CN114183885A - Multi-connected air conditioning unit and control method thereof - Google Patents

Multi-connected air conditioning unit and control method thereof Download PDF

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CN114183885A
CN114183885A CN202111537459.1A CN202111537459A CN114183885A CN 114183885 A CN114183885 A CN 114183885A CN 202111537459 A CN202111537459 A CN 202111537459A CN 114183885 A CN114183885 A CN 114183885A
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compressors
compressor
started
room temperature
starting
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CN114183885B (en
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何思雨
郑神安
杨和澄
张鸿宙
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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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
    • F24F11/46—Improving electric energy efficiency or saving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
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  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a multi-connected air conditioning unit and a control method thereof, wherein the control method comprises the following steps: calculating indoor demand load Q before starting upNeed to(ii) a Determining the starting sequence of all compressors in the air conditioning unit; according to QNeed toDetermining the starting number of the compressors according to the capacity of each compressor; and after the starting number of the compressors is determined and the compressors are started, the starting number of the compressors is adjusted according to the started compressors and the running states of the internal machines of the started air conditioner. The invention can calculate the indoor demand load according to the user target before starting, reasonably matches the starting number of the compressors to ensure that the user target is quickly reached, and can start when startingAnd then the number of the compressors is adjusted according to the actual room temperature and the target room temperature of the started air conditioner indoor unit so as to realize low-frequency operation of the compressors and achieve high efficiency and energy conservation.

Description

Multi-connected air conditioning unit and control method thereof
Technical Field
The invention relates to the technical field of air conditioning units, in particular to a multi-connected air conditioning unit and a control method thereof.
Background
The multi-connected air conditioner set is called multi-connected air conditioner for short, and is a refrigerating circulation system formed by connecting one or several outdoor machines with several indoor machines with same or different types and capacities, and can directly provide treated air for one or several regions. In the prior art, a large number of control schemes provided for multi-split air conditioners appear, and by taking a disclosed fixed-frequency multi-split air conditioner unit as an example, the use requirements of indoor units of different types can be met only by using one indoor unit, the flow of a refrigerant can be effectively controlled, and the operation conversion of a single outdoor unit to a plurality of indoor units and the effective matching of system loads are realized. However, the multi-split air conditioner has long startup time, cannot adjust the startup quantity according to actual indoor requirements, and has high energy consumption and low efficiency.
Therefore, how to design a control method capable of determining the boot amount according to the indoor demand load is an urgent technical problem to be solved in the industry.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a multi-connected air conditioning unit and a control method thereof.
The technical scheme adopted by the invention is that a control method for designing a multi-connected air conditioning unit comprises the following steps:
calculating indoor demand load Q before starting upNeed to；
Determining the starting sequence of all compressors in the air conditioning unit;
according to QNeed toAnd the capacity of each compressor determines the number of compressors to start.
Further, after the starting number of the compressors is determined and the compressors are started, the starting number of the compressors is adjusted according to the started compressors and the running states of the started air conditioner internal units.
Further, the indoor demand load QNeed toThe calculation method is as follows: qNeed toSigma-start-up fresh air indoor unit rated capacity Ac1Plus sigma, the rated capacity Ac of the air conditioner indoor unit is started;
in the cooling mode, Ac＝[(TActual room temperature-7)×1.5+100+0.9×(TEnvironment(s)-35)]/100，Ac1＝[(4*TReturn air-60)/100；
In the heating mode, Ac＝[(20-TActual room temperature)×5+100+1.1×(7-TEnvironment(s))]/100，Ac1＝[(86-3.6*TReturn air)/100；
Wherein A iscThe value range is 50% -150%, Ac1Value range of 50% -150%, TActual room temperatureActual room temperature, T, for starting the air conditioner indoor unitEnvironment(s)For starting the outdoor ambient temperature, T, of the air-conditioning indoor unitReturn airThe actual return air temperature of the fresh air indoor unit is started.
In one embodiment, determining the starting sequence of all the compressors in the air conditioning unit comprises: before starting the compressor, the accumulated running time of each compressor is obtained, the compressors are reordered and numbered according to the length of the accumulated running time, the compressor with short accumulated running time is started preferentially, and the number of the compressor is gradually increased according to the starting sequence.
Further, according to QNeed toAnd determining the number of compressors to start up for each compressor capacity includes:
starting from n equal to 1, calculate
Figure BDA0003412930360000021
Judging whether the calculation result is greater than 0;
if yes, adding 1 to n, then assigning to n, and returning to calculation
Figure BDA0003412930360000022
A step (2);
if not, determining to start the compressors from No. 1 to No. n;
wherein the number of the compressor is a continuous positive integer from No. 1, Qi#The capacity of the compressor No. i.
Further, adjusting the starting number of the compressors according to the running states of the started compressors and the started air conditioner internal unit comprises:
if all started compressors reach the set maximum frequency and meet the set duration, the average room temperature difference of all started air conditioner internal units is determined
Figure BDA0003412930360000023
And average room temperature differential acceleration aAverage room temperatureAdjusting the starting number;
when in use
Figure BDA0003412930360000024
And a isAverage room temperature＜ΔTtIncreasing the starting requirement of a compressor;
when in use
Figure BDA0003412930360000025
And a isAverage room temperature>ΔTtWhen the pressure is higher than epsilon, the starting requirement of one compressor is reduced;
in the cooling mode of the air conditioner, the air conditioner is,
Figure BDA0003412930360000026
Figure BDA0003412930360000027
in the heating mode, the heating device is arranged in the heating chamber,
Figure BDA0003412930360000028
Figure BDA0003412930360000029
wherein q isiIs the capacity, T, of the air conditioner indoor unit started up No. ii current indoor temperatureIs the actual room temperature T of the No. i started air conditioner internal uniti set valueIs the target room temperature of the air conditioner indoor unit started up in the ith number,
Figure BDA00034129303600000210
the calculated average room temperature for the nth sensing period,
Figure BDA0003412930360000031
the average room temperature calculated for the (n + 1) th detection period, and A is the interval time from the (n) th detection period to the (n + 1) th detection period.
Wherein, Delta TtFor setting the fluctuation of the cooling temperature or the heating temperature, epsilon is a set margin, qiIs the capacity, T, of the air conditioner indoor unit started up No. ii current indoor temperatureIs the actual room temperature T of the No. i started air conditioner internal uniti set valueThe target room temperature of the No. i started air conditioner internal unit is obtained, n is the number of the started air conditioner internal units, and delta t is set interval time.
Further, when the starting requirement of one compressor is increased, one compressor with the shortest accumulated running time is selected from the compressors except the starting number of the compressors to start; when the starting requirement of one compressor is reduced, one compressor with the longest accumulated running time is selected to be closed in the starting number of the compressors.
Further, when the capacity of the started air conditioner indoor unit cannot be identified, the capacity value of the started air conditioner indoor unit is 1.
Further, when the front compressor and the rear compressor are started in sequence, the latter compressor waits for the initialization of the former compressor to be completed and then is started; when the front compressor and the rear compressor are sequentially shut down, the latter compressor waits for the set delay time and then is shut down after the former compressor is shut down.
The invention also provides a multi-split air conditioning unit, which comprises: the outdoor unit is provided with more than two compressors, and the control module executes the control method.
Wherein, indoor set includes: an air conditioner indoor unit for adjusting the room temperature and a fresh air indoor unit for purifying the room air.
Compared with the prior art, the invention has the following beneficial effects:
1. before starting, the indoor demand load is calculated according to the user target, and the starting number of the compressors is reasonably matched so as to ensure that the user target is quickly reached;
2. after the air conditioner is started, the number of the compressors is adjusted according to the actual room temperature and the target room temperature of the air conditioner internal unit which is started, so that the low-frequency operation of the compressors is realized, and the high efficiency and the energy conservation are realized.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a schematic flow chart of a control method according to the present invention;
FIG. 2 is a schematic view of a process for determining the number of compressors to be started before starting the compressor in accordance with the present invention;
FIG. 3 is a schematic view illustrating a process of adjusting the number of compressors started after starting the compressor according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The principle of the present invention will be described in detail with reference to the following examples.
As shown in fig. 1, the control method provided by the present invention is suitable for a multi-connected air conditioning unit, which may be a water multi-connected air conditioning unit, etc., where the multi-connected air conditioning unit includes a control module, an outdoor unit and a plurality of indoor units connected to the outdoor unit, the outdoor unit has more than two variable frequency compressors, the indoor units include an air conditioning indoor unit and a fresh air indoor unit, the air conditioning indoor unit is generally a fan coil unit and is used for adjusting the temperature of a room where the air conditioning indoor unit is located, and the fresh air indoor unit is a fresh air unit and is used for promoting the flow of air inside and outside the room and purifying the air in the room. The working states of the outdoor unit and the indoor unit are both regulated and controlled by the control module, and the control method executed by the control module is described in detail below.
As shown in fig. 1, the control method includes at least four steps.
Step 1, calculating indoor demand load Q before starting upNeed to；
Indoor demand load QNeed toThe method is based on the target calculation set by the user, and the calculation mode is as follows: qNeed toRated capacity Ac of sigma-start fresh air indoor unit1Plus sigma, the rated capacity Ac of the air conditioner indoor unit is started;
in the cooling mode, Ac＝[(TActual room temperature-7)×1.5+100+0.9×(TEnvironment(s)-35)]/100，Ac1＝[(4*TReturn air-60)/100；
In the heating mode, Ac＝[(20-TActual room temperature)×5+100+1.1×(7-TEnvironment(s))]/100，Ac1＝[(86-3.6*TReturn air)/100；
Ac、Ac1The calculation formula is a general formula obtained by a large amount of experimental data statistics in advance, TActual room temperatureActual room temperature, T, for starting the air conditioner indoor unitEnvironment(s)For starting the outdoor ambient temperature, T, of the air-conditioning indoor unitReturn airThe control module respectively recognizes the air conditioner internal unit to be started and the fresh air internal unit to be started as the starting air conditioner internal unit and the starting fresh air internal unit after receiving the starting instruction after the user inputs the starting instruction to the control module, and obtains relevant parameters, T, of each starting air conditioner internal unit and each starting fresh air internal unitActual room temperature、TEnvironment(s)、TReturn airEtc. calculating the indoor demand load Q according to the relevant parametersNeed to. Wherein A iscThe value range is 50% -150%, Ac1The value range is 50% -150%, a fixed value can be selected in the value range in practical application to perform fuzzy calculation on indoor demand load, and the starting number of the compressors is preliminarily determined by matching with a subsequent starting sequence of the compressors.
It should be understood that the indoor unit of the multi-connected air conditioning unit does not necessarily include the fresh air indoor unit, but the indoor units may be all air conditioning indoor units, and when the indoor unit only has an air conditioning indoor unitTime, indoor demand load QNeed toAnd the superposed rated capacity calculation item of the starting-up fresh air indoor unit in the calculation formula is zero. Similarly, when the indoor unit has other different types of indoor units, the indoor demand load can increase the superposition rated capacity calculation item of the type of startup indoor unit. In fact, a great number of calculation methods capable of realizing the indoor demand load have appeared in the prior art, the above is only one embodiment proposed by the present invention, and the indoor demand load may also adopt other disclosed calculation methods.
Step 2, determining the starting sequence of all compressors in the air conditioning unit;
before starting up each time, the accumulated operation time of each compressor is obtained, the compressors are reordered and numbered according to the length of the accumulated operation time, the compressor with short accumulated operation time is started up preferentially, the logic of the shutdown priority is opposite to that of the startup priority, and the compressor with long accumulated operation time is shut down preferentially. In one embodiment, the serial numbers are gradually increased according to the starting sequence, the serial numbers of the compressors are continuous positive integers starting from the No. 1, the No. 1 compressor is the compressor which is started most preferentially, the No. 2 compressor is started next, and so on, and the serial numbers of the compressors started for the first time are completed through the mainboard dial of the control module.
It should be understood that the accumulated operating time is stopped when the compressor stops operating, and is continuously accumulated when the compressor starts operating, and the accumulated operating time is changed in real time along with the operating time of the compressor. In order to ensure the accuracy of numbering, before starting up each time, the accumulated running time of each current compressor needs to be acquired, and the compressors need to be sorted and numbered again.
Step 3, according to QNeed toDetermining the starting number of the compressors according to the capacity of each compressor;
starting from n equal to 1, the calculation is performed as shown in FIG. 2
Figure BDA0003412930360000051
And judging whether the calculation result is greater than 0, Qi#Capacity of compressor No. i;
if yes, the number of the current compressors started is indicatedThe superposed capacity of (a) cannot satisfy the indoor demand load QNeed toAdding 1 to n and assigning to n, and returning to calculation
Figure BDA0003412930360000052
And judging whether the settlement result is greater than 0;
if not, the overlapping capacity of the starting number of the current compressors can meet the indoor demand load QNeed toAnd determining the compressors with the numbers from 1 to n.
For ease of understanding, the following example will be described, assuming that n is 2,
Figure BDA0003412930360000053
more than 0, it means that the superposed capacity of the No. 1 compressor and the No. 2 compressor cannot meet the indoor demand load QNeed toAfter n is added with 1 and assigned a value of 3,
Figure BDA0003412930360000054
less than 0, which indicates that the superposed capacity of the No. 1 compressor, the No. 2 compressor and the No. 3 compressor can meet the indoor demand load QNeed toAnd determining to start the No. 1 compressor to the No. 3 compressor.
And 4, determining the starting number of the compressors, and adjusting the starting number of the compressors according to the running states of the started compressors and the started air conditioner internal units after starting.
If all started compressors reach the set maximum frequency and meet the set duration, the average room temperature difference of all started air conditioner internal units is determined
Figure BDA0003412930360000061
And average room temperature differential acceleration aAverage room temperatureAdjusting the starting number of the compressors. In some embodiments, the set maximum frequency is m times of the rated maximum frequency of the compressor, m and the set duration can be designed according to actual conditions, taking m as 0.8 and the set duration as 6min as examples, and when all started compressors reach 0.8 times of the maximum frequency and the continuous time reaches 6min in the state, the starting number of the compressors is adjusted。
Specifically, according to the average room temperature difference of all started air conditioner internal units
Figure BDA0003412930360000062
And average room temperature differential acceleration aAverage room temperatureAdjusting the starting number:
in the cooling mode of the air conditioner, the air conditioner is,
Figure BDA0003412930360000063
Figure BDA0003412930360000064
wherein q isiWhen the capacity of the started air conditioner indoor unit cannot be identified, the capacity value of the started air conditioner indoor unit is 1. T isi current indoor temperatureIs the actual room temperature T of the No. i started air conditioner internal uniti set valueIs the target room temperature of the air conditioner indoor unit started up in the ith number,
Figure BDA0003412930360000065
the calculated average room temperature for the nth sensing period,
Figure BDA0003412930360000066
and calculating the average room temperature for the (n + 1) th detection period, wherein A is the interval time from the nth detection period to the (n + 1) th detection period, the value range of A is 0-60 min, and the average room temperature is generally 3min by default.
When in use
Figure BDA0003412930360000067
And a isAverage room temperature＜ΔTtIn time, the starting requirement of one compressor is increased.
Figure BDA0003412930360000068
It is necessary to show that the actual room temperature of the started air conditioner internal unit is higher than the target room temperatureA case ofAverage room temperature＜ΔTtThe average room temperature fluctuation is not large, namely the room temperature is stable, the output capacity of the started compressor reaches the limit, and the target set by the user still cannot be met, so that the starting requirement of one compressor is increased, the load pressure of the started compressor is relieved, the started compressor is enabled to run at the medium and low frequency, and the target set by the user is met.
When in use
Figure BDA0003412930360000069
And a isAverage room temperature>ΔTtAnd when the pressure is + epsilon, the starting requirement of one compressor is reduced.
Figure BDA00034129303600000610
A, the actual room temperature of the started air conditioner indoor unit is less than the target room temperatureAverage room temperature＜ΔTtIt is indicated that the average room temperature fluctuates greatly, that is, the room temperature is further reduced, and the output capacity of the started compressor exceeds the target set by the user, so that the starting requirement of one compressor must be reduced, the operating frequency of the started compressor is reduced, the started compressor is operated at a low frequency and meets the indoor demand load.
Δ T in the abovetTo set the refrigeration temperature fluctuation, ε may be taken to be 0.1, which is a set margin.
In the heating mode, the heating device is arranged in the heating chamber,
Figure BDA0003412930360000071
Figure BDA0003412930360000072
when in use
Figure BDA0003412930360000073
And a isAverage room temperature＜ΔTtIn time, the starting requirement of one compressor is increased.
Figure BDA0003412930360000074
A, the actual room temperature of the started air conditioner indoor unit is less than the target room temperatureAverage room temperature＜ΔTtThe average room temperature fluctuation is not large, namely the room temperature is stable, the output capacity of the started compressor reaches the limit, and the target set by the user still cannot be met, so that the starting requirement of one compressor is increased, the load pressure of the started compressor is relieved, the started compressor is enabled to run at the medium and low frequency, and the target set by the user is met.
When in use
Figure BDA0003412930360000075
And a isAverage room temperature>ΔTtAnd when the pressure is + epsilon, the starting requirement of one compressor is reduced.
Figure BDA0003412930360000076
A, the actual room temperature of the started air conditioner indoor unit is larger than the target room temperatureAverage room temperature＜ΔTtIt is indicated that the average room temperature fluctuates greatly, that is, the room temperature is further increased, and the output capacity of the started compressor exceeds the target set by the user, so that the starting requirement of one compressor must be reduced, the operating frequency of the started compressor is reduced, the started compressor is operated at a low frequency and meets the indoor demand load.
It should be noted that when the number of the started compressors changes, the number of the started compressors is adjusted again according to the started compressors and the running states of the started air conditioner internal units. When the starting requirement of one compressor is increased, one compressor with the shortest accumulated running time is selected from the compressors except the starting number of the compressors to start; when the starting requirement of one compressor is reduced, one compressor with the longest accumulated running time is selected to be closed in the starting number of the compressors, and the compressors are reasonably opened or closed, so that the service life of the compressors is effectively prolonged.
When the front compressor and the rear compressor are started in sequence, the rear compressor waits for the initialization of the front compressor to be completed and then is started, when the front compressor and the rear compressor are stopped in sequence, the rear compressor waits for the set delay time after the front compressor is stopped and then is stopped, and the set delay time can be set for 5 min.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (13)

1. The control method of the multi-connected air conditioning unit is characterized by comprising the following steps:
calculating indoor demand load Q before starting upNeed to；
Determining the starting sequence of all compressors in the air conditioning unit;
according to said QNeed toAnd the capacity of each compressor determines the starting number of the compressors.
2. The control method according to claim 1, wherein after the number of starts of the compressors is determined and started,
and adjusting the starting number of the compressors according to the running states of the started compressors and the started air conditioner internal unit.
3. The control method according to claim 1, wherein the indoor demand load QNeed toThe calculation method is as follows:
Qneed toRated capacity Ac of sigma-start fresh air indoor unit1Plus sigma, the rated capacity Ac of the air conditioner indoor unit is started;
wherein A iscThe value range is 50% -150%, Ac1The value range is 50-150%.
4. The control method according to claim 3,
in the cooling mode of the air conditioner, the air conditioner is,Ac＝[(Tactual room temperature-7)×1.5+100+0.9×(TEnvironment(s)-35)]/100，Ac1＝[(4*TReturn air-60)/100；
In the heating mode, Ac＝[(20-TActual room temperature)×5+100+1.1×(7-TEnvironment(s))]/100，Ac1＝[(86-3.6*TReturn air)/100；
Wherein, TActual room temperatureActual room temperature, T, for starting the air conditioner indoor unitEnvironment(s)For the outdoor ambient temperature, T, of the air-conditioning indoor unit that has been turned onReturn airThe actual return air temperature of the started fresh air indoor unit.
5. The control method of claim 1, wherein determining the start-up sequence of all compressors in the air conditioning unit comprises:
before starting up each time, acquiring the accumulated running time of each compressor;
and reordering and numbering the compressors according to the length of the accumulated running time, wherein the compressors with short accumulated running time are started preferentially, and the numbers are gradually increased according to the starting sequence.
6. The control method of claim 5, wherein Q is based onNeed toAnd determining the starting number of the compressors according to the capacity of each compressor comprises the following steps:
starting from n equal to 1, calculate
Figure FDA0003412930350000011
Judging whether the calculation result is greater than 0;
if yes, adding 1 to n, then assigning to n, and returning to calculation
Figure FDA0003412930350000012
A step (2);
if not, determining to start the compressors from No. 1 to No. n;
wherein the number of the compressor is continuously positive from No. 1Number, Qi#The capacity of the compressor No. i.
7. The control method according to claim 2, wherein adjusting the number of started compressors according to the running states of the started compressors and the started air conditioner internal unit comprises:
if all started compressors reach the set maximum frequency and meet the set duration, the average room temperature difference of all started air conditioner internal units is determined
Figure FDA0003412930350000021
And average room temperature differential acceleration aAverage room temperatureAdjusting the starting number;
when in use
Figure FDA0003412930350000022
And a isAverage room temperature＜ΔTtIncreasing the starting requirement of a compressor;
when in use
Figure FDA0003412930350000023
And a isAverage room temperature>ΔTtWhen the pressure is higher than epsilon, the starting requirement of one compressor is reduced;
wherein, Delta TtEpsilon is a set margin for setting the fluctuation of the cooling temperature or the heating temperature.
8. The control method according to claim 7, wherein when there is a demand for increasing the starting of one compressor, the compressor with the shortest accumulated running time is selected to start in the compressors other than the starting number of the compressors; when the starting requirement of one compressor is reduced, one compressor with the longest accumulated running time is selected to be closed in the starting number of the compressors.
9. The control method of claim 7, wherein the average room temperature difference
Figure FDA0003412930350000024
And the average room temperature difference acceleration aAverage room temperatureThe calculation method is as follows:
in the cooling mode of the air conditioner, the air conditioner is,
Figure FDA0003412930350000025
Figure FDA0003412930350000026
in the heating mode, the heating device is arranged in the heating chamber,
Figure FDA0003412930350000027
Figure FDA0003412930350000028
wherein q isiIs the capacity, T, of the air conditioner indoor unit started up No. ii current indoor temperatureIs the actual room temperature T of the No. i started air conditioner internal uniti set valueIs the target room temperature of the air conditioner indoor unit started up in the ith number,
Figure FDA0003412930350000029
the calculated average room temperature for the nth sensing period,
Figure FDA00034129303500000210
the average room temperature calculated for the (n + 1) th detection period, and A is the interval time from the (n) th detection period to the (n + 1) th detection period.
10. The control method according to claim 9, wherein when the capacity of the turned-on air conditioner indoor unit cannot be identified, the capacity of the turned-on air conditioner indoor unit takes a value of 1.
11. The control method according to any one of claims 1 to 10, wherein when the front and rear compressors are sequentially started, the rear compressor waits for the initialization of the front compressor to be completed and then starts; when the front compressor and the rear compressor are sequentially shut down, the latter compressor waits for the set delay time and then is shut down after the former compressor is shut down.
12. Many online air conditioning unit includes: a control module, an outdoor unit having two or more compressors, and a plurality of indoor units connected to the outdoor unit, wherein the control module performs the control method according to any one of claims 1 to 11.
13. A multi-split air conditioning unit as set forth in claim 12, wherein the indoor unit comprises: an air conditioner indoor unit for adjusting the room temperature and a fresh air indoor unit for purifying the room air.
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