CN111637526A - Control method of mixed and collocated multi-split system - Google Patents
Control method of mixed and collocated multi-split system Download PDFInfo
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- CN111637526A CN111637526A CN202010478661.0A CN202010478661A CN111637526A CN 111637526 A CN111637526 A CN 111637526A CN 202010478661 A CN202010478661 A CN 202010478661A CN 111637526 A CN111637526 A CN 111637526A
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
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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
- F24F11/32—Responding to malfunctions or emergencies
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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
- F24F11/62—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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
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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
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The invention discloses a control method of a mixed and collocated multi-split air conditioner system, which comprises the following steps that A, when each indoor unit is electrified and initially operated, the initial opening and the opening adjusting range of an electronic expansion valve of the indoor unit are calculated and determined based on the capacity condition of the indoor unit and the current working mode; b, each indoor unit which is electrified and initially operated firstly adjusts the electronic expansion valve of the indoor unit to a target opening degree within an opening degree adjusting range correspondingly according to the difference value between the heat exchanger inlet temperature TA and the heat exchanger outlet temperature TB which are obtained in real time and by taking the initial opening degree as a start; and C, correspondingly adjusting the electronic expansion valve of the indoor unit to the target opening degree within the opening degree adjusting range on the basis of the difference value between the real heat exchanger inlet temperature TA and the real heat exchanger outlet temperature TB acquired in real time after the primarily adjusted indoor unit and the target opening degree after the primary adjustment.
Description
Technical Field
The invention relates to the technical field of multi-split systems, in particular to a control method of a mixed and collocated multi-split system.
Background
The return air of the indoor unit of a general air conditioner is air in an indoor room, and the air circulates indoors all the time and is generally not fresh; a comfortable indoor environment usually requires a certain amount of fresh air entering a room through the outside, and a fresh air blower is usually installed to obtain fresh air.
The return air inlet of the fresh air machine of the air conditioner needs to be connected with an air inlet to introduce fresh air into an indoor room from the outdoor side, and when the single outdoor side environment temperature is higher than that of the indoor room (for example, the outdoor environment temperature is 40 ℃ and the indoor environment temperature is 27 ℃), the return air temperature of the indoor machine of the fresh air machine is 40 ℃, the return air temperature of the common indoor machine is 27 ℃ and the outlet air temperature of the indoor machine of the fresh air machine is higher than that of the common indoor machine under the same condition. The common method is that a fresh air machine is independently used as a set of system, and a common air duct machine is independently used as a set of system.
The outdoor unit in the multi-split system can be matched with a plurality of indoor units, and the multi-split system has better performance. Due to the large difference between the return air temperature of the fresh air fan and the return air temperature of the common indoor unit, if the fresh air fan and the common indoor unit are installed in a mixed mode in the same system, mutual influence is caused, on one hand, the temperature of air sent out by the fresh air fan is not too high, on the other hand, the temperature of air sent out by the common indoor unit is not too high, and on the other hand, human body induction is not cool. Therefore, the indoor units installed in a matching manner in a general multi-split system are all installed with indoor units (ordinary indoor units) of ordinary indoor return air or indoor units (fresh air machines) of outdoor ambient air. Because the multi-connected outdoor unit can be matched with a plurality of indoor units, if the problem that the indoor units are provided with the new fans and the common air duct machines can be solved, the system can have the functions of all the multi-connected units, and meanwhile, because the new fans and the air duct machines share one multi-connected outdoor unit, two sets of systems do not need to be installed, and the equipment investment and the installation cost can be greatly reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a multi-split system and a control method, wherein an indoor unit of the multi-split system can be independently matched with a new fan, can also be independently matched with a common air duct machine, can also be mixed and matched with the new fan and the common air duct machine, ensures the refrigerant distribution of the new fan and the common indoor unit, and ensures that air sent out by the new fan and the common air duct machine has better comfort.
In order to achieve the above object, the present invention provides a method for controlling a hybrid multiple on-line system, where the multiple on-line system includes an outdoor unit and an indoor unit including a plurality of indoor units, each indoor unit is configured with an electronic expansion valve, and each indoor unit can be switched between operating modes of a common air duct unit or a new air duct unit as required; an inlet temperature sensor and an outlet temperature sensor are respectively arranged at the inlet position and the outlet position of the heat exchanger of each indoor unit so as to respectively obtain the inlet temperature TA and the outlet temperature TB of the heat exchanger;
the control method comprises the following steps:
step A, when each indoor unit is powered on and initially operates, based on the capacity condition of the indoor unit and the current working mode, calculating and determining the initial opening and the opening adjusting range of an electronic expansion valve of the indoor unit;
b, each indoor unit which is electrified and initially operated firstly adjusts the electronic expansion valve of the indoor unit to a target opening degree within an opening degree adjusting range correspondingly according to the difference value between the heat exchanger inlet temperature TA and the heat exchanger outlet temperature TB which are obtained in real time and by taking the initial opening degree as a start;
and C, correspondingly adjusting the electronic expansion valve of the indoor unit to the target opening degree within the opening degree adjusting range on the basis of the difference value between the real heat exchanger inlet temperature TA and the real heat exchanger outlet temperature TB acquired in real time by the primarily adjusted indoor unit and the target opening degree after the previous adjustment, and repeating the step C until the difference value between the real heat exchanger inlet temperature TA and the real heat exchanger outlet temperature TB acquired in real time is within the preset range, so that each indoor unit keeps the target opening degree after the previous adjustment to continuously and stably operate.
Further, during the stable operation of the multi-split air conditioner system, each indoor unit in the working mode of the common air duct machine takes the detected and obtained real heat exchanger inlet temperature TA/real heat exchanger outlet temperature TB as a real temperature value T1, each indoor unit in the working mode of the new air duct machine takes the preset virtual heat exchanger outlet temperature TC/virtual heat exchanger inlet temperature TD as a virtual temperature value T2, and the average value T0 is calculated and confirmed by combining each real temperature value T1 and the virtual temperature value T2, so that each indoor unit in the operating state correspondingly adjusts the opening degree of the electronic expansion valve according to the real heat exchanger outlet temperature TA/real heat exchanger inlet temperature TB or the temperature difference between the virtual heat exchanger outlet temperature TC/virtual heat exchanger inlet temperature TD and the average value T0.
The method for controlling a hybrid collocation multi-split system according to claim 2, wherein: the virtual heat exchanger outlet temperature TC/virtual heat exchanger inlet temperature TD is the average value T1/average value T2 calculated and confirmed in the previous detection step.
Further, when the multi-split air conditioning system is initially powered on and operated, the outlet temperature TB of the first virtual heat exchanger/the inlet temperature TD of the virtual heat exchanger is a preset rated temperature value.
Further, when the multi-split system is in a cooling operation mode, the rated temperature value is 9 ℃.
Further, when the multi-split air-conditioning system is in the heating operation mode, the rated temperature value is 44 ℃.
Further, when the multi-split air-conditioning system is in a refrigeration running mode, a multi-stage refrigeration difference range is pre-divided to be used as a reference for a difference value between the outlet temperature TB of the heat exchanger and the inlet temperature TA of the heat exchanger, each stage of refrigeration difference value corresponds to an opening degree adjusting value, and according to the refrigeration difference range corresponding to the difference value between the outlet temperature TB of the heat exchanger and the inlet temperature TA of the heat exchanger determined by current calculation, the electronic expansion valve is adjusted to a new target opening degree by combining the corresponding opening degree adjusting value from an initial opening degree or a target opening degree after last adjustment.
Further, the refrigeration difference range comprises the following steps: the range of the first-stage refrigeration difference value is 4-7, and the corresponding opening adjustment value is 0 pulse; the range of the difference value of the second-stage refrigeration is 7-10, and the corresponding opening adjustment value is 4 pulses; the range of the difference value of the third-stage refrigeration is 2-4, and the corresponding opening adjustment value is-4 pulses; the range of the fourth-stage refrigeration difference value is 10-15, and the corresponding opening adjustment value is 8 pulses; the difference range of the fifth stage refrigeration is-1-2, and the corresponding opening degree adjustment value is-8 pulses; the range of the sixth-stage refrigeration difference is 15 to infinity, and the corresponding opening adjustment value is 16 pulses; the range of the difference value of the seventh refrigeration is-infinity to-1, and the corresponding opening degree adjustment value is-16 pulses.
Further, when the multi-split air-conditioning system is in a heating operation mode, a multi-level heating difference range is pre-divided to be used as a reference for a difference value between a heat exchanger inlet temperature TA and a heat exchanger outlet temperature TB, each level of heating difference corresponds to an opening degree adjusting value, and according to the heating difference range corresponding to the difference value between the heat exchanger inlet temperature TA and the heat exchanger outlet temperature TB determined by current calculation, the electronic expansion valve is adjusted to a new target opening degree by combining the corresponding opening degree adjusting value from an initial opening degree or a target opening degree after last adjustment.
Further, the heating difference range comprises the following series: the range of the first-stage heating difference value is 5-8, and the corresponding opening degree adjustment value is 0 pulse; the range of the second-stage heating difference value is 5-8, and the corresponding opening adjustment value is-4 pulses; the range of the third-stage heating difference value is 3-5, and the corresponding opening adjustment value is 4 pulses; the range of the fourth-stage heating difference value is 8-10, and the corresponding opening degree adjustment value is-8 pulses; the fifth-stage heating difference range is-1-3, and the corresponding opening degree adjustment value is 8 pulses; the range of the sixth-level heating difference is 15 to infinity, and the corresponding opening adjustment value is-16 pulses; the seventh heating difference range is-infinity to-1, and the corresponding opening adjustment value is 16 pulses.
The invention adopts the scheme, and has the beneficial effects that: the novel air blower and the common air duct machine are mixed in the same multi-split system, reasonable refrigerant regulation of the indoor machine is realized by reasonably and accurately dynamically adjusting the opening of the electronic expansion valve of the indoor machine, so that the air outlet temperature of the novel air blower and the air outlet temperature of the common air duct machine are ensured, and the comfortable air supply temperature of the novel air blower and the common air duct machine is achieved.
Drawings
Fig. 1 is a schematic view of a multi-split system of the present invention.
Fig. 2 is a flow chart illustrating a refrigerant distribution control method according to the present invention.
Fig. 3 is a schematic diagram of the refrigeration difference range of the present invention.
FIG. 4 is a schematic diagram of the heating difference range according to the present invention.
The system comprises an outdoor unit 1, an indoor unit 2 and an electronic expansion valve 21.
Detailed Description
To facilitate an understanding of the invention, the invention is described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1 to 4, the multi-split system of the present embodiment includes an outdoor unit 1 and indoor unit 2 groups consisting of a plurality of indoor units 2, wherein each of the indoor units 2 is configured with an electronic expansion valve 21, that is, two ends of each of the indoor unit 2 groups connected in parallel are respectively connected to the outdoor unit 1, and the electronic expansion valve 21 is disposed between one end of each of the indoor units 2 and the indoor unit 2. Each indoor unit 2 can be switched between the working modes of the common air duct machine or the new fan as required, that is, the indoor unit 2 can be correspondingly switched to the working mode of the common air duct machine or the new fan according to the corresponding requirement selected by a user.
Further, an inlet temperature sensor and an outlet temperature sensor are mounted at the inlet position and the outlet position of the heat exchanger of each indoor unit 2, and the inlet temperature sensors are used for detecting and acquiring the inlet temperature TA of the heat exchanger of each indoor unit 2; the outlet temperature sensor is used for detecting and acquiring the outlet temperature TB of the heat exchanger of the indoor unit 2.
For ease of understanding, the following description will be made in conjunction with the control method of the present embodiment.
In the control method of the hybrid multiple on-line system according to the embodiment, the operation state of the multiple on-line system, the operation number of the indoor units 2 in power-on operation, and the working mode corresponding to each indoor unit 2 are detected at regular intervals, and then the opening of the electronic expansion valve 21 of each indoor unit 2 in power-on operation is correspondingly adjusted according to the detection condition.
The control method in the embodiment specifically comprises the following steps:
step A, when each indoor unit 2 initially operates in a power-on state, based on the capacity condition of the indoor unit 2 and the current working mode, calculating and determining the initial opening degree and the opening degree adjusting range of the electronic expansion valve 21 of the indoor unit 2;
therefore, in the cooling operation state, the initial opening degree and the openability adjustment range of the electronic expansion valve 21 of the indoor unit 2 switched to the ordinary ducted air conditioner are as follows: (the maximum opening of the electronic expansion valve 21 of this embodiment is 500 pulses, and the adjustment can be made according to the actual production requirement)
| Capacity condition of common ducted air conditioner | Initial opening degree | Minimum regulating opening degree | Maximum regulating opening degree |
| |
400 | 200 | 480 |
| |
400 | 200 | 480 |
| 7.1KW < |
400 | 200 | 480 |
| 3.6KW < |
300 | 152 | 400 |
| 1.0KW < |
200 | 112 | 400 |
In the cooling operation state, when the indoor unit 2 is switched to the new fan, the initial opening and the openability adjustment range of the electronic expansion valve 21 are as follows:
| power condition of fresh air machine | Initial opening degree | Minimum regulating opening degree | Maximum regulating opening degree |
| |
304 | 152 | 304 |
| |
304 | 152 | 304 |
| 7.1KW < |
304 | 152 | 304 |
| 3.6KW < |
200 | 112 | 200 |
| 1.0KW < |
152 | 96 | 152 |
In the heating operation state, the initial opening degree and the openability adjustment range of the electronic expansion valve 21 of the indoor unit 2 switched to the ordinary ducted air conditioner are as follows: (the maximum opening of the electronic expansion valve 21 of this embodiment is 500 pulses, and the adjustment can be made according to the actual production requirement)
| Capacity condition of common ducted air conditioner | Initial opening degree | Minimum regulating opening degree | Maximum regulating opening degree |
| |
400 | 200 | 480 |
| |
400 | 200 | 480 |
| 7.1KW < |
400 | 200 | 480 |
| 3.6KW < |
400 | 144 | 480 |
| 1.0KW < |
400 | 144 | 480 |
In the heating operation state, when the indoor unit 2 is switched to the new fan, the initial opening and the openability adjustment range of the electronic expansion valve 21 are as follows:
| capacity of the |
Initial opening degree | Minimum regulating opening degree | Maximum regulating opening degree |
| |
300 | 152 | 300 |
| |
300 | 152 | 300 |
| 7.1KW < |
300 | 152 | 300 |
| 3.6KW < |
248 | 112 | 248 |
| 1.0KW < |
200 | 96 | 200 |
B, each indoor unit 2 which is electrified and initially operated firstly adjusts the electronic expansion valve 21 of the indoor unit 2 to a target opening degree within an opening degree adjusting range correspondingly according to the difference value between the heat exchanger inlet temperature TA and the heat exchanger outlet temperature TB which are obtained in real time and by taking the initial opening degree as a start;
and C, correspondingly adjusting the electronic expansion valve 21 of the indoor unit 2 to a target opening degree within an opening degree adjusting range on the basis of the difference value between the real heat exchanger inlet temperature TA and the real heat exchanger outlet temperature TB acquired in real time of the indoor unit 2 after the initial adjustment and the target opening degree after the previous adjustment, and repeating the step C until the difference value between the real heat exchanger inlet temperature TA and the real heat exchanger outlet temperature TB acquired in real time of each indoor unit 2 is within a preset range, so that each indoor unit 2 keeps the target opening degree after the previous adjustment to continuously and stably operate.
Further, in steps B and C, a multi-stage refrigeration difference range and a multi-stage heating difference range are correspondingly divided according to the operation mode of the multi-split air-conditioning system, wherein the multi-stage refrigeration difference range is pre-divided to be referred to as a difference value between the heat exchanger outlet temperature TB and the heat exchanger inlet temperature TA when the multi-split air-conditioning system is in the refrigeration operation mode, each stage of refrigeration difference value corresponds to an opening degree adjustment value, and the refrigeration difference value range corresponding to the difference value (TB-TA) between the heat exchanger outlet temperature TB and the heat exchanger inlet temperature TA determined by the current calculation is used, so that the electronic expansion valve 21 is adjusted to a new target opening degree by combining the corresponding opening degree adjustment value from the initial opening degree or the target opening degree after the previous adjustment. Referring to FIG. 3, a refrigeration difference range includes the following steps:
the range of the first-stage refrigeration difference value is 4-7, and the corresponding opening adjustment value is 0 pulse;
the range of the difference value of the second-stage refrigeration is 7-10, and the corresponding opening adjustment value is 4 pulses;
the range of the difference value of the third-stage refrigeration is 2-4, and the corresponding opening adjustment value is-4 pulses;
the range of the fourth-stage refrigeration difference value is 10-15, and the corresponding opening adjustment value is 8 pulses;
the difference range of the fifth stage refrigeration is-1-2, and the corresponding opening degree adjustment value is-8 pulses;
the range of the sixth-stage refrigeration difference is 15 to infinity, and the corresponding opening adjustment value is 16 pulses;
the range of the difference value of the seventh refrigeration is-infinity to-1, and the corresponding opening degree adjustment value is-16 pulses.
When the multi-split air-conditioning system is in a heating operation mode, a multi-level heating difference range is pre-divided to be used as a reference for a difference value between a heat exchanger inlet temperature TA and a heat exchanger outlet temperature TB, each level of heating difference value corresponds to an opening degree adjusting value, and according to the heating difference range corresponding to the difference value (TA-TB) between the heat exchanger inlet temperature TA and the heat exchanger outlet temperature TB confirmed by current calculation, the electronic expansion valve 21 is enabled to adjust the electronic expansion valve 21 to a new target opening degree by combining the corresponding opening degree adjusting value from an initial opening degree or a target opening degree after last adjustment. Referring to FIG. 4, the heating differential range includes the following steps:
the range of the first-stage heating difference value is 5-8, and the corresponding opening degree adjustment value is 0 pulse;
the range of the second-stage heating difference value is 8-10, and the corresponding opening adjustment value is-4 pulses;
the range of the third-stage heating difference value is 3-5, and the corresponding opening adjustment value is 4 pulses;
the fourth-stage heating difference range is 10-15, and the corresponding opening degree adjustment value is-8 pulses;
the fifth-stage heating difference range is-1-3, and the corresponding opening degree adjustment value is 8 pulses;
the range of the sixth-level heating difference is 15 to infinity, and the corresponding opening adjustment value is-16 pulses;
the seventh heating difference range is-infinity to-1, and the corresponding opening adjustment value is 16 pulses.
In this embodiment, during the steady operation of the multi-split air-conditioning system (i.e., the steady operation is adjusted to 10min through step C), each indoor unit 2 in the normal air-conditioning unit operating mode takes the detected and obtained real heat exchanger inlet temperature TA/real heat exchanger outlet temperature TB as the real temperature value T1, each indoor unit 2 in the new air-conditioning unit operating mode takes the predetermined virtual heat exchanger outlet temperature TC/virtual heat exchanger inlet temperature TD as the virtual temperature value T2, and the confirmation average value T0 is calculated by combining each real temperature value T1 and the virtual temperature value T2, therefore, the opening degree of the electronic expansion valve 21 of each indoor unit 2 in the running state is correspondingly adjusted according to the temperature difference value between the real heat exchanger outlet temperature TA/the real heat exchanger inlet temperature TB or the virtual heat exchanger outlet temperature TC/the virtual heat exchanger inlet temperature TD and the average value T0.
Further, in the cooling operation mode, the opening degree of the electronic expansion valve 21 of the indoor unit 2 in the working mode of the ordinary duct machine is correspondingly adjusted based on the temperature difference value between the real heat exchanger outlet temperature TA and the average value T0; and for the indoor unit 2 in the working mode of the fresh air machine, the opening degree of the electronic expansion valve 21 is correspondingly adjusted based on the temperature difference value between the virtual heat exchanger outlet temperature TC and the average value T0. Specifically, the following are divided:
1) when the real heat exchanger outlet temperature TA/virtual heat exchanger outlet temperature TC-average value T0 > the first temperature difference K1 (TA/TC-T0 > K1, where K1 is preferably 0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 increases the opening degree (preferably increases 8 pulsations) based on the current opening degree;
2) when the first temperature difference K1 is more than or equal to the real heat exchanger outlet temperature TA/the virtual heat exchanger outlet temperature TC-average value T0 is more than or equal to the second temperature difference K2 (K1 is more than or equal to TA/TC-T0 is more than or equal to K2, and K2 is preferably-0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 maintains the current opening degree;
3) when the first temperature difference K1 > the real heat exchanger outlet temperature TA/the virtual heat exchanger outlet temperature TC-the mean value T0 (K2 > TA/TC-T0, K2 is preferably-0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 is decreased in opening degree (preferably by 8 pulses) on the basis of the current opening degree.
In addition, if the electronic expansion valve 21 of the indoor unit 2 has been adjusted to the maximum or minimum opening degree, the operation is continued with the opening degree thereof maintained at the maximum or minimum opening degree.
Further, in the heating mode, the opening degree of the electronic expansion valve 21 of the indoor unit 2 in the working mode of the ordinary duct machine is correspondingly adjusted based on the temperature difference value between the actual heat exchanger inlet temperature TB and the average value T0; and for the indoor unit 2 in the working mode of the fresh air machine, the opening degree of the electronic expansion valve 21 is correspondingly adjusted based on the temperature difference value between the virtual heat exchanger inlet temperature TD and the average value T0. Specifically, the following are divided:
1) when the real heat exchanger middle temperature TC/the virtual heat exchanger inlet temperature TD-average value T0 is greater than the first temperature difference K1 (TC/TD-T0 is greater than K1, where K1 is preferably 0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 is reduced in opening degree (preferably reduced in 8 pulsations) based on the current opening degree;
2) when the first temperature difference K1 is more than or equal to the real heat exchanger middle temperature TC/the virtual heat exchanger inlet temperature TD-average value T0 is more than or equal to the second temperature difference K2 (K1 is more than or equal to TC/TD-T0 is more than or equal to K2, and K2 is preferably-0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 maintains the current opening degree;
3) when the first temperature difference K1 > the real heat exchanger middle temperature TC/the virtual heat exchanger inlet temperature TD-the average value T0 (K2 > TC/TD-T0, K2 is preferably-0.5 ℃), the electronic expansion valve 21 of the indoor unit 2 is increased in opening degree (preferably by 8 pulses) based on the current opening degree.
In addition, if the electronic expansion valve 21 of the indoor unit 2 has been adjusted to the maximum or minimum opening degree, the operation is continued with the opening degree thereof maintained at the maximum or minimum opening degree.
In this embodiment, the indoor unit 2 in the normal air-duct machine only uploads the actual heat exchanger outlet temperature TA or the actual heat exchanger inlet temperature TB detected by itself as the content of the average value calculation under any condition, and the indoor unit 2 in the fresh air duct only adopts the virtual heat exchanger outlet temperature TC or the virtual heat exchanger inlet temperature TD as the content of the average value calculation, wherein the virtual heat exchanger outlet temperature TC/the virtual heat exchanger inlet temperature TD in this embodiment is the average value T0 calculated and confirmed in the previous detection step, that is, the virtual heat exchanger outlet temperature TC corresponds to the average value T1 calculated and confirmed in the previous detection step in the cooling operation state, and the virtual heat exchanger inlet temperature TD corresponds to the average value T0 calculated and confirmed in the previous detection step in the heating operation state, so that, after the average value T0 is calculated, and the temperature is transmitted back to the indoor unit 2 positioned in the new fan to be used as the outlet temperature TC of the virtual heat exchanger/the inlet temperature TD of the virtual heat exchanger, so that the next detection step calculates the next average value, and the steps are circulated in sequence.
Further, when the multi-split air-conditioning system is initially powered on and operated, the outlet temperature TC/inlet temperature TD of the first virtual heat exchanger is a preset rated temperature value, wherein when the multi-split air-conditioning system is in a refrigeration operation mode, the rated temperature value is 9 ℃. When the multi-split air-conditioning system is in a heating operation mode, the rated temperature value is 44 ℃.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to limit the present invention in any way. Those skilled in the art can make many changes, modifications, and equivalents to the embodiments of the invention without departing from the scope of the invention as set forth in the claims below. Therefore, equivalent changes made according to the spirit of the present invention should be covered within the protection scope of the present invention without departing from the contents of the technical scheme of the present invention.
Claims (10)
1. A control method of a mixed and collocated multi-split system is characterized by comprising the following steps: the multi-split air conditioner system comprises an outdoor unit (1) and an indoor unit (2) group consisting of a plurality of indoor units (2), wherein each indoor unit (2) is provided with an electronic expansion valve (21), and each indoor unit (2) can be switched between the working modes of a common air duct machine or a new fan as required; an inlet temperature sensor and an outlet temperature sensor are respectively arranged at the inlet position and the outlet position of the heat exchanger of each indoor unit (2) so as to respectively obtain the inlet temperature TA and the outlet temperature TB of the heat exchanger;
the control method comprises the following steps:
step A, when each indoor unit (2) is initially operated at power-on, based on the capacity condition of the indoor unit (2) and the current working mode, calculating and determining the initial opening and the opening adjusting range of an electronic expansion valve (21) of the indoor unit (2);
b, each indoor unit (2) which is electrified and initially operated firstly adjusts the electronic expansion valve (21) of the indoor unit (2) to a target opening degree within an opening degree adjusting range correspondingly and initially according to the difference value between the heat exchanger inlet temperature TA and the heat exchanger outlet temperature TB which are obtained in real time and starting from the initial opening degree;
and C, correspondingly adjusting the electronic expansion valve (21) of the indoor unit (2) to a target opening degree within an opening degree adjusting range on the basis of the difference value between the real heat exchanger inlet temperature TA and the real heat exchanger outlet temperature TB acquired in real time of the primarily adjusted indoor unit (2) and the target opening degree after the previous adjustment, and repeating the step C until the difference value between the real heat exchanger inlet temperature TA and the real heat exchanger outlet temperature TB acquired in real time of each indoor unit is within a preset range, so that each indoor unit (2) keeps the target opening degree after the previous adjustment to continuously and stably operate.
2. The method for controlling a hybrid collocation multi-split system according to claim 1, wherein: during the stable operation of the multi-split air conditioner system, each indoor unit (2) in the working mode of the common air duct machine takes the detected and obtained real heat exchanger inlet temperature TA/real heat exchanger outlet temperature TB as a real temperature value T1, each indoor unit (2) in the working mode of the new air duct machine takes the preset virtual heat exchanger outlet temperature TC/virtual heat exchanger inlet temperature TD as a virtual temperature value T2, and the average value T0 is calculated and confirmed by combining each real temperature value T1 and the virtual temperature value T2, so that each indoor unit (2) in the operating state correspondingly adjusts the opening degree of the electronic expansion valve (21) according to the real heat exchanger outlet temperature TA/real heat exchanger inlet temperature TB or the temperature difference between the virtual heat exchanger outlet temperature TC/virtual heat exchanger inlet temperature TD and the average value T0.
3. The method for controlling a hybrid collocation multi-split system according to claim 2, wherein: the virtual heat exchanger outlet temperature TC/virtual heat exchanger inlet temperature TD is the average value T1/average value T2 calculated and confirmed in the previous detection step.
4. The method for controlling a hybrid collocation multi-split system according to claim 3, wherein: when the multi-split air conditioning system is initially powered on and operated, the outlet temperature TB of the first virtual heat exchanger/the inlet temperature TD of the virtual heat exchanger is a preset rated temperature value.
5. The method for controlling a hybrid collocation multi-split system according to claim 4, wherein: when the multi-split system is in a refrigeration operation mode, the rated temperature value is 9 ℃.
6. The method for controlling a hybrid collocation multi-split system according to claim 4, wherein: when the multi-split air-conditioning system is in a heating operation mode, the rated temperature value is 44 ℃.
7. The method for controlling a hybrid collocation multi-split system according to claim 1, wherein: and under the refrigeration running mode of the multi-split air conditioning system, a multi-stage refrigeration difference range is pre-divided to be used as a reference for the difference value of the heat exchanger outlet temperature TB-the heat exchanger inlet temperature TA, and each stage of refrigeration difference value corresponds to an opening degree adjusting value, wherein the electronic expansion valve (21) is adjusted to a new target opening degree by combining the corresponding opening degree adjusting value from the initial opening degree or the target opening degree after the last adjustment according to the refrigeration difference range corresponding to the difference value of the heat exchanger outlet temperature TB-the heat exchanger inlet temperature TA which is calculated and confirmed at the current time.
8. The method of controlling a hybrid collocation multi-split system according to claim 7, wherein: the refrigeration difference range comprises the following steps: the range of the first-stage refrigeration difference value is 4-7, and the corresponding opening adjustment value is 0 pulse; the range of the difference value of the second-stage refrigeration is 7-10, and the corresponding opening adjustment value is 4 pulses; the range of the difference value of the third-stage refrigeration is 2-4, and the corresponding opening adjustment value is-4 pulses; the range of the fourth-stage refrigeration difference value is 10-15, and the corresponding opening adjustment value is 8 pulses; the difference range of the fifth stage refrigeration is-1-2, and the corresponding opening degree adjustment value is-8 pulses; the range of the sixth-stage refrigeration difference is 15 to infinity, and the corresponding opening adjustment value is 16 pulses; the range of the difference value of the seventh refrigeration is-infinity to-1, and the corresponding opening degree adjustment value is-16 pulses.
9. The method for controlling a hybrid collocation multi-split system according to claim 1, wherein: when the multi-split air conditioning system is in a heating operation mode, a multi-level heating difference range is pre-divided to be used as a reference for a difference value between a heat exchanger inlet temperature TA and a heat exchanger outlet temperature TB, each level of heating difference corresponds to an opening degree adjusting value, and according to the heating difference range corresponding to the difference value between the heat exchanger inlet temperature TA and the heat exchanger outlet temperature TB determined by current calculation, the electronic expansion valve (21) is adjusted to a new target opening degree by combining the corresponding opening degree adjusting value from an initial opening degree or a target opening degree after last adjustment.
10. The method of controlling a hybrid collocation multi-split system according to claim 9, wherein: the heating difference range comprises the following steps: the range of the first-stage heating difference value is 5-8, and the corresponding opening degree adjustment value is 0 pulse; the range of the second-stage heating difference value is 5-8, and the corresponding opening adjustment value is-4 pulses; the range of the third-stage heating difference value is 3-5, and the corresponding opening adjustment value is 4 pulses; the range of the fourth-stage heating difference value is 8-10, and the corresponding opening degree adjustment value is-8 pulses; the fifth-stage heating difference range is-1-3, and the corresponding opening degree adjustment value is 8 pulses; the range of the sixth-level heating difference is 15 to infinity, and the corresponding opening adjustment value is-16 pulses; the seventh heating difference range is-infinity to-1, and the corresponding opening adjustment value is 16 pulses.
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