CN113531827B - Variable frequency air conditioner control method and device, electronic equipment and medium - Google Patents
Variable frequency air conditioner control method and device, electronic equipment and medium Download PDFInfo
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- CN113531827B CN113531827B CN202110744689.9A CN202110744689A CN113531827B CN 113531827 B CN113531827 B CN 113531827B CN 202110744689 A CN202110744689 A CN 202110744689A CN 113531827 B CN113531827 B CN 113531827B
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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
- 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
- F24F2140/00—Control inputs relating to system states
- F24F2140/50—Load
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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 application discloses a variable frequency air conditioner control method, a variable frequency air conditioner control device, electronic equipment and a medium. The method comprises the following steps: acquiring a set temperature value of an air conditioner and acquiring a current indoor temperature value; determining the system load rate of the variable frequency air conditioner according to the set temperature value, the current indoor temperature value and a preset deviation threshold value; acquiring a current outdoor temperature value and acquiring information of a target device of the variable frequency air conditioner; confirming the total heat transfer temperature difference according to the current outdoor temperature value, the information of the target device and the system load rate; the refrigerating system of the variable frequency air conditioner is controlled by taking the total heat transfer temperature difference as a target, so that the air conditioning system can be controlled to operate at higher energy efficiency under different load rates and different outdoor temperature values, and the energy-saving operation of the air conditioning system is realized.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device of a variable frequency air conditioner, electronic equipment and a medium.
Background
With the promotion and promotion of a series of informatization projects such as ' internet + ' big data application ', the scale and the quantity of data centers are rapidly developed and become power utilization consumers of an information society. In order to ensure efficient and reliable operation of the data center, heat generated by the servers of the data center during operation needs to be rapidly exhausted.
In order to reduce the energy consumption of the data center and reasonably configure social resources, the refrigeration systems of mechanisms such as the data center need to be optimized, wherein the optimization of the variable frequency air conditioning system needs to be optimized more on the control system, and how to enable the system to operate under the current load with the lowest energy consumption becomes the important point of research.
At present, the energy consumption of partial load of a variable frequency air conditioning system is higher, namely, an energy-saving optimization space still exists under partial load rate.
Disclosure of Invention
The application provides a control method and device of a variable frequency air conditioner, electronic equipment and a medium. The problem that the energy consumption of partial load of the existing variable frequency air conditioning system is high and energy-saving and space-optimizing still exists under the partial load rate can be solved.
In a first aspect, a method for controlling an inverter air conditioner is provided, including:
determining the system load rate of the variable frequency air conditioner according to the set temperature value, the current indoor temperature value and a preset deviation threshold value;
confirming the total heat transfer temperature difference according to the current outdoor temperature value, the information of the target device and the system load rate;
and controlling a refrigerating system of the variable frequency air conditioner by taking the total heat transfer temperature difference as a target.
In a second aspect, a control device for a variable frequency air conditioner is provided, which includes:
the determining module is used for determining the system load rate of the variable frequency air conditioner according to the set temperature value, the current indoor temperature value and a preset deviation threshold value;
the determining module is also used for determining the total heat transfer temperature difference according to the current outdoor temperature value, the information of the target device and the system load rate;
and the control module is used for controlling a refrigerating system of the variable frequency air conditioner by taking the total heat transfer temperature difference as a target.
In a third aspect, an electronic device is provided, comprising a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the steps as in the first aspect and any possible implementation thereof.
In a fourth aspect, a computer storage medium is provided, which stores one or more instructions adapted to be loaded by a processor and to perform the steps of the first aspect and any possible implementation thereof as described above.
The method comprises the steps that the system load rate of the variable frequency air conditioner is determined according to a set temperature value, a current indoor temperature value and a preset deviation threshold value; confirming the total heat transfer temperature difference according to the current outdoor temperature value, the information of the target device and the system load rate; the refrigeration system of the variable frequency air conditioner is controlled by taking the total heat transfer temperature difference as a target, the variable frequency air conditioner system can be controlled to operate at higher energy efficiency under different load rates and different outdoor temperature values, the energy-saving operation of the variable frequency air conditioner system is realized, the excellent dynamic refrigeration target is achieved, and finally the energy consumption is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.
Fig. 1A is a schematic diagram of an inverter air conditioner control system according to an embodiment of the present disclosure;
fig. 1B is a schematic flowchart of a method for controlling an inverter air conditioner according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart of another inverter air conditioner control method according to an embodiment of the present disclosure;
fig. 3 is a schematic view of a data processing flow of an inverter air conditioner control system according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of an inverter air conditioner control device according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The embodiments of the present application are described below with reference to the drawings.
Referring to fig. 1A, fig. 1A is a schematic diagram of an inverter air conditioner control system according to an embodiment of the present disclosure, as shown in fig. 1A, the system includes an inverter compressor 01, an oil separator 02, a condenser 03, a filter 04, a liquid viewing mirror 05, an expansion valve 06, and an evaporator 07. In an embodiment, the inverter air conditioner control method in the embodiment of the present application may be implemented on the basis of a system as shown in fig. 1A. Namely, the application also discloses an inverter air conditioner control system which can execute the method shown in the figure 1B or the figure 2.
Referring to fig. 1B, fig. 1B is a schematic flowchart of a control method of an inverter air conditioner according to an embodiment of the present application. The method can comprise the following steps:
101. and determining the system load rate of the variable frequency air conditioner according to the set temperature value, the current indoor temperature value and the preset deviation threshold value.
The variable frequency air conditioner control method in the embodiment of the application can be applied to a variable frequency air conditioner system, the system can be a machine room variable frequency air conditioner system for a machine room, the system can comprise a variable frequency compressor, an oil separator, a condenser, a filter, a liquid viewing mirror, an expansion valve and an evaporator, and the system can also comprise a main control system of the system, and the main control system is used for regulating and controlling each module.
The set temperature value is a preset target temperature value and can be set in advance by a user. The variable frequency air conditioning system can adjust the indoor temperature by taking the set temperature value as a target, and mainly performs refrigeration and cooling. The variable frequency air conditioning system can acquire an indoor temperature value in real time, for example, an indoor current temperature value can be acquired through any temperature sensor, and the method is not limited here.
When the variable frequency air conditioning system is started to operate, the load rate of the system at the moment can be obtained by setting a temperature value, a current indoor temperature value and a preset deviation threshold value. Specifically, the set temperature value is T, the current indoor temperature value is Tin, a difference (Tin-T) between the set temperature value and the current indoor temperature value can be calculated, and the load factor is determined by comparing the difference (Tin-T) with a preset deviation threshold Δ T according to a defined preset deviation threshold Δ T. For example, T =24, tin =26, Δ T =1.5, (Tin-T) =26-24=2, and greater than 1.5, the current system load rate is determined to be 100%.
102. And confirming the total heat transfer temperature difference according to the current outdoor temperature value, the information of the target device and the system load rate.
The variable frequency air conditioning system may obtain an outdoor temperature value, for example, an outdoor current temperature value may be acquired and fed back by any outdoor temperature sensor, which is not limited herein. The target devices are related to refrigeration and heating of the variable frequency air conditioning system, and can comprise a condenser, an evaporator, an inner fan and an outer fan, and devices needing to refer to running state information can be configured in advance. The master control system may obtain information about each target device, which may be pre-stored in relation to an initial period, and may be used to validate the total heat transfer differential of the system.
The total heat transfer temperature difference can be determined according to the matching conditions of the condenser, the evaporator and the fan, and is a matching rule determined based on initial design. Specifically, the step 102 may include:
acquiring a third mapping relation between a preset outdoor temperature value, a system load rate, running state information of a target device and a total heat transfer temperature difference;
determining the current outdoor temperature value, the information of the target device and the total heat transfer temperature difference corresponding to the system load rate according to the third mapping relation; the target device comprises a condenser, an evaporator, an inner fan and an outer fan.
In the embodiment of the present application, the third mapping relationship, that is, the mapping relationship between the outdoor temperature value, the system load rate, the operation state information of the target device, and the total heat transfer temperature difference may be preset, so that the corresponding total heat transfer temperature difference is determined according to the current outdoor temperature value, the system load rate, and the operation state information of the target device. The operation state information may be different according to different target devices, that is, a plurality of operation parameters representing the target devices may be considered, and a plurality of target devices may be considered, and may be selected and set as needed, which is not limited in the embodiment of the present application.
103. And controlling a refrigerating system of the variable frequency air conditioner by taking the total heat transfer temperature difference as a target.
The difference value of the condensing temperature and the evaporating temperature of the system can be utilized to properly compensate the insufficient indoor and outdoor temperature difference condition, and finally the required total heat transfer temperature difference is achieved to control the refrigeration system, so that the lowest energy consumption operation of the system is realized. Specifically, the step 103 may include controlling four devices, i.e., the inverter compressor, the inner fan, the outer fan, and the expansion valve, that is, one or more of the following steps may be included:
regulating and controlling the rotating speed of the external fan according to the condensation temperature value;
regulating and controlling the rotating speed of the variable frequency compressor according to the target evaporation temperature value;
regulating and controlling an expansion valve according to the current target air suction superheat degree; and the number of the first and second groups,
and regulating and controlling the rotating speed of the inner fan according to the load rate of the system.
Wherein, the above steps are respectively described in detail in the following.
Further, referring to a flow diagram of a control method of an inverter air conditioner shown in fig. 2, as shown in fig. 2, the method is a specific implementation form of the step 103, and may include:
201. and acquiring the current air outlet/return temperature value of the variable frequency air conditioner.
The return air temperature mentioned in the embodiment of the application is the temperature of the return air inlet of the indoor air conditioner, and the outlet air temperature is the temperature of the air supply outlet of the indoor air conditioner. In an embodiment, before step 201, the following steps may be further included: and acquiring a set temperature value and a current indoor temperature value of the variable frequency air conditioner.
202. Acquiring a first mapping relation between a preset air-out/return air temperature value and a target evaporation temperature value, and determining the target evaporation temperature value according to the current air-out/return air temperature value and the first mapping relation.
Different air outlet temperature values have different target evaporation temperature values under the same evaporator and fan conditions. For example, the indoor return air temperature of 24 ℃ corresponds to the target evaporation temperature value of 9 ℃, and similarly, when the return air temperature is 35 ℃, the corresponding target evaporation temperature value is 15 ℃, and the indoor return air temperature can be preconfigured as required, that is, the first mapping relationship is preconfigured. Optionally, the outlet air temperature in the embodiment of the present application may also be the return air temperature.
The first mapping relation refers to a mapping relation between preset outlet/return air temperature values and target evaporation temperature values, and corresponding target evaporation temperature values can be determined according to the current outlet temperature values and the first mapping relation. The rotating speed of the variable-frequency compressor can be controlled according to the target evaporation temperature value. Specifically, the compressor has different evaporation temperatures, such as a return air temperature value of 35 ℃, an evaporation temperature corresponding to 90 revolutions may be 13 ℃, an evaporation temperature corresponding to 85 revolutions is 15 ℃, and a preset operation control rule may be adopted, so that the corresponding rotation speed can be adjusted by setting a target evaporation temperature value, under the condition that the same outlet/return air temperature value is matched with the evaporator at different rotation speeds.
In an embodiment, after determining the target evaporation temperature value according to the current outlet/return air temperature value and the first mapping relationship between the preset outlet/return air temperature value and the evaporation temperature value, the method further includes:
acquiring a preset outlet air/return air temperature value limit value and a preset evaporation temperature value limit value of a compressor;
correcting the target evaporation temperature value according to the air outlet/return air temperature value limit value and the evaporation temperature value limit value of the compressor to obtain a checked target evaporation temperature value; the checked target evaporation temperature value is the minimum value among the outlet air/return air temperature value limit value, the evaporation temperature value limit value of the compressor and the target evaporation temperature value.
The method comprises the following steps that an indoor air outlet/return air temperature value limit value and a preset evaporation temperature value limit value of a compressor can be preset, a target evaporation temperature value Te1 calculated at the moment can be corrected according to the limit values of the indoor air outlet/return air temperature value limit value and the preset evaporation temperature value limit value of the compressor, specifically, the minimum value of the indoor air outlet/return air temperature value limit value and the target evaporation temperature value Te1 can be taken as a checked target evaporation temperature value Te2, and the rotating speed of the variable frequency compressor is controlled according to the target evaporation temperature value Te2 at the moment; the air outlet/return temperature value limit value can also be used for firstly judging whether the current air outlet/return temperature is within a preset temperature threshold range to adjust the target evaporation temperature value.
In an optional implementation manner, after obtaining the current outlet/return air temperature of the inverter air conditioner, the method further includes:
judging whether the current air outlet/return temperature is within a preset temperature threshold range;
if the current air outlet/return temperature is in the preset temperature range, triggering the mapping relation between the current air outlet/return temperature and the preset air outlet/return temperature and the evaporating temperature, and determining a target evaporating temperature value;
if not, acquiring a target air outlet/return temperature closest to the current air outlet/return temperature from the preset temperature threshold range;
and determining the target evaporation temperature value according to the target air outlet/return temperature and the preset mapping relation between the air outlet/return temperature and the evaporation temperature.
Setting a target evaporation temperature value exceeding the limit value can be avoided by the above correction processing to operate the compressor in a steady state.
203. And calculating to obtain a condensation temperature value according to the current outdoor temperature value, the current indoor temperature value and the target evaporation temperature value.
Specifically, according to the current outdoor temperature Tout, the current indoor temperature Tin and the known total heat transfer temperature difference Δ T, the condensation temperature Tc1 can be calculated by the formula Δ T = (Tin-Tout) + (Tc-Te). Wherein Te is the finally determined target evaporation temperature value.
204. And determining the corresponding current target suction superheat degree according to the system load rate and the current outdoor temperature value.
The target suction superheat degree under the current system load rate and the outdoor temperature value can be determined according to a preset matching rule. In general, the matching rules described above comply with the following basic principles: the system load rate is high, and the target superheat degree is low; the outdoor temperature is low, the target superheat degree is high, and specific setting can be carried out according to requirements.
In an alternative embodiment, the determining a current target suction superheat according to the system load factor and the current outdoor temperature value includes:
acquiring a second mapping relation between a preset system load rate, an outdoor temperature value and a suction superheat degree;
and determining the current target suction superheat degree corresponding to the system load rate and the current outdoor temperature value according to the second mapping relation.
The second mapping relationship and the mapping relationship between the system load rate, the outdoor temperature value and the suction superheat degree can be preset, so that the current target suction superheat degree corresponding to the current system load rate and the outdoor temperature value can be matched. In an optional implementation manner, the following may be specifically set:
if the outdoor temperature value is more than 15 ℃, the corresponding target suction superheat degree is variable from 4 to 7 degrees, when the load rate is 100%, the target suction superheat degree is 4 ℃, and when the load rate is 50%, the target suction superheat degree is 6 degrees; the outdoor temperature value is lower than 15 ℃, the corresponding target suction superheat degree is variable from 8 ℃ to 11 ℃, and various settings can be provided, which is not limited by the embodiment of the application.
205. Regulating and controlling an expansion valve according to the current target air suction superheat degree; regulating and controlling the rotating speed of the external fan according to the condensation temperature value; regulating and controlling the rotating speed of the variable frequency compressor according to the target evaporation temperature value; regulating and controlling an expansion valve according to the current target air suction superheat degree; and regulating and controlling the rotating speed of the inner fan according to the load rate of the system.
It is understood that, in order to achieve the purpose of the present invention, within the spirit of the present invention, according to actual needs, the present step 205 may be to perform at least one of the following, i.e. to perform one or more of the following: regulating and controlling an expansion valve according to the current target air suction superheat degree; regulating and controlling the rotating speed of the external fan according to the condensation temperature value; regulating and controlling the rotating speed of the variable frequency compressor according to the target evaporation temperature value; regulating and controlling an expansion valve according to the current target air suction superheat degree; and regulating and controlling the rotating speed of the inner fan according to the load rate of the system. Accordingly, steps 201-204 may be performed as desired, with some steps omitted. For example, in an embodiment, if "regulating the expansion valve according to the current target suction superheat degree" is not performed, the relevant steps of obtaining or determining the "current target suction superheat degree" related to regulating the expansion valve, such as step 204, or step 204 and the relevant steps, etc., may not be included. For another example, in an embodiment, if "regulating the outer fan speed according to the above-mentioned condensation temperature value" is not performed, the related step of obtaining or determining the "condensation temperature value" related to the outer fan speed, such as step 203, or step 203 and the related step, may not be included.
After the target evaporation temperature value is obtained, the rotating speed of the variable frequency compressor can be regulated and controlled through the target evaporation temperature value, and details are not repeated here. The control method of the variable frequency air conditioner in the embodiment of the application can realize that the system compressor runs at a higher evaporation temperature as much as possible, and realize energy conservation of the compressor. It is understood that, within the spirit of the present invention, the specific execution sequence of the steps 201-204 can be modified according to actual needs, and as described in the above paragraph, in some embodiments, one or more of the steps 201-204 can be omitted or not executed.
The expansion valve in the embodiment of the present application is an important self-controlled component of the refrigeration system, and is generally installed between the liquid storage cylinder and the evaporator. The temperature change of an air box head (a temperature sensing bulb) is used as a signal, the opening degree of a valve is adjusted, the flow rate of the refrigerant is changed, the refrigerant with medium temperature and high pressure is throttled to be low-temperature and low-pressure wet steam, and then the refrigerant absorbs heat in an evaporator to achieve the refrigeration effect.
The superheat is referred to as the temperature difference between the evaporation temperature and the evaporator outlet temperature in the system. The expansion valve is the temperature difference corresponding to the temperature of the temperature sensing bulb and the pressure below the diaphragm. In the case where the target intake air superheat is determined, the opening degree of the expansion valve may be controlled in accordance with the set target intake air superheat. The superheat degree is ensured to be in a proper range, the refrigerating system can reach the maximum refrigerating capacity, and the wet stroke can not be caused.
In the embodiment of the application, the system expansion valve is controlled by changing superheat degree, and different target suction superheat degrees are adopted for different load rates and different outdoor temperature values, so that safe, stable, reliable and energy-saving operation of the system is realized.
In an embodiment, the adjusting and controlling the rotation speed of the external fan according to the condensation temperature value includes:
converting the condensation temperature value into a condensation pressure value;
and determining the target outer fan rotating speed corresponding to the condensation pressure value, and regulating and controlling the outer fan to work to the target outer fan rotating speed.
The condensing temperature and the condensing pressure are refrigerant characteristics, that is, the condensing temperature corresponds to a saturation pressure. The obtained condensation temperature value can be converted into a condensation pressure value, and the outer fan is regulated and controlled to work to the target outer fan rotating speed through the condensation pressure value.
Optionally, after converting the condensation temperature value into a condensation pressure value, the method further includes:
and correcting the condensation pressure value according to the compression ratio limit value of the compressor and the outdoor temperature value, and determining the checked condensation pressure value.
The corresponding Tc limit value can be calculated through the limit value of the compression ratio (pressure difference) of the compressor, and Tc2 can be obtained through comprehensive checking according to the current outdoor temperature value. For example, the compression ratio limit value of the compressor is 1.2, when the target evaporation temperature Te2 is determined, the corresponding pressure value Pe2 is obtained, and Pc/Pe2 needs to be greater than the compression ratio limit value 1.2 of the compressor. For example, te2=15 ℃ and Pe2=1.15MPa, pc is required to be >
1.15*1.2＝1.38Mpa。
And converting the condensation temperature Tc2 into a condensation pressure value Pc, and feeding back the condensation pressure value Pc to the outdoor fan through the control system to control and adjust the rotating speed of the outdoor fan. Once Tc2 is calculated, pc is converted, and then the outer fan rotation speed is controlled at the value of Pc according to Pc.
In an optional implementation, the above regulating the inner fan speed according to the system load factor includes:
acquiring the lowest rotating speed of a preset inner fan;
and adjusting the rotating speed of the inner fan according to the system load rate to enable the rotating speed of the inner fan to be the target inner fan rotating speed, wherein the target inner fan rotating speed is higher than the preset minimum rotating speed of the inner fan.
The rotating speed of the indoor fan of the system can be controlled through the load factor, but the rotating speed of the fan is still limited by the lowest rotating speed of the inner fan at the moment, namely the rotating speed of the fan is reduced and cannot be lower than the lowest rotating speed of the preset inner fan, so that the stable operation of devices is ensured.
The existing variable frequency air conditioner adopts fixed evaporation temperature and suction superheat degree control, so that the energy consumption of partial load of the system is higher, and an energy-saving optimization space still exists under the partial load rate; the application provides a set of new control thinking according to the compensation temperature difference heat exchange principle, can realize that the variable frequency air conditioning system operates under higher energy efficiency under different load factors and different outdoor environment temperatures, realizes the energy-saving operation of the variable frequency air conditioning system, is suitable for various refrigeration scenes, such as machine room environments of data centers and the like, realizes an excellent dynamic refrigeration target, and finally brings about energy consumption reduction.
Referring to fig. 3, fig. 3 is a schematic diagram of a data processing flow of the variable frequency air conditioner control system provided by the present application. As shown in fig. 3, the data processing flow of the inverter air conditioner control method in the embodiment of the present application is shown more clearly, specifically, the method provided in the embodiment of the present application firstly determines the total heat transfer temperature difference, and firstly determines the target evaporation temperature value (Te) with the total heat transfer temperature difference as the target to realize the control of the compressor; and then, calculating and checking the condensation temperature value (Tc) by using the above-mentioned total heat transfer temperature difference formula to realize the control of the external fan, and confirming the regulation and control of the opening of the expansion valve and the rotating speed of the internal fan according to the load rate, correction and limitation of the system. After the parameters are calculated and determined, the parameters can be fed back to the corresponding device by the main control unit to perform regulation and control. The steps involved may refer to the detailed description in the foregoing embodiments, and are not repeated here.
To more clearly illustrate the above method, one embodiment provided herein is as follows:
for example, at this time, the outdoor temperature Tout is 35 ℃, the indoor temperature Tin is 35 ℃, the current system load rate is calculated by setting the temperature T, for example, the load rate is 100%, the total temperature difference Δ T required by the system is obtained by calculating, by the main control system, the total temperature difference Δ T required by the system under 100% load and the current matching conditions of the condenser, the evaporator and the fan of the system, and the related specific calculation method is not described again. For example, Δ T is calculated to be 30 ℃;
at the moment, the target evaporation temperature Te1 is obtained to be 15 ℃ according to the indoor return air temperature of 35 ℃, and the calculated result is checked through the compressor limiting value (upper limit value) and the air outlet temperature limiting value (upper limit value), for example, the general compressor Te limiting value is 26 ℃, the air outlet temperature upper limit value is 24-26 ℃, and the limiting value for the evaporation temperature is 20 ℃; because the calculated results Te do not exceed the limit value, the finally checked Te2 is 15 ℃, the rotating speed of the compressor is controlled through the target evaporation temperature value Te2=15 ℃, and the operating rotating speed of the compressor can reach the target evaporation temperature value Te2. Different load rates may correspond to different target evaporation temperature values, such as 100% load of 15 ℃ and 25% load of 18-19 ℃.
Calculating Tout =35, tin =35, te =15 according to the formula of DeltaT = (Tc-Te) + (Tin-Tout), so that Tc =45 ℃, and because Tc is 45 ℃ and does not exceed the Tc limit value, the rotating speed of the outer fan is 100% at the time;
at the moment, the expansion valve sets a target suction superheat degree according to the load factor and the outdoor temperature value, and performs opening degree regulation control on the expansion valve; different load rates and different outdoor temperature values correspond to different target suction superheat degrees, for example, the outdoor temperature value is more than 15 ℃, the target suction superheat degree is variable from 4 to 7 ℃, and when the load rate is 100%, the target suction superheat degree is 4 ℃, and when the load rate is 50%, the target suction superheat degree is 6 ℃; when the outdoor temperature value is lower than 15 ℃, the target suction superheat degree is variable between 8 and 11 ℃, and the embodiment of the application does not limit the target suction superheat degree.
The rotating speed of the indoor fan is controlled according to the load factor and the air outlet/return temperature, for example, the air outlet temperature is controlled to be generally 20-24 ℃, if the air outlet temperature is kept within the range, the rotating speed of the fan is reduced if the air outlet temperature exceeds the range, and in the process of reducing the rotating speed of the fan, the rotating speed of the fan does not exceed the minimum rotating speed limit of the inner fan at the moment.
If the system demand load rate is not 100% but 75%, the target evaporation temperature value Te1 is calculated to be 16 degrees according to the total temperature difference value delta T under the main control 75% load rate, for example, 28 ℃, and the target evaporation temperature value Te1 is controlled to be 16 degrees because the target evaporation temperature value Te1 is within the limit range, so that the compressor is controlled to rotate at the moment to achieve the target evaporation temperature value of 16 ℃, and further the operation of the compressor at higher evaporation temperature is achieved. The energy efficiency of the system can be improved by more than 3% when the evaporation temperature of the compressor is improved by 1 degree, so that the efficient operation of the variable frequency air conditioning system is realized.
If the outdoor temperature value is not changed, namely Tc is 44 ℃, the system is operated at a lower condensation temperature, so that more efficient energy saving is realized, and meanwhile, under the condition of 75% load rate, the target suction superheat degree of the expansion valve is 6 ℃, so that the opening degree of the expansion valve can be controlled to realize the target suction superheat degree.
In the embodiment of the application, the refrigerating system is controlled by utilizing a heat pipe efficient temperature difference heat transfer mechanism, after an evaporator and a condenser of the system are matched, tc-Te is utilized to properly compensate for the situation of insufficient indoor and outdoor Tin-Tout, and finally the required total heat transfer temperature difference is achieved to control the refrigerating system, so that the lowest energy consumption operation of the system is realized. In addition, the data center is not always under the 100% load working condition, so that the system can be operated at a higher evaporation temperature under the condition that the air outlet temperature is met and the safe operation of the data center is guaranteed under the partial load rate, and the energy conservation of the system is realized. And the system expansion valve adopts variable suction superheat degree control, and different target suction superheat degrees are adopted for different load rates and different outdoor temperature values, so that safe, stable, reliable and energy-saving operation of the system is realized.
Based on the description of the embodiment of the control method of the variable frequency air conditioner, the embodiment of the application also discloses a control device of the variable frequency air conditioner. As shown in fig. 4, the inverter air conditioner control device 400 includes:
the determining module 410 is configured to determine a system load rate of the inverter air conditioner according to a set temperature value, a current indoor temperature value, and a preset deviation threshold;
the determining module 410 is further configured to determine a total heat transfer temperature difference according to the current outdoor temperature value, the information of the target device, and the system load rate;
and the control module 420 is used for controlling the refrigerating system of the variable frequency air conditioner by taking the total heat transfer temperature difference as a target.
Optionally, the control module 420 is specifically configured to execute one or more of the following steps:
regulating and controlling the rotating speed of the external fan according to the condensation temperature value;
regulating and controlling the rotating speed of the variable frequency compressor according to the target evaporation temperature value;
regulating and controlling an expansion valve according to the current target air suction superheat degree; and the number of the first and second groups,
and regulating and controlling the rotating speed of the inner fan according to the load rate of the system.
Optionally, the inverter air conditioner control device 400 further includes an obtaining module 430, configured to:
acquiring the set temperature value and the current indoor temperature value of the variable frequency air conditioner;
acquiring a current air outlet/return temperature value of the variable frequency air conditioner;
acquiring a first mapping relation between a preset air outlet/return temperature value and a target evaporation temperature value;
the determining module 410 is further configured to:
determining the target evaporation temperature value according to the current air outlet/return temperature value and the first mapping relation;
calculating to obtain the condensation temperature value according to the current outdoor temperature value, the current indoor temperature value and the target evaporation temperature value;
and determining the corresponding current target suction superheat degree according to the system load rate and the current outdoor temperature value.
Optionally, the determining module 410 is further configured to:
converting the condensation temperature value into a condensation pressure value;
determining the target outer fan rotating speed corresponding to the condensation pressure value;
the control module 420 is configured to regulate the operation of the outer fan to the target outer fan rotation speed.
Optionally, the determining module 410 is further configured to:
and correcting the condensation pressure value according to the compression ratio limit value of the compressor and the outdoor temperature value, and determining the checked condensation pressure value.
Optionally, the obtaining module 430 is further configured to:
after the target evaporation temperature value is determined according to the current air outlet/return temperature value and the first mapping relation between the preset air outlet/return temperature value and the evaporation temperature value, a preset air outlet/return temperature value limit value and a preset evaporation temperature value limit value of the compressor are obtained;
the determining module 420 is further configured to correct the target evaporation temperature value according to the outlet/return air temperature value limit value and the evaporation temperature value limit value of the compressor to obtain a checked target evaporation temperature value, where the checked target evaporation temperature value is a minimum value among the outlet/return air temperature value limit value, the evaporation temperature value limit value of the compressor, and the target evaporation temperature value.
Optionally, the determining module 410 is specifically configured to:
acquiring a second mapping relation between a preset system load rate, an outdoor temperature value and a suction superheat degree;
and determining the current target suction superheat degree corresponding to the system load rate and the current outdoor temperature value according to the second mapping relation.
Optionally, the control module 420 is specifically configured to:
acquiring the lowest rotating speed of a preset inner fan;
and adjusting the rotating speed of the inner fan according to the system load rate to enable the rotating speed of the inner fan to be a target inner fan rotating speed, wherein the target inner fan rotating speed is higher than the preset minimum inner fan rotating speed.
Optionally, the determining module 420 is further specifically configured to:
acquiring a third mapping relation between a preset outdoor temperature value, a system load rate, running state information of a target device and a total heat transfer temperature difference;
determining the current outdoor temperature value, the information of the target device and the total heat transfer temperature difference corresponding to the system load rate according to the third mapping relation; the target device comprises a condenser, an evaporator, an inner fan and an outer fan.
According to an embodiment of the present application, the inverter air conditioner control device 400 may perform the steps in the method embodiments shown in fig. 1B or fig. 2, which are not described herein again.
Based on the description of the method embodiment and the device embodiment, the embodiment of the application further provides an electronic device, and the electronic device can be a variable frequency air conditioner. As shown in fig. 5, which is a schematic structural diagram of an electronic device provided in the present application, the electronic device 500 may include a processor 501, an input/output device 502, a memory 503, and a computer storage medium. Wherein the various component units within the electronic device may be connected by a bus 504 or otherwise.
A computer storage medium may be stored in the memory 503 of the electronic device 500 for storing a computer program comprising program instructions, and the processor 501 for executing the program instructions stored by the computer storage medium. A processor (or CPU) is a computing core and a control core of an electronic device, and is adapted to implement one or more instructions, and in particular, is adapted to load and execute the one or more instructions so as to implement a corresponding method flow or a corresponding function; in one embodiment, the processor 501 described above in this embodiment of the present application may be configured to perform a series of processes, including the steps involved in the method shown in fig. 1B or fig. 2.
An embodiment of the present application further provides a computer storage medium (Memory), which is a Memory device in an electronic device and is used to store programs and data. It is understood that the computer storage medium herein may include both a built-in storage medium in the electronic device and, of course, an extended storage medium supported by the electronic device. Computer storage media provide storage space that stores an operating system for an electronic device. Also stored in the memory space are one or more instructions, which may be one or more computer programs (including program code), suitable for loading and execution by the processor. The computer storage medium may be a high-speed RAM memory, or may be a non-volatile memory (non-volatile memory), such as at least one disk memory; and optionally at least one computer storage medium located remotely from the processor.
In one embodiment, one or more instructions stored in a computer storage medium may be loaded and executed by a processor to perform the corresponding steps in the above embodiments; in a specific implementation, one or more instructions in the computer storage medium may be loaded by the processor and perform the steps involved in the method shown in fig. 1B or fig. 2, which are not described herein again.
It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described apparatuses and modules may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the division of the module is only one logical division, and other divisions may be possible in actual implementation, for example, a plurality of modules or components may be combined or integrated into another system, or some features may be omitted, or not performed. The shown or discussed mutual coupling, direct coupling or communication connection may be an indirect coupling or communication connection of devices or modules through some interfaces, and may be in an electrical, mechanical or other form.
Modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the present application are wholly or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on or transmitted over a computer-readable storage medium. The computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)), or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more of the available media. The usable medium may be a read-only memory (ROM), or a Random Access Memory (RAM), or a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape, a magnetic disk, or an optical medium, such as a Digital Versatile Disk (DVD), or a semiconductor medium, such as a Solid State Disk (SSD).
Claims (8)
1. A control method of a variable frequency air conditioner is characterized by comprising the following steps:
according to the set temperature value, the current indoor temperature value and the preset deviation threshold value, the system load rate of the variable frequency air conditioner is determined, and the method comprises the following steps: calculating a difference value between the set temperature value and the current indoor temperature value, and comparing the difference value with the preset deviation threshold value to determine the system load rate;
confirming the total heat transfer temperature difference according to the current outdoor temperature value, the information of the target device and the system load rate, wherein the confirming step comprises the following steps: acquiring a third mapping relation between a preset outdoor temperature value, a system load rate, running state information of a target device and a total heat transfer temperature difference; determining the current outdoor temperature value, the information of the target device and the total heat transfer temperature difference delta T corresponding to the system load rate according to the third mapping relation; the target device comprises a condenser, an evaporator, an inner fan and an outer fan;
acquiring the set temperature value and the current indoor temperature value of the variable frequency air conditioner; acquiring a current air outlet/return temperature value of the variable frequency air conditioner; acquiring a first mapping relation between a preset air outlet/return temperature value and a target evaporation temperature value; determining the target evaporation temperature value according to the current air outlet/return temperature value and the first mapping relation; calculating to obtain a condensation temperature value according to the current outdoor temperature value, the current indoor temperature value, the target evaporation temperature value and the total heat transfer temperature difference delta T; determining a corresponding current target suction superheat degree according to the system load rate and the current outdoor temperature value;
calculating to obtain a condensation temperature value according to the current outdoor temperature value, the current indoor temperature value, the target evaporation temperature value and the total heat transfer temperature difference delta T, wherein the method comprises the following steps: calculating the condensation temperature value Tc according to the current outdoor temperature value Tout, the current indoor temperature value Tin and the total heat transfer temperature difference Delta T by a formula Delta T = (Tin-Tout) + (Tc-Te), wherein Te is the finally determined target evaporation temperature value;
controlling a refrigerating system of the variable frequency air conditioner by taking the total heat transfer temperature difference as a target;
the control of the refrigerating system of the variable frequency air conditioner with the aim of achieving the total heat transfer temperature difference delta T comprises one or more of the following steps: regulating and controlling the rotating speed of the outer fan according to the condensation temperature value; regulating and controlling the rotating speed of the variable frequency compressor according to the target evaporation temperature value; regulating and controlling an expansion valve according to the current target air suction superheat degree; and regulating and controlling the rotating speed of the inner fan according to the load rate of the system.
2. The method for controlling the inverter air conditioner according to claim 1, wherein the controlling the rotating speed of the external fan according to the condensation temperature value comprises:
converting the condensation temperature value into a condensation pressure value;
and determining the rotating speed of the target outer fan corresponding to the condensation pressure value, and regulating and controlling the outer fan to work to the rotating speed of the target outer fan.
3. The inverter air conditioner control method according to claim 2, wherein after converting the condensation temperature value into a condensation pressure value, the method further comprises:
and correcting the condensation pressure value according to the compression ratio limit value of the compressor and the outdoor temperature value, and determining the checked condensation pressure value.
4. The method for controlling the inverter air conditioner according to claim 1, wherein after determining a target evaporation temperature value according to the current outlet/return air temperature value and a first mapping relationship between preset outlet/return air temperature values and evaporation temperature values, the method further comprises:
acquiring a preset outlet air/return air temperature value limit value and a preset evaporation temperature value limit value of a compressor;
and correcting the target evaporation temperature value according to the outlet/return air temperature value limit value and the evaporation temperature value limit value of the compressor to obtain a checked target evaporation temperature value, wherein the checked target evaporation temperature value is the minimum value of the outlet/return air temperature value limit value, the evaporation temperature value limit value of the compressor and the target evaporation temperature value.
5. The inverter air conditioner control method of claim 4, wherein the determining a corresponding current target suction superheat degree according to the system load factor and the current outdoor temperature value comprises:
acquiring a second mapping relation between a preset system load rate, an outdoor temperature value and a suction superheat degree;
and determining the current target suction superheat degree corresponding to the system load rate and the current outdoor temperature value according to the second mapping relation.
6. The method for controlling the inverter air conditioner according to claim 1, wherein the controlling the rotation speed of the internal fan according to the system load factor comprises:
acquiring the lowest rotating speed of a preset inner fan;
and adjusting the rotating speed of the inner fan according to the system load rate to enable the rotating speed of the inner fan to be the target inner fan rotating speed, wherein the target inner fan rotating speed is higher than the preset minimum rotating speed of the inner fan.
7. An electronic device, comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the steps of the inverter air conditioner control method according to any one of claims 1 to 6.
8. A computer-readable storage medium, characterized in that a computer program is stored which, when executed by a processor, causes the processor to perform the steps of the inverter air conditioner control method according to any one of claims 1 to 6.
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| JPH05240493A (en) * | 1992-02-28 | 1993-09-17 | Toshiba Corp | Air conditioner |
| JP3187198B2 (en) * | 1993-01-14 | 2001-07-11 | 東芝キヤリア株式会社 | Air conditioner |
| JP6647317B2 (en) * | 2017-05-17 | 2020-02-14 | 三菱電機株式会社 | Air conditioner control device and air conditioner system |
| CN108088012A (en) * | 2018-01-16 | 2018-05-29 | 克莱门特捷联制冷设备(上海)有限公司 | A kind of heat pipe combined type computer-room air conditioning system of frequency conversion and its control method |
| CN207849623U (en) * | 2018-01-16 | 2018-09-11 | 克莱门特捷联制冷设备(上海)有限公司 | A kind of heat pipe combined type computer-room air conditioning system of frequency conversion |
| CN109357374B (en) * | 2018-10-25 | 2020-12-11 | 宁波奥克斯电气股份有限公司 | Heating control method and device and multi-split air conditioning system |
| CN111023429B (en) * | 2019-12-27 | 2022-06-14 | 宁波奥克斯电气股份有限公司 | Control method and system and air conditioner |
| CN111023424B (en) * | 2019-12-27 | 2021-09-14 | 宁波奥克斯电气股份有限公司 | Control method and system and air conditioner |
| CN111998500B (en) * | 2020-09-03 | 2021-10-12 | 宁波奥克斯电气股份有限公司 | Control method and device for outdoor fan of air conditioner refrigeration and air conditioner |
| CN112344511A (en) * | 2020-10-23 | 2021-02-09 | 烽火通信科技股份有限公司 | Control method, device and system suitable for machine room air conditioner refrigerant flow |
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