Control method and device of a dynamic heat pipe air conditioner

Abstract

The application provides a control method and device of a power heat pipe air conditioner, which comprises the following steps: obtaining an operating parameter of a refrigerant pump when an air conditioning unit is operating; obtaining a stability parameter of the air conditioning unit operating according to the operating parameter; and adjusting the operating mode of the air conditioning unit to the operating mode of the air conditioning unit that meets the stability requirement and has the lowest energy consumption according to the stability parameter. By collecting the operating parameter during the operation of the air conditioning unit, the stability parameter that can reflect the operating state of the air conditioning unit is calculated through the operating parameter, and then the operating mode of the air conditioning unit can be finally adjusted to the state with the lowest energy consumption while meeting the stability requirement on the premise of the stability parameter, so that the operating mode of the air conditioning unit can better balance the stability operation and energy consumption, and the problem that the power heat pipe air conditioner cannot effectively guarantee the stable operation while fully reducing the energy consumption in the related art is solved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning control technology, and in particular to a control method and device for a power heat pipe air conditioner. Background Technology

[0002] Powered heat pipe technology with refrigerant pumps has been gradually applied to the field of data center air conditioning, providing a new direction and approach for energy saving in data center variable frequency air conditioning systems. Although powered heat pipes solve the pain point of forced drop installation requirements compared to gravity heat pipes, they still have certain shortcomings in terms of control. Under different cooling demand targets, powered air conditioning units cannot achieve a good balance between ensuring stable operation of the unit and achieving lower energy consumption, which can easily lead to inefficient energy utilization. Summary of the Invention

[0003] The main objective of this invention is to provide a control method and device for a power heat pipe air conditioner, which aims to solve the problem in related technologies of the difficulty in balancing energy consumption and ensuring the stability of unit operation of power air conditioning units.

[0004] In a first aspect, the present invention provides a control method for a power heat pipe air conditioner, which adopts the following technical solution:

[0005] A control method for a power heat pipe air conditioner, comprising:

[0006] Obtain the operating parameters of the refrigerant pump during the operation of the air conditioning unit;

[0007] The stability parameters of the air conditioning unit are obtained based on the operating parameters.

[0008] Based on the stability parameters, the operating mode of the air conditioning unit is adjusted to a mode that satisfies the stability requirements and minimizes energy consumption.

[0009] In some embodiments, when switching the air conditioning unit's operating mode to a preset operating mode that meets stability requirements and has the lowest energy consumption based on the stability parameters, the current operating mode of the air conditioning unit is adjusted to the previous or next operating mode according to the stability parameters and the set switching order; wherein, the energy consumption and indoor temperature control speed of multiple operating modes decrease or increase sequentially according to the set switching order.

[0010] Alternatively, based on the stability parameters and the corresponding rules, the current operating mode of the air conditioning unit can be adjusted to the corresponding operating mode.

[0011] In some embodiments, when switching the air conditioning unit's operating mode to a preset operating mode that meets stability requirements and has the lowest energy consumption based on the stability parameters, the current operating mode of the air conditioning unit is adjusted to the previous or next operating mode according to the stability parameters and the set switching order; wherein, the energy consumption and indoor temperature control speed of multiple operating modes decrease or increase sequentially according to the set switching order.

[0012] Alternatively, based on the stability parameters and the corresponding rules, the current operating mode of the air conditioning unit can be adjusted to the corresponding operating mode.

[0013] In some embodiments, adjusting the operating mode of the air conditioning unit according to the stability parameters to a mode that satisfies both stability requirements and minimizes energy consumption is a step in the process.

[0014] If the operating mode of the air conditioning unit does not meet the stability requirements, immediately switch to the operating mode with faster indoor temperature control.

[0015] If the operating mode of the air conditioning unit meets the stability requirements, the operating mode of the air conditioner will be adjusted at the end of the set testing cycle.

[0016] In some embodiments, the stability parameters are obtained based on the actual pump differential pressure of the refrigerant pump, the set pump differential pressure, and the set pump pressure limit range when the air conditioning unit is running.

[0017] In some embodiments, adjusting the operating mode of the air conditioning unit according to the stability parameters to a mode that satisfies both stability requirements and minimizes energy consumption includes the following steps:

[0018] Based on the actual pump pressure difference and the set pump pressure difference obtained each time within the set detection cycle, the stability value of the current air conditioning unit during operation is obtained;

[0019] Based on the actual pump pressure difference and the pump pressure limit range obtained each time within the set detection cycle, the number of times the actual pump pressure difference exceeds the pump pressure limit range during the operation of the air conditioning unit is calculated.

[0020] If the stability value is higher than the set stability limit, or the number of times the limit is exceeded is higher than the set number of times, the air conditioning unit's operating mode will be immediately switched to an operating mode with a faster indoor temperature control speed.

[0021] If, at the end of the detection cycle, the stability value is lower than the set stability minimum value and the number of times the limit is exceeded is lower than the set number of times the limit is exceeded, the operating mode of the air conditioning unit is switched to a lower energy consumption operating mode.

[0022] In addition, the current operating mode of the air conditioning unit should be maintained at the end of the testing cycle.

[0023] In some embodiments, the air conditioning unit's operating modes include at least a fast response mode, a balanced mode, and an energy-saving mode, wherein the energy consumption of the fast response mode, the balanced mode, and the energy-saving mode decreases sequentially, and the indoor temperature control speed decreases sequentially.

[0024] In some embodiments, when the operating mode of the air conditioning unit is switched to the fast response mode, the air conditioning unit performs the following steps:

[0025] The actual pump pressure difference of the refrigerant pump is adjusted to the set pump pressure difference by adjusting the opening of the bypass valve and the speed of the refrigerant pump. The actual pump pressure difference of the refrigerant pump is adjusted first by adjusting the opening of the bypass valve. If adjusting the opening of the bypass valve cannot achieve the adjustment target of the refrigerant pump, the speed of the refrigerant pump is further adjusted.

[0026] Adjust the bypass valve opening to the set first target opening, and maintain the actual pump pressure difference of the refrigerant at the set pump pressure difference by adjusting the refrigerant pump speed.

[0027] In some embodiments, when the operating mode of the air conditioning unit is switched to balanced mode, the air conditioning unit performs the following steps:

[0028] Gradually close the bypass valve;

[0029] By adjusting the speed of the refrigerant pump, the actual pump pressure difference is adjusted to the set operating pump pressure difference; the operating pump pressure difference is obtained based on the operating high pressure limit and operating low pressure limit of the refrigerant pump.

[0030] In some embodiments, when the air conditioning unit switches its operating mode to energy-saving mode, the air conditioning unit performs the following steps:

[0031] Gradually close the bypass valve;

[0032] By adjusting the speed of the refrigerant pump, the actual pump pressure difference is controlled to the low operating pressure limit of the refrigerant pump.

[0033] Secondly, the present invention also provides a control device for a power heat pipe air conditioner, which adopts the following technical solution:

[0034] A control device for a power heat pipe air conditioner, comprising:

[0035] The acquisition module is configured to acquire the operating parameters of the refrigerant pump when the air conditioning unit is running;

[0036] A calculation module is configured to obtain stability parameters of the air conditioning unit operation based on the operating parameters;

[0037] The adjustment module is configured to adjust the operating mode of the air conditioning unit according to the stability parameters so that the operating mode of the air conditioning unit meets the stability requirements and has the lowest energy consumption.

[0038] The present invention provides a control method and device for a power heat pipe air conditioner, the beneficial effects of which are as follows:

[0039] The control method and device for a power heat pipe air conditioner provided by this invention collects operating parameters during the operation of the air conditioning unit, and further calculates stability parameters that reflect the operating status of the air conditioning unit based on the operating parameters. Then, based on the stability parameters, the operating mode of the air conditioning unit is controlled to adjust to the state with the lowest energy consumption while meeting the stability requirements. This achieves a better balance between stable operation and energy consumption in the operating mode of the air conditioning unit, solving the problem in related technologies where power heat pipe air conditioners cannot effectively ensure stable operation while fully reducing energy consumption. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the hardware structure of the control device for the power heat pipe air conditioner involved in the embodiment of the present invention;

[0041] Figure 2 This is a flowchart illustrating the first embodiment of the control method for a power heat pipe air conditioner according to the present invention;

[0042] Figure 3 This is a schematic diagram of the functional modules of the first embodiment of the control device for the power heat pipe air conditioner of the present invention.

[0043] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0044] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0045] Powered heat pipe technology with refrigerant pumps has been gradually applied to the air conditioning field of data center computer rooms, providing new directions and ideas for energy saving in data center variable frequency air conditioning systems. Although powered heat pipes solve the pain point of forced drop installation requirements compared to gravity heat pipes, they still have certain shortcomings in control. Under different cooling demand targets, powered air conditioning units cannot achieve a good balance between ensuring stable operation of the unit and achieving lower energy consumption, which can easily lead to inefficient energy utilization. Therefore, this invention provides a control method and device for powered heat pipe air conditioning.

[0046] The present invention provides a control method and device for a power heat pipe air conditioner. The key point of the invention is that by collecting operating parameters during the operation of the air conditioning unit, and further calculating stability parameters that reflect the operating status of the air conditioning unit based on the operating parameters, the operating mode of the air conditioning unit can be controlled to adjust to the state of lowest energy consumption while meeting stability requirements. This achieves a better balance between stable operation and energy consumption in the operating mode of the air conditioning unit, solving the problem in related technologies where power heat pipe air conditioners cannot effectively ensure stable operation while fully reducing energy consumption.

[0047] In a first aspect, embodiments of the present invention provide a control device for a power heat pipe air conditioner, which may be a device with data processing capabilities such as a personal computer (PC), a laptop computer, or a server.

[0048] Reference Figure 1 , Figure 1 This is a schematic diagram of the hardware structure of the control device for a power heat pipe air conditioner according to an embodiment of the present invention. In this embodiment, the control device for the power heat pipe air conditioner may include a processor 1001 (e.g., a Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to realize communication between these components; the user interface 1003 may include a display screen or an input unit such as a keyboard; the network interface 1004 may optionally include a standard wired interface or a wireless interface (e.g., Wireless Fidelity, Wi-Fi); the memory 1005 may be high-speed random access memory (RAM) or stable memory (non-volatile memory), such as a disk storage device. The memory 1005 may also optionally be a storage device independent of the aforementioned processor 1001. Those skilled in the art will understand that… Figure 1 The hardware structure shown does not constitute a limitation of the invention and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0049] Continue to refer to Figure 1 , Figure 1The memory 1005, which serves as a computer storage medium, may include an operating system, a network communication module, a user interface module, and a control program for a power heat pipe air conditioner. The processor 1001 can call the control program for the power heat pipe air conditioner stored in the memory 1005 and execute the control method for the power heat pipe air conditioner provided in this embodiment of the invention.

[0050] Secondly, embodiments of the present invention provide a control method for a power heat pipe air conditioner.

[0051] Reference Figure 2 A control method for a power heat pipe air conditioner, comprising:

[0052] S100: Obtain the operating parameters of the refrigerant pump during the operation of the air conditioning unit;

[0053] S200. Obtain the stability parameters of the air conditioning unit based on the operating parameters.

[0054] S300. Based on the stability parameters, adjust the operating mode of the air conditioning unit to a mode that satisfies the stability requirements and minimizes energy consumption.

[0055] This setup collects operating parameters during the operation of the air conditioning unit, and then calculates stability parameters that reflect the operating status of the air conditioning unit. Based on these stability parameters, the system can control the operating mode of the air conditioning unit to achieve the lowest energy consumption while meeting stability requirements. This allows the operating mode of the air conditioning unit to better balance stable operation and energy consumption, solving the problem in related technologies where power heat pipe air conditioners cannot effectively ensure stable operation while significantly reducing energy consumption.

[0056] Furthermore, in step S300, according to the stability parameters, the operating mode of the air conditioning unit is switched to a preset operating mode that meets the stability requirements and has the lowest energy consumption. According to the stability parameters and the set switching order, the current operating mode of the air conditioning unit is adjusted to the previous or next operating mode. Among them, the energy consumption and indoor temperature control speed of multiple operating modes are sequentially reduced or increased or decreased according to the set switching order.

[0057] Alternatively, based on the stability parameters and the corresponding rules, the current operating mode of the air conditioning unit can be adjusted to the corresponding operating mode.

[0058] Specifically, in some embodiments, the air conditioning unit switches operating modes according to a set switching sequence, which allows the indoor temperature control speed and energy consumption of the air conditioning unit to be adjusted gradually. This effectively reduces the possibility of damage to related components in the air conditioning unit when the adjustment difference is too large, which is conducive to the overall stable operation of the air conditioning unit and ultimately achieves the lowest possible energy consumption while meeting stability requirements.

[0059] In other embodiments, the air conditioning unit switches operating modes according to set rules. That is, the operating mode is adjusted according to the different stability parameters of the air conditioning unit. When this solution is adopted, the air conditioning unit can be quickly switched to the target operating mode. For example, if the air conditioning unit cannot meet the temperature target and cannot operate stably, it can be directly switched to the operating mode with a faster indoor temperature control speed, thereby achieving the effect of quickly stabilizing the air conditioning unit.

[0060] Furthermore, in some preferred embodiments, step S300, adjusting the operating mode of the air conditioning unit according to the stability parameters, so that the operating mode of the air conditioning unit satisfies the stability requirements and has the lowest energy consumption,

[0061] If the operating mode of the air conditioning unit does not meet the stability requirements, immediately switch to the operating mode with faster indoor temperature control.

[0062] If the operating mode of the air conditioning unit meets the stability requirements, the operating mode of the air conditioner will be adjusted at the end of the set testing cycle.

[0063] This configuration allows for immediate switching of the air conditioning unit's operating mode when the current mode does not meet stability requirements, thus preventing the unit from operating in an unstable state for extended periods and effectively ensuring its operational safety. Simultaneously, when stability requirements are met, the system assesses whether the unit remains stable within a set monitoring period. This improves the accuracy of stability assessment when switching to a lower-energy-consumption mode, facilitating subsequent stable attempts to switch to the lower-energy-consumption operating mode.

[0064] In addition, in other embodiments, the operating mode of the air conditioning unit can be uniformly set to switch immediately or switch after a set period of judgment, and this application does not impose any restrictions here.

[0065] Furthermore, in some preferred embodiments, the stability parameters are obtained based on the actual pump pressure difference of the refrigerant pump, the set pump pressure difference, and the set pump pressure limit range during the operation of the air conditioning unit.

[0066] This setup is advantageous because both excessively high and low actual pump pressure differentials of the refrigerant can negatively impact the pump. By selecting the actual pump pressure differential of the refrigerant to calculate the stability parameter of the air conditioning unit, the operational stability of the air conditioning unit can be quickly assessed when the actual pump pressure differential changes. Compared to frequency control or temperature control, this approach is more conducive to controlling the reliability of pump operation.

[0067] Specifically, step S300, adjusting the operating mode of the air conditioning unit according to the stability parameters to a mode that satisfies stability requirements while minimizing energy consumption, includes the following steps:

[0068] S310. Based on the actual pump pressure difference and the set pump pressure difference obtained each time within the set detection cycle, obtain the stability value of the current air conditioning unit during operation.

[0069] S320. Based on the actual pump pressure difference and the pump pressure limit range obtained each time within the set detection cycle, calculate the number of times the actual pump pressure difference exceeds the pump pressure limit range during the operation of the air conditioning unit.

[0070] S330. If the stability value is higher than the set stability limit, or the number of times the limit is exceeded is higher than the set number of times, immediately switch the air conditioning unit to the operating mode with a faster indoor temperature control speed.

[0071] S340. If, at the end of the detection cycle, the stability value is lower than the set stability minimum value and the number of times the limit is exceeded is lower than the set number of times the limit is exceeded, the operating mode of the air conditioning unit is switched to a lower energy consumption operating mode.

[0072] S350. In addition, at the end of the inspection cycle, the current operating mode of the air conditioning unit shall be maintained.

[0073] This setup allows for calculations across two dimensions using the actual pump pressure difference, assessing the stability of the air conditioning unit during operation. If either dimension is deemed unstable, the operating mode is switched to one with faster indoor temperature control. If both dimensions meet high stability requirements throughout the entire testing cycle (i.e., the stability value in S340 is below the set minimum stability limit, and the number of exceedances is below the set minimum number of exceedances), then the operating mode adequately meets the current temperature target of the air conditioning unit and has sufficient capacity, allowing it to be switched to a lower energy consumption mode. When both dimensions meet the basic stability requirements (step S350), the air conditioning unit's stability is considered adequate. Switching to a lower energy consumption mode would fail to meet the basic stability requirements, while switching to a faster indoor temperature control mode would result in higher energy consumption. Therefore, the current operating mode is determined to have the lowest energy consumption while meeting the basic stability requirements, and the current operating mode of the air conditioning unit is maintained.

[0074] Specifically, the stability value calculation strategy is as follows: Within the set detection cycle range tn, at preset fixed detection intervals t0, the actual pump pressure difference value Ps is read, resulting in a parameter set A = (Ps1, Ps2, Ps3....Psi...Psn) based on a time vector. Calculations are then performed, and based on the function F(x), the deviation between the detected pump pressure difference value and the set pump pressure difference P0 value after each detection is calculated. The function can be based on a commonly used root mean square error function or its improved formula; for example, the standard root mean square error function is used in this embodiment. The final formula for calculating the stability value is:

[0075]

[0076] A set of function values, B = (F(1), F(2), ..., F(x), ..., F(n)), is obtained. Comparing this set of function values ​​with the lower stability limit Sta1 and the higher stability limit Sta2, if F(n) < Sta1, the system meets the high stability requirement; if Sta1 ≤ F(n) ≤ Sta2, the system meets the basic stability requirement; and if F(x) > Sta2, the system does not meet the basic stability requirement. Furthermore, within time tn, if the x-th calculation of the function F(x) is detected to be greater than Sta2, it can be determined in advance that the system does not meet the basic stability requirement.

[0077] The two constant values, Sta1 and Sta2, can be initially determined based on the unit parameters and simulated load, and will be synchronously optimized and updated based on long-term operation and learning of the unit.

[0078] The strategy for calculating the number of times the limit is exceeded is as follows: the value of the number of times the limit is exceeded is derived from the number of times Ps exceeds the refrigerant pump limit values ​​Ph1 and Pl1.

[0079] Expressed as a function N(x), the specific calculation is as follows: the initial value N(0) = 0. Then, each time the system pressure difference value Ps is detected, it is determined whether Pl1 ≤ Ps ≤ Ph1. If not, then N(x) = N(x-1); if so, then N(x) = N(x-1) + 1. Based on the above, a set of function values ​​C = (N(1), N(2), ... N(x), ... N(n)) is formed.

[0080] Wherein, Pl1 is the pump's low-pressure limit; when the pump's differential pressure is below this value, the bypass valve needs to be adjusted to increase the differential pressure. Ph1 is the pump's high-pressure limit; when the pump's differential pressure exceeds this value, the bypass valve needs to be adjusted to decrease the differential pressure. The corresponding refrigerant pump also has a low-pressure protection value Pl2; when the pump's differential pressure is below this value, the pump stops; and a high-pressure protection value Ph2; when the pump's differential pressure exceeds this value, the pump stops.

[0081] Similarly, comparing the set of function values ​​C with the lower limit of degree Qak1 and the higher limit of degree Qak2, when N(n) < Qak1, the high stability requirement is met; when Qak1 ≤ N(n) ≤ Qak2, the basic stability requirement is met; and when N(x) > Qak2, the basic stability requirement is not met. Note that within time tn, as soon as the x-th calculation of the function N(x) > Qak2 is detected, it can be determined in advance that the basic stability requirement is not met.

[0082] The initial values ​​of the two constants, Qak1 and Qak2, can be determined based on the unit parameters and simulated load, and then synchronously optimized and updated based on the long-term operation and learning of the unit.

[0083] Furthermore, in some preferred embodiments, the operating modes of the air conditioning unit include at least a fast response mode, a balanced mode, and an energy-saving mode, wherein the energy consumption of the fast response mode, the balanced mode, and the energy-saving mode decreases sequentially, and the indoor temperature control speed decreases sequentially.

[0084] With this configuration, the air conditioning unit has at least three operating modes, allowing it to choose the most suitable mode from low energy consumption, balanced, and high stability modes based on stability requirements. This avoids the either-or approach of having only two modes, which would lead to high energy consumption.

[0085] Furthermore, in some preferred embodiments, when the operating mode of the air conditioning unit is switched to the fast response mode, the air conditioning unit performs the following steps:

[0086] Step 1: Adjust the actual pump pressure difference of the refrigerant pump to the set pump pressure difference by adjusting the bypass valve opening and the refrigerant pump speed. The actual pump pressure difference of the refrigerant pump is adjusted by adjusting the bypass valve opening first. If adjusting the bypass valve opening cannot achieve the adjustment target of the refrigerant pump, the refrigerant pump speed is further adjusted.

[0087] Step 2: Adjust the bypass valve opening to the set first target opening, and maintain the actual pump pressure difference of the refrigerant at the set pump pressure difference by adjusting the refrigerant pump speed.

[0088] In rapid response mode, the system achieves rapid response to system load changes by setting reasonable actual pump differential pressure and prioritizing the bypass valve, thereby improving system reliability and response speed, effectively controlling the computer room temperature, and enhancing temperature control stability.

[0089] Specifically, when fluctuations in the computer room load cause the refrigerant pump's current differential pressure to be too low or too high, in order to maintain the actual pump differential pressure at the set pump differential pressure P0, the bypass valve responds first, closing / opening the valve opening at a rate SpByV1. If the target actual pump differential pressure is still not met after the bypass valve is closed / fully opened, the refrigerant pump speed is increased / decreased to bring the actual pump differential pressure to P0, thus completing step 1. After step 1 is completed, to avoid frequent system operations, the system differential pressure maintenance duration Tp0 needs to be checked before step 2 can be executed.

[0090] The bypass valve opening stepT resets to the target opening step0, and the PID controller simultaneously adjusts the pump speed, that is, it adjusts the actual pump pressure difference of the refrigerant pump according to the speed of the refrigerant pump. Specifically, if the current opening stepT is greater than / less than the target opening step0, the bypass valve adjusts to the target opening step0 at a fixed rate SpByV2, while the system resistance increases / decreases, causing the actual pump pressure difference of the pump to be higher / lower. The refrigerant pump then adjusts the pressure difference through PID control to bring the pump back to the set pump pressure difference P0. If a change in terminal cooling demand is detected during the execution of step 2, step 2 is stopped, and step 1 is re-executed, and this cycle continues.

[0091] Wherein, SpByV1 is the bypass valve adjustment rate 1, which is adjustable according to the actual system conditions, for example, the range is from 1.0% / s to 10.0% / s; SpByV2 is the bypass valve adjustment rate 2, which is adjustable according to the actual system conditions, for example, the range is from 0.1% / s to 1.0% / s; Step0 is the initial opening percentage of the bypass valve, for example, it can be 50%.

[0092] In rapid response mode, when the load in the computer room fluctuates frequently and drastically, the terminal fans and EEV adjust frequently, leading to rapid changes in the system's refrigerant flow. The system's built-in bypass valve responds quickly to compensate for the slow response of the refrigerant pump, rapidly adjusting the refrigerant flow to meet load changes and achieve sustainable rapid response control. Then, during periods of stable system load, the bypass valve's self-resetting opening guides the refrigerant pump to adjust to a suitable speed. Due to the relatively low SpByV2 rate, the bypass valve's opening adjustment is relatively slow, ensuring steady adjustment of the refrigerant pump.

[0093] When the air conditioning unit switches to balanced mode, the following steps are performed:

[0094] Step 1: Gradually close the bypass valve;

[0095] Step 2: Adjust the actual pump pressure difference to the set operating pump pressure difference by adjusting the speed of the refrigerant pump; the operating pump pressure difference is obtained based on the operating high pressure limit and operating low pressure limit of the refrigerant pump.

[0096] In balanced mode, the system closes the bypass valve to reduce ineffective flow, sets a reasonable differential pressure, and ensures reliable pump operation, thus maintaining a reasonable balance between energy saving and reliability. Therefore, balanced mode is suitable for operating conditions with moderate load fluctuations in the computer room, i.e., operating conditions that meet the basic stability requirements of the air conditioning unit.

[0097] Specifically, after entering the balance mode, the bypass valve performs the valve closing action at a fixed rate SpByV1 until it is completely closed and then stops operating.

[0098] The refrigerant pump speed is controlled by differential pressure PID, and the target differential pressure value is set according to Pavg (based on the values ​​of Pl1 and Ph1, for example, Pavg = (Pl1 + Ph1) / 2).

[0099] The opening degree of the two-way water valve on the cold water side is correlated with the inlet and outlet water temperature difference control, and PID adjustment is performed based on the ratio of the setpoint to the actual temperature difference. The terminal EEV is adjusted using PID based on the terminal evaporator outlet superheat Teh and the setpoint Teh0. The terminal fan speed is adjusted using PID based on the temperature requirement calculated from the detected unit supply air temperature Ts / return air temperature Th and the target value Ts0 / Th0. Regarding the control of the water valves, terminal EEV, and fans, since it does not affect the control mode of the key points of this invention, different control schemes can be set in different embodiments according to the need for operational stability, and no restrictions are imposed here.

[0100] When the environmental load in the computer room fluctuates, it will affect the terminal temperature demand, which in turn affects the terminal fan speed, refrigerant flow rate, and EEV opening, resulting in changes in the pressure difference across the pump. The refrigerant pump adjusts by detecting the difference between the current actual pump pressure difference and the set pump pressure difference P0. Since P0 is the median value of the long-term allowable pressure difference range for the refrigerant pump, the adjustable range of pump pressure difference fluctuations is the largest, thus allowing for a certain degree of fluctuation in the environmental load.

[0101] When the air conditioning unit switches to energy-saving mode, the following steps are performed:

[0102] Step 1: Gradually close the bypass valve;

[0103] Step 2: By adjusting the speed of the refrigerant pump, control the actual pump pressure difference to the low operating pressure limit of the refrigerant pump.

[0104] In energy-saving mode, the system reduces ineffective flow by closing the bypass valve, sets a low system pressure differential, and minimizes pump operating speed, thereby reducing system energy consumption and PUE. Therefore, energy-saving mode is suitable for operating conditions with small load fluctuations in the computer room, i.e., conditions that meet high stability requirements.

[0105] Specifically, after entering the energy-saving mode, the bypass valve performs the valve closing action at a fixed rate of SpByV1 until it is completely closed and then stops operating.

[0106] The refrigerant pump speed is controlled by differential pressure PID, and the target differential pressure value is set according to Pl1.

[0107] The adjustment methods for the two-way water valve, terminal EEV, and fan on the cold water side remain unchanged.

[0108] Fluctuations in the computer room's environmental load will affect the terminal temperature demand, which in turn affects the terminal fan speed, refrigerant flow rate, and EEV opening, leading to changes in the pressure difference across the pump. When the environmental load fluctuation is small, the pump pressure difference fluctuation is minimal in energy-saving mode, ensuring the reliability of the refrigerant pump operation. However, if the load changes drastically, the refrigerant pump, being set to operate at a low pressure difference, may experience overshoot, easily triggering the system's low pump pressure difference alarm. In this case, the system will automatically switch operating modes according to the mode switching control logic.

[0109] Thirdly, embodiments of the present invention also provide a control device for a power heat pipe air conditioner.

[0110] Reference Figure 3 A schematic diagram of the functional modules of the control device for a power heat pipe air conditioner in the first embodiment.

[0111] In this embodiment, the control device of the power heat pipe air conditioner includes:

[0112] The acquisition module is configured to acquire the operating parameters of the refrigerant pump when the air conditioning unit is running;

[0113] A calculation module is configured to obtain stability parameters of the air conditioning unit operation based on the operating parameters;

[0114] The adjustment module is configured to adjust the operating mode of the air conditioning unit according to the stability parameters so that the operating mode of the air conditioning unit meets the stability requirements and has the lowest energy consumption.

[0115] The functions of each module in the control device of the above-mentioned power heat pipe air conditioner correspond to the steps in the control method embodiment of the above-mentioned power heat pipe air conditioner, and their functions and implementation processes will not be described in detail here.

[0116] Fourthly, embodiments of the present invention also provide a readable storage medium.

[0117] The present invention provides a readable storage medium storing a control program for a power heat pipe air conditioner, wherein when the control program for the power heat pipe air conditioner is executed by a processor, the steps of the control method for the power heat pipe air conditioner as described above are implemented.

[0118] The method implemented when the control program of the power heat pipe air conditioner is executed can be referred to in various embodiments of the control method of the power heat pipe air conditioner of the present invention, and will not be repeated here.

[0119] Fifthly, embodiments of the present invention also provide an air conditioning system.

[0120] An air conditioning system includes a control device for a power heat pipe air conditioner as described above, for performing the control method for the power heat pipe air conditioner as described above.

[0121] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0122] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0123] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of the present invention.

[0124] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A control method for a power heat pipe air conditioner, characterized in that, It includes: Obtain the operating parameters of the refrigerant pump during the operation of the air conditioning unit; The stability parameters of the air conditioning unit are obtained based on the operating parameters. Based on the stability parameters, adjust the operating mode of the air conditioning unit to a mode that satisfies the stability requirements and minimizes energy consumption; The stability parameters are obtained based on the actual pump pressure difference of the refrigerant pump, the set pump pressure difference, and the set pump pressure limit range when the air conditioning unit is running. The step of adjusting the operating mode of the air conditioning unit according to the stability parameters to a mode that satisfies both stability requirements and minimizes energy consumption includes the following steps: Based on the actual pump pressure difference and the set pump pressure difference obtained each time within the set detection cycle, the stability value of the current air conditioning unit during operation is obtained; Based on the actual pump pressure difference and the pump pressure limit range obtained each time within the set detection cycle, the number of times the actual pump pressure difference exceeds the pump pressure limit range during the operation of the air conditioning unit is calculated. If the stability value is higher than the set stability limit, or the number of times the limit is exceeded is higher than the set number of times, the air conditioning unit's operating mode will be immediately switched to an operating mode with a faster indoor temperature control speed. If, at the end of the detection cycle, the stability value is lower than the set stability minimum value and the number of times the limit is exceeded is lower than the set number of times the limit is exceeded, the operating mode of the air conditioning unit is switched to a lower energy consumption operating mode. or If, at the end of the detection cycle, the stability value is between the lower and upper stability limits, and the number of exceedances is between the lower and upper limits, the current operating mode of the air conditioning unit shall be maintained.

2. The control method for a power heat pipe air conditioner as described in claim 1, characterized in that, In the process of switching the air conditioning unit's operating mode to a preset operating mode that meets stability requirements and has the lowest energy consumption based on the stability parameters, the current operating mode of the air conditioning unit is adjusted to the previous or next operating mode according to the stability parameters and the set switching sequence; wherein, the energy consumption and indoor temperature control speed of multiple operating modes are arranged according to the set switching sequence, with energy consumption decreasing sequentially with the switching sequence, and indoor temperature control speed increasing or decreasing sequentially with the switching sequence. Alternatively, based on the stability parameters and the corresponding rules, the current operating mode of the air conditioning unit can be adjusted to the corresponding operating mode.

3. The control method for a power heat pipe air conditioner as described in claim 1, characterized in that, Based on the stability parameters, the operating mode of the air conditioning unit is adjusted to a mode that satisfies both stability requirements and minimizes energy consumption. If the operating mode of the air conditioning unit does not meet the stability requirements, immediately switch to the operating mode with faster indoor temperature control. If the operating mode of the air conditioning unit meets the stability requirements, the operating mode of the air conditioner will be adjusted at the end of the set testing cycle.

4. The control method for a power heat pipe air conditioner as described in claim 1, characterized in that, The operating modes of the air conditioning unit include at least a fast response mode, a balanced mode, and an energy-saving mode, wherein the energy consumption of the fast response mode, the balanced mode, and the energy-saving mode decreases in that order, and the indoor temperature control speed decreases in that order.

5. The control method for a power heat pipe air conditioner as described in claim 4, characterized in that, When the air conditioning unit switches to the fast response mode, the air conditioning unit performs the following steps: The actual pump pressure difference of the refrigerant pump is adjusted to the set pump pressure difference by adjusting the opening of the bypass valve and the speed of the refrigerant pump. The actual pump pressure difference of the refrigerant pump is adjusted first by adjusting the opening of the bypass valve. If adjusting the opening of the bypass valve cannot achieve the adjustment target of the refrigerant pump, the speed of the refrigerant pump is further adjusted. Adjust the bypass valve opening to the set first target opening, and maintain the actual pump pressure difference of the refrigerant at the set pump pressure difference by adjusting the refrigerant pump speed.

6. The control method for a power heat pipe air conditioner as described in claim 4, characterized in that, When the air conditioning unit switches to balanced mode, the following steps are performed: Gradually close the bypass valve; By adjusting the speed of the refrigerant pump, the actual pump pressure difference is adjusted to the set operating pump pressure difference; the operating pump pressure difference is obtained based on the operating high pressure limit and operating low pressure limit of the refrigerant pump.

7. The control method for a power heat pipe air conditioner as described in claim 4, characterized in that, When the air conditioning unit switches to energy-saving mode, the following steps are performed: Gradually close the bypass valve; By adjusting the speed of the refrigerant pump, the actual pump pressure difference is controlled to the low operating pressure limit of the refrigerant pump.

8. A control device for a power heat pipe air conditioner, characterized in that, It includes: The acquisition module is configured to acquire the operating parameters of the refrigerant pump when the air conditioning unit is running; A calculation module is configured to obtain stability parameters of the air conditioning unit operation based on the operating parameters; The adjustment module is configured to adjust the operating mode of the air conditioning unit according to the stability parameters so that the operating mode of the air conditioning unit meets the stability requirements and has the lowest energy consumption. The stability parameters are obtained based on the actual pump pressure difference of the refrigerant pump, the set pump pressure difference, and the set pump pressure limit range when the air conditioning unit is running. The step of adjusting the operating mode of the air conditioning unit according to the stability parameters to a mode that satisfies both stability requirements and minimizes energy consumption includes the following steps: Based on the actual pump pressure difference and the set pump pressure difference obtained each time within the set detection cycle, the stability value of the current air conditioning unit during operation is obtained; Based on the actual pump pressure difference and the pump pressure limit range obtained each time within the set detection cycle, the number of times the actual pump pressure difference exceeds the pump pressure limit range during the operation of the air conditioning unit is calculated. If the stability value is higher than the set stability limit, or the number of times the limit is exceeded is higher than the set number of times, the air conditioning unit's operating mode will be immediately switched to an operating mode with a faster indoor temperature control speed. If, at the end of the detection cycle, the stability value is lower than the set stability minimum value and the number of times the limit is exceeded is lower than the set number of times the limit is exceeded, the operating mode of the air conditioning unit is switched to a lower energy consumption operating mode. or If, at the end of the detection cycle, the stability value is between the lower and upper stability limits, and the number of exceedances is between the lower and upper limits, the current operating mode of the air conditioning unit shall be maintained.

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