Method and device for controlling defrosting by heat accumulation and air conditioning unit

Abstract

This invention discloses a heat storage defrosting control method, device, and air conditioning unit. The method includes: acquiring the operating parameters of the air conditioning unit in heat storage heating mode and reverse circulation defrosting mode during the current operating cycle; wherein, the heat storage heating mode is a mode in which the air conditioning unit stores heat in a heat storage device while providing heating; determining whether the heat storage capacity of the heat storage device matches the current demand based on the operating parameters of the heat storage heating mode and the reverse circulation defrosting mode; and adjusting the control parameters of the heat storage device for the next operating cycle when the heat storage capacity does not match the current demand. This invention solves the problem in the prior art where the heat storage capacity of the heat storage device does not match the demand, resulting in excessive heat storage leading to energy waste or insufficient heat storage leading to poor defrosting performance. It avoids the waste of heat storage and reduces the phenomenon of insufficient heat release, saving electricity costs while improving the user experience.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to a heat storage defrosting control method, device, and air conditioning unit. Background Technology

[0002] During the heating process of an air conditioning system, when the surface temperature of the outdoor heat exchanger is low, the outdoor heat exchanger is prone to frost formation, affecting its heat exchange efficiency. The conventional defrosting method is to switch the refrigerant flow direction using a four-way valve to absorb indoor heat for defrosting the outdoor heat exchanger. However, during the defrosting process, the indoor temperature drops, affecting user comfort.

[0003] Existing technologies include solutions for air conditioner defrosting using heat storage. In an air conditioner's operating cycle, heat is stored and used for heating during periods without defrosting needs, and released for defrosting during periods requiring it. However, during periods of high electricity prices, heat storage requires additional energy consumption, thus not saving on operating costs. Other solutions utilize off-peak electricity prices at night for heat storage and use it for defrosting during peak daytime prices. However, these solutions do not consider whether the nighttime heat storage and daytime heat release are matched, nor do they address any mismatch in adjusting heat storage and release for the following day. This can result in either excessive heat storage leading to wasted energy, or insufficient heat storage resulting in poor defrosting and a reduced user experience.

[0004] There is currently no effective solution to the problem of mismatch between the heat storage capacity of the heat accumulator and the demand in related technologies, which results in excessive heat storage leading to energy waste or insufficient heat storage leading to poor defrosting performance. Summary of the Invention

[0005] This invention provides a heat storage defrosting control method, device, and air conditioning unit to at least solve the problem in the prior art where the heat storage capacity of the heat storage device does not match the demand, resulting in excessive heat storage leading to energy waste or insufficient heat storage leading to poor defrosting effect.

[0006] To address the aforementioned technical problems, according to one aspect of the present invention, a heat storage defrosting control method is provided, applied to an air conditioning unit with a heat storage device, the method comprising:

[0007] Obtain the operating parameters of the air conditioning unit in the heat storage heating mode and the reverse circulation defrosting mode during the current operating cycle; wherein, the heat storage heating mode is the mode in which the air conditioning unit stores heat in the heat storage device while providing heating.

[0008] Determine whether the heat storage capacity of the heat storage unit matches the current demand based on the operating parameters of the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode.

[0009] When the heat storage capacity does not match the current demand, adjust the control parameters of the heat accumulator for the next operating cycle.

[0010] Furthermore, based on the operating parameters of the heat storage heating mode and the reverse circulation defrosting mode, it is determined whether the heat storage capacity of the heat accumulator matches the current demand, including:

[0011] Determine whether the heat storage capacity of the heat accumulator is too small or too large based on the operating parameters of the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode.

[0012] If the heat storage capacity of the heat accumulator is too small or too large, it indicates that the heat storage capacity does not match the current demand.

[0013] Furthermore, when the heat storage capacity does not match the current demand, the control parameters of the heat accumulator are adjusted for the next operating cycle, including:

[0014] When the heat storage capacity of the heat accumulator is too small, increase the heat storage capacity of the heat accumulator;

[0015] When the heat storage capacity of the heat accumulator is too large, the heat storage capacity of the heat accumulator is reduced. The heat storage capacity of the heat accumulator is represented by the preset heat storage temperature of the heat accumulator. The higher the preset heat storage temperature of the heat accumulator, the stronger the heat storage capacity.

[0016] Furthermore, the operating parameters of the thermal storage heating mode should at least include: the number of times the thermal storage heating mode is run (N1) and the total operating time (t1) of the thermal storage heating mode; the operating parameters of the reverse circulation defrosting mode should at least include: the number of times the reverse circulation defrosting mode is run (N2); determining whether the heat storage capacity of the thermal accumulator is too small or too large based on the operating parameters of the thermal storage heating mode and the reverse circulation defrosting mode includes:

[0017] Determine whether the operating parameters of the thermal storage heating mode and the reverse circulation defrosting mode meet one of the following conditions: If so, then the heat storage capacity of the heat accumulator is too small;

[0018] Determine whether the operating parameters of the thermal storage heating mode and the reverse circulation defrosting mode simultaneously meet the following conditions: If so, it is determined that the heat storage capacity of the heat accumulator is too large; where n is the proportionality coefficient, A and C are the number of times threshold, B and D are the time threshold, and A > C, B > D.

[0019] Furthermore, before obtaining the operating parameters of the air conditioning unit in heat storage heating mode and reverse circulation defrosting mode during the current operating cycle, the following steps are also included:

[0020] Determine the current operating stage of the air conditioning unit; the current operating stage includes at least: a stage with no heating demand and a stage with heating demand.

[0021] When there is no heating demand during the current operating phase, heat storage is carried out according to the heat storage capacity of the heat accumulator.

[0022] When the current operating phase requires heating, a heat storage device is used to assist the air conditioning unit in defrosting.

[0023] Furthermore, determining the current operating stage of the air conditioning unit includes:

[0024] Determine whether the current time is after the heating demand phase of the previous operating cycle and before the heating demand phase of the current operating cycle, whether the air conditioning unit has a heating demand, and whether the ambient temperature is higher than the preset ambient temperature.

[0025] If the current time is after the heating demand phase of the previous operating cycle and before the heating demand phase of the current operating cycle, the air conditioning unit has a heating demand, and the ambient temperature is greater than the first preset temperature, then the current operating phase of the air conditioning unit is determined to be the no heating demand phase.

[0026] Otherwise, determine that the current operating stage of the air conditioning unit is a stage with heating demand.

[0027] Furthermore, heat storage is carried out according to the heat storage capacity of the heat accumulator, including:

[0028] Determine if the temperature of the heat accumulator is lower than the preset heat storage temperature;

[0029] If so, the heat storage device will be controlled to store heat, and the air conditioning unit will not produce heat.

[0030] Otherwise, if the heat storage device is kept warm, the air conditioning unit will not produce heat.

[0031] Furthermore, the use of a heat accumulator to assist the air conditioning unit in defrosting includes:

[0032] During the defrosting process of the current defrosting cycle, determine whether the temperature of the heat accumulator is lower than the first preset temperature;

[0033] If so, then run the reverse defrost mode;

[0034] Otherwise, a heat accumulator is used for heat storage and defrosting.

[0035] Furthermore, the use of a heat accumulator for heat storage defrosting includes:

[0036] At the end of the defrosting process in the current defrosting cycle, determine whether the heat storage temperature is greater than the second preset temperature;

[0037] If so, during the non-defrosting process of entering the next defrosting cycle, run the heating mode and control the heat accumulator to keep it warm;

[0038] Otherwise, during the non-defrosting process of the next defrosting cycle, the heat storage heating mode will be operated.

[0039] Furthermore, during the non-defrosting process of the next defrosting cycle, after running the heating mode and controlling the heat accumulator to keep warm, the process also includes: continuing to maintain the heating mode and controlling the heat accumulator to keep warm during the non-defrosting process of the next defrosting cycle.

[0040] During the non-defrosting process of entering the next defrosting cycle, after running the heat storage heating mode, the process also includes: determining whether the temperature of the heat storage unit is lower than the third preset temperature during the non-defrosting process of the next defrosting cycle; if so, maintaining the heat storage heating mode; otherwise, running the heating mode and controlling the heat storage unit to keep warm.

[0041] Furthermore, it also includes:

[0042] Obtain the operating parameters of the air conditioning unit in the heat storage heating mode and the reverse circulation defrosting mode during the peak electricity price period in the current operating cycle;

[0043] Determine whether the target heat storage capacity of the heat storage device matches the current demand based on the operating parameters of the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode.

[0044] When the target heat storage capacity of the heat accumulator does not match the current demand, adjust the control parameters of the heat accumulator for the next operating cycle.

[0045] Furthermore, the operating parameters of the thermal storage heating mode include at least: the number of times the thermal storage heating mode is run (N3) and the total operating time (t2) of the thermal storage heating mode; the operating parameters of the reverse circulation defrosting mode include at least: the number of times the reverse circulation defrosting mode is run (N4); based on the operating parameters of the thermal storage heating mode and the reverse circulation defrosting mode, it is determined whether the target heat storage capacity of the thermal accumulator matches the current demand, including:

[0046] Determine whether the operating parameters of the thermal storage heating mode and the reverse circulation defrosting mode meet one of the following conditions: If so, then the target heat storage capacity of the heat accumulator is too small;

[0047] Determine whether the operating parameters of the thermal storage heating mode and the reverse circulation defrosting mode simultaneously meet the following conditions: If so, then the target heat storage capacity of the heat accumulator is determined to be too large; where m is the proportionality coefficient, E and G are the number thresholds, F and H are the time thresholds, and E > G, F > H.

[0048] Furthermore, the control parameters of the heat accumulator include at least: a second preset temperature and a third preset temperature; adjusting the control parameters of the heat accumulator in the next operating cycle includes:

[0049] If the target heat storage capacity of the heat accumulator is too small, the values ​​of the second and third preset temperatures in the next operating cycle will be increased.

[0050] If the target heat storage capacity of the heat accumulator is too large, the values ​​of the second and third preset temperatures in the next operating cycle will be lowered.

[0051] According to another aspect of the present invention, a heat storage defrosting control device is provided, applied to an air conditioning unit having a heat storage tank, the device comprising:

[0052] The acquisition module is used to acquire the operating parameters of the air conditioning unit in the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode during the current operating cycle; wherein, the heat storage heating mode is the mode in which the air conditioning unit stores heat in the heat storage device while providing heating.

[0053] The judgment module is used to determine whether the heat storage capacity of the heat storage unit matches the current demand based on the operating parameters of the heat storage heating mode and the operating parameters of the reverse cycle defrosting mode.

[0054] The adjustment module is used to adjust the control parameters of the heat accumulator for the next operating cycle when the heat storage capacity does not match the current demand.

[0055] According to another aspect of the present invention, an air conditioning unit is provided, including the heat storage defrosting control device as described above.

[0056] According to another aspect of the present invention, a storage medium containing computer-executable instructions is provided, which, when executed by a computer processor, are used to perform the heat storage defrosting control method as described above.

[0057] This invention proposes a heat storage defrosting control scheme for air conditioning units with heat storage tanks. By analyzing the heat storage and defrosting data from each operating cycle, the heat storage demand for the next operating cycle is adjusted. This results in a better match between stored and released heat, preventing waste of stored heat and reducing insufficient heat release, thus saving electricity costs and improving the user experience. Furthermore, this control scheme reduces the likelihood of the system simultaneously entering heating mode and performing heat storage and reverse defrosting during periods of heating demand the following day. It also avoids the operational fluctuations caused by frequent mode switching during heating periods and the problem of excessively high unit output demand. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of an optional structure of an air conditioning unit according to an embodiment of the present invention;

[0059] Figure 2 This is an optional flowchart of a heat storage defrosting control method according to an embodiment of the present invention;

[0060] Figure 3 This is a segmented schematic diagram of a situation with and without heating demand according to an embodiment of the present invention.

[0061] Figure 4This is another optional flowchart of the heat storage defrosting control method according to an embodiment of the present invention;

[0062] Figure 5 This is a schematic diagram of the air conditioning heat storage defrosting control stage according to an embodiment of the present invention;

[0063] Figure 6 This is an optional flowchart of a time-of-use electricity pricing control method according to an embodiment of the present invention;

[0064] Figure 7 This is an optional demonstration example diagram of the time-of-use electricity pricing control logic according to an embodiment of the present invention;

[0065] Figure 8 This is an optional structural block diagram of a heat storage defrosting control device according to an embodiment of the present invention.

[0066] Explanation of reference numerals in the attached figures:

[0067] 1. Outdoor unit; 2. Energy storage equipment; 3. Liquid side main pipe; 4. Gas side main pipe; 101. Compressor; 102. Gas-liquid separator; 103. Subcooler; 104. Four-way valve; 105. Outdoor heat exchanger; 106. Heating electronic expansion valve; 107. Subcooling electronic expansion valve; 201. Heat accumulator; 201a. First end of heat accumulator; 201b. Second end of heat accumulator; 202. First gas pipe; 203. Second gas pipe; 204. First liquid pipe; 205. Second liquid pipe; 206. Energy storage electronic expansion valve; 207. Cold storage check valve; 208. High-pressure gas valve; 209. Cold release check valve; 210. Heat release valve; 211. Bypass valve; 212. Cold release valve; 213. Third liquid pipe; 214. Liquid separator. Detailed Implementation

[0068] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0069] Example 1

[0070] In a preferred embodiment of the present invention, a heat storage defrosting control method is provided. This control method can be directly applied to air conditioning units with heat storage devices. Figure 1 This diagram illustrates one possible structure of the air conditioning unit. This method can also be applied to other air conditioning units with heat storage devices.

[0071] like Figure 1As shown, the air conditioning unit includes: an outdoor unit 1, an energy storage device 2, a liquid-side main pipe 3, a gas-side main pipe 4, a compressor 101, a gas-liquid separator 102, a subcooler 103, a four-way valve 104, an outdoor heat exchanger 105, a heating electronic expansion valve 106, a subcooling electronic expansion valve 107, a heat accumulator 201, a first end 201a of the heat accumulator, a second end 201b of the heat accumulator, a first gas pipe 202, a second gas pipe 203, a first liquid pipe 204, a second liquid pipe 205, an energy storage electronic expansion valve 206, a cold storage check valve 207, a high-pressure gas valve 208, a cold release check valve 209, a heat release valve 210, a bypass valve 211, a cold release valve 212, a third liquid pipe 213, and a liquid separator 214.

[0072] During heat storage in the accumulator, the four-way valve 104 is energized, opening the bypass valve 211, high-pressure gas valve 208, and cold release valve 212. The energy storage electronic expansion valve 206 and heat release valve 210 are closed, while the outdoor electronic expansion valve 106 is open. The refrigerant discharged from the compressor 101 enters the accumulator 201 via the first gas pipe 202 and the second liquid pipe 205 for condensation. It then flows out through the third liquid pipe 213 and into the liquid-side main pipe 3, flowing into the outdoor heat exchanger 105 for evaporation, and returning to the gas-liquid separator 102 and the compressor 101's suction side. In this mode, the accumulator 201 acts as a condenser, and the outdoor heat exchanger 105 acts as an evaporator. At this time, gaseous refrigerant enters from the second end 201b of the accumulator, and after condensation, liquid refrigerant flows out from the first end 201a of the accumulator.

[0073] During defrosting, the four-way valve 104 is de-energized. The heat release valve 210 and the outdoor electronic expansion valve 106 open, while the bypass valve 211, high-pressure gas valve 208, and cold release valve 212 close, and the energy storage electronic expansion valve 206 opens. The refrigerant discharged from the compressor 101 condenses in the outdoor heat exchanger 105 and enters the liquid-side main pipe 3. After being throttled at the energy storage electronic expansion valve 206 via the first liquid pipe 204, it enters the heat accumulator 201 for evaporation, and then returns to the gas-liquid separator 102 and the suction side of the compressor 101 via the second gas pipe 203. In this mode, the heat accumulator 201 acts as the evaporator, and the outdoor heat exchanger 105 acts as the condenser. At this time, the two-phase refrigerant enters from the first end 201a of the heat accumulator via the liquid separator 214, and the gaseous refrigerant after evaporation flows out from the second end 201b of the heat accumulator.

[0074] Based on air conditioning units with heat storage devices, this invention proposes a heat storage defrosting method. Figure 2 An optional flowchart of the method is shown, such as Figure 2 As shown, the method includes the following steps S202-S208:

[0075] S202: Obtain the operating parameters of the air conditioning unit in the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode during the current operating cycle; wherein, the heat storage heating mode is the mode in which the air conditioning unit stores heat in the heat storage device while providing heating.

[0076] S204: Determine whether the heat storage capacity of the heat storage unit matches the current demand based on the operating parameters of the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode;

[0077] S206: When the heat storage capacity does not match the current demand, adjust the control parameters of the heat storage device in the next operating cycle; the control parameters of the heat storage device in the next operating cycle mainly refer to the control parameters of the heat storage device in the stage of no heating demand in the next operating cycle. Heat storage is carried out in the stage of no heating demand so that the heat storage device can be used to assist defrosting in the stage of heating demand.

[0078] S208: Maintain the control parameters of the heat accumulator when the heat storage capacity matches the current demand.

[0079] In the above embodiments, a heat storage defrosting control scheme is proposed for air conditioning units with heat storage tanks. This scheme adjusts the heat storage demand for the next operating cycle based on the heat storage and defrosting status of each operating cycle, thereby better matching the stored and released heat. This avoids waste of stored heat and reduces insufficient heat release, saving electricity costs while improving the user experience. Furthermore, this control scheme reduces the possibility of the system simultaneously entering heating mode and performing heat storage and reverse defrosting during periods of heating demand the following day. It also avoids the operational fluctuations caused by frequent mode switching during heating demand and the problem of excessively high unit output demand.

[0080] Specifically, the operation parameters of the thermal storage heating mode and the reverse circulation defrosting mode are used to determine whether the thermal accumulator's heat storage capacity matches the current demand. This includes: determining whether the thermal accumulator's heat storage capacity is too low or too high based on the operating parameters of these modes; if the heat storage capacity is too low or too high, it is determined that the thermal storage capacity does not match the current demand. Both the thermal storage heating mode and the reverse circulation defrosting mode are operating modes used when the thermal accumulator's heat storage capacity is insufficient; therefore, their operating parameters can reflect whether the thermal accumulator's heat storage capacity is sufficient.

[0081] Specifically, the operating parameters for the heat storage heating mode should include at least: the number of times the heat storage heating mode is operated (N1) and the total operating time (t1) of the heat storage heating mode; the operating parameters for the reverse circulation defrosting mode should include at least: the number of times the reverse circulation defrosting mode is operated (N2). This means statistically analyzing the number of times and the duration the air conditioner enters heating and heat storage mode on a given day (the air conditioner's operating cycle is measured in days; the following examples use one day as an operating cycle). This improves the heat storage capacity during the non-heating demand phase of the following day, reducing the possibility of the system simultaneously entering heating mode and performing reverse circulation defrosting during the heating demand phase. This reduces the operational fluctuations caused by frequent mode switching when heating is needed, as well as the problem of excessively high unit output demand. Furthermore, the heat storage for the following day should be adjusted based on the day's operating conditions to adapt to the daily temperature changes during the heating season. For example, as autumn transitions into winter, temperatures gradually decrease, and the demand for defrosting gradually increases. The previously sufficient heat storage will gradually become insufficient for defrosting, therefore, the heat storage for the following day needs to be adjusted according to the daily situation.

[0082] In a preferred embodiment of the present invention, determining whether the heat storage capacity of the heat accumulator is too small or too large based on the operating parameters of the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode includes:

[0083] Determine whether the operating parameters of the thermal storage heating mode and the reverse circulation defrosting mode meet one of the following conditions: If so, it is determined that the heat storage capacity of the accumulator is too small. When the heat storage capacity of the accumulator is too small, the heat storage capacity of the accumulator is increased; the heat storage capacity during the no-heating-demand stage is increased by x%, and the preset heat storage temperature is increased by y. Here, n is a proportionality coefficient, representing the equivalent number of reverse-cycle defrosting cycles. Since the need for reverse-cycle defrosting indicates a severe heat shortage in the accumulator, requiring a significant increase in its heat storage capacity, a positive integer greater than 1 is chosen as the equivalent number of reverse-cycle defrosting cycles, n, for example, n = 2. A is the frequency threshold; when the sum of the total number of times the accumulator operates in heat storage heating mode and the equivalent number of reverse-cycle defrosting cycles is ≥ A, it indicates that the heat storage capacity of the accumulator is insufficient. B is the time threshold; if the total operating time of the heat storage heating mode is ≥ B, it also indicates that the heat storage capacity of the accumulator is insufficient, necessitating heat storage during the heating-demand stage to compensate for the shortfall. When the above conditions are met, the heat storage capacity requirement during the no-heating-demand stage is increased, and the upper temperature limit is also increased to improve the heat storage capacity during this stage. The specific values ​​of A, B, x, and y can be defined, for example, A is 2, B is 20 min, x is 10, and y is 2℃.

[0084] Determine whether the operating parameters of the thermal storage heating mode and the reverse circulation defrosting mode simultaneously meet the following conditions: If so, it is determined that the heat storage capacity of the accumulator is too large. When the above conditions are met simultaneously, it is considered that the target heat storage capacity of the accumulator is too large and can be appropriately reduced to save input during periods of no heating demand. In this case, the heat storage capacity during periods of no heating demand in the next day will be reduced by x%, and the preset heat storage temperature will be reduced by y. For example, C is 0 times, D is 0 minutes, and x and y can be the same as or different from the values ​​when the heat storage capacity is insufficient.

[0085] The above control scheme is a method for adjusting the control parameters of the heat accumulator. Prior to this, the control of the air conditioning unit mainly included the following steps:

[0086] Determine the current operating stage of the air conditioning unit; this stage includes at least two phases: a period with no heating demand and a period with heating demand. During the heating season, heat needs to be provided to the building during the daytime, which is the period with heating demand. For commercial applications, this period generally coincides with working hours. Figure 3 This diagram illustrates a segmented representation of areas with and without heating demand, such as... Figure 3 As shown, the period from 8:30 to 17:30 is the heating demand phase. For the heating-demand-free phase, the following conditions must be met to define it as such, thus indicating the time period for heat storage: ① The time falls after the end of the heating demand phase of the previous day and before the start of the heating demand phase of the current day; ② There is no heating demand; ③ The ambient temperature is above Ta. Condition ③ is given because when the ambient temperature is low, heat storage is not suitable, even if conditions ① and ② are met, it is excluded from the scope of this invention and heat storage is not performed. The specific value of Ta can be defined by the user, for example, 0°C. Since the heating-demand-free phase begins from the end of the heating demand phase of the previous day, a portion of it falls in the evening of the previous day.

[0087] When the current operating phase is a period without heating demand, heat storage is performed according to the heat storage capacity of the heat storage unit. This includes: determining whether the temperature of the heat storage unit is lower than the preset heat storage temperature; if so, controlling the heat storage unit to store heat, and the air conditioning unit not providing heating; otherwise, controlling the heat storage unit to maintain its temperature, and the air conditioning unit not providing heating. If the time is a period without heating demand, it is determined whether the temperature of the heat storage unit is lower than the preset heat storage temperature. If so, it operates in a mode where the heat storage unit stores heat and the air conditioning unit does not provide heating. If not, it operates in a mode where the heat storage unit maintains its temperature and the air conditioning unit does not provide heating. In this way, when the temperature of the heat storage unit rises to the preset heat storage temperature, it stops operating and enters a heat preservation mode, ensuring that the heat storage unit stores sufficient heat.

[0088] When the current operating phase requires heating, a heat storage device is used to assist the air conditioning unit in defrosting. This includes: during the defrosting process of the current defrosting cycle, determining whether the temperature of the heat storage device is lower than a first preset temperature; if so, operating in reverse cycle defrosting mode; otherwise, using the heat storage device for defrosting. While the air conditioner is in the defrosting process, the heat storage device's temperature is used to determine if it has failed. If the temperature of the heat storage device is lower than the first preset temperature, the heat storage device has failed, and defrosting cannot be performed using the heat storage device; only reverse cycle defrosting mode can be used.

[0089] The defrosting process using a heat storage device includes: at the end of the defrosting process in the current defrosting cycle, determining whether the temperature of the stored heat is greater than a second preset temperature; if so, operating in heating mode and controlling the heat storage device to maintain its temperature during the non-defrosting process of the next defrosting cycle; otherwise, operating in heat storage heating mode during the non-defrosting process of the next defrosting cycle. If the temperature of the heat storage device is greater than or equal to the first preset temperature, defrosting is performed using the heat storage device. At the end of the defrosting process, the temperature of the heat storage device is used to determine whether heat storage is needed to replenish the stored heat in the next defrosting cycle. If the temperature of the heat storage device is greater than the second preset temperature, then during the non-defrosting process of the next defrosting cycle, heat storage is not required, and instead, heat storage device insulation and air conditioning heating mode are used. If the temperature of the heat storage device is less than or equal to the second preset temperature, then during the non-defrosting process of the next defrosting cycle, the heat storage heating mode is used.

[0090] During the non-defrost process of entering the next defrost cycle, after operating the heating mode and controlling the heat accumulator to maintain its temperature, the process further includes: continuing to maintain the heating mode and controlling the heat accumulator to maintain its temperature during the non-defrost process of the next defrost cycle; after operating the heat storage heating mode during the non-defrost process of the next defrost cycle, the process further includes: determining whether the temperature of the heat accumulator is lower than the third preset temperature during the non-defrost process of the next defrost cycle. If so, the heat storage heating mode is maintained; otherwise, the heating mode is operated and the heat accumulator is controlled to maintain its temperature. When the air conditioner is in the non-defrost process, it is determined whether it entered the non-defrost process in the mode of heat storage and air conditioning heating. If so, it is further determined whether to end the heat storage and air conditioning heating mode based on the heat accumulator temperature. If the heat accumulator temperature is less than the third preset temperature, the heat storage and air conditioning heating mode continues to operate; if the heat accumulator temperature is greater than or equal to the third preset temperature, the heat accumulator stops storing heat and enters the heat preservation mode, while the air conditioner heats up.

[0091] In the above method, during periods of heating demand, the heat accumulator's real-time temperature is used to control whether it stores heat during the air conditioning heating process, ensuring sufficient stored heat for defrosting each time. Furthermore, in case of heat accumulator failure, reverse-cycle defrosting is used as a safety measure. Additionally, the accumulator temperature at the end of the next day's off-peak / peak hours is adjusted based on the day's operating conditions to adapt to gradual weather changes.

[0092] In a preferred embodiment 1 of the present invention, another method for controlling heat storage defrosting is also provided, specifically... Figure 4 An optional flowchart of the method is shown, such as Figure 4 As shown, the method includes the following steps S401-S421:

[0093] S401: Determine the time; First, determine whether the time is in a stage with no heating demand or a stage with heating demand.

[0094] S402: Stage with no heating requirement;

[0095] S403: Determine whether the condition of the heat storage temperature being less than the preset heat storage temperature is met. If it is, proceed to S405; otherwise, proceed to S404. If the time is in a stage where there is no heating demand, determine whether the temperature of the heat storage is less than the preset heat storage temperature.

[0096] S404: Heat accumulator is kept warm, air conditioner does not heat; if the temperature of the heat accumulator is lower than the preset heat accumulator temperature, it will operate in the mode of heat accumulator storing heat and air conditioner not heating.

[0097] S405: The heat accumulator stores heat, and the air conditioner does not heat. If the temperature of the heat accumulator is greater than or equal to the preset heat accumulator temperature, it will operate in a mode where the heat accumulator is kept warm and the air conditioner does not heat. This way, when the heat accumulator temperature rises to the preset temperature, it stops operating and enters a heat preservation mode, ensuring that the heat accumulator stores sufficient heat. The preset heat accumulator temperature can be defined by the user; a recommended value is 38℃.

[0098] S406: Stage where heating is required;

[0099] S407: Defrosting process; if the time is during a period of heating demand, determine whether the air conditioner has entered the defrosting process;

[0100] S408: Determine whether the condition of heat accumulator temperature < T1 (first preset temperature) is true. If yes, proceed to S409; otherwise, proceed to S411. When the air conditioner is in the defrosting process, determine whether the heat accumulator has failed based on the heat accumulator temperature.

[0101] S409: Heat accumulator failure;

[0102] S410: Reverse cycle defrosting; If the temperature of the heat accumulator is <T1, the heat accumulator fails and defrosting cannot be performed using the heat accumulator. Only the reverse cycle defrosting mode can be used for defrosting.

[0103] S411: Defrosting of the heat accumulator; if the temperature of the heat accumulator is ≥ T1, then defrosting of the heat accumulator is used.

[0104] S412: When the defrosting process ends, determine whether the accumulator temperature > T2 (second preset temperature) is true. If yes, proceed to S414; otherwise, proceed to S413. When the defrosting process ends, determine whether the accumulator needs to be recharged to replenish the stored heat in the next defrosting cycle based on the accumulator temperature.

[0105] S413: When entering the next defrost cycle, the heat accumulator stores heat and the air conditioner provides heating; if the temperature of the heat accumulator is ≤ T2 at this time, then during the non-defrost process of entering the next defrost cycle, it will operate in the mode of heat accumulator storing heat and air conditioner providing heating.

[0106] S414: When entering the next defrost cycle, the heat accumulator is kept warm and the air conditioner is used for heating; if the temperature of the heat accumulator is greater than T2 at this time, then during the non-defrost process of entering the next defrost cycle, it is not necessary to store heat in the heat accumulator again, but the heat accumulator is kept warm and the air conditioner is used for heating.

[0107] S415: Non-defrosting process;

[0108] S416: Whether the air conditioner enters the non-defrosting process in the mode of heat storage and air conditioning heating; if yes, proceed to S417, otherwise proceed to S419; when the air conditioner is in the non-defrosting process, determine whether it enters the non-defrosting process in the mode of heat storage and air conditioning heating; if the air conditioner is in the non-defrosting process and does not enter the non-defrosting process in the mode of heat storage and air conditioning heating, but enters the non-defrosting process in the mode of heat storage and air conditioning heating, then the mode of heat storage and air conditioning heating will continue to run.

[0109] S417: Determine whether the condition of heat storage temperature < T3 (third preset temperature) is true. If yes, proceed to S418; otherwise, proceed to S419. If yes, further determine whether to end the heat storage and air conditioning heating mode based on the heat storage temperature.

[0110] S418: Heat storage in a heat accumulator, used for heating in an air conditioner;

[0111] S419: Heat storage unit insulation, air conditioning heating;

[0112] S420: After the heating demand phase ends, record the number of times N1 the heat storage heating mode is used, the total duration t1, and the number of times N2 the reverse cycle defrost is used within the day.

[0113] S421: Adjust the heat storage capacity during the period with no heating demand on the next day according to N1, N2 and t1, and return to step S401.

[0114] The values ​​of T1, T2, and T3 can all be defined. A recommended value for T1 is 25℃, for T2 it is 35℃, and for T3 it is 18℃.

[0115] Figure 5 A schematic diagram of the air conditioning heat storage defrosting control stage in this invention is shown, as follows: Figure 5 As shown, initially, during the no-heating-demand phase, the heat accumulator stores heat, raising the temperature to the preset storage temperature. Since there is no heating demand, the air conditioner does not heat at this time. Next, defrosting cycle 1 begins. Before the outdoor heat exchanger frosts over, the air conditioner can heat normally, while the heat accumulator maintains a constant temperature. When defrosting is needed, the heat accumulator releases heat, causing the temperature to drop from the preset storage temperature. After defrosting, the temperature remains above T1, so the system enters the non-defrosting process of defrosting cycle 2, maintaining heat accumulator temperature and air conditioner heating mode. In defrosting cycle 2, heat accumulator temperature maintenance and air conditioner heating continue. When defrosting is needed, the heat accumulator releases heat, and the temperature gradually drops below T1. Therefore, the system enters the non-defrosting process of defrosting cycle 3, maintaining heat accumulator temperature and air conditioner heating mode. In defrosting cycle 3, heat accumulator temperature maintenance and air conditioner heating continue, gradually raising the temperature of the heat accumulator to T2. Then, heat accumulator storage ends, and the heat accumulator maintains its temperature. When defrosting is needed, the heat accumulator releases heat again.

[0116] The above method controls whether the heat accumulator stores heat during the air conditioning heating process based on the real-time temperature of the heat accumulator during the heating phase, ensuring sufficient stored heat for defrosting each time. Furthermore, in the event of heat accumulator failure, reverse-cycle defrosting is used as a safety measure.

[0117] As the background art points out, existing technologies, when storing heat in thermal storage devices, do not consider the impact of time-of-use electricity pricing and do not provide an implementation plan for using low-priced heat storage to save electricity costs, thus failing to achieve the goal of saving electricity costs. Based on this, the present invention also proposes a time-of-use electricity pricing control strategy, in which electricity price ranges are distinguished, including:

[0118] Electricity price flat / off-peak periods: These are time intervals when electricity prices are in flat or off-peak periods. Because regulations vary by province and city, flat and off-peak periods are defined together without distinction. For example... Figure 3 As shown, 0:00~10:00, 12:00~15:00, and 17:00~24:00 are all considered to be periods of flat / off-peak electricity prices.

[0119] Peak electricity price period: the time interval during which electricity prices are at their peak, such as... Figure 3As shown, 10:00–12:00 and 15:00–17:00 are both peak electricity price periods.

[0120] End of Peak / Off-Peak Electricity Price Period: A period can be defined as the end of a peak / off-peak electricity price period if the following conditions are met: ① The time falls within the peak / off-peak electricity price period; ② The time falls within the time interval ta (the time period before the peak electricity price period). ta can be defined, with a recommended value of 1 hour. For example... Figure 3 As shown, 9:00–10:00 and 14:00–15:00 are both at the end of the off-peak electricity price period.

[0121] Early to mid-stage of the electricity price flat / valley period: The time interval that falls within the electricity price flat / valley period but is not at the end of the electricity price flat / valley period is defined as the early to mid-stage of the electricity price flat / valley period. For example... Figure 3 As shown, 0:00~9:00, 12:00~14:00, and 17:00~24:00 all belong to the early to mid-term of the electricity price flat / valley period.

[0122] In the time-of-use electricity pricing control logic, the control methods during the heating demand phase are further adjusted according to the time-of-use electricity pricing policy. Figure 6 This illustrates an optional flowchart of the time-of-use pricing method, such as... Figure 6 The process, as shown, includes the following steps:

[0123] S601: Determine the time; Based on the time-of-use pricing policy, determine the early to mid-term of the flat / valley period, the end of the flat / valley period, and the peak period for each day;

[0124] S602: Electricity price flat / off-peak periods;

[0125] S603: Electricity price flat / off-peak period (early to mid-term);

[0126] S604: Execute basic control logic according to T2 and T3;

[0127] S605: End of off-peak electricity price period;

[0128] S606: Execute basic control logic according to T2' and T3'; at the end of the flat / valley period of electricity price, increase the temperature standard of the heat storage device so that the heat storage device can store more heat in advance before entering the peak period of electricity price, reduce the heat storage demand in the peak period of electricity price, and reduce the operating electricity cost;

[0129] S507: Peak electricity price period;

[0130] S508: Executes basic control logic according to T2 and T3.

[0131] The heating demand phase will be further subdivided according to electricity price into the early to mid-peak period of the off-peak / flat period, the end of the off-peak / flat period, and the peak period. During the early to mid-peak and peak periods, the basic control logic will still be followed. However, at the end of the off-peak / flat period, T2 will be replaced by T2', and T3 by T3', with T2' > T2 and T3' > T3. This way, as the off-peak / flat period is about to end and the peak period begins, the temperature threshold will be increased, raising the heat storage temperature of the thermal accumulator and thus increasing the heat storage capacity. This aims to minimize the possibility of heat storage demand during the peak period and reduce operating electricity costs during that time. The specific values ​​of T2' and T3' can be defined by the user; a recommended value for T2' is T2 + 2℃, and for T3' is T3 + 2℃.

[0132] A demonstration example of time-of-use pricing control logic is as follows: Figure 7 As shown. First, during the early to mid-stages of the off-peak electricity price period, in defrost cycle 1, the basic control logic continues. During the non-defrost process, heat is stored to bring the accumulator temperature to T3. During the defrost process, heat is released for defrosting, causing the temperature to drop, but it remains above T2. Therefore, during the non-defrost process of defrost cycle 2, the accumulator is kept warm. During the defrost process of defrost cycle 2, the accumulator temperature drops below T1. Therefore, during the non-defrost process of defrost cycle 3, heat is stored in the accumulator to bring its temperature back to T3. During the defrost process of defrost cycle 3, the accumulator temperature drops, but it remains above T2. Therefore, during the non-defrost process of defrost cycle 4, the accumulator is kept warm. During the non-defrost process of defrost cycle 4, the electricity price transitions from the early to mid-stages of the off-peak period to the end of the off-peak period. At this time, although the accumulator temperature is higher than T2, it is lower than T2'. Therefore, heat storage is needed in the accumulator to raise its temperature to T3'. During the defrosting process, the heat accumulator releases heat to defrost, causing the temperature to drop, but it remains above T2'. Therefore, heat accumulator insulation is performed during the non-defrosting phase of defrosting cycle 5. During the defrosting phase of defrosting cycle 5, the heat accumulator temperature drops below T2'. Therefore, heat storage is performed during the non-defrosting phase of defrosting cycle 6. During the non-defrosting phase of defrosting cycle 6, the electricity price peak period begins. At this time, although the heat accumulator temperature is below T3', it is above T3. Therefore, heat accumulator insulation is performed until the defrosting process continues.

[0133] The process of adjusting T2 and T3 to T2' and T3' specifically includes: obtaining the operating parameters of the air conditioning unit in the heat storage heating mode and the reverse circulation defrosting mode during the peak electricity price period in the current operating cycle; determining whether the target heat storage capacity of the heat storage unit matches the current demand based on the operating parameters of the heat storage heating mode and the reverse circulation defrosting mode; and adjusting the control parameters of the heat storage unit in the next operating cycle when the target heat storage capacity of the heat storage unit does not match the current demand. By statistically analyzing the operating parameters of the heat storage heating mode and the reverse circulation defrosting mode during the peak electricity price period, the standard temperature of the heat storage unit at the end of the flat / valley electricity price period the following day is increased to further reduce the heat storage demand during the peak electricity price period the following day, thereby further reducing operating electricity costs.

[0134] The operating parameters for the thermal storage heating mode include at least: the number of times the thermal storage heating mode is run (N3) and the total operating time (t2) of the thermal storage heating mode; the operating parameters for the reverse circulation defrosting mode include at least: the number of times the reverse circulation defrosting mode is run (N4); based on the operating parameters of the thermal storage heating mode and the reverse circulation defrosting mode, it is determined whether the target heat storage capacity of the thermal accumulator matches the current demand, including:

[0135] Determine whether the operating parameters of the thermal storage heating mode and the reverse circulation defrosting mode meet one of the following conditions: If so, it is determined that the target heat storage capacity of the thermal accumulator is too small. During operation, record the number of times and duration of operation in thermal storage heating mode during peak electricity price periods, as well as the number of reverse cycle defrosting operations. After a full day of operation, calculate the total number of times N3 and total duration t2 of operation in thermal storage heating mode during the peak electricity price periods of that day, and the number of reverse cycle defrosting operations N4. If the above conditions are met, the second preset temperature v and the third preset temperature w will be increased the following day. The specific values ​​of m, E, F and v, w can be defined. A recommended value for m is 2, a recommended value for E is 1 time, a recommended value for F is 10 minutes, a recommended value for v is 2℃, and a recommended value for w is 2℃.

[0136] Determine whether the operating parameters of the thermal storage heating mode and the reverse circulation defrosting mode simultaneously meet the following conditions: If so, the target heat storage capacity of the heat accumulator is determined to be too large; where m is a proportionality coefficient, E > G, F > H. The target heat storage capacity of the heat accumulator is considered too large when the following conditions are met, and it can be appropriately reduced. In this case, the second preset temperature v is lowered the following day, and the third preset temperature w is lowered. A recommended value for G is 0 min, and a recommended value for H is 0 min. v and w can be the same as or different from the values ​​when the target heat storage capacity is too large.

[0137] The above solution ensures sufficient heat storage during defrosting, reducing the likelihood of reverse-cycle defrosting. It allows the heat storage mode to operate primarily during periods of low heating demand, ensuring the heat accumulator is adequately filled with heat before the heating demand phase begins, thus avoiding frequent activation of the heating and heat storage mode during peak periods. By storing heat in advance at the end of off-peak electricity price periods, the necessity for peak-price heat storage is reduced, thereby lowering operating electricity costs.

[0138] Example 2

[0139] Based on the heat storage defrosting control method provided in Embodiment 1 above, a heat storage defrosting control device is also provided in a preferred embodiment 2 of the present invention. Specifically, Figure 7 An alternative structural block diagram of the device is shown, such as... Figure 7 As shown, the device includes:

[0140] The acquisition module 702 is used to acquire the operating parameters of the air conditioning unit in the heat storage heating mode and the operating parameters of the reverse cycle defrosting mode during the current operating cycle; wherein, the heat storage heating mode is the mode in which the air conditioning unit stores heat in the heat storage device while providing heating.

[0141] The judgment module 704, connected to the acquisition module 702, is used to determine whether the heat storage capacity of the heat storage device matches the current demand based on the operating parameters of the heat storage heating mode and the operating parameters of the reverse cycle defrosting mode.

[0142] The adjustment module 706, connected to the judgment module 704, is used to adjust the control parameters of the heat accumulator in the next operating cycle when the heat storage capacity does not match the current demand.

[0143] In the above embodiments, a heat storage defrosting control scheme is proposed for air conditioning units with heat storage tanks. This scheme adjusts the heat storage demand for the next operating cycle based on the heat storage and defrosting status of each operating cycle, thereby better matching the stored and released heat. This avoids waste of stored heat and reduces insufficient heat release, saving electricity costs while improving the user experience. Furthermore, this control scheme reduces the possibility of the system simultaneously entering heating mode and performing heat storage and reverse defrosting during periods of heating demand the following day. It also avoids the operational fluctuations caused by frequent mode switching during heating demand and the problem of excessively high unit output demand.

[0144] The judgment module 704 includes: a first judgment submodule, used to judge whether the heat storage capacity of the heat storage device is too small or too large based on the operating parameters of the heat storage heating mode and the operating parameters of the reverse cycle defrosting mode; and a first determination submodule, used to determine that the heat storage capacity does not match the current demand when the heat storage capacity of the heat storage device is too small or too large.

[0145] The adjustment module 706 includes: a first adjustment submodule, used to increase the heat storage capacity of the heat accumulator when the heat storage capacity of the heat accumulator is too small; and a second adjustment submodule, used to reduce the heat storage capacity of the heat accumulator when the heat storage capacity of the heat accumulator is too large; wherein, the heat storage capacity of the heat accumulator is represented by the preset heat storage temperature of the heat accumulator, and the higher the preset heat storage temperature of the heat accumulator, the stronger the heat storage capacity.

[0146] The operating parameters of the thermal storage heating mode include at least: the number of times the thermal storage heating mode is run N1 and the total operating time t1; the operating parameters of the reverse circulation defrosting mode include at least: the number of times the reverse circulation defrosting mode is run N2.

[0147] The first judgment submodule includes: a first judgment unit, used to determine whether the operating parameters of the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode meet one of the following conditions: If so, then the heat storage capacity of the heat accumulator is too small;

[0148] The second judgment unit is used to determine whether the operating parameters of the thermal storage heating mode and the operating parameters of the reverse circulation defrosting mode simultaneously meet the following conditions: If so, it is determined that the heat storage capacity of the heat accumulator is too large; where n is the proportionality coefficient, A and C are the number of times threshold, B and D are the time threshold, and A > C, B > D.

[0149] The device further includes: a stage module, used to determine the current operating stage of the air conditioning unit before acquiring the operating parameters of the air conditioning unit in the heat storage heating mode and the operating parameters of the reverse cycle defrosting mode within the current operating cycle; wherein the current operating stage includes at least: a stage with no heating demand and a stage with heating demand; a first control module, used to store heat according to the heat storage capacity of the heat storage device when the current operating stage is a stage with no heating demand; and a second control module, used to use the heat storage device to assist the air conditioning unit in defrosting when the current operating stage is a stage with heating demand.

[0150] The phase module includes: a second judgment submodule, used to determine whether the current time is after the heating demand phase of the previous operating cycle and before the heating demand phase of the current operating cycle, whether the air conditioning unit has a heating demand, and whether the ambient temperature is greater than the preset ambient temperature; and a second determination submodule, used to determine that the current operating phase of the air conditioning unit is a no-heating-demand phase if the current time is after the heating demand phase of the previous operating cycle and before the heating demand phase of the current operating cycle, the air conditioning unit has a heating demand, and the ambient temperature is greater than the first preset temperature; otherwise, it determines that the current operating phase of the air conditioning unit is a heating demand phase.

[0151] The first control module includes: a third judgment unit, used to judge whether the temperature of the heat storage unit is lower than the preset heat storage temperature; a first control unit, used to control the heat storage unit to store heat and the air conditioning unit not to heat if the temperature is lower; and a second control unit, used to control the heat storage unit to keep the temperature warm and the air conditioning unit not to heat if the temperature is lower.

[0152] The second control module includes: a fourth judgment unit, used to determine whether the temperature of the heat accumulator is lower than the first preset temperature during the defrosting process of the current defrosting cycle; a third control unit, used to run the reverse cycle defrosting mode if the temperature is lower; and a fourth control unit, used to use the heat accumulator for heat storage defrosting if the temperature is lower.

[0153] The fourth control unit includes: a judgment subunit, used to determine whether the temperature of the heat storage is greater than the second preset temperature at the end of the defrosting process of the current defrosting cycle; a first control subunit, used to, if yes, run the heating mode and control the heat storage unit to keep warm during the non-defrosting process of the next defrosting cycle; and a second control subunit, used to, otherwise, run the heat storage heating mode during the non-defrosting process of the next defrosting cycle.

[0154] The fourth control unit also includes: a holding subunit, which, after operating the heating mode and controlling the heat accumulator to keep warm during the non-defrosting process of the next defrosting cycle, continues to maintain the heating mode and control the heat accumulator to keep warm during the non-defrosting process of the next defrosting cycle.

[0155] The fourth control unit also includes a third control subunit, which is used to determine whether the temperature of the heat storage unit is lower than the third preset temperature during the non-defrosting process of the next defrosting cycle after running the heat storage heating mode. If so, the heat storage heating mode is maintained; otherwise, the heating mode is run and the heat storage unit is kept warm.

[0156] The second control module also includes: an acquisition submodule, used to acquire the operating parameters of the air conditioning unit in the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode during the peak electricity price period in the current operating cycle; a third judgment submodule, used to determine whether the target heat storage capacity of the heat storage unit matches the current demand based on the operating parameters of the heat storage heating mode and the reverse circulation defrosting mode; and an adjustment submodule, used to adjust the control parameters of the heat storage unit in the next operating cycle when the target heat storage capacity of the heat storage unit does not match the current demand.

[0157] The operating parameters for the thermal storage heating mode include at least: the number of times the thermal storage heating mode is run (N3) and the total operating time (T2); the operating parameters for the reverse circulation defrosting mode include at least: the number of times the reverse circulation defrosting mode is run (N4); the third judgment submodule includes:

[0158] The fifth judgment unit is used to determine whether the operating parameters of the thermal storage heating mode and the operating parameters of the reverse circulation defrosting mode meet one of the following conditions: If so, then the target heat storage capacity of the heat accumulator is too small;

[0159] The sixth judgment unit is used to determine whether the operating parameters of the thermal storage heating mode and the operating parameters of the reverse circulation defrosting mode simultaneously meet the following conditions: If so, then the target heat storage capacity of the heat accumulator is determined to be too large; where m is the proportionality coefficient, E and G are the number thresholds, F and H are the time thresholds, and E > G, F > H.

[0160] Optionally, the control parameters of the heat storage device include at least: a second preset temperature and a third preset temperature; the adjustment submodule includes: when the target heat storage capacity of the heat storage device is too small, increasing the values ​​of the second preset temperature and the third preset temperature in the next operating cycle; when the target heat storage capacity of the heat storage device is too large, decreasing the values ​​of the second preset temperature and the third preset temperature in the next operating cycle.

[0161] Regarding the apparatus in the above embodiments, the specific manner in which each unit and module performs its operations has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0162] Example 3

[0163] Based on the heat storage defrosting control device provided in Embodiment 2 above, a preferred embodiment 3 of the present invention further provides an air conditioning unit, including the heat storage defrosting control device as described above. The structure of this air conditioning unit is as follows... Figure 1 As shown.

[0164] In the above embodiments, a heat storage defrosting control scheme is proposed for air conditioning units with heat storage tanks. This scheme adjusts the heat storage demand for the next operating cycle based on the heat storage and defrosting status of each operating cycle, thereby better matching the stored and released heat. This avoids waste of stored heat and reduces insufficient heat release, saving electricity costs while improving the user experience. Furthermore, this control scheme reduces the possibility of the system simultaneously entering heating mode and performing heat storage and reverse defrosting during periods of heating demand the following day. It also avoids the operational fluctuations caused by frequent mode switching during heating demand and the problem of excessively high unit output demand.

[0165] Example 4

[0166] Based on the heat storage defrosting control method provided in Embodiment 1 above, in a preferred embodiment 4 of the present invention, a storage medium containing computer-executable instructions is also provided, wherein the computer-executable instructions are used to execute the heat storage defrosting control method as described above when executed by a computer processor.

[0167] In the above embodiments, a heat storage defrosting control scheme is proposed for air conditioning units with heat storage tanks. This scheme adjusts the heat storage demand for the next operating cycle based on the heat storage and defrosting status of each operating cycle, thereby better matching the stored and released heat. This avoids waste of stored heat and reduces insufficient heat release, saving electricity costs while improving the user experience. Furthermore, this control scheme reduces the possibility of the system simultaneously entering heating mode and performing heat storage and reverse defrosting during periods of heating demand the following day. It also avoids the operational fluctuations caused by frequent mode switching during heating demand and the problem of excessively high unit output demand.

[0168] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not invented by the invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0169] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A heat storage defrosting control method, applied to an air conditioning unit with a heat storage device, characterized in that, The method includes: The operating parameters of the air conditioning unit in the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode are obtained in the current operating cycle; wherein, the heat storage heating mode is the mode in which the air conditioning unit stores heat for the heat storage device while providing heating. Determine whether the heat storage capacity of the heat storage device matches the current demand based on the operating parameters of the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode; including: determining whether the heat storage capacity of the heat storage device is too small or too large based on the operating parameters of the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode; if the heat storage capacity of the heat storage device is too small or too large, determine that the heat storage capacity does not match the current demand; When the heat storage capacity does not match the current demand, adjust the control parameters of the heat storage device for the next operating cycle. The operating parameters of the heat storage heating mode include at least: the number of times the heat storage heating mode is run N1, and the total operating time t1 of the heat storage heating mode; the operating parameters of the reverse circulation defrosting mode include at least: the number of times the reverse circulation defrosting mode is run N2; determining whether the heat storage capacity of the heat accumulator is too small or too large based on the operating parameters of the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode includes: Determine whether the operating parameters of the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode meet one of the following conditions: If so, then it is determined that the heat storage capacity of the heat accumulator is too small; Determine whether the operating parameters of the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode simultaneously meet the following conditions: If so, then it is determined that the heat storage capacity of the heat accumulator is too large; where n is the proportionality coefficient, A and C are the number of times threshold, B and D are the time threshold, and A > C, B > D.

2. The method according to claim 1, characterized in that, When the heat storage capacity does not match the current demand, the control parameters of the heat storage device are adjusted for the next operating cycle, including: When the heat storage capacity of the heat accumulator is too small, the heat storage capacity of the heat accumulator is increased. When the heat storage capacity of the heat accumulator is too large, the heat storage capacity of the heat accumulator is reduced; wherein, the heat storage capacity of the heat accumulator is represented by the preset heat storage temperature of the heat accumulator, and the higher the preset heat storage temperature of the heat accumulator, the stronger the heat storage capacity.

3. The method according to claim 1, characterized in that, Before obtaining the operating parameters of the air conditioning unit in the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode during the current operating cycle, the method further includes: Determine the current operating stage of the air conditioning unit; wherein the current operating stage includes at least: a stage with no heating demand and a stage with heating demand; When the current operating phase is the phase with no heating demand, heat is stored according to the heat storage capacity of the heat storage device; When the current operating phase is the phase with heating demand, the heat storage device is used to assist the air conditioning unit in defrosting.

4. The method according to claim 3, characterized in that, Determining the current operating stage of the air conditioning unit includes: Determine whether the current time is after the heating demand phase of the previous operating cycle and before the heating demand phase of the current operating cycle, whether the air conditioning unit has a heating demand, and whether the ambient temperature is greater than the preset ambient temperature. If the current time is after the heating demand stage of the previous operating cycle and before the heating demand stage of the current operating cycle, the air conditioning unit has a heating demand, and the ambient temperature is greater than the preset ambient temperature, then the current operating stage of the air conditioning unit is determined to be the no heating demand stage. Otherwise, the current operating stage of the air conditioning unit is determined to be the stage with heating demand.

5. The method according to claim 3, characterized in that, Heat storage is performed according to the heat storage capacity of the heat accumulator, including: Determine whether the temperature of the heat accumulator is lower than the preset heat storage temperature; If so, the heat storage device is controlled to store heat, and the air conditioning unit does not produce heat; Otherwise, the heat storage device is kept warm, and the air conditioning unit does not produce heat.

6. The method according to claim 3, characterized in that, The use of the heat accumulator to assist the air conditioning unit in defrosting includes: During the defrosting process of the current defrosting cycle, it is determined whether the temperature of the heat accumulator is lower than the first preset temperature; If so, then run the reverse-loop defrosting mode; Otherwise, the heat accumulator is used for heat storage and defrosting.

7. The method according to claim 6, characterized in that, Using the aforementioned heat accumulator for heat storage defrosting includes: When the defrosting process of the current defrosting cycle ends, it is determined whether the temperature of the heat storage is greater than the second preset temperature; If so, during the non-defrosting process of entering the next defrosting cycle, the heating mode is activated and the heat accumulator is kept warm. Otherwise, during the non-defrosting process of the next defrosting cycle, the heat storage heating mode is operated.

8. The method according to claim 7, characterized in that, During the non-defrosting process of entering the next defrosting cycle, after running the heating mode and controlling the heat accumulator to keep warm, the process further includes: continuing to maintain the heating mode and controlling the heat accumulator to keep warm during the non-defrosting process of the next defrosting cycle. During the non-defrosting process of entering the next defrosting cycle, after running the heat storage heating mode, the method further includes: during the non-defrosting process of the next defrosting cycle, determining whether the temperature of the heat storage device is lower than a third preset temperature; if so, maintaining the heat storage heating mode; otherwise, running the heating mode and controlling the heat storage device to maintain its temperature.

9. The method according to claim 8, characterized in that, Also includes: Obtain the operating parameters of the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode of the air conditioning unit during the peak electricity price period in the current operating cycle; Based on the operating parameters of the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode, determine whether the target heat storage capacity of the heat storage device matches the current demand; When the target heat storage capacity of the heat accumulator does not match the current demand, the control parameters of the heat accumulator are adjusted for the next operating cycle.

10. The method according to claim 9, characterized in that, The operating parameters of the heat storage heating mode include at least: the number of times the heat storage heating mode is run N3, and the total operating time t2 of the heat storage heating mode; the operating parameters of the reverse circulation defrosting mode include at least: the number of times the reverse circulation defrosting mode is run N4; determining whether the target heat storage capacity of the heat storage device matches the current demand based on the operating parameters of the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode includes: Determine whether the operating parameters of the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode meet one of the following conditions: If so, then it is determined that the target heat storage capacity of the heat accumulator is too small; Determine whether the operating parameters of the heat storage heating mode and the operating parameters of the reverse circulation defrosting mode simultaneously meet the following conditions: If so, then the target heat storage capacity of the heat storage device is determined to be too large; where m is the proportionality coefficient, E and G are the number thresholds, F and H are the time thresholds, and E > G, F > H.

11. The method according to claim 10, characterized in that, The control parameters of the heat storage device include at least: the second preset temperature and the third preset temperature; adjusting the control parameters of the heat storage device in the next operating cycle includes: When the target heat storage capacity of the heat accumulator is too small, the values ​​of the second preset temperature and the third preset temperature in the next operating cycle are increased. When the target heat storage capacity of the heat accumulator is too large, the values ​​of the second preset temperature and the third preset temperature in the next operating cycle are lowered.

12. A heat storage defrosting control device, applied to an air conditioning unit with a heat storage tank, for implementing the heat storage defrosting control method according to any one of claims 1 to 11, characterized in that, The device includes: The acquisition module is used to acquire the operating parameters of the air conditioning unit in the heat storage heating mode and the operating parameters of the reverse cycle defrosting mode during the current operating cycle; wherein, the heat storage heating mode is the mode in which the air conditioning unit stores heat for the heat storage device while providing heating. The judgment module is used to determine whether the heat storage capacity of the heat storage device matches the current demand based on the operating parameters of the heat storage heating mode and the operating parameters of the reverse cycle defrosting mode. An adjustment module is used to adjust the control parameters of the heat storage device in the next operating cycle when the heat storage capacity does not match the current demand.

13. An air conditioning unit, characterized in that, Includes the heat storage defrosting control device as described in claim 12.

14. A storage medium containing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a computer processor, are used to perform the heat storage defrosting control method as described in any one of claims 1 to 11.

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