CN107166647B - Multi-split control method and system - Google Patents
Multi-split control method and system Download PDFInfo
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- CN107166647B CN107166647B CN201710356354.3A CN201710356354A CN107166647B CN 107166647 B CN107166647 B CN 107166647B CN 201710356354 A CN201710356354 A CN 201710356354A CN 107166647 B CN107166647 B CN 107166647B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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Abstract
The multi-split control method and the system thereof obtain the actual environment temperature, the set temperature, the actual environment humidity and the set humidity of each startup indoor unit, calculate the comfortable load rate of each startup indoor unit, calculate the total comfortable load, and adjust the frequency of a compressor and the opening degree of an expansion valve of the indoor unit according to the total comfortable load; the multi-split air conditioner control method of the embodiment considers the temperature, the humidity and the capacity matching of the indoor unit, calculates the total comfortable load, and then adjusts the frequency of the compressor and the opening degree of the expansion valve of the starting indoor unit according to the total comfortable load, so that the frequent fluctuation of the frequency of the compressor is avoided, the judgment accuracy of the comfortable sense is improved, the comfortable sense of the indoor unit is improved, the ideal comfortable sense of the indoor unit is realized, the balance and the stability of the multi-split air conditioner are improved, the satisfaction degree of users is improved, and the market competitiveness of the multi-split air conditioner is improved.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a multi-split air conditioner control method and system.
Background
In the multi-split air conditioning system, generally, one outdoor unit is connected to a plurality of indoor units. Each indoor unit is provided with an expansion valve, and the flow of a refrigerant entering the indoor unit heat exchanger is adjusted by controlling the opening degree of the expansion valve, so that the exchange of cold and heat with the outside is realized.
The indoor units are in different environments, and the requirements for air quality are greatly different. The key of multi-connected air conditioning is to judge the comfort of each indoor unit and achieve the system stability in the shortest time, thus realizing the ideal air conditioning environment of the indoor units.
At present, the comfort judgment of the indoor unit only considers the temperature factor, and the comfort judgment is inaccurate. And the opening degree of each indoor unit expansion valve is controlled by the indoor unit, so that the balance of the whole multi-split system is poor, the frequency fluctuation is frequent, and the system is difficult to stabilize.
Disclosure of Invention
The invention provides a multi-split control method, which improves the comfort of an indoor unit.
In order to solve the technical problems, the invention adopts the following technical scheme:
a multi-split air conditioner control method comprises an outdoor unit and a plurality of indoor units, wherein expansion valves are uniformly distributed on connecting pipelines of each indoor unit and the outdoor unit; the control method comprises the following steps:
(1) acquiring an actual environment temperature Tai, a set temperature Tsi, an actual environment humidity Hai and a set humidity Hsi of an ith starting indoor unit, wherein i is 1,2, 3. N is the number of the starting indoor units;
(2) calculating the comfortable load rate Loadi of the ith starting indoor unit:
in the refrigeration working condition:
in the heating working condition:
wherein x is the weight occupied by the temperature factor, y is the weight occupied by the humidity factor, and x + y is 1;
(3) calculating total comfort load
HPi is the capacity matching number of the ith startup indoor unit;
(4) and adjusting the frequency of the compressor and the opening degree of an expansion valve of the indoor unit according to the total comfortable load SumLoad.
Further, according to total comfort load SumLoad adjustment compressor frequency and the expansion valve aperture of indoor set, specifically include:
when SumLoad is larger than or equal to a first set threshold value, improving the frequency of the compressor, and reducing the opening degree of an expansion valve of the indoor unit, wherein the comfortable load rate of the expansion valve is smaller than 0;
when SumLoad is less than a second set threshold value, reducing the frequency of the compressor, and increasing the opening degree of an expansion valve of the indoor unit, wherein the comfortable load rate of the indoor unit is greater than 0;
when the second set threshold value is less than or equal to SumLoad and less than the first set threshold value, the frequency of the compressor is unchanged, the opening degree of the indoor unit expansion valve with the comfortable load rate less than 0 is reduced, and the opening degree of the indoor unit expansion valve with the comfortable load rate more than 0 is increased;
wherein the first set threshold is greater than 0 and the second set threshold is less than 0.
Still further, when SumLoad is greater than or equal to the first set threshold, the method for increasing the frequency of the compressor specifically includes:
calculating a frequency correction value HzVal-SumLoad frequency coefficient; wherein the frequency coefficient is a performance parameter of the compressor;
the new compressor frequency Hz1 is the current frequency Hz0+ the frequency correction value HzVal.
Furthermore, when SumLoad is larger than or equal to the first set threshold, the method for reducing the opening degree of the expansion valve of the indoor unit with the comfort load rate smaller than 0 specifically comprises the following steps:
calculating an opening correction value Vj (Lj) Loadj Hz1/Hz 0; vj is an opening correction value of an expansion valve of the j-th indoor unit; lj is the current opening value of the expansion valve of the j indoor unit;
and according to the opening correction value Vj, reducing the opening of the expansion valve of the indoor unit with the corresponding comfortable load rate less than 0.
Still further, when SumLoad is less than the second set threshold, reducing the frequency of the compressor, specifically including:
calculating a frequency correction value HzVal-SumLoad frequency coefficient; wherein the frequency coefficient is a performance parameter of the compressor;
the new compressor frequency Hz1 is the current frequency Hz0+ the frequency correction value HzVal.
Preferably, when SumLoad < the second set threshold, the method of increasing the opening degree of the expansion valve of the indoor unit having the comfort load factor greater than 0 includes:
calculating an opening correction value Vk-Lk-Loadk-Hz 0/Hz 1; vk is the corrected value of the opening degree of the expansion valve of the kth indoor unit; lk is the current opening value of the expansion valve of the kth indoor unit;
and according to the opening correction value Vk, increasing the opening of the expansion valve of the indoor unit with the corresponding comfortable load rate more than 0.
Further, when the second set threshold value is less than or equal to SumLoad and less than the first set threshold value, the opening degree of the indoor unit expansion valve with the comfortable load rate less than 0 is reduced, and the opening degree of the indoor unit expansion valve with the comfortable load rate more than 0 is increased; the method specifically comprises the following steps:
calculating a correction value for the degree of opening
Wherein, Sigma Loadn HPn represents the cumulative sum of the products of the comfortable load rates and the capacity matching numbers of all the indoor units with the comfortable load rates less than 0; vj is an opening correction value of an expansion valve of the j-th indoor unit; lj is the current opening value of the expansion valve of the j indoor unit;
according to the opening correction value Vj, reducing the opening of an expansion valve of the indoor unit of which the corresponding comfortable load rate is less than 0;
calculating a correction value for the degree of opening
Wherein, Σ Loadm · HPm represents the cumulative sum of the products of the comfort load rates and the capacity fractions of all the indoor units having comfort load rates greater than 0; vk is the corrected value of the opening degree of the expansion valve of the kth indoor unit; lk is the current opening value of the expansion valve of the kth indoor unit;
and according to the opening correction value Vk, increasing the opening of the expansion valve of the indoor unit with the corresponding comfortable load rate more than 0.
A multiple online control system, comprising: the acquisition module is used for acquiring the actual environment temperature, the set temperature, the actual environment humidity and the set humidity of the starting indoor unit; the comfortable load rate calculation module is used for calculating the comfortable load rate of the starting indoor unit; the total comfortable load calculation module is used for calculating the total comfortable load; and the adjusting module is used for adjusting the frequency of the compressor and the opening degree of an expansion valve of the indoor unit according to the total comfortable load.
Further, the adjusting module is specifically configured to: when the total comfortable load is larger than or equal to a first set threshold value, the frequency of the compressor is improved, and the opening degree of an expansion valve of the indoor unit, of which the comfortable load rate is smaller than 0, is reduced; when the total comfortable load is less than a second set threshold value, reducing the frequency of the compressor, and increasing the opening degree of an expansion valve of the indoor unit, wherein the comfortable load rate is greater than 0; when the second set threshold value is less than or equal to the total comfortable load and less than the first set threshold value, the frequency of the compressor is unchanged, the opening degree of the indoor unit expansion valve with the comfortable load rate less than 0 is reduced, and the opening degree of the indoor unit expansion valve with the comfortable load rate more than 0 is increased; wherein the first set threshold is greater than 0 and the second set threshold is less than 0.
Compared with the prior art, the invention has the advantages and positive effects that: the multi-split control method and the system thereof obtain the actual environment temperature, the set temperature, the actual environment humidity and the set humidity of each startup indoor unit, calculate the comfortable load rate of each startup indoor unit, calculate the total comfortable load, and adjust the frequency of a compressor and the opening degree of an expansion valve of the indoor unit according to the total comfortable load; the multi-split air conditioner control method of the embodiment considers the temperature, the humidity and the capacity matching of the indoor unit, calculates the total comfortable load, and then adjusts the frequency of the compressor and the opening degree of the expansion valve of the starting indoor unit according to the total comfortable load, so that the frequent fluctuation of the frequency of the compressor is avoided, the judgment accuracy of the comfortable sense is improved, the comfortable sense of the indoor unit is improved, the ideal comfortable sense of the indoor unit is realized, the balance and the stability of the multi-split air conditioner are improved, the satisfaction degree of users is improved, and the market competitiveness of the multi-split air conditioner is improved.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a block diagram of a multi-split air conditioner;
FIG. 2 is a flow chart of one embodiment of a multi-split control method proposed by the present invention;
fig. 3 is a block diagram of a multi-split control system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
The multi-split air conditioner comprises an outdoor unit and a plurality of indoor units, wherein expansion valves are uniformly distributed on a connecting pipeline of each indoor unit and the outdoor unit. The expansion valve is generally disposed on a liquid pipe of the indoor unit to regulate the flow of the refrigerant flowing into the indoor unit. And a liquid pipe of each indoor unit is connected with a liquid pipe of the outdoor unit. For example, referring to fig. 1, an expansion valve 1 is disposed on a liquid pipe of an indoor unit 1, an expansion valve 2 is disposed on a liquid pipe of the indoor unit 2, expansion valves 3 and … … are disposed on a liquid pipe of an indoor unit 3, and an expansion valve N is disposed on a liquid pipe of an indoor unit N.
The multi-split control method of the embodiment mainly includes the following steps, which are shown in fig. 2.
Step S1: acquiring an actual environment temperature Tai, a set temperature Tsi, an actual environment humidity Hai and a set humidity Hsi of an ith starting indoor unit, wherein i is 1,2, 3. N is the number of the starting indoor units;
specifically, the actual ambient temperature Ta1, the set temperature Ts1, the actual ambient humidity Ha1 and the set humidity Hs1 of the 1 st starting indoor unit are obtained; obtaining the actual environmental temperature Ta2, the set temperature Ts2, the actual environmental humidity Ha2 and the set humidity Hs2 of the 2 nd starting indoor unit; obtaining the actual environmental temperature Ta3, the set temperature Ts3, the actual environmental humidity Ha3 and the set humidity Hs3 of the 3 rd starting indoor unit; … …, respectively; the actual ambient temperature TaN, the set temperature TsN, the actual ambient humidity HaN, and the set humidity HsN of the nth powered indoor unit are obtained.
Step S2: calculating the comfortable load rate Loadi of the ith starting indoor unit:
in the refrigeration working condition:
in the heating working condition:
wherein x is the weight occupied by the temperature factor, y is the weight occupied by the humidity factor, and x + y is 1. x and y are designed according to the actual climate conditions of each region. For example, southern humidity is large, humidity effects are large, and y can be set to be large; northern weather is dry, humidity is low, people are sensitive to temperature changes, and x can be set to be larger. After the values of x and y are set by the remote controller, the values are sent to the indoor machine control panel and then sent to the outdoor machine control panel through the indoor machine control panel.
In the refrigeration working condition: comfort load rate of 1 st starting indoor unit
Comfort load rate of 2 nd indoor unit
… … comfortable load factor of the Nth indoor unit
In the heating working condition: comfort load rate of 1 st starting indoor unit
Comfort load rate of 2 nd indoor unit
… … comfortable load factor of the Nth indoor unit
When the Loadi is equal to 0, the ith indoor unit just meets the requirement of the user;
when the Loadi is larger than 0, the ith indoor unit does not meet the requirements of the user;
when Loadi is less than 0, it indicates that the ith indoor unit has exceeded the user's demand.
The absolute value of Loadi indicates the degree of deviation from the target value, which is 0.
Step S3: calculating total comfort load
The HPi is the capability matching number of the ith startup indoor unit. Such as 1HP, 3HP, etc.
SumLoad is considered from the multi-split air conditioner as a whole, the capacity of each indoor unit is different, the capacity of the indoor unit corresponds to the adjustable room area, the room area is large, and the capacity of the selected indoor unit is larger. Therefore, the calculation of SumLoad needs to increase the capacity matching factor of the indoor unit in view of the whole.
Step S4: and adjusting the frequency of the compressor and the opening degree of an expansion valve of the indoor unit according to the total comfortable load SumLoad.
The frequency of the compressor is adjusted according to the total comfortable load SumLoad, frequent frequency fluctuation is avoided, the opening degree of an expansion valve of the indoor unit is adjusted according to the total comfortable load SumLoad, the comfortable sensation of the indoor unit is improved, and the balance and the stability of the multi-split air conditioner are improved.
The multi-split control method of the embodiment acquires the actual environment temperature, the set temperature, the actual environment humidity and the set humidity of each startup indoor unit, calculates the comfort load rate of each startup indoor unit, calculates the total comfort load, and adjusts the frequency of a compressor and the opening degree of an expansion valve of the indoor unit according to the total comfort load; the multi-split air conditioner control method of the embodiment considers the temperature, the humidity and the capacity matching of the indoor unit, calculates the total comfortable load, and then adjusts the frequency of the compressor and the opening degree of the expansion valve of the starting indoor unit according to the total comfortable load, so that the frequent fluctuation of the frequency of the compressor is avoided, the judgment accuracy of the comfortable sense is improved, the comfortable sense of the indoor unit is improved, the ideal comfortable sense of the indoor unit is realized, the balance and the stability of the multi-split air conditioner are improved, the satisfaction degree of users is improved, and the market competitiveness of the multi-split air conditioner is improved.
Adjusting the frequency of a compressor and the opening degree of an expansion valve of an indoor unit according to the total comfort load SumLoad, and specifically comprising the following contents:
when SumLoad is larger than or equal to a first set threshold value, the frequency of the compressor is increased, and the opening degree of an expansion valve of the indoor unit, with the comfortable load rate being smaller than 0, is reduced. The first set threshold is > 0, such as 0.5.
(1) When SumLoad is larger than or equal to the first set threshold, it indicates that the multi-split air conditioner cannot meet the requirements of the user as a whole, and therefore, the frequency of the outdoor unit compressor needs to be increased to improve the refrigerating/heating, humidifying/dehumidifying and other capabilities of the multi-split air conditioner so as to meet the requirements of the user.
First, a frequency correction value HzVal is calculated as SumLoad frequency coefficient. In this embodiment, the frequency coefficient represents a conversion coefficient between the load and the frequency of the compressor, and is a performance parameter of the compressor itself, and can be obtained by checking a specification of the compressor. The frequency coefficient is greater than 0, e.g. 1.5.
Then, the compressor new frequency Hz1 is calculated as the current frequency Hz0+ the frequency correction value HzVal. Since SumLoad is greater than 0, HzVal is greater than 0 and the compressor frequency increases.
(2) The indoor unit with the comfortable load rate less than 0 is certainly beyond the requirement of a user when the frequency of the compressor is increased due to the fact that the requirement of the user is exceeded, and therefore the opening degree of an expansion valve of the indoor unit with the comfortable load rate less than 0 needs to be reduced to reduce the flow of a refrigerant, so that the comfortable load rate is close to 0 as much as possible, and energy waste is avoided.
Firstly, calculating an opening correction value Vj-Lj-Loadj-Hz 1/Hz 0; vj is an opening correction value of an expansion valve of the j-th indoor unit; lj is the current opening value of the expansion valve of the j indoor unit; loadj is the comfort load factor of the j-th indoor unit. In the calculation of the correction value, the change of the frequency of the compressor is considered so as to obtain a reasonable correction value, reduce the refrigerant flow of the corresponding indoor unit and avoid energy waste.
Then, the expansion valve opening degree of the indoor unit, which corresponds to the comfort load factor of less than 0, is reduced based on the opening degree correction value Vj.
(3) The indoor unit with the comfortable load rate more than 0 has the advantages that as the refrigerating/heating, humidifying/dehumidifying and other capacities of the indoor unit are improved when the frequency of the compressor is increased, the comfortable load rate is reduced, the comfortable load rate is close to 0, and the requirements of users are met gradually, so that the opening degree of an expansion valve of the indoor unit with the comfortable load rate more than 0 is not adjusted.
(4) In the indoor unit having a comfort load factor of 0, the opening degree of the expansion valve is not adjusted because the demand of the user is satisfied.
And secondly, when SumLoad is less than a second set threshold value, reducing the frequency of the compressor and increasing the opening degree of the expansion valve of the indoor unit, wherein the comfortable load rate of the indoor unit is more than 0. The second set threshold is < 0, e.g., -0.5.
(1) When SumLoad is less than the second set threshold, it indicates that the multi-split air conditioner has exceeded the demands of the users as a whole, and therefore, the frequency of the compressor needs to be reduced to reduce the cooling/heating, humidifying/dehumidifying and other capabilities of the multi-split air conditioner, and avoid energy waste.
First, a frequency correction value HzVal is calculated as SumLoad frequency coefficient.
Then, the compressor new frequency Hz1 is calculated as the current frequency Hz0+ the frequency correction value HzVal. Since SumLoad is less than 0, HzVal is less than 0 and the compressor frequency is reduced.
(2) The comfort load factor is greater than 0's indoor set, because unsatisfied user demand, when compressor frequency reduces, will certainly not satisfy user demand more, therefore the expansion valve aperture of the indoor set that the comfort load factor is greater than 0 needs the increase to increase the refrigerant flow, make the comfort load factor be close to 0 as far as possible, compensate because the compressor frequency reduces the performance reduction that leads to, promote user comfort.
Firstly, calculating an opening correction value Vk-Lk-Loadk-Hz 0/Hz 1; vk is the corrected value of the opening degree of the expansion valve of the kth indoor unit; lk is the current opening value of the expansion valve of the kth indoor unit; loadk is the comfort load factor of the kth indoor unit. In the calculation of the correction value, the change of the frequency of the compressor is considered so as to obtain a reasonable correction value, increase the flow rate of the refrigerant and meet the requirements of users.
Then, the expansion valve opening degree of the indoor unit having the comfort load factor greater than 0 is increased based on the opening degree correction value Vk.
(3) In the indoor unit with the comfortable load rate less than 0, as the refrigerating/heating, humidifying/dehumidifying capacity of the indoor unit is reduced when the frequency of the compressor is reduced, the comfortable load rate is increased, the comfortable load rate is close to 0, and the requirement of a user is gradually met, so that the opening degree of the expansion valve of the indoor unit with the comfortable load rate less than 0 is not adjusted.
(4) In the indoor unit having a comfort load factor of 0, the opening degree of the expansion valve is not adjusted because the demand of the user is satisfied.
And thirdly, when the second set threshold is less than or equal to SumLoad and less than the first set threshold, the frequency of the compressor is unchanged, the opening degree of the expansion valve of the indoor unit with the comfortable load rate less than 0 is reduced, and the opening degree of the expansion valve of the indoor unit with the comfortable load rate more than 0 is increased.
(1) And when the second set threshold is less than or equal to SumLoad and less than the first set threshold, the multi-split air conditioner is shown to meet the requirements of users on the whole, and the frequency of the compressor is kept unchanged in order to keep the stability of the multi-split air conditioner.
(2) Indoor units with a comfort load rate less than 0 have exceeded the needs of the user. When the frequency of the compressor is unchanged, the opening degree of an expansion valve of the indoor unit with the comfortable load rate smaller than 0 is reduced to reduce the flow rate of the refrigerant, so that the comfortable load rate is close to 0 as much as possible, and the energy waste is avoided.
First, an opening correction value is calculated
Wherein, Sigma Loadn HPn represents the cumulative sum of the products of the comfortable load rates and the capacity matching numbers of all the indoor units with the comfortable load rates less than 0; vj is an opening correction value of an expansion valve of the j-th indoor unit; lj is the current opening value of the expansion valve of the j indoor unit; loadj is the comfort load factor of the jth indoor unit, and HPj is the capacity match of the jth indoor unit. In the calculation of the correction value, the factor of capacity matching of the indoor units is considered, so that a reasonable correction value is obtained, the refrigerant flow of the corresponding indoor unit is reduced, and energy waste is avoided.
Then, the expansion valve opening degree of the indoor unit, which corresponds to the comfort load factor of less than 0, is reduced based on the opening degree correction value Vj.
(3) The indoor unit with the comfortable load rate more than 0 shows that the requirement of the user is not met. When the frequency of the compressor is unchanged, the opening degree of an expansion valve of the indoor unit with the comfortable load rate larger than 0 is increased to increase the flow rate of the refrigerant, so that the comfortable load rate is close to 0 as much as possible, and the comfortable feeling of a user is improved.
First, an opening correction value is calculated
Wherein, Σ Loadm · HPm represents the cumulative sum of the products of the comfort load rates and the capacity fractions of all the indoor units having comfort load rates greater than 0; vk is the corrected value of the opening degree of the expansion valve of the kth indoor unit; lk is the current opening value of the expansion valve of the kth indoor unit; loadk is the comfort load factor of the kth indoor unit, and HPk is the capacity match of the kth indoor unit. In the calculation of the correction value, the change of the frequency of the compressor is considered so as to obtain a reasonable correction value, increase the flow rate of the refrigerant and meet the requirements of users.
Then, the expansion valve opening degree of the indoor unit having the comfort load factor greater than 0 is increased based on the opening degree correction value Vk.
(4) In the indoor unit having a comfort load factor of 0, the opening degree of the expansion valve is not adjusted because the demand of the user is satisfied.
Taking the cooling operation condition as an example, the number N of the turned-on indoor units is 5, x is 0.7, y is 0.3, the first set threshold is 0.5, the second set threshold is-0.5, and the frequency coefficient is 1.5, and the specific steps of the multi-split air conditioner control method are described in detail below.
Table one:
(1) according to x, y and Tsi, Tai, His and Hai in the table I, calculating the comfortable sensation load rate of the i-th starting indoor unit
Fill in table one.
(2) Computing
I.e., SumLoad is greater than the first set threshold.
(3) Increasing the frequency of the compressor:
the frequency correction value HzVal is SumLoad, the frequency coefficient is 1.3, 1.5 is 1.95 Hz.
Assuming that the current frequency Hz0 is 50Hz, the new frequency Hz1 of the compressor is 50Hz +1.95Hz or 51.95 Hz.
(4) Adjusting the opening degree of an expansion valve of the indoor unit:
the comfortable Load rate Load1 of the 1# indoor unit is 0.3 > 0, and the comfortable Load rate Load2 of the 2# indoor unit is 0.16 > 0, so the expansion valve opening degrees of the 1# and 2# indoor units are not adjusted.
The comfort Load rate Load3 of # 3 indoor unit is-0.05 < 0, and the opening degree of the expansion valve needs to be reduced:
the opening correction value is V3 ═ L3 ═ Load3 ═ Hz1/Hz0 ═ 153 × (-0.05) × 51.95/50 ≈ -8, and the new valve opening is 153-8 ═ 145.
The comfortable Load rate Load4 of the 4# indoor unit is-0.06 < 0, and the opening degree of the expansion valve needs to be reduced:
the opening correction value is V4 ═ L4 ═ Load4 ═ Hz1/Hz0 ═ 142 × (-0.06) × 51.95/50 ≈ -9, and the new valve opening is 142-9 ═ 133.
The comfortable Load rate Load5 of # 5 indoor unit is-0.06 < 0, and the opening degree of the expansion valve needs to be reduced:
the opening correction value is V5 ═ L5 ═ Load5 ═ Hz1/Hz0 ═ 89 ≈ 89 (-0.06) × 51.95/50 ≈ -6, and the new valve opening is 89-6 ═ 83.
Table two:
(1) according to x, y and Tsi, Tai, His and Hai in the second table, calculating the comfortable feeling load rate of the i-th starting indoor unit
Fill in table two.
(2) Computing
Namely-0.5 < SumLoad < 0.5.
(3) The compressor frequency is unchanged.
(4) Adjusting the opening degree of an expansion valve of the indoor unit:
comfortable load rates of the 1# and 2# indoor units are both greater than 0, and the opening degree of the expansion valve needs to be increased;
the comfortable load rates of the 3#, 4#, and 5# indoor units are all less than 0, and the opening degree of the expansion valve needs to be reduced.
The comfort Load rate Load1 of the indoor unit # 1 is 0.04 > 0, and the expansion valve opening degree needs to be increased:
opening correction value
The new valve opening is 130+ 3-133.
The comfort Load rate Load2 of # 2 indoor unit is 0.13 > 0, and the expansion valve opening degree needs to be increased:
opening correction value
The new valve opening is 160+ 10-170.
The comfort Load rate Load3 of # 3 indoor unit is-0.05 < 0, and the opening degree of the expansion valve needs to be reduced:
opening correction value
The new valve opening is 126-3 ═ 123.
The comfortable Load rate Load4 of the 4# indoor unit is-0.08 < 0, and the opening degree of the expansion valve needs to be reduced:
opening correction value
The new valve opening is 118-2-116.
The comfortable Load rate Load5 of # 5 indoor unit is-0.06 < 0, and the opening degree of the expansion valve needs to be reduced:
opening correction value
The new valve opening is 76-2-74.
The embodiment also provides a multi-connected control system, which comprises an acquisition module, a comfortable load rate calculation module, a total comfortable load calculation module, an adjustment module and the like, and is shown in fig. 3.
And the acquisition module is used for acquiring the actual environment temperature, the set temperature, the actual environment humidity and the set humidity of the starting indoor unit.
And the comfortable load rate calculation module is used for calculating the comfortable load rate of the starting indoor unit.
And the total comfortable load calculation module is used for calculating the total comfortable load.
And the adjusting module is used for adjusting the frequency of the compressor and the opening degree of an expansion valve of the indoor unit according to the total comfortable load.
The adjustment module is specifically configured to: when the total comfortable load is larger than or equal to a first set threshold value, the frequency of the compressor is improved, and the opening degree of an expansion valve of the indoor unit, of which the comfortable load rate is smaller than 0, is reduced; when the total comfortable load is less than a second set threshold value, reducing the frequency of the compressor, and increasing the opening degree of an expansion valve of the indoor unit, wherein the comfortable load rate is greater than 0; when the second set threshold value is less than or equal to the total comfortable load and less than the first set threshold value, the frequency of the compressor is unchanged, the opening degree of the indoor unit expansion valve with the comfortable load rate less than 0 is reduced, and the opening degree of the indoor unit expansion valve with the comfortable load rate more than 0 is increased; wherein the first set threshold is greater than 0 and the second set threshold is less than 0.
The working process of the multi-connected control system has been described in detail in the above multi-connected control method, and is not described herein again.
The multi-split control system of the embodiment acquires the actual environment temperature, the set temperature, the actual environment humidity and the set humidity of each startup indoor unit, calculates the comfort load rate of each startup indoor unit, calculates the total comfort load, and adjusts the frequency of a compressor and the opening degree of an expansion valve of the indoor unit according to the total comfort load; the multi-split air conditioner control method of the embodiment considers the temperature, the humidity and the capacity matching of the indoor unit, calculates the total comfortable load, and then adjusts the frequency of the compressor and the opening degree of the expansion valve of the starting indoor unit according to the total comfortable load, so that the frequent fluctuation of the frequency of the compressor is avoided, the judgment accuracy of the comfortable sense is improved, the comfortable sense of the indoor unit is improved, the ideal comfortable sense of the indoor unit is realized, the balance and the stability of the multi-split air conditioner are improved, the satisfaction degree of users is improved, and the market competitiveness of the multi-split air conditioner is improved.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. A multi-split air conditioner control method comprises an outdoor unit and a plurality of indoor units, wherein expansion valves are uniformly distributed on connecting pipelines of each indoor unit and the outdoor unit; the method is characterized in that: the control method comprises the following steps:
(1) acquiring an actual environment temperature Tai, a set temperature Tsi, an actual environment humidity Hai and a set humidity Hsi of an ith starting indoor unit, wherein i is 1,2, 3. N is the number of the starting indoor units;
(2) calculating the comfortable load rate Loadi of the ith starting indoor unit:
in the refrigeration working condition:
in the heating working condition:
wherein x is the weight occupied by the temperature factor, y is the weight occupied by the humidity factor, and x + y is 1;
(3) calculating total comfort load
HPi is the capacity matching number of the ith startup indoor unit;
(4) and adjusting the frequency of the compressor and the opening degree of an expansion valve of the indoor unit according to the total comfortable load SumLoad.
2. A multi-split control method as defined in claim 1, wherein: according to total comfort load SumLoad adjustment compressor frequency and the expansion valve aperture of indoor set, specifically include:
when SumLoad is larger than or equal to a first set threshold value, improving the frequency of the compressor, and reducing the opening degree of an expansion valve of the indoor unit, wherein the comfortable load rate of the expansion valve is smaller than 0;
when SumLoad is less than a second set threshold value, reducing the frequency of the compressor, and increasing the opening degree of an expansion valve of the indoor unit, wherein the comfortable load rate of the indoor unit is greater than 0;
when the second set threshold value is less than or equal to SumLoad and less than the first set threshold value, the frequency of the compressor is unchanged, the opening degree of the indoor unit expansion valve with the comfortable load rate less than 0 is reduced, and the opening degree of the indoor unit expansion valve with the comfortable load rate more than 0 is increased;
wherein the first set threshold is greater than 0 and the second set threshold is less than 0.
3. A multi-split control method as defined in claim 2, wherein: when SumLoad is larger than or equal to a first set threshold, improving the frequency of the compressor, and specifically comprising the following steps:
calculating a frequency correction value HzVal-SumLoad frequency coefficient; wherein the frequency coefficient is a performance parameter of the compressor;
the new compressor frequency Hz1 is the current frequency Hz0+ the frequency correction value HzVal.
4. A multi-split control method as defined in claim 3, wherein: when SumLoad is larger than or equal to a first set threshold value, the opening degree of the expansion valve of the indoor unit, of which the comfortable load rate is smaller than 0, is reduced, and the method specifically comprises the following steps:
calculating an opening correction value Vj (Lj) Loadj Hz1/Hz 0; vj is an opening correction value of an expansion valve of the j-th indoor unit; lj is the current opening value of the expansion valve of the j indoor unit;
and according to the opening correction value Vj, reducing the opening of the expansion valve of the indoor unit with the corresponding comfortable load rate less than 0.
5. A multi-split control method as defined in claim 2, wherein: when SumLoad is less than a second set threshold, reducing the frequency of the compressor, specifically comprising:
calculating a frequency correction value HzVal-SumLoad frequency coefficient; wherein the frequency coefficient is a performance parameter of the compressor;
the new compressor frequency Hz1 is the current frequency Hz0+ the frequency correction value HzVal.
6. The multiple on-line control method according to claim 5, characterized in that: when SumLoad is less than a second set threshold, the opening degree of the expansion valve of the indoor unit, of which the comfortable load rate is greater than 0, is increased, and the method specifically comprises the following steps:
calculating an opening correction value Vk-Lk-Loadk-Hz 0/Hz 1; vk is the corrected value of the opening degree of the expansion valve of the kth indoor unit; lk is the current opening value of the expansion valve of the kth indoor unit;
and according to the opening correction value Vk, increasing the opening of the expansion valve of the indoor unit with the corresponding comfortable load rate more than 0.
7. A multi-split control method as defined in claim 2, wherein: when the second set threshold value is less than or equal to SumLoad and less than the first set threshold value, reducing the opening degree of the indoor unit expansion valve with the comfortable load rate less than 0, and increasing the opening degree of the indoor unit expansion valve with the comfortable load rate more than 0; the method specifically comprises the following steps:
calculating a correction value for the degree of opening
Wherein, Sigma Loadn HPn represents the cumulative sum of the products of the comfortable load rates and the capacity matching numbers of all the indoor units with the comfortable load rates less than 0; vj is an opening correction value of an expansion valve of the j-th indoor unit; lj is the expansion valve of the j-th indoor unitA front opening value;
according to the opening correction value Vj, reducing the opening of an expansion valve of the indoor unit of which the corresponding comfortable load rate is less than 0;
calculating a correction value for the degree of opening
Wherein, Σ Loadm · HPm represents the cumulative sum of the products of the comfort load rates and the capacity fractions of all the indoor units having comfort load rates greater than 0; vk is the corrected value of the opening degree of the expansion valve of the kth indoor unit; lk is the current opening value of the expansion valve of the kth indoor unit;
and according to the opening correction value Vk, increasing the opening of the expansion valve of the indoor unit with the corresponding comfortable load rate more than 0.
8. A multi-connected machine control system is characterized in that: the method comprises the following steps:
the acquisition module is used for acquiring the actual environment temperature, the set temperature, the actual environment humidity and the set humidity of the starting indoor unit;
the comfortable load rate calculation module is used for calculating the comfortable load rate of the starting indoor unit;
in the refrigeration working condition:
in the heating working condition:
wherein x is the weight occupied by the temperature factor, y is the weight occupied by the humidity factor, and x + y is 1;
the load is the comfortable load rate of the ith starting indoor unit, and the Tai, the Tsi, the Hai and the Hsi are the actual environment temperature, the set temperature, the actual environment humidity and the set humidity of the ith starting indoor unit respectively, wherein i is 1,2, 3. N is the number of the starting indoor units;
a total comfortable load calculating module for calculating total comfortable load
HPi is the capacity matching number of the ith startup indoor unit;
and the adjusting module is used for adjusting the frequency of the compressor and the opening degree of an expansion valve of the indoor unit according to the total comfortable load.
9. The control system of claim 8, wherein: the adjustment module is specifically configured to:
when the total comfortable load is larger than or equal to a first set threshold value, the frequency of the compressor is improved, and the opening degree of an expansion valve of the indoor unit, of which the comfortable load rate is smaller than 0, is reduced;
when the total comfortable load is less than a second set threshold value, reducing the frequency of the compressor, and increasing the opening degree of an expansion valve of the indoor unit, wherein the comfortable load rate is greater than 0;
when the second set threshold value is less than or equal to the total comfortable load and less than the first set threshold value, the frequency of the compressor is unchanged, the opening degree of the indoor unit expansion valve with the comfortable load rate less than 0 is reduced, and the opening degree of the indoor unit expansion valve with the comfortable load rate more than 0 is increased;
wherein the first set threshold is greater than 0 and the second set threshold is less than 0.
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| CN107726554B (en) * | 2017-09-19 | 2020-01-17 | 青岛海尔空调电子有限公司 | Multi-split comfort level balance control method and system |
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| CN113587408B (en) * | 2021-07-30 | 2022-11-29 | 美的集团武汉暖通设备有限公司 | Multi-split air conditioner, control method thereof and readable storage medium |
| CN113883680B (en) * | 2021-09-28 | 2023-06-16 | 青岛海尔中央空调有限公司 | Method for quickly improving effect of air conditioner indoor unit |
| CN114216221B (en) * | 2021-12-20 | 2023-06-02 | 宁波奥克斯电气股份有限公司 | Detection method and device for multi-split air conditioner, multi-split air conditioner and storage medium |
| CN115654712B (en) * | 2022-10-24 | 2024-06-14 | 宁波奥克斯电气股份有限公司 | Multi-connected air conditioner control method and device and multi-connected air conditioner |
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| CN106482248B (en) * | 2015-08-25 | 2019-07-19 | 中南大学 | Control system of machine room air conditioner based on multi-connected air conditioner |
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