Energy-saving adjusting method and system for multi-split indoor unit fixed-frequency water pump based on energy demand

Abstract

The invention relates to the technical field of air conditioner adjustment, and provides a multi-split indoor unit fixed-frequency water pump energy-saving adjustment method and system based on energy demand, and the multi-split indoor unit fixed-frequency water pump energy-saving adjustment method comprises the steps that the operation power of an air conditioner is changed into first power corresponding to user demand within a first time interval, based on the change result of the indoor temperature in the first time interval, the indoor refrigerating volume is obtained, and the air conditioner indoor unit function demand is calculated according to the current indoor temperature, the user demand and the indoor refrigerating volume; the air conditioner indoor unit function needs to be subjected to first adjustment according to the indoor air humidity, the air conditioner indoor unit function needs to be subjected to second adjustment according to the indoor and outdoor temperature difference, the air conditioner indoor unit function needs to be subjected to third adjustment according to the air speed and direction adjustment parameters of the air conditioner, and the condensate water output of the air conditioner in unit time is obtained based on the air conditioner indoor unit function needs; and the starting time and the starting duration of the fixed-frequency water pump are adjusted according to the water pumping capacity of the fixed-frequency water pump and the condensate water output of the air conditioner in unit time.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning regulation, and particularly to a frequency-fixed water pump energy-saving regulation method and system for a multi-connected indoor unit based on energy demand. Background Art

[0002] With the increasingly widespread use demand of multi-connected air conditioners and the increasingly complex installation environment, how to smoothly discharge the condensate water generated in the air-conditioning refrigeration and dehumidification mode has long become an issue that cannot be ignored in the development process of multi-connected air conditioners. In response to how to avoid the accumulation of air-conditioning condensate water and thus damage the main board or affect the user experience, major air-conditioning manufacturers have taken targeted countermeasures in terms of air-conditioning structure design and software control. Among them, the most widely used and effective method is to install a drainage pump to timely extract the condensate water.

[0003] There are two types of commonly used drainage pumps in existing multi-connected air-conditioning systems, namely variable-frequency water pumps and fixed-frequency water pumps. Among them, variable-frequency water pumps can control the running frequency of the water pump through software, and can control the corresponding rotation speed of the water pump for different operating conditions, taking into account the energy-saving requirements of the system while ensuring the smooth discharge of air-conditioning condensate water. The disadvantage is that the cost is relatively high. The cost of fixed-frequency water pumps is relatively lower than that of variable-frequency water pumps and is widely used in the air-conditioning products of some air-conditioning manufacturers. Using a fixed-frequency water pump requires accurate calculation of the energy demand of the air conditioner to accurately and timely extract the condensate water. Currently, existing air conditioners do not comprehensively consider multiple factors such as environmental humidity, temperature, air-conditioning running duration and frequency, resulting in a serious disconnection between energy demand calculation and actual demand. For example, in a high-humidity environment, condensate water is generated quickly, and the energy demand calculated according to the fixed running time cannot meet the timely drainage demand; while in a low-humidity environment, condensate water is generated slowly, and resource waste will be caused due to over-estimation of energy demand. Summary of the Invention

[0004] Aiming at the above defects, the purpose of the present invention is to provide a frequency-fixed water pump energy-saving regulation method and system for a multi-connected indoor unit based on energy demand, aiming to calculate the energy demand of the indoor unit of the air conditioner by considering user needs and changes in the indoor environment, and then accurately determine the starting time and duration of the fixed-frequency water pump according to the energy demand and the water pumping capacity of the fixed-frequency water pump, so as to smoothly discharge the condensate water and achieve the energy-saving effect at the same time.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A frequency-fixed water pump energy-saving regulation method for a multi-connected indoor unit based on energy demand, the frequency-fixed water pump energy-saving regulation method for the multi-connected indoor unit includes:

[0007] Obtain user needs, change the operating power of the air conditioner to a first power corresponding to the user needs within a first time interval, obtain the refrigerable volume indoors based on the change result of the indoor temperature within the first time interval, and calculate the energy demand of the indoor unit of the air conditioner according to the current indoor temperature, user needs and the refrigerable volume indoors;

[0008] The first adjustment is made to the internal unit of the air conditioner according to the indoor air humidity, the second adjustment is made to the internal unit of the air conditioner according to the temperature difference between indoors and outdoors, and the third adjustment is made to the internal unit of the air conditioner according to the air volume and air direction adjustment parameters of the air conditioner. Based on the required energy of the internal unit of the air conditioner, the condensate output of the air conditioner per unit time is obtained;

[0009] According to the pumping capacity of the fixed-frequency water pump and the condensate output of the air conditioner per unit time, the starting time and duration of the fixed-frequency water pump are adjusted.

[0010] Preferably, obtaining the refrigerable volume indoors based on the change result of the indoor temperature within the first time interval includes:

[0011] Obtain the initial temperature value and the end temperature value within the first time interval;

[0012] Calculate the change rate of the indoor temperature according to the difference between the initial temperature value and the end temperature value and the ratio of the first time interval;

[0013] Judge whether the change rate of the indoor temperature within the first time interval exceeds the preset change rate threshold:

[0014] If the change rate of the indoor temperature exceeds the preset change rate threshold, perform a negative non-linear adjustment with the first reference coefficient as the base according to the ratio of the reference temperature change rate to the actual temperature change rate to generate a refrigerable volume correction coefficient;

[0015] If the change rate of the indoor temperature does not exceed the preset change rate threshold, perform a positive non-linear adjustment with the second reference coefficient as the base according to the ratio of the actual temperature change rate to the reference temperature change rate to generate a refrigerable volume correction coefficient;

[0016] Multiply the refrigerable volume correction coefficient by the standard room volume to obtain the actual value of the current refrigerable volume.

[0017] Preferably, calculating the required energy of the internal unit of the air conditioner according to the current indoor temperature, user requirements, and the refrigerable volume indoors includes:

[0018] Obtain the temperature difference value between the current indoor temperature and the user-set temperature;

[0019] Based on the absolute value of the temperature difference value and the refrigerable volume, calculate the initial required energy value of the internal unit of the air conditioner, where the initial required energy level is positively correlated with both the absolute value of the temperature difference value and the refrigerable volume;

[0020] Determine the air conditioner operation mode according to the positive and negative directions of the temperature difference value. When the temperature difference value is positive, perform proportional correction on the initial required energy value in the cooling mode;

[0021] Adjust the corrected energy demand value based on the refrigerable volume: when the refrigerable volume decreases, reduce the energy demand weight per unit volume; when the refrigerable volume increases, increase the energy demand weight per unit volume, and calculate the energy demand value of the indoor unit of the air conditioner according to the energy demand weight.

[0022] Preferably, the first adjustment of the energy demand of the indoor unit of the air conditioner according to the indoor air humidity includes:

[0023] Obtain the real-time humidity value of the indoor air and the humidity change trend within a continuous time window;

[0024] Compare the real-time humidity value with a preset reference humidity threshold, and judge the deviation direction of the humidity based on the humidity change trend;

[0025] When the real-time humidity value is higher than the reference humidity threshold and the humidity change trend is continuously rising, generate a positive dynamic correction coefficient to increase the energy demand value of the indoor unit of the air conditioner, where the positive dynamic correction coefficient increases with the increase in the amplitude of the humidity exceeding the reference humidity threshold and the rising rate of the humidity change trend;

[0026] When the real-time humidity value is lower than the reference humidity threshold and the humidity change trend is continuously falling, generate a negative dynamic correction coefficient to increase the energy demand value of the indoor unit of the air conditioner, where the negative dynamic correction coefficient decreases with the increase in the amplitude of the humidity below the reference humidity threshold and the falling rate of the humidity change trend.

[0027] Preferably, the second adjustment of the energy demand of the indoor unit of the air conditioner according to the indoor-outdoor temperature difference includes:

[0028] Obtain the user-set temperature, the current indoor temperature, and the outdoor real-time temperature, and calculate the absolute value of the indoor-outdoor temperature difference and the absolute value of the target temperature difference, where the absolute value of the target temperature difference is the difference between the current indoor temperature and the outdoor real-time temperature;

[0029] Judge whether the absolute value of the target temperature difference is in the interval that needs to be preferentially adjusted. When the absolute value of the target temperature difference is greater than the preset target temperature difference threshold, the absolute value of the target temperature difference is in the interval that needs to be preferentially adjusted, and judge whether the absolute value of the indoor-outdoor temperature difference exceeds the indoor heat conduction critical threshold;

[0030] When the absolute value of the target temperature difference is in the interval that needs to be preferentially adjusted and the absolute value of the indoor-outdoor temperature difference exceeds the heat conduction critical threshold, generate an energy demand increase instruction, where the energy demand increase amplitude is positively correlated with the product of the target temperature difference and the indoor-outdoor temperature difference;

[0031] When the absolute value of the target temperature difference is out of the interval that needs to be preferentially adjusted or the absolute value of the indoor-outdoor temperature difference is lower than the heat conduction critical threshold, generate an energy demand decrease instruction, where the energy demand decrease amplitude is negatively correlated with the ratio of the target temperature difference and the indoor-outdoor temperature difference;

[0032] The second adjustment is performed on the energy demand of the indoor unit of the air conditioner according to the energy demand instruction.

[0033] Preferably, the third adjustment of the energy demand of the indoor unit of the air conditioner according to the air volume and air direction adjustment parameters of the air conditioner includes:

[0034] Obtain the current indoor temperature distribution uniformity parameter, the real-time air volume gear, and the deviation degree of the air supply angle, where the deviation degree of the air supply angle is the absolute deviation angle value between the real-time air supply direction and the preset optimal refrigeration air supply direction, and the optimal refrigeration air supply direction is the direction with the highest regional temperature in the real-time indoor temperature distribution;

[0035] Judge whether the air volume gear meets the recommended air volume range matching the current refrigerable volume, and calculate whether the deviation degree of the air supply angle exceeds the cold quantity distribution failure threshold;

[0036] When the air volume gear is lower than the recommended air volume range and the indoor temperature distribution uniformity parameter exceeds the allowable fluctuation range, generate an energy demand increase coefficient based on the product of the air volume gear deviation degree and the temperature distribution fluctuation amplitude, and linearly enhance the energy demand value of the indoor unit of the air conditioner through the energy demand increase coefficient;

[0037] When the deviation degree of the air supply angle exceeds the cold quantity distribution failure threshold and the air volume gear is within the recommended air volume range, generate an energy demand attenuation coefficient based on the ratio of the absolute value of the deviation degree of the air supply angle to the refrigerable volume, and stepwise reduce the energy demand value of the indoor unit of the air conditioner through the energy demand attenuation coefficient.

[0038] Preferably, based on the energy demand of the indoor unit of the air conditioner, the condensate output of the air conditioner per unit time is obtained, and the relationship is satisfied:

[0039]

[0040] Where, Q c represents the condensate output of the air conditioner per unit time, Q b represents the condensate generation per unit time under the reference working condition, E adj represents the energy demand value after the first, second, and third adjustments, E base represents the initial energy demand reference value, γ represents the energy demand influence index, λ i represents the correction coefficient of air humidity, indoor and outdoor temperature difference, or air volume and air direction of the air conditioner, ΔP i represents the deviation degree between the actual measured value and the reference value of air humidity, indoor and outdoor temperature difference, or air volume and air direction of the air conditioner.

[0041] A multi-connected unit indoor unit fixed-frequency water pump energy-saving adjustment system based on energy demand, the multi-connected unit indoor unit fixed-frequency water pump energy-saving adjustment system is applied to the multi-connected unit indoor unit fixed-frequency water pump energy-saving adjustment method as described above, and the multi-connected unit indoor unit fixed-frequency water pump energy-saving adjustment system includes:

[0042] An energy demand calculation module, configured to obtain user demands, change the operating power of the air conditioner to a first power corresponding to the user demands within a first time interval, obtain the coolable volume in the room based on the change result of the indoor temperature within the first time interval, and calculate the indoor unit energy demand of the air conditioner according to the current indoor temperature, user demands, and the coolable volume in the room;

[0043] An energy demand adjustment module, configured to perform a first adjustment on the indoor unit energy demand of the air conditioner according to the indoor air humidity, perform a second adjustment on the indoor unit energy demand of the air conditioner according to the indoor-outdoor temperature difference, perform a third adjustment on the indoor unit energy demand of the air conditioner according to the air volume and direction adjustment parameters of the air conditioner, and obtain the condensate output of the air conditioner per unit time based on the indoor unit energy demand;

[0044] A pumping adjustment module, configured to adjust the starting time and duration of the constant-frequency water pump according to the pumping capacity of the constant-frequency water pump and the condensate output of the air conditioner per unit time.

[0045] One of the above technical solutions has the following advantages or beneficial effects:

[0046] By obtaining the personalized demands of users and adjusting the operating power of the corresponding indoor unit, the present invention calculates the coolable volume in combination with the change of indoor temperature, and then comprehensively calculates the initial energy demand considering multiple factors, providing accurate basic data for subsequent adjustment, ensuring that the energy demand calculation closely conforms to the actual working conditions in the room from the beginning, and avoiding the energy demand estimation deviation caused by ignoring some key factors in the traditional method; in the second step, on this basis, further considering dynamic factors such as the air humidity in each room, the indoor-outdoor temperature difference, and the air volume and direction, the energy demand is adjusted three times, so that the energy demand result can more accurately reflect the change of the actual condensate production, and the obtained condensate output data is reliable and real-time, solving the problems of inaccurate energy demand calculation and disconnection from actual demands in the prior art; in the third step, according to the condensate output and the fixed pumping capacity of the constant-frequency water pump, the starting time and duration of the water pump in each room are reasonably planned. On the premise of meeting the requirements of timely drainage, the running time and energy consumption of the water pump are minimized to achieve energy-saving control, and at the same time, problems such as equipment damage and poor user experience caused by untimely drainage or excessive drainage are avoided, which can effectively improve the condensate discharge performance and energy-saving effect of the multi-split air conditioner in different complex usage environments of multiple rooms. Description of the Drawings

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0048] Figure 1 is a flowchart of an energy-saving adjustment method for a fixed-frequency water pump in a multi-connected indoor unit based on energy demand provided by an embodiment of the present invention;

[0049] Figure 2 is a schematic structural diagram of an energy-saving adjustment system for a fixed-frequency water pump in a multi-connected indoor unit based on energy demand provided by an embodiment of the present invention. Detailed implementation manners

[0050] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0051] In the present invention, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the element.

[0052] An energy-saving adjustment method for a fixed-frequency water pump in a multi-connected indoor unit based on energy demand, as Figure 1 shown, in a preferred embodiment of the present invention, the energy-saving adjustment method for the fixed-frequency water pump in the multi-connected indoor unit includes the following steps:

[0053] S1: Obtain user requirements, change the operating power of the air conditioner to a first power corresponding to the user requirements within a first time interval, obtain the coolable volume indoors based on the change result of the indoor temperature within the first time interval, and calculate the energy demand of the indoor unit of the air conditioner according to the current indoor temperature, user requirements and the coolable volume indoors;

[0054] In a multi-split air conditioning system, different users have different comfort requirements for indoor temperature and humidity. Therefore, it is necessary to first obtain the specific needs of users, such as the set temperature, preference for cooling or dehumidification mode, etc. This is the basis for personalized adjustment. The multi-split air conditioning system usually serves multiple rooms, and the usage status and environmental conditions of each room are different. Therefore, it is necessary to adjust each indoor unit separately. Thus, the method proposed by the present invention is applicable to each indoor unit in the multi-split air conditioning system. Adjust the operating power of the air conditioner to the first power corresponding to the user's needs within the first time interval, aiming to make the air conditioner quickly operate with appropriate capacity and avoid over-cooling or insufficient cooling. The change result of the indoor temperature can reflect the actual cooling effect of the air conditioner at this power. By analyzing the temperature change, the refrigerable volume indoors can be calculated, that is, the space range that the air conditioner can effectively cool (for example, in a warehouse, when it is empty and then filled with goods, the effective cooling space range decreases). Combining the current indoor temperature, user needs, and refrigerable volume, the actual energy demand of the indoor unit of the air conditioner under the current operating state can be accurately calculated, providing key data support for subsequent energy-saving adjustment, ensuring that the energy demand calculation conforms to the actual situation, and thus reasonably controlling the operation of the drainage pump to avoid drainage problems caused by inaccurate energy demand estimation.

[0055] Among them, the user needs refer to the temperature value set by the user through the air conditioner control panel or remote control, mode selection (cooling, dehumidification, etc.), and wind speed preference, etc. It directly determines the operating target and basic operating state of the air conditioner and is the starting point and basis for the entire adjustment process. The first time interval is a preset time period used to stably operate and monitor the temperature change after adjusting the operating power. Its duration can be set according to factors such as the response characteristics of the multi-split air conditioning system and the thermal inertia of the room to ensure that representative temperature change data can be obtained. The operating power represents the energy consumption output of the core components of the air conditioner, such as the compressor and fan. Changing it to the first power corresponding to the user's needs can make the air conditioner operate with the most appropriate cooling capacity, avoiding energy waste or poor cooling effect. The change result of the indoor temperature is monitored in real time by temperature sensors installed in each room, and the temperature values are recorded before and after the first time interval and the difference is calculated to reflect the actual influence degree of the air conditioner on the indoor temperature at the current operating power. The refrigerable volume is estimated based on this temperature change result, combined with the space parameters of the room (such as area, floor height) and the air supply characteristics of the air conditioner, representing the space volume that the air conditioner can effectively cover and cool. These parameters work together to provide comprehensive inputs for accurately calculating the energy demand. The energy demand is the energy that the indoor unit of the air conditioner needs to consume to meet the user's needs in the current environment. Its calculation result will directly affect the subsequent adjustment strategy of the drainage pump to ensure that the drainage volume matches the condensate generation volume.

[0056] S2: Perform the first adjustment on the internal unit energy demand of the air conditioner according to the indoor air humidity, perform the second adjustment on the internal unit energy demand of the air conditioner according to the indoor-outdoor temperature difference, perform the third adjustment on the internal unit energy demand of the air conditioner according to the air speed and direction adjustment parameters of the air conditioner, and obtain the condensate output of the air conditioner per unit time based on the internal unit energy demand;

[0057] Specifically, in a multi-split air conditioning system, the environmental conditions of each room vary greatly. Factors such as air humidity, indoor-outdoor temperature difference, and air speed and direction of the air conditioner will significantly affect the refrigeration and dehumidification effect of the air conditioner and the generation amount of condensate. The higher the air humidity, the more water vapor content, and the greater the condensate generation amount under the same refrigeration conditions. Therefore, it is necessary to perform the first adjustment on the energy demand to adapt to different humidity environments. The indoor-outdoor temperature difference reflects the heat exchange situation between the room and the outside. The larger the temperature difference, the greater the refrigeration load of the air conditioner may be, and at the same time, it will also make the water vapor in the air easier to condense, increasing the condensate generation amount. Therefore, the second adjustment is required. The air speed and direction adjustment parameters of the air conditioner affect the circulation of indoor air and the heat exchange efficiency between the refrigerant and the air. Appropriate air speed and direction can improve the refrigeration efficiency and change the condensate generation rate. Therefore, the third adjustment is required. By performing these three adjustments on the energy demand, fully considering the complex environment and operating status of each room in the multi-split air conditioning system, the actual condensate generation amount can be determined more accurately, providing key data for subsequent reasonable control of the drainage pump, ensuring that the drainage system matches the condensate generation speed, and avoiding energy waste caused by condensate accumulation or excessive drainage.

[0058] Among them, the indoor air humidity refers to the content of water vapor in the air of the room, which can be expressed by relative humidity. It directly determines how much water vapor will condense into condensate during the air-conditioning refrigeration process and is one of the important factors affecting the amount of condensate generated. The indoor humidity value is monitored in real time through humidity sensors installed in each room and used as an important basis for adjusting the energy demand. The first adjustment is the initial adjustment of the energy demand for the air humidity. The adjustment range can be determined according to the relationship between the preset humidity and the energy demand adjustment coefficient. For example, when the humidity increases by 10%, the energy demand increases by a certain proportion to meet the condensate generation requirements in different humidity environments. The indoor-outdoor temperature difference is the difference between the indoor temperature and the outdoor temperature, reflecting the thermal balance state between the room and the outside world. The larger the temperature difference, the greater the cooling load of the air conditioner may be, and the more potential condensate may be generated. At the same time, it will also affect the operating efficiency of the air conditioner. The indoor and outdoor temperatures are monitored respectively through temperature sensors installed in the indoor unit and the outdoor unit, and the difference is calculated. Based on this, the second adjustment of the energy demand is carried out, and the adjustment method can be implemented according to the empirical formula or experimental data of the temperature difference and the energy demand change. The air volume and air direction adjustment parameters of the air conditioner include parameters such as the rotation speed setting of the indoor unit fan and the angle of the air deflector. These parameters affect the air flow state in the room and the heat exchange efficiency between the refrigerant and the air. For example, a higher air volume can make more air flow through the evaporator, promoting the condensation of water vapor, but it may also cause some condensate to be carried away by the air flow, affecting the actual collection amount. Different air directions may affect the air humidity distribution and cooling effect in different areas of the room. The current air volume and air direction parameters are obtained through the control program of the air conditioner, and based on this, the third adjustment of the energy demand is carried out, that is, the third adjustment. The adjustment relationship also needs to be established in advance. For example, a specific air volume corresponds to a certain proportion of increase or decrease in energy demand. Based on the energy demand results after these three adjustments and combined with the condensate generation mechanism, the condensate output of the air conditioner per unit time can be accurately calculated. This data is crucial for determining the operating frequency and duration of the drainage pump to ensure that the condensate in each room can be drained in a timely and effective manner, avoiding adverse effects on the operation of the multi-split system.

[0059] S3: Adjust the starting time and duration of the fixed-frequency water pump according to the pumping capacity of the fixed-frequency water pump and the condensate output of the air conditioner per unit time.

[0060] Specifically, the pumping capacity of a fixed-frequency water pump is fixed, that is, the volume or mass of condensed water that can be pumped and discharged per unit time of its operation in each cycle is constant. According to the condensed water output of each room's air conditioner per unit time obtained in the previous step, it is possible to determine at what time interval the water pump needs to be turned on and how long it needs to run each time to make the discharge speed of condensed water match the generation speed. In a multi-split air conditioning system, since the condensed water output of each room is different, it is necessary to independently control the drain pumps of each room or adopt a centralized drainage management strategy. Through precise calculation and reasonable control strategies, it is possible to minimize the number of times the water pump is turned on and its running time on the premise of meeting the drainage requirements of each room. Because the water pump consumes electrical energy during operation, and frequent start-stop may affect its service life. Therefore, reasonably adjusting the start-up time and duration helps to achieve energy-saving effects, while ensuring the reliable operation of the drainage system, ensuring that there is no accumulation of condensed water inside the air conditioners in each room of the multi-split air conditioning system, which may affect the normal operation of components such as the main board, and there will be no problem of condensed water overflow due to untimely drainage, thus improving the user experience.

[0061] Among them, the pumping capacity of a fixed-frequency water pump refers to the volume or mass of condensed water that the water pump can pump and discharge per unit time at a fixed operating frequency. This is an important performance parameter of the water pump, which is determined by factors such as the structural design of the water pump and the motor power. For example, the pumping capacity of a certain fixed-frequency water pump is to pump 100 milliliters of condensed water per minute. It is the key basis for determining the drainage cycle and the drainage duration each time. In a multi-split air conditioning system, each room may be equipped with an independent fixed-frequency water pump or share a water pump, which depends on the system design. The condensed water output of the air conditioner per unit time is an accurate data obtained after multi-factor adjustment, representing the amount of condensed water generated by each room's air conditioner per unit time under the current operating state and environmental conditions, and is used to compare with the pumping capacity to formulate a reasonable drainage plan. The start-up time refers to when to start the fixed-frequency water pump for drainage in the time series. Reasonably determining the start-up time can prevent excessive accumulation of condensed water in the room and avoid frequent start-stop of the water pump. In a multi-split air conditioning system, it may be necessary to coordinate the drainage times of each room to avoid drainage conflicts or system pressure changes caused by centralized drainage. The start-up duration is the length of time the water pump runs continuously after each start. It needs to be determined according to the estimated accumulated amount of condensed water in each room and the pumping capacity at present to ensure that the accumulated condensed water is drained completely but without excessive drainage. In a multi-split air conditioning system, if centralized drainage is adopted, factors such as the layout of the drainage pipeline and pressure balance also need to be considered to reasonably allocate the drainage time of each room.

[0062] Preferably, obtaining the refrigerable volume indoors based on the change result of the indoor temperature within the first time interval includes:

[0063] Obtaining the initial temperature value and the end temperature value within the first time interval;

[0064] Calculate the change rate of the indoor temperature based on the ratio of the difference between the initial temperature value and the end temperature value to the first time interval;

[0065] Determine whether the change rate of the indoor temperature within the first time interval exceeds a preset change rate threshold:

[0066] If the change rate of the indoor temperature exceeds the preset change rate threshold, perform a negative non-linear adjustment with the first reference coefficient as the base according to the ratio of the reference temperature change rate to the actual temperature change rate to generate a refrigerable volume correction coefficient;

[0067] If the change rate of the indoor temperature does not exceed the preset change rate threshold, perform a positive non-linear adjustment with the second reference coefficient as the base according to the ratio of the actual temperature change rate to the reference temperature change rate to generate a refrigerable volume correction coefficient;

[0068] Multiply the refrigerable volume correction coefficient by the standard room volume to obtain the actual value of the current refrigerable volume.

[0069] Specifically, first obtain the initial temperature value and the end temperature value within the first time interval, so as to calculate the change rate of the indoor temperature, and compare the change rate with the preset change rate threshold to determine whether the refrigeration effect is within the normal range or exceeds the expectation. Different adjustment mechanisms are used to generate a refrigerable volume correction coefficient according to different situations, that is, when the change rate exceeds the threshold, a negative non-linear adjustment is made to the first reference coefficient using the ratio of the actual change rate to the reference change rate; otherwise, a positive non-linear adjustment is made to the second reference coefficient using this ratio. Finally, multiply the correction coefficient by the standard room volume to obtain the actual refrigerable volume of the current room, thus accurately reflecting the effective refrigeration space range of the air conditioner under the current operating state and providing a key spatial parameter basis for the subsequent calculation of the internal unit capacity requirement of the air conditioner.

[0070] Among them, the preset change rate threshold is a reference value set according to air conditioner design standards and actual usage experience, and is used to judge whether the current cooling effect is normal. When the actual change rate exceeds this threshold, it indicates that the cooling effect may be too strong, which may be due to reasons such as a small room load or an excessive air conditioner capacity; otherwise, it means that the cooling effect is relatively weak. The reference temperature change rate is a standard reference value used to measure the temperature change speed under normal circumstances. It is negatively nonlinearly adjusted based on the first reference coefficient, which means that when the actual change rate is too large, the refrigerable volume correction coefficient is reduced in a non-linear manner, thereby appropriately reducing the estimated value of the refrigerable volume and avoiding overestimating the refrigeration space range of the air conditioner; and when the actual change rate is small, it is positively nonlinearly adjusted based on the second reference coefficient, that is, the correction coefficient is increased in a non-linear manner, and accordingly the estimated value of the refrigerable volume is increased to more accurately reflect the actual refrigeration space of the air conditioner. The refrigerable volume correction coefficient is a coefficient used to correct the standard room volume so that it better fits the actual refrigerable space of the room. The standard room volume is a preset fixed value based on common room sizes and general parameters of air conditioner design. Multiplying the refrigerable volume correction coefficient by the standard room volume finally obtains the actual value of the current refrigerable volume, which can accurately represent the size of the space that the air conditioner can effectively cool under the current conditions and provide accurate space parameters for subsequent energy demand calculations.

[0071] Exemplarily, during implementation, obtaining the initial temperature value and the end temperature value can be achieved through high-precision digital temperature sensors installed indoors. These sensors can collect indoor temperature data at a set time frequency (such as once per minute) and transmit the data to the control main board of the air conditioner. When calculating the indoor temperature change rate, it can be simply obtained by subtracting the initial temperature value from the end temperature value and then dividing by the duration of the first time interval. The setting of the preset change rate threshold requires referring to a large amount of experimental data and actual usage experience. For example, for an ordinary household room, a temperature drop of 0.5 degrees Celsius per minute can be set as a reasonable threshold. When performing negative non-linear adjustment, non-linear functions such as exponential functions or logarithmic functions can be used. Taking the ratio of the actual change rate to the reference change rate as the independent variable and the first reference coefficient as the initial value, a regulation model is constructed. For example, if the first reference coefficient is 1.0, when the ratio is 1.2, the correction coefficient calculated through the non-linear function is 0.8; similarly, for positive non-linear adjustment, a similar function model can also be used, but with the second reference coefficient as the initial value. When the ratio of the actual change rate to the reference change rate is 0.8, the correction coefficient calculated is 1.2. The standard room volume can be pre-calculated based on parameters such as the rated cooling capacity of the air conditioner and the common room air change rate. For example, for an air conditioner with a cooling capacity of 3500 watts, the standard room volume can be set to 50 cubic meters. Through different combination methods, such as using high-precision sensors in combination with complex non-linear adjustment functions, accurate calculation of the refrigerable volume can be achieved, but the cost and calculation complexity are relatively high; while using ordinary-precision sensors and simple linear adjustment methods can reduce costs, but the estimation accuracy may be slightly lower. A reasonable combination method is to minimize the system cost and calculation burden while ensuring basic accuracy, so as to achieve the technical effect of accurately calculating the refrigerable volume in a multi-connected air conditioner system.

[0072] Preferably, the calculating the internal unit energy requirement of the air conditioner according to the current indoor temperature, user requirements and the refrigerable volume indoors includes:

[0073] Obtaining the temperature difference value between the current indoor temperature and the user-set temperature;

[0074] Based on the absolute value of the temperature difference value and the refrigerable volume, calculating the initial energy requirement value of the internal unit of the air conditioner, wherein the initial energy requirement level is positively correlated with both the absolute value of the temperature difference value and the refrigerable volume;

[0075] Determining the air conditioner operation mode according to the positive or negative direction of the temperature difference value. When the temperature difference value is positive, proportionally correcting the initial energy requirement value in the cooling mode;

[0076] Adjust the corrected energy demand value based on the refrigerable volume: when the refrigerable volume decreases, reduce the energy demand weight per unit volume; when the refrigerable volume increases, increase the energy demand weight per unit volume, and calculate the energy demand value of the indoor unit of the air conditioner according to the energy demand weight.

[0077] Specifically, by obtaining the temperature difference value between the current indoor temperature and the user-set temperature, the demand intensity of the user for cooling or heating is quantified. Based on the absolute value of the temperature difference value and the refrigerable volume, the initial energy demand value of the indoor unit of the air conditioner is calculated. This is because the greater the temperature difference, the more energy the air conditioner usually needs to consume to reach the set temperature. At the same time, the larger the refrigerable volume, it means that the amount of air to be processed is more, and the energy consumption also increases accordingly. Therefore, the initial energy demand value is positively correlated with these two factors. Then, determine the operating mode of the air conditioner according to the positive and negative direction of the temperature difference value. When the temperature difference value is positive, it indicates that the current indoor temperature is higher than the set temperature, and the air conditioner needs to operate in the cooling mode. At this time, the initial energy demand value is proportionally corrected according to the characteristics of the cooling mode to better fit the energy consumption law under the cooling condition. Finally, adjust the corrected energy demand value based on the refrigerable volume. When the refrigerable volume decreases, reduce the energy demand weight per unit volume because a smaller refrigerable volume means that the actual amount of air to be processed decreases, and the energy required per unit volume should also be reduced; on the contrary, when the refrigerable volume increases, increase the energy demand weight per unit volume to ensure that sufficient energy covers a larger space, so as to obtain the final energy demand value of the indoor unit of the air conditioner, providing accurate energy demand data for subsequent energy-saving regulation.

[0078] Exemplarily, during the implementation process, to obtain the temperature difference value between the current indoor temperature and the user-set temperature, the indoor temperature can be monitored in real time through a high-precision digital temperature sensor, and the user-set temperature can be obtained from the air conditioner control panel, and the two are subtracted to obtain the temperature difference value. When calculating the initial energy demand level, the energy demand level query table corresponding to the absolute value of the temperature difference value and the refrigerable volume established in advance can be used, or mathematical models such as linear regression equations can be adopted, and the absolute value of the temperature difference value and the refrigerable volume are used as independent variables to input to obtain the initial energy demand value. When determining the operating mode, directly judge the positive and negative of the temperature difference value. If it is positive, call the energy demand correction algorithm in the cooling mode. This algorithm can proportionally correct the initial energy demand value according to the energy demand correction curve of the cooling mode fitted from a large amount of experimental data. For example, if the initial energy demand value is E0 and the correction coefficient is k1 (0 < k1 < 1, determined according to factors such as cooling efficiency), then the corrected energy demand value E1 = E0 × k1. When adjusting the energy demand weight per unit volume, establish a mapping relationship between the refrigerable volume and the energy demand weight. For example, when the refrigerable volume V is less than the standard volume V0, the weight coefficient w = w0 × (V / V0) a (a is a positive number less than 1); when V is greater than V0, w = w0 × (V / V0) β(β is a positive number greater than 1), and then the required energy value E = E1×w can be obtained. Different combinations of implementation methods, such as the cooperation of high-precision sensors and detailed mapping relationship models, can achieve accurate calculation of required energy, but the cost and calculation complexity are relatively high; while using relatively simple sensors and linear models can reduce the cost, but the accuracy is slightly lower. A reasonable combination method is to minimize the system cost and calculation burden on the premise of ensuring basic accuracy, so as to achieve the technical effect of accurately calculating the required energy of the indoor unit of the air conditioner in a multi-connected air conditioner system.

[0079] Preferably, the first adjustment of the required energy of the indoor unit of the air conditioner according to the indoor air humidity includes:

[0080] Obtain the real-time humidity value of the indoor air and the humidity change trend within a continuous time window;

[0081] Compare the real-time humidity value with a preset reference humidity threshold, and judge the deviation direction of the humidity based on the humidity change trend;

[0082] When the real-time humidity value is higher than the reference humidity threshold and the humidity change trend is continuously rising, generate a positive dynamic correction coefficient to increase the required energy value of the indoor unit of the air conditioner, where the positive dynamic correction coefficient increases with the increase of the amplitude of the humidity exceeding the reference humidity threshold and the rising rate of the humidity change trend;

[0083] When the real-time humidity value is lower than the reference humidity threshold and the humidity change trend is continuously falling, generate a negative dynamic correction coefficient to increase the required energy value of the indoor unit of the air conditioner, where the negative dynamic correction coefficient decreases with the increase of the amplitude of the humidity below the reference humidity threshold and the falling rate of the humidity change trend.

[0084] Specifically, first obtain the real-time humidity value of the indoor air and the humidity change trend within a continuous time window, which enables the system to not only know the current humidity state but also predict the dynamic trend of the humidity. Compare the real-time humidity value with a preset reference humidity threshold, and combine the humidity change trend to judge the deviation direction of the humidity, so as to determine whether the indoor humidity is continuously rising or falling. When the real-time humidity value is higher than the reference and shows an upward trend, it means that the indoor wet load is increasing. At this time, generate a positive dynamic correction coefficient to increase the required energy value, and this coefficient increases with the increase of the amplitude of the humidity exceeding the reference and the rising rate, ensuring that the air conditioner can output sufficient energy to cope with the high-humidity environment and maintain a comfortable indoor humidity level; on the contrary, when the humidity is lower than the reference and shows a downward trend, generate a negative dynamic correction coefficient to moderately reduce the required energy value. However, the expression "increase" here should be understood as the adjustment direction of the required energy value. In fact, the negative correction means reducing the required energy value, and the decrease means that the absolute value of the correction coefficient decreases with the increase of the amplitude of the humidity below the reference and the falling rate, avoiding energy waste caused by excessive dehumidification, so as to achieve the energy-saving and efficient operation of the air conditioner system under different humidity conditions.

[0085] The preset reference humidity threshold is a reference value set according to human comfort and air conditioner design standards, usually in the range of 40%-60% RH, and is used to determine whether the current indoor humidity is in an ideal state; the deviation direction of humidity, that is, whether the humidity is higher or lower than the reference value, determines whether the air conditioner needs to strengthen dehumidification or reduce dehumidification energy consumption. The positive dynamic correction coefficient is a coefficient used to increase the required energy value of the indoor unit of the air conditioner when the humidity is higher than the reference and rising. It increases with the increase of the amplitude of the humidity exceeding the reference and the rising rate, ensuring that the air conditioner can provide sufficient dehumidification capacity in a high-humidity environment; the negative dynamic correction coefficient is a coefficient used to moderately reduce the required energy value when the humidity is lower than the reference and decreasing, and it decreases with the increase of the amplitude of the humidity below the reference and the decreasing rate, avoiding waste of energy due to excessive dehumidification of the air conditioner. Through the synergistic effect of these parameters, the air conditioner system can dynamically adjust the required energy value according to the actual situation and change trend of indoor humidity, achieving precise energy-saving control.

[0086] Exemplarily, during implementation, to obtain the real-time humidity value and humidity change trend of indoor air, a high-precision capacitive humidity sensor can be installed near the return air outlet of the indoor unit, and humidity data can be collected at a high frequency (such as once every 30 seconds). The moving average method is used to filter out short-term fluctuation interference, and at the same time, the collected data is stored in the memory of the air conditioner control main board to form a humidity data sequence within a continuous time window for calculating the humidity change trend. The preset reference humidity threshold can be adjusted according to user preferences or the default settings of the air conditioner. It can be set at about 50% RH. When judging the humidity deviation direction, the real-time humidity value is compared with the reference value through simple numerical comparison. At the same time, a linear regression algorithm is used to fit the humidity data for a past period of time (such as 10 minutes) to obtain the slope of the humidity change trend. If the slope is positive, it is determined to be continuously rising, otherwise it is continuously falling. When generating the positive dynamic correction coefficient, a three-dimensional mapping relationship between the amplitude of the humidity exceeding the reference and the rising rate and the correction coefficient is established. For example, when the humidity exceeds the reference by 5% and the rising rate is 0.5% / minute, the correction coefficient is 1.2; the greater the exceeding amplitude or the higher the rising rate, the higher the correction coefficient. When generating the negative dynamic correction coefficient, a mapping relationship between the amplitude of the humidity below the reference and the decreasing rate and the correction coefficient is also established. For example, when the humidity is 3% below the reference and the decreasing rate is 0.3% / minute, the correction coefficient is 0.8; the greater the lower amplitude or the higher the decreasing rate, the lower the correction coefficient. Different combinations of implementation methods, such as high-precision sensors combined with complex mapping relationships and advanced algorithms, can achieve high-precision required energy adjustment, but the cost and computational complexity are relatively high; while using ordinary-precision sensors and simple linear models can reduce costs, but the adjustment accuracy is slightly lower.

[0087] Preferably, the second adjustment of the required energy of the indoor unit of the air conditioner according to the indoor-outdoor temperature difference includes:

[0088] Obtain the user - set temperature, the current indoor temperature, and the current outdoor temperature, calculate the absolute value of the indoor - outdoor temperature difference and the absolute value of the target temperature difference, where the absolute value of the target temperature difference is the difference between the current indoor temperature and the current outdoor temperature;

[0089] Judge whether the absolute value of the target temperature difference is in the interval that needs to be preferentially adjusted. When the absolute value of the target temperature difference is greater than the preset target temperature difference threshold, the absolute value of the target temperature difference is in the interval that needs to be preferentially adjusted, and judge whether the absolute value of the indoor - outdoor temperature difference exceeds the indoor heat conduction critical threshold;

[0090] When the absolute value of the target temperature difference is in the interval that needs to be preferentially adjusted and the absolute value of the indoor - outdoor temperature difference exceeds the heat conduction critical threshold, generate an energy - demand increase instruction, where the energy - demand increase amplitude is positively correlated with the product of the target temperature difference and the indoor - outdoor temperature difference;

[0091] When the absolute value of the target temperature difference is out of the interval that needs to be preferentially adjusted or the absolute value of the indoor - outdoor temperature difference is lower than the heat conduction critical threshold, generate an energy - demand decrease instruction, where the energy - demand decrease amplitude is negatively correlated with the ratio of the target temperature difference to the indoor - outdoor temperature difference;

[0092] Perform a second adjustment on the indoor unit energy - demand of the air conditioner according to the energy - demand instruction.

[0093] Specifically, first obtain the user - set temperature, the current indoor temperature, and the current outdoor temperature, calculate the absolute value of the indoor - outdoor temperature difference (the difference between the outdoor and indoor temperatures) and the absolute value of the target temperature difference (the difference between the set and outdoor temperatures). The former reflects the current intensity of indoor - outdoor heat exchange, and the latter reflects the heat - exchange demand under the ideal operating state of the air conditioner. Judge whether the absolute value of the target temperature difference is in the interval that needs to be preferentially adjusted, that is, whether it is greater than the preset target temperature difference threshold. This threshold is set according to the air - conditioner performance and human comfort. When the target temperature difference is too large, the indoor - outdoor heat exchange is intense, and the air conditioner needs to invest more energy to maintain the indoor temperature stability. Further judge whether the absolute value of the indoor - outdoor temperature difference exceeds the heat conduction critical threshold. This threshold represents the maximum limit of the natural heat transfer caused by the indoor - outdoor temperature difference. When exceeded, it means that the air conditioner needs to actively resist excessive heat exchange. When the target temperature difference is in the preferential adjustment interval and the indoor - outdoor temperature difference exceeds the heat conduction critical threshold, generate an energy - demand increase instruction, and the increase amplitude is positively correlated with the product of the target temperature difference and the indoor - outdoor temperature difference. The larger the product, the more intense the indoor - outdoor heat exchange and the greater the deviation from the ideal state, and the air conditioner needs to consume more energy to maintain indoor comfort. On the contrary, when the target temperature difference is out of the preferential adjustment interval or the indoor - outdoor temperature difference is lower than the heat conduction critical threshold, generate an energy - demand decrease instruction, and the decrease amplitude is negatively correlated with the ratio of the target temperature difference to the indoor - outdoor temperature difference. The smaller the ratio, the milder the indoor - outdoor heat exchange and the closer to the ideal state, and the air conditioner can reduce energy consumption. Finally, flexibly adjust the energy - demand according to the energy - demand instruction to ensure the efficient and energy - saving operation of the air conditioner under different indoor - outdoor temperature difference conditions.

[0094] Among them, the interval that needs to be adjusted preferentially refers to the range where the absolute value of the target temperature difference is greater than the preset target temperature difference threshold. The threshold is set comprehensively according to the air conditioner performance, energy-saving requirements, and human comfort. When the target temperature difference enters this interval, it indicates that the heat exchange between indoors and outdoors has exceeded the conventional adjustment ability range of the air conditioner, and it is necessary to preferentially increase the energy demand to ensure the stability of the indoor temperature. The critical threshold of heat conduction is the maximum value of the natural heat transfer caused by the temperature difference between indoors and outdoors. When this value is exceeded, the heat exchange intensity between indoors and outdoors exceeds the range that the air conditioner can naturally balance, and the air conditioner needs to increase the energy output additionally to resist the excessive heat exchange and maintain the indoor temperature. The energy demand increase instruction is a command triggered when specific conditions are met, indicating that the air conditioner increases the indoor unit energy demand. The increase amplitude is determined according to the product of the target temperature difference and the indoor-outdoor temperature difference. The larger the product, the more the energy demand increases, ensuring that the air conditioner can still meet the indoor temperature requirements under extreme temperature difference conditions.

[0095] Exemplarily, during the implementation process, when obtaining various temperature values, high-precision digital temperature sensors can be used and installed near the indoor unit return air outlet, the outdoor unit heat dissipation component, and the indoor temperature monitoring area of the air conditioner control panel respectively. The temperature data is collected at a high frequency (such as once per minute), and the Kalman filter algorithm is used to filter out the noise interference to improve the data accuracy. When calculating the absolute value of the indoor-outdoor temperature difference and the absolute value of the target temperature difference, the collected temperature data is directly called for simple arithmetic operations to determine whether the target temperature difference is in the preferential adjustment interval. The target temperature difference threshold needs to be preset, generally determined according to the air conditioner energy efficiency ratio and human comfort experimental data. For example, it is set at about 10°C. When the target temperature difference exceeds this value, it is determined to enter the preferential adjustment interval. When judging whether the indoor-outdoor temperature difference exceeds the critical threshold of heat conduction, the critical threshold of heat conduction is set with reference to the thermal performance of the building envelope structure and the air conditioner design parameters. For example, it is set at 15°C. When exceeded, the corresponding adjustment instruction is triggered. When generating the energy demand increase instruction, a mapping relationship between the product of the target temperature difference and the indoor-outdoor temperature difference and the energy demand increase amplitude is established. For example, when the product increases by 50°C² each time, the energy demand increases by 5%. When generating the energy demand decrease instruction, a mapping model between the ratio of the target temperature difference and the indoor-outdoor temperature difference and the energy demand decrease amplitude is constructed. For example, when the ratio decreases by 0.1 each time, the energy demand decreases by 3%.

[0096] Preferably, the third adjustment of the indoor unit energy demand of the air conditioner according to the air conditioner wind speed and direction adjustment parameters includes:

[0097] Obtain the current indoor temperature distribution uniformity parameter, the real-time wind speed gear, and the deviation degree of the air supply angle, where the deviation degree of the air supply angle is the absolute deviation angle value between the real-time air supply direction and the preset optimal cooling air supply direction, and the optimal cooling air supply direction is the direction with the highest regional temperature in the real-time indoor temperature distribution;

[0098] Determine whether the wind speed gear meets the recommended wind speed range matching the current refrigerable volume, and calculate whether the deviation degree of the air supply angle exceeds the cold quantity distribution failure threshold;

[0099] When the wind speed gear is lower than the recommended wind speed range and the indoor temperature distribution uniformity parameter exceeds the allowable fluctuation range, generate an energy demand improvement coefficient based on the product of the wind speed gear deviation degree and the temperature distribution fluctuation amplitude, and linearly enhance the energy demand value of the indoor unit of the air conditioner through the energy demand improvement coefficient;

[0100] When the deviation degree of the air supply angle exceeds the cold quantity distribution failure threshold and the wind speed gear is within the recommended wind speed range, generate an energy demand attenuation coefficient based on the ratio of the absolute value of the deviation degree of the air supply angle to the refrigerable volume, and stepwise reduce the energy demand value of the indoor unit of the air conditioner through the energy demand attenuation coefficient.

[0101] Specifically, first obtain the current indoor temperature distribution uniformity parameter, which reflects the degree of temperature difference in each area of the room; the real-time wind speed gear shows the current air supply speed of the air conditioner; the deviation degree of the air supply angle represents the deviation between the real-time air supply direction and the preset optimal refrigeration air supply direction, and the optimal refrigeration air supply direction is determined according to the direction with the highest temperature in the real-time indoor temperature distribution, ensuring that the cold quantity can be preferentially delivered to the area with the greatest need. Subsequently, by determining whether the wind speed gear is within the recommended wind speed range matching the current refrigerable volume and whether the deviation degree of the air supply angle exceeds the cold quantity distribution failure threshold, it can be determined whether the current air supply parameters are conducive to the effective distribution of cold quantity. When the wind speed is too low and the indoor temperature distribution is uneven, it indicates that the air supply power of the air conditioner is insufficient and cannot evenly deliver the cold quantity to the entire refrigerable volume space. At this time, generate an energy demand improvement coefficient based on the product of the wind speed gear deviation degree and the temperature distribution fluctuation amplitude, and by linearly enhancing the energy demand value, prompt the air conditioner to increase the operating power and improve the temperature distribution uniformity. When the deviation degree of the air supply angle is too large and the wind speed is within the recommended range, it means that although the wind speed is appropriate, the air supply direction deviates from the area with the greatest need for cold quantity, resulting in waste of some cold quantity. At this time, generate an energy demand attenuation coefficient based on the ratio of the absolute value of the deviation degree of the air supply angle to the refrigerable volume, and by stepwise reducing the energy demand value, make the air conditioner reduce the ineffective energy consumption, and at the same time encourage the air conditioner to adjust the air supply angle to the optimal direction, so as to realize the reasonable adjustment of the energy demand, improve the refrigeration efficiency and energy-saving performance of the air conditioner, and ensure the uniform comfort of the indoor temperature.

[0102] The indoor temperature distribution uniformity parameter refers to the temperature difference index between different indoor areas calculated from the data collected by multiple indoor temperature sensors, usually represented by statistical quantities such as temperature range and variance. It reflects the balance degree of the air-conditioning cooling effect in space. When this parameter exceeds the allowable fluctuation range, it means that there are obvious temperature non-uniform areas indoors, affecting user comfort. The real-time wind speed gear represents the current fan speed setting of the air conditioner. Different gears correspond to different air supply volumes and power outputs, which affect the cold quantity delivery speed and coverage. The recommended wind speed range is a pre-set wind speed range based on factors such as the refrigerable volume, air-conditioning performance, and indoor space layout. When the wind speed is within this range, the air conditioner can distribute the cold quantity to the entire refrigerable space with high efficiency and uniformity. The deviation degree of the air supply angle refers to the absolute deviation angle value between the real-time air supply direction and the preset optimal cooling air supply direction. The optimal cooling air supply direction is determined according to the direction with the highest regional temperature in the real-time indoor temperature distribution, that is, the air conditioner should give priority to delivering the cold quantity to the area with the highest temperature to achieve fast and effective cooling. The cold quantity distribution failure threshold is a critical value of the deviation degree of the air supply angle. When the deviation degree exceeds this threshold, it is considered that the cold quantity distribution begins to show obvious failure, and some areas cannot obtain enough cold quantity. The energy demand enhancement coefficient is a coefficient generated based on the product of the deviation degree of the wind speed gear (the difference between the lower limit of the recommended wind speed and the current wind speed gear) and the fluctuation range of the temperature distribution (the value by which the indoor temperature distribution uniformity parameter exceeds the allowable range), which is used to linearly enhance the energy demand value and prompt the air conditioner to increase the operating power to improve the temperature distribution. The energy demand attenuation coefficient is a coefficient generated based on the ratio of the absolute value of the deviation degree of the air supply angle to the refrigerable volume, which is used to stepwise reduce the energy demand value and enable the air conditioner to reduce the ineffective energy consumption caused by poor air supply angle. Through the synergistic effect of these parameters, the air-conditioning system can accurately adjust the energy demand according to the actual situation of the air supply parameters and the indoor temperature distribution, and optimize the cooling effect.

[0103] Exemplarily, during implementation, to obtain the indoor temperature distribution uniformity parameter, multiple high-precision digital temperature sensors can be distributed at different positions in the room (such as at the four corners and the center of the room), and temperature data can be collected at a certain frequency (such as once every 2 minutes). After being transmitted to the air conditioner control main board, the uniformity parameter can be calculated using the temperature variance formula. The real-time wind speed gear can be obtained through the control signal of the air conditioner fan drive circuit. For example, the PWM duty cycle signal of the fan motor corresponds to different gears, or the wind speed setting value on the air conditioner control panel can be directly read. When determining the optimal cooling air supply direction, based on the temperature data of each area collected by the indoor temperature sensors, the direction of the area with the highest temperature is found, which is generally represented by an angle value (such as 0° represents the front, 90° represents the right side, etc.). The real-time air supply direction is measured by the air deflector angle sensor. The recommended wind speed range needs to refer to the air conditioner performance curve and indoor space parameters. For example, for a small room, the recommended wind speed range can be set in the medium and low gear ranges. When judging whether the deviation degree of the air supply angle exceeds the cold quantity distribution failure threshold, this threshold is generally set at about 30° and can be adjusted according to experiments. When generating the energy demand improvement coefficient, a linear relationship between the product of the deviation degree of the wind speed gear (such as the difference between the recommended wind speed lower limit and the current gear) and the fluctuation amplitude of the temperature distribution (such as the part where the temperature variance exceeds the allowable value) and the improvement coefficient is established. For example, for every 10 increase in the product, the improvement coefficient increases by 0.1. When generating the energy demand attenuation coefficient, a step function of the ratio of the absolute value of the air supply angle deviation degree to the refrigerable volume and the attenuation coefficient is constructed. For example, when the ratio is between 0 - 0.1, the attenuation coefficient is 0.9; when the ratio is between 0.1 - 0.2, the attenuation coefficient is 0.8, and so on.

[0104] Preferably, based on the energy demand of the indoor unit of the air conditioner, the condensate output of the air conditioner per unit time can be obtained, satisfying the relationship:

[0105]

[0106] Where, Q c represents the condensate output of the air conditioner per unit time, Q b represents the condensate generation per unit time under the reference working condition, E adj represents the energy demand value after the first, second, and third regulations, E base represents the initial energy demand reference value, γ represents the energy demand influence index, λ i represents the correction coefficient of air humidity, indoor and outdoor temperature difference, or air conditioner wind speed and direction, ΔP i represents the deviation degree of the actual measured value of air humidity, indoor and outdoor temperature difference, or air conditioner wind speed and direction from the reference value.

[0107] Q bis the condensate water production rate of the air conditioner under standard test conditions (such as specific temperature, humidity, wind speed, etc.), which can be determined by experiments or provided by the manufacturer as the basic reference value for the model. The energy demand value E after the first, second, and third adjustments adj comprehensively reflects the actual energy demand of the air conditioner considering various factors such as indoor air humidity, indoor-outdoor temperature difference, and wind speed and direction, and the ratio with the initial energy demand reference value E base (i.e., the theoretical energy demand value of the air conditioner under the reference condition) can reflect the degree of change in the air conditioner's operating state relative to the reference condition. The energy demand influence index γ is an empirical constant used to describe the sensitivity of the energy demand change to the condensate water output, usually obtained by fitting a large amount of experimental data. A value greater than 1 indicates that an increase in energy demand will significantly increase the condensate water output, and a value less than 1 indicates a weaker influence. The correction coefficient λ i corresponds to different factors such as air humidity, indoor-outdoor temperature difference, or air conditioner wind speed and direction respectively. Each correction coefficient represents the influence of the corresponding factor on the condensate water output. For example, the humidity correction coefficient is relatively large because humidity has a significant impact on condensate water production. λ1 is the correction coefficient for air humidity, λ2 is the correction coefficient for the indoor-outdoor temperature difference, and λ3 is the correction coefficient for the air conditioner wind speed and direction. The deviation degree ΔP between the actual measurement value and the reference value i reflects the change range of the current environment or operating parameters relative to the standard reference value. For example, if the current humidity is 10% higher than the reference humidity, then ΔP i is 10%. After multiplying these deviation degrees by the correction coefficients and accumulating them, the condensate water output is further adjusted to make the model result more in line with the actual situation.

[0108] Exemplarily, in a high-temperature, high-humidity, and strong-wind cold-sending environment, γ = 1.1, λ1 = 0.07, λ2 = 0.05, λ3 = -0.03, where where RH actual represents the actual humidity value, ΔT actual represents the actual temperature difference, represents the wind speed deviation degree, represents the angle deviation degree. Therefore, Q c = 3, and the corresponding control effect is that the water pump runs for 18 minutes per hour, reducing by 12 minutes compared with the traditional method.

[0109] A multi-connected indoor unit fixed-frequency water pump energy-saving regulation system based on energy demand, as Figure 2 shown, the multi-connected indoor unit fixed-frequency water pump energy-saving regulation system is applied to the multi-connected indoor unit fixed-frequency water pump energy-saving regulation method as described above. The multi-connected indoor unit fixed-frequency water pump energy-saving regulation system includes:

[0110] The energy demand calculation module is used to obtain user requirements, change the operating power of the air conditioner to a first power corresponding to the user requirements within a first time interval, obtain the coolable volume in the room based on the change result of the indoor temperature within the first time interval, and calculate the indoor unit energy demand of the air conditioner according to the current indoor temperature, user requirements, and the coolable volume in the room.

[0111] The energy demand adjustment module is used to perform a first adjustment on the indoor unit energy demand of the air conditioner according to the indoor air humidity, perform a second adjustment on the indoor unit energy demand of the air conditioner according to the indoor-outdoor temperature difference, perform a third adjustment on the indoor unit energy demand of the air conditioner according to the air speed and direction adjustment parameters of the air conditioner, and obtain the condensate output of the air conditioner per unit time based on the indoor unit energy demand.

[0112] The pumping adjustment module is used to adjust the starting time and duration of the constant-frequency water pump according to the pumping capacity of the constant-frequency water pump and the condensate output of the air conditioner per unit time.

[0113] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0114] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for energy-saving regulation of a fixed-frequency water pump in a multi-split unit based on energy demand, characterized in that: The energy-saving adjustment method for the fixed-frequency water pump of a multi-split indoor unit includes: Obtaining user demand, changing the operating power of the air conditioner to a first power corresponding to the user demand within a first time interval, obtaining the indoor refrigerated volume based on the indoor temperature change result within the first time interval, and calculating the air conditioner internal function demand according to the current indoor temperature, the user demand and the indoor refrigerated volume; The air conditioner internal function needs to be adjusted first according to the indoor air humidity, the air conditioner internal function needs to be adjusted second according to the indoor and outdoor temperature difference, the air conditioner internal function needs to be adjusted third according to the air speed and direction adjustment parameters of the air conditioner, and the condensation water output of the air conditioner per unit time needs to be obtained based on the air conditioner internal function; According to the pumping capacity of the fixed-frequency water pump and the condensate output of the air conditioner per unit time, adjust the start-up time and start-up duration of the fixed-frequency water pump.

2. The energy-saving adjustment method for a fixed-frequency water pump in a multi-split unit according to claim 1 is characterized in that: The step of obtaining the indoor refrigerated volume based on the indoor temperature change result within the first time interval includes: Acquire an initial temperature value and an end temperature value within the first time interval; Calculate the rate of change of the indoor temperature according to the difference between the initial temperature value and the end temperature value and the ratio of the first time interval; Determine whether the change rate of the indoor temperature within the first time interval exceeds a preset change rate threshold: If the rate of change of the indoor temperature exceeds a preset rate of change threshold, a negative nonlinear adjustment is performed based on the ratio of the reference temperature rate of change to the actual temperature rate of change, taking the first reference coefficient as a base, to generate a refrigerated volume correction coefficient; If the rate of change of the indoor temperature does not exceed the preset rate of change threshold, a positive nonlinear adjustment is performed based on the ratio of the actual temperature rate of change to the reference temperature rate of change and a second reference coefficient is used as a base to generate a refrigerated volume correction coefficient; The refrigerated volume correction coefficient is multiplied by the standard room volume to obtain the actual value of the current refrigerated volume.

3. The energy-saving adjustment method for a fixed-frequency water pump in a multi-split unit according to claim 1 is characterized in that: The calculation of the air conditioner internal function according to the current indoor temperature, user demand and indoor refrigerated volume shall include: Get the temperature difference between the current indoor temperature and the temperature set by the user; Based on the absolute value of the temperature difference and the refrigerated volume, calculating the initial energy requirement of the air conditioner indoor unit, wherein the initial energy requirement level is positively correlated with the absolute value of the temperature difference and the refrigerated volume; Determine the air conditioning operation mode according to the positive and negative directions of the temperature difference value, and when the temperature difference value is positive, perform proportional correction on the initial energy demand value according to the cooling mode; The corrected energy demand value is adjusted based on the refrigerated volume: when the refrigerated volume decreases, the energy demand weight per unit volume is reduced; when the refrigerated volume increases, the energy demand weight per unit volume is increased, and the energy demand value of the air conditioner indoor unit is calculated according to the energy demand weight.

4. The energy-saving adjustment method for a fixed-frequency water pump in a multi-split unit according to claim 1 is characterized in that: The first adjustment of the air conditioner's internal functions according to the indoor air humidity includes: Obtain the real-time humidity value of indoor air and the humidity change trend within a continuous time window; Comparing the real-time humidity value with a preset reference humidity threshold, and determining the deviation direction of the humidity based on the humidity change trend; When the real-time humidity value is higher than the reference humidity threshold and the humidity change trend is continuously rising, a positive dynamic correction coefficient is generated to increase the energy demand value of the air conditioner indoor unit, wherein the positive dynamic correction coefficient increases with the increase of the amplitude of the humidity exceeding the reference humidity threshold and the rising rate of the humidity change trend; When the real-time humidity value is lower than the baseline humidity threshold and the humidity change trend is continuously decreasing, a negative dynamic correction coefficient is generated to increase the energy demand value of the air-conditioning indoor unit, wherein the negative dynamic correction coefficient decreases as the humidity is lower than the baseline humidity threshold and the decreasing rate of the humidity change trend increases.

5. The energy-saving adjustment method for a fixed-frequency water pump in a multi-split unit according to claim 1 is characterized in that: The second adjustment of the air conditioner's internal functions according to the indoor and outdoor temperature difference includes: Obtain the user set temperature, the current indoor temperature and the outdoor real-time temperature, calculate the absolute value of the indoor and outdoor temperature difference and the absolute value of the target temperature difference, wherein the absolute value of the target temperature difference is the difference between the current indoor temperature and the outdoor real-time temperature; Determine whether the absolute value of the target temperature difference is in the interval that needs to be adjusted first. When the absolute value of the target temperature difference is greater than a preset target temperature difference threshold, the absolute value of the target temperature difference is in the interval that needs to be adjusted first, and determine whether the absolute value of the indoor and outdoor temperature difference exceeds the critical threshold of indoor heat conduction; When the absolute value of the target temperature difference is in the interval that needs to be adjusted first and the absolute value of the indoor and outdoor temperature difference exceeds the critical threshold of heat conduction, an energy demand increase instruction is generated, wherein the energy demand increase amplitude is positively correlated with the product of the target temperature difference and the indoor and outdoor temperature difference; When the absolute value of the target temperature difference is out of the interval that needs to be adjusted first or the absolute value of the indoor and outdoor temperature difference is lower than the critical threshold of heat conduction, an energy demand reduction instruction is generated, wherein the energy demand reduction amplitude is negatively correlated with the ratio of the target temperature difference to the indoor and outdoor temperature difference; A second adjustment is made to the internal energy demand of the air conditioner according to the energy demand instruction.

6. The energy-saving adjustment method for a fixed-frequency water pump in a multi-split unit according to claim 1 is characterized in that: According to the wind speed and direction adjustment parameters of the air conditioner, the third adjustment of the air conditioner's internal functions includes: Obtain the current indoor temperature distribution uniformity parameter, real-time wind speed level and air supply angle deviation, wherein the air supply angle deviation is the absolute deviation angle value between the real-time air supply direction and the preset optimal cooling air supply direction, and the optimal cooling air supply direction is the direction with the highest regional temperature in the real-time indoor temperature distribution; Determine whether the wind speed level meets the recommended wind speed range that matches the current refrigerated volume, and calculate whether the air supply angle deviation exceeds the cooling capacity distribution failure threshold; When the wind speed level is lower than the recommended wind speed range and the indoor temperature distribution uniformity parameter exceeds the allowable fluctuation range, an energy demand enhancement coefficient is generated based on the product of the wind speed level deviation and the temperature distribution fluctuation amplitude, and the energy demand value of the air conditioner indoor unit is linearly enhanced by the energy demand enhancement coefficient; When the air supply angle deviation exceeds the cooling capacity distribution failure threshold and the wind speed gear is in the recommended wind speed range, an energy demand attenuation coefficient is generated based on the ratio of the absolute value of the air supply angle deviation to the refrigerated volume, and the energy demand value of the air conditioner indoor unit is reduced in a step-by-step manner through the energy demand attenuation coefficient.

7. The energy-saving adjustment method for a fixed-frequency water pump in a multi-split unit according to claim 1 is characterized in that: Based on the internal function of the air conditioner, the condensed water output of the air conditioner per unit time needs to be obtained, satisfying the relationship: Among them, Q c Indicates the condensed water output of the air conditioner per unit time, Q b Indicates the amount of condensed water generated per unit time under the benchmark conditions, E adj It represents the energy demand value after the first, second and third adjustments, E base represents the initial energy demand benchmark value, γ represents the energy demand impact index, and λ i Indicates the correction coefficient of air humidity, indoor and outdoor temperature difference or air conditioning wind speed and direction, ΔP i Indicates the deviation between the actual measured value and the reference value of air humidity, indoor and outdoor temperature difference, or air conditioning wind speed and direction.

8. An energy-saving regulation system for fixed-frequency water pumps in multiple units based on energy demand, characterized in that: The energy-saving regulation system for a fixed-frequency water pump for a multi-split indoor unit is applied to the energy-saving regulation method for a fixed-frequency water pump for a multi-split indoor unit according to any one of claims 1 to 7, and the energy-saving regulation system for a fixed-frequency water pump for a multi-split indoor unit comprises: an energy demand calculation module, for obtaining user demand, changing the operating power of the air conditioner to a first power corresponding to the user demand within a first time interval, obtaining the indoor refrigerated volume based on the indoor temperature change result within the first time interval, and calculating the air conditioner internal functional energy demand according to the current indoor temperature, the user demand and the indoor refrigerated volume; The energy demand adjustment module is used to perform a first adjustment on the air conditioner's internal energy demand according to the indoor air humidity, perform a second adjustment on the air conditioner's internal energy demand according to the indoor and outdoor temperature difference, perform a third adjustment on the air conditioner's internal energy demand according to the air speed and direction adjustment parameters of the air conditioner, and obtain the condensed water output of the air conditioner per unit time based on the air conditioner's internal energy demand; The pumping adjustment module is used to adjust the start time and start time of the fixed-frequency water pump according to the pumping capacity of the fixed-frequency water pump and the condensate output of the air conditioner per unit time.

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