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

Abstract

The invention relates to the technical field of intelligent household appliances, and discloses a control method for a central air conditioner, the central air conditioner comprises a plurality of tail end devices, and the method comprises the steps that the temperature adjusting requirement of each tail end device is obtained; corresponding to each temperature regulation demand, counting the number of the end equipment with the temperature regulation demand; according to the number corresponding to each temperature adjusting requirement, the system temperature adjusting requirement of the central air conditioner is determined; and adjusting a header pipe temperature difference set value of chilled water according to system temperature adjusting requirements. And counting the number of end equipment corresponding to different temperature adjusting requirements, and determining the system temperature adjusting requirement of the central air conditioner according to the number so as to adjust the main pipe temperature difference set value of the chilled water. The system temperature adjusting requirement of the central air conditioner can more accurately reflect the temperature adjusting requirements of more end equipment, and therefore the accuracy of operation adjusting of the central air conditioner is improved. The invention further discloses a control device for the central air conditioner, the central air conditioner and a storage medium.

Description

Technical Field

[0001] The present application relates to the technical field of central air conditioners, for example, to a control method, a control device, a central air conditioner and a storage medium for a central air conditioner. Background Art

[0002] In traditional central air conditioners, the unit performs cooling and heating operations according to the set water temperature, without judging the load at the indoor terminal. Users can change the set water outlet temperature of the unit according to the indoor temperature to meet actual needs. However, this relies on manual control by the user, which is complicated to operate and can easily lead to overcooling or overheating in the room, causing discomfort to the user.

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

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] Using the average temperature difference of the terminal equipment as the basis for judging the adjustment demand, individual extreme cases will affect the average value to a large extent, resulting in inaccurate judgment of the adjustment demand, causing the space where most terminal equipment is located to be overcooled or overheated, affecting user comfort.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The embodiments of the present disclosure provide a control method, a control device, a central air conditioner and a storage medium for a central air conditioner, so as to improve the accuracy of adjusting the central air conditioner and better meet the actual needs of users.

[0009] In some embodiments, the central air conditioner includes a plurality of 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; wherein, 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; wherein, 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; wherein, 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 total pipe temperature of the chilled water includes: determining the reduction amount of the total pipe temperature difference set value according to the difference between n and m; adjusting the total pipe temperature difference set value according to the reduction amount so that the total pipe temperature difference set value is reduced.

[0016] Optionally, determining the reduction amount of the total 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 total pipe temperature difference set value as the first set value k1; when n - m > A2, determining the reduction amount of the total 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 total pipe temperature difference of the chilled water includes: determining the increase amount of the total pipe temperature difference set value according to the difference between n and m; adjusting the total pipe temperature difference set value according to the increase amount so that the total pipe temperature difference set value is increased.

[0018] Optionally, determining the increase amount of the total 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 total pipe temperature difference set value as t1; when n - m < B2, determining the increase amount of the total 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 conditioner includes multiple terminal devices, the temperature adjustment requirements of each terminal device are obtained, the number of terminal devices corresponding to different temperature adjustment requirements is counted, and the system temperature adjustment requirements of the central air conditioner are determined according to the number of terminal devices corresponding to each temperature adjustment requirement, so as to adjust the main pipe temperature difference set value of the chilled water. In this way, the system temperature adjustment requirements of the central air conditioner can more accurately reflect the temperature adjustment requirements of more terminal devices, which is conducive to improving the accuracy of the central air conditioner operation adjustment.

[0025] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0027] Figure 1 is a schematic diagram of a control method for a central air conditioner provided by an embodiment of the present disclosure;

[0028] Figure 2 is a schematic diagram of another control method for a central air conditioner provided by an embodiment of the present disclosure;

[0029] Figure 3 is a schematic diagram of another control method for a central air conditioner provided by an embodiment of the present disclosure;

[0030] Figure 4 is a schematic diagram of another control method for a central air conditioner provided by an embodiment of the present disclosure;

[0031] Figure 5 is a schematic diagram of a control device for a central air conditioner provided by an embodiment of the present disclosure;

[0032] Figure 6 It is a schematic diagram of a central air conditioner provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0033] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0034] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

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

[0036] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0037] The term "and / or" is a description of the association relationship 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" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0039] The central air conditioner includes a chiller, a refrigerated water circulation system, a cooling water circulation system and a plurality of terminal devices, wherein the plurality of terminal devices are arranged in a plurality of spaces and are configured to adjust the temperature in the spaces where they are located.

[0040] In traditional central air conditioners, the chiller performs cooling and heating operations according to the set water temperature, and does not automatically judge the load of the indoor terminal equipment. Users can change the set water outlet temperature of the unit according to the indoor temperature to meet actual needs. However, this relies on manual control by the user and is complicated to operate. At the same time, due to inaccurate judgment by the user, it is easy to cause overcooling or overheating in the room, causing discomfort to the user.

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

[0042] It can be seen that the above control method can adjust the operation of the central air conditioner according to actual needs. However, if the average temperature difference is used as the basis for judging the adjustment demand, if there are individual extreme cases, such as a large temperature difference between one or two rooms, it will have a greater impact on the average temperature difference, resulting in inaccurate judgment of the adjustment demand, causing the space where the terminal equipment is located to be overcooled or overheated, affecting the user's comfort.

[0043] In order to improve the accuracy of central air conditioning adjustment and better meet the actual needs of users, combined with Figure 1 As shown, the embodiment of the present disclosure provides a control method for a central air conditioner, comprising:

[0044] S101: The processor obtains the temperature adjustment requirements of each terminal device.

[0045] S102, corresponding to each temperature adjustment requirement, the processor counts the number of terminal devices having the temperature adjustment requirement.

[0046] S103: The processor determines the system temperature adjustment demand of the central air conditioner according to the quantity corresponding to each temperature adjustment demand.

[0047] S104: The processor adjusts a main pipe temperature difference setting value of the chilled water according to a system temperature adjustment requirement.

[0048] By adopting the control method for central air conditioners provided by the embodiment of the present disclosure, when the central air conditioner includes multiple terminal devices, the temperature adjustment requirements of each terminal device are obtained, the number of terminal devices corresponding to different temperature adjustment requirements is counted, and the system temperature adjustment requirements of the central air conditioner are determined according to the number of terminal devices corresponding to each temperature adjustment requirement, so as to adjust the main pipe temperature difference setting value of the chilled water. In this way, the system temperature adjustment requirements of the central air conditioner can more accurately reflect the temperature adjustment requirements of more terminal devices, thereby facilitating the improvement of the accuracy of the operation adjustment of the central air conditioner.

[0049] In addition, the related technology directly reduces the unit outlet water temperature when judging that the current operation status cannot meet the cooling demand. Although it can better meet the cooling demand, the cooling energy efficiency ratio is reduced. In this solution, the adjustment of the cooling capacity transport rate is achieved by adjusting the main pipe temperature difference setting value of the chilled water. At this time, the unit outlet water temperature does not change, and the energy efficiency ratio will not be reduced. While ensuring that the operation of the central air conditioner is consistent with the actual operation requirements, the energy efficiency ratio of the central air conditioner operation is taken into account.

[0050] Optionally, the temperature adjustment requirement includes: strengthening temperature adjustment and weakening temperature adjustment. Strengthening temperature adjustment means that the current operation of the central air conditioner cannot meet the temperature adjustment requirement and needs to be further strengthened. Weakening temperature adjustment means that the current operation of the central air conditioner has fully met or even exceeded the temperature adjustment requirement and needs to reduce the operation intensity.

[0051] In other embodiments, the temperature adjustment requirement may also include maintaining temperature adjustment, that is, the current operating conditions just meet the operating requirements and no further adjustment is required.

[0052] Combination Figure 2As shown, the embodiment of the present disclosure provides another control method for a central air conditioner, comprising:

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

[0054] A sensing device is arranged in the space where the terminal device is located and is in communication connection with the terminal device. The sensing device is configured to detect the ambient temperature in the space where the terminal device is located.

[0055] S202: The processor determines the temperature adjustment requirement of the terminal device according to the set temperature of the terminal device and the ambient temperature corresponding to the terminal device.

[0056] S203, corresponding to each temperature adjustment requirement, the processor counts the number of terminal devices having the temperature adjustment requirement.

[0057] S204: The processor determines the system temperature adjustment demand of the central air conditioner according to the quantity corresponding to each temperature adjustment demand.

[0058] S205: The processor adjusts the main pipe temperature difference setting value of the chilled water according to the system temperature adjustment requirement.

[0059] After adjusting the main pipe temperature difference set value of the chilled water, the corresponding relationship between the adjusted main pipe temperature difference set value and the ambient temperature and set temperature of the terminal equipment can be recorded as historical data, which can be matched and called in subsequent operations. The historical data can be analyzed by algorithms to further optimize the main pipe temperature difference set value.

[0060] Optionally, the processor determines the temperature adjustment requirement of the terminal device according to the set temperature of the terminal device and the ambient temperature corresponding to the terminal device, including: the processor calculates the temperature difference between the ambient temperature and the set temperature in the space where the terminal device is located. Under the refrigeration condition, if the temperature difference is greater than the first temperature threshold, the processor determines that the temperature adjustment requirement of the terminal device is to strengthen the temperature adjustment. If the temperature difference is less than the second temperature threshold, the temperature adjustment requirement of the terminal device is determined to weaken the temperature adjustment. The first temperature threshold is greater than or equal to 0; the second temperature threshold is less than or equal to 0.

[0061] In the disclosed embodiment, 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] Under the refrigeration condition, 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 the refrigeration needs to be strengthened. Therefore, the temperature adjustment requirement is to strengthen the temperature adjustment; 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, the refrigeration needs to be weakened. Therefore, the temperature adjustment requirement is to weaken the temperature adjustment.

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

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

[0065] In other embodiments, the temperature adjustment requirement may also include maintaining temperature adjustment. That is, the current operation can meet the operation requirement and no further adjustment is required. In the case of cooling, if the temperature difference is less than or equal to the first temperature threshold and greater than or equal to the second temperature threshold, the processor determines that the temperature adjustment requirement of the terminal device is maintaining temperature adjustment. At this time, the ambient temperature is relatively close to the set temperature, and it is determined that the operation of the central air conditioner meets the current temperature adjustment requirement.

[0066] Optionally, the processor determines 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, including: the processor calculates the temperature difference between the ambient temperature in the space where the terminal device is located and the set temperature. Under the heating condition, if the temperature difference is greater than the third temperature threshold, the processor determines that the temperature regulation requirement of the terminal device is a weakened temperature regulation requirement. If the temperature difference is less than the 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] Under the heating condition, 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, compared with the set temperature, the ambient temperature is too high, and the heating process needs to be weakened to better approach the set temperature. Therefore, the temperature adjustment requirement is determined to be a weakened temperature adjustment requirement; 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, compared with the set temperature, the ambient temperature is too low. At this time, the heating process needs to be strengthened to approach the set temperature. Therefore, the temperature adjustment requirement is determined to be a strengthened temperature adjustment.

[0068] Optionally, the third temperature threshold value is 1°C to 3°C, for example, 2°C.

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

[0070] Combined Figure 3 As shown, the embodiments of the present disclosure provide 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 temperature adjustment is n; the number of terminal devices with the temperature adjustment requirement of weakening temperature adjustment is m.

[0073] S303, the processor determines whether n - m > A is satisfied. Wherein, 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 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. Wherein, 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 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] By adopting the control method for central air conditioning provided by the embodiment of the present disclosure, in the case of multiple terminal devices, the temperature regulation demand of each terminal device is obtained, and the number of terminal devices with temperature regulation demand of strengthening temperature regulation and weakening temperature regulation is counted respectively. If the number of terminal devices with temperature regulation demand of strengthening temperature regulation is higher than the sum of the number of terminal devices with temperature regulation demand of weakening temperature regulation and the number upper limit threshold value A, it means that there are more terminal devices that need to strengthen temperature regulation. At this time, it is determined that the system temperature regulation demand of the central air conditioner as a whole is strengthened temperature regulation, and the temperature difference setting value of the main pipe of the chilled water is reduced to promote the exchange of cold, which is conducive to promoting temperature regulation, so that the operation of more terminal devices meets the temperature regulation demand. If the number of terminal devices with temperature regulation demand of strengthening temperature regulation is lower than the sum of the number of terminal devices with temperature regulation demand of weakening temperature regulation and the number lower limit threshold value B, it means that there are more terminal devices that need to weaken temperature regulation. At this time, it is determined that the system temperature regulation demand of the central air conditioner as a whole is weakened temperature regulation. At this time, the temperature difference setting value of the main pipe of the chilled water is increased to slow down the exchange of cold, thereby weakening temperature regulation, so that the operation of more terminal devices meets the temperature regulation demand.

[0083] If neither of the two situations applies, it means that the difference between the number of terminal devices that need to strengthen temperature regulation and the number of terminal devices that need to weaken temperature regulation is greater than or equal to the lower limit threshold, and less than or equal to the upper limit threshold. That is, the number of terminal devices that need to strengthen temperature regulation is similar to the number of terminal devices that need to weaken temperature regulation. At this time, no adjustment is required, and the main pipe temperature difference setting value of the chilled water remains unchanged.

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

[0085] Optionally, the processor reduces the temperature difference setting value of the main pipe of the chilled water, including: the processor reduces the return water temperature of the unit and keeps the outlet water temperature of the unit unchanged. The return water temperature of the unit is reduced, the temperature of the chilled water reaches the return water temperature of the unit more quickly, the circulation speed of the chilled water is accelerated, and the transfer of cooling capacity is promoted. At this time, the load of the chiller increases.

[0086] Optionally, the processor reduces the main pipe temperature difference setting value of the chilled water, including: when the full load cooling capacity of the chiller meets the terminal demand, the processor reduces the unit return water temperature and keeps the unit outlet water temperature unchanged. When the full load cooling capacity of the chiller cannot meet the terminal demand, the processor reduces the unit return water temperature and increases the unit 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 process. 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 tendency to approach 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 decrease amount of the set value of the total pipe temperature difference according to the difference between n and m, and adjusts the set value of the total pipe temperature difference according to this decrease amount, so that the set value of the total pipe temperature difference decreases. In this way, according to the number of terminal devices with various temperature adjustment requirements, the adjustment range of the total pipe temperature set value is adjusted, so as to make a further refined control of the adjustment process under the same system temperature adjustment requirements.

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

[0091] Optionally, after the processor determines that the system temperature adjustment requirement is to weaken the temperature adjustment, 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 adjustment.

[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 set value of the total pipe temperature difference according to the difference between n and m, and adjusts the set value of the total pipe temperature difference according to this increase amount, so that the set value of the total pipe temperature difference increases. In this way, the adjustment range of the set value of the total pipe temperature difference can be adjusted according to the number of terminal devices with different temperature adjustment requirements, so as to make it more in line with the actual temperature adjustment 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 adjustment demand is to weaken the temperature adjustment demand, the more the number of terminal devices with the temperature adjustment demand to weaken the temperature adjustment demand, the greater the system temperature adjustment 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 adjustment requirements of more terminal devices.

[0094] Optionally, after the processor determines that the system temperature adjustment 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 adjustment.

[0095] Optionally, the temperature adjustment 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 adjustment 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 adjustment 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, an embodiment of the present disclosure provides a control method for a central air conditioner, including:

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

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

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

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

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

[0102] Optionally, the processor adjusts the unit outlet water temperature according to the system temperature regulation requirement, including: in the cooling condition, if the system temperature regulation requirement is to strengthen the temperature regulation, the processor reduces the unit outlet water temperature. If the system temperature regulation requirement is to weaken the temperature regulation, the processor increases the unit outlet water temperature.

[0103] Among them, the reduction value or increase value of the unit outlet water temperature can be determined according to the number of terminal devices corresponding to different temperature adjustment requirements.

[0104] Specifically, the decrease value or increase value of the unit outlet water temperature is determined according to the number n of terminal devices whose temperature regulation requirements are to strengthen temperature regulation and the number m of terminal devices whose temperature regulation requirements are to weaken temperature regulation.

[0105] More specifically, the processor calculates the difference between the number n and the number m, and determines the decrease or increase of the unit outlet water temperature according to the difference. When the system temperature regulation requirement is to strengthen the temperature regulation, the larger the difference obtained by subtracting m from n, the larger the decrease of the unit outlet water temperature, and the lower the unit outlet water temperature. When the system temperature regulation requirement is to weaken the temperature regulation, the smaller the difference obtained by subtracting m from n, the larger the increase of the unit outlet water temperature, and the higher the unit outlet water temperature.

[0106] Optionally, in the refrigeration condition, if the system temperature regulation requirement is to strengthen the temperature regulation, the processor first reduces the main pipe temperature difference setting value, and then reduces the unit outlet water temperature. Since lowering the unit outlet water temperature will reduce the energy efficiency ratio of the refrigeration process, first reducing the main pipe temperature difference setting value, and then lowering the unit outlet water temperature, can shorten the time for the unit outlet water temperature to decrease, thereby helping to reduce the negative impact on the energy efficiency ratio of the refrigeration process. During the application process, the interval between the two operations can be set according to actual needs.

[0107] Optionally, the processor first reduces the main pipe temperature difference setting value, and then reduces the unit outlet water temperature, including: the processor first reduces the main pipe temperature difference setting value, and after the first time interval, if the system temperature regulation demand is still to strengthen the temperature regulation, the unit outlet water temperature is reduced. In this way, after adding the judgment process, it is helpful to avoid the unnecessary decrease process of the unit outlet water temperature, thereby further reducing the negative impact on the energy efficiency ratio.

[0108] Optionally, the first time interval is set to 15 minutes to 30 minutes. In this way, it can avoid the first time interval being too small, resulting in a small impact of the main pipe temperature difference setting value adjustment on the ambient temperature, thereby further causing the unit outlet water temperature to decrease in advance. It can also avoid the first time interval being too large, resulting in a long period of time when the system temperature adjustment requirements cannot be met.

[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 prolonging 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 15 minutes to 30 minutes.

[0112] Here, by way of example, the process of adjustment 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 balance is achieved. 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 2, and the lower limit threshold B of the quantity to -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 weaken the temperature regulation, sets the unit outlet water temperature to 9°C, sets the main pipe temperature difference setting value of the chilled water to 7°C, and reduces the chilled water pump frequency to reduce the water flow. Among them, the unit outlet water temperature can be increased first, and then the main pipe temperature difference setting value of the chilled water can be set.

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

[0120] In the process of adjusting the main pipe temperature difference set value, the actual temperature difference between the unit outlet water temperature and the return water temperature can be detected to perform PID (proportion-integral-derivative) calculation to achieve correction.

[0121] Combination Figure 5 As shown, the embodiment of the present disclosure provides a control device 300 for a central air conditioner, including a processor 50 and a memory 51. Optionally, the device may also include a communication interface 52 and a bus 53. The processor 50, the communication interface 52, and the memory 51 may communicate with each other through the bus 53. The communication interface 52 may be used for information transmission. The processor 50 may call the logic instructions in the memory 51 to execute the control method for the central air conditioner of the above embodiment.

[0122] In addition, the logic instructions in the above-mentioned memory 51 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

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

[0124] The memory 51 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 51 may include a high-speed random access memory and may also include a non-volatile memory.

[0125] Combination Figure 6 As shown, the embodiment of the present disclosure provides a central air conditioner 100, including: a central air conditioner body, and the above-mentioned control device 200 for the central air conditioner. The control device 200 for the central air conditioner is installed in the product body. The installation relationship described here 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, etc. Those skilled in the art can understand that the control device 200 for the central air conditioner can be adapted to a feasible product body, thereby realizing other feasible embodiments.

[0126] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned control method for a central air conditioner.

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

[0128] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0129] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0130] Those skilled in the art will appreciate that the units and algorithm steps of each example 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 performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

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

[0132] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A control method for a central air conditioner, the central air conditioner comprising a plurality of terminal devices, characterized in that: 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 the temperature adjustment requirement; Determining the system temperature adjustment requirement of the central air conditioner according to the number corresponding to each temperature adjustment requirement; Adjusting the set value of the total pipe temperature difference of the chilled water according to the system temperature adjustment requirement.

2. The control method according to claim 1, characterized in that: Obtaining the temperature adjustment requirements of each terminal device includes: Obtaining the ambient temperature in the space where each terminal device is located; Determining the temperature adjustment 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 in that: Determining the temperature adjustment requirement of the terminal device according to the set temperature of the terminal device and the ambient temperature corresponding to the terminal device includes: Calculating the temperature difference between the ambient temperature and the set temperature in the space where the terminal device is located; Under the refrigeration condition, if the temperature difference is greater than the first temperature threshold, determining that the temperature adjustment requirement of the 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 the terminal device is to weaken the temperature adjustment; Wherein, the first temperature threshold is greater than or equal to 0; the second temperature threshold is less than or equal to 0.

4. The control method according to claim 1, characterized in that: 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; Wherein, 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.

5. The control method according to claim 1, characterized in that: 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.

6. The control method according to any one of claims 1 to 5, characterized in that: After determining the system temperature adjustment requirement of the central air conditioner according to the number corresponding to each temperature adjustment requirement, it further includes: Adjusting the water outlet temperature of the unit according to the system temperature adjustment requirement.

7. The control method according to claim 6, characterized in that: Adjusting the water outlet temperature of the unit according to the system temperature adjustment requirement includes: Under 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.

8. A control device for a central air conditioner, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the control method for the central air conditioner according to any one of claims 1 to 7 when running the program instructions.

9. A central air conditioner, comprising a plurality of terminal devices, characterized in that: It includes: The central air conditioner body; The control device for the central air conditioner according to claim 8, which is installed on the central air conditioner body.

10. A storage medium storing program instructions, characterized in that: When the program instructions are running, they execute the control method for the central air conditioner according to any one of claims 1 to 7.

Images