CN112594821A - 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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- 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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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 refrigerant quantity detection control method of a multi-split air conditioner system based on exhaust side parameters, which is characterized in that the detection control method is based on exhaust temperature T1, exhaust pressure P1, exhaust superheat SH and a current value I at the input side of a compressor, and according to the judgment results of various parameters, if the judgment results of at least three parameters are higher than or lower than a preset normal parameter range, or the judgment results of two parameters are higher than or lower than the preset normal parameter range and the judgment results of the other two parameters are within the preset normal parameter range, the refrigerant quantity is judged to be large/small, and the steps S1-S3 are repeated under the judgment results of other parameters, so that the monitoring and the judgment are continuously carried out.
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.
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:
s1, when the multi-split air conditioner is started and has the water power module heating water and the indoor module refrigerating requirements, determining to start a mode A or a mode B to continuously operate according to the difference between the initial energy requirement NBh of the water power module and the initial energy requirement Nc of the indoor module;
and S2, after the multi-split air conditioner continuously operates for a preset time in the step S1, real-time monitoring is carried out to obtain the high pressure at the air outlet of the compressor, and the operation of the multi-split air conditioner is determined to be kept in the current mode or the starting mode A or the starting mode B based on the real-time high pressure.
Further, in step S1, when the difference between the initial energy requirement NBh of the hydro module and the initial energy requirement Nc of the indoor module is greater than-4, the mode a is enabled; conversely, mode B is enabled when the difference between the initial energy requirement of the hydro module NBh and the initial energy requirement of the indoor module Nc is less than-4.
Further, in step S2, when the high pressure is greater than 3.7MPa, mode B is enabled; when the high-pressure is less than 2.3MPa, starting the mode A; when the high-pressure is between 2.3 and 3.7MPa, the current mode is kept.
Further, during the starting mode A of the multi-split air conditioner, the opening degree adjustment of the outdoor unit expansion valve comprises the following steps:
w1, when the mode A is just started, according to the difference value between the initial energy requirement of the hydraulic module and the initial energy requirement of the indoor module, the expansion valve of the outdoor unit is adjusted to the corresponding opening degree to continuously operate;
and W2, after the preset time is continued, monitoring and obtaining the exhaust temperature and the high pressure of the primary compressor at equal time intervals, calculating and obtaining the primary exhaust superheat degree, and correspondingly adjusting the opening degree on the basis of the current opening degree of the outdoor unit expansion valve on the basis of a preset opening degree adjusting value corresponding to the exhaust superheat degree.
Further, in step W2, if the preset opening degree adjustment value corresponding to the discharge superheat degree is 0P, the average value T2B of the outlet temperatures of the indoor heat exchangers of all the indoor modules in the cooling state is monitored and acquired, and the adjustment is corrected based on the current opening degree of the outdoor unit expansion valve based on the average value T2B.
Further, a six-stage outlet temperature range is divided in advance based on the average value T2B, wherein the first-stage outlet temperature range is infinity to 3 ℃, and the corresponding opening correction value is 16P; the temperature range of the secondary outlet is 3-6 ℃, and the corresponding opening correction value is 8P; the temperature range of the third-stage outlet is 6-9 ℃, and the corresponding opening correction value is 0P; the temperature range of the four-stage outlet is 9-11 ℃, and the corresponding opening correction value is-8P; the temperature range of the fifth-stage outlet is 11-13 ℃, and the corresponding opening correction value is-16P; the six-grade outlet temperature range is 13 to infinity ℃, and the corresponding opening correction value is-24P.
Further, in step W1, a four-stage energy demand difference range is pre-divided based on the difference between the initial energy demand of the hydraulic module and the initial energy demand of the indoor module, wherein the one-stage energy demand difference range is ∞ -8, and the opening of the corresponding outdoor unit expansion valve is 100P; the difference value range of the secondary energy requirement is 8-20, and the opening degree of the corresponding outdoor unit expansion valve is 150P; the difference value range of the three levels of energy requirements is 20-32, and the opening degree of the corresponding outdoor unit expansion valve is 200P; the range of the three-level energy requirement difference is 32 to infinity, and the opening degree of the corresponding outdoor unit expansion valve is 250P.
Further, in step W2, a six-stage superheat range is pre-divided based on the exhaust superheat, wherein the one-stage superheat range is-infinity to 16, and the preset opening degree adjustment value is-16P; the secondary superheat degree range is 16-18, and the preset opening degree adjusting value is-8P; the range of the three-level superheat degree is 18-33, and the preset opening degree adjusting value is 0P; the range of four-stage superheat degree is 33-35, and the preset opening degree adjusting value is 8P; the five-stage superheat degree range is 35-38, and the preset opening degree adjusting value is 16P; the six-stage superheat degree range is 38 to infinity, and the preset opening degree adjusting value is 24P.
Further, during the on-mode B of the multi-split air conditioner, the opening degree of the outdoor unit expansion valve is determined by monitoring the obtained discharge temperature of the compressor, wherein the higher the monitored discharge temperature is, the larger the opening degree corresponding to the outdoor unit expansion valve is.
Further, the preset time is 15 min.
The invention adopts the scheme, and has the beneficial effects that: when the refrigeration and heating water are simultaneously opened, whether the outdoor heat exchanger is used as a condenser or an evaporator can be reasonably controlled according to the energy demand condition, and the opening condition of the outdoor unit expansion valve 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 range of the required difference in step S1.
Fig. 4 is a schematic diagram of the high pressure in step S2.
FIG. 5 is a diagram illustrating the required difference range in step W1.
Fig. 6 is a schematic diagram of the range of the degree of superheat in step W2.
FIG. 7 is a schematic of the outlet temperature range.
FIG. 8 is a graphical representation of the range of exhaust temperatures in 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 ports. 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.
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 powered on, the second four-way valve 3 is powered off, the first electromagnetic valve 13 is opened, and the second electromagnetic 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 to be condensed and then 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 to be condensed and released 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 to be evaporated, and then the refrigerant after evaporation and heat absorption flows back to the compressor 1 through the high-pressure. 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.
In this embodiment, the switching of the multiple online units between the mode a and the mode B includes the following steps:
s1, when the multi-split air conditioner is started and has the heating water requirements of the hydraulic module 200 and the cooling requirements of the indoor modules 300, determining to start the mode A or the mode B to continuously operate according to the difference between the initial energy requirement NBh of the hydraulic module 200 and the initial energy requirement Nc of the indoor modules 300.
Further, as shown in fig. 3, in step S1, when the difference between the initial energy requirement NBh of the hydro module 200 and the initial energy requirement Nc of the indoor module 300 is greater than-4, the mode a is enabled; conversely, mode B is enabled when the difference between the initial energy requirement NBh of the hydro module 200 and the initial energy requirement Nc of the indoor module 300 is less than-4.
And S2, after the multi-split air conditioner continuously operates for a preset time (preferably 15 min) in the step S1, real-time monitoring is carried out to obtain the high pressure at the air outlet of the compressor 1, and the current mode or the starting mode A or the starting mode B is determined to be kept to operate based on the real-time high pressure.
Further, as shown in fig. 4, in step S2, when the high pressure is greater than 3.7MPa, mode B is enabled; when the high-pressure is less than 2.3MPa, starting the mode A; when the high-pressure is between 2.3 and 3.7MPa, the current mode is kept.
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-conditioning system, the opening degree adjustment of the outdoor expansion valve 12 includes the following steps:
and W1, when the mode A is started, the outdoor expansion valve 12 is adjusted to a corresponding opening degree to continuously operate according to the difference between the initial energy requirement of the hydraulic module 200 and the initial energy requirement of the indoor module 300.
Further, as shown in fig. 5, in step W1, a four-stage energy demand difference range is pre-divided based on the difference between the initial energy demand of the hydro module 200 and the initial energy demand of the indoor module 300, wherein the one-stage energy demand difference range is ∞ -8, and the opening degree of the corresponding outdoor expansion valve 12 is 100P; the difference value range of the secondary energy requirement is 8-20, and the opening degree of the corresponding outdoor unit expansion valve 12 is 150P; the difference value range of the three-level energy requirement is 20-32, and the opening degree of the corresponding outdoor unit expansion valve 12 is 200P; the range of the difference of the three-level energy requirement is 32 to infinity, and the opening degree of the corresponding outdoor unit expansion valve 12 is 250P.
And W2, after the preset time is continued, monitoring the exhaust temperature and the high pressure of the primary compressor 1 at equal time intervals, calculating to obtain the primary exhaust superheat degree, and correspondingly adjusting the opening degree on the basis of the current opening degree of the outdoor unit expansion valve 12 on the basis of a preset opening degree adjusting value corresponding to the exhaust superheat degree.
Further, as shown in fig. 6, in step W2, a six-stage superheat range is pre-divided based on the exhaust superheat, wherein the one-stage superheat range is-infinity to 16, and the preset opening degree adjustment value is-16P; the secondary superheat degree range is 16-18, and the preset opening degree adjusting value is-8P; the range of the three-level superheat degree is 18-33, and the preset opening degree adjusting value is 0P; the range of four-stage superheat degree is 33-35, and the preset opening degree adjusting value is 8P; the five-stage superheat degree range is 35-38, and the preset opening degree adjusting value is 16P; the six-stage superheat degree range is 38 to infinity, and the preset opening degree adjusting value is 24P.
In order to adjust the opening degree of the outdoor expansion valve 12 more accurately, in step W2, if the preset opening degree adjustment value corresponding to the discharge superheat degree is 0P, the average value T2B of the outlet temperatures of the indoor heat exchangers of all the indoor modules 300 in the cooling state is monitored and obtained, and the adjustment is corrected based on the current opening degree of the outdoor expansion valve 12 corresponding to the average value T2B.
Further, as shown in fig. 7, a six-stage outlet temperature range is divided in advance based on the average value T2B, wherein the first-stage outlet temperature range is ∞ -3 ℃, and the corresponding opening correction value is 16P; the temperature range of the secondary outlet is 3-6 ℃, and the corresponding opening correction value is 8P; the temperature range of the third-stage outlet is 6-9 ℃, and the corresponding opening correction value is 0P; the temperature range of the four-stage outlet is 9-11 ℃, and the corresponding opening correction value is-8P; the temperature range of the fifth-stage outlet is 11-13 ℃, and the corresponding opening correction value is-16P; the six-grade outlet temperature range is 13 to infinity ℃, and the corresponding opening correction value is-24P.
In this embodiment, the discharge superheat = a saturation temperature corresponding to a discharge temperature of the compressor 1 and a high pressure, wherein the saturation temperature corresponding to the high pressure is determined by a refrigerant property, and a temperature value corresponding to the saturation pressure of the refrigerant property table needs to be queried, which can be queried through a refrigerant property table provided by a teaching material or a manufacturer.
In the present embodiment, during the on mode B of the multi-split air conditioner, the opening degree of the outdoor expansion valve 12 is determined by monitoring the discharge temperature of the compressor 1, wherein as shown in fig. 8, the higher the monitored discharge temperature is, the larger the opening degree of the outdoor expansion valve 12 is.
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 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 powered on, 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:
s1, when the multi-split air conditioner is started and has the heating water of a hydraulic module (200) and the refrigerating requirement of an indoor module (300), determining to start a mode A or a mode B to continuously operate according to the difference between the initial energy requirement NBh of the hydraulic module (200) and the initial energy requirement Nc of the indoor module (300);
and S2, after the multi-split air conditioner continuously operates for a preset time in the step S1, monitoring and acquiring the high pressure at the air outlet of the compressor (1) in real time, and determining to keep the current mode or the starting mode A or the starting mode B to operate based on the real-time high pressure.
2. The control method of the multi-split simultaneous cooling and domestic hot water as claimed in claim 1, wherein: in step S1, when the difference between the initial energy requirement NBh of the hydro module (200) and the initial energy requirement Nc of the indoor module (300) is greater than-4, the mode a is enabled; conversely, mode B is enabled when the difference between the initial energy requirement NBh of the hydro module (200) and the initial energy requirement Nc of the indoor module (300) is less than-4.
3. The control method of the multi-split simultaneous cooling and domestic hot water as claimed in claim 1, wherein: in step S2, when the high pressure is greater than 3.7MPa, mode B is enabled; when the high-pressure is less than 2.3MPa, starting the mode A; when the high-pressure is between 2.3 and 3.7MPa, the current mode is kept.
4. The control method of the multi-split simultaneous cooling and domestic hot water as claimed in claim 1, wherein: during the on-line mode A, the opening degree adjustment of the outdoor unit expansion valve (12) comprises the following steps:
w1, when the mode A is just started, the outdoor expansion valve (12) is adjusted to a corresponding opening degree to continuously operate according to the difference value between the initial energy requirement of the hydraulic module (200) and the initial energy requirement of the indoor module (300);
and W2, after the preset time is continued, monitoring the exhaust temperature and the high pressure of the primary compressor (1) at equal time intervals, calculating to obtain the primary exhaust superheat degree, and correspondingly adjusting the opening degree on the basis of the current opening degree of the outdoor unit expansion valve (12) on the basis of a preset opening degree adjusting value corresponding to the exhaust superheat degree.
5. The multi-split control method for simultaneously starting refrigeration and domestic hot water as claimed in claim 4, wherein: in step W2, if the preset opening degree adjustment value corresponding to the discharge superheat degree is 0P, the average value T2B of the outlet temperatures of the indoor heat exchangers of all the indoor modules (300) in the cooling state is monitored and acquired, and the adjustment is corrected on the basis of the current opening degree of the outdoor unit expansion valve (12) based on the average value T2B.
6. The control method of multi-split simultaneous cooling and domestic hot water as claimed in claim 5, wherein: dividing a six-stage outlet temperature range in advance based on the average value T2B, wherein the first-stage outlet temperature range is-infinity-3 ℃, and the corresponding opening correction value is 16P; the temperature range of the secondary outlet is 3-6 ℃, and the corresponding opening correction value is 8P; the temperature range of the third-stage outlet is 6-9 ℃, and the corresponding opening correction value is 0P; the temperature range of the four-stage outlet is 9-11 ℃, and the corresponding opening correction value is-8P; the temperature range of the fifth-stage outlet is 11-13 ℃, and the corresponding opening correction value is-16P; the six-grade outlet temperature range is 13 to infinity ℃, and the corresponding opening correction value is-24P.
7. The multi-split control method for simultaneously starting refrigeration and domestic hot water as claimed in claim 4, wherein: in step W1, a four-stage energy demand difference range is pre-divided based on the difference between the initial energy demand of the hydro module (200) and the initial energy demand of the indoor module (300), wherein the one-stage energy demand difference range is ∞ -8, and the opening of the corresponding outdoor expansion valve (12) is 100P; the difference range of the secondary energy requirement is 8-20, and the opening degree of the corresponding outdoor unit expansion valve (12) is 150P; the difference range of the three-level energy requirement is 20-32, and the opening degree of the corresponding outdoor unit expansion valve (12) is 200P; the three-stage energy requirement difference range is 32 to infinity, and the opening degree of the corresponding outdoor unit expansion valve (12) is 250P.
8. The multi-split control method for simultaneously starting refrigeration and domestic hot water as claimed in claim 4, wherein: in step W2, a six-stage superheat degree range is divided in advance based on the exhaust superheat degree, wherein the one-stage superheat degree range is-infinity-16, and the preset opening degree adjusting value is-16P; the secondary superheat degree range is 16-18, and the preset opening degree adjusting value is-8P; the range of the three-level superheat degree is 18-33, and the preset opening degree adjusting value is 0P; the range of four-stage superheat degree is 33-35, and the preset opening degree adjusting value is 8P; the five-stage superheat degree range is 35-38, and the preset opening degree adjusting value is 16P; the six-stage superheat degree range is 38 to infinity, and the preset opening degree adjusting value is 24P.
9. The control method of the multi-split simultaneous cooling and domestic hot water as claimed in claim 1, wherein: during the on-mode B of the multi-split air conditioner, the opening degree of the outdoor unit expansion valve (12) is determined by monitoring the obtained discharge temperature of the compressor (1), wherein the higher the monitored discharge temperature is, the larger the opening degree of the outdoor unit expansion valve (12) is.
10. The control method of the multi-split simultaneous cooling and domestic hot water as claimed in claim 1, wherein: the preset time is 15 min.
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