Control method and device for central air conditioner, central air conditioner and storage medium

Abstract

The application relates to the technical field of intelligent household appliances, and discloses a control method for a central air conditioner, the central air conditioner comprising a plurality of terminal devices, the method comprising: obtaining temperature regulation requirements of each terminal device; corresponding to each temperature regulation requirement, counting the number of terminal devices with the temperature regulation requirement; determining a system temperature regulation requirement of the central air conditioner according to the number corresponding to each temperature regulation requirement; and adjusting a chilled water main pipe temperature difference set value according to the system temperature regulation requirement. The number of terminal devices corresponding to different temperature regulation requirements is counted, and the system temperature regulation requirement of the central air conditioner is determined according to the number, so as to adjust the chilled water main pipe temperature difference set value. The system temperature regulation requirement of the central air conditioner can more accurately reflect the temperature regulation requirements of more terminal devices, thereby facilitating the improvement of the accuracy of the operation regulation of the central air conditioner. The application further discloses a control device for the central air conditioner, the central air conditioner and a storage medium.

Description

Technical Field

[0001] This application relates to the field of central air conditioning technology, such as a control method, control device, central air conditioning unit, and storage medium for central air conditioning. Background Technology

[0002] In traditional central air conditioning systems, the unit operates for cooling and heating according to a set water temperature, without considering the load on the indoor terminals. Users manually adjust the unit's set outlet water temperature based on the indoor temperature to meet their actual needs. However, this reliance on manual control is complex and can easily lead to excessively cold or hot indoor environments, causing discomfort to users.

[0003] A control method for central air conditioning is provided in the related technology, including: obtaining the average room temperature difference of the terminal equipment; in the case of cooling, if the temperature difference is greater than or equal to a first preset threshold, setting the outlet water temperature of the unit according to the temperature step segment; when the temperature difference remains unchanged or decreases, using a lower temperature step as the outlet water temperature of the unit.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] Using the average temperature difference of terminal devices as the basis for judging the adjustment demand, individual extreme cases can significantly affect the average value, leading to inaccurate judgment of adjustment demand and causing most terminal devices to be too cold or too hot, affecting user comfort.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a control method, control device, central air conditioner, and storage medium for central air conditioning, to improve the accuracy of central air conditioning regulation and better meet the actual needs of users.

[0009] In some embodiments, the central air conditioner includes multiple terminal devices, and the method includes: obtaining the temperature adjustment requirements of each terminal device; corresponding to each temperature adjustment requirement, counting the number of terminal devices with this temperature adjustment requirement; determining the system temperature adjustment requirement of the central air conditioner according to the number corresponding to each temperature adjustment requirement; and adjusting the set value of the total pipe temperature difference of the chilled water according to the system temperature adjustment requirement.

[0010] Optionally, obtaining the temperature adjustment requirements of each terminal device includes: obtaining the ambient temperature in the space where each terminal device is located; and determining the temperature adjustment requirement of the terminal device according to the set temperature of the terminal device and the ambient temperature corresponding to this terminal device.

[0011] Optionally, determining the temperature adjustment requirement of the terminal device according to the set temperature of the terminal device and the ambient temperature corresponding to this terminal device includes: calculating the temperature difference between the ambient temperature and the set temperature in the space where the terminal device is located; in the cooling condition, if the temperature difference is greater than the first temperature threshold, determining that the temperature adjustment requirement of this terminal device is to strengthen the temperature adjustment; if the temperature difference is less than the second temperature threshold, determining that the temperature adjustment requirement of this terminal device is to weaken the temperature adjustment; where the first temperature threshold is greater than or equal to 0; the second temperature threshold is less than or equal to 0.

[0012] Optionally, determining the temperature adjustment requirement of the terminal device according to the set temperature of the terminal device and the ambient temperature corresponding to this terminal device includes: calculating the temperature difference between the ambient temperature and the set temperature in the space where the terminal device is located; in the heating condition, if the temperature difference is greater than the third temperature threshold, determining that the temperature adjustment requirement of this terminal device is to weaken the temperature adjustment requirement; if the temperature difference is less than the fourth temperature threshold, determining that the temperature adjustment requirement of this terminal device is to strengthen the temperature adjustment requirement; where the third temperature threshold is greater than or equal to 0; the fourth temperature threshold is less than or equal to 0.

[0013] Optionally, determining the system temperature adjustment requirement of the central air conditioner according to the number corresponding to each temperature adjustment requirement includes: if n - m > A, determining that the system temperature adjustment requirement is to strengthen the temperature adjustment; if n - m < B, determining that the system temperature adjustment requirement is to weaken the temperature adjustment; where n is the number of terminal devices with the temperature adjustment requirement of strengthening the temperature adjustment, m is the number of terminal devices with the temperature adjustment requirement of weakening the temperature adjustment; A is the upper limit threshold of the number, B is the lower limit threshold of the number, and B ≤ 0 ≤ A.

[0014] Optionally, adjusting the set value of the total pipe temperature difference of the chilled water according to the system temperature adjustment requirement includes: if the system temperature adjustment requirement is to strengthen the temperature adjustment, reducing the set value of the total pipe temperature difference of the chilled water; if the system temperature adjustment requirement is to weaken the temperature adjustment, increasing the set value of the total pipe temperature difference of the chilled water.

[0015] Optionally, reducing the set value of the main pipe temperature of the chilled water includes: determining the reduction amount of the main pipe temperature difference set value according to the difference between n and m; adjusting the main pipe temperature difference set value according to the reduction amount so that the main pipe temperature difference set value is reduced.

[0016] Optionally, determining the reduction amount of the main pipe temperature difference set value according to the difference between n and m includes: when A1 < n - m ≤ A2, determining the reduction amount of the main pipe temperature difference set value as the first set value k1; when n - m > A2, determining the reduction amount of the main pipe temperature difference set value as the second set value k2; where A1 is the first upper limit value, A2 is the second upper limit value, and A1 < A2; k1 < k2.

[0017] Optionally, increasing the set value of the main pipe temperature difference of the chilled water includes: determining the increase amount of the main pipe temperature difference set value according to the difference between n and m; adjusting the main pipe temperature difference set value according to the increase amount so that the main pipe temperature difference set value is increased.

[0018] Optionally, determining the increase amount of the main pipe temperature difference set value according to the difference between n and m includes: when B2 ≤ n - m < B1, determining the increase amount of the main pipe temperature difference set value as t1; when n - m < B2, determining the increase amount of the main pipe temperature difference set value as t2; where B1 is the first lower limit value, B2 is the second lower limit value, and B2 < B1; t1 < t2.

[0019] Optionally, after determining the system temperature adjustment requirement of the central air conditioner according to the quantity corresponding to each temperature adjustment requirement, it further includes: adjusting the water outlet temperature of the unit according to the system temperature adjustment requirement.

[0020] Optionally, adjusting the water outlet temperature of the unit according to the system temperature adjustment requirement includes: in the refrigeration condition, if the system temperature adjustment requirement is to strengthen the temperature adjustment, reducing the water outlet temperature of the unit; if the system temperature adjustment requirement is to weaken the temperature adjustment, increasing the water outlet temperature of the unit.

[0021] In some embodiments, the control device includes a processor and a memory storing program instructions, and the processor is configured to execute the above control method for the central air conditioner when running the program instructions.

[0022] In some embodiments, the central air conditioner includes a plurality of terminal devices, and further includes: a central air conditioner body, and the above control device for the central air conditioner, which is installed on the body.

[0023] The control method, control device, central air conditioner and storage medium provided by the embodiments of the present disclosure can achieve the following technical effects:

[0024] When a central air conditioning system includes multiple terminal units, the temperature regulation requirements of each terminal unit are obtained. The number of terminal units corresponding to different temperature regulation requirements is counted, and the system temperature regulation requirement of the central air conditioning system is determined based on the number of terminal units corresponding to each temperature regulation requirement. This allows for adjustment of the chilled water main pipe temperature difference setpoint. In this way, the system temperature regulation requirement of the central air conditioning system can more accurately reflect the temperature regulation requirements of more terminal units, thereby improving the accuracy of central air conditioning operation regulation.

[0025] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0026] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0027] Figure 1 This is a schematic diagram of a control method for a central air conditioning system provided in an embodiment of this disclosure;

[0028] Figure 2 This is a schematic diagram of another control method for a central air conditioning system provided in an embodiment of this disclosure;

[0029] Figure 3 This is a schematic diagram of another control method for a central air conditioning system provided in an embodiment of this disclosure;

[0030] Figure 4 This is a schematic diagram of another control method for a central air conditioning system provided in an embodiment of this disclosure;

[0031] Figure 5 This is a schematic diagram of a control device for a central air conditioning system provided in an embodiment of this disclosure;

[0032] Figure 6 This is a schematic diagram of a central air conditioning system provided in an embodiment of this disclosure. Detailed Implementation

[0033] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0034] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0035] Unless otherwise stated, the term "multiple" means two or more.

[0036] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0037] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0038] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0039] Central air conditioning systems include chiller units, chilled water circulation systems, cooling water circulation systems, and multiple terminal devices. These terminal devices are located in multiple spaces and are configured to regulate the temperature within their respective spaces.

[0040] In traditional central air conditioning systems, chiller units operate for cooling and heating according to a set water temperature, without automatically assessing the load on indoor terminal equipment. Users manually adjust the unit's set outlet water temperature based on the indoor temperature to meet their needs. However, this reliance on manual control is complex. Furthermore, inaccurate user assessments can easily lead to excessively cold or hot indoor environments, causing discomfort for users.

[0041] A control method for central air conditioning is provided in the related technology, including: obtaining the average room temperature difference of the terminal equipment; in the case of cooling, if the temperature difference is greater than or equal to a first preset threshold, setting the outlet water temperature of the unit according to the temperature stage; when the temperature difference remains unchanged or decreases, using a lower temperature step as the outlet water temperature of the unit.

[0042] As can be seen, the above control methods can adjust the operation of the central air conditioning system according to actual needs. However, using the average temperature difference as the basis for judging the adjustment needs can lead to significant impacts on the average temperature difference in extreme cases, such as a large temperature difference between one or two rooms. This can result in inaccurate judgment of the adjustment needs, causing the space where the terminal equipment is located to be too cold or too hot, thus affecting user comfort.

[0043] To improve the accuracy of central air conditioning adjustments and better meet users' actual needs, combined with Figure 1 As shown in the figure, this disclosure provides a control method for a central air conditioning system, including:

[0044] S101, the processor obtains the temperature regulation requirements of each end device.

[0045] S102, for each type of temperature regulation requirement, the processor counts the number of end devices with that temperature regulation requirement.

[0046] S103, the processor determines the system temperature regulation requirements of the central air conditioning system based on the quantity corresponding to each temperature regulation requirement.

[0047] S104, the processor adjusts the main chilled water temperature difference setting value according to the system temperature regulation requirements.

[0048] The control method for central air conditioning provided in this disclosure, when the central air conditioning system includes multiple terminal devices, obtains the temperature regulation requirements of each terminal device, counts the number of terminal devices corresponding to different temperature regulation requirements, and determines the system temperature regulation requirements of the central air conditioning system based on the number of terminal devices corresponding to each temperature regulation requirement, thereby adjusting the setpoint of the chilled water main pipe temperature difference. In this way, the system temperature regulation requirements of the central air conditioning system can more accurately reflect the temperature regulation requirements of more terminal devices, thereby improving the accuracy of the operation and regulation of the central air conditioning system.

[0049] Furthermore, some existing technologies, when determining that current operating conditions cannot meet cooling demands, directly lower the unit's outlet water temperature. While this better meets cooling requirements, it reduces the cooling efficiency ratio. This solution, however, adjusts the chilled water main pipe temperature difference setpoint to regulate the cooling capacity transport rate. In this case, the unit's outlet water temperature remains unchanged, thus maintaining the energy efficiency ratio. This approach ensures that the central air conditioning system operates in accordance with actual needs while also considering its energy efficiency ratio.

[0050] Optionally, temperature regulation requirements include: strengthening temperature regulation and weakening temperature regulation. Strengthening temperature regulation means that the current operation of the central air conditioning system cannot meet the temperature regulation requirements and needs to be further strengthened. Weakening temperature regulation means that the current operation of the central air conditioning system has fully met or even exceeded the temperature regulation requirements and needs to reduce the operating intensity.

[0051] In other embodiments, the temperature regulation requirement may also include maintaining the temperature. That is, the current operating conditions just meet the operating requirements, and no further adjustments are needed.

[0052] Combination Figure 2As shown, this disclosure provides another control method for a central air conditioning system, including:

[0053] S201, the processor obtains the ambient temperature of the space where each end device is located.

[0054] The space where the terminal device is located is equipped with a sensing device that communicates with the terminal device and is configured to detect the ambient temperature in the space where the terminal device is located.

[0055] S202, the processor determines the temperature regulation requirements of the terminal device based on the set temperature of the terminal device and the corresponding ambient temperature of the terminal device.

[0056] S203, for each type of temperature regulation requirement, the processor counts the number of end devices with that temperature regulation requirement.

[0057] S204, the processor determines the system temperature regulation requirements of the central air conditioning system based on the quantity corresponding to each temperature regulation requirement.

[0058] S205, the processor adjusts the main chilled water temperature difference setting value according to the system temperature regulation requirements.

[0059] After adjusting the chilled water main pipe temperature difference setpoint, the correlation between the adjusted main pipe temperature difference setpoint and the ambient temperature and set temperature of the terminal equipment can be recorded as historical data, which can be matched and retrieved in subsequent operations. Algorithmic analysis can be performed on the historical data to further optimize the main pipe temperature difference setpoint.

[0060] Optionally, the processor determines the temperature regulation requirement of the terminal device based on the set temperature of the terminal device and the corresponding ambient temperature. This includes: the processor calculating the temperature difference between the ambient temperature and the set temperature within the space where the terminal device is located. In cooling mode, if the temperature difference is greater than a first temperature threshold, the processor determines that the temperature regulation requirement of the terminal device is to strengthen temperature regulation. If the temperature difference is less than a second temperature threshold, the processor determines that the temperature regulation requirement of the terminal device is to weaken temperature regulation. The first temperature threshold is greater than or equal to 0; the second temperature threshold is less than or equal to 0.

[0061] In this embodiment of the disclosure, the temperature difference between the ambient temperature and the set temperature in the space where the terminal device is located is the difference between the ambient temperature and the set temperature.

[0062] In cooling mode, if the temperature difference is greater than the first temperature threshold, it means that the ambient temperature is greater than the sum of the set temperature and the first temperature threshold. At this time, the ambient temperature is too high and cooling needs to be strengthened. Therefore, the temperature regulation requirement is to strengthen the temperature regulation. If the temperature difference is less than the second temperature threshold, it means that the ambient temperature is less than the sum of the set temperature and the second temperature threshold. At this time, the ambient temperature is too low. In order to make the ambient temperature closer to the set temperature, cooling needs to be weakened. Therefore, the temperature regulation requirement is to weaken the temperature regulation.

[0063] Optionally, the first temperature threshold is between 1°C and 3°C, for example, 2°C.

[0064] Optionally, the second temperature threshold is between -3°C and -1°C, for example, -2°C.

[0065] In other embodiments, temperature regulation requirements may also include maintaining temperature regulation. That is, the current operating conditions meet the operational requirements, and no further adjustments are needed. In cooling mode, if the temperature difference is less than or equal to a first temperature threshold and greater than or equal to a second temperature threshold, the processor determines that the temperature regulation requirement of the terminal device is maintaining temperature regulation. At this time, the ambient temperature is relatively close to the set temperature, and it is determined that the operation of the central air conditioning system meets the current temperature regulation requirements.

[0066] Optionally, the processor determines the temperature regulation requirement of the terminal device based on the set temperature of the terminal device and the corresponding ambient temperature. This includes: the processor calculating the temperature difference between the ambient temperature and the set temperature within the space where the terminal device is located. Under heating conditions, if the temperature difference is greater than a third temperature threshold, the processor determines that the temperature regulation requirement of the terminal device is a reduced temperature regulation requirement. If the temperature difference is less than a fourth temperature threshold, the processor determines that the temperature regulation requirement of the terminal device is a strengthened temperature regulation requirement. The third temperature threshold is greater than or equal to 0; the fourth temperature threshold is less than or equal to 0.

[0067] In heating mode, if the temperature difference is greater than the third temperature threshold, the ambient temperature is greater than the sum of the set temperature and the third temperature threshold. At this time, the ambient temperature is too high compared to the set temperature, and the heating process needs to be weakened to better approach the set temperature. Therefore, the temperature regulation requirement is determined to be weakened. If the temperature difference is less than the fourth temperature threshold, the ambient temperature is less than the sum of the set temperature and the fourth temperature threshold. At this time, the ambient temperature is too low compared to the set temperature, and the heating process needs to be strengthened to approach the set temperature. Therefore, the temperature regulation requirement is determined to be strengthened.

[0068] Optionally, the third temperature threshold can be set to a value between 1°C and 3°C, for example, 2°C.

[0069] Optionally, the fourth temperature threshold is taken as -3°C to -1°C, for example, -2°C.

[0070] Combination Figure 3 As shown, an embodiment of the present disclosure provides a control method for a central air conditioner, including:

[0071] S301, the processor obtains the temperature adjustment requirements of each terminal device.

[0072] S302, the processor counts that the number of terminal devices with the temperature adjustment requirement of strengthening the temperature adjustment is n; the number of terminal devices with the temperature adjustment requirement of weakening the temperature adjustment is m.

[0073] S303, the processor determines whether n - m > A is satisfied. Where A is the upper limit threshold of the quantity, and A ≥ 0.

[0074] If yes, the processor executes step S304 and step S305; if no, the processor executes step S306.

[0075] S304, the processor determines that the system temperature adjustment requirement is to strengthen the temperature adjustment.

[0076] S305, the processor reduces the set value of the total pipe temperature difference of the chilled water.

[0077] S306, the processor determines whether n - m < B is satisfied. Where B is the lower limit threshold of the quantity, and B ≤ 0.

[0078] If yes, the processor executes step S307 and step S308; if no, the processor executes step S309.

[0079] S307, the processor determines that the system temperature adjustment requirement is to weaken the temperature adjustment.

[0080] S308, the processor increases the set value of the total pipe temperature difference of the chilled water.

[0081] S309, the processor determines that the set value of the total pipe temperature difference of the chilled water remains unchanged.

[0082] Using the control method for central air conditioning provided in this disclosure, in the case of multiple terminal devices, the temperature regulation requirements of each terminal device are obtained, and the number of terminal devices with temperature regulation requirements of strengthening temperature regulation and weakening temperature regulation are counted separately. If the number of terminal devices with temperature regulation requirements of strengthening temperature regulation is higher than the sum of the number of terminal devices with temperature regulation requirements of weakening temperature regulation and the upper limit threshold A, it indicates that more terminal devices need strengthening temperature regulation. In this case, the overall system temperature regulation requirement of the central air conditioning is determined to be strengthening temperature regulation, and the setpoint of the chilled water main pipe is reduced to promote cold energy exchange, which is beneficial to promoting temperature regulation and enabling more terminal devices to meet the temperature regulation requirements. If the number of terminal devices with temperature regulation requirements of strengthening temperature regulation is lower than the sum of the number of terminal devices with temperature regulation requirements of weakening temperature regulation and the lower limit threshold B, it indicates that more terminal devices need weakening temperature regulation. In this case, the overall system temperature regulation requirement of the central air conditioning is determined to be weakening temperature regulation, and the setpoint of the chilled water main pipe is increased to slow down the cold energy exchange, thereby weakening temperature regulation and enabling more terminal devices to meet the temperature regulation requirements.

[0083] If neither of these two scenarios applies, it means that the difference between the number of terminal devices requiring enhanced temperature control and the number requiring reduced temperature control is greater than or equal to the lower threshold and less than or equal to the upper threshold. In other words, the number of terminal devices requiring enhanced temperature control is similar to the number requiring reduced temperature control. In this case, no adjustment is needed, and the chilled water main temperature difference setpoint remains unchanged.

[0084] The chilled water main pipe temperature difference setting is the difference between the unit return water temperature and the unit outlet water temperature.

[0085] Optionally, the processor reduces the chilled water main temperature difference setpoint, including: reducing the unit return water temperature while maintaining the unit outlet water temperature unchanged. With a lower return water temperature, the chilled water reaches the unit return water temperature more quickly, increasing the chilled water circulation speed and promoting cooling transfer. At this time, the chiller unit's load increases.

[0086] Optionally, the processor reduces the chilled water main temperature difference setpoint, including: when the chiller unit's full-load cooling capacity meets the terminal demand, the processor reduces the unit's return water temperature while maintaining the unit's outlet water temperature unchanged. When the chiller unit's full-load cooling capacity cannot meet the terminal demand, the processor reduces the unit's return water temperature while increasing the unit's outlet water temperature.

[0087] Optionally, whether the full-load cooling capacity of the chiller meets the terminal demand can be judged according to the change of the indoor temperature during the actual operation. If after the set operation duration, the ambient temperature of the space where the terminal equipment is located neither reaches the set temperature nor shows a trend of approaching the set temperature continuously, it is considered that the full-load cooling capacity of the chiller cannot meet the terminal demand.

[0088] Optionally, the processor increases the set value of the total pipe temperature difference of the chilled water, including: the processor increases the return water temperature of the unit and keeps the outlet water temperature of the unit unchanged.

[0089] Optionally, the processor decreases the set value of the total pipe temperature difference of the chilled water, including: the processor determines the reduction amount of the total pipe temperature difference set value according to the difference between n and m, and adjusts the total pipe temperature difference set value according to this reduction amount to make the total pipe temperature difference set value decrease. In this way, according to the number of terminal devices with various temperature regulation requirements, the adjustment range of the total pipe temperature set value is adjusted, so as to make a further refined control of the regulation process under the same system temperature regulation requirements.

[0090] Optionally, the processor determines the reduction amount of the total pipe temperature difference set value according to the difference between n and m, including: when A1 < n - m ≤ A2, the processor determines the reduction amount of the total pipe temperature difference set value as the first set value k1. When n - m > A2, the reduction amount of the total pipe temperature difference is determined as the second set value k2. Where A1 is the first upper limit value, A2 is the second upper limit value, and A1 < A2; k1 < k2. Under the same system temperature regulation requirements, the number of terminal devices with different temperature regulation requirements will affect the magnitude of the system temperature regulation requirements. The more terminal devices with the temperature regulation requirement of strengthening temperature regulation, the greater the demand for the central air conditioner to strengthen temperature regulation. Specifically, the greater the difference between n and m, the more terminal devices with the temperature regulation requirement of strengthening temperature regulation, and at this time, determining a larger reduction amount of the total pipe temperature difference can more accurately meet the temperature regulation requirements.

[0091] Optionally, after the processor determines that the system temperature regulation demand is to weaken the temperature regulation, it further includes: the processor controls the chilled water pump to increase the frequency, thereby increasing the water flow rate. In this way, it is beneficial to promote the heat exchange process and thus promote the temperature regulation.

[0092] Optionally, the processor increases the set value of the total pipe temperature difference of the chilled water, including: the processor determines the increase amount of the total pipe temperature difference set value according to the difference between n and m, and adjusts the total pipe temperature difference set value according to this increase amount to make the total pipe temperature difference set value increase. In this way, the adjustment range of the total pipe temperature difference set value can be adjusted according to the number of terminal devices with different temperature regulation requirements, so as to make it more in line with the actual temperature regulation requirements.

[0093] Optionally, the processor determines the increase in the total pipe temperature difference set value according to the difference between n and m, including: when B2 ≤ n - m < B1, the processor determines that the increase in the total pipe temperature difference set value is the third set value t1. When n - m < B2, the processor determines that the increase in the total pipe temperature difference set value is the fourth set value t2. Where B1 is the first lower limit value, B2 is the second lower limit value, and B2 < B1; t1 < t2. That is, when the system temperature regulation demand is to weaken the temperature regulation demand, the more the number of terminal devices with the temperature regulation demand to weaken the temperature regulation demand, the greater the system temperature regulation demand of the central air conditioner. At this time, the adjustment range of the total pipe temperature difference set value is larger to meet the temperature regulation demands of more terminal devices.

[0094] Optionally, after the processor determines that the system temperature regulation demand is to enhance the temperature, it further includes: the processor controls the chilled water pump to reduce the frequency, thereby reducing the water flow rate. In this way, it is beneficial to slow down the heat exchange process, thereby weakening the temperature regulation.

[0095] Optionally, the temperature regulation demand of each terminal device is updated at regular time intervals. In some embodiments, it can be understood as real-time update. Since the ambient temperature fluctuates continuously and the central air conditioner is always running, the temperature regulation demand of the terminal device will change. It needs to be updated continuously to ensure the accuracy of the judgment. During the process of adjusting the total pipe temperature difference set value of the chilled water, updating the temperature regulation demand of the terminal device can also determine the timing to exit the adjustment of the total pipe temperature difference set value of the chilled water.

[0096] Combined with Figure 4 As shown, the embodiments of the present disclosure provide a control method for a central air conditioner, including: [[ID=1�]]

[0097] S401, the processor obtains the temperature regulation demand of each terminal device.

[0098] S402, corresponding to each temperature regulation demand, the processor counts the number of terminal devices with this temperature regulation demand.

[0099] S403, the processor determines the system temperature regulation demand of the central air conditioner according to the number corresponding to each temperature regulation demand.

[0100] S404, the processor adjusts the total pipe temperature difference set value of the chilled water according to the system temperature regulation demand.

[0101] S405, the processor adjusts the water outlet temperature of the unit according to the system temperature regulation demand.

[0102] Optionally, the processor adjusts the unit's outlet water temperature according to the system's temperature regulation requirements, including: in cooling mode, if the system's temperature regulation requirement is to enhance temperature regulation, the processor decreases the unit's outlet water temperature; if the system's temperature regulation requirement is to weaken temperature regulation, the processor increases the unit's outlet water temperature.

[0103] The decrease or increase in the unit's outlet water temperature can be determined based on the number of terminal devices corresponding to different temperature regulation requirements.

[0104] Specifically, the decrease or increase in the unit's outlet water temperature is determined based on the number of terminal devices n for enhanced temperature regulation and the number of terminal devices m for reduced temperature regulation.

[0105] More specifically, the processor calculates the difference between the quantity n and the quantity m, and determines the decrease or increase in the unit's outlet water temperature based on this difference. When the system temperature regulation requirement is to strengthen temperature control, the larger the difference between n and m, the greater the decrease in the unit's outlet water temperature, and the lower the unit's outlet water temperature. Conversely, when the system temperature regulation requirement is to weaken temperature control, the smaller the difference between n and m, the greater the increase in the unit's outlet water temperature, and the higher the unit's outlet water temperature.

[0106] Optionally, in cooling mode, if the system temperature regulation requirement is to enhance temperature control, the processor first reduces the main pipe temperature difference setpoint, and then lowers the unit's outlet water temperature. Since lowering the unit's outlet water temperature reduces the energy efficiency ratio of the cooling process, reducing the main pipe temperature difference setpoint first, and then lowering the unit's outlet water temperature, can shorten the time it takes for the outlet water temperature to decrease, thereby reducing the negative impact on the energy efficiency ratio of the cooling process. During application, the interval between the two operations can be set according to actual needs.

[0107] Optionally, the processor first lowers the main pipe temperature difference setpoint, and then lowers the unit outlet water temperature. This includes: the processor first lowers the main pipe temperature difference setpoint, and after a first time interval, if the system temperature regulation requirement is still to strengthen temperature regulation, then lowers the unit outlet water temperature. This added judgment process helps avoid unnecessary drops in the unit outlet water temperature, thereby further reducing the negative impact on the energy efficiency ratio.

[0108] Optionally, the first time interval can be set to 15 to 30 minutes. This avoids the situation where the first time interval is too small, resulting in a small impact of the main pipe temperature difference setpoint on the ambient temperature, which could lead to an earlier drop in the unit's outlet water temperature. Conversely, it avoids the situation where the first time interval is too large, which could result in the system's temperature regulation requirements not being met for an extended period.

[0109] Optionally, in the refrigeration mode, if the system temperature regulation requirement is to weaken the temperature regulation, the processor first increases the water outlet temperature of the unit and then increases the set value of the total pipe temperature difference of the chilled water. During the refrigeration process, increasing the water outlet temperature of the unit is beneficial to improving the energy efficiency ratio. Therefore, first increasing the water outlet temperature of the unit is beneficial to extending the duration of the situation where the water outlet temperature of the unit is relatively high, thus being beneficial to improving the energy efficiency ratio.

[0110] Optionally, the processor first increases the water outlet temperature of the unit and then increases the set value of the total pipe temperature difference of the chilled water, including: the processor first increases the water outlet temperature of the unit, and after a second time interval, if the system temperature regulation requirement is still to weaken the temperature regulation, then increases the set value of the total pipe temperature difference of the chilled water. In this way, unnecessary adjustment of the set value of the total pipe temperature difference of the chilled water can be avoided, which is beneficial to simplifying the control logic.

[0111] Optionally, the value of the second time interval is from 15 minutes to 30 minutes.

[0112] Here, by way of example, the process of adjusting according to the system temperature regulation requirement is further described.

[0113] Suppose when the water outlet temperature of the unit is 8°C and the frequency of the chilled water pump is 40 Hz, the set value of the chilled water temperature difference is 5°C, and at this time, the cooling capacity is balanced. Determine the temperature regulation requirement of each terminal according to the ambient temperature in the space where the terminal equipment is located and the set temperature of the terminal equipment, and count that the number of terminal equipment with the temperature regulation requirement of strengthening the temperature regulation is n, and the number of terminal equipment with the temperature regulation requirement of weakening the temperature regulation is m. Set the upper limit threshold A of the quantity to be 2, and the lower limit threshold B of the quantity to be -2.

[0114] If 2 < n - m ≤ 5, the processor determines that the system temperature regulation requirement is to strengthen the temperature regulation, sets the set value of the total pipe temperature difference of the chilled water to 4°C, and increases the frequency of the chilled water pump to increase the water flow rate.

[0115] If 5 < n - m ≤ 8, the processor determines that the system temperature regulation requirement is to strengthen the temperature regulation, sets the set value of the total pipe temperature difference of the chilled water to 3°C, and increases the frequency of the chilled water pump to increase the water flow rate.

[0116] If n - m > 8, the processor determines that the system temperature regulation requirement is to strengthen the temperature regulation, sets the set value of the total pipe temperature difference of the chilled water to 3°C, and sets the water outlet temperature of the unit to 7.5°C, and increases the frequency of the chilled water pump to increase the water flow rate.

[0117] If -5 ≤ n - m < -2, the processor determines that the system temperature regulation requirement is to weaken the temperature regulation, sets the water outlet temperature of the unit to 8.5°C, sets the set value of the total pipe temperature difference of the chilled water to 6°C, and reduces the frequency of the chilled water pump to reduce the water flow rate. Among them, the water outlet temperature of the unit can be increased first, and then the set value of the total pipe temperature difference of the chilled water can be set.

[0118] If -8 ≤ nm < -5, the processor determines that the system temperature regulation requirement is to reduce temperature regulation, sets the unit outlet water temperature to 9℃, sets the chilled water main pipe temperature difference setpoint to 7℃, and reduces the chilled water pump frequency to reduce water flow. Alternatively, the unit outlet water temperature can be increased first, and then the chilled water main pipe temperature difference setpoint can be adjusted.

[0119] If nm < -8, the processor determines that the system temperature regulation requirement is to reduce temperature regulation, sets the unit outlet water temperature to 9.5℃, sets the chilled water main pipe temperature difference setpoint to 7.5℃, and reduces the chilled water pump frequency to reduce water flow. Alternatively, the unit outlet water temperature can be increased first, and then the chilled water main pipe temperature difference setpoint can be adjusted.

[0120] During the adjustment of the main pipe temperature difference setpoint, the actual temperature difference between the unit's outlet water temperature and return water temperature can be detected to perform PID (proportion-integral-derivative) calculations for correction.

[0121] Combination Figure 5 As shown, this disclosure provides a control device 300 for a central air conditioning system, including a processor 50 and a memory 51. Optionally, the device may further include a communication interface 52 and a bus 53. The processor 50, communication interface 52, and memory 51 can communicate with each other via the bus 53. The communication interface 52 can be used for information transmission. The processor 50 can call logical instructions in the memory 51 to execute the control method for the central air conditioning system described in the above embodiment.

[0122] Furthermore, the logic instructions in the aforementioned memory 51 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0123] The memory 51, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 50 executes functional applications and data processing by running the program instructions / modules stored in the memory 51, thereby implementing the control method for central air conditioning in the above embodiments.

[0124] The memory 51 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 51 may include high-speed random access memory and may also include non-volatile memory.

[0125] Combination Figure 6 As shown, this disclosure provides a central air conditioning unit 100, including a central air conditioning unit body and the aforementioned control device 200 for the central air conditioning unit. The control device 200 for the central air conditioning unit is installed on the unit body. The installation relationship described herein is not limited to placement inside the product, but also includes installation connections with other components of the product, including but not limited to physical connections, electrical connections, or signal transmission connections. Those skilled in the art will understand that the control device 200 for the central air conditioning unit can be adapted to suitable product bodies to achieve other feasible embodiments.

[0126] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the above-described control method for a central air conditioning system.

[0127] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0128] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0129] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0130] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0131] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0132] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A control method for a central air conditioner including a plurality of end devices, characterized by, The method comprises: obtaining temperature regulation requirements of each terminal device; counting the number of terminal devices with each temperature regulation requirement; determining the system temperature regulation requirement of the central air conditioner according to the number corresponding to each temperature regulation requirement; if n-m>A, determining that the system temperature regulation requirement is enhanced temperature regulation; if n-m<B, determining that the system temperature regulation requirement is weakened temperature regulation; wherein n is the number of terminal devices with enhanced temperature regulation requirement, m is the number of terminal devices with weakened temperature regulation requirement, A is an upper limit threshold of the number, B is a lower limit threshold of the number, and B≤0≤A; adjusting the chilled water main pipe temperature difference set value according to the system temperature regulation requirement; the chilled water main pipe temperature difference set value is the difference between the unit return water temperature and the unit outlet water temperature; if the system temperature regulation requirement is enhanced temperature regulation, reducing the chilled water main pipe temperature difference set value; if the system temperature regulation requirement is weakened temperature regulation, increasing the chilled water main pipe temperature difference set value.

2. The control method according to claim 1, characterized by, Obtaining the temperature regulation requirement of each terminal device comprises: obtaining the ambient temperature in the space where each terminal device is located; determining the temperature regulation requirement of the terminal device according to the set temperature of the terminal device and the ambient temperature corresponding to the terminal device.

3. The control method according to claim 2, characterized by, Determining the temperature regulation requirement of the terminal device according to the set temperature of the terminal device and the ambient temperature corresponding to the terminal device comprises: calculating the temperature difference between the ambient temperature in the space where the terminal device is located and the set temperature; if the temperature difference is greater than a first temperature threshold in a refrigeration working condition, determining that the temperature regulation requirement of the terminal device is enhanced temperature regulation; if the temperature difference is less than a second temperature threshold, determining that the temperature regulation requirement of the terminal device is weakened temperature regulation; wherein the first temperature threshold is greater than or equal to 0; and the second temperature threshold is less than or equal to 0.

4. The control method according to any one of claims 1 to 3, characterized by, After determining the system temperature regulation requirement of the central air conditioner according to the number corresponding to each temperature regulation requirement, the method further comprises: adjusting the unit outlet water temperature according to the system temperature regulation requirement.

5. The control method according to claim 4, characterized by, Adjusting the unit outlet water temperature according to the system temperature regulation requirement comprises: if the system temperature regulation requirement is enhanced temperature regulation in a refrigeration working condition, reducing the unit outlet water temperature; if the system temperature regulation requirement is weakened temperature regulation, increasing the unit outlet water temperature.

6. A control device for a central air conditioner, comprising a processor and a memory having stored program instructions, characterized in that, The processor is configured to execute the control method for the central air conditioner as claimed in any one of claims 1 to 5 when the program instructions are run.

7. A central air conditioning system comprising a plurality of end devices, characterized by, comprise: a central air conditioner body; the control device for the central air conditioner as claimed in claim 6 is installed in the central air conditioner body.

8. A storage medium storing program instructions, characterized in that, The program instructions execute the control method for the central air conditioner as claimed in any one of claims 1 to 5 when run.

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