CN112594822B - Control method for simultaneously starting refrigeration and domestic hot water in multi-split air conditioner - Google Patents
Control method for simultaneously starting refrigeration and domestic hot water in multi-split air conditioner Download PDFInfo
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- CN112594822B CN112594822B CN202110083551.9A CN202110083551A CN112594822B CN 112594822 B CN112594822 B CN 112594822B CN 202110083551 A CN202110083551 A CN 202110083551A CN 112594822 B CN112594822 B CN 112594822B
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0096—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater combined with domestic apparatus
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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
- F24F11/80—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
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- 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
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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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
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/18—Details or features not otherwise provided for combined with domestic apparatus
- F24F2221/183—Details or features not otherwise provided for combined with domestic apparatus combined with a hot-water boiler
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Abstract
The invention discloses a control method for simultaneously starting refrigeration and domestic hot water of a multi-split air conditioner, when the multi-split air conditioner is started and has the requirements of hydraulic modules for heating water and indoor module refrigeration, the water inlet temperature Tin of each group of hydraulic modules in the water heating state is obtained according to real-time monitoring, and the multi-split air conditioner correspondingly controls a mode A or a mode B, wherein when the minimum water temperature value in each water inlet temperature Tin of each group of hydraulic modules is higher than the preset temperature, the mode B is started; on the contrary, when the minimum water temperature value in the water inlet temperatures Tin of all the groups of hydraulic modules is lower than the preset temperature, the mode A is started; the outdoor heat exchanger is reasonably controlled to be used as a condenser or an evaporator according to the water inlet temperature Tin, and the opening condition of an expansion valve of the outdoor unit is reasonably controlled, so that the effects of refrigerating and heating water are ensured, and the reliability and the stability of the system are effectively ensured.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method for simultaneously starting refrigeration and domestic hot water in a multi-split air conditioner.
Background
In the multi-split air-conditioning indoor unit and hydraulic module combined heat recovery multi-split system, when the system is in a heat recovery mode in which air-conditioning refrigeration and hot water are simultaneously started, on one hand, the refrigeration effect of the air-conditioning indoor unit and the heating effect of the hydraulic module are required to be ensured, and the safety and reliability of the system are also required to be considered. Because the number of the indoor units of the air conditioner in the multifunctional multi-split system is more, the indoor units are different in size, the number of the hydraulic modules for opening the water heating system is not constant, and in addition, the water temperature of the domestic hot water is continuously increased, so that the hydraulic modules have large capacity requirements when the water temperature is low, and have small capacity requirements when the water temperature is high, and therefore, the refrigerating capacity requirements and the water module heating capacity requirements of the indoor units of the air conditioner are dynamically changed. In the multifunctional multi-split air-conditioning system, when the air-conditioning indoor unit is in a refrigeration mode and the hydraulic module is in a domestic hot water making mode, the refrigeration requirement of the air-conditioning indoor unit and the heating requirement of domestic hot water at the moment of the outdoor unit heat exchanger can be used as a condenser or an evaporator, and meanwhile, the opening degree of an electronic expansion valve of the outdoor unit and the opening degree of an electronic expansion valve of the air-conditioning indoor unit are required to be adjusted to reasonably distribute the flow of a refrigerant to the outdoor unit heat exchanger or the air-conditioning indoor unit heat exchanger.
Based on the above, in the multifunctional multiple on-line system, when the mode of the system is the heat recovery mode in which the air conditioner performs cooling and the hot water is simultaneously turned on, in order to ensure the cooling effect of the indoor unit of the air conditioner, the heating effect of the hydraulic module and the reliability of the system, it is very complicated and difficult to control the state of the heat exchanger of the outdoor unit and to control the refrigerant distribution flow.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a control method for simultaneously starting refrigeration and domestic hot water in a multi-split air conditioner.
In order to achieve the above object, the control method for simultaneously starting refrigeration and domestic hot water in a multi-split air conditioner provided by the present invention comprises an outdoor unit, at least one group of hydraulic modules and at least one group of indoor modules, wherein the outdoor unit is respectively connected with each group of indoor modules through a liquid pipe and a high-low pressure air pipe, and the outdoor unit is respectively connected with each group of hydraulic modules through a liquid pipe, a high-low pressure air pipe and a high-pressure air pipe; the outdoor unit comprises a compressor, a first four-way valve, a second four-way valve and an outdoor heat exchanger, an outdoor unit expansion valve is arranged on the liquid pipe, and a first electromagnetic valve and a second electromagnetic valve are respectively arranged on the high-pressure air pipe and the high-low pressure air pipe; the control method for simultaneously starting refrigeration and domestic hot water comprises a mode A and a mode B, wherein in the mode A, a first four-way valve and a second four-way valve are powered off, a first electromagnetic valve is opened, and a second electromagnetic valve is closed; in the mode B, the first four-way valve is powered on, the second four-way valve is powered off, the first electromagnetic valve is opened, and the second electromagnetic valve is closed;
the selective switching of the multi-split air conditioner in the mode A or the mode B comprises the following steps: when the multi-split air conditioner is started and has the requirements of hydraulic module hot water production and indoor module refrigeration, the water inlet temperature Tin of each group of hydraulic modules in the hot water production state is acquired according to real-time monitoring, and the multi-split air conditioner correspondingly controls the operation mode A or the operation mode B, wherein when the minimum water temperature value in the water inlet temperature Tin of each group of hydraulic modules is higher than the preset temperature, the mode A is started; and conversely, when the minimum water temperature value in the water inlet temperatures Tin of the hydraulic modules is lower than the preset temperature, the mode B is started.
Further, when only one group of hydraulic modules is in a hot water making state, the water inlet temperature Tin of the hydraulic modules is used as the minimum water temperature value to be compared and judged with the preset temperature.
Further, the multi-split air conditioner is in the operation period of simultaneously refrigerating and heating water, the outlet water temperature Tout of each group of hydraulic modules in the heating water state is monitored and obtained in real time, when the outlet water temperature Tout of any one group of hydraulic modules is monitored to be higher than a preset high-temperature protection value, the multi-split air conditioner is forcibly switched to the mode A to operate, and after all the outlet water temperatures Tout are equal to or lower than the preset high-temperature protection value, the inlet water temperature Tin of each group of hydraulic modules in the heating water state is obtained based on real-time monitoring again to correspondingly control the multi-split air conditioner operation mode A or the mode B.
Further, during the starting mode A of the multi-split air conditioner, the opening degree of the outdoor unit expansion valve is adjusted according to the minimum water temperature value in the inlet water temperature Tin of each group of hydraulic modules obtained through real-time monitoring, wherein the larger the minimum water temperature value is, the smaller the opening degree of the outdoor unit expansion valve is.
Further, during the starting mode A, a five-stage first water temperature range is divided in advance based on the minimum water temperature value, wherein the first-stage first water temperature range is 0-35 ℃, and the opening value corresponding to the outdoor unit expansion valve is 300P; the second-stage first water temperature range is 32-40 ℃, and the opening degree value corresponding to the outdoor unit expansion valve is 250P; the three-stage first water temperature range is 40-45 ℃, and the opening degree value corresponding to the outdoor unit expansion valve is 200P; the first water temperature range of the four stages is 45-50 ℃, and the opening degree value corresponding to the outdoor unit expansion valve is 150P; the first water temperature range of the fifth grade is 50 to infinity ℃, and the corresponding opening degree value of the outdoor unit expansion valve is 100P.
Further, during the starting mode B of the multi-split air conditioner, the opening degree of the outdoor unit expansion valve is adjusted according to the minimum water temperature value in the inlet water temperature Tin of each group of hydraulic modules obtained through real-time monitoring, wherein the smaller the minimum water temperature value is, the larger the opening degree of the outdoor unit expansion valve is.
Further, during the starting mode B, a fifth-stage second water temperature range is divided in advance based on the minimum water temperature value, wherein the first-stage second water temperature range is 0-35 ℃, and the opening value corresponding to the outdoor unit expansion valve is 100P; the second-stage second water temperature range is 32-40 ℃, and the opening degree value corresponding to the outdoor unit expansion valve is 150P; the third-stage second water temperature range is 40-45 ℃, and the opening degree value corresponding to the outdoor unit expansion valve is 200P; the fourth-stage second water temperature range is 45-50 ℃, and the opening degree value corresponding to the outdoor unit expansion valve is 250P; the fifth-level second water temperature range is 50 to infinity, and the corresponding opening degree value of the outdoor unit expansion valve is 300P.
Further, the preset temperature is 45 ℃.
Further, the preset high temperature protection value is 55 DEG C
The invention adopts the scheme, and has the beneficial effects that: when the refrigeration and heating water is simultaneously opened, whether the outdoor heat exchanger is used as a condenser or an evaporator can be reasonably controlled according to the water inlet temperature Tin, and the opening condition of an expansion valve of the outdoor unit is reasonably controlled, so that the refrigeration and heating water effects are ensured, and the reliability and stability of the system are effectively ensured.
Drawings
Fig. 1 is a schematic diagram illustrating a connection configuration of a multi-split system.
Fig. 2 is a control flow chart.
FIG. 3 is a schematic diagram of the inlet water temperature range for mode selection.
Fig. 4 is a schematic diagram of the water outlet temperature range of the mode switching.
Fig. 5 is a schematic diagram of a first water temperature range of mode a.
Fig. 6 is a schematic diagram of a second water temperature range of mode B.
The system comprises 100-outdoor unit, 200-hydraulic module, 300-indoor module, 1-compressor, 2-first four-way valve, 3-second four-way valve, 4-outdoor heat exchanger, 5-oil separator, 6-gas-liquid separator, 7-liquid pipe, 8-high-low pressure gas pipe, 9-high pressure gas pipe, 10-hydraulic heat exchanger, 12-outdoor unit expansion valve, 13-first electromagnetic valve and 14-second electromagnetic valve.
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 and 2, in the present embodiment, a multi-split air conditioner includes an outdoor unit 100, at least one set of hydro modules 200, and at least one set of indoor modules 300, wherein the outdoor unit 100 includes a compressor 1, a first four-way valve 2, a second four-way valve 3, an outdoor heat exchanger 4, an oil separator 5, and a gas-liquid separator 6, and each of the first four-way valve 2 and the second four-way valve 3 includes C, D, E, S four interfaces. The output end of the compressor 1 is respectively connected with a D interface of the first four-way valve 2 and a D interface of the second four-way valve 3 through an oil separator 5, the input end of the compressor 1 is connected with an S interface of the first four-way valve 2 and an S interface of the second four-way valve 3 through a gas-liquid separator 6, a C interface of the first four-way valve 2 is connected with one end of an outdoor heat exchanger 4, and an E interface of the first four-way valve 2 is connected with a C interface of the second four-way valve connected with the S interface of the second four-way valve 3 through a throttling unit and is connected with the S interface of the first four-way valve 2 through a throttling unit.
Further, when the first four-way valve 2 is powered down, the interface D is communicated with the interface C, the interface E is communicated with the end S, and when the first four-way valve 2 is powered on, the interface D is communicated with the interface E.
Further, when the second four-way valve 3 is powered off, the D interface is conducted with the C interface, the E interface is conducted with the S interface, and due to the fact that the C interface is connected through the capillary tube, actually, the refrigerant throughput is little, namely, no refrigerant passes through from the D interface to the C end. When the second four-way valve 3 is powered on, the D interface is communicated with the E interface, and the C interface is communicated with the S interface.
In this embodiment, the outdoor unit is connected to each set of indoor modules 300 through a liquid pipe 7 and a high-low pressure gas pipe 8, respectively, and is connected to each set of hydro modules 200 through a liquid pipe 7, a high-low pressure gas pipe 8, and a high-pressure gas pipe 9, respectively, specifically, one end of the liquid pipe 7 is connected to the outdoor heat exchanger 4, and the other end of the liquid pipe 7 is connected to the other end of the hydro heat exchanger 10 and the other end of the indoor heat exchanger 11, respectively. An E interface of the second four-way valve 3 is connected with one end of a high-low pressure air pipe 8, and the other end of the high-low pressure air pipe 8 is respectively connected with one end of a hydraulic heat exchanger 10 and one end of an indoor heat exchanger 11 through a branch pipe. One end of the high-pressure air pipe 9 is connected between the four-way valve and the output end of the compressor 1 in a bypass mode, and the other end of the high-pressure air pipe 9 is connected with one end of the hydraulic heat exchanger 10.
Further, a first electromagnetic valve 13 is arranged on a pipeline between the high-pressure air pipe 9 and any one hydraulic heat exchanger 10; and a second electromagnetic valve 14 is arranged on a pipeline between the high-low pressure air pipe 8 and each hydraulic heat exchanger 10.
Further, an outdoor expansion valve 12 is disposed at an end of the liquid pipe 7 adjacent to the heat exchanger.
Based on the multi-split air conditioning system, the control method for simultaneously turning on the refrigeration and the domestic hot water is further explained below.
A control method for simultaneously starting refrigeration and domestic hot water in a multi-split air conditioner comprises a mode A and a mode B, wherein in the mode A, a first four-way valve 2 and a second four-way valve 3 are powered off, a first electromagnetic valve 13 is opened, and a second electromagnetic valve 14 is closed; in the mode B, the first four-way valve 2 is energized, the second four-way valve 3 is de-energized, the first solenoid valve 13 is opened, and the second solenoid valve 14 is closed.
Specifically, the mode a is suitable for the case where the cooling demand of the indoor module 300 is large and the heating demand of the hydro module 200 is small, and the outdoor heat exchanger 4 is used as a condenser. At this time, the first four-way valve 2 and the second four-way valve 3 are powered off, the first solenoid valve 13 is opened, and the second solenoid valve 14 is closed. The high-temperature and high-pressure refrigerant discharged by the compressor 1 is divided into two parts, one part of the high-temperature and high-pressure refrigerant enters the outdoor heat exchanger 4 through the first four-way valve 2, is condensed and enters the liquid inlet pipe 7 through the outdoor expansion valve 12, the other part of the high-pressure refrigerant enters the hydraulic module 200 through the high-pressure air pipe 9, is condensed and releases heat and then enters the liquid inlet pipe 7, the two parts of the refrigerant after condensation and heat release are mixed in the liquid inlet pipe 7 and enter the indoor module 300 together for evaporation, and then the refrigerant after evaporation and heat absorption flows back to the compressor 1 through the high-pressure and low-pressure air pipe 8 to complete circulation. In this case, the outdoor heat exchanger 4 serves as a condenser, the indoor heat exchanger of the indoor module 300 serves as an evaporator, and the hydro heat exchanger 10 of the hydro module 200 serves as a condenser.
Specifically, the mode B is suitable for the case where the indoor module 300 has a small refrigeration demand and the hydraulic module 200 has a large heating demand, and at this time, the first four-way valve 2 is powered on, the second four-way valve 3 is powered off, the first solenoid valve 13 is opened, and the second solenoid valve 14 is closed. High-temperature and high-pressure refrigerant discharged by the compressor 1 enters the water conservancy module through the high-pressure air pipe 9 to be condensed and released heat, then is divided into two parts in the liquid inlet pipe 7, one part of the refrigerant enters the outdoor heat exchanger 4 through the outdoor expansion valve 12 to be evaporated and absorbed heat and then flows back to the compressor 1 through the first four-way valve 2, and the other part of the refrigerant enters the indoor module 300 to be evaporated and absorbed heat and then flows back to the compressor 1 through the high-pressure and low-pressure air pipe 8 to complete circulation.
In this embodiment, the switching of the multiple online units between the mode a and the mode B includes the following steps:
referring to fig. 3, when the multi-split air conditioner is turned on and has the water power modules 200 to produce hot water and the indoor modules 300 to refrigerate, the water inlet temperature Tin of each group of water power modules 200 in the state of producing hot water is obtained according to real-time monitoring, and the multi-split air conditioner correspondingly controls the operation mode a or the operation mode B, wherein when the minimum water temperature value of each water inlet temperature Tin of each group of water power modules 200 is higher than the preset temperature, the operation mode a is started; conversely, when the minimum water temperature value among the respective water inflow temperatures Tin of the respective sets of hydro modules 200 is equal to or lower than the preset temperature, the mode B is enabled. The preset temperature for this embodiment is preferably 45 deg.c.
Specifically, when only one group of hydraulic modules 200 is in a hot water state, the inlet water temperature Tin of the hydraulic module 200 is monitored and obtained as the minimum water temperature value. When a plurality of groups of hydraulic modules 200 are in a hot water making state, the inlet water temperature Tin of each group of hydraulic modules 200 is monitored and obtained, and the inlet water temperature Tin is compared in size to determine the minimum water temperature value.
In this embodiment, during the operation period of the multi-split air conditioner in which cooling and heating water are simultaneously performed, the outlet water temperature Tout of each group of hydraulic modules 200 in the heating water state is obtained through real-time monitoring, wherein when the outlet water temperature Tout of any one group of hydraulic modules 200 is monitored to be higher than a preset high-temperature protection value, the multi-split air conditioner is forcibly switched to the mode a to operate until each outlet water temperature Tout is equal to or lower than the preset high-temperature protection value, and the inlet water temperature Tin of each group of hydraulic modules 200 in the heating water state is obtained through real-time monitoring again to correspondingly control the multi-split air conditioner operation mode a or the mode B. Specifically, referring to fig. 4, when any one of the outlet water temperatures Tout is greater than 55 ℃, the operation mode a is forcibly switched by the multi-split system, so that the water temperature of the hydraulic module is prevented from being too high, and the reliability of the operation of the system is ensured. A
In the present embodiment, the opening degree control method for the outdoor unit expansion valve 12 differs between the mode a and the mode B.
Specifically, during the on-mode a of the multi-split air conditioner, the opening degree adjustment of the outdoor expansion valve 12 is determined by the minimum water temperature value of the inlet water temperatures Tin of the hydraulic modules 200 obtained by real-time monitoring, wherein the larger the minimum water temperature value is, the smaller the opening degree of the outdoor expansion valve 12 is.
Further, referring to fig. 5, during the start mode a, five-stage first water temperature ranges are pre-divided based on the minimum water temperature value, wherein the first water temperature range of one stage is 0 to 35 ℃, and the opening degree value corresponding to the outdoor unit expansion valve 12 is 300P; the second-stage first water temperature range is 32-40 ℃, and the corresponding opening degree value of the outdoor unit expansion valve 12 is 250P; the three-stage first water temperature range is 40-45 ℃, and the opening degree value corresponding to the outdoor unit expansion valve 12 is 200P; the first water temperature range of the four stages is 45-50 ℃, and the opening degree value corresponding to the outdoor unit expansion valve 12 is 150P; the first water temperature range of the fifth grade is 50 to infinity, and the corresponding opening degree value of the outdoor unit expansion valve 12 is 100P.
Specifically, referring to fig. 6, during the on-mode B of the multi-split air conditioner, the opening degree adjustment of the outdoor expansion valve 12 is determined by the minimum water temperature value among the inlet water temperatures Tin of the sets of hydro modules 200 obtained through real-time monitoring, wherein the smaller the minimum water temperature value is, the larger the opening degree of the outdoor expansion valve 12 is.
Further, during the starting mode B, a fifth-stage second water temperature range is divided in advance based on the minimum water temperature value, wherein the first-stage second water temperature range is 0-35 ℃, and the opening degree value corresponding to the outdoor unit expansion valve 12 is 100P; the second-stage second water temperature range is 32-40 ℃, and the corresponding opening degree value of the outdoor unit expansion valve 12 is 150P; the third-stage second water temperature range is 40-45 ℃, and the opening degree value corresponding to the outdoor unit expansion valve 12 is 200P; the fourth-stage second water temperature range is 45-50 ℃, and the opening degree value corresponding to the outdoor unit expansion valve 12 is 250P; the fifth-stage second water temperature is 50 to infinity, and the corresponding opening degree value of the outdoor unit expansion valve 12 is 300P
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 (7)
1. A control method for simultaneously starting refrigeration and domestic hot water in a multi-split air conditioner comprises an outdoor unit (100), at least one group of hydraulic modules (200) and at least one group of indoor modules (300), wherein the outdoor unit (100) is respectively connected with the indoor modules (300) through a liquid pipe (7) and high and low pressure air pipes (8), and the outdoor unit (100) is respectively connected with the hydraulic modules (200) through the liquid pipe (7), the high and low pressure air pipes (8) and a high pressure air pipe (9); the outdoor unit (100) comprises a compressor (1), a first four-way valve (2), a second four-way valve (3) and an outdoor heat exchanger (4), an outdoor unit expansion valve (12) is arranged on the liquid pipe (7), and a first electromagnetic valve (13) and a second electromagnetic valve (14) are respectively arranged on the high-pressure air pipe (9) and the high-pressure air pipe (8); the method is characterized in that: the control method for simultaneously starting refrigeration and domestic hot water comprises a mode A and a mode B, wherein in the mode A, a first four-way valve (2) and a second four-way valve (3) are powered off, a first electromagnetic valve (13) is opened, and a second electromagnetic valve (14) is closed; in the mode B, the first four-way valve (2) is electrified, the second four-way valve (3) is powered off, the first electromagnetic valve (13) is opened, and the second electromagnetic valve (14) is closed;
the selective switching of the multi-split air conditioner in the mode A or the mode B comprises the following steps: when the multi-split air conditioner is started and has the water heating requirements of the hydraulic modules (200) and the refrigeration requirements of the indoor modules (300), the water inlet temperature Tin of each group of hydraulic modules (200) in the water heating state is acquired according to real-time monitoring, and the multi-split air conditioner is correspondingly controlled to be in the mode A or the mode B, wherein when the minimum water temperature value in the water inlet temperature Tin of each group of hydraulic modules (200) is higher than the preset temperature, the mode A is started; conversely, when the minimum water temperature value in each water inlet temperature Tin of each group of hydraulic modules (200) is equal to or lower than the preset temperature, the mode B is started; when only one group of hydraulic modules (200) is in a hot water making state, the water inlet temperature Tin of the hydraulic modules (200) is used as the minimum water temperature value to be compared and judged with the preset temperature; the multi-split air conditioner is in the operation period of simultaneous cooling and heating water, the outlet water temperature Tout of each group of hydraulic modules (200) in the heating water state is monitored and obtained in real time, when the outlet water temperature Tout of any one group of hydraulic modules (200) is monitored to be higher than a preset high-temperature protection value, the multi-split air conditioner is forcibly switched to the mode A to operate, and after all the outlet water temperatures Tout are equal to or lower than the preset high-temperature protection value, the inlet water temperature Tin of each group of hydraulic modules (200) in the heating water state is obtained based on real-time monitoring again to correspondingly control the multi-split air conditioner operation mode A or the mode B.
2. The control method of the multi-split simultaneous cooling and domestic hot water as claimed in claim 1, wherein: during the multi-split air conditioner in the starting mode A, the opening degree of the outdoor unit expansion valve (12) is adjusted according to the minimum water temperature value in the inlet water temperature Tin of each group of hydraulic modules (200) obtained through real-time monitoring, wherein the larger the minimum water temperature value is, the smaller the opening degree of the outdoor unit expansion valve (12) is.
3. The control method of the multi-split simultaneous cooling and domestic hot water as claimed in claim 2, wherein: during the starting mode A, a five-stage first water temperature range is divided in advance based on the minimum water temperature value, wherein the first-stage first water temperature range is 0-35 ℃, and the opening value corresponding to the outdoor unit expansion valve (12) is 300P; the range of the second-stage first water temperature is 32-40 ℃, and the corresponding opening degree value of the outdoor unit expansion valve (12) is 250P; the three-stage first water temperature range is 40-45 ℃, and the opening degree value corresponding to the outdoor unit expansion valve (12) is 200P; the first water temperature range of the four stages is 45-50 ℃, and the opening degree value corresponding to the outdoor unit expansion valve (12) is 150P; the first water temperature range of the fifth grade is 50 to infinity ℃, and the corresponding opening degree value of the outdoor unit expansion valve (12) is 100P.
4. The control method of the multi-split simultaneous cooling and domestic hot water as claimed in claim 2, wherein: during the on-state mode B of the multi-split air conditioner, the opening degree adjustment of the outdoor unit expansion valve (12) is determined by the minimum water temperature value in the inlet water temperature Tin of each group of hydraulic modules (200) obtained through real-time monitoring, wherein the smaller the minimum water temperature value is, the larger the opening degree of the outdoor unit expansion valve (12) is.
5. The multi-split control method for simultaneously starting refrigeration and domestic hot water as claimed in claim 4, wherein: during the starting mode B, a fifth-stage second water temperature range is divided in advance based on the minimum water temperature value, wherein the first-stage second water temperature range is 0-35 ℃, and the opening degree value corresponding to the outdoor unit expansion valve (12) is 100P; the second-stage second water temperature range is 32-40 ℃, and the opening degree value corresponding to the outdoor unit expansion valve (12) is 150P; the third-stage second water temperature range is 40-45 ℃, and the corresponding opening degree value of the outdoor unit expansion valve (12) is 200P; the fourth-stage second water temperature range is 45-50 ℃, and the opening degree value corresponding to the outdoor unit expansion valve (12) is 250P; the fifth-grade second water temperature range is 50 to infinity ℃, and the corresponding opening degree value of the outdoor unit expansion valve (12) is 300P.
6. The control method of the multi-split simultaneous cooling and domestic hot water as claimed in claim 1, wherein: the preset temperature is 45 ℃.
7. The control method of the multi-split simultaneous cooling and domestic hot water as claimed in claim 3, wherein: the preset high temperature protection value is 55 ℃.
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