual use requirement, for example, step S106 to step S107 can be executed first, and then step S101 to step S105 can be executed. Such changes in the specific order of execution do not depart from the basic principles of the invention and are intended to be within the scope of the invention.
As a preferable determination, in the case that the air conditioning unit is in the cooling condition, the relationship between the outdoor temperature and the first preset evaporating temperature R is as follows:
| outdoor temperature Tao (Unit:. degree. C.) | First preset evaporating temperature R (unit:. degree. C.) |
| Tao≤20 |
0℃ |
| 20℃＜Tao＜43 |
4℃ |
| Tao≥43 |
6℃ |
In the preferred embodiment, the compressor frequency control method determines the value of the first preset evaporating temperature R through different ranges of the outdoor temperature, so as to determine the value ranges of different target evaporating temperatures, so that the variable frequency compressor can be controlled more accurately, and further the heat exchange efficiency of the multi-split air conditioning unit is effectively improved.
After the value range of the target evaporation temperature is determined, the controller can determine the specific value of the target evaporation temperature according to the determined value range of the target evaporation temperature and the sum of the capacity requirements of all indoor units in the running state; it should be noted that the present invention does not limit the specific determination method, and the skilled person can set the specific determination method according to the actual use requirement.
As a preferred embodiment, when the sum of the capacity requirements is greater than or equal to the first preset value and less than or equal to the second preset value, the value of the target evaporation temperature is set within the determined value range, and the sum of the capacity requirements and the target evaporation temperature are linearly related within the two ranges; that is, when the sum of the capacity requirements is within the range of the first preset value and the second preset value, the value of the target evaporation temperature corresponding to the sum is within the range of the first preset evaporation temperature and the second preset evaporation temperature, and a linear negative correlation relationship is formed between the first preset evaporation temperature and the second preset evaporation temperature, so that a more accurate value is determined in a simplest manner, and an accurate control effect is effectively ensured. It should be noted that a technician may set specific values of the first preset value and the second preset value according to specific conditions of the multi-split air conditioning unit. Furthermore, when the sum of the capacity demands is less than the first preset value, the target evaporation temperature is determined as the second preset evaporation temperature; and when the sum of the capacity requirements is greater than the second preset value, determining the target evaporation temperature as the first preset evaporation temperature.
Based on the determination described in the above preferred embodiment, taking the case where the number of indoor units in operation is three and the nominal capacity of each indoor unit is 1, as a preferred determination, the relationship between the sum of the calculated capacity requirements S-code and the target evaporation temperature ET is shown in fig. 4. Referring next to fig. 4, in the present preferred embodiment, the value of the first preset evaporating temperature R is determined by the table in the above preferred embodiment, the second preset evaporating temperature is set to 12 ℃, the first preset value is set to 1, and the second preset value is set to 42. Based on this, when the sum of the capacity requirements S-code is less than 1, the target evaporation temperature ET is determined to be 12 ℃; when the sum of the capacity demands S-code is greater than or equal to 1 and less than or equal to 42, the target evaporation temperature ET is set between the first preset evaporation temperature R and the second preset evaporation temperature (i.e., 12 ℃), and the sum of the capacity demands S-code is linearly inversely related to the target evaporation temperature ET. After the target evaporation temperature ET is determined, the original target evaporation temperature of the multi-split air conditioning unit is adjusted, so that the controller can control the frequency of the variable frequency compressor according to the determined target evaporation temperature ET.
Referring next to fig. 5, a flowchart illustrating specific steps of a second preferred embodiment of the present invention is shown. As shown in fig. 5, based on the multi-split air conditioning unit in the foregoing embodiment, when the multi-split air conditioning unit is in the heating condition, a second preferred embodiment of the method for controlling the frequency of the compressor of the present invention specifically includes the following steps:
s201: acquiring the set temperature of all indoor units in the running state and the indoor temperature of the environment where the indoor units are located;
s202: calculating the difference value between the indoor temperature and the set temperature;
s203: determining a capacity demand coefficient of the indoor unit according to the difference value of the indoor temperature and the set temperature;
s204: determining the capacity requirement of the indoor unit according to the capacity requirement coefficient and the nominal capacity of the indoor unit;
s205: calculating the sum of the capacity requirements of all the indoor units in the running state;
s206: acquiring outdoor temperature;
s207: determining the value range of the target condensation temperature according to the outdoor temperature;
s208: determining a target condensation temperature according to the sum of the determined value range and the capacity requirement;
s209: and adjusting the frequency of the compressor according to the determined target condensation temperature.
In steps S201 to S204 of the preferred embodiment, the present invention provides a method for determining a capacity requirement of an indoor unit in an operating state, and the method specifically includes: the controller obtains the set temperature of the indoor unit in the running state and the indoor temperature of the environment where the indoor unit is located, the controller can obtain the indoor temperature of the environment where the indoor unit is located through a temperature sensor which is self-configured on the indoor unit, and can also obtain the indoor temperature of the environment where the indoor unit is located through an external temperature sensor, which is not restrictive, and technicians can set the temperature by themselves. The controller can then calculate the difference Δ E between the acquired indoor temperature and the set temperature, which can be done by the controller itself or by other means.
Further, the controller can determine the capacity demand coefficient of the indoor unit according to the difference Δ E calculated in step S202, and as a preferred embodiment, the relationship between the difference Δ E and the capacity demand coefficient of the indoor unit can be determined by a relationship diagram as shown in fig. 6, that is, the capacity demand coefficient k of the indoor unit is set between 0 and 14, and then a specific value of the capacity demand coefficient k is selected according to the magnitude of the difference Δ E between the indoor temperature and the set temperature. As shown in fig. 5, specifically, when the difference Δ E between the indoor temperature and the set temperature is less than-5 ℃, the capacity demand coefficient k is set to 14; when the difference delta E between the indoor temperature and the set temperature is greater than 0 ℃, the capacity demand coefficient k is set to be 0; when the difference value delta E between the indoor temperature and the set temperature is between minus 5 ℃ and 0 ℃ (including minus 5 ℃ and 0 ℃), the capacity demand coefficient k is set between 0 and 14 (including 0 and 14), and the difference value delta E between the indoor temperature and the set temperature and the capacity demand coefficient k are in a linear negative correlation relationship. After the capacity demand coefficient of the indoor unit is determined, the controller can determine the capacity demand of the indoor unit according to the capacity demand coefficient of the indoor unit and the nominal capacity of the indoor unit, and specifically, the product of the capacity demand coefficient of the indoor unit and the nominal capacity of the indoor unit is the capacity demand of the indoor unit. Based on the determination method described in the above preferred embodiment, the controller may determine the capacity requirements of all the indoor units in the operating state one by one through this method, and after the capacity requirements of all the indoor units in the operating state are obtained, step S105 is executed, that is, the controller calculates the sum of the capacity requirements of all the indoor units in the operating state, so as to facilitate subsequent use.
In step S206, the controller can acquire an outdoor temperature. After the outdoor temperature is obtained, step S207 is executed, that is, the controller can determine the value range of the target condensing temperature according to the outdoor temperature. As a preferred embodiment, the specific determination method is as follows: determining a unique first preset condensing temperature R' according to the outdoor temperature; then determining the first preset condensation temperature R' as the right end point of the value range; determining the second preset condensing temperature as the left end point of the value range; and finally, determining the value range of the target condensation temperature according to the determined left end point and the determined right end point. It should be noted that the specific value of the second preset condensing temperature can be set by a technician according to the type of the indoor unit, and this setting manner is not limitative. Moreover, it can be understood by those skilled in the art that the execution sequence of steps S201 to S205 and steps S206 to S207 in the preferred embodiment can be adjusted, and the skilled person can set the specific execution sequence according to the actual use requirement, for example, step S206 to step S207 can be executed first, and then step S201 to step S205 can be executed. Such changes in the specific order of execution do not depart from the basic principles of the invention and are intended to be within the scope of the invention.
As a preferable determination, in the case that the air conditioning unit is in the heating condition, the relationship between the outdoor temperature and the first preset condensing temperature R' is as follows:
| outdoor temperature Tao (Unit:. degree. C.) | First predetermined condensing temperature R' (unit:. degree. C.) |
| Tao≤﹣15 |
44℃ |
| ﹣15℃＜Tao＜15℃ | 48℃ |
| Tao≥15℃ | 54℃ |
In the preferred embodiment, the compressor frequency control method determines the value of the first preset condensing temperature R' according to different ranges of the outdoor temperature, so as to determine the value ranges of different target condensing temperatures, so that the inverter compressor can be controlled more accurately, and the heat exchange efficiency of the multi-split air conditioning unit is further effectively improved.
After the value range of the target condensation temperature is determined, the controller can determine the specific value of the target condensation temperature according to the determined value range of the target condensation temperature and the sum of the capacity requirements of all indoor units in the running state; it should be noted that the present invention does not limit the specific determination method, and the skilled person can set the specific determination method according to the actual use requirement.
As a preferred embodiment, when the sum of the capacity demands is greater than or equal to the third preset value and less than or equal to the fourth preset value, the value of the target condensation temperature is set within the determined value range, and the sum of the capacity demands and the target condensation temperature are linearly related within the two ranges; that is, when the sum of the capacity requirements is within the range of the third preset value and the fourth preset value, the value of the target condensing temperature corresponding to the sum of the capacity requirements is within the range of the first preset condensing temperature and the second preset condensing temperature, and the first preset condensing temperature and the second preset condensing temperature are in a linear positive correlation relationship, so that a more accurate value is determined in a simplest manner, and an accurate control effect is effectively guaranteed. It should be noted that a technician may set specific values of the third preset value and the fourth preset value according to specific conditions of the multi-split air conditioning unit. Furthermore, when the sum of the capacity demands is less than the third preset value, the target condensing temperature is determined as the second preset condensing temperature; when the sum of the capacity demands is greater than the fourth preset value, the target condensing temperature is determined as the first preset condensing temperature.
Based on the determination described in the above preferred embodiment, taking the case where the number of indoor units in operation is three and the nominal capacity of each indoor unit is 1 p as an example, as a preferred determination, the relationship between the sum of the capacity requirements S-code and the target condensing temperature CT is shown in fig. 7. Referring next to fig. 7, in the present preferred embodiment, the value of the first preset condensing temperature R' is determined by the table in the above preferred embodiment, the second preset condensing temperature is set to 36 ℃, the first preset value is set to 1, and the second preset value is set to 42. Based on this, when the sum of the capacity requirements S-code is less than 1, the target condensing temperature CT is determined to be 36 ℃; when the sum of capacity demands S-code is greater than or equal to 1 and less than or equal to 42, the target condensing temperature CT is set between the second preset condensing temperature (i.e., 36 ℃) and the first preset condensing temperature R', and the sum of capacity demands S-code is in a linear positive correlation with the target condensing temperature CT. After the target condensation temperature CT is determined, the original target condensation temperature of the multi-split air conditioning unit is adjusted, so that the controller can control the frequency of the variable frequency compressor according to the determined target condensation temperature CT.
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 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 compressor frequency control method for a multi-split air conditioning unit is characterized in that the multi-split air conditioning unit comprises a plurality of indoor units, and the compressor frequency control method comprises the following steps:
acquiring the capacity requirements of all indoor units in the running state;
calculating the sum of the capacity requirements of all the indoor units in the running state;
determining a target parameter value according to the sum of the capacity requirements;
adjusting the frequency of the compressor according to the determined target parameter value;
when the multi-split air conditioning unit is in a refrigeration working condition, the target parameter value is a target evaporation temperature; and when the multi-split air conditioning unit is in a heating working condition, the target parameter value is a target condensation temperature.
2. The compressor frequency control method according to claim 1, characterized in that the step of "determining a target parameter value from the sum of said capacity demands" comprises in particular:
acquiring outdoor temperature;
determining the value range of a target parameter value according to the outdoor temperature;
and determining the target parameter value according to the value range of the target parameter value and the sum of the capacity requirements.
3. The compressor frequency control method according to claim 2, wherein the step of determining the value range of the target parameter value according to the outdoor temperature when the multi-split air conditioning unit is in the cooling condition specifically comprises:
determining a first preset evaporation temperature according to the outdoor temperature;
determining the first preset evaporation temperature as the left end point of a value range;
determining the second preset evaporation temperature as the right end point of the value range;
and determining the value range of the target evaporation temperature according to the determined left end point and the right end point.
4. The compressor frequency control method according to claim 3, wherein the step of determining the target parameter value based on the sum of the range of the target parameter value and the capacity demand comprises:
and when the sum of the capacity requirements is greater than or equal to a first preset value and less than or equal to a second preset value, the value of the target evaporation temperature is within the value range of the target parameter value, and the sum of the capacity requirements is linearly related to the target evaporation temperature.
5. The compressor frequency control method according to claim 4, wherein the step of determining the target parameter value based on the sum of the range of the target parameter value and the capacity demand further comprises:
when the sum of the capacity requirements is smaller than the first preset value, determining the target evaporation temperature as the second preset evaporation temperature; and/or
And when the sum of the capacity requirements is greater than the second preset value, determining the target evaporation temperature as the first preset evaporation temperature.
6. The compressor frequency control method according to claim 2, wherein the step of determining the value range of the target parameter value according to the outdoor temperature when the multi-split air conditioning unit is in the heating condition specifically comprises:
determining a first preset condensing temperature according to the outdoor temperature;
determining the first preset condensing temperature as the right end point of a value range;
determining the second preset condensing temperature as the left end point of the value range;
and determining the value range of the target condensation temperature according to the determined left end point and the right end point.
7. The compressor frequency control method according to claim 6, wherein the step of determining the target parameter value based on the sum of the range of the target parameter value and the capacity demand comprises:
and when the sum of the capacity demands is greater than or equal to a third preset value and less than or equal to a fourth preset value, the value of the target condensation temperature is within the value range of the target parameter value, and the sum of the capacity demands is linearly related to the target condensation temperature.
8. The compressor frequency control method according to claim 7, wherein the step of determining the target parameter value based on the sum of the range of the target parameter value and the capacity demand further comprises:
when the sum of the capacity demands is less than the third preset value, the target condensing temperature is determined as the second preset condensing temperature; and/or
When the sum of the capacity demands is greater than the fourth preset value, the target condensing temperature is determined as the first preset condensing temperature.
9. The compressor frequency control method according to any one of claims 1 to 8, wherein the step of acquiring the capacity demand of all the indoor units in the operating state specifically includes:
acquiring the set temperature of all indoor units in the running state and the indoor temperature of the environment where the indoor units are located;
calculating a difference value between the indoor temperature and the set temperature;
determining a capacity demand coefficient of the indoor unit according to the difference value between the indoor temperature and the set temperature;
and determining the capacity requirement of the indoor unit according to the capacity requirement coefficient and the nominal capacity of the indoor unit.
10. The compressor frequency control method according to any one of claims 1 to 8, wherein prior to the step of "acquiring capacity demand of all indoor units in operation", the compressor frequency control method further comprises:
acquiring nominal capacity of all indoor units to be operated;
calculating the sum of the nominal capacities of all the indoor units to be operated;
calculating the ratio of the sum of the nominal capacities of all the indoor units to be operated to the nominal capacity of the outdoor unit;
and determining the initial operating frequency of the compressor according to the ratio and the rated initial frequency of the compressor.
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| PCT/CN2021/089764 WO2021223616A1 (en) | 2020-06-23 | 2021-04-26 | Compressor frequency control method for multi-split air-conditioning unit |
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| CN115111825A (en) * | 2022-06-20 | 2022-09-27 | 青岛海信日立空调系统有限公司 | Method and device for determining running frequency of compressor |
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| WO2021223616A1 (en) | 2021-11-11 |
| CN113834175B (en) | 2022-10-28 |
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Effective date of registration: 20230120 Address after: 266101 Haier Industrial Park, 1 Haier Road, Laoshan District, Shandong, Qingdao Patentee after: QINGDAO HAIER AIR CONDITIONER GENERAL Corp.,Ltd. Patentee after: QINGDAO HAIER AIR-CONDITIONING ELECTRONIC Co.,Ltd. Patentee after: Haier Zhijia Co.,Ltd. Address before: 266101 Haier Industrial Park, 1 Haier Road, Laoshan District, Shandong, Qingdao Patentee before: QINGDAO HAIER AIR-CONDITIONING ELECTRONIC Co.,Ltd. Patentee before: Haier Zhijia Co.,Ltd. |