Defrosting control device, defrosting control method and temperature regulation and control system

Abstract

The invention discloses a defrosting control device, a defrosting control method and a temperature regulation and control system. The defrosting control device comprises an acquisition module, an edge calculation module, a defrosting module and a control module, the defrosting module comprises a plurality of defrosting units arranged on the heat exchange unit; the acquisition module is used for acquiring air pressure difference of the heat exchange unit and temperature field distribution information of a set surface of the heat exchange unit; the edge calculation module is used for determining a critical defrosting threshold value and frost layer thickness distribution information of a set surface according to the wind pressure difference and the temperature field distribution information; the control module is used for determining a target defrosting area according to the frost layer thickness distribution information and the critical defrosting threshold value and controlling the defrosting unit corresponding to the target defrosting area to conduct defrosting. The invention provides a defrosting control device, a defrosting control method and a temperature regulation and control system, which can reduce the defrosting energy consumption, ensure the continuous work of the temperature regulation and control system where a heat exchange unit is located during defrosting, prolong the service life of the temperature regulation and control system and increase the application scene of the temperature regulation and control system.

Description

Technical Field

[0001] The present invention relates to the field of defrosting technology, and in particular to a defrosting control device, a defrosting control method and a temperature control system. Background Art

[0002] When the air source heat pump is heating, the evaporator absorbs heat from the outside air. When the ambient temperature is low and the humidity is high, frost may form on the surface of the evaporator, which will reduce the heat exchange efficiency, so defrosting is required.

[0003] Currently, defrosting is triggered by temperature sensors or time thresholds, which can easily lead to false triggering (defrosting without frost) or delayed defrosting, resulting in energy waste. In addition, the reverse cycle mode is often used for defrosting, and reverse cycle defrosting requires stopping the air source heat pump heating operation, resulting in large indoor temperature fluctuations and poor user experience. In addition, the reverse cycle mode causes the compressor to start and stop frequently, shortening the life of the equipment. Summary of the invention

[0004] The present invention provides a defrost control device, a defrost control method and a temperature control system, which can reduce defrost energy consumption, ensure that the temperature control system where the heat exchange unit is located continues to work during defrosting, and extend the service life of the temperature control system and increase its application scenarios.

[0005] According to one aspect of the present invention, a defrost control device is provided, the defrost control device comprising: a collection module, an edge computing module, a defrost module and a control module;

[0006] The defrost module includes a plurality of defrost units for being arranged on the heat exchange unit;

[0007] The acquisition module is used to collect the wind pressure difference of the heat exchange unit and the temperature field distribution information of the set surface of the heat exchange unit;

[0008] The edge computing module is used to determine a critical defrost threshold and frost thickness distribution information of the set surface according to the wind pressure difference and the temperature field distribution information; wherein the critical defrost threshold includes a thickness threshold, and the thickness threshold is greater than 0;

[0009] The control module is used to determine a target defrost area according to the frost layer thickness distribution information and the critical defrost threshold, and control the defrost unit corresponding to the target defrost area to defrost, wherein the frost layer thickness of the target defrost area is greater than or equal to the thickness threshold.

[0010] Optionally, the collection module is further used to collect the humidity of the environment in which the heat exchange unit is located;

[0011] The edge computing module is also used to determine the frost formation rate of the frost layer on the heat exchange unit according to the wind pressure difference, the temperature field distribution information and the ambient humidity;

[0012] The control module is further configured to determine the operating power of the defrost unit corresponding to the target defrost area according to the frost formation rate of the frost layer.

[0013] Optionally, the edge computing module is specifically used to determine the critical defrost threshold, the actual wind resistance increase rate, and the frost thickness distribution information of the set surface according to the wind pressure difference, the temperature field distribution information, and the ambient humidity; wherein the critical defrost threshold also includes a wind resistance increase rate threshold;

[0014] The control module is specifically used to determine the target defrost area according to the frost layer thickness distribution information and the thickness threshold, and control the defrost unit corresponding to the target defrost area to defrost when the actual wind resistance increase rate is greater than or equal to the wind resistance increase rate threshold.

[0015] Optionally, the control module is further used to control the temperature control system where the heat exchange unit is located to switch to a reverse cycle mode when the area of ​​the target defrost region is greater than or equal to a set area threshold.

[0016] Optionally, the control module is also used to control the frost layer of the heat exchange sub-unit with the thickest frost layer to be the target defrost area when the heat exchange unit includes n heat exchange sub-units, and control the temperature control system of the heat exchange sub-unit with the thickest frost layer to switch to a reverse cycle mode, while ensuring that the temperature control system of at least one of the heat exchange sub-units operates normally.

[0017] Optionally, the plurality of defrost units in the defrost module are arranged in an array on the surface of the heat exchange unit;

[0018] The defrosting unit includes an electric heating wire;

[0019] The area of ​​the defrost unit is less than or equal to a set threshold.

[0020] Optionally, the acquisition module includes a thermal imaging unit and a pressure difference detection unit;

[0021] The thermal imaging unit is disposed on the windward side of the heat exchange unit, and is used to collect the temperature field distribution information of a set surface of the heat exchange unit;

[0022] The pressure difference detection unit is disposed between the air inlet of the heat exchange unit and the air outlet of the heat exchange unit, and the pressure difference detection unit is used to collect the wind pressure difference of the heat exchange unit.

[0023] Optionally, the thermal imaging unit includes an infrared thermal imaging sensor, and the infrared thermal imaging sensor is used to collect the temperature field distribution information of a set surface of the heat exchange unit;

[0024] The pressure difference detection unit includes a pressure difference sensor, and the pressure difference sensor is used to collect the wind pressure difference of the heat exchange unit.

[0025] According to another aspect of the present invention, a defrost control method is provided, and the defrost control method is applied to the defrost control device provided in any embodiment of the present invention;

[0026] The defrost control method comprises:

[0027] The acquisition module acquires the wind pressure difference of the heat exchange unit and the temperature field distribution information of the set surface of the heat exchange unit;

[0028] The edge computing module determines a critical defrost threshold and frost thickness distribution information of the set surface according to the wind pressure difference and the temperature field distribution information; wherein the critical defrost threshold includes a thickness threshold, and the thickness threshold is greater than 0;

[0029] The control module determines a target defrost area according to the frost layer thickness distribution information and the critical defrost threshold, and controls the defrost unit corresponding to the target defrost area to defrost, wherein the frost layer thickness of the target defrost area is greater than or equal to the thickness threshold.

[0030] According to another aspect of the present invention, a temperature control system is provided. The temperature control system includes the defrost control device provided by any embodiment of the present invention.

[0031] An embodiment of the present invention provides a defrost control device, in which an edge computing module is used to determine a critical defrost threshold and frost thickness distribution information of a heat exchange unit according to wind pressure difference and temperature field distribution information collected by an acquisition module, and a control module is used to determine a target defrost area according to the critical defrost threshold and frost thickness distribution information, and to make the frost thickness in the target defrost area greater than or equal to the thickness threshold in the critical defrost threshold, and the thickness threshold is greater than 0, thereby ensuring that a frost-free area is not included in the target defrost area, and the control module is also used to control the defrost unit corresponding to the target defrost area to defrost to remove the frost layer in the target defrost area, thereby ensuring that the heat exchange unit can work normally. The defrost control device provided by an embodiment of the present invention has a built-in defrost module, and does not need to stop the temperature control system where the heat exchange unit is located to defrost, thereby reducing the number of compressor starts and stops and extending the service life of the compressor. The defrost module can defrost the heat exchange unit in time, so as to prevent the heat exchange unit from being unable to work due to too thick frost layer in harsh environments such as high humidity and low temperature, and ensure that the temperature control system where the heat exchange unit is located works normally in a variety of environments. In addition, the control module controls the defrost unit in the defrost module to only defrost the target defrost area, realizing local partition defrosting, avoiding overall defrosting and causing the defrost unit corresponding to the frost-free area to work and increase the power consumption of the defrost module. In summary, the defrost control device provided in the embodiment of the present invention can reduce the defrosting energy consumption, ensure that the temperature control system where the heat exchange unit is located continues to work during defrosting, and extend the service life of the temperature control system and increase its application scenarios.

[0032] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 is a structural schematic diagram of a defrost control device provided according to an embodiment of the present invention;

[0035] Figure 2 is a front structural schematic diagram of a defrost control device provided in an embodiment of the present invention applied to a heat exchange unit;

[0036] Figure 3 is a schematic side structural diagram of a defrost control device provided in an embodiment of the present invention, which is applied to a heat exchange unit;

[0037] Figure 4 It is a flow chart of a defrosting control method provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] Figure 1 is a schematic diagram of a defrost control device according to an embodiment of the present invention, with reference to Figure 1 The defrost control device provided in this embodiment includes: an acquisition module 110, an edge computing module 120, a control module 130 and a defrost module 140; the defrost module 140 includes a plurality of defrost units 141 for being arranged on the heat exchange unit; the acquisition module 110 is used to acquire the wind pressure difference of the heat exchange unit and the temperature field distribution information of the set surface of the heat exchange unit; the edge computing module 120 is used to determine the critical defrost threshold and the frost thickness distribution information of the set surface according to the wind pressure difference and the temperature field distribution information; wherein the critical defrost threshold includes a thickness threshold, and the thickness threshold is greater than 0; the control module 130 is used to determine the target defrost area according to the frost thickness distribution information and the critical defrost threshold, and control the defrost unit 141 corresponding to the target defrost area to defrost, wherein the frost thickness of the target defrost area is greater than or equal to the thickness threshold.

[0041] Specifically, the heat exchange unit may be an evaporator in a temperature control system, or may include evaporators in multiple temperature control systems, that is, the heat exchange unit includes multiple evaporators. The temperature control system may be used to adjust the temperature indoors, in a box, etc. The temperature control system may be an air source heat pump, an air conditioner, or a multi-split system, a multi-split system refers to multiple temperature control systems, and a multi-split system may include multiple evaporators.

[0042] The wind pressure difference of the heat exchange unit refers to the difference between the wind pressure at the air inlet and the wind pressure at the air outlet of the heat exchange unit. The thickening of the frost layer on the surface of the heat exchange unit will affect the change of the wind pressure difference, and the thickening of the frost layer will cause the wind pressure difference to increase. Therefore, the thickness of the frost layer can be determined according to the wind pressure difference. The set surface of the heat exchange unit can be the surface on the windward side of the heat exchange unit, or the surface on the windward side of the heat exchange unit and the surface adjacent to the surface on the windward side, or all the outer surfaces of the heat exchange unit. The temperature field distribution information may include the temperature of each area of ​​the set surface.

[0043] The acquisition module 110 can collect wind pressure difference and temperature field distribution information in real time, and can also collect wind pressure difference and temperature field distribution information once every set time, and the set time can be 10s, 20s, 30s, etc. The acquisition module 110 is connected to the edge computing module 120, and the edge computing module 120 is connected to the control module 130. The acquisition module 110 can send the collected wind pressure difference and temperature field distribution information to the edge computing module 120. The edge computing module 120 determines the critical defrost threshold and frost layer thickness distribution information according to the wind pressure difference and temperature field distribution information sent by the acquisition module 110, and can send the determined critical defrost threshold and frost layer thickness distribution information to the control module 130. The edge computing module 120 can determine a critical defrost threshold and frost layer thickness distribution information each time it receives the wind pressure difference and temperature field distribution information sent by the acquisition module 110, and send the determined critical defrost threshold and frost layer thickness distribution information to the control module 130. The control module 130 can redetermine the target defrost area based on the newly sent critical defrost threshold and frost layer thickness distribution information, thereby avoiding the defrost unit 141 still defrosting when there is no frost in the previous target defrost area, reducing ineffective defrosting and reducing energy consumption.

[0044] The edge computing module 120 can store the wind pressure difference and temperature field distribution information sent by the acquisition module 110. The edge computing module 120 can determine the frost layer position according to the temperature field distribution information. For example, the low temperature area can refer to the area with frost layer. After receiving the wind pressure difference and temperature field distribution information, the edge computing module 120 can determine the frost layer thickness of each area of ​​the set surface through the pre-trained frost layer thickness prediction model, thereby generating frost layer thickness distribution information. The frost layer thickness distribution information includes the frost layer thickness of each area of ​​the set surface, and the frost layer thickness distribution information can be a frost layer thickness distribution map. The edge computing module 120 can also determine the thickness threshold in the critical defrost threshold after determining the frost layer thickness of each area. For example, the thickness threshold can be 3mm. The frost layer thickness in the target defrost area is greater than or equal to the thickness threshold. It can be seen that the thickness threshold can affect the area of ​​the target defrost area. By setting a reasonable thickness threshold, the effect of local defrosting can be achieved.

[0045] The control module 130 is connected to each defrost unit 141, and the control module 130 can individually control the working state of each defrost unit 141. The working states of the defrost units 141 can be different. For example, the control module 130 can control a part of the defrost units 141 to defrost, and can also control another part of the defrost units 141 not to work, that is, not to defrost. Multiple defrost units 141 can be set on one surface or multiple surfaces of the heat exchange unit, and the defrost units 141 can include heating wires.

[0046] The control module 130 can determine the area that needs to be defrosted according to the frost layer thickness distribution information and the thickness threshold, that is, determine the target defrost area. The control module 130 can use the area where the frost layer thickness is greater than or equal to the thickness threshold as the target defrost area. The frost layer thickness in the target defrost area is greater than or equal to the thickness threshold. It can be seen that the target defrost area does not include the area without frost layer. Therefore, the control module 130 does not need to control the defrost unit 141 corresponding to the area without frost layer to defrost, and only defrosts the area that needs to be defrosted to achieve zoned defrosting, thereby avoiding ineffective defrosting and reducing the power consumption of the defrost module 140. The target defrost area can be the area with the thickest frost layer thickness, or it can be all areas with frost layers. When the target defrost area is large, the target defrost area can correspond to multiple defrost units 141. The multiple defrost units 141 corresponding to the target defrost area refer to the defrost units 141 in the defrost module 140 that are closer to the target defrost area, which can speed up the defrost rate. The control module 130 in this embodiment performs defrosting by controlling the defrosting unit 141, without stopping the temperature control system where the heat exchange unit is located for defrosting, thereby avoiding the loss of life caused by frequent starting and stopping of the compressor.

[0047] If the heat exchange unit is not defrosted in time, the heat exchange unit will not work in high humidity (RH>80%) and low temperature (below -15°C), and the temperature control system where the heat exchange unit is located cannot be defrosted through the reverse cycle mode. This embodiment is provided with a defrost module 140, which can control the defrost unit 141 in the defrost module 140 to defrost in time without defrosting through the temperature control system, thereby ensuring that the temperature control system where the heat exchange unit is located can still work in harsh environments such as high humidity and low temperature, and increasing the application scenarios of the temperature control system.

[0048] The present embodiment provides a defrost control device, in which the edge computing module is used to determine the critical defrost threshold and the frost thickness distribution information of the heat exchange unit according to the wind pressure difference and temperature field distribution information collected by the collection module, and the control module is used to determine the target defrost area according to the critical defrost threshold and the frost thickness distribution information, and make the frost thickness in the target defrost area greater than or equal to the thickness threshold in the critical defrost threshold, and the thickness threshold is greater than 0, so as to ensure that the target defrost area does not include a frost-free area. The control module is also used to control the defrost unit corresponding to the target defrost area to defrost to remove the frost layer in the target defrost area, so as to ensure that the heat exchange unit can work normally. The defrost control device provided in the present embodiment has its own defrost module, and does not need to stop the temperature control system where the heat exchange unit is located to defrost, thereby reducing the number of starts and stops of the compressor and extending the service life of the compressor. The defrost module can defrost the heat exchange unit in time, so as to prevent the heat exchange unit from being unable to work due to too thick frost layer in harsh environments such as high humidity and low temperature, and ensure that the temperature control system where the heat exchange unit is located works normally in various environments. In addition, the control module controls the defrost unit in the defrost module to only defrost the target defrost area, realize local partition defrosting, and avoid overall defrosting, which makes the defrost unit corresponding to the frost-free area work and increases the power consumption of the defrost module. In summary, the defrost control device provided in this embodiment can reduce the defrosting energy consumption, ensure that the temperature control system where the heat exchange unit is located continues to work during defrosting, and extend the service life of the temperature control system and increase its application scenarios.

[0049] Optionally, the collection module is also used to collect the ambient humidity of the heat exchange unit; the edge computing module is also used to determine the frost formation rate of the frost layer on the heat exchange unit based on the wind pressure difference, temperature field distribution information and ambient humidity; the control module is also used to determine the working power of the defrost unit corresponding to the target defrost area based on the frost formation rate.

[0050] Specifically, when the ambient humidity is high, the frost formation rate is generally high. The wind pressure difference and the temperature of the surface of the heat exchange unit will also affect the frost formation rate. For example, when the surface temperature of the frost layer of the heat exchange unit is low, the frost formation rate is generally fast. The greater the wind pressure difference, the faster the frost formation rate. In this embodiment, an edge computing module is provided to determine the frost formation rate of the frost layer on the heat exchange unit according to the wind pressure difference, the temperature field distribution information and the ambient humidity, so as to improve the accuracy of the determined frost formation rate.

[0051] The greater the frost formation rate, the thicker the frost layer will be, so timely and rapid defrosting is required. The control module determines the working power of the defrost unit according to the frost formation rate. The greater the working power, the more heat the defrost unit generates, and the faster the defrost rate of the defrost unit. Exemplarily, when the frost formation rate is low, the control module can control the defrost unit to defrost with a lower working power, thereby reducing energy consumption. When the frost formation rate is high, the control module can control the defrost unit to defrost with a higher working power, thereby speeding up the defrost rate and preventing the heat exchange unit from being unable to work normally due to an excessively thick frost layer.

[0052] Optionally, the edge computing module is specifically used to determine the critical defrost threshold, the actual wind resistance rise rate, and the frost thickness distribution information of a set surface based on the wind pressure difference, the temperature field distribution information and the ambient humidity; wherein the critical defrost threshold also includes a wind resistance rise rate threshold; the control module is specifically used to determine the target defrost area based on the frost thickness distribution information and the thickness threshold, and when the actual wind resistance rise rate is greater than or equal to the wind resistance rise rate threshold, control the defrost unit corresponding to the target defrost area to defrost.

[0053] Specifically, the critical defrost threshold determined by the edge computing module in this embodiment includes a thickness threshold and a wind resistance rise rate threshold. When the frost layer thickness in each area in the frost layer thickness distribution information is small but the actual wind resistance rise rate is high, it means that the frost layer on the surface of the heat exchange unit will increase in a short time. In order to ensure timely defrosting, the edge computing module can set a lower thickness threshold and a suitable wind resistance rise rate threshold to ensure that the defrost unit can be defrosted in time when the actual wind resistance rise rate is high, thereby ensuring the stability of the heat exchange unit's continuous normal operation.

[0054] The edge computing module determines the frost thickness distribution information based on the wind pressure difference, temperature field distribution information and ambient humidity. Combining multiple parameters can ensure the accuracy of the determined frost thickness distribution information, thereby ensuring that the defrost module can defrost in a timely and accurate manner.

[0055] The edge computing module can be used to determine the actual wind resistance rise rate based on the wind pressure difference. The actual wind resistance rise rate can reflect the thickness of the frost layer on the surface of the heat exchange unit. A high actual wind resistance rise rate indicates a thicker frost layer. When the actual wind resistance rise rate is greater than the wind resistance rise rate threshold, exemplarily, the wind resistance rise rate threshold can be 15%. The control module can control the defrost unit to defrost, thereby avoiding the heat exchange unit from being unable to work normally due to the thick frost layer on the surface.

[0056] When the ambient humidity is relatively high, it means that the frost layer is thicker after a short time. The edge computing module determines the wind resistance rising threshold in the critical defrost threshold based on the ambient humidity, thereby improving the accuracy of the wind resistance rising threshold and ensuring that the defrost unit can be defrosted in time. For example, when the ambient humidity is relatively high, the edge computing module can set the wind resistance rising threshold to a relatively small value, thereby ensuring that the defrost unit can be defrosted in time.

[0057] The inventors have found through experiments that, compared with the existing defrosting device based on a single parameter, the defrost control device provided by the present embodiment can reduce the overall energy consumption by 15%-25%, and local defrosting can avoid shutdown of the temperature control system where the heat exchange unit is located. The defrost control device provided by the present embodiment can make the indoor temperature fluctuate by ≤1°C during defrosting. It can be seen that the defrost control device provided by the present embodiment can reduce energy consumption, basically does not affect the working state of the temperature control system, and can also improve user experience.

[0058] Optionally, the control module is also used to control the temperature control system where the heat exchange unit is located to switch to a reverse cycle mode when the area of ​​the target defrost region is greater than or equal to a set area threshold.

[0059] Specifically, the set area threshold can be set according to actual conditions. For example, the set area threshold can be the total area of ​​the set surface. When the area of ​​the target defrost area is greater than or equal to the set area threshold, it means that the frost layer area on the surface of the heat exchange unit is relatively large, and only partial defrosting will reduce the defrosting efficiency. In order to ensure the defrosting efficiency when the area of ​​the target defrost area is greater than or equal to the set area threshold, the temperature control system where the heat exchange unit is located is set in this embodiment to switch to the reverse cycle mode for self-defrosting, thereby avoiding the temperature control system from being unable to work normally due to too thick frost layer.

[0060] When the temperature control system switches to the reverse cycle mode, the control module can also control all defrost units to defrost, thereby speeding up the defrost efficiency.

[0061] Optionally, the control module is also used to control the frost layer of the heat exchange subunit with the thickest frost layer to be the target defrost area when the heat exchange unit includes n heat exchange subunits, and control the temperature control system of the heat exchange subunit with the thickest frost layer to switch to the reverse cycle mode, while ensuring that the temperature control system of at least one heat exchange subunit operates normally.

[0062] Specifically, when the heat exchange unit includes n heat exchange sub-units, it indicates that the system where the heat exchange unit is located is a multi-split system, and the defrost control device provided in this embodiment can defrost the frost layer in the multi-split system. The control module first processes the temperature control system with the most severe frosting in the multi-split system, and at the same time ensures that at least one temperature control system maintains normal operation to avoid large fluctuations in indoor temperature.

[0063] Figure 2 is a front structural schematic diagram of a defrost control device provided in an embodiment of the present invention applied to a heat exchange unit, with reference to Figure 2 , a plurality of defrost units 141 in the defrost module are arranged in an array on the surface of the heat exchange unit 210; the defrost unit 141 includes an electric heating wire; and the area of ​​the defrost unit 141 is less than or equal to a set threshold.

[0064] Specifically, multiple defrost units 141 are arranged in an array, which can basically ensure that each area of ​​the heat exchange unit 210 is covered by the defrost unit 141, thereby ensuring the defrosting effect of the defrost module and avoiding the problem of untimely and inaccurate defrosting in frosted areas due to the lack of corresponding defrost units 141.

[0065] The defrost unit 141 includes a heating wire, which can not only ensure the defrosting effect of the defrost unit 141, but also reduce the cost of the defrost unit 141, thereby reducing the manufacturing cost of the defrost control device. Figure 2 The rectangular shape of the defrost unit 141 is only one of the shapes of the defrost unit 141, and is not a limitation on the shape of the defrost unit 141 provided in this embodiment. The shape of the defrost unit 141 provided in this embodiment can be a combination of at least one or more of square, rectangular, triangular, and circular.

[0066] The threshold value may be set according to actual needs. For example, the threshold value may be 50 mm×50 mm, indicating that 50 mm×50 mm is an independent control area.

[0067] Figure 3 is a schematic diagram of the side structure of a defrost control device provided by an embodiment of the present invention applied to a heat exchange unit, with reference to Figure 2 and Figure 3 The acquisition module includes a thermal imaging unit 111 and a pressure difference detection unit 112; the thermal imaging unit 111 is arranged on the windward side of the heat exchange unit 210, and the thermal imaging unit 111 is used to collect the temperature field distribution information of the set surface of the heat exchange unit 210; the pressure difference detection unit 112 is arranged between the air inlet of the heat exchange unit 210 and the air outlet of the heat exchange unit 210, and the pressure difference detection unit 112 is used to collect the wind pressure difference of the heat exchange unit 210.

[0068] Specifically, the windward side of the heat exchange unit 210 refers to the side of the heat exchange unit 210 that directly faces the airflow. In the heat exchange unit 210, the windward side refers to the side where the refrigerant directly contacts the air and exchanges heat during the evaporation process. The windward side of the heat exchange unit 210 is prone to frost, and the frost on the windward side of the heat exchange unit 210 has a relatively large impact on the working performance of the heat exchange unit 210. Therefore, in this embodiment, the thermal imaging unit 111 is set on the windward side to collect the temperature field distribution information of the heat exchange unit 210, so that the thickness of the frost layer of the heat exchange unit 210 can be obtained in time to ensure timely defrosting. The pressure difference detection unit 112 is set between the air inlet of the heat exchange unit 210 and the air outlet of the heat exchange unit 210, which can ensure the accuracy of the wind pressure difference collected by the pressure difference detection unit 112.

[0069] Optional, continue to refer to Figure 3 The collection module also includes a humidity detection unit 113; the humidity detection unit 113 includes a humidity sensor, and the humidity detection unit 113 is used to detect the humidity of the environment in which the heat exchange unit 210 is located.

[0070] Specifically, the humidity detection unit 113 may be disposed near the heat exchange unit 210 , thereby ensuring that the humidity detection unit 113 accurately detects the humidity of the environment in which the heat exchange unit 210 is located.

[0071] It should be noted that Figure 2 and Figure 3 The positional relationship of the edge computing module 120 relative to the heat exchange unit 210 is only one of the positional relationships in the embodiment of the present invention and is not a limitation of the present invention. In actual applications, the relative positional relationship between the edge computing module 120 and the heat exchange unit 210 can be set according to actual needs.

[0072] Optionally, the thermal imaging unit includes an infrared thermal imaging sensor, which is used to collect temperature field distribution information of a set surface of the heat exchange unit; the pressure difference detection unit includes a pressure difference sensor, which is used to collect the wind pressure difference of the heat exchange unit.

[0073] Specifically, the infrared thermal imaging sensor can generate a temperature distribution image by detecting the infrared radiation emitted by the frost layer, and use it to monitor the temperature distribution on the surface of the heat exchange unit, which can more accurately determine the frosting situation and improve the defrosting efficiency. In addition, the infrared thermal imaging sensor is not limited by light conditions and can be used in harsh environments such as darkness, smoke, and haze, thereby ensuring that the defrost control device provided in this embodiment can defrost normally in harsh environments such as darkness, smoke, and haze. In addition, the infrared thermal imaging sensor has high detection accuracy (accuracy can reach ±0.1°C), so it can accurately detect the temperature of the surface of the heat exchange unit, reduce unnecessary defrosting operations, and save energy. In addition, the infrared thermal imaging sensor supports large-area scanning, and can obtain the temperature of each area of ​​the set surface at the same time, avoiding the problem of untimely defrosting due to detecting the temperature of a single area.

[0074] The differential pressure sensor can detect tiny pressures, has a millisecond-level response speed, supports continuous monitoring, and is also resistant to vibration and corrosion. Setting the differential pressure detection unit as a differential pressure sensor can improve the collection accuracy of the defrost control device and extend its service life.

[0075] This embodiment also provides a defrost control method, which can be applied to the defrost control device provided in any embodiment of the present invention. Figure 4 is a flow chart of a defrosting control method provided according to an embodiment of the present invention, with reference to Figure 4 The defrosting control method provided in this embodiment includes the following steps:

[0076] S110, the collection module collects the wind pressure difference of the heat exchange unit and the temperature field distribution information of the set surface of the heat exchange unit.

[0077] S120. The edge computing module determines the critical defrost threshold and the frost thickness distribution information of the set surface according to the wind pressure difference and the temperature field distribution information.

[0078] Wherein, the critical defrost threshold includes a thickness threshold, and the thickness threshold is greater than 0;

[0079] S130, the control module determines the target defrost area according to the frost layer thickness distribution information and the critical defrost threshold, and controls the defrost unit corresponding to the target defrost area to defrost, wherein the frost layer thickness of the target defrost area is greater than or equal to the thickness threshold.

[0080] The defrost control method provided in this embodiment can reduce defrost energy consumption, ensure that the temperature control system where the heat exchange unit is located continues to work during defrosting, and extend the service life of the temperature control system and increase its application scenarios.

[0081] The defrost control method provided in this embodiment has corresponding beneficial effects with the defrost control device provided in any embodiment of the present invention. For technical details not elaborated in this embodiment, please refer to the defrost control device provided in any embodiment of the present invention.

[0082] This embodiment also provides a temperature control system, which includes the defrost control device provided by any embodiment of the present invention.

[0083] Specifically, the temperature control system provided in this embodiment may further include a heat exchange unit, which may include one evaporator or multiple evaporators. The temperature control system provided in this embodiment can reduce defrosting energy consumption, ensure that the temperature control system continues to work during defrosting, and can also extend the service life of the temperature control system and increase its application scenarios.

[0084] It should be noted that Figure 2 and Figure 3 The structure shown may be a front structural schematic diagram and a side structural schematic diagram of a temperature control system provided in this embodiment.

[0085] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0086] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A defrost control device, characterized in that: include: Acquisition module, edge computing module, defrosting module and control module; The defrost module includes a plurality of defrost units for being arranged on the heat exchange unit; The acquisition module is used to acquire the wind pressure difference of the heat exchange unit and the temperature field distribution information of the set surface of the heat exchange unit; The edge computing module is used to determine a critical defrost threshold and frost thickness distribution information of the set surface according to the wind pressure difference and the temperature field distribution information; wherein the critical defrost threshold includes a thickness threshold, and the thickness threshold is greater than 0; The control module is used to determine a target defrost area according to the frost layer thickness distribution information and the critical defrost threshold, and control the defrost unit corresponding to the target defrost area to defrost, wherein the frost layer thickness of the target defrost area is greater than or equal to the thickness threshold.

2. The defrost control device according to claim 1, characterized in that: The collection module is also used to collect the humidity of the environment where the heat exchange unit is located; The edge computing module is also used to determine the frost formation rate of the frost layer on the heat exchange unit according to the wind pressure difference, the temperature field distribution information and the ambient humidity; The control module is further configured to determine the operating power of the defrost unit corresponding to the target defrost area according to the frost formation rate of the frost layer.

3. The defrost control device according to claim 2, characterized in that: The edge computing module is specifically used to determine the critical defrost threshold, the actual wind resistance increase rate, and the frost thickness distribution information of the set surface according to the wind pressure difference, the temperature field distribution information, and the ambient humidity; wherein the critical defrost threshold also includes a wind resistance increase rate threshold; The control module is specifically used to determine the target defrost area according to the frost layer thickness distribution information and the thickness threshold, and control the defrost unit corresponding to the target defrost area to defrost when the actual wind resistance increase rate is greater than or equal to the wind resistance increase rate threshold.

4. The defrost control device according to claim 1, characterized in that: The control module is further configured to control the temperature control system where the heat exchange unit is located to switch to a reverse cycle mode when the area of ​​the target defrost region is greater than or equal to a set area threshold.

5. The defrost control device according to claim 1, characterized in that: The control module is also used to control the frost layer of the heat exchange subunit with the thickest frost layer to be the target defrost area when the heat exchange unit includes n heat exchange subunits, and control the temperature control system of the heat exchange subunit with the thickest frost layer to switch to the reverse cycle mode, while ensuring that the temperature control system of at least one of the heat exchange subunits operates normally.

6. The defrost control device according to claim 1, characterized in that: The plurality of defrost units in the defrost module are arranged in an array on the surface of the heat exchange unit; The defrosting unit includes an electric heating wire; The area of ​​the defrost unit is less than or equal to a set threshold.

7. The defrost control device according to any one of claims 1 to 6, characterized in that: The acquisition module includes a thermal imaging unit and a pressure difference detection unit; The thermal imaging unit is disposed on the windward side of the heat exchange unit, and is used to collect the temperature field distribution information of a set surface of the heat exchange unit; The pressure difference detection unit is disposed between the air inlet of the heat exchange unit and the air outlet of the heat exchange unit, and the pressure difference detection unit is used to collect the wind pressure difference of the heat exchange unit.

8. The defrost control device according to claim 7, characterized in that: The thermal imaging unit includes an infrared thermal imaging sensor, and the infrared thermal imaging sensor is used to collect the temperature field distribution information of the set surface of the heat exchange unit; The pressure difference detection unit includes a pressure difference sensor, and the pressure difference sensor is used to collect the wind pressure difference of the heat exchange unit.

9. A defrosting control method, characterized in that: The defrost control method is applied to the defrost control device according to any one of claims 1 to 8; The defrost control method comprises: The acquisition module acquires the wind pressure difference of the heat exchange unit and the temperature field distribution information of the set surface of the heat exchange unit; The edge computing module determines a critical defrost threshold and frost thickness distribution information of the set surface according to the wind pressure difference and the temperature field distribution information; wherein the critical defrost threshold includes a thickness threshold, and the thickness threshold is greater than 0; The control module determines a target defrost area according to the frost layer thickness distribution information and the critical defrost threshold, and controls the defrost unit corresponding to the target defrost area to defrost, wherein the frost layer thickness of the target defrost area is greater than or equal to the thickness threshold.

10. A temperature control system, characterized in that: The defrost control device comprises the defrost control device according to any one of claims 1 to 8.

Images