Evaporator defrosting method and device, refrigeration house refrigerating system and readable storage medium

Abstract

The invention relates to an evaporator defrosting method and device, a refrigeration house refrigerating system and a readable storage medium, and the method comprises the steps that a breathing quotient corresponding to a storage object in a target area and the environment humidity and the environment temperature corresponding to the target area are obtained, and the target area is the area where an evaporator is used for refrigeration; based on the respiration quotient and the environment humidity, the carbonation degree of the frost layer is determined, and based on the environment temperature, the temperature fluctuation rate in the target area is determined; based on the carbonation degree and the temperature fluctuation rate of the frost layer, a target defrosting strategy is determined, and the target defrosting strategy is a defrosting strategy matched with the carbonation degree and the temperature fluctuation rate of the frost layer in multiple defrosting strategies; and according to the target defrosting strategy, the evaporator is defrosted. In this way, the defrosting strategy can be dynamically adjusted based on the carbonation degree of the frost layer and the temperature fluctuation rate in the target area, the defrosting process can give consideration to system energy consumption and energy efficiency at the same time, and the refrigeration storage refrigerating system has the energy-saving effect.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to an evaporator defrosting method, apparatus, cold storage refrigeration system, and readable storage medium. Background Technology

[0002] In cold storage refrigeration systems, evaporators mostly operate in low-temperature and high-humidity environments, and frost easily forms on their surfaces. The frost layer reduces the heat exchange efficiency of the evaporator, leading to increased system energy consumption and decreased cooling capacity. Therefore, defrosting the evaporator is particularly important.

[0003] In related technologies, evaporator defrosting methods usually rely on a single parameter such as frost thickness or temperature. However, this method can easily lead to problems such as using energy-intensive defrosting operations when frost is not severe or when defrosting is not necessary, resulting in increased system energy consumption, or incomplete defrosting when frost is severe, resulting in reduced system energy efficiency.

[0004] Therefore, how to balance system energy consumption and energy efficiency during the defrosting process of the evaporator has become an urgent technical problem to be solved. Summary of the Invention

[0005] This application provides an evaporator defrosting method, apparatus, cold storage refrigeration system, and readable storage medium to solve the problem that evaporator defrosting methods in related technologies usually rely on a single parameter such as frost layer thickness or temperature, which cannot simultaneously take into account system energy consumption and energy efficiency.

[0006] In a first aspect, embodiments of this application provide a defrosting method for an evaporator, the method comprising: Obtain the respiratory quotient corresponding to the object stored in the target area, as well as the ambient humidity and ambient temperature corresponding to the target area, wherein the target area is an area that uses an evaporator for cooling; Based on the respiratory quotient and the ambient humidity, the degree of carbonation of the frost layer is determined, and based on the ambient temperature, the temperature fluctuation rate within the target area is determined. Based on the degree of carbonation of the frost layer and the temperature fluctuation rate, a target defrosting strategy is determined, wherein the target defrosting strategy is a defrosting strategy that matches the degree of carbonation of the frost layer and the temperature fluctuation rate among multiple defrosting strategies. The evaporator is defrosted according to the target defrosting strategy.

[0007] Optionally, determining the target defrosting strategy based on the degree of carbonation of the frost layer and the temperature fluctuation rate includes: When the degree of carbonation of the frost layer is greater than a first preset threshold, the natural defrosting strategy is determined as the target defrosting strategy, wherein the natural defrosting strategy refers to a strategy of defrosting without the aid of an auxiliary defrosting device. When the degree of carbonation of the frost layer is less than or equal to the first preset threshold and greater than or equal to the second preset threshold, the natural defrosting strategy or the fan-assisted defrosting strategy is determined as the target defrosting strategy based on the temperature fluctuation rate, wherein the first preset threshold is greater than the second preset threshold. If the degree of carbonation of the frost layer is less than the second preset threshold, the electric heating-assisted defrosting strategy is determined as the target defrosting strategy.

[0008] Optionally, determining the natural defrosting strategy or the fan-assisted defrosting strategy as the target defrosting strategy based on the temperature fluctuation rate includes: The temperature fluctuation rate is compared with a third preset threshold. If the temperature fluctuation rate is greater than the third preset threshold, the fan-assisted defrosting strategy will be determined as the target defrosting strategy. If the temperature fluctuation rate is less than or equal to the third preset threshold, the natural defrosting strategy is determined as the target defrosting strategy.

[0009] Optionally, defrosting the evaporator according to the target defrosting strategy includes: When the target defrosting strategy is the fan-assisted defrosting strategy, the initial speed of the fan is determined, and the initial speed of the fan is adjusted according to the loading and unloading time of the stored object and / or the peak time of the breathing quotient, so as to use the fan to defrost the evaporator. When the target defrosting strategy is the electrically assisted defrosting strategy, the initial power of the electrically assisted defrosting device is determined, and the initial power of the electrically assisted defrosting device is adjusted according to the loading and unloading time of the stored object and / or the peak time of the breathing quotient, so as to use the electrically assisted defrosting device to defrost the evaporator.

[0010] Optionally, the formula for calculating the degree of carbonation of the frost layer is as follows: ; in, This indicates the degree of carbonation of the frost layer. and Indicates the preset coefficient. This refers to the respiratory quotient. This indicates the ambient humidity.

[0011] Optionally, before determining the degree of carbonation of the frost layer based on the respiratory quotient and the ambient humidity, the method further includes: Obtain the actual concentration value of volatile organic compounds within the target area; Based on the respiratory quotient and the ambient humidity, calculate the theoretical concentration of volatile organic compounds in the target area; Calculate the difference between the actual concentration value and the theoretical concentration value; If the absolute value of the difference is greater than the fourth preset threshold, an automatic detection process is triggered. If the absolute value of the difference is less than or equal to the fourth preset threshold, the step of determining the degree of carbonation of the frost layer based on the respiratory quotient and the ambient humidity is performed.

[0012] Optionally, the formula for calculating the theoretical concentration value is as follows: ; in, This represents the theoretical concentration value. and Indicates the preset coefficient. This refers to the respiratory quotient. This indicates the ambient humidity.

[0013] Secondly, embodiments of this application also provide an evaporator defrosting device, the device comprising: The first acquisition module is used to acquire the respiratory quotient corresponding to the object stored in the target area, as well as the ambient humidity and ambient temperature corresponding to the target area, wherein the target area is an area that is cooled by an evaporator; The first determining module is used to determine the degree of carbonation of the frost layer based on the respiratory quotient and the ambient humidity, and to determine the temperature fluctuation rate in the target area based on the ambient temperature. The second determining module is used to determine a target defrosting strategy based on the degree of carbonation of the frost layer and the temperature fluctuation rate, wherein the target defrosting strategy is a defrosting strategy that matches the degree of carbonation of the frost layer and the temperature fluctuation rate among a plurality of defrosting strategies. A defrosting module is used to defrost the evaporator according to the target defrosting strategy.

[0014] Thirdly, this application also provides a cold storage refrigeration system, the system including an evaporator, a sensing device, and the evaporator defrosting device described in the second aspect; Both the evaporator and the sensing device are connected to the evaporator defrosting device. The sensing device is used to collect the respiratory quotient corresponding to the object stored in the target area, as well as the ambient humidity and ambient temperature corresponding to the target area, and send the respiratory quotient, the ambient humidity and the ambient temperature to the evaporator defrosting device, wherein the target area is an area that uses the evaporator for cooling; The evaporator defrosting device is used to determine the degree of carbonation of the frost layer based on the breathing quotient and the ambient humidity, and to determine the temperature fluctuation rate in the target area based on the ambient temperature; to determine a target defrosting strategy based on the degree of carbonation of the frost layer and the temperature fluctuation rate, wherein the target defrosting strategy is a defrosting strategy that matches the degree of carbonation of the frost layer and the temperature fluctuation rate among multiple defrosting strategies; and to defrost the evaporator according to the target defrosting strategy.

[0015] Fourthly, embodiments of this application also provide a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the evaporator defrosting method described in the first aspect.

[0016] Compared with the prior art, the technical solution provided in this application has the following advantages: The method provided in this application obtains the respiration quotient corresponding to the object stored in the target area, as well as the ambient humidity and ambient temperature of the target area, wherein the target area is an area refrigerated using an evaporator; based on the respiration quotient and the ambient humidity, the degree of carbonation of the frost layer is determined, and based on the ambient temperature, the temperature fluctuation rate of the target area is determined; based on the degree of carbonation of the frost layer and the temperature fluctuation rate, a target defrosting strategy is determined, wherein the target defrosting strategy is a defrosting strategy that matches the degree of carbonation of the frost layer and the temperature fluctuation rate among multiple defrosting strategies; and the evaporator is defrosted according to the target defrosting strategy. Through the above method, the degree of carbonation of the frost layer and the temperature fluctuation rate of the target area can be comprehensively determined based on the respiration quotient corresponding to the object stored in the target area, as well as the ambient humidity and ambient temperature of the target area. Furthermore, based on the degree of carbonation of the frost layer and the temperature fluctuation rate of the target area, the defrosting strategy can be dynamically adjusted, so that system energy consumption and energy efficiency can be considered simultaneously during the evaporator defrosting process, resulting in energy-saving effects for the cold storage refrigeration system. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] One embodiment or practice is illustrated by way of example with the corresponding pictures in the accompanying drawings. These illustrative descriptions do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0020] Figure 1 A schematic flowchart of an evaporator defrosting method provided in an embodiment of this application; Figure 2 A schematic flowchart illustrating another evaporator defrosting method provided in this application embodiment; Figure 3 This is a schematic diagram of the structure of an evaporator defrosting device provided in an embodiment of this application; Figure 4 This is a schematic diagram of a cold storage refrigeration system provided in an embodiment of this application. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0023] To address the issue that evaporator defrosting methods in related technologies typically rely on single parameters such as frost thickness or temperature, which cannot simultaneously address system energy consumption and efficiency, this application provides an evaporator defrosting method, apparatus, cold storage refrigeration system, and readable storage medium that can simultaneously address the issues of system energy consumption and efficiency.

[0024] See Figure 1 , Figure 1 This is a schematic flowchart illustrating an evaporator defrosting method provided in an embodiment of this application. Figure 1 As shown, the evaporator defrosting method may include the following steps: Step S101: Obtain the respiratory quotient corresponding to the object stored in the target area, as well as the ambient humidity and ambient temperature corresponding to the target area, wherein the target area is the area that uses an evaporator for cooling.

[0025] Specifically, the aforementioned target area refers to areas requiring evaporator refrigeration, such as the interior of a cold storage facility. The aforementioned stored items refer to goods capable of respiration, such as vegetables and fruits. The aforementioned respiratory quotient refers to the ratio of carbon dioxide produced to oxygen consumed during the respiration process of the stored items.

[0026] When obtaining the respiratory quotient corresponding to the object stored in the target area, a carbon dioxide (CO2) / oxygen (O2) composite sensor can be used to collect and monitor the rate of change of CO2 concentration and O2 concentration in the target area in real time. Then, based on the rate of change of CO2 concentration and O2 concentration, the respiratory quotient corresponding to the object is calculated using the following formula: ; in, This indicates the respiratory quotient corresponding to the stored object. Indicates time The change in CO2 concentration within the space, Indicates the rate of change of CO2 concentration. Indicates time The change in O2 concentration within the space, This represents the rate of change in O2 concentration.

[0027] The aforementioned ambient humidity can be obtained in real time using a humidity sensor. The aforementioned ambient temperature can be obtained in real time using a temperature sensor. As an optional implementation, the carbon dioxide (CO2) / oxygen (O2) composite sensor, humidity sensor, and temperature sensor can be installed in the return air duct to collect the CO2 concentration, O2 concentration, air humidity, and air temperature of the air in the return air path in real time.

[0028] Step S102: Determine the degree of carbonation of the frost layer based on the respiratory quotient and ambient humidity, and determine the temperature fluctuation rate in the target area based on the ambient temperature.

[0029] Specifically, the degree of carbonation of the aforementioned frost layer refers to the concentration of carbonate ions in the frost layer. This concentration is inversely proportional to the frost melting point; that is, the higher the degree of carbonation, the lower the melting point and the easier the frost melts; conversely, the lower the degree of carbonation, the higher the melting point and the more difficult the frost melts. When the stored object is metabolically active (e.g., RQ > 0.8), respiration releases a large amount of water vapor, leading to an increase in relative humidity in the target area. The air in the target area directly contacts the evaporator, and the high-humidity air carries CO2 (dissolved in water to form H2CO3) into the evaporator. When the evaporator fin temperature is ≤ 0℃, a frost layer forms. At this time, the CO2 dissolved in the high-humidity air comes into contact with the frost layer (H2O), and the following reaction occurs: CO2 + H2O → H2CO3; H2CO3→ H + + HCO3 - ; Carbonate ions in the frost layer can disrupt the crystal lattice, reducing its stability and thus lowering its melting point.

[0030] When determining the degree of carbonation of the frost layer, the relationship between the degree of carbonation of the frost layer and the respiratory quotient and ambient humidity can be obtained by fitting the measured data first. Then, based on the fitted relationship and the currently obtained respiratory quotient and ambient humidity, the current degree of carbonation of the frost layer can be calculated.

[0031] The aforementioned temperature fluctuation rate refers to the magnitude of temperature change within the target area. It can be calculated using the following formula after collecting the maximum and minimum ambient temperature values ​​over a time interval Δt using a temperature sensor: ; in, Indicates temperature fluctuation rate. This represents the maximum ambient temperature over time Δt. This represents the minimum ambient temperature over a time interval Δt. Indicates the data collection duration.

[0032] Step S103: Based on the degree of carbonation and temperature fluctuation of the frost layer, determine the target defrosting strategy, wherein the target defrosting strategy is the defrosting strategy that matches the degree of carbonation and temperature fluctuation of the frost layer among multiple defrosting strategies.

[0033] Specifically, the aforementioned target defrosting strategy can be a natural defrosting strategy, a fan-assisted defrosting strategy, or an electric heating-assisted defrosting strategy. Among them, a natural defrosting strategy refers to a defrosting strategy that does not rely on any auxiliary defrosting device (such as a fan or an electric heating device); a fan-assisted defrosting strategy refers to a strategy that requires the use of a fan for defrosting; and an electric heating-assisted defrosting strategy refers to a strategy that requires the use of an electric heating device for defrosting.

[0034] When determining the target defrosting strategy, it can be based on the degree of carbonation of the frost layer and the temperature fluctuation rate. Specifically, the degree of carbonation of the frost layer and the temperature fluctuation rate can be compared with corresponding preset thresholds to determine the intervals in which the degree of carbonation of the frost layer and the temperature fluctuation rate fall. Then, the target defrosting strategy is determined by combining the correspondence between these two intervals and the defrosting strategy. Alternatively, the degree of carbonation of the frost layer can be compared with the corresponding preset thresholds to determine the interval in which the degree of carbonation of the frost layer falls. When the degree of carbonation of the frost layer is greater than a certain upper threshold or less than a certain lower threshold, the target defrosting strategy for the corresponding interval is determined. When the degree of carbonation of the frost layer is less than or equal to a certain upper threshold and greater than or equal to a certain lower threshold, the temperature fluctuation rate is further determined based on the temperature fluctuation rate.

[0035] Step S104: Defrost the evaporator according to the target defrosting strategy.

[0036] After determining the target defrosting strategy, the evaporator can be defrosted according to the target defrosting strategy. For example, when the target defrosting strategy is a natural defrosting strategy, no auxiliary defrosting devices such as fans or electric heating devices are activated, allowing the frost layer to melt naturally at the normal operating temperature of the cold storage refrigeration system. When the target defrosting strategy is a fan-assisted defrosting strategy, the fan is activated for defrosting. When the target defrosting strategy is an electric heating-assisted defrosting strategy, the electric heating device is activated for defrosting.

[0037] Using the above method, the carbonation degree of the frost layer and the temperature fluctuation rate in the target area can be comprehensively determined based on the respiratory quotient of the object stored in the target area, as well as the ambient humidity and temperature in the target area. Then, based on the carbonation degree of the frost layer and the temperature fluctuation rate in the target area, the target defrosting strategy can be dynamically adjusted, so that the system energy consumption and energy efficiency can be taken into account at the same time during the defrosting process of the evaporator.

[0038] In an optional embodiment, step S103 above, determining the target defrosting strategy based on the degree of carbonation and temperature fluctuation rate of the frost layer, includes: When the carbonation degree of the frost layer is greater than the first preset threshold, the natural defrosting strategy is determined as the target defrosting strategy. The natural defrosting strategy refers to the strategy of defrosting without the aid of an auxiliary defrosting device. When the degree of carbonation of the frost layer is less than or equal to the first preset threshold and greater than or equal to the second preset threshold, the natural defrosting strategy or the fan-assisted defrosting strategy is determined as the target defrosting strategy based on the temperature fluctuation rate, wherein the first preset threshold is greater than the second preset threshold. If the degree of carbonation of the frost layer is less than the second preset threshold, the electric heating-assisted defrosting strategy is determined as the target defrosting strategy.

[0039] Specifically, the first preset threshold and the second preset threshold can be set according to actual needs, and this application embodiment does not impose specific limitations. As an optional implementation, the first preset threshold can be 30%, and the second preset threshold can be 20%.

[0040] When determining the target defrosting strategy based on the degree of carbonation of the frost layer and the temperature fluctuation rate, the degree of carbonation of the frost layer can be compared with the first preset threshold and the second preset threshold respectively. If the degree of carbonation of the frost layer is greater than the first preset threshold (e.g., C > 30%), it means that the degree of carbonation of the frost layer is high and the frost melting point is low. The frost layer can melt naturally at the normal operating temperature of the cold storage refrigeration system, without the need for a fan / electric heating device to assist defrosting. Therefore, the natural defrosting strategy can be determined as the target defrosting strategy.

[0041] If the degree of carbonation of the frost layer is less than or equal to the first preset threshold and greater than or equal to the second preset threshold (e.g., 30% ≥ C ≥ 20%), it indicates that the degree of carbonation of the frost layer is moderate and the frost melting point is moderate. At this time, further judgment can be made based on the temperature fluctuation rate, and the natural defrosting strategy or the fan-assisted defrosting strategy can be determined as the target defrosting strategy.

[0042] If the degree of carbonation of the frost layer is less than the second preset threshold (e.g., C < 20%), it indicates that the degree of carbonation of the frost layer is low, the frost melting point is high, the natural melting efficiency of the frost layer is low, and electric heating is required to assist in melting. Therefore, the electric heating-assisted defrosting strategy can be determined as the target defrosting strategy.

[0043] By using the above method, the effect of the carbonation degree of the frost layer on defrosting can be given priority, so that defrosting can be carried out without the aid of an auxiliary defrosting device when the frost layer can melt naturally, thereby reducing the system energy consumption. When the frost layer cannot melt naturally, defrosting can be carried out with the aid of an auxiliary defrosting device, thereby ensuring the optimal system energy efficiency. This achieves the effect of simultaneously taking into account system energy consumption and energy efficiency during the defrosting process of the evaporator.

[0044] In an optional embodiment, the above steps, based on temperature fluctuation rate, determine the natural defrosting strategy or the fan-assisted defrosting strategy as the target defrosting strategy, including: Compare the temperature fluctuation rate with a third preset threshold; When the temperature fluctuation rate is greater than the third preset threshold, the fan-assisted defrosting strategy is determined as the target defrosting strategy; If the temperature fluctuation rate is less than or equal to the third preset threshold, the natural defrosting strategy will be determined as the target defrosting strategy.

[0045] Specifically, the aforementioned third preset threshold can be set according to actual needs, and this application embodiment does not impose specific limitations. As an optional implementation, the aforementioned third preset threshold can be 0.5℃ / min. The aforementioned third preset threshold can be a critical threshold obtained based on measured data. When this value is exceeded, it is necessary to trigger fan-assisted defrosting; when this value is not exceeded, it is not necessary to trigger fan-assisted defrosting.

[0046] Due to temperature fluctuation The larger the temperature difference, the greater the instantaneous temperature difference between the air and the evaporator fins. This causes a surge in the rate of water vapor sublimation (frost formation). Since the cold storage refrigeration system cannot quickly raise the fin temperature to accelerate melting, the frost formation rate exceeds the frost melting rate, leading to rapid frost accumulation. Temperature fluctuation rate The smaller the temperature difference, the smaller the instantaneous temperature difference between the air and the evaporator fins, and the slower the rate of water vapor sublimation (frost formation). Therefore, the rate of frost formation is less than the rate of frost melting.

[0047] When determining the target defrosting strategy based on temperature volatility, the temperature volatility can first be compared with a third preset threshold. If the temperature volatility is greater than the third preset threshold (e.g., ...), the defrosting strategy will be determined based on the temperature volatility. If the temperature fluctuation rate is greater than 0.5℃ / min, it indicates rapid frost formation (e.g., the instant a door is opened). The frost formation rate is greater than the melting rate, requiring a low-speed fan to assist defrosting and prevent energy consumption spikes due to high frost adhesion. Therefore, a fan-assisted defrosting strategy can be defined as the target defrosting strategy. If the temperature fluctuation rate is less than or equal to the third preset threshold (e.g., ...), then... If the temperature is ≤0.5℃ / min, it means that the frost layer forms slowly, and the rate of frost formation is less than the rate of frost melting. Therefore, no assisted defrosting is needed, and the natural defrosting strategy can be determined as the target defrosting strategy.

[0048] By using the above method, the formation rate and melting rate of frost can be determined based on the temperature fluctuation rate, thereby determining whether it is necessary to trigger the fan to assist defrosting, achieving the effect of simultaneously considering system energy consumption and energy efficiency during the evaporator defrosting process.

[0049] In an optional embodiment, step S104, defrosting the evaporator according to the target defrosting strategy, includes: When the target defrosting strategy is a fan-assisted defrosting strategy, the initial speed of the fan is determined, and the initial speed of the fan is adjusted according to the loading and unloading time of the stored object and / or the peak time of the breathing quotient, so as to use the fan to defrost the evaporator. When the target defrosting strategy is an electrically assisted defrosting strategy, the initial power of the electric heating device is determined, and the initial power of the electric heating device is adjusted according to the loading and unloading time of the stored object and / or the peak time of the breathing quotient, so as to use the electric heating device to defrost the evaporator.

[0050] Specifically, when the target defrosting strategy is a fan-assisted defrosting strategy, the initial fan speed can be determined by comprehensively considering the reference speed value and the degree of carbonation of the frost layer. The calculation formula is as follows: ; in, This indicates the initial rotational speed of the fan. This indicates a reference speed value, such as 750 rpm. Indicates the preset coefficient. Indicates the degree of carbonation of the frost layer. and This indicates a preset constant. , and This can be obtained by fitting historical measured data, as an optional implementation method. This represents the sensitivity coefficient of the fan speed to changes in C, and its value can be 0.5; This indicates the natural melting threshold of the frost layer (C>30% requires no additional defrosting), and its value can be 30%. This is the upper limit of the reference range for the degree of carbonation C of the frost layer, which can be 40% to ensure that the formula remains effective in extreme cases.

[0051] After determining the initial fan speed, it can be adjusted based on the loading and unloading time of the stored items to defrost the evaporator. Specifically, a predictive model can be trained based on historical loading and unloading data of the cold storage facility. This trained model can then identify the daily loading and unloading time (e.g., 10:00 ± 0.5 hours) and begin adjusting the fan speed a preset time (e.g., 1 hour) before the loading and unloading time. This can be achieved using the following formula: ; in, This indicates the adjusted fan speed. Indicates the preset coefficient. This indicates the time remaining since the loading / unloading time. This indicates the preset duration, such as 1 hour. ≤ . This indicates the current fan speed, given a preset time (e.g., 1 hour) before the loading / unloading time. equal to the initial speed of the fan . This can be obtained by fitting historical measured data, as an optional implementation method. The value can be 0.3. Based on the above formula, the fan speed can be adjusted starting at a preset time (e.g., 1 hour) before loading and unloading. It can automatically update and recalculate the adjusted fan speed every 5 minutes. .

[0052] The reason for reducing the fan speed is that when the cold storage is opened for loading and unloading goods, the air humidity inside the cold storage increases, which leads to an increase in the carbonation degree (C) of the frost layer, thereby lowering the frost melting point and improving the efficiency of natural frost melting. Therefore, the system energy consumption can be reduced by reducing the fan speed in advance.

[0053] After determining the initial fan speed, it can be adjusted based on the peak time of the breathing quotient (RQ) to defrost the evaporator. Specifically, when the loading / unloading time coincides with the peak time of the RQ, the RQ is higher and the carbonation degree (C) of the frost layer is also higher, making it easier for the frost layer to melt naturally. Therefore, the fan speed can be reduced more significantly, and the preset coefficient can be increased. For example, increasing it from 0.3 to 0.4 to further reduce system energy consumption.

[0054] When the target defrosting strategy is a fan-assisted defrosting strategy, the initial power of the electric heating device can be determined by comprehensively considering the power reference value and the degree of carbonation of the frost layer. The calculation formula is as follows: ; in, Indicates the initial power of the electric heating device. This indicates a power reference value, such as 1.2 kW. Indicates the preset coefficient. Indicates the degree of carbonation of the frost layer. and This indicates a preset constant. , and This can be obtained by fitting historical measured data, as an optional implementation method. The sensitivity coefficient of the electric heating device's power to changes in C can be 0.4. This indicates the natural melting threshold of the frost layer (C>30% requires no additional defrosting), and its value can be 30%. This is the upper limit of the reference range for the degree of carbonation C of the frost layer, which can be 40% to ensure the formula remains valid even in extreme cases. For example, assuming C = 20%, =0.4, =30%, =40%, =1.2kW, then .

[0055] After determining the initial power of the electric heating device, it can be adjusted based on the loading and unloading time of the stored items to defrost the evaporator. Specifically, a prediction model can be trained based on historical loading and unloading data of the cold storage. This trained model can then identify the daily loading and unloading time (e.g., 10:00 ± 0.5 hours) and begin adjusting the power of the electric heating device a preset time (e.g., 1 hour) before the loading and unloading time. This can be achieved using the following formula: ; in, This indicates the adjusted power of the electric heating device. Indicates the preset coefficient. This indicates the time remaining since the loading / unloading time. This indicates the preset duration, such as 1 hour. ≤ . This indicates the current power of the electric heating device, when preset for a duration (e.g., 1 hour) before loading / unloading. equal to the initial power of the electric heating device . This can be obtained by fitting historical measured data, as an optional implementation method. The value can be 0.2. Based on the above formula, the power of the electric heating device can be adjusted starting from a preset time (e.g., 1 hour) before loading and unloading. It can automatically update every 5 minutes, recalculating the adjusted power of the electric heating device. .

[0056] After determining the initial power of the electric heating device, it can be adjusted based on the peak time of the respiratory quotient (RQ) to defrost the evaporator. Specifically, when the loading / unloading time coincides with the peak time of the RQ, the RQ is higher and the carbonation degree (C) of the frost layer is also higher, making it easier for the frost layer to melt naturally. Therefore, the power of the electric heating device can be adjusted more significantly, and the preset coefficient can be increased. For example, increasing it from 0.2 to 0.25 can further reduce system energy consumption.

[0057] For example, when the loading / unloading time window (e.g., 9:30–10:30) overlaps with the peak time window of the respiratory quotient (e.g., 09:00–11:00) (9:30 < 11:00 and 10:30 > 09:00), the coefficients can be optimized. =0.25), to maximize energy savings.

[0058] It should be noted that the initial speed of the fan or the initial power of the electric heating device can be adjusted independently based on the loading and unloading time of the stored object; the initial speed of the fan or the initial power of the electric heating device can also be adjusted independently based on the peak time of the breathing quotient; furthermore, the initial speed of the fan or the initial power of the electric heating device can be adjusted based on the loading and unloading time of the stored object and the peak time of the breathing quotient. This application embodiment does not impose specific limitations on these adjustments. The aforementioned preset coefficients... It must be greater than the preset coefficient. Because the fan actively blows air, it is more sensitive to disturbances caused by opening the door and needs to be pre-adjusted earlier and more significantly to avoid ineffective operation. In contrast, the electric heater is an auxiliary melting device, which has a slow response and high energy consumption, and therefore does not require significant reduction in temperature.

[0059] By using the above method, the fan speed or the power of the electric heating device can be dynamically adjusted according to the loading and unloading time of the stored object and / or the peak time of the respiration quotient, thereby ensuring effective defrosting while minimizing system energy consumption.

[0060] In an optional embodiment, the formula for calculating the degree of carbonation of the frost layer is as follows: ; in, Indicates the degree of carbonation of the frost layer. and Indicates the preset coefficient. Indicates respiratory quotient. Indicates ambient humidity.

[0061] Specifically, the above and It can be obtained by fitting historical measured data, and they respectively represent and The contribution weight to the degree of carbonation. As an optional implementation, It can be 0.25. It can be 0.15. Of course, as another optional implementation, the above formula can be simply modified, such as by adding a certain preset constant, to calculate the degree of carbonation of the frost layer.

[0062] In this way, we can obtain the respiratory quotient. and ambient humidity Then, substitute its value into the above formula to accurately calculate the degree of carbonation of the frost layer. This facilitates the determination of the target defrosting strategy based on the degree of carbonation and temperature fluctuation of the frost layer.

[0063] In an optional embodiment, before step S102 above, determining the degree of carbonation of the frost layer based on the respiratory quotient and ambient humidity, the method further includes: Obtain the actual concentration values ​​of volatile organic compounds within the target area; Based on the respiratory quotient and ambient humidity, calculate the theoretical concentration of volatile organic compounds in the target area; Calculate the difference between the actual concentration value and the theoretical concentration value; If the absolute value of the difference is greater than the fourth preset threshold, an automatic detection process is triggered. If the absolute value of the difference is less than or equal to the fourth preset threshold, the step of determining the degree of carbonation of the frost layer based on the respiratory quotient and ambient humidity is performed.

[0064] Specifically, the actual concentration values ​​of the aforementioned volatile organic compounds (VOCs) can be obtained in real time by an electrochemical VOCs sensor installed in the return air duct. The theoretical concentration values ​​of the aforementioned volatile organic compounds can be calculated based on the respiratory quotient and ambient humidity.

[0065] After obtaining the actual and theoretical concentration values ​​of volatile organic compounds, the difference between them can be calculated. If the absolute value of this difference is greater than a fourth preset threshold, it indicates a large calculation error, and an automatic detection process can be triggered to reduce the error. If the absolute value of the difference is less than or equal to the fourth preset threshold, it indicates a small calculation error, and the step of determining the degree of carbonation of the frost layer based on the respiratory quotient and ambient humidity can be directly executed. The fourth preset threshold can be set according to actual needs, such as 10%, and this embodiment does not impose a specific limitation.

[0066] In this way, the accuracy of the calculated carbonation degree C of the frost layer can be verified by comparing the actual concentration value of volatile organic compounds with the theoretical concentration value. If it is not accurate enough, the system self-check process is triggered; if it is accurate, the calculation result of the carbonation degree C of the frost layer is used for subsequent processing to improve the accuracy of the target defrosting strategy.

[0067] In an optional embodiment, the formula for calculating the theoretical concentration value is as follows: ; in, This represents the theoretical concentration value. and Indicates the preset coefficient. Indicates respiratory quotient. Indicates ambient humidity.

[0068] Specifically, the above and It can be obtained by fitting historical measured data, and they respectively represent and The contribution weight to the concentration of volatile organic compounds. As an optional implementation, It can be 0.30. It can be 0.05. Of course, as another optional implementation, the above formula can be simply modified, such as by adding a certain preset constant, to calculate the theoretical concentration value of volatile organic compounds.

[0069] In this way, we can obtain the respiratory quotient. and ambient humidity Then, substitute its value into the above formula to accurately calculate the theoretical concentration of volatile organic compounds, which will facilitate subsequent determination of whether to trigger the automatic detection process based on the theoretical and actual concentration values ​​of volatile organic compounds.

[0070] In an optional embodiment, the evaporator defrosting process provided in this application is as follows: Figure 2 As shown, it specifically includes the following steps: Step S201: Collect data such as the concentration of carbon dioxide (CO2), the concentration of oxygen (O2), the ambient temperature (T), and the ambient humidity (H).

[0071] Step S202: Calculate the respiratory quotient RQ based on the concentration change rate of carbon dioxide (CO2) and oxygen (O2), and calculate the carbonation degree C and the theoretical concentration value V of volatile organic compounds based on the respiratory quotient RQ and the ambient humidity H.

[0072] Step S203: Compare the theoretical concentration value V of volatile organic compounds with the actual concentration value to obtain the error.

[0073] Step S204: If the error is greater than 10%, a system self-test is triggered.

[0074] Step S205: If the error is ≤10%, then determine the degree of carbonation C of the frost layer.

[0075] Step S206: If C > 30%, allow the frost to melt naturally.

[0076] Step S207: If 30% ≥ C ≥ 20%, then determine the magnitude of the temperature fluctuation rate T'.

[0077] If T' ≤ 0.5℃ / min, return to step S206. If T' > 0.5℃ / min, proceed to step S208.

[0078] Step S208: Allow the fan to assist in defrosting.

[0079] Step S209: If C < 20%, then use the electric heating device to assist defrosting.

[0080] Step S210: Adjust the fan speed or the power of the electric heating device according to the loading and unloading time of the stored object and the peak time of the respiration quotient.

[0081] Therefore, this application considers the physical mechanism by which the metabolic characteristics of food (i.e., respiratory quotient RQ) affect the degree of carbonation C of the frost layer through environmental humidity H. This avoids the problem of high system energy consumption caused by activating fans or electric heating devices when the frost layer could melt naturally at the normal operating temperature of the cold storage. Furthermore, by establishing a correlation between temperature fluctuation rate and frost formation rate, it is possible to accurately determine whether fan-assisted defrosting is needed in dynamic scenarios such as cold storage door opening. In addition, by combining the loading and unloading time of stored items and / or the peak time of the respiratory quotient, the high energy consumption during cold storage door opening periods can be addressed, thereby further reducing system energy consumption.

[0082] See Figure 3 , Figure 3 This is a schematic diagram of an evaporator defrosting device provided in an embodiment of this application. Figure 3 As shown, the evaporator defrosting device 300 includes: The first acquisition module 301 is used to acquire the respiratory quotient corresponding to the object stored in the target area, as well as the ambient humidity and ambient temperature corresponding to the target area, wherein the target area is an area that uses an evaporator for cooling. The first determining module 302 is used to determine the degree of carbonation of the frost layer based on the respiratory quotient and ambient humidity, and to determine the temperature fluctuation rate in the target area based on the ambient temperature. The second determining module 303 is used to determine a target defrosting strategy based on the degree of carbonation and temperature fluctuation rate of the frost layer, wherein the target defrosting strategy is a defrosting strategy that matches the degree of carbonation and temperature fluctuation rate of the frost layer among multiple defrosting strategies. The defrosting module 304 is used to defrost the evaporator according to the target defrosting strategy.

[0083] Furthermore, the second determining module 303 includes: The first determining submodule is used to determine the natural defrosting strategy as the target defrosting strategy when the carbonation degree of the frost layer is greater than the first preset threshold. The natural defrosting strategy refers to the strategy of defrosting without the aid of the auxiliary defrosting device 300. The second determining submodule is used to determine the natural defrosting strategy or the fan-assisted defrosting strategy as the target defrosting strategy based on the temperature fluctuation rate when the degree of carbonation of the frost layer is less than or equal to the first preset threshold and greater than or equal to the second preset threshold. The first preset threshold is greater than the second preset threshold. The third determining submodule is used to determine the electric heating-assisted defrosting strategy as the target defrosting strategy when the degree of carbonation of the frost layer is less than the second preset threshold.

[0084] Furthermore, the second determining submodule includes: A comparison unit is used to compare the temperature fluctuation rate with a third preset threshold. The first determining unit is used to determine the fan-assisted defrosting strategy as the target defrosting strategy when the temperature fluctuation rate is greater than the third preset threshold. The second determining unit is used to determine the natural defrosting strategy as the target defrosting strategy when the temperature fluctuation rate is less than or equal to a third preset threshold.

[0085] Furthermore, the defrosting module 304 includes: The first defrosting submodule is used to determine the initial speed of the fan when the target defrosting strategy is a fan-assisted defrosting strategy, and to adjust the initial speed of the fan according to the loading and unloading time of the stored object and / or the peak time of the breathing quotient, so as to use the fan to defrost the evaporator. The second defrosting submodule is used to determine the initial power of the electric heating device 300 when the target defrosting strategy is an electric heating-assisted defrosting strategy, and to adjust the initial power of the electric heating device 300 according to the loading and unloading time of the stored object and / or the peak time of the breathing quotient, so as to use the electric heating device 300 to defrost the evaporator.

[0086] Furthermore, the formula for calculating the degree of carbonation of the frost layer is as follows: ; in, Indicates the degree of carbonation of the frost layer. and Indicates the preset coefficient. Indicates respiratory quotient. Indicates ambient humidity.

[0087] Furthermore, the evaporator defrosting device 300 also includes: The second acquisition module is used to acquire the actual concentration value of volatile organic compounds in the target area; The first calculation module is used to calculate the theoretical concentration of volatile organic compounds in the target area based on the respiratory quotient and ambient humidity. The second calculation module is used to calculate the difference between the actual concentration value and the theoretical concentration value; The trigger module is used to trigger the automatic detection process when the absolute value of the difference is greater than the fourth preset threshold. The execution module is used to perform a step of determining the degree of carbonation of the frost layer based on the respiratory quotient and ambient humidity when the absolute value of the difference is less than or equal to a fourth preset threshold.

[0088] Furthermore, the formula for calculating the theoretical concentration value is as follows: ; in, This represents the theoretical concentration value. and Indicates the preset coefficient. Indicates respiratory quotient. Indicates ambient humidity.

[0089] It should be noted that the evaporator defrosting device 300 can realize the evaporator defrosting method provided in any of the aforementioned method embodiments and can achieve the same technical effect, which will not be described in detail here.

[0090] See Figure 4 , Figure 4 This is a schematic diagram of a cold storage refrigeration system provided in an embodiment of this application. Figure 4 As shown, the cold storage refrigeration system 400 includes an evaporator 320, a sensing device 310, and the aforementioned evaporator defrosting device 300; Both the evaporator 320 and the sensor 310 are connected to the evaporator defrosting device 300. The sensor 310 is used to collect the respiratory quotient corresponding to the object stored in the target area, as well as the ambient humidity and ambient temperature corresponding to the target area, and send the respiratory quotient, ambient humidity and ambient temperature to the evaporator defrosting device 300, wherein the target area is the area that is cooled by the evaporator 320. The evaporator defrosting device 300 is used to determine the degree of carbonation of the frost layer based on the breathing quotient and ambient humidity, and to determine the temperature fluctuation rate in the target area based on the ambient temperature; based on the degree of carbonation of the frost layer and the temperature fluctuation rate, a target defrosting strategy is determined, wherein the target defrosting strategy is a defrosting strategy that matches the degree of carbonation of the frost layer and the temperature fluctuation rate among multiple defrosting strategies; and the evaporator 320 is defrosted according to the target defrosting strategy.

[0091] This cold storage refrigeration system can dynamically adjust the defrosting strategy based on the degree of carbonation of the frost layer and the temperature fluctuation rate in the target area, so that the defrosting process can take into account both system energy consumption and energy efficiency, thus making the cold storage refrigeration system energy-saving.

[0092] It should be noted that the evaporator defrosting device 300 can realize the evaporator defrosting method provided in any of the aforementioned method embodiments and can achieve the same technical effect, which will not be described in detail here.

[0093] In addition, embodiments of this application also provide a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the evaporator defrosting method provided in any of the foregoing method embodiments.

[0094] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0095] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a general-purpose hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as read-only memory (ROM), random access memory (RAM), magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0096] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0097] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A defrosting method for an evaporator, characterized in that, The method includes: Obtain the respiratory quotient corresponding to the object stored in the target area, as well as the ambient humidity and ambient temperature corresponding to the target area, wherein the target area is an area that uses an evaporator for cooling; Based on the respiratory quotient and the ambient humidity, the degree of carbonation of the frost layer is determined, and based on the ambient temperature, the temperature fluctuation rate within the target area is determined. Based on the degree of carbonation of the frost layer and the temperature fluctuation rate, a target defrosting strategy is determined, wherein the target defrosting strategy is a defrosting strategy that matches the degree of carbonation of the frost layer and the temperature fluctuation rate among multiple defrosting strategies. The evaporator is defrosted according to the target defrosting strategy.

2. The method according to claim 1, characterized in that, The determination of the target defrosting strategy based on the degree of carbonation of the frost layer and the temperature fluctuation rate includes: When the degree of carbonation of the frost layer is greater than a first preset threshold, the natural defrosting strategy is determined as the target defrosting strategy, wherein the natural defrosting strategy refers to a strategy of defrosting without the aid of an auxiliary defrosting device. When the degree of carbonation of the frost layer is less than or equal to the first preset threshold and greater than or equal to the second preset threshold, the natural defrosting strategy or the fan-assisted defrosting strategy is determined as the target defrosting strategy based on the temperature fluctuation rate, wherein the first preset threshold is greater than the second preset threshold. If the degree of carbonation of the frost layer is less than the second preset threshold, the electric heating-assisted defrosting strategy is determined as the target defrosting strategy.

3. The method according to claim 2, characterized in that, The step of determining the natural defrosting strategy or the fan-assisted defrosting strategy as the target defrosting strategy based on the temperature fluctuation rate includes: The temperature fluctuation rate is compared with a third preset threshold. If the temperature fluctuation rate is greater than the third preset threshold, the fan-assisted defrosting strategy will be determined as the target defrosting strategy. If the temperature fluctuation rate is less than or equal to the third preset threshold, the natural defrosting strategy is determined as the target defrosting strategy.

4. The method according to claim 3, characterized in that, The defrosting of the evaporator according to the target defrosting strategy includes: When the target defrosting strategy is the fan-assisted defrosting strategy, the initial speed of the fan is determined, and the initial speed of the fan is adjusted according to the loading and unloading time of the stored object and / or the peak time of the breathing quotient, so as to use the fan to defrost the evaporator. When the target defrosting strategy is the electrically assisted defrosting strategy, the initial power of the electrically assisted defrosting device is determined, and the initial power of the electrically assisted defrosting device is adjusted according to the loading and unloading time of the stored object and / or the peak time of the breathing quotient, so as to use the electrically assisted defrosting device to defrost the evaporator.

5. The method according to claim 1, characterized in that, The formula for calculating the degree of carbonation of the frost layer is as follows: ； in, This indicates the degree of carbonation of the frost layer. and Indicates the preset coefficient. This refers to the respiratory quotient. This indicates the ambient humidity.

6. The method according to claim 1, characterized in that, Before determining the degree of carbonation of the frost layer based on the respiratory quotient and the ambient humidity, the method further includes: Obtain the actual concentration value of volatile organic compounds within the target area; Based on the respiratory quotient and the ambient humidity, calculate the theoretical concentration of volatile organic compounds in the target area; Calculate the difference between the actual concentration value and the theoretical concentration value; If the absolute value of the difference is greater than the fourth preset threshold, an automatic detection process is triggered. If the absolute value of the difference is less than or equal to the fourth preset threshold, the step of determining the degree of carbonation of the frost layer based on the respiratory quotient and the ambient humidity is performed.

7. The method according to claim 6, characterized in that, The formula for calculating the theoretical concentration value is as follows: ； in, This represents the theoretical concentration value. and Indicates the preset coefficient. This refers to the respiratory quotient. This indicates the ambient humidity.

8. An evaporator defrosting device, characterized in that, The device includes: The first acquisition module is used to acquire the respiratory quotient corresponding to the object stored in the target area, as well as the ambient humidity and ambient temperature corresponding to the target area, wherein the target area is an area that is cooled by an evaporator; The first determining module is used to determine the degree of carbonation of the frost layer based on the respiratory quotient and the ambient humidity, and to determine the temperature fluctuation rate in the target area based on the ambient temperature. The second determining module is used to determine a target defrosting strategy based on the degree of carbonation of the frost layer and the temperature fluctuation rate, wherein the target defrosting strategy is a defrosting strategy that matches the degree of carbonation of the frost layer and the temperature fluctuation rate among a plurality of defrosting strategies. A defrosting module is used to defrost the evaporator according to the target defrosting strategy.

9. A cold storage refrigeration system, characterized in that, The system includes an evaporator, a sensing device, and the evaporator defrosting device as described in claim 8; Both the evaporator and the sensing device are connected to the evaporator defrosting device. The sensing device is used to collect the respiratory quotient corresponding to the object stored in the target area, as well as the ambient humidity and ambient temperature corresponding to the target area, and send the respiratory quotient, the ambient humidity and the ambient temperature to the evaporator defrosting device, wherein the target area is an area that uses the evaporator for cooling; The evaporator defrosting device is used to determine the degree of carbonation of the frost layer based on the breathing quotient and the ambient humidity, and to determine the temperature fluctuation rate in the target area based on the ambient temperature; to determine a target defrosting strategy based on the degree of carbonation of the frost layer and the temperature fluctuation rate, wherein the target defrosting strategy is a defrosting strategy that matches the degree of carbonation of the frost layer and the temperature fluctuation rate among multiple defrosting strategies; and to defrost the evaporator according to the target defrosting strategy.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the evaporator defrosting method according to any one of claims 1-7.

Images