Water pump control method, air conditioning system and computer readable storage medium

Abstract

The invention provides a water pump control method, an air conditioning system and a computer readable storage medium, and the method comprises the following steps: entering a pilot run mode, and starting a water pump between a water tank and a tail end; judging whether the temperature of the water tank drops within a preset time; if yes, the water system of the air conditioning system is judged to be a secondary system, and if not, the water system of the air conditioning system is judged to be a primary system. According to the method, the temperature of the water tank is detected under the pilot run condition, the system types (a primary system or a secondary system) are rapidly distinguished, a complex sensor network or tedious operation and maintenance tests are not needed in the mode, and system attribute recognition can be efficiently completed within a short time. The water pump is controlled to normally operate in the primary system with energy-saving output power, and the state of the water pump is obtained according to whether the outlet water temperature of the secondary system corresponds to the wind 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 invention relates to the technical field of air conditioning engineering, and in particular to a water pump control method, an air conditioning system and a computer-readable storage medium. Background Art

[0002] At present, in the installation and use of air-conditioning projects, primary system and secondary system are two common system connection methods.

[0003] The primary system refers to the cold source equipment (such as a chiller) directly transporting refrigerant or chilled water to the terminal equipment (such as a fan coil or air conditioning box) through pipelines to achieve the transfer and supply of cold capacity. In the primary system, all user terminals and cold source equipment share a set of pipes, and the water pump directly drives the circulation of the entire system. Due to the large scale of the system and the heavy operating burden of the water pump, once the water pump is improperly controlled, it is easy to have insufficient system circulation or overcurrent problems, which will lead to low equipment operation efficiency or frequent failures.

[0004] The secondary system adopts a partitioned and graded connection method. An intermediate heat exchange link is added between the cold source equipment and the end user, and the cold is transported and distributed through the primary and secondary water systems. The primary water system is responsible for transporting the cold to the secondary heat exchange equipment, and the secondary side distributes the cold to specific end equipment through an independent water pump system. The secondary system controls the water flow and pressure by partitioning, which not only improves the stability of the system operation, but also achieves energy saving in partitions. 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, which causes the control logic to be inconsistent with the actual situation. Summary of the invention

[0006] In order to solve the technical problem of unreasonable water pump control in the above-mentioned prior art, the present invention proposes a water pump control method, an air conditioning system and a computer-readable storage medium.

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

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

[0009] Entering the trial operation mode, turning on the water pump between the water tank and the terminal;

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

[0011] If so, it is determined that the water system of the air-conditioning system is a secondary system; if not, it is determined that the water system of the air-conditioning system is a primary system.

[0012] Furthermore, when the air-conditioning system is determined to be 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, and each gear is tested from low to high to see whether it triggers the water flow switch protection, and the gear with the lowest output power that does not trigger the water flow switch protection is selected as the operating gear.

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

[0014] Specifically, the determination of the type of the terminal according to the operation mode of the air conditioning system and the preset range of the average water outlet temperature T1 in the operation mode specifically includes:

[0015] When the air conditioner is started and the operating mode is cooling mode, and the operating time is kept preset, the average outlet water temperature T1 of the air conditioner system is detected;

[0016] If the average outlet water temperature T1 is within the second preset range, the terminal is determined to be a fan disk, the water pump between the heat exchanger unit and the water tank is controlled to be switched to the off state, and the water pump between the water tank and the terminal is controlled to remain or switch to the on state;

[0017] 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 chassis, and each water pump is controlled to be adjusted to an intermittent start-stop state.

[0018] Specifically, the determination of the type of the terminal according to the operation mode of the air-conditioning system and the preset range of the average outlet water temperature T1 in the operation mode specifically includes:

[0019] When the air conditioner is started and the operating mode is heating mode, and the preset operation time is maintained, the average outlet water temperature T1 of the air conditioner system is detected;

[0020] If the average outlet water temperature T1 is within the first preset range, the terminal is determined to be the chassis, and each water pump is controlled to be 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, the terminal is determined to be a fan disk, and the water pump between the heat exchanger unit and the water tank is controlled to switch to the off state, and the water pump between the water tank and the terminal is controlled to remain or switch to the on state.

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

[0023] The present invention also provides an air conditioning system, which uses the above-mentioned water pump control method to control the operation of the water pump.

[0024] The present invention also proposes a computer-readable storage medium for storing a computer program, wherein the computer program executes the above-mentioned water pump control method when running.

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

[0026] The present invention detects the water tank temperature under the trial operation condition to quickly distinguish the system type (primary system or secondary system), provide basic information for the subsequent intelligent control strategy of the water pump, and improve the system's adaptive ability. The water pump is controlled to operate normally with a more energy-saving output power in the primary system, and the water outlet temperature of the secondary system under different conditions corresponds to the fan disk or the ground disk, and the state of the water pump is obtained at the same time, so that the system can reduce energy waste and reduce noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 is a flow chart of an embodiment of the present invention;

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

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

[0031] Figure 4 It is a pipeline connection block diagram of a primary system in an embodiment of the present invention;

[0032] Figure 5 is a pipeline connection block diagram of a secondary system in an embodiment of the present invention;

[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 to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[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 is improperly controlled, such as running at a high level for a long time, it will lead to a significant increase in energy consumption and noise pollution. In addition, in the prior art, when the air-conditioning system runs to the set temperature point and shuts down, the water pump often maintains a high-level continuous operation state, which brings the following disadvantages: on the one hand, the proportion of water pump output power is high, making it difficult to achieve energy-saving goals; on the other hand, the high-speed running water pump is noisy, affecting the user experience. If the water pump is completely shut down, the water pipe may freeze in a low temperature environment. In particular, when the ambient temperature is below the freezing point, the stagnant water in the water pipe is easy to freeze, causing the pipe to freeze and crack, affecting the normal operation of the system, and even causing serious equipment failures. Based on this, we need a more intelligent water pump control method that can directly distinguish whether the current system is a primary system or a secondary system at the beginning of the control, so as to prepare for subsequent specific control.

[0040] like Figure 1 As shown, the present invention proposes a water pump control method for an air conditioning system having a water tank, a heat exchange unit (such as a heat pump unit, a chiller, etc.), and multiple water pumps, comprising the steps of:

[0041] Enter the trial operation mode and start the water pump between the water tank and the terminal. In this way, the water flow circulates in the pipeline in a short time, so as to observe the real-time change of the water temperature in the water tank and preliminarily judge the water status of the system;

[0042] Determine whether the water tank temperature drops within the preset time. By recording the water temperature changes within the time period and comparing them with the set temperature threshold, it is possible to identify whether there is a secondary heat exchange link inside the system, so that the water temperature in the water tank is effectively cooled during the circulation process and shows an obvious cooling trend.

[0043] If so, the water system of the air conditioning system is determined to be a secondary system, that is, the significant drop in the water tank temperature within the preset time indicates the existence of an intermediate heat exchange device and an independent water distribution circuit, so that the cold source side and the user side operate relatively independently, 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 to be a primary system. That is, if the water tank temperature does not drop significantly during this time period, it indicates that the water circuit is directly connected to the end. The cold transfer path is simple but the water pump control requirements are high, which is prone to unnecessary energy consumption and noise problems.

[0045] The present invention detects the water tank temperature under trial operation conditions to quickly distinguish the system type (primary system or secondary system), providing basic information for the subsequent intelligent control strategy of the water pump. This method does not require a complex sensor network or cumbersome operation and maintenance tests, and can efficiently complete system attribute identification in a short time, improving the system's adaptive ability.

[0046] In a specific embodiment, when the air conditioning system is determined to be a primary system, the water pump is controlled to remain turned 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 to several fixed values ​​(such as 10%, 20%, 30%, 40%, 50% ... of the rated power ratio), and the power output is gradually increased from the lowest gear, and it is operated for a preset time at each gear. When the water pump is running at a certain gear, the water flow switch in the system (such as a water flow sensor, a pressure difference switch or a flow meter) is used to detect the water flow. Once the water flow switch protection is triggered (indicating that the water flow state is abnormal, such as too low flow causing the water pump to run idle or abnormal pressure), it stops running at this gear and is adjusted to the next higher gear to continue testing. By increasing the test gear, the lowest output power gear that will not trigger the water flow switch protection can be found, so that the power output of the water pump is reduced to the minimum under the premise of meeting the basic safety and stable operation of the system, thereby achieving a relatively excellent energy saving and noise reduction effect.

[0047] like Figure 2 As shown, in a specific embodiment, it is assumed that the water pump is divided into ten output power gears of 10%, 20%, 30%, 40%, 50% to 100% corresponding to F1 to F10. When the system is determined to be a primary system, the water pump first runs at 10% power and continuously monitors the water flow. If the water flow is stable at this gear and the switch protection is not triggered, 10% power is selected as the final operating 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 will immediately rise to the 20% gear and retest. If there is still a problem with the 20% gear, continue to rise until it runs without abnormality at a certain gear (such as 30% power). In this way, the lowest suitable operating power value is obtained by screening one gear at a time.

[0048] By adopting the method of step-by-step testing of the water pump power output in the primary system, the system can reduce the water pump energy consumption to a minimum while maintaining the necessary water flow safety and stability. This can not only reduce energy consumption and operating costs, but also effectively reduce operating noise and improve user comfort. At the same time, it can reduce the long-term wear of the water pump and pipelines, extend the service life of the equipment, and thus comprehensively improve the energy saving, stability and reliability of the air-conditioning system.

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

[0050] The above technical solution of determining the terminal type based on the secondary system operation mode and the outlet water temperature range helps to quickly classify the diverse terminals of the system and provide basic data support for subsequent refined control strategies. Through automatic identification of terminal types, the control system can optimize the pump speed and operation mode according to the differentiated requirements of different terminals for water temperature and flow.

[0051] like Figure 3 As shown, according to the operation mode of the air conditioning system and the preset range of the average water outlet temperature T1 in the operation mode, the terminal type is further determined to include:

[0052] When the air conditioner is started and the operating mode is cooling mode, and the operating time is kept preset, the average outlet water temperature T1 of the air conditioner system is detected;

[0053] If the average outlet water temperature T1 is within the second preset range (the range between T4 and T5 as shown in the figure), the terminal is determined to be a fan coil type. At this time, the outlet water temperature is monitored and the interval is compared to determine the feature match between the terminal and the fan coil in the typical low-temperature refrigeration range, thereby achieving rapid terminal identification without the need for additional complex sensors. According to the identification result, the water pump between the heat exchanger unit and the water tank is controlled to switch to the off state, further reducing invalid energy output and water circulation noise. At the same time, the water pump between the water tank and the terminal is controlled to remain or switch to the on state, so that the terminal obtains the necessary water flow and cooling supply, effectively improving cooling utilization and comfort.

[0054] If the average water outlet temperature T1 is greater than or equal to the maximum value of the second preset range, the terminal is determined to be a chassis, and the water supply temperature requirement is close to the operating characteristics of the chassis terminal, that is, the chassis temperature is higher to avoid freezing and cracking. Based on this judgment, each water pump is controlled to enter an intermittent start-stop state. By reasonably setting the start-stop cycle, intermittent operation can not only meet the moderate cooling demand of the chassis terminal, that is, strong cold storage capacity, but also effectively reduce the running noise of the water pump.

[0055] When the operation mode of the air conditioning system is the heating mode and the operation is maintained for a preset time, 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 (the range between T2 and T3 as shown in the figure), the terminal is determined to be a base, which indicates that the terminal operation requirements meet the characteristic requirements of the base system, such as the operating temperature range of the radiant heating system. For this type of terminal, each water pump is controlled to be adjusted to an intermittent start-stop state. Intermittent start-stop can meet the relatively mild heat demand of the base terminal, ensure the continuity and stability of heating, and reduce the high energy consumption and equipment wear caused by long-term 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, the terminal is determined to be a fan coil. At this time, the system operation characteristics indicate that the terminal heat supply threshold is high, which is an efficient heating method 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 switch to the off 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 switch to the on 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 in the average water outlet temperature T1 in the heating mode, identifying the terminal type in combination with the preset temperature range, and reasonably adjusting the water pump operation mode according to the terminal characteristics, it not only effectively reduces the system energy consumption and operating noise, but also ensures the heating demand of the terminal under different load conditions.

[0059] The specific embodiments including the temperature range values ​​are as follows:

[0060] In the secondary system, there are various types of terminals, such as fan coil units (referred to as fan coils), radiation terminals (such as floor heating coils, referred to as floor heating coils) or other special terminal equipment. Different types of terminals have specific requirements and operating characteristics for the water supply temperature. By pre-setting the correspondence between multiple groups of temperature ranges and terminal types (such as the 7℃~12℃ range in cooling mode is the typical water supply temperature range of fan coils, and the 20℃~25℃ range is the characteristic temperature range of other terminal types such as floor heating coils; the 30℃~40℃ range in heating mode may correspond to the water supply temperature range of floor heating coil terminals, and 40℃~50℃ may correspond to the water supply temperature range of fan coils), 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 water of the heat exchanger unit in the secondary system per unit time. This temperature can reflect the actual operating conditions of the heat exchanger unit over a period of time, and can thus be used to determine the terminal type.

[0062] The present invention also proposes an air conditioning system, which uses the above-mentioned water pump control method to control the operation of the water pump. The water system of the air conditioning system is a primary system or a secondary system.

[0063] That is, the present invention detects the water tank temperature under trial operation conditions to quickly distinguish the system type (primary system or secondary system), providing basic information for the subsequent intelligent control strategy of the water pump. This method does not require a complex sensor network or cumbersome operation and maintenance tests, and can efficiently complete system attribute identification in a short time, which is conducive to reducing energy consumption, reducing noise, and improving the safety and reliability of equipment operation.

[0064] One of the systems is as follows Figure 4 As shown, it includes a heat exchanger unit 1, a water tank 2 and an end 3, and a first water pump 41 is arranged on the water outlet side of the heat exchanger unit, and a second water pump 42 is arranged between the water tank and the end, which can return the water at the end to the water tank to improve the circulation efficiency.

[0065] The secondary system is as follows Figure 5 As shown, it includes a heat exchanger 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 provided on the circulation pipeline between the heat exchanger unit and the water tank, and a second water pump 42 is provided between the water tank and the terminal for circulation.

[0066] The present invention also proposes a computer-readable storage medium for storing a computer program, and the computer program executes the above-mentioned water pump control method when running.

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

[0068] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that for ease of description, the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship.

[0069] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0070] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water pump control method for an air conditioning system having a water tank and a water pump, characterized in that: Includes steps: Entering the trial operation mode, turning on the water pump between the water tank and the terminal; Determine whether the water tank temperature drops within the preset time; If so, it is determined that the water system of the air-conditioning system is a secondary system; if not, it is determined that the water system of the air-conditioning system is a primary system.

2. The water pump control method according to claim 1, characterized in that: When the air-conditioning system is determined to be 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, and each gear is tested from low to high to see whether it triggers the water flow switch protection, and the gear with the lowest output power that does not trigger the water flow switch protection is selected as the operating gear.

3. The water pump control method according to claim 1, characterized in that: When the air conditioning system is determined to be a secondary system, the type of the terminal is 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.

4. The water pump control method according to claim 3, characterized in that: The determining of the type of the terminal according to the operation mode of the air conditioning system and the preset range of the average water outlet temperature T1 in the operation mode specifically includes: When the air conditioner is started and the operating mode is cooling mode, and the operating time is kept preset, the average outlet water temperature T1 of the air conditioner system is detected; If the average outlet water temperature T1 is within the second preset range, the terminal is determined to be a fan disk, the water pump between the heat exchanger unit and the water tank is controlled to switch to an off state, and the water pump between the water tank and the air conditioning terminal is controlled to remain in or switch to an on state.

5. The water pump control method according to claim 4, 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 chassis, and each water pump is controlled to be adjusted to an intermittent start-stop state.

6. The water pump control method according to claim 3, characterized in that: The method of determining the type of the terminal according to the operation mode of the air conditioning system and the preset range of the average water outlet temperature T1 in the operation mode specifically includes: When the air conditioner is started and the operating mode is heating mode, and the preset operation time is maintained, the average outlet water temperature T1 of the air conditioner system is detected; If the average outlet water temperature T1 is within the first preset range, the terminal is determined to be the chassis, and each water pump is controlled to be adjusted to an intermittent start-stop state.

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

8. The water pump control method according to claim 1, characterized in that: The average outlet water temperature T1 is the outlet water temperature of the outlet water side of the heat exchanger unit.

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

10. A computer-readable storage medium for storing a computer program, characterized in that: When the computer program is executed, the water pump control method according to any one of claims 1 to 8 is executed.

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