Air conditioning system, control method and device thereof and nonvolatile storage medium

Abstract

The invention provides an air conditioning system, a control method and device of the air conditioning system and a nonvolatile storage medium. The control method of the air conditioning system comprises the steps that whether the operation time period of the air conditioning system is in a first electricity price time period or a second electricity price time period or not is judged; wherein the electricity price of the first electricity price time period is lower than that of the second electricity price time period; when the operation time period of the air conditioning system is in the first electricity price time period, the air conditioning system is controlled to enter or exit the cold storage mode according to the water temperature of an energy accumulator of the air conditioning system, the cold storage accumulated duration of the air conditioning system in the cold storage mode and the cold release accumulated duration of the air conditioning system in the cold release mode; when the operation time period of the air conditioning system is in the second electricity price time period, first judgment is executed, specifically, whether the water temperature of the energy accumulator is smaller than or equal to the first preset temperature Tmax or not is judged, and if yes, the air conditioning system is controlled to enter a cold release mode; otherwise, controlling the air-conditioning system to quit the cold release mode. The control method solves the problem that cold storage and cold release of an air conditioning system in the prior art cannot be operated efficiently.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning equipment, and in particular to an air conditioning system and a control method, device, and non-volatile storage medium thereof. Background Art

[0002] At present, cold storage technology is widely used in air-conditioning equipment. Cold storage refers to the process in which a multi-split unit with energy storage function stores cold energy in an accumulator; cold release refers to the process in which a multi-split unit with energy storage function releases the cold energy stored in the accumulator during the refrigeration process to assist refrigeration and improve its energy efficiency.

[0003] However, the entry and exit methods of the air conditioning system's cold storage and cold release are basically based on the temperature of the accumulator and the operating environment. The effect is relatively simple and cannot flexibly respond to changes in operating conditions, resulting in the air conditioning system's cold storage and cold release being unable to operate efficiently. In addition, when the cold storage capacity is insufficient, the cold storage or cooling function is turned on in an intermittent manner, resulting in room temperature deviations, which seriously damage the user experience. Summary of the invention

[0004] The main purpose of the present invention is to provide an air-conditioning system and a control method, device, and non-volatile storage medium thereof to solve the problem that the cold storage and cold release of the air-conditioning system in the prior art cannot operate efficiently.

[0005] In order to achieve the above object, according to a first aspect of the present invention, a control method of an air conditioning system is provided, comprising:

[0006] Determine whether the operation time period of the air conditioning system is in a first electricity price period or a second electricity price period; wherein the electricity price in the first electricity price period is lower than the electricity price in the second electricity price period;

[0007] When the operation period of the air-conditioning system is in the first electricity price period, the air-conditioning system is controlled to enter or exit the cold storage mode according to the water temperature of the accumulator of the air-conditioning system, the accumulated cold storage time of the air-conditioning system in the cold storage mode, and the accumulated cold release time of the air-conditioning system in the cold release mode;

[0008] When the operation period of the air conditioning system is in the second electricity price period, the first determination is performed: determining whether the water temperature of the accumulator is less than or equal to the first preset temperature T max If so, the air conditioning system is controlled to enter the cooling mode; otherwise, the air conditioning system is controlled to exit the cooling mode.

[0009] Furthermore, when the operation period of the air-conditioning system is in the first electricity price period, the method for controlling the air-conditioning system to enter or exit the cold storage mode according to the water temperature of the accumulator of the air-conditioning system, the accumulated cold storage time of the air-conditioning system in the cold storage mode, and the accumulated cold release time of the air-conditioning system in the cold release mode includes:

[0010] Determine whether the water temperature of the accumulator is greater than or equal to the second preset temperature T0,

[0011] If yes, execute the second determination: determine whether the accumulated cold storage time is less than or equal to the first preset time t max , if yes, control the air conditioning system to enter the cold storage mode; otherwise, control the air conditioning system to exit the cold storage mode;

[0012] Otherwise, determine whether the cumulative cooling time is greater than or equal to the second preset time t min If so, the air conditioning system is controlled to execute the second determination; otherwise, the air conditioning system is controlled to exit the cold storage mode.

[0013] Further, when the accumulated cold storage time is less than or equal to the first preset time t max Afterwards, before controlling the air conditioning system to enter the cold storage mode, the control method of the air conditioning system further includes:

[0014] It is determined whether the accumulated freezing time of the accumulator is less than or equal to the third preset time t1. If so, the air conditioning system is controlled to enter the cold storage mode; otherwise, the air conditioning system is controlled to exit the cold storage mode.

[0015] Furthermore, after obtaining that the accumulated freezing time is less than or equal to the third preset time t1, before controlling the air-conditioning system to enter the cold storage mode, the control method of the air-conditioning system further includes:

[0016] Determine whether the water level in the accumulator is less than or equal to a preset height H1. If so, control the air conditioning system to enter the cold storage mode; otherwise, control the air conditioning system to exit the cold storage mode.

[0017] Furthermore, the control method of the air conditioning system also includes:

[0018] When the operation period of the air-conditioning system is in the second electricity price period, the third determination is performed: determining whether the startup rate of the plurality of air-conditioning indoor units of the air-conditioning system is greater than or equal to the preset startup rate X%,

[0019] If the determination results of the first determination and the third determination are both yes, the air conditioning system is controlled to enter the cooling release mode; otherwise, the air conditioning system is controlled to exit the cooling release mode.

[0020] Furthermore, the control method of the air conditioning system also includes:

[0021] When the operation period of the air conditioning system is in the second electricity price period, the fourth determination is performed: determining whether the frequency of the compressor of the air conditioning system is greater than or equal to the preset frequency f1,

[0022] If the determination results of the first determination and the fourth determination are both yes, the air conditioning system is controlled to enter the cooling release mode; otherwise, the air conditioning system is controlled to exit the cooling release mode.

[0023] Furthermore, the control method of the air conditioning system also includes:

[0024] When the operation period of the air conditioning system is in the second electricity price period, the fifth determination is performed: determining whether the maximum pressure of the air conditioning system is greater than or equal to a preset value T1,

[0025] If the determination results of the first determination and the fifth determination are both yes, the air-conditioning system is controlled to enter the cooling release mode; otherwise, the air-conditioning system is controlled to exit the cooling release mode.

[0026] Furthermore, the control side of the air conditioning system also includes:

[0027] When the air-conditioning system is in the cooling mode, monitor whether the inlet pipe temperature of the accumulator is less than or equal to the difference between the outlet liquid temperature of the subcooler of the air-conditioning system and the subcooling degree T2 increased in the cooling mode. If so, control the air-conditioning system to continue the cooling mode; otherwise, control the air-conditioning system to exit the cooling mode.

[0028] Furthermore, the control method of the air conditioning system also includes:

[0029] Determine whether the air conditioning system is in the whole machine cooling mode, and when the air conditioning system is in the whole machine cooling mode, execute the command to control the air conditioning system to enter the cold storage mode or the cold release mode; otherwise, control the air conditioning system to exit the cold storage mode or the cold release mode; and / or

[0030] Receive instructions from the user and control the air conditioning system to enter or exit the cold storage mode or cold release mode according to the instructions; and / or

[0031] Detect whether any one or more of the multiple air-conditioning indoor units of the air-conditioning system are performing cooling, and if so, control the air-conditioning system to exit the cold storage mode.

[0032] According to a second aspect of the present invention, there is provided a control device for an air conditioning system, which is used to execute the control method for the air conditioning system, and the control device for the air conditioning system comprises:

[0033] A first judgment unit, used to judge whether the operation period of the air conditioning system is in the first electricity price period or the second electricity price period;

[0034] a first control unit, for controlling the air conditioning system to enter or exit the cold storage mode according to the water temperature of the accumulator of the air conditioning system, the accumulated cold storage time of the air conditioning system in the cold storage mode, and the accumulated cold release time of the air conditioning system in the cold release mode when the operation period of the air conditioning system is in the first electricity price period;

[0035] The second judgment unit is used to perform a first judgment when the operation period of the air conditioning system is in the second electricity price period: judging whether the water temperature of the accumulator is less than or equal to the first preset temperature T max ;

[0036] The second control unit is used to control the air conditioning system to enter the cooling mode when the determination result of the first determination is yes; otherwise, control the air conditioning system to exit the cooling mode.

[0037] According to a third aspect of the present invention, there is provided an air conditioning system, comprising the control device of the air conditioning system described above.

[0038] According to a fourth aspect of the present invention, a non-volatile storage medium is provided, the non-volatile storage medium including a stored program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute the above-mentioned air conditioning system control method.

[0039] By applying the technical solution of the present invention, the control method of the air-conditioning system utilizes low electricity prices to store cold, and releases it during high / flat electricity price periods to save energy, that is, stores cold in the first electricity price period, and releases cold in the second electricity price period; and, the control method controls the air-conditioning system to enter or exit the cold storage mode according to the water temperature of the accumulator of the air-conditioning system, the cumulative cold storage time of the air-conditioning system in the cold storage mode, and the cumulative cold release time of the air-conditioning system in the cold release mode, and controls the air-conditioning system to enter or exit the cold release mode according to the water temperature of the accumulator. It can be seen that the control method determines whether the air-conditioning system stores cold or releases cold through the cumulative cold storage time, the cumulative cold release time, the first electricity price period and the second electricity price period in conjunction with the water temperature of the accumulator, so that the system has sufficient and necessary conditions for storing and releasing cold in different situations according to the actual operating conditions, and can operate stably and efficiently, which solves the problem that the air-conditioning system in the prior art cannot store and release cold efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0041] Figure 1 A first flow chart showing a cold storage mode of the control method of the air conditioning system according to the present invention;

[0042] Figure 2 A flow chart showing a cooling mode of a control method for an air conditioning system according to the present invention;

[0043] Figure 3 A second flow chart showing a cold storage mode of the control method of the air conditioning system according to the present invention;

[0044] Figure 4 A schematic diagram showing a control device of an air conditioning system according to the present invention is shown.

[0045] The above drawings include the following reference numerals:

[0046] 10. A first judging unit;

[0047] 20. A first control unit;

[0048] 30. A second judging unit;

[0049] 40. Second control unit. DETAILED DESCRIPTION

[0050] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0051] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0053] The present invention provides a control method for an air conditioning system. Figures 1 to 3 ,include:

[0054] Steps S104 and S203, determining whether the operation period of the air conditioning system is in the first electricity price period or the second electricity price period; wherein the electricity price in the first electricity price period is lower than the electricity price in the second electricity price period;

[0055] Step S100, when the operation period of the air-conditioning system is in the first electricity price period, the air-conditioning system is controlled to enter or exit the cold storage mode according to the water temperature of the accumulator of the air-conditioning system, the accumulated cold storage time of the air-conditioning system in the cold storage mode, and the accumulated cold release time of the air-conditioning system in the cold release mode;

[0056] Step S204: when the operation period of the air conditioning system is in the second electricity price period, a first determination is performed: determining whether the water temperature of the accumulator is less than or equal to a first preset temperature T max If so, the air conditioning system is controlled to enter the cooling mode; otherwise, the air conditioning system is controlled to exit the cooling mode.

[0057] The control method of the air-conditioning system of the present invention utilizes low electricity prices to store cold, and releases it during high / flat electricity price periods to save energy, that is, stores cold in the first electricity price period, and releases cold in the second electricity price period; and, the control method controls the air-conditioning system to enter or exit the cold storage mode according to the water temperature of the accumulator of the air-conditioning system, the cumulative cold storage time of the air-conditioning system in the cold storage mode, and the cumulative cold release time of the air-conditioning system in the cold release mode, and controls the air-conditioning system to enter or exit the cold release mode according to the water temperature of the accumulator. It can be seen that the control method determines whether the air-conditioning system stores cold or releases cold through the cumulative cold storage time, the cumulative cold release time, the first electricity price period and the second electricity price period in conjunction with the water temperature of the accumulator, so that the system has sufficient and necessary conditions for storing cold and releasing cold in different situations according to the actual operating conditions, and can operate stably and efficiently, which solves the problem that the air-conditioning system in the prior art cannot store cold and release cold.

[0058] It should be noted that when the air conditioning system enters the cold storage mode, the accumulated cold storage time begins to be accumulated, and the accumulated cold storage time is reset to zero at the end of the first electricity price period; the total time the air conditioning system operates in the cold release mode until the start of this first electricity price period is counted as the accumulated cold release time. If cold storage is performed in this first electricity price period, the accumulated cold release time will be reset to zero at the end of this first electricity price period; if cold storage is not performed in this first electricity price period, the accumulated cold release time will not be reset to zero, and will continue to be accumulated when entering the cold release mode again. This operation is to connect with the last time, so there is no need to reset. Among them, the air conditioning system is multi-split.

[0059] In specific implementation, T max The water temperature when the accumulator cools down completely can be obtained through experimental testing and preset in the unit program in advance. max When T max is 35℃.

[0060] Specifically, the method of detecting whether it is in the first electricity price period includes: the user enters the time-of-use electricity price information used in advance, for example, in the XX:XX~YY:YY period, the electricity price is low electricity price; in the YY:YY~ZZ:ZZ period, the electricity price is high electricity price; in the ZZ:ZZ~XX:XX period, the electricity price is flat electricity price; or, read the local time-of-use electricity price information according to the positioning information, if it is not in the low electricity price period, that is, not in the first electricity price period, then exit / do not store cold. Similarly, if it is not in the high / flat electricity price period, then exit / do not release cold.

[0061] In this embodiment, when the operation period of the air-conditioning system is in the first electricity price period, the method for controlling the air-conditioning system to enter or exit the cold storage mode according to the water temperature of the accumulator of the air-conditioning system, the accumulated cold storage time of the air-conditioning system in the cold storage mode, and the accumulated cold release time of the air-conditioning system in the cold release mode includes:

[0062] Step S105, determining whether the water temperature of the accumulator is greater than or equal to a second preset temperature T0,

[0063] If yes, execute the second determination: Step S106, determine whether the accumulated cold storage time is less than or equal to the first preset time t max , if yes, control the air conditioning system to enter the cold storage mode; otherwise, control the air conditioning system to exit the cold storage mode;

[0064] Otherwise, determine whether the cumulative cooling time is greater than or equal to the second preset time t min If so, the air conditioning system is controlled to execute the second determination; otherwise, the air conditioning system is controlled to exit the cold storage mode.

[0065] In specific implementation, for an accumulator using water as the energy storage material, the water temperature of the accumulator is detected at the beginning of the first electricity price period. If the water temperature is greater than or equal to T0, the judgment of S106 is directly entered; if the water temperature is less than T0, the following judgment is made: the total time of the air-conditioning system running in the cooling mode before the beginning of the first electricity price period is calculated as the cumulative cooling time. If cooling is stored in the first electricity price period, the cumulative cooling time is cleared at the end of the first electricity price period; if cooling is not stored in the first electricity price period, the cumulative cooling time is not cleared, and it continues to be accumulated when entering the cooling mode again. If the S105 condition is met, the judgment of S106 is entered; if the S105 judgment is not met, cooling is not stored. Among them, the purpose of setting S105 is that when the user does not use cooling, the water temperature of the accumulator rises in the process of ineffective dissipation of cold into the environment. This condition can be used to identify this situation, and then cooling is not stored.

[0066] Specifically, the cumulative cooling time is initially set to t0 when leaving the factory, t0>t min , so that the initial cold storage can proceed smoothly.

[0067] Here, an example is given to illustrate the determination method of step S105: Assume that t min =40 min , T0=15℃.

[0068]

[0069] In specific implementation, t maxThe time for the accumulator to store full cold capacity is artificially set. It can be obtained through experimental tests and preset in the unit program in advance. If the accumulated cold storage time reaches t max The accumulator is considered to be fully cold; alternatively, t max When the air conditioning system enters the cold storage mode, the accumulated cold storage time begins to accumulate and is cleared at the end of the first electricity price period (even if the unit is shut down or exits the cold storage mode during this period, the time will not be cleared). When the accumulated cold storage time reaches t max When , it will exit / not perform cold storage.

[0070] In this embodiment, when the accumulated cold storage time is less than or equal to the first preset time t max Afterwards, before controlling the air conditioning system to enter the cold storage mode, the control method of the air conditioning system further includes:

[0071] Step S107, determining whether the accumulated freezing time of the accumulator is less than or equal to the third preset time t1, if so, controlling the air conditioning system to enter the cold storage mode; otherwise, controlling the air conditioning system to exit the cold storage mode.

[0072] In specific implementation, for an accumulator using water as the energy storage material, its cold storage process includes the cooling process from hot water to 0°C and the subsequent water freezing process. t1 is an artificial setting. The duration of the water freezing process in the accumulator during a complete cold storage process (from the water temperature dropping to 0°C until the end of the cold storage process) can be obtained through experimental testing and preset in the unit program in advance. Optionally, t1 < t max , t1 is 5h.

[0073] The reason for setting steps S106 and S107 at the same time is that: at the beginning of cold storage, if the accumulator is in a state where the cold capacity has not been completely released, that is, the accumulator already has some residual cold capacity (the water in the accumulator is in a cold water state), then there is no need to perform the time t max The cold storage process is sufficient to store the full cold capacity, so step S107 is set to end the cold storage when the freezing time t1 condition is met, and the end condition is more precise.

[0074] In this embodiment, after obtaining that the accumulated freezing time is less than or equal to the third preset time t1, before controlling the air-conditioning system to enter the cold storage mode, the control method of the air-conditioning system further includes:

[0075] Step S108, determining whether the water level in the accumulator is less than or equal to a preset height H1, if so, controlling the air conditioning system to enter a cold storage mode; otherwise, controlling the air conditioning system to exit the cold storage mode.

[0076] In specific implementation, the accumulator has a water level detection device. During the freezing process of the accumulator, the water level gradually rises due to the different densities of ice and water. When the water level rises to the height H1, the accumulator is fully stored with cold. Therefore, step S108 is set, and when the water level exceeds H1, the accumulator exits or does not store cold.

[0077] The reason for setting steps S107 and S108 at the same time is: if there is still some unmelted ice in the accumulator when cold storage starts, the cold capacity can be fully stored without reaching the freezing time t1. Therefore, step S108 is set to end cold storage when the water level height H1 condition is met, and the end condition is more precise.

[0078] In this embodiment, the control method of the air conditioning system further includes:

[0079] Step S205: When the operation period of the air-conditioning system is in the second electricity price period, a third determination is performed: determining whether the power-on rate of the plurality of air-conditioning indoor units of the air-conditioning system is greater than or equal to a preset power-on rate X%.

[0080] If the determination results of the first determination and the third determination are both yes, the air conditioning system is controlled to enter the cooling release mode; otherwise, the air conditioning system is controlled to exit the cooling release mode.

[0081] In specific implementation, the startup rate can be calculated according to the number of indoor units, that is, startup rate = number of powered-on indoor units / total number of indoor units, or it can be calculated according to the capacity of the indoor units, that is, startup rate = capacity of powered-on indoor units / total capacity of indoor units. In order to prevent the problem of poor circulation of refrigerant due to the use of cold release when too few indoor units are powered on, step S205 is set, that is, the startup rate of the indoor units must be greater than or equal to X% to use the cold release mode. When the startup rate is less than X%, exit or do not release cold. Specifically, 0<X≤100, X can be obtained through experimental testing and preset in the unit program in advance; optionally, X is 30.

[0082] It should be noted that when too few indoor units are turned on, the use of cold release will lead to poor refrigerant circulation because a larger flow of refrigerant is required to absorb cold from the cold storage unit and then transport it to each indoor unit; if only a few indoor units are running, the demand for refrigerant decreases, resulting in insufficient refrigerant circulation, which in turn leads to poor circulation.

[0083] In this embodiment, the control method of the air conditioning system further includes:

[0084] Step S206: When the operation period of the air conditioning system is in the second electricity price period, a fourth determination is performed: determining whether the frequency of the compressor of the air conditioning system is greater than or equal to a preset frequency f1.

[0085] If the determination results of the first determination and the fourth determination are both yes, the air conditioning system is controlled to enter the cooling release mode; otherwise, the air conditioning system is controlled to exit the cooling release mode.

[0086] In specific implementation, in order to prevent the problem of poor refrigerant circulation caused by using cooling when the compressor frequency is too low, condition S206 is set, that is, the compressor frequency must be greater than or equal to f1 before the cooling mode can be used. When the compressor frequency is less than f1, exit or do not release cooling. f1 can be obtained through experimental testing and preset in the unit program in advance. Optionally, f1 is 35Hz.

[0087] In this embodiment, the control method of the air conditioning system further includes:

[0088] Step S207: When the operation period of the air conditioning system is in the second electricity price period, the fifth determination is performed: determining whether the maximum pressure of the air conditioning system is greater than or equal to a preset value T1.

[0089] If the determination results of the first determination and the fifth determination are both yes, the air-conditioning system is controlled to enter the cooling release mode; otherwise, the air-conditioning system is controlled to exit the cooling release mode.

[0090] In specific implementation, in order to prevent the problem of poor refrigerant circulation caused by using cold release when the system high pressure is too low, step S207 is set, that is, the system high pressure must be greater than or equal to T1 before the cold release mode can be used. When the system high pressure is less than T1, exit or do not release cold. T1 can be obtained through experimental testing and preset in the unit program in advance; optionally, T1 is 40°C. Among them, the preset value T1 is the temperature value corresponding to the pressure of the air-conditioning system.

[0091] In specific implementation, when the above conditions S201 to S207 are met, the unit releases cold.

[0092] In this embodiment, the control side of the air conditioning system also includes:

[0093] Step S208, when the air-conditioning system is in the cooling mode, monitor whether the inlet pipe temperature of the accumulator is less than or equal to the difference between the outlet liquid temperature of the subcooler of the air-conditioning system and the supercooling degree T2 increased by the cooling mode. If so, control the air-conditioning system to continue the cooling mode; otherwise, control the air-conditioning system to exit the cooling mode.

[0094] In specific implementation, during the cooling process, the condition of step S208 needs to be checked. When the accumulator is releasing cooling, it will increase the subcooling degree of the unit, that is, the accumulator inlet pipe temperature is lower than the subcooler outlet temperature, and the difference between the two is the additional subcooling degree brought by the accumulator. Set step S208, that is, the additional subcooling degree exceeds T2, before the cooling can continue to be used. When the additional subcooling degree is less than T2, it means that the cooling effect of the accumulator is very poor and there is no gain effect on the energy efficiency of the unit, then the cooling is exited. Specifically, T2 is obtained through experimental testing and preset in the unit program in advance; optionally, T2 is 2°C.

[0095] In this embodiment, the control method of the air conditioning system further includes:

[0096] Step S101 or step S201, determine whether the air-conditioning system is in the whole machine cooling mode. When the air-conditioning system is in the whole machine cooling mode, execute the instruction to control the air-conditioning system to enter the cold storage mode or the cold release mode; otherwise, control the air-conditioning system to exit the cold storage mode or the cold release mode.

[0097] In specific implementation, the air conditioning system has two whole machine modes: cooling and heating. The whole machine should be set to cooling to have the need to store or release cold, so it must be in cooling mode.

[0098] In this embodiment, step S102 or step S202 receives a user's instruction and controls the air conditioning system to enter or exit the cold storage mode or the cold release mode according to the instruction.

[0099] During specific implementation, the user can choose whether to enable the energy storage function of the air-conditioning system through the wire controller or other means, and the default setting is enabled. When the user manually sets it to disabled, the air-conditioning system exits / does not perform the cold storage mode. When the user sets it to enabled, or it is enabled by default, other judgments are made. In addition, the user can choose whether to enable the cooling release function of the air-conditioning system through the wire controller or other means, and the default setting is enabled. When the user manually sets it to disabled, the air-conditioning system exits / does not perform the cooling release mode. When the user sets it to enabled, or it is enabled by default, other judgments are made. Steps S102 and S202 can be provided to the user in combination or separately.

[0100] In this embodiment, step S103 detects whether any one or more of the multiple air-conditioning indoor units of the air-conditioning system are performing cooling. If so, the air-conditioning system is controlled to exit the cold storage mode.

[0101] In specific implementation, when multiple air conditioner indoor units are all turned off, it means that the user has no cooling demand. Since cold storage and cooling conflict in the system flow path, cold storage can only be operated without cooling. When the user turns on any one or more air conditioner indoor units for cooling, exit / do not perform cold storage.

[0102] It should be noted that for air conditioning systems with energy storage function, when Figure 1 and Figure 3 When the judgment conditions are met, enter or exit the cold storage mode. The operation order of S101, S102, S103, S104, and S100 can be changed arbitrarily; enter the cold storage mode when all the judgment conditions are met, and exit the cold storage mode if any judgment condition is not met, if it is currently storing cold; if it is currently in other modes or shut down, it will not enter the cold storage mode.

[0103] It should be noted that for air conditioning systems with energy storage function, when Figure 2 When the judgment conditions are met, the unit will enter or exit the cooling release mode. The operation order of S201-S207 can be changed arbitrarily. When all conditions are met, the unit will enter the cooling release mode. When any judgment condition is not met, if the unit is currently cooling, the cooling release mode will be exited; if the unit is currently in other modes or shut down, the cooling release mode will not be entered (if the unit exits or does not enter the cooling release mode, the unit can still perform cooling in the normal cooling mode if necessary).

[0104] The technical problem solved by the present invention is: how to enter or exit the cold storage and release mode according to the actual operating conditions (unit status, accumulator status, environmental information, etc.), so that the system has sufficient and necessary conditions for cold storage and release under any circumstances, and can operate stably and efficiently.

[0105] The present invention provides the entry and exit conditions of the cold storage mode, including the whole machine state, user selection, unit operation state, electricity price information, etc., and provides the entry and exit conditions of the cold release mode, including the whole machine state, user selection, unit operation state, electricity price information, etc. Beneficial effects include: providing the entry and exit conditions of the cold storage mode, so that it can meet the cold release demand of the unit without wasting too much cold storage; providing the entry and exit conditions of the cold release mode, so that it can make full use of the cold storage capacity, and at the same time will not release the cold after the cold storage capacity is exhausted and damage the energy efficiency of the unit.

[0106] The present invention also provides a control device for an air conditioning system, such as Figure 4 As shown, for executing the control method of the air conditioning system in the above embodiment, the control device of the air conditioning system includes:

[0107] The first judgment unit 10 is used to judge whether the operation period of the air conditioning system is in the first electricity price period or the second electricity price period;

[0108] The first control unit 20 is used to control the air conditioning system to enter or exit the cold storage mode according to the water temperature of the accumulator of the air conditioning system, the accumulated cold storage time of the air conditioning system in the cold storage mode, and the accumulated cold release time of the air conditioning system in the cold release mode when the operation period of the air conditioning system is in the first electricity price period;

[0109] The second judgment unit 30 is used to perform a first judgment when the operation period of the air conditioning system is in the second electricity price period: judging whether the water temperature of the accumulator is less than or equal to the first preset temperature T max ;

[0110] The second control unit 40 is used to control the air-conditioning system to enter the cooling mode when the determination result of the first determination is yes; otherwise, control the air-conditioning system to exit the cooling mode.

[0111] In specific implementation, the control device of the air-conditioning system sets a first judgment unit 10, a first control unit 20, a second judgment unit 30 and a second control unit 40, so that the accumulated cold storage time, the accumulated cold release time, the first electricity price period and the second electricity price period cooperate with the water temperature of the accumulator to jointly determine whether the air-conditioning system stores cold or releases cold, so that the system has sufficient and necessary conditions to store cold and release cold under different circumstances according to the actual operating conditions, and can operate stably and efficiently, which solves the problem that the air-conditioning system in the prior art cannot store cold and release cold efficiently.

[0112] The present invention also provides an air conditioning system, comprising the control device of the air conditioning system of the above embodiment.

[0113] In a specific implementation, since the air-conditioning system includes a control device, and the control device includes a first judgment unit 10, a first control unit 20, a second judgment unit 30 and a second control unit 40, the problem that the air-conditioning system cannot efficiently store and release cold is solved.

[0114] The present invention also provides a non-volatile storage medium, which includes a stored program, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute the control method of the air-conditioning system in the above embodiment.

[0115] Specifically, the above storage medium is used to store program instructions for executing the following functions to achieve the following functions:

[0116] Determine whether the operation time period of the air conditioning system is in a first electricity price period or a second electricity price period; wherein the electricity price in the first electricity price period is lower than the electricity price in the second electricity price period;

[0117] When the operation period of the air-conditioning system is in the first electricity price period, the air-conditioning system is controlled to enter or exit the cold storage mode according to the water temperature of the accumulator of the air-conditioning system, the accumulated cold storage time of the air-conditioning system in the cold storage mode, and the accumulated cold release time of the air-conditioning system in the cold release mode;

[0118] When the operation period of the air conditioning system is in the second electricity price period, the first determination is performed: determining whether the water temperature of the accumulator is less than or equal to the first preset temperature T max If so, the air conditioning system is controlled to enter the cooling mode; otherwise, the air conditioning system is controlled to exit the cooling mode.

[0119] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0120] The control method of the air-conditioning system of the present invention utilizes low electricity prices to store cold, and releases it during high / flat electricity price periods to save energy, that is, stores cold in the first electricity price period, and releases cold in the second electricity price period; and, the control method controls the air-conditioning system to enter or exit the cold storage mode according to the water temperature of the accumulator of the air-conditioning system, the cumulative cold storage time of the air-conditioning system in the cold storage mode, and the cumulative cold release time of the air-conditioning system in the cold release mode, and controls the air-conditioning system to enter or exit the cold release mode according to the water temperature of the accumulator. It can be seen that the control method determines whether the air-conditioning system stores cold or releases cold through the cumulative cold storage time, the cumulative cold release time, the first electricity price period and the second electricity price period in conjunction with the water temperature of the accumulator, so that the system has sufficient and necessary conditions for storing cold and releasing cold in different situations according to the actual operating conditions, and can operate stably and efficiently, which solves the problem that the air-conditioning system in the prior art cannot store cold and release cold.

[0121] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0122] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0123] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control method for an air conditioning system, characterized in that: include: Determine whether the operation period of the air conditioning system is in a first electricity price period or a second electricity price period; wherein the electricity price of the first electricity price period is lower than the electricity price of the second electricity price period; When the operation period of the air-conditioning system is in the first electricity price period, the air-conditioning system is controlled to enter or exit the cold storage mode according to the water temperature of the accumulator of the air-conditioning system, the accumulated cold storage time of the air-conditioning system in the cold storage mode, and the accumulated cold release time of the air-conditioning system in the cold release mode; When the operation period of the air conditioning system is in the second electricity price period, a first determination is performed: determining whether the water temperature of the accumulator is less than or equal to a first preset temperature T max If so, control the air-conditioning system to enter the cooling mode; otherwise, control the air-conditioning system to exit the cooling mode.

2. The control method of the air conditioning system according to claim 1, characterized in that: When the operation period of the air-conditioning system is in the first electricity price period, the method for controlling the air-conditioning system to enter or exit the cold storage mode according to the water temperature of the accumulator of the air-conditioning system, the accumulated cold storage time of the air-conditioning system in the cold storage mode, and the accumulated cold release time of the air-conditioning system in the cold release mode, comprises: Determine whether the water temperature of the accumulator is greater than or equal to a second preset temperature T0, If yes, perform the second determination: determine whether the accumulated cold storage time is less than or equal to the first preset time t max , if yes, control the air conditioning system to enter the cold storage mode; otherwise, control the air conditioning system to exit the cold storage mode; Otherwise, determine whether the cumulative duration of cooling release is greater than or equal to the second preset duration t min If so, control the air-conditioning system to execute the second determination; otherwise, control the air-conditioning system to exit the cold storage mode.

3. The control method of the air conditioning system according to claim 2, characterized in that: When the accumulated cold storage time is less than or equal to the first preset time t max Afterwards, before controlling the air conditioning system to enter the cold storage mode, the control method of the air conditioning system further includes: It is determined whether the accumulated freezing time of the accumulator is less than or equal to a third preset time t1. If so, the air conditioning system is controlled to enter the cold storage mode; otherwise, the air conditioning system is controlled to exit the cold storage mode.

4. The control method of the air conditioning system according to claim 3, characterized in that: After obtaining that the accumulated freezing time is less than or equal to the third preset time t1, before controlling the air conditioning system to enter the cold storage mode, the control method of the air conditioning system further includes: Determine whether the water level in the accumulator is less than or equal to a preset height H1. If so, control the air conditioning system to enter the cold storage mode; otherwise, control the air conditioning system to exit the cold storage mode.

5. The control method of the air conditioning system according to claim 1, characterized in that: The control method of the air conditioning system further includes: When the operation period of the air-conditioning system is in the second electricity price period, a third determination is performed: determining whether the startup rate of the plurality of air-conditioning indoor units of the air-conditioning system is greater than or equal to a preset startup rate X%, If the determination results of the first determination and the third determination are both yes, the air-conditioning system is controlled to enter the cooling release mode; otherwise, the air-conditioning system is controlled to exit the cooling release mode.

6. The control method of the air conditioning system according to claim 1, characterized in that: The control method of the air conditioning system further includes: When the operation period of the air conditioning system is in the second electricity price period, a fourth determination is performed: determining whether the frequency of the compressor of the air conditioning system is greater than or equal to a preset frequency f1, If the determination results of the first determination and the fourth determination are both yes, the air-conditioning system is controlled to enter the cooling release mode; otherwise, the air-conditioning system is controlled to exit the cooling release mode.

7. The control method of the air conditioning system according to claim 1, characterized in that: The control method of the air conditioning system further includes: When the operation period of the air conditioning system is in the second electricity price period, a fifth determination is performed: determining whether the maximum pressure of the air conditioning system is greater than or equal to a preset value T1, If the determination results of the first determination and the fifth determination are both yes, the air-conditioning system is controlled to enter the cooling release mode; otherwise, the air-conditioning system is controlled to exit the cooling release mode.

8. The control method of the air conditioning system according to claim 1, characterized in that: The control side of the air conditioning system also includes: When the air-conditioning system is in the cooling release mode, monitor whether the inlet pipe temperature of the accumulator is less than or equal to the difference between the outlet liquid temperature of the subcooler of the air-conditioning system and the subcooling degree T2 increased by the cooling release mode. If so, control the air-conditioning system to continue the cooling release mode; otherwise, control the air-conditioning system to exit the cooling release mode.

9. The control method of the air conditioning system according to claim 1, characterized in that: The control method of the air conditioning system further includes: Determine whether the air conditioning system is in the whole machine cooling mode, and when the air conditioning system is in the whole machine cooling mode, execute the instruction of controlling the air conditioning system to enter the cold storage mode or the cold release mode; otherwise, control the air conditioning system to exit the cold storage mode or the cold release mode; and / or receiving a user's instruction and controlling the air conditioning system to enter or exit the cold storage mode or the cold release mode according to the instruction; and / or Detect whether any one or more of the plurality of air-conditioning indoor units of the air-conditioning system are performing cooling, and if so, control the air-conditioning system to exit the cold storage mode.

10. A control device for an air conditioning system, characterized in that: For executing the control method of the air conditioning system according to any one of claims 1 to 9, the control device of the air conditioning system comprises: A first judgment unit, used to judge whether the operation period of the air conditioning system is in the first electricity price period or the second electricity price period; a first control unit, configured to control the air conditioning system to enter or exit the cold storage mode according to the water temperature of the accumulator of the air conditioning system, the accumulated cold storage time of the air conditioning system in the cold storage mode, and the accumulated cold release time of the air conditioning system in the cold release mode when the operation period of the air conditioning system is in the first electricity price period; The second judgment unit is used to perform a first judgment when the operation period of the air conditioning system is in the second electricity price period: judging whether the water temperature of the accumulator is less than or equal to a first preset temperature T max ; The second control unit is used to control the air-conditioning system to enter the cooling release mode when the determination result of the first determination is yes; otherwise, control the air-conditioning system to exit the cooling release mode.

11. An air conditioning system, characterized in that: A control device for an air conditioning system comprising the control device of claim 10.

12. A non-volatile storage medium, characterized in that: The non-volatile storage medium includes a stored program, wherein when the program is executed, the device where the non-volatile storage medium is located is controlled to execute the control method of the air-conditioning system according to any one of claims 1 to 9.

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