Failure detection method, system and device of phase change energy storage module, medium and equipment

Abstract

The invention discloses a phase change energy storage module failure detection method, system and device, a medium and equipment, and the method comprises the steps: monitoring a failure detection reference temperature of a phase change material when a phase change energy storage module is in a non-heat storage mode, and determining a temperature rise inflection point based on the failure detection reference temperature; determining a theoretical supercooling degree of the phase change material according to the temperature rise inflection point and the phase change temperature, determining a temperature drop inflection point based on the monitored failure detection reference temperature, determining an actual supercooling degree of the phase change material according to the temperature drop inflection point and the temperature rise inflection point, and determining a ratio of the actual supercooling degree to the theoretical supercooling degree; according to the method, the failure of the phase change energy storage module can be detected, the failure condition of the phase change energy storage module can be found in time, stable operation of a heating and ventilation system corresponding to the phase change energy storage module is kept, and losses caused by faults of the phase change energy storage module are reduced.

Description

Technical Field

[0001] This application relates to the field of HVAC technology, specifically to a failure detection method, apparatus, storage medium, and equipment for a phase change energy storage module. Background Technology

[0002] A phase change energy storage module is a device that uses phase change materials (PCMs) to store and release energy. It absorbs or releases a large amount of latent heat through the phase change process of the PCM (such as from solid to liquid or vice versa) when the ambient temperature changes, thereby achieving energy storage and supply. For example, a phase change energy storage module can use the absorption / release characteristics of PCMs to heat tap water to provide people with comfortable domestic hot water.

[0003] However, when the phase change material fails, the phase change energy storage module will also fail, making it unable to maintain the temperature of the supplied hot water. Therefore, how to detect whether the phase change energy storage module has failed becomes a problem. Summary of the Invention

[0004] This application provides a method, apparatus, storage medium, and HVAC equipment for detecting the failure of a phase change energy storage module, which can detect the failure of the phase change energy storage module.

[0005] In a first aspect, embodiments of this application provide a failure detection method for a phase change energy storage module, comprising:

[0006] When the phase change energy storage module is in non-heat storage mode, the failure detection reference temperature of the phase change material in the phase change energy storage module is monitored based on a preset detection cycle. The failure detection reference temperature is the temperature detected in the region corresponding to the lowest temperature gradient in the temperature gradient formed in the charging flow path direction within the phase change energy storage module.

[0007] Based on the multiple failure detection reference temperatures monitored above, the temperature rise inflection point is determined, and the theoretical undercooling of the phase change material is determined based on the temperature rise inflection point and the phase change temperature of the phase change material.

[0008] Based on the multiple failure detection reference temperatures monitored above, the temperature drop inflection point is determined, and the actual undercooling of the phase change material is determined based on the temperature drop inflection point and the temperature rise inflection point.

[0009] The ratio between the actual subcooling and the theoretical subcooling is determined. If the ratio is less than a preset ratio, the phase change energy storage module is determined to be faulty.

[0010] In one possible implementation, the determination of the temperature rise inflection point based on multiple monitored failure detection reference temperatures, and the determination of the theoretical undercooling of the phase change material based on the temperature rise inflection point and the phase change temperature of the phase change material, includes:

[0011] If, in two adjacent failure detection reference temperatures monitored, the first failure detection reference temperature at the previous moment is lower than the second failure detection reference temperature at the next moment, the second failure detection reference temperature is determined to be the temperature rise inflection point.

[0012] The theoretical undercooling is determined based on the first failure detection reference temperature and the phase transition temperature.

[0013] In one possible implementation, determining the theoretical undercooling based on the first failure detection reference temperature and the phase transition temperature includes:

[0014] Calculate the first difference between the phase transition temperature and the first failure detection reference temperature;

[0015] The first difference mentioned above is taken as the theoretical supercooling.

[0016] In one possible implementation, the determination of the temperature drop inflection point based on multiple monitored failure detection reference temperatures, and the determination of the actual undercooling of the phase change material based on the temperature drop inflection point and the temperature rise inflection point, includes:

[0017] If, in two adjacent failure detection reference temperatures monitored, the third failure detection temperature at the previous moment is greater than the fourth failure detection reference temperature at the next moment, the fourth failure detection reference temperature is determined to be the temperature drop inflection point.

[0018] The actual subcooling is determined based on the third failure detection reference temperature and the first failure detection reference temperature.

[0019] In one possible implementation, determining the actual undercooling based on the third failure detection reference temperature and the first failure detection reference temperature includes:

[0020] Calculate the second difference between the third failure detection reference temperature and the first failure detection reference temperature mentioned above;

[0021] The second difference mentioned above is taken as the actual subcooling.

[0022] In one possible implementation, when the phase change energy storage module is in non-thermal storage mode, monitoring the failure detection reference temperature of the phase change material in the phase change energy storage module based on a preset detection cycle includes:

[0023] When the aforementioned phase change energy storage module enters standby or heat release mode, the failure detection reference temperature of the phase change material in the aforementioned phase change energy storage module is monitored based on a preset detection cycle.

[0024] In one possible implementation, the phase change energy storage module is provided with multiple temperature sensors, which are arranged sequentially and at intervals according to the direction of the charging flow path. These temperature sensors are used to detect the temperature of the phase change material. The monitoring of the failure detection reference temperature of the phase change material in the phase change energy storage module based on a preset detection cycle includes:

[0025] The temperature sensor installed at the region corresponding to the lowest temperature gradient formed in the charging flow path direction within the phase change energy storage module is identified as the target temperature sensor.

[0026] The temperature detected by the aforementioned target temperature sensor is taken as the target temperature, and the aforementioned failure detection reference temperature is determined based on the aforementioned target temperature.

[0027] In one possible implementation, determining the failure detection reference temperature based on the target temperature includes:

[0028] Obtain the average value of the target temperatures mentioned above;

[0029] The above average value is used as the reference temperature for the failure detection.

[0030] In one possible implementation, determining the failure detection reference temperature based on the target temperature includes:

[0031] Determine the lowest temperature among the target temperatures mentioned above;

[0032] The aforementioned lowest temperature is used as the reference temperature for the aforementioned failure detection.

[0033] In one possible implementation, the temperature sensor installed at the region corresponding to the lowest temperature gradient among the temperature gradients formed in the charging flow path direction within the phase change energy storage module is used as the target temperature sensor, including:

[0034] Obtain multiple temperature values ​​detected by the aforementioned multiple temperature sensors;

[0035] Based on the magnitude of the above multiple temperature values, the temperature distribution is divided to obtain multiple temperature gradients;

[0036] The temperature sensor installed in the region corresponding to the lowest temperature gradient among the above multiple temperature gradients is used as the target temperature sensor.

[0037] In one possible implementation, the phase change energy storage module is connected to a heat source unit, which provides heat to the phase change energy storage module. Determining that the phase change energy storage module has failed when the ratio is less than a preset ratio includes:

[0038] The lowest effective heating temperature at which the heat source unit provides heat to the phase change energy storage module is obtained.

[0039] The average heat exchanger temperature difference between the phase change material and the cold water in the phase change energy storage module, as well as the phase change temperature of the phase change material, are obtained.

[0040] The subcooling anomaly temperature threshold is determined based on the minimum effective heating temperature, the average heat exchanger temperature difference, and the phase change temperature.

[0041] When the ratio is less than the preset ratio and the theoretical supercooling is greater than the supercooling abnormal temperature threshold, the phase change energy storage module is determined to be faulty.

[0042] In one possible implementation, determining the subcooling anomaly temperature threshold based on the minimum effective heating temperature, the average heat exchanger temperature difference, and the phase change temperature includes:

[0043] Calculate the minimum effective heating temperature and the average heat exchange temperature difference mentioned above.

[0044] Determine the target difference between the phase transition temperature and the sum of the temperatures, and use the target difference as the threshold for the supercooling anomaly temperature.

[0045] Secondly, embodiments of this application also provide a heating, ventilation, and air conditioning system, including:

[0046] A heat source unit, wherein the heat source unit includes a controller;

[0047] A phase change energy storage module, which is connected to the heat source unit.

[0048] The controller mentioned above is used for:

[0049] When the phase change energy storage module is in non-heat storage mode, the failure detection reference temperature of the phase change material in the phase change energy storage module is monitored based on a preset detection cycle. The failure detection reference temperature is the temperature detected in the region corresponding to the lowest temperature gradient in the temperature gradient formed in the charging flow path direction within the phase change energy storage module.

[0050] Based on the multiple failure detection reference temperatures monitored above, the temperature rise inflection point is determined, and the theoretical undercooling of the phase change material is determined based on the temperature rise inflection point and the phase change temperature of the phase change material.

[0051] Based on the multiple failure detection reference temperatures monitored above, the temperature drop inflection point is determined, and the actual undercooling of the phase change material is determined based on the temperature drop inflection point and the temperature rise inflection point.

[0052] The ratio between the actual subcooling and the theoretical subcooling is determined. If the ratio is less than a preset ratio, the phase change energy storage module is determined to be faulty.

[0053] Thirdly, embodiments of this application also provide a computer-readable storage medium storing a computer program thereon, which, when run on a computer, causes the computer to execute a failure detection method for a phase change energy storage module as provided in any embodiment of this application.

[0054] Fourthly, embodiments of this application also provide a heating, ventilation, and air conditioning (HVAC) device, including a processor and a memory, wherein the memory has a computer program, and the processor executes a failure detection method for a phase change energy storage module as provided in any embodiment of this application by calling the computer program.

[0055] The technical solution provided in this application, when the phase change energy storage module is in non-heat storage mode, monitors the failure detection reference temperature of the phase change material in the phase change energy storage module based on a preset detection cycle. The failure detection reference temperature is the temperature detected in the region corresponding to the lowest temperature gradient in the temperature gradient formed in the energy flow path direction within the phase change energy storage module. Based on the monitored multiple failure detection reference temperatures, a temperature rise inflection point is determined, and the theoretical supercooling of the phase change material is determined based on the temperature rise inflection point and the phase change temperature of the phase change material. Based on the monitored multiple failure detection reference temperatures, a temperature fall inflection point is determined, and the actual supercooling of the phase change material is determined based on the temperature fall inflection point and the temperature rise inflection point. The ratio between the actual supercooling and the theoretical supercooling is determined. When the ratio is less than a preset ratio, the phase change energy storage module is determined to be faulty. In this way, this application can detect whether the phase change energy storage module is faulty through the above method, and can promptly detect the failure of the phase change energy storage module, so as to solve the failure problem in a timely manner, maintain the stable operation of the HVAC system corresponding to the phase change energy storage module, and reduce the losses caused by the failure of the phase change energy storage module. Attached Figure Description

[0056] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0057] Figure 1 A schematic diagram of the structure of an HVAC system provided for the failure detection method of the phase change energy storage module provided in the embodiments of this application.

[0058] Figure 2 This is a schematic diagram of the first process of the failure detection method for phase change energy storage modules provided in the embodiments of this application.

[0059] Figure 3 This is a schematic diagram of the temperature change of the phase change material during the solidification and exothermic stage, provided for the failure detection method of the phase change energy storage module in the embodiments of this application.

[0060] Figure 4 This is a schematic diagram of a second process for a failure detection method for a phase change energy storage module provided in an embodiment of this application.

[0061] Figure 5 This is a schematic diagram of a third process in a practical application scenario for the failure detection method of the phase change energy storage module provided in the embodiments of this application.

[0062] Figure 6 This is a schematic diagram of a first structure of a heating, ventilation, and air conditioning (HVAC) device provided in an embodiment of this application.

[0063] Figure 7 This is a schematic diagram of a second structure of the HVAC equipment provided in an embodiment of this application. Detailed Implementation

[0064] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0065] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0066] A phase change energy storage module is a technology that utilizes the property of phase change materials (PCMs) to absorb or release large amounts of heat during a phase change process to store and release energy. Within a specific temperature range, PCMs can transform from one physical state to another (such as from solid to liquid, or from liquid to solid), absorbing or releasing a large amount of latent heat in the process, thereby achieving energy storage and supply. For example, a phase change energy storage module can use the absorption / release characteristics of PCMs to heat tap water to provide people with comfortable domestic hot water.

[0067] Phase change energy storage materials (PCEs) naturally exhibit supercooling (the PCE does not crystallize after reaching the phase change temperature during solidification and heat release; instead, it begins to crystallize and release heat at a lower temperature). The difference between the temperature at which the PCE begins to crystallize and release heat and the phase change temperature is called the supercooling. Excessive supercooling leads to large temperature fluctuations on the water side, affecting the user experience. Too much supercooling, on the other hand, will cause the material to fail to solidify and release heat (failure).

[0068] However, when the phase change material fails, the phase change energy storage module will also fail, making it unable to maintain the temperature of the supplied hot water. Therefore, how to detect whether the phase change energy storage module has failed becomes a problem.

[0069] To address the aforementioned problem of detecting the failure state of phase change energy storage modules, this application provides a failure detection method for phase change energy storage modules. The execution entity of this failure detection method can be the failure detection device for phase change energy storage modules provided in this application, or a heating and ventilation equipment that integrates the failure detection device for phase change energy storage modules. The failure detection device for phase change energy storage modules can be implemented in hardware or software.

[0070] Please refer to Figure 1 This application provides a heating, ventilation and air conditioning system 10, which includes a heat source unit 21, a phase change energy storage module 31, an energy charging inlet 41, an energy charging outlet 42, an energy dissipation outlet 51, an energy dissipation inlet 52, an energy charging flow path 61, and an energy dissipation flow path 62.

[0071] The HVAC system 10 provided in this application includes a heat source unit 21 and a phase change energy storage module 31. The phase change energy storage module 31 is connected to the heat source unit 21. The phase change energy storage module 31 is provided with multiple charging flow paths 61 and multiple releasing flow paths 62. The heat source unit 21 can be connected to the charging flow path 61 through the charging inlet 41 and the charging outlet 42. The hot fluid in the heat source unit 21 can flow into the charging flow path 61. The charging flow path 61 can transfer heat to the phase change material in the phase change energy storage module 31. After cold water flows into the releasing flow path 62 through the releasing inlet 52, it can absorb the heat of the phase change material. After the cold water is heated into hot water, it can flow out through the releasing outlet 51 for users to use. The HVAC system 10 provided in this application can provide users with clean hot water without the need to set up a water tank to store hot water.

[0072] Specifically, in the HVAC system 10 provided in this embodiment, the heat source unit 21 includes a controller, wherein the controller is used for:

[0073] When the phase change energy storage module is in non-heat storage mode, the failure detection reference temperature of the phase change material in the module is monitored based on a preset detection cycle. This failure detection reference temperature is the temperature detected in the region corresponding to the lowest temperature gradient in the temperature gradient formed in the energy flow path direction within the phase change energy storage module. Based on multiple monitored failure detection reference temperatures, a temperature rise inflection point is determined, and the theoretical supercooling of the phase change material is determined based on this inflection point and the phase change temperature. Similarly, a temperature fall inflection point is determined based on these multiple monitored failure detection reference temperatures, and the actual supercooling of the phase change material is determined based on this inflection point and the phase change temperature. The ratio between the actual supercooling and the theoretical supercooling is determined. If this ratio is less than a preset ratio, the phase change energy storage module is considered to have failed. Therefore, this application can detect whether a phase change energy storage module has failed using the above method, enabling timely detection of failures and allowing for prompt resolution of the problem, maintaining the stable operation of the HVAC system corresponding to the phase change energy storage module, and reducing losses caused by phase change energy storage module failures. The methods provided in the embodiments of this application will be described in detail below.

[0074] Next, please refer to Figure 2 , Figure 2 This is a schematic flowchart of the first method for detecting the failure of a phase change energy storage module provided in this application embodiment. The specific flow of the method for detecting the failure of a phase change energy storage module provided in this application embodiment can be as follows:

[0075] S110. When the phase change energy storage module is in non-heat storage mode, monitor the failure detection reference temperature of the phase change material in the phase change energy storage module based on a preset detection cycle.

[0076] The non-heat storage mode refers to the phase change energy storage module not being in a heat storage or heat release working state. That is, the phase change material in the phase change energy storage module has not undergone a phase change due to the action of an external heat source or cold source, and is therefore not in the process of energy storage or release.

[0077] The failure detection reference temperature is the temperature detected at the region corresponding to the lowest temperature gradient in the temperature gradient formed along the charging flow path within the phase change energy storage module. This application collects data on this failure detection reference temperature and determines whether the phase change energy storage module has failed based on the changes in this reference temperature.

[0078] It should be noted that inside the phase change energy storage module, a temperature gradient will be formed along the energy flow path (i.e., the path of energy flow or transfer), and the temperature value corresponding to this temperature gradient decreases along the energy flow path.

[0079] In this embodiment, when collecting the failure detection reference temperature of the phase change material in the phase change energy storage module, a preset detection period is used. This preset detection period can be set by those skilled in the art as needed. For example, the preset detection period can be 10 seconds, meaning the failure detection reference temperature of the phase change material in the phase change energy storage module is collected every 10 seconds. Alternatively, the preset detection period can be 15 seconds, meaning the failure detection reference temperature of the phase change material in the phase change energy storage module is collected every 15 seconds. Preferably, since the phase change material undergoes a series of physical or chemical changes when the temperature changes, these changes require a certain amount of time to fully unfold. Therefore, the detection system needs a time window to accurately capture the temperature change of the phase change material. This time window is not fixed and can be set or adjusted according to the characteristics of the phase change material and the sensitivity of the detection system. Those skilled in the art can determine the aforementioned time window for the currently used phase change material and set the preset detection period accordingly. For example, if a 10-second time window is needed to detect the temperature change in the phase change material, then the preset period can be set to 10 seconds.

[0080] In this embodiment, when the phase change energy storage module is not in a heat storage or heat release operating state, the failure detection reference temperature of the phase change material in the phase change energy storage module is collected based on a preset detection cycle. It is understood that multiple temperature values ​​corresponding to this failure detection reference temperature can be collected.

[0081] S120. Determine the temperature rise inflection point based on multiple monitored failure detection reference temperatures, and determine the theoretical supercooling of the phase change material based on the temperature rise inflection point and the phase change temperature of the phase change material.

[0082] Phase transition temperature refers to the critical temperature at which a substance transitions between different phases. At the phase transition temperature, the state of the substance (e.g., solid, liquid, gas) changes, accompanied by the absorption or release of heat. For example, the freezing point of water is 0°C, which is the phase transition temperature at which water changes from a liquid to a solid (ice); while the boiling point of water is 100°C (at standard atmospheric pressure), which is the phase transition temperature at which water changes from a liquid to a gas (water vapor). It is understood that the phase transition temperature obtained in the embodiments of this application refers to the phase transition temperature of the phase change material in the phase change energy storage module.

[0083] The theoretical undercooling refers to the difference between the lowest temperature at which the phase change material begins to crystallize and the theoretical phase transition temperature. It should be noted that this application finds the aforementioned lowest temperature by collecting the failure detection reference temperature, and then calculates the theoretical undercooling of the phase change material based on this failure detection reference temperature.

[0084] In this embodiment of the application, multiple failure detection reference temperatures collected on the timeline can be used to obtain the corresponding time-temperature curve. Based on the time-temperature curve, the temperature rise inflection point can be observed more intuitively. The temperature rise inflection point refers to the point on the time-temperature curve where the direction of the curve changes from decreasing to increasing, that is, the point where the temperature changes from increasing to rising.

[0085] For example, please refer to Figure 3 , Figure 3 This diagram illustrates the temperature change of the phase change material during the solidification exothermic stage (i.e., non-heat storage mode) in the failure detection method for the phase change energy storage module provided in this application embodiment. The inflection point of the temperature rise corresponds to... Figure 3 The blue dots in the image. Among them, Figure 3 The diagram illustrates the data corresponding to a certain phase change material.

[0086] In this embodiment of the application, after capturing the temperature rise inflection point based on these multiple failure detection reference temperatures, the theoretical supercooling of the phase change material can be determined based on the phase change temperature of the phase change material in the phase change energy storage module at the temperature rise inflection point.

[0087] In this embodiment, when determining the theoretical supercooling, the temperature rise inflection point is determined by detecting the temperature transition between two adjacent failure detection reference temperatures. When the first failure detection reference temperature at the previous moment is lower than the second failure detection reference temperature at the next moment, the second failure detection reference temperature is determined as the temperature rise inflection point. Please refer to [reference needed]. Figure 3 The blue dot indicates the inflection point of temperature rise. The theoretical supercooling is calculated based on the first failure detection reference temperature collected at the previous moment corresponding to this inflection point and the phase transition temperature of the phase change material.

[0088] Specifically, when determining the theoretical undercooling based on the first failure detection reference temperature and the phase change temperature, a first difference between the phase change temperature and the first failure detection reference temperature is calculated, and the first difference is used as the theoretical undercooling.

[0089] That is, assuming the theoretical undercooling is TSC_i, the phase transition temperature of the phase change material is T_melt, and the first failure detection reference temperature is TSC_ref, then the formula for calculating the theoretical undercooling is:

[0090] TSC_i = T_melt - TSC_ref

[0091] S130. Determine the temperature drop inflection point based on multiple monitored failure detection reference temperatures, and determine the actual undercooling of the phase change material based on the temperature drop inflection point and the temperature rise inflection point.

[0092] The actual undercooling is the difference between the actual temperature at which the phase change begins and the theoretical phase change temperature (or equilibrium phase change temperature) during the phase change process of a material.

[0093] In this embodiment of the application, multiple failure detection reference temperatures collected on the timeline can be used to obtain a corresponding time-temperature curve. Based on the time-temperature curve, the temperature drop inflection point can be observed more intuitively. The temperature drop inflection point refers to the point on the time-temperature curve where the direction of the curve changes from rising to falling, that is, the point where the temperature changes from falling.

[0094] For example, please refer to the same reference. Figure 3 , Figure 3 This diagram illustrates the temperature change of the phase change material during the solidification exothermic stage (i.e., non-heat storage mode) in the failure detection method for the phase change energy storage module provided in this application embodiment. The inflection point of the temperature decrease is... Figure 3 The orange dots in the image.

[0095] In this embodiment of the application, after capturing the temperature drop inflection point based on these multiple failure detection reference temperatures, the actual supercooling of the phase change material can be determined based on the temperature drop inflection point and the phase change temperature of the phase change material in the phase change energy storage module.

[0096] In this embodiment, when determining the actual supercooling, the temperature drop inflection point is also determined by detecting the temperature transition between two adjacent failure detection reference temperatures. When the third failure detection temperature at the previous moment is greater than the fourth failure detection reference temperature at the next moment, the fourth failure detection reference temperature is determined as the temperature drop inflection point. Please refer to [reference needed]. Figure 3 The orange dot indicates the temperature drop inflection point. The actual supercooling is calculated based on the third failure detection temperature collected at the previous moment corresponding to this temperature drop inflection point and the first failure detection reference temperature collected at the previous moment corresponding to the aforementioned temperature rise inflection point.

[0097] Specifically, when determining the actual subcooling based on the third failure detection reference temperature and the first failure detection reference temperature, a second difference between the third failure detection reference temperature and the first failure detection reference temperature is calculated, and the second difference is used as the actual subcooling.

[0098] That is, assuming the actual subcooling is TSC_r and the third failure detection reference temperature is TSC_sol, then the formula for calculating the actual subcooling is:

[0099] TSC_r = TSC_sol - TSC_ref

[0100] S140. Determine the ratio between the actual supercooling degree and the theoretical supercooling degree. When the ratio is less than a preset ratio, it is determined that the phase change energy storage module fails.

[0101] Among them, the preset ratio is set by those skilled in the art according to the empirical values obtained in the actual scenario. The preset ratio needs to be relatively small. For example, if the preset ratio is set to 0.1, it means that the actual supercooling degree is extremely small, almost non-existent, that is, the temperature rebound degree of the phase change material is very small, so it is determined that the phase change material fails. It can be understood that the corresponding empirical values of different phase change materials are different.

[0102] Among them, the ratio between the actual supercooling degree and the theoretical supercooling degree can also be called the supercooling ratio, which characterizes the temperature rebound degree after supercooled crystallization and heat release.

[0103] Specifically, in the embodiments of the present application, after determining the actual supercooling degree and the theoretical supercooling degree, the ratio between the actual supercooling degree and the theoretical supercooling degree is determined.

[0104] That is, let the ratio be TSC_ratio, which can also be called the supercooling ratio. Then the calculation formula of this ratio (supercooling ratio) is:

[0105] TSC_ratio = TSC_r / TSC_i

[0106] In the embodiments of the present application, whether the phase change energy storage module fails is determined by the ratio between the actual supercooling degree and the theoretical supercooling degree. When the ratio is less than the preset ratio, it is determined that the phase change energy storage module fails.

[0107] That is, let the preset ratio be a. Then when TSC_ratio < a, it is determined that the phase change energy storage module fails.

[0108] In specific implementation, the present application is not limited by the execution order of the described steps. Without conflict, some steps can also be performed in other orders or simultaneously.

[0109] In addition, when the controller of the heat source unit detects that the phase change energy storage module fails, for example, the failure situation of the phase change energy storage module can be notified through a fault light indication and a phase change energy storage module failure alarm sound effect. Another example is that the failure information of the phase change energy storage module can be sent to the terminal device of the user of the HVAC system, so that the failure situation can be detected in time, and thus processed in time, reducing the losses caused by the failure of the phase change energy storage module.

[0110] As can be seen from the above, the failure detection method for the phase change energy storage module provided in this application, when the phase change energy storage module is in non-heat storage mode, monitors the failure detection reference temperature of the phase change material in the phase change energy storage module based on a preset detection cycle. The failure detection reference temperature is the temperature detected in the region corresponding to the lowest temperature gradient in the temperature gradient formed in the charging flow path direction within the phase change energy storage module. Based on the monitored multiple failure detection reference temperatures, the temperature rise inflection point is determined, and the theoretical supercooling of the phase change material is determined according to the temperature rise inflection point and the phase change temperature of the phase change material. The method involves determining the temperature drop inflection point by obtaining multiple failure detection reference temperatures, and then determining the actual subcooling of the phase change material based on the temperature drop inflection point and the temperature rise inflection point. The ratio between the actual subcooling and the theoretical subcooling is then determined. If the ratio is less than a preset ratio, the phase change energy storage module is considered to have failed. Therefore, this application can detect whether a phase change energy storage module has failed using the above method, enabling timely detection of the failure and allowing for prompt resolution of the problem. This maintains the stable operation of the HVAC system corresponding to the phase change energy storage module and reduces losses caused by phase change energy storage module failures.

[0111] Based on the methods described in the preceding embodiments, the following examples will provide further detailed explanations.

[0112] Please see Figure 4 , Figure 4 This is a second flowchart illustrating the failure detection method for a phase change energy storage module provided in this application embodiment. The specific flow of the failure detection method for a phase change energy storage module provided in this application embodiment can be as follows:

[0113] S210. When the phase change energy storage module is in non-heat storage mode, monitor the failure detection reference temperature of the phase change material in the phase change energy storage module based on a preset detection cycle.

[0114] The non-heat storage mode refers to the phase change energy storage module not being in a heat storage or heat release working state. That is, the phase change material in the phase change energy storage module has not undergone a phase change due to the action of an external heat source or cold source, and is therefore not in the process of energy storage or release.

[0115] The failure detection reference temperature is the temperature detected at the region corresponding to the lowest temperature gradient in the temperature gradient formed along the charging flow path within the phase change energy storage module. This application collects data on this failure detection reference temperature and determines whether the phase change energy storage module has failed based on the changes in this reference temperature.

[0116] It should be noted that inside the phase change energy storage module, a temperature gradient will be formed along the energy flow path (i.e., the path of energy flow or transfer), and the temperature value corresponding to this temperature gradient decreases along the energy flow path.

[0117] In this embodiment, when collecting the failure detection reference temperature of the phase change material in the phase change energy storage module, a preset detection period is used. This preset detection period can be set by those skilled in the art as needed. For example, the preset detection period can be 10 seconds, meaning the failure detection reference temperature of the phase change material in the phase change energy storage module is collected every 10 seconds. Alternatively, the preset detection period can be 15 seconds, meaning the failure detection reference temperature of the phase change material in the phase change energy storage module is collected every 15 seconds. Preferably, since the phase change material undergoes a series of physical or chemical changes when the temperature changes, these changes require a certain amount of time to fully unfold. Therefore, the detection system needs a time window to accurately capture the temperature change of the phase change material. This time window is not fixed and can be set or adjusted according to the characteristics of the phase change material and the sensitivity of the detection system. Those skilled in the art can determine the aforementioned time window for the currently used phase change material and set the preset detection period accordingly. For example, if a 10-second time window is needed to detect the temperature change in the phase change material, then the preset period can be set to 10 seconds.

[0118] In this embodiment of the application, specifically, the failure detection reference temperature of the phase change material in the phase change energy storage module can be monitored based on a preset detection cycle when the phase change energy storage module enters standby mode or heat release mode.

[0119] In one possible implementation, the phase change energy storage module is equipped with multiple temperature sensors, which are arranged sequentially and at intervals along the direction of the charging flow path. The multiple temperature sensors are used to detect the temperature of the phase change material. When monitoring the failure detection reference temperature of the phase change material in the phase change energy storage module based on a preset detection cycle, the temperature sensor located in the region corresponding to the lowest temperature gradient formed in the direction of the charging flow path in the phase change energy storage module can be identified as the target temperature sensor. The temperature detected by the target temperature sensor is taken as the target temperature, and the failure detection reference temperature is determined based on the target temperature.

[0120] It is understood that one or more target temperature sensors may be set in the region corresponding to the lowest temperature gradient within the phase change energy storage module in this application embodiment, and the multiple temperature values ​​monitored by these target temperature sensors based on the preset detection cycle shall be used as the temperature values ​​corresponding to the target temperature.

[0121] In one example, when determining the region corresponding to the lowest temperature gradient in the temperature gradient formed in the charging flow path direction within the phase change energy storage module as the target temperature sensor, multiple temperature values ​​detected by multiple temperature sensors can be obtained. The temperature distribution is divided according to the magnitude of the multiple temperature values ​​to obtain multiple temperature gradients. The temperature sensor corresponding to the region with the lowest temperature gradient among the multiple temperature gradients is then used as the target temperature sensor.

[0122] It is understood that inside the phase change energy storage module provided in this application embodiment, a temperature gradient is formed along the charging flow path. The temperature value corresponding to the temperature gradient decreases along the charging flow path. The lowest temperature gradient can be determined based on the temperature values ​​detected by multiple temperature sensors that are sequentially spaced along the charging flow path in the phase change energy storage module. The temperature sensor set in the region corresponding to the lowest temperature gradient is used as the target temperature sensor.

[0123] It should be noted that, in the embodiments of this application, when calculating the theoretical supercooling, it is necessary to use the difference between the lowest temperature at which the phase change material begins to crystallize and the theoretical phase change temperature. Therefore, in order to obtain the lowest temperature, this application uses the target temperature sensor to collect the failure detection reference temperature to find the aforementioned lowest temperature, and then calculates the theoretical supercooling of the phase change material mentioned below based on the failure detection reference temperature.

[0124] In one example, when determining the failure detection reference temperature based on the target temperature, the average value of the target temperature can be obtained and used as the failure detection reference temperature.

[0125] Understandably, by obtaining the average of these multiple failure detection reference temperatures, all collected temperature values ​​can be equalized to make them closer to the true situation of the data, thereby improving the accuracy of finding the aforementioned lowest temperature based on the failure detection reference temperature.

[0126] It should be noted that each time the failure detection reference temperature is collected, since there are multiple target temperature sensors for collecting the failure detection reference temperature, multiple temperature values ​​corresponding to the failure detection reference temperature will be collected. This temperature value is the target temperature. The average value of the target temperature is used as the failure detection reference temperature corresponding to this collection time.

[0127] In another example, when determining the failure detection reference temperature based on the target temperature, the lowest temperature among the target temperatures can be determined and used as the failure detection reference temperature.

[0128] It is understood that, since the failure detection reference temperature is used to find the aforementioned minimum temperature in this embodiment of the application, and the theoretical undercooling of the phase change material is calculated using the minimum temperature, the lowest temperature value among the target temperature values ​​corresponding to the multiple failure detection reference temperatures collected by multiple target temperature sensors is used as the failure detection reference temperature, so that the detected failure detection reference temperature is closer to the aforementioned minimum temperature, thereby improving the accuracy of finding the aforementioned minimum temperature.

[0129] It should be noted that when collecting the failure detection reference temperature each time, since there are multiple target temperature sensors for collecting the failure detection reference temperature, multiple temperature values ​​corresponding to the failure detection reference temperature will be collected. This temperature value is the target temperature. The lowest temperature value among the target temperatures is used as the failure detection reference temperature at this time of collection.

[0130] S220. When the first failure detection reference temperature corresponding to the previous moment is lower than the second failure detection reference temperature corresponding to the next moment among two adjacent failure detection reference temperatures, the second failure detection reference temperature is determined as the temperature rise inflection point, and the theoretical supercooling is determined based on the first failure detection reference temperature and the phase transition temperature.

[0131] In this embodiment, the temperature rise inflection point is determined by detecting the temperature change between two adjacent failure detection reference temperatures. When the first failure detection reference temperature at the previous moment is lower than the second failure detection reference temperature at the next moment, the second failure detection reference temperature is determined to be the temperature rise inflection point. Please refer to [link / reference]. Figure 3 The blue dot indicates the inflection point of temperature rise. The theoretical supercooling is calculated based on the first failure detection reference temperature collected at the previous moment corresponding to this inflection point and the phase transition temperature of the phase change material.

[0132] Specifically, when determining the theoretical undercooling based on the first failure detection reference temperature and the phase change temperature, a first difference between the phase change temperature and the first failure detection reference temperature is calculated, and the first difference is used as the theoretical undercooling.

[0133] That is, assuming the theoretical undercooling is TSC_i, the phase transition temperature of the phase change material is T_melt, and the first failure detection reference temperature is TSC_ref, then the formula for calculating the theoretical undercooling is:

[0134] TSC_i = T_melt - TSC_ref

[0135] S230. When the third failure detection temperature at the previous moment is greater than the fourth failure detection temperature at the next moment among two adjacent failure detection reference temperatures, the fourth failure detection reference temperature is determined as the temperature drop inflection point, and the actual subcooling is determined based on the third failure detection reference temperature and the first failure detection reference temperature.

[0136] In this embodiment, the temperature drop inflection point is also determined by detecting the temperature change between two adjacent failure detection reference temperatures. When the third failure detection temperature at the previous moment is greater than the fourth failure detection reference temperature at the next moment, the fourth failure detection reference temperature is determined as the temperature drop inflection point. Please refer to [link / reference]. Figure 3 The orange dot indicates the temperature drop inflection point. The actual supercooling is calculated based on the third failure detection temperature collected at the previous moment corresponding to this temperature drop inflection point and the first failure detection reference temperature collected at the previous moment corresponding to the aforementioned temperature rise inflection point.

[0137] Specifically, when determining the actual subcooling based on the third failure detection reference temperature and the first failure detection reference temperature, a second difference between the third failure detection reference temperature and the first failure detection reference temperature is calculated, and the second difference is used as the actual subcooling.

[0138] That is, assuming the actual subcooling is TSC_r and the third failure detection reference temperature is TSC_sol, then the formula for calculating the actual subcooling is:

[0139] TSC_r = TSC_sol - TSC_ref

[0140] S240. Determine the ratio between the actual subcooling and the theoretical subcooling.

[0141] In this embodiment of the application, after determining the actual subcooling and the theoretical subcooling, the ratio between the actual subcooling and the theoretical subcooling is determined.

[0142] That is, let this ratio be TSC_ratio, also known as the subcooling ratio, then the formula for calculating this ratio (subcooling ratio) is:

[0143] TSC_ratio = TSC_r / TSC_i

[0144] S250: Obtain the lowest effective heating temperature when the heat source unit provides heat to the phase change energy storage module, obtain the average heat exchanger temperature difference between the phase change material and the cold water in the phase change energy storage module, and the phase change temperature of the phase change material, and determine the subcooling abnormal temperature threshold based on the lowest effective heating temperature, the average heat exchanger temperature difference and the phase change temperature.

[0145] Among them, the heat source unit is a device that provides heat to the phase change energy storage module. For example, the heat source unit can be an outdoor heat pump.

[0146] In the embodiments of the present application, in order to further improve the accuracy of judging the failure of the phase change energy storage module, by obtaining the lowest effective heating temperature when the heat source unit provides heat to the phase change energy storage module, obtaining the average heat exchanger temperature difference between the phase change material and cold water in the phase change energy storage module, and the phase change temperature of the phase change material, and determining the supercooling abnormal temperature threshold according to the lowest effective heating temperature, the average heat exchanger temperature difference, and the phase change temperature, so that the failure of the phase change energy storage module is judged jointly by the above ratio and the supercooling abnormal temperature threshold subsequently. For specific content, please refer to the following text and will not be elaborated here.

[0147] In the embodiments of the present application, when determining the supercooling abnormal temperature threshold according to the lowest effective heating temperature, the average heat exchanger temperature difference, and the phase change temperature, calculate the sum of the temperatures of the lowest effective heating temperature and the average heat exchange temperature difference, determine the target difference between the phase change temperature and the sum of the temperatures, and use the target difference as the supercooling abnormal temperature threshold.

[0148] That is, let the supercooling abnormal temperature threshold be b, the lowest effective heating temperature be Tw_min, where Tw refers to the effective heating temperature, and the average heat exchanger temperature difference be δT_hex. Then the calculation formula for the supercooling abnormal temperature threshold is as follows:

[0149] b = T_melt - Tw_min - δT_hex

[0150] S260. When the ratio is less than the preset ratio and the theoretical supercooling degree is greater than the supercooling abnormal temperature threshold, determine that the phase change energy storage module fails.

[0151] In the embodiments of the present application, when the ratio is less than the preset ratio and the theoretical supercooling degree is greater than the supercooling abnormal temperature threshold, determine that the phase change energy storage module fails.

[0152] That is, let the preset ratio be a. Then when TSC_ratio b, determine that the phase change energy storage module fails.

[0153] In addition, when the controller of the heat source unit detects the failure of the phase change energy storage module, for example, the failure situation of the phase change energy storage module can be informed through a fault light indication and an alarm sound effect for the failure of the phase change energy storage module. For another example, the failure information of the phase change energy storage module can be sent to the terminal device of the user of the HVAC system, so that the failure situation can be detected in time, and thus processed in time to reduce the losses caused by the failure of the phase change energy storage module.

[0154] As can be seen from the above, the failure detection method for the phase change energy storage module proposed in this application monitors the failure detection reference temperature of the phase change material in the phase change energy storage module based on a preset detection cycle when the phase change energy storage module is in non-heat storage mode. When the first failure detection reference temperature corresponding to the previous moment is lower than the second failure detection reference temperature corresponding to the next moment, the second failure detection reference temperature is determined as the temperature rise inflection point. The theoretical supercooling is determined based on the first failure detection reference temperature and the phase change temperature. When the third failure detection temperature corresponding to the previous moment is higher than the second failure detection reference temperature corresponding to the next moment, the method further determines the theoretical supercooling. When determining the fourth failure detection reference temperature, this fourth failure detection reference temperature is identified as the temperature drop inflection point. The actual subcooling is determined based on the third and first failure detection reference temperatures. The ratio between the actual and theoretical subcooling is then determined. The lowest effective heating temperature at which the heat source unit provides heat to the phase change energy storage module is obtained. The average heat exchanger temperature difference between the phase change material and the chilled water within the phase change energy storage module, as well as the phase change temperature of the phase change material, are also obtained. Based on the lowest effective heating temperature, the average heat exchanger temperature difference, and the phase change temperature, a subcooling anomaly temperature threshold is determined. If the ratio is less than a preset ratio and the theoretical subcooling is greater than the subcooling anomaly temperature threshold, the phase change energy storage module is determined to have failed. Therefore, this application can detect whether a phase change energy storage module has failed using the above method, enabling timely detection of failures and allowing for prompt resolution of the problem. This maintains the stable operation of the HVAC system corresponding to the phase change energy storage module and reduces losses caused by phase change energy storage module failures. Furthermore, this application can further improve the accuracy of the failure judgment of the phase change energy storage module by determining that the phase change energy storage module is faulty when the ratio is less than the preset ratio and the theoretical supercooling is greater than the supercooling abnormal temperature threshold.

[0155] To further illustrate the failure detection method for the phase change energy storage module provided in this application, please refer to... Figure 5 , Figure 5 This is a third flowchart illustrating the failure detection method for the phase change energy storage module provided in this application embodiment, applied in a practical scenario. Here, T5_2 represents the collected failure detection reference temperature.

[0156] It should be noted that in this practical application scenario, the preset detection cycle is 10 seconds, and the HVAC system corresponding to the phase change energy storage module is in hot water production mode and in standby mode. The specific process of the failure detection method for the phase change energy storage module in this practical application scenario can be as follows:

[0157] S310, the HVAC system is in hot water production mode and is in standby mode.

[0158] S320. Determine if T5_2 10 seconds ago - T5_2 now < -1℃. If yes, proceed to step S330; otherwise, continue with step S320.

[0159] It should be noted that, in practical applications, the failure detection method for phase change energy storage modules provided in this application can determine the temperature rise inflection point in real time based on the failure detection reference temperatures collected at the current moment and the previous moment.

[0160] In step S320, "previous T5_2" refers to the failure detection reference temperature detected at the previous moment, and "current T5_2" refers to the failure detection reference temperature detected at the current moment. It can be understood that when the detected failure detection temperature satisfies "previous T5_2 - current T5_2 < -1℃", meaning the temperature value at the previous moment is less than the temperature value at the current moment, it indicates that the current moment corresponds to a temperature inflection point. In this case, "previous T5_2" is the first failure detection reference temperature, and "current T5_2" is the second failure detection reference temperature.

[0161] It should be noted that if the detected failure detection temperature does not meet the condition that the previous T5_2 - the current T5_2 < -1℃, then the judgment in step S320 will continue to be performed on the collected failure detection temperature.

[0162] S330, Record T5_2 10s ago as TSC_ref, calculate the theoretical supercooling TSC_i = T_melt - TSC_ref.

[0163] It is understandable that when the detected failure detection temperature satisfies the condition that the previous T5_2 - the current T5_2 < -1℃, the previous T5_2 is TSC_ref. At this time, the theoretical supercooling of the phase change material in the current phase change energy storage module is calculated by using TSC_ref as TSC_i = T_melt - TSC_ref.

[0164] S340. Determine if T5_2 10s ago - T5_2 now > 0.1℃? If yes, proceed to step S350; otherwise, continue to step S340.

[0165] In step S340, "previous T5_2" refers to the failure detection reference temperature detected at the previous moment, and "current T5_2" refers to the failure detection reference temperature detected at the current moment. It can be understood that when the detected failure detection temperature satisfies "previous T5_2 - current T5_2 > 0.1℃," meaning the temperature value at the previous moment is greater than the temperature value at the current moment, it indicates that the current moment corresponds to a temperature drop inflection point. In this case, "previous T5_2" is the third failure detection temperature mentioned above, and "current T5_2" is the fourth failure detection reference temperature.

[0166] It should be noted that if the detected failure detection temperature does not meet the condition that the previous T5_2 - the current T5_2 > 0.1℃, the judgment in step S340 will continue to be performed on the collected failure detection temperature.

[0167] S350, record T5_2 as TSC_sol 10s ago, calculate the actual subcooling TSC_r = TSC_sol - TSC_ref, and calculate the subcooling ratio TSC_ratio = TSC_r / TSC_i.

[0168] It is understandable that when the detected failure detection temperature satisfies the condition that the previous T5_2 - the current T5_2 > 0.1℃, the previous T5_2 is TSC_sol. At this time, the actual supercooling is calculated by using the TSC_sol corresponding to the temperature drop inflection point and the TSC_ref corresponding to the temperature rise inflection point determined in step S330: TSC_r = TSC_sol - TSC_ref.

[0169] Furthermore, the ratio between the actual subcooling and the theoretical subcooling is determined, i.e., the subcooling ratio is:

[0170] TSC_ratio = TSC_r / TSC_i.

[0171] S360. Determine if TSC_ratio < 0.1 and TSC_i > T_melt - Tw_min - δT_hex. If yes, proceed to step S370; otherwise, continue with step S360.

[0172] By obtaining the subcooling ratio and theoretical subcooling, we can jointly determine whether the phase change energy storage module has failed.

[0173] Here, the subcooling anomaly temperature threshold b is further determined, where b is T_melt-Tw_min-δT_hex, Tw_min is the lowest effective heating temperature, δT_hex is the average heat transfer temperature difference, and T_melt is the phase change temperature of the phase change material.

[0174] Determine if TSC_ratio < 0.1 and TSC_i > T_melt - Tw_min - δT_hex. If yes, proceed to step S370, which confirms that the phase change energy storage module has failed. If not, continue to step S360.

[0175] S370, The phase change energy storage module has been determined to be faulty.

[0176] The above process allows for the detection of failures in phase change energy storage modules. The failure detection method for phase change energy storage modules proposed in this application can promptly identify module failures, maintain the stable operation of the corresponding HVAC system, and reduce losses caused by module malfunctions.

[0177] Furthermore, to better implement the failure detection method for the phase change energy storage module in the embodiments of this application, this application also provides a heating and ventilation device based on the failure detection method for the phase change energy storage module. Please refer to... Figure 6 , Figure 6 This is a schematic diagram of a first structure of a heating, ventilation, and air conditioning (HVAC) device provided in an embodiment of this application. The HVAC device 400 includes a processor 401 and a memory 402. The processor 401 and the memory 402 are electrically connected.

[0178] The processor 401 is the control center of the HVAC equipment 400. It connects to various parts of the entire HVAC equipment via various interfaces and lines. By running or calling computer programs stored in memory 402, and by calling data stored in memory 402, it executes various functions of the HVAC equipment and processes data, thereby providing overall monitoring of the HVAC equipment. The processor 401 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0179] The memory 402 can be used to store computer programs and data. The computer programs stored in the memory 402 contain instructions that can be executed in the processor. The computer programs can be composed of various functional modules. The processor 401 executes various functional applications and data processing by calling the computer programs stored in the memory 402. The memory 402 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the HVAC equipment 400 (such as audio data, video data, etc.). In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0180] In this embodiment, the processor 401 in the HVAC equipment 400 loads the instructions corresponding to the processes of one or more computer programs into the memory 402 according to the following steps, and the processor 401 runs the computer programs stored in the memory 402 to realize various functions:

[0181] When the phase change energy storage module is in non-heat storage mode, the failure detection reference temperature of the phase change material in the phase change energy storage module is monitored based on a preset detection cycle. The failure detection reference temperature is the temperature detected in the region corresponding to the lowest temperature gradient in the temperature gradient formed in the charging flow path direction within the phase change energy storage module.

[0182] Based on the multiple failure detection reference temperatures monitored above, the temperature rise inflection point is determined, and the theoretical undercooling of the phase change material is determined based on the temperature rise inflection point and the phase change temperature of the phase change material.

[0183] Based on the multiple failure detection reference temperatures monitored above, the temperature drop inflection point is determined, and the actual undercooling of the phase change material is determined based on the temperature drop inflection point and the temperature rise inflection point.

[0184] The ratio between the actual subcooling and the theoretical subcooling is determined. If the ratio is less than a preset ratio, the phase change energy storage module is determined to be faulty.

[0185] In some embodiments, please refer to Figure 7 , Figure 7This is a second structural schematic diagram of the HVAC equipment provided in the embodiments of this application. The HVAC equipment 400 further includes: a heat source unit 403 and a phase change energy storage module 404, the phase change energy storage module 404 being connected to the heat source unit 403.

[0186] For a detailed introduction to the heat source unit and phase change energy storage module, please refer to the relevant descriptions above, which will not be repeated here.

[0187] In this embodiment, the processor 401 in the HVAC equipment 400 loads the instructions corresponding to the processes of one or more computer programs into the memory 402 according to the following steps, and the processor 401 runs the computer programs stored in the memory 402 to realize various functions:

[0188] When the phase change energy storage module is in non-heat storage mode, the failure detection reference temperature of the phase change material in the phase change energy storage module is monitored based on a preset detection cycle. The failure detection reference temperature is the temperature detected in the region corresponding to the lowest temperature gradient in the temperature gradient formed in the charging flow path direction within the phase change energy storage module.

[0189] Based on the multiple failure detection reference temperatures monitored above, the temperature rise inflection point is determined, and the theoretical undercooling of the phase change material is determined based on the temperature rise inflection point and the phase change temperature of the phase change material.

[0190] Based on the multiple failure detection reference temperatures monitored above, the temperature drop inflection point is determined, and the actual undercooling of the phase change material is determined based on the temperature drop inflection point and the temperature rise inflection point.

[0191] The ratio between the actual subcooling and the theoretical subcooling is determined. If the ratio is less than a preset ratio, the phase change energy storage module is determined to be faulty.

[0192] In one possible implementation, when processor 401 executes the following steps: determining the temperature rise inflection point based on the monitored multiple failure detection reference temperatures, and determining the theoretical supercooling of the phase change material based on the temperature rise inflection point and the phase change temperature of the phase change material:

[0193] If, in two adjacent failure detection reference temperatures monitored, the first failure detection reference temperature at the previous moment is lower than the second failure detection reference temperature at the next moment, the second failure detection reference temperature is determined to be the temperature rise inflection point.

[0194] The theoretical undercooling is determined based on the first failure detection reference temperature and the phase transition temperature.

[0195] In one possible implementation, when processor 401 determines the theoretical undercooling based on the first failure detection reference temperature and the phase transition temperature, it may perform the following:

[0196] Calculate the first difference between the phase transition temperature and the first failure detection reference temperature;

[0197] The first difference mentioned above is taken as the theoretical supercooling.

[0198] In one possible implementation, when processor 401 performs the following steps: determining the temperature drop inflection point based on the monitored multiple failure detection reference temperatures, and determining the actual undercooling of the phase change material based on the temperature drop inflection point and the temperature rise inflection point:

[0199] If, in two adjacent failure detection reference temperatures monitored, the third failure detection temperature at the previous moment is greater than the fourth failure detection reference temperature at the next moment, the fourth failure detection reference temperature is determined to be the temperature drop inflection point.

[0200] The actual subcooling is determined based on the third failure detection reference temperature and the first failure detection reference temperature.

[0201] In one possible implementation, when processor 401 determines the actual undercooling based on the third failure detection reference temperature and the first failure detection reference temperature, it may perform the following:

[0202] Calculate the second difference between the third failure detection reference temperature and the first failure detection reference temperature mentioned above;

[0203] The second difference mentioned above is taken as the actual subcooling.

[0204] In one possible implementation, when the processor 401 is in non-heat storage mode and monitors the failure detection reference temperature of the phase change material in the phase change storage module based on a preset detection cycle, it may perform the following:

[0205] When the aforementioned phase change energy storage module enters standby or heat release mode, the failure detection reference temperature of the phase change material in the aforementioned phase change energy storage module is monitored based on a preset detection cycle.

[0206] In one possible implementation, the phase change energy storage module is equipped with multiple temperature sensors, which are arranged sequentially and at intervals according to the direction of the charging flow path. These temperature sensors are used to detect the temperature of the phase change material. When the processor 401 executes the monitoring of the failure detection reference temperature of the phase change material in the phase change energy storage module based on a preset detection cycle, it can perform the following:

[0207] The temperature sensor installed at the region corresponding to the lowest temperature gradient formed in the charging flow path direction within the phase change energy storage module is identified as the target temperature sensor.

[0208] The temperature detected by the aforementioned target temperature sensor is taken as the target temperature, and the aforementioned failure detection reference temperature is determined based on the aforementioned target temperature.

[0209] In one possible implementation, when the processor 401 determines the failure detection reference temperature based on the target temperature, it may perform the following:

[0210] Obtain the average value of the target temperatures mentioned above;

[0211] The above average value is used as the reference temperature for the failure detection.

[0212] In one possible implementation, when the processor 401 determines the failure detection reference temperature based on the target temperature, it may perform the following:

[0213] Determine the lowest temperature among the target temperatures mentioned above;

[0214] The aforementioned lowest temperature is used as the reference temperature for the aforementioned failure detection.

[0215] In one possible implementation, when the processor 401 determines the temperature sensor located at the region corresponding to the lowest temperature gradient formed in the charging flow path direction within the phase change energy storage module as the target temperature sensor, it may perform the following:

[0216] Obtain multiple temperature values ​​detected by the aforementioned multiple temperature sensors;

[0217] Based on the magnitude of the above multiple temperature values, the temperature distribution is divided to obtain multiple temperature gradients;

[0218] The temperature sensor installed in the region corresponding to the lowest temperature gradient among the above multiple temperature gradients is used as the target temperature sensor.

[0219] In one possible implementation, the phase change energy storage module is connected to a heat source unit, which provides heat to the phase change energy storage module. When the processor 401 determines that the phase change energy storage module has failed when the ratio is less than a preset ratio, it may execute the following:

[0220] The lowest effective heating temperature at which the heat source unit provides heat to the phase change energy storage module is obtained.

[0221] The average heat exchanger temperature difference between the phase change material and the cold water in the phase change energy storage module, as well as the phase change temperature of the phase change material, are obtained.

[0222] The subcooling anomaly temperature threshold is determined based on the minimum effective heating temperature, the average heat exchanger temperature difference, and the phase change temperature.

[0223] When the ratio is less than the preset ratio and the theoretical supercooling is greater than the supercooling abnormal temperature threshold, the phase change energy storage module is determined to be faulty.

[0224] In one possible implementation, when processor 401 determines the subcooling anomaly temperature threshold based on the aforementioned minimum effective heating temperature, the aforementioned average heat exchanger temperature difference, and the aforementioned phase change temperature, it may perform the following:

[0225] Calculate the minimum effective heating temperature and the average heat exchange temperature difference mentioned above.

[0226] Determine the target difference between the phase transition temperature and the sum of the temperatures, and use the target difference as the threshold for the supercooling anomaly temperature.

[0227] This application also provides a computer-readable storage medium storing a computer program. When the computer program is run on a computer, the computer executes the failure detection method for the phase change energy storage module described in any of the above embodiments.

[0228] It should be noted that those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, which may include, but is not limited to, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, etc.

[0229] Furthermore, the terms "first," "second," and "third," etc., used in this application are used to distinguish different objects, not to describe a specific order. Additionally, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or modules is not limited to the listed steps or modules, but some embodiments may also include steps or modules not listed, or some embodiments may include other steps or modules inherent to these processes, methods, products, or devices.

[0230] The failure detection method, apparatus, storage medium, and HVAC equipment for phase change energy storage modules provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the methods and core ideas of this application; at the same time, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A failure detection method for a phase change energy storage module, characterized in that, include: When the phase change energy storage module is in non-heat storage mode, the failure detection reference temperature of the phase change material in the phase change energy storage module is monitored based on a preset detection cycle. The failure detection reference temperature is the temperature detected in the region corresponding to the lowest temperature gradient in the temperature gradient formed in the charging flow path direction within the phase change energy storage module. The temperature rise inflection point is determined based on the multiple failure detection reference temperatures monitored, and the theoretical undercooling of the phase change material is determined based on the temperature rise inflection point and the phase change temperature of the phase change material. The temperature drop inflection point is determined based on the multiple failure detection reference temperatures monitored, and the actual undercooling of the phase change material is determined based on the temperature drop inflection point and the temperature rise inflection point. The ratio between the actual subcooling and the theoretical subcooling is determined, and the phase change energy storage module is determined to be faulty when the ratio is less than a preset ratio.

2. The method of claim 1, wherein the phase change energy storage module is a phase change material (PCM) module. The step of determining the temperature rise inflection point based on multiple monitored failure detection reference temperatures, and determining the theoretical supercooling of the phase change material based on the temperature rise inflection point and the phase change temperature of the phase change material, includes: If, in two adjacent failure detection reference temperatures monitored, the first failure detection reference temperature at the previous moment is lower than the second failure detection reference temperature at the next moment, the second failure detection reference temperature is determined as the temperature rise inflection point. The theoretical undercooling is determined based on the first failure detection reference temperature and the phase transition temperature.

3. The method of claim 2, wherein the phase change energy storage module is a phase change material (PCM) module. Determining the theoretical undercooling based on the first failure detection reference temperature and the phase transition temperature includes: Calculate the first difference between the phase transition temperature and the first failure detection reference temperature; The first difference is taken as the theoretical supercooling.

4. The failure detection method for a phase change energy storage module as described in claim 2, characterized in that, The step of determining the temperature drop inflection point based on multiple monitored failure detection reference temperatures, and determining the actual supercooling of the phase change material based on the temperature drop inflection point and the temperature rise inflection point, includes: If, in two adjacent failure detection reference temperatures monitored, the third failure detection temperature at the previous moment is greater than the fourth failure detection reference temperature at the next moment, the fourth failure detection reference temperature is determined as the temperature drop inflection point. The actual subcooling is determined based on the third failure detection reference temperature and the first failure detection reference temperature.

5. The failure detection method for a phase change energy storage module as described in claim 4, characterized in that, Determining the actual subcooling based on the third failure detection reference temperature and the first failure detection reference temperature includes: Calculate the second difference between the third failure detection reference temperature and the first failure detection reference temperature; The second difference is taken as the actual subcooling.

6. The failure detection method for a phase change energy storage module as described in claim 1, characterized in that, When the phase change energy storage module is in non-heat storage mode, the failure detection reference temperature of the phase change material in the phase change energy storage module is monitored based on a preset detection cycle, including: When the phase change energy storage module enters standby or heat release mode, the failure detection reference temperature of the phase change material in the phase change energy storage module is monitored based on a preset detection cycle.

7. The failure detection method for a phase change energy storage module as described in claim 1, characterized in that, The phase change energy storage module is equipped with multiple temperature sensors, which are arranged at intervals according to the direction of the charging flow path. These temperature sensors are used to detect the temperature of the phase change material. The monitoring of the failure detection reference temperature of the phase change material in the phase change energy storage module based on a preset detection cycle includes: The temperature sensor installed at the region corresponding to the lowest temperature gradient formed in the energy flow path direction within the phase change energy storage module is identified as the target temperature sensor. The temperature detected by the target temperature sensor is taken as the target temperature, and the failure detection reference temperature is determined based on the target temperature.

8. The failure detection method for a phase change energy storage module as described in claim 7, characterized in that, Determining the failure detection reference temperature based on the target temperature includes: Obtain the average value of the target temperature; The average value is used as the reference temperature for failure detection.

9. The failure detection method for a phase change energy storage module as described in claim 7, characterized in that, Determining the failure detection reference temperature based on the target temperature includes: Determine the lowest temperature among the target temperatures; The lowest temperature is used as the reference temperature for failure detection.

10. The failure detection method for a phase change energy storage module as described in claim 7, characterized in that, The method of determining the temperature sensor installed at the region corresponding to the lowest temperature gradient formed in the charging flow path direction within the phase change energy storage module as the target temperature sensor includes: Acquire multiple temperature values ​​detected by the multiple temperature sensors; The temperature distribution is divided according to the magnitude of the multiple temperature values ​​to obtain multiple temperature gradients; The temperature sensor installed in the region corresponding to the lowest temperature gradient among the multiple temperature gradients is used as the target temperature sensor.

11. The failure detection method for a phase change energy storage module as described in claim 1, characterized in that, The phase change energy storage module is connected to a heat source unit, and the heat source unit provides heat to the phase change energy storage module. The step of determining that the phase change energy storage module has failed when the ratio is less than a preset ratio includes: Obtain the lowest effective heating temperature when the heat source unit provides heat to the phase change energy storage module; The average heat exchanger temperature difference between the phase change material and the cold water in the phase change energy storage module, as well as the phase change temperature of the phase change material, are obtained. The subcooling anomaly temperature threshold is determined based on the minimum effective heating temperature, the average heat exchanger temperature difference, and the phase change temperature. When the ratio is less than a preset ratio and the theoretical supercooling is greater than the supercooling abnormal temperature threshold, the phase change energy storage module is determined to be faulty.

12. The failure detection method for a phase change energy storage module as described in claim 11, characterized in that, The step of determining the subcooling anomaly temperature threshold based on the lowest effective heating temperature, the average heat exchanger temperature difference, and the phase change temperature includes: Calculate the minimum effective heating temperature and the temperature and value of the average heat exchange temperature difference; Determine the target difference between the phase transition temperature and the sum of the temperatures, and use the target difference as the subcooling anomaly temperature threshold.

13. A heating, ventilation, and air conditioning system, characterized in that, The HVAC system includes: Heat source unit, the heat source unit including controller; A phase change energy storage module, wherein the phase change energy storage module is connected to the heat source unit; The controller is used for: When the phase change energy storage module is in non-heat storage mode, the failure detection reference temperature of the phase change material in the phase change energy storage module is monitored based on a preset detection cycle. The failure detection reference temperature is the temperature detected in the region corresponding to the lowest temperature gradient in the temperature gradient formed in the charging flow path direction within the phase change energy storage module. The temperature rise inflection point is determined based on the multiple failure detection reference temperatures monitored, and the theoretical undercooling of the phase change material is determined based on the temperature rise inflection point and the phase change temperature of the phase change material. The temperature drop inflection point is determined based on the multiple failure detection reference temperatures monitored, and the actual undercooling of the phase change material is determined based on the temperature drop inflection point and the temperature rise inflection point. The ratio between the actual subcooling and the theoretical subcooling is determined, and the phase change energy storage module is determined to be faulty when the ratio is less than a preset ratio.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is run on a computer, it causes the computer to perform the failure detection method for the phase change energy storage module as described in any one of claims 1 to 12.

15. A heating, ventilation, and air conditioning (HVAC) device, comprising a processor and a memory, the memory storing a computer program, characterized in that, The processor invokes the computer program to execute the failure detection method for the phase change energy storage module as described in any one of claims 1 to 12.

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