Control method of water pump, air conditioning system and computer readable storage medium

Abstract

The application provides a water pump control method, an air conditioning system and a computer readable storage medium. The method comprises the following steps: entering a trial operation mode, starting the water pump between the water tank and the terminal; determining whether the water tank temperature decreases within a preset time; if yes, determining that the water system of the air conditioning system is a secondary system; if no, determining that the water system of the air conditioning system is a primary system. The application detects the water tank temperature under the trial operation condition, realizes the rapid distinction of the system type (the primary system or the secondary system), and can efficiently complete the system attribute identification in a short time without a complex sensor network or a cumbersome operation and maintenance test. The water pump is controlled to normally operate at a relatively energy-saving output power in the primary system, and the state of the water pump is determined according to whether the outlet water temperature of the secondary system corresponds to the air disc or the ground disc under different conditions, so that the system can reduce energy waste and reduce noise.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning engineering, in particular to a water pump control method, an air conditioning system and a computer readable storage medium. BACKGROUND

[0002] Currently, in the installation and use process of air conditioning engineering, the primary system and the secondary system are two common system connection modes.

[0003] The primary system refers to a cold source device (such as a cold water heat exchange unit) directly delivering refrigerant or chilled water to the terminal device (such as a fan coil or air conditioning box) through a pipeline to realize the transfer and supply of cold energy. In the primary system, all user terminals and the cold source device share a set of pipe network, and the water pump directly drives the circulation of the entire system. Due to the large system size and heavy water pump operation burden, improper water pump control can easily cause system circulation deficiency or over-flowing problems, thereby leading to low equipment operation efficiency or frequent failures.

[0004] The secondary system adopts a zoned and hierarchical connection mode, and an intermediate heat exchange link is added between the cold source device and the terminal user. The water system on the primary side and the secondary side respectively complete the delivery and distribution of cold energy. The primary side water system is responsible for delivering cold energy to the secondary side heat exchange device, and the secondary side distributes cold energy to specific terminal devices through an independent water pump system. The secondary system controls water flow and pressure through zoning, which not only improves the stability of system operation, but also realizes zoned energy saving. However, due to the high complexity of the system, the installation and maintenance costs are relatively high.

[0005] However, in the existing air conditioning system, the control of the water pump does not distinguish between the primary system and the secondary system, resulting in a mismatch between the control logic and the actual situation. SUMMARY

[0006] The present application proposes a water pump control method, an air conditioning system and a computer readable storage medium to solve the technical problem of unreasonable water pump control in the prior art.

[0007] The technical solution adopted by the present application is:

[0008] The present application proposes a water pump control method for an air conditioning system with a water tank and a water pump, characterized in that it comprises the following steps:

[0009] Enter the trial operation mode, and start the water pump between the water tank and the terminal;

[0010] Determine whether the water tank temperature decreases within a preset time;

[0011] If yes, determine that the water system of the air conditioning system is a secondary system, and if no, determine that the water system of the air conditioning system is a primary system.

[0012] Further, when the air conditioning system is determined as a primary system, the water pump is controlled to keep on, and the output power of the water pump is divided into multiple gears from low to high, and each gear is tested whether triggering the water flow switch protection from low to high, and the gear with the lowest output power without triggering the water flow switch protection is selected as the running gear.

[0013] Further, when the air conditioning system is determined as a secondary system, the type of the terminal is determined according to the running mode of the air conditioning system and the preset range in which the average water outlet temperature T1 in the running mode is located.

[0014] Specifically, the type of the terminal is determined according to the running mode of the air conditioning system and the preset range in which the average water outlet temperature T1 in the running mode is located, and specifically includes:

[0015] When the running mode of the air conditioner after starting is a cooling mode, and the running is kept for a preset time length, the average water outlet temperature T1 of the air conditioning system is detected;

[0016] If the average water outlet temperature T1 is within the second preset range, it is determined that the terminal is a wind disc, the water pump between the heat exchange unit and the water tank is controlled to switch to the closed state, and the water pump between the water tank and the terminal is controlled to keep or switch to the open state;

[0017] If the average water outlet temperature T1 is greater than or equal to the maximum value of the second preset range, it is determined that the terminal is a ground disc, and each water pump is adjusted to an intermittent start-stop state.

[0018] Specifically, the type of the terminal is determined according to the running mode of the air conditioning system and the preset range in which the average water outlet temperature T1 in the running mode is located, and specifically includes:

[0019] When the running mode of the air conditioner after starting is a heating mode, and the running is kept for a preset time length, the average water outlet temperature T1 of the air conditioning system is detected;

[0020] If the average water outlet temperature T1 is within the first preset range, it is determined that the terminal is a ground disc, and each water pump is adjusted to an intermittent start-stop state.

[0021] If the average water outlet temperature T1 is greater than or equal to the maximum value of the first preset range, it is determined that the terminal is a wind disc, the water pump between the heat exchange unit and the water tank is controlled to switch to the closed state, and the water pump between the water tank and the terminal is controlled to keep or switch to the open state.

[0022] Specifically, the average water outlet temperature T1 is the water outlet temperature on the water outlet side of the heat exchange unit.

[0023] The application also provides an air conditioning system using the above-mentioned water pump control method to control the operation of the water pump.

[0024] The application further provides a computer readable storage medium for storing a computer program, wherein the computer program performs the water pump control method.

[0025] Compared with the prior art, the application has the following advantages:

[0026] The application detects the temperature of the water tank under the trial operation condition, realizes the rapid distinction of the system type (primary system or secondary system), provides basic information for the subsequent intelligent control strategy of the water pump, improves the self-adaptive ability of the system, controls the water pump to normally operate at the energy-saving output power in the primary system, and simultaneously obtains the state of the water pump according to whether the outlet water temperature of the secondary system corresponds to the air disc or the ground disc under different conditions, so that the system can reduce the waste of energy and reduce the noise. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0028] Figure 1 is a flow chart of the embodiment of the application;

[0029] Figure 2 is a control flow chart of the primary system in the embodiment of the application;

[0030] Figure 3 is a control flow chart of the secondary system in the embodiment of the application;

[0031] Figure 4 is a pipe connection block diagram of the primary system in the embodiment of the application;

[0032] Figure 5 is a pipe connection block diagram of the secondary system in the embodiment of the application;

[0033] 1, heat exchange unit;

[0034] 2, water tank;

[0035] 3, end;

[0036] 41, first water pump; 42, second water pump. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific examples described herein are only intended to explain the present application and not to limit the present application.

[0038] The principles and structures of the present application will be described in detail below in conjunction with the accompanying drawings and examples.

[0039] In actual operation, since the water pump of the primary system directly serves the entire system, its operating state is crucial to the stability of the system. If the water pump control mode is improper, such as running at a high gear for a long time, it will lead to significant increase in energy consumption and noise pollution. In addition, in the prior art, after the air conditioning system runs to the set temperature point and stops, the water pump often remains in a state of continuous operation at a high gear, which has the following disadvantages: on the one hand, the water pump output power ratio is too high, and it is difficult to achieve the energy saving goal; on the other hand, the water pump running at high speed is noisy, which affects the user experience. If the water pump is completely closed, the water pipe may freeze in a low temperature environment, especially when the ambient temperature is below the freezing point, the stagnant water in the water pipe is easy to freeze, which leads to pipe cracking, affects the normal operation of the system, and even causes serious equipment failure. Based on this, we need a more intelligent water pump control mode that can directly distinguish whether the current system is a primary system or a secondary system at the initial stage of control, to prepare for subsequent specific control.

[0040] As shown in Figure 1 The present application proposes a water pump control method for an air conditioning system with a water tank, a heat exchange unit (such as a heat pump unit, a cold water unit, etc.), and multiple water pumps, including the following steps:

[0041] Enter the trial operation mode, start the water pump between the water tank and the terminal, and circulate the water flow in the pipeline within a short time to observe the real-time change of the water temperature in the water tank and preliminarily judge the water system state;

[0042] Determine whether the water tank temperature decreases within a preset time, compare the temperature threshold set by recording the water temperature change in the time period, and determine whether there is a secondary side heat exchange link in the system, so that the water temperature in the water tank is obviously decreased due to effective cold energy transfer during the circulation process;

[0043] If yes, it is determined that the water system of the air conditioning system is a secondary system, that is, the water tank temperature has a significant decrease within the preset time, indicating that there is an intermediate heat exchange device and an independent distribution waterway, so that the cold source side and the user side are relatively independent, and higher energy efficiency and operation stability can be achieved through fine control;

[0044] If not, the water system of the air conditioning system is determined as a primary system, i.e. if the water tank temperature does not show a significant drop in the time period, it indicates that the water path is directly connected to the end, the cold quantity transmission path is simple but the control requirement for the water pump is higher, and unnecessary energy consumption and noise problems are prone to occur.

[0045] The present application realizes rapid differentiation of the system type (primary system or secondary system) by detecting the water tank temperature under the trial operation condition, and provides basic information for the subsequent intelligent control strategy of the water pump. This method does not require a complex sensor network or tedious operation and maintenance test, and can efficiently complete the system attribute identification in a short time, thereby improving the self-adaptive ability of the system.

[0046] In a specific embodiment, when the air conditioning system is determined as a primary system, the water pump is controlled to remain on, and the output power of the water pump is divided into multiple gears from low to high. For example, the output power of the water pump is pre-set as a plurality of fixed values (such as 10%, 20%, 30%, 40%, 50% … of the rated power ratio), the power output is gradually increased from the lowest gear, and a pre-set time is run at each gear. When the water pump is running at a certain gear, the water flow is detected by using the water flow switch (such as a water flow sensor, a differential pressure switch or a flow meter) in the system, and once the water flow switch protection is triggered (indicating that the water flow state is abnormal, such as low flow causing the water pump to idle or pressure abnormality), the running at the gear is stopped and the next higher gear is adjusted to continue testing. By increasing the test gear, the lowest output power gear that does not trigger the water flow switch protection can be found, so that the power output of the water pump is reduced to the lowest under the premise of meeting the basic safety and stable operation of the system, thereby achieving excellent energy saving and noise reduction effect.

[0047] As shown in FIG. 1, Figure 2 In a specific embodiment, it is assumed that the water pump is divided into 10%, 20%, 30%, 40%, 50% to 100% corresponding to F1 to F10 ten gear output powers. When the system is determined as a primary system, the water pump is first run at 10% power, and the water flow is continuously monitored. If the water flow is stable and the switch protection is not triggered at this gear, 10% power is selected as the final running gear to ensure that the system can maintain normal flow at the lowest energy consumption. If the 10% gear triggers the water flow switch protection, it is immediately upgraded to 20% gear for retesting, and if the 20% gear still has problems, it is continuously upgraded until there is no abnormality at a certain gear (such as 30% power). In this way, the lowest suitable running power value is obtained by screening the gears.

[0048] By adopting the step-by-step test of the water pump power output in the primary system, the system can reduce the energy consumption of the water pump to the minimum under the premise of maintaining the necessary water flow safety and stability, which can not only reduce the energy consumption and operation cost, but also effectively reduce the operation noise, improve the user comfort, reduce the long-term wear and tear of the water pump and pipeline, prolong the service life of the equipment, and comprehensively improve the energy saving, stability and reliability of the air conditioning system.

[0049] When the air conditioning system is determined as a secondary system, the end type is further determined according to the operation mode of the air conditioning system and the preset range in which the average outlet water temperature T1 in the operation mode is located.

[0050] The technical scheme of determining the end type according to the operation mode of the secondary system and the outlet water temperature interval helps to realize the rapid classification of the diversified ends of the system and provide basic data support for the subsequent fine control strategy. Through the automatic identification of the end type, the control system can optimize the water pump speed and operation mode according to the differentiated requirements of different ends for water temperature and flow.

[0051] As shown in Figure 3 , the further determination of the end type according to the operation mode of the air conditioning system and the preset range in which the average outlet water temperature T1 in the operation mode is located includes:

[0052] When the operation mode of the air conditioner after starting is the cooling mode and the running time is maintained for a preset time, the average outlet water temperature T1 of the air conditioning system is detected;

[0053] If the average outlet water temperature T1 is within the second preset range (such as the range between T4 and T5 as shown in the figure), it is determined that the end is a fan coil type. At this time, by monitoring and comparing the outlet water temperature, the characteristic matching of the end and the fan coil in the typical low-temperature cooling interval is determined, so that rapid end identification is realized without additional complex sensors, and the water pump between the heat exchange unit and the water tank is controlled to be in the closed state according to the identification result, further reducing the invalid energy consumption and water circulation noise. At the same time, the water pump between the water tank and the end is controlled to be in the open state or switched to the open state, so that the end obtains the necessary water flow and cold supply, effectively improving the cold utilization rate and comfort.

[0054] If the average outlet water temperature T1 is greater than or equal to the maximum value of the second preset range, it is determined that the end is a floor panel. The requirement of the water supply temperature is close to the operating characteristics of the floor panel end, that is, the temperature of the floor panel is relatively high to avoid frost cracking. Based on this determination, each water pump is controlled to enter an intermittent start-stop state, and by reasonably setting the start-stop period, intermittent operation can not only meet the moderate cooling demand of the floor panel end, that is, the strong cold storage capacity, but also effectively reduce the water pump operation noise.

[0055] When the operation mode of the air conditioning system is the heating mode, and the running preset time is maintained, the average outlet water temperature T1 of the air conditioning system is detected;

[0056] If the average outlet water temperature T1 is within the first preset range (such as the range between T2 and T3 as shown in the figure), it is determined that the terminal is a floor panel, which indicates that the operation requirement of the terminal meets the characteristic requirement of the floor panel system, such as the operation temperature range of the radiant heating system. For this type of terminal, the water pumps are controlled to be adjusted to an intermittent start-stop state. The intermittent start-stop can meet the relatively moderate heat requirement of the floor panel terminal, ensure the continuity and stability of heating, and reduce the high energy consumption and equipment wear caused by long-time operation of the water pump.

[0057] If the average outlet water temperature T1 is greater than or equal to the maximum value of the first preset range, it is determined that the terminal is a fan coil. At this time, the system operation characteristic indicates that the terminal heating threshold is high, which is a high-efficiency heating mode of the fan coil type. For this type of terminal, the water pump between the heat exchanger unit and the water tank is controlled to be switched to the closed state to avoid unnecessary heat transfer loss and water pump energy consumption. At the same time, the water pump between the water tank and the terminal is controlled to remain or be switched to the open state to ensure that the fan coil terminal can efficiently obtain the required heat and optimize the heating efficiency and stability.

[0058] That is, by detecting the change of the average outlet water temperature T1 in the heating mode, combining the preset temperature range to identify the terminal type, and reasonably adjusting the water pump operation mode according to the terminal characteristics, the system energy consumption and operation noise are effectively reduced, and the heating requirement of the floor panel terminal under different load conditions is ensured.

[0059] The specific implementation example containing temperature range values is as follows:

[0060] In the secondary system, the terminal types are various, such as fan coil (referred to as fan coil), radiant terminal (such as floor heating coil, referred to as floor panel), or other special terminal equipment. Different types of terminals have specific requirements and operation characteristics for water supply temperature. By previously setting the corresponding relationship between multiple temperature intervals and terminal types (such as the 7-12℃ interval in the cooling mode as the typical water supply temperature range of the fan coil, and the 20-25℃ interval as the characteristic temperature range of other terminal types such as the floor panel; the 30-40℃ interval in the heating mode may correspond to the water supply temperature range of the floor panel terminal, and the 40-50℃ interval may correspond to the water supply temperature range of the fan coil), the outlet water temperature T1 is sampled and averaged during the stable stage of normal operation of the air conditioning system, and then the value of T1 is compared with the preset range to quickly identify the terminal type.

[0061] Specifically, the average outlet water temperature T1 is the average temperature of the outlet of the heat exchanger unit in the secondary system within a unit time. This temperature can reflect the actual operation condition of the heat exchanger unit within a period of time, so as to be used to determine the terminal type.

[0062] The application further provides an air conditioning system using the control method of the water pump to control the operation of the water pump.

[0063] That is, the application realizes the rapid distinction of the system type (primary system or secondary system) by detecting the temperature of the water tank under the trial operation condition, and provides basic information for the subsequent intelligent control strategy of the water pump. This method can efficiently complete the system attribute identification in a short time without complex sensor network or tedious operation and maintenance test, and is beneficial to reduce energy consumption, reduce noise, and improve the safety and reliability of the equipment operation.

[0064] The primary system specifically as shown in Figure 4 includes a heat exchange unit 1, a water tank 2 and a terminal 3, and a first water pump 41 is arranged on the outlet side of the heat exchange unit, and a second water pump 42 is arranged between the water tank and the terminal, which can send the water of the terminal back to the water tank to improve the circulation efficiency.

[0065] The secondary system specifically as shown in Figure 5 includes a heat exchange unit 1, a water tank 2 (it should be noted that the water tank is a water tank with a heat exchanger inside, that is, the pipeline on one side of the water tank is connected to the internal heat exchanger, and the pipeline on the other side is connected to the water tank) and a terminal 3, and a first water pump 41 is arranged on the circulation pipeline between the heat exchange unit and the water tank, and a second water pump 42 is arranged between the water tank and the terminal for circulation.

[0066] The application further provides a computer readable storage medium for storing a computer program, which executes the control method of the water pump when running.

[0067] It should be noted that the terms used above are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0068] Unless otherwise specified, the relative arrangement of the components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the application. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship.

[0069] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical" and "horizontal" as can be perceived herein relative to the accompanying drawings refer to the orientation of the components being described. However, it is to be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device described herein relative to the other device or structure is inverted, then a spatially relative term such as "above" can be interpreted as meaning "below" or "below" can be interpreted as meaning "above". The device can also be oriented in other ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0070] In addition, it should be pointed out that the use of the terms "first", "second" and the like in connection with various elements is merely intended for identification, and does not constitute a special meaning, and therefore cannot be interpreted as a limitation on the scope of protection of the present application.

[0071] The preferred embodiments of the present application have been described above with the purpose of enabling not only the best modes contemplated by the inventors of carrying out the application, but also as examples of embodiments of the present application to enable others skilled in the art to utilize the application in various embodiments and with various modifications as are suited to the particular use contemplated. Therefore, the above description is not intended to limit the scope of the application, and it is to be understood that any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the present application.

Claims

1. A method for controlling a water pump, used in an air conditioning system having a water tank and a water pump, characterized in that, Including the following steps: Enter trial operation mode and turn on the water pump between the water tank and the terminal. Determine if the water tank temperature drops within a preset time; If yes, the water system of the air conditioning system is determined to be a secondary system; otherwise, the water system of the air conditioning system is determined to be a primary system. When the air conditioning system is determined to be a secondary system, the type of terminal is determined according to the operating mode of the air conditioning system and the preset range of the average outlet water temperature T1 in the operating mode. Through automatic identification of the terminal type, the system can optimize the pump speed and operating mode according to the different requirements of different terminals for water temperature and flow rate. When the air conditioning system is determined to be a primary system, the water pump is kept running. The primary system refers to the heat exchanger unit directly delivering refrigerant or chilled water to the terminal equipment through pipelines; the secondary system refers to the heat exchanger unit and the terminal user having an additional intermediate heat exchange link; the average outlet water temperature T1 is the average temperature of the heat exchanger unit outlet in the secondary system per unit time.

2. The water pump control method as described in claim 1, characterized in that, When the air conditioning system is determined to be a primary system, the output power of the water pump is divided into multiple levels from low to high, and each level is tested from low to high to see if the water flow switch protection is triggered. The level with the lowest output power that does not trigger the water flow switch protection is selected as the operating level.

3. The water pump control method as described in claim 1, characterized in that, The determination of the terminal type based on the air conditioning system's operating mode and the preset range of the average outlet water temperature T1 within that operating mode specifically includes: When the air conditioner is turned on and operates in cooling mode, and maintains the preset operating time, the average outlet water temperature T1 of the air conditioning system is detected. If the average outlet water temperature T1 is within the second preset range, the terminal is determined to be a fan coil unit, and the water pump between the heat exchange unit and the water tank is controlled to switch to the off state, while the water pump between the water tank and the air conditioning terminal is controlled to remain or switch to the on state.

4. The water pump control method as described in claim 3, characterized in that, If the average outlet water temperature T1 is greater than or equal to the maximum value of the second preset range, the terminal is determined to be the ground, and each water pump is controlled to adjust to an intermittent start-stop state.

5. The water pump control method as described in claim 1, characterized in that, The determination of the terminal type based on the air conditioning system's operating mode and the preset range of the average outlet water temperature T1 within that operating mode specifically includes: When the air conditioner is turned on and operates in heating mode for a preset duration, the average outlet water temperature T1 of the air conditioning system is detected. If the average outlet water temperature T1 is within the first preset range, the terminal is determined to be the ground, and each water pump is controlled to adjust to an intermittent start-stop state.

6. The water pump control method as described in claim 5, characterized in that, If the average outlet water temperature T1 is greater than or equal to the maximum value of the first preset range, the terminal is determined to be a fan coil unit, and the water pump between the heat exchange unit and the water tank is controlled to switch to the off state, while the water pump between the water tank and the terminal is controlled to remain or switch to the on state.

7. The water pump control method as described in claim 1, characterized in that, The average outlet water temperature T1 is the outlet water temperature on the outlet side of the heat exchanger unit.

8. An air conditioning system, characterized in that, The operation of the water pump is controlled using the water pump control method as described in any one of claims 1 to 7.

9. A computer-readable storage medium for storing a computer program, characterized in that, When the computer program is executed, it performs the pump control method as described in any one of claims 1 to 7.

Images