Defrosting control method, device and system, air conditioner and multi-stage refrigeration air conditioning system

Abstract

The present disclosure relates to a defrosting control method, device and system, an air conditioner and a multi-stage refrigeration air conditioning system. The defrosting control method comprises: obtaining the temperature and humidity of the inlet and outlet of an air conditioner heat exchanger, the air speed into and out of the heat exchanger, and the weight of condensate water; determining the frost amount on the heat exchanger according to the temperature and humidity of the inlet and outlet of the air conditioner heat exchanger, the air speed into and out of the heat exchanger, and the weight of condensate water; determining whether the frost amount on the heat exchanger is greater than or equal to a first defrosting threshold; and in the case that the frost amount on the heat exchanger is greater than or equal to the first defrosting threshold, controlling the air conditioner to stop and start defrosting. The present disclosure can directly and accurately calculate the frost amount on the surface of the heat exchanger to directly determine whether defrosting should be started, thereby more accurately determining whether to start the defrosting mode and avoiding false defrosting and incomplete defrosting.

Description

Technical Field

[0001] This disclosure relates to the field of air conditioning technology, and in particular to a defrosting control method, device and system, air conditioner and multi-stage refrigeration air conditioning system. Background Technology

[0002] As mining depth increases, mine heat hazards become increasingly prominent, seriously affecting the health of underground workers and the safe production of coal mines. When the temperature exceeds 26℃, mine air conditioning needs to be installed.

[0003] Mine air conditioning systems in tunneling faces often employ a four-stage cooling and dehumidification system. The evaporation temperature of the last two stages is often below 0°C, at which point the unit is prone to frost formation. However, determining when to defrost has become a research hotspot. Relevant technical methods for determining defrost include: timed defrosting, judging temperature by evaporation temperature, and judging by fan current. Summary of the Invention

[0004] The inventors discovered through research that the defrosting method of mine air conditioning in the tunnel face of related technologies is prone to misjudgment, leading to false defrosting.

[0005] In view of at least one of the above technical problems, this disclosure provides a defrosting control method, apparatus and system, air conditioner and multi-stage refrigeration air conditioning system, which can more accurately determine whether to activate the defrosting mode.

[0006] According to one aspect of this disclosure, a defrosting control method is provided, comprising:

[0007] Obtain the temperature and humidity at the inlet and outlet of the air conditioner heat exchanger, the air velocity at the inlet and outlet of the heat exchanger, and the weight of condensate.

[0008] The amount of frost on the heat exchanger is determined based on the temperature and humidity at the inlet and outlet of the air conditioner heat exchanger, the air velocity at the inlet and outlet of the heat exchanger, and the weight of the condensate.

[0009] Determine whether the amount of frost on the heat exchanger is greater than or equal to the first defrosting threshold;

[0010] If the amount of frost on the heat exchanger is greater than or equal to the first defrosting threshold, the air conditioner will be shut down to initiate defrosting.

[0011] In some embodiments of this disclosure, the defrosting control method further includes:

[0012] Obtain the evaporation temperature of the air conditioner;

[0013] Determine whether the air conditioner evaporation temperature is greater than or equal to the predetermined temperature threshold throughout a continuous predetermined time period;

[0014] If the air conditioner evaporation temperature cannot meet the requirement of being greater than or equal to the predetermined temperature threshold for a continuous predetermined period of time, then the steps of obtaining the temperature and humidity at the inlet and outlet of the air conditioner heat exchanger, the wind speed at the inlet and outlet of the heat exchanger, and the weight of the condensate will be executed.

[0015] In some embodiments of this disclosure, determining the amount of frost on the heat exchanger based on the temperature and humidity at the inlet and outlet of the air conditioning heat exchanger, the air velocity entering and exiting the heat exchanger, and the weight of condensate includes:

[0016] The total moisture content of the heat exchanger during the timing period is determined based on the temperature and humidity at the inlet and outlet of the heat exchanger and the air velocity entering and exiting the heat exchanger. The timing period is the time from the start of timing to the current time.

[0017] Obtain the change in the weight of condensate during the timing period;

[0018] The amount of frost on the heat exchanger is determined based on the change in the total moisture content of the heat exchanger and the change in the weight of the condensate during the timing period.

[0019] In some embodiments of this disclosure, determining the total moisture content of the heat exchanger during a time period based on the temperature and humidity at the inlet and outlet of the heat exchanger and the wind speed entering and exiting the heat exchanger includes:

[0020] The average temperature and humidity at the inlet and outlet of the heat exchanger, and the average wind speed entering and exiting the heat exchanger within each predetermined time interval of the time period, wherein the time period includes multiple predetermined time intervals;

[0021] The humidity content of the air before and after passing through the heat exchanger is determined based on the average temperature and humidity at the inlet and outlet of the heat exchanger.

[0022] The humidity content within each predetermined time interval is determined based on the air moisture content before and after passing through the heat exchanger, the cross-sectional area of ​​the indoor unit, the average density of the fresh air before and after passing through the heat exchanger, the predetermined time interval, and the average value of the air velocity entering and exiting the heat exchanger.

[0023] The total moisture content of the heat exchanger during the timing period is determined based on the moisture content within each predetermined time interval.

[0024] In some embodiments of this disclosure, determining the moisture content within each predetermined time interval based on the air moisture content before and after passing through the heat exchanger, the cross-sectional area of ​​the indoor unit, the average density of fresh air before and after passing through the heat exchanger, a predetermined time interval, and the average wind speed entering and exiting the heat exchanger includes:

[0025] The difference in air humidity is determined based on the air humidity before and after passing through the heat exchanger, wherein the difference in air humidity is the difference in air humidity before and after passing through the heat exchanger.

[0026] The humidity level within each predetermined time interval is determined by multiplying the difference in air humidity, the cross-sectional area of ​​the indoor unit, the average density of fresh air before and after passing through the heat exchanger, the predetermined time interval, and the average wind speed entering and exiting the heat exchanger.

[0027] In some embodiments of this disclosure, obtaining the change in the weight of condensate during the timing period includes:

[0028] Obtain the weight of the condensate at the start of the timing;

[0029] Get the weight of condensate at the current moment;

[0030] The change in condensate weight during the timing period is determined by the difference between the current condensate weight and the condensate weight at the start of timing.

[0031] In some embodiments of this disclosure, determining the amount of frost on the heat exchanger based on the change in the total moisture content and the weight of condensate during the timing period includes:

[0032] The amount of frost on the heat exchanger is determined by the difference between the total moisture content of the heat exchanger and the change in the weight of the condensate during the timing period.

[0033] In some embodiments of this disclosure, the defrosting control method further includes:

[0034] Get the weight of the condensate at the moment defrosting is started and the weight of the condensate at the current moment;

[0035] Based on the weight of condensate at the moment defrosting begins and the weight of condensate at the current moment, determine the change in the weight of condensate during the defrosting period.

[0036] Determine whether the change in the weight of condensate during the defrosting period is greater than or equal to the second defrosting threshold.

[0037] If the change in the weight of condensate during the defrosting period is greater than or equal to the second defrosting threshold, the defrosting mode will be exited.

[0038] In some embodiments of this disclosure, the defrosting control method is used in a single-stage air conditioner or a multi-stage refrigeration air conditioner system, wherein the multi-stage refrigeration air conditioner system is composed of multi-stage refrigeration air conditioners;

[0039] In some embodiments of this disclosure, the defrosting control method further includes: when the defrosting control method is used in a multi-stage refrigeration air conditioning system, performing the defrosting control method as described in any of the above embodiments for each refrigeration air conditioner.

[0040] In some embodiments of this disclosure, when the defrosting control method is used in a multi-stage refrigeration air conditioning system, determining the amount of frost on the heat exchanger based on the temperature and humidity at the inlet and outlet of the air conditioning heat exchanger, the air velocity entering and exiting the heat exchanger, and the weight of condensate includes:

[0041] For each level of air conditioning, the amount of frost on the heat exchanger is determined based on the temperature and humidity at the inlet and outlet of the heat exchanger, the air velocity at the inlet and outlet of the heat exchanger, and the weight of the condensate.

[0042] In some embodiments of this disclosure, when the defrosting control method is used in a multi-stage refrigeration air conditioning system, the step of controlling the air conditioner to stop and initiate defrosting when the amount of frost accumulation on the heat exchanger is greater than a first defrosting threshold includes:

[0043] If the amount of frost on the heat exchanger of at least one stage of refrigeration is greater than or equal to the first defrosting threshold, the at least one stage of refrigeration air conditioner with the amount of frost greater than or equal to the first defrosting threshold shall be shut down and defrosting mode shall be activated.

[0044] Air conditioners that control the amount of frost accumulation to be less than the first defrosting threshold will operate at increased frequency.

[0045] In some embodiments of this disclosure, when the defrosting control method is used in a multi-stage refrigeration air conditioning system, the step of controlling the air conditioner to stop and initiate defrosting when the amount of frost accumulation on the heat exchanger is greater than a first defrosting threshold further includes:

[0046] If the amount of frost on the heat exchanger of at least two-stage refrigeration air conditioners is greater than or equal to the first defrost threshold, compare the amount of frost on at least two-stage refrigeration air conditioners that is greater than the first defrost threshold.

[0047] Defrosting is performed on the at least two-stage refrigeration air conditioners according to the order of the amount of frost accumulation, with priority given to defrosting the air conditioners with larger amounts of frost accumulation.

[0048] When the amount of frost accumulation in at least two stages of air conditioning is equal, the subsequent stage air conditioning should be defrosted first. In a multi-stage air conditioning system, the multi-stage air conditioning units are connected in series from the local ventilation fan through the air duct. The air conditioning unit that is far away from the local ventilation fan is the subsequent stage air conditioning unit.

[0049] According to another aspect of this disclosure, a defrosting control device is provided, comprising:

[0050] The parameter determination module is configured to acquire the temperature and humidity at the inlet and outlet of the air conditioning heat exchanger, the air velocity at the inlet and outlet of the heat exchanger, and the weight of condensate.

[0051] The frost accumulation determination module is configured to determine the amount of frost accumulation on the heat exchanger based on the temperature and humidity at the inlet and outlet of the air conditioner heat exchanger, the air velocity at the inlet and outlet of the heat exchanger, and the weight of the condensate.

[0052] The frost accumulation comparison module is configured to determine whether the amount of frost accumulation on the heat exchanger is greater than or equal to the first defrosting threshold.

[0053] The defrosting control module is configured to control the air conditioner to stop and start defrosting when the amount of frost on the heat exchanger is greater than or equal to the first defrosting threshold.

[0054] According to another aspect of this disclosure, a defrosting control device is provided, comprising:

[0055] Memory, used to store instructions;

[0056] A processor is configured to execute the instructions, causing the defrosting control device to perform operations implementing the defrosting control method as described in any of the above embodiments.

[0057] According to another aspect of this disclosure, a defrosting control system is provided, comprising:

[0058] Temperature and humidity sensors are configured to collect the temperature and humidity at the inlet and outlet of an air conditioning heat exchanger.

[0059] An anemometer is configured to collect the wind speed entering and exiting the air conditioning heat exchanger;

[0060] A condensate collector is configured to collect the weight of condensate from an air conditioning heat exchanger; and

[0061] Defrosting control device as described in any of the above embodiments.

[0062] According to another aspect of this disclosure, an air conditioner is provided, including a defrosting control system as described in any of the above embodiments.

[0063] According to another aspect of this disclosure, a multi-stage refrigeration air conditioning system is provided, including a multi-stage refrigeration air conditioning system and a defrosting control system as described in any of the above embodiments.

[0064] In some embodiments of this disclosure, the multi-stage refrigeration and air conditioning system further includes:

[0065] Local ventilation fans; and

[0066] The air duct is used in multi-stage air conditioning systems, where the air conditioners are connected in series from the local ventilation fans, and the air conditioners located away from the local ventilation fans are called downstream air conditioners.

[0067] In some embodiments of this disclosure, each stage of the refrigeration air conditioner is equipped with a temperature and humidity sensor, an anemometer, and a condensate collector.

[0068] In some embodiments of this disclosure, the multi-stage refrigeration and air conditioning system is a mine air conditioner for tunneling faces.

[0069] In some embodiments of this disclosure, the multi-stage refrigeration and air conditioning system is a multi-stage cooling and dehumidification system.

[0070] According to another aspect of this disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions that, when executed by a processor, implement the defrosting control method as described in any of the above embodiments.

[0071] This disclosure can directly and accurately calculate the amount of frost on the heat exchanger surface to determine whether defrosting should be started, thereby more accurately determining whether to start the defrosting mode, without causing false defrosting or incomplete defrosting. Attached Figure Description

[0072] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0073] Figure 1 This is a schematic diagram of some embodiments of the multi-stage refrigeration and air conditioning system disclosed herein.

[0074] Figure 2 This is a schematic diagram of some embodiments of the defrosting control method disclosed herein.

[0075] Figure 3 This is a schematic diagram of some other embodiments of the defrosting control method disclosed herein.

[0076] Figure 4 This is a schematic diagram of some embodiments of the defrosting control method disclosed herein.

[0077] Figure 5 This is a schematic diagram of some embodiments of the defrosting control method disclosed herein.

[0078] Figure 6 This is a schematic diagram of some embodiments of the defrosting control device disclosed herein.

[0079] Figure 7 This is a schematic diagram of the structure of some other embodiments of the defrosting control device disclosed herein.

[0080] Figure 8 This is a schematic diagram of some embodiments of the defrosting control system disclosed herein.

[0081] Figure 9 This is a schematic diagram of some embodiments of the air conditioner disclosed herein. Detailed Implementation

[0082] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0083] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure.

[0084] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0085] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0086] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0087] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0088] Figure 1 This is a schematic diagram of some embodiments of the multi-stage refrigeration and air conditioning system disclosed herein. For example... Figure 1 As shown, the multi-stage refrigeration and air conditioning system disclosed herein may include a multi-stage refrigeration and air conditioning unit, a defrosting control device, a local ventilation fan 1, and a duct 2, wherein:

[0089] Multi-stage air conditioning systems are connected in series from local ventilation fan 1 through air duct 2. The air conditioning system located away from the local ventilation fan is the subsequent stage air conditioning system.

[0090] In some embodiments of this disclosure, such as Figure 2 As shown, the multi-stage refrigeration air conditioning system disclosed herein may include a four-stage refrigeration air conditioning system.

[0091] In some embodiments of this disclosure, such as Figure 2 As shown, each stage of the air conditioning system includes outdoor units 7, 8, 9, and 10 and indoor units 3, 4, 5, and 6. Each stage of the air conditioning system is equipped with a temperature and humidity sensor 11, an anemometer 12, and a condensate collector 13.

[0092] Temperature and humidity sensor 11 is configured to collect the temperature and humidity at the inlet and outlet of the air conditioner heat exchanger.

[0093] Anemometer 12 is configured to collect the wind speed entering and exiting the air conditioning heat exchanger.

[0094] Condensate collector 13 is configured to collect the weight of condensate from the air conditioning heat exchanger.

[0095] In some embodiments of this disclosure, the indoor units 3, 4, 5, and 6 can specifically be direct expansion combination cabinets 3, 4, 5, and 6.

[0096] In some embodiments of this disclosure, outdoor units 7, 8, 9, and 10 can be refrigeration units 7, 8, 9, and 10.

[0097] The defrosting control device is configured to acquire the temperature and humidity at the inlet and outlet of the air conditioner heat exchanger, the air velocity entering and exiting the heat exchanger, and the weight of condensate; determine the amount of frost on the heat exchanger based on the temperature and humidity at the inlet and outlet of the air conditioner heat exchanger, the air velocity entering and exiting the heat exchanger, and the weight of condensate; determine whether the amount of frost on the heat exchanger is greater than or equal to a first defrosting threshold; and control the air conditioner to stop and start defrosting if the amount of frost on the heat exchanger is greater than or equal to the first defrosting threshold.

[0098] In some embodiments of this disclosure, the amount of frost accumulation is the amount of defrosting or the amount of frost layer.

[0099] The embodiments of this disclosure can accurately calculate the amount of frost on the heat exchanger based on the temperature and humidity, air volume, and condensate weight at the heat exchanger inlet and outlet. Therefore, the embodiments of this disclosure can directly and accurately calculate the amount of frost on the heat exchanger surface to directly determine whether defrosting should be initiated, thus more accurately determining whether to activate the defrosting mode and avoiding accidental defrosting or incomplete defrosting.

[0100] In some embodiments of this disclosure, such as Figure 2 As shown, indoor units 3, 4, 5, and 6 are respectively the first-level indoor unit 3, the second-level indoor unit 4, the third-level indoor unit 5, and the fourth-level indoor unit 6.

[0101] In some embodiments of this disclosure, such as Figure 2 As shown, the first-level indoor unit 3, the second-level indoor unit 4, the third-level indoor unit 5, and the fourth-level indoor unit 6 are respectively connected to the first-level outdoor unit 7, the first-level outdoor unit 8, the first-level outdoor unit 9, and the fourth-level outdoor unit 10.

[0102] In some embodiments of this disclosure, such as Figure 2 As shown, indoor units 3, 4, 5, and 6 all include evaporators 14, wherein the evaporator 14 is a heat exchanger.

[0103] In some embodiments of this disclosure, the multi-stage refrigeration and air conditioning system of this disclosure can be a mine air conditioner for tunneling faces.

[0104] In some embodiments of this disclosure, the multi-stage refrigeration and air conditioning system may be a multi-stage cooling and dehumidification system.

[0105] In some embodiments of this disclosure, the multi-stage refrigeration and air conditioning system of this disclosure can be a four-stage cooling and dehumidification system for the tunnel face.

[0106] The above-described embodiments of the mine air conditioning system used in the tunneling face are four-stage cooling systems with an outlet air temperature as low as 10°C. The unit supplies cold air to the tunneling head through the air duct to achieve a cooling effect.

[0107] The above embodiments of this disclosure are applicable to multi-stage cooling and dehumidification systems in mine tunneling faces. The above embodiments of this disclosure can solve the problems of accidental defrosting and incomplete defrosting that are common in related technologies. The above embodiments of this disclosure combine laboratory measurements of the specific critical value of the required amount of frost accumulation to determine the actual defrosting judgment point.

[0108] The embodiments disclosed above are applicable to multi-stage cooling and dehumidification systems in mines. The downstream evaporator is prone to frost formation, but conventional detection methods in related technologies are inaccurate in detecting the frost layer. The embodiments disclosed above can accurately calculate the weight of the frost layer without being affected by the weight of the condensate.

[0109] The defrosting control method, apparatus and system of this disclosure are described below through specific embodiments.

[0110] Figure 2 This is a schematic diagram of some embodiments of the defrosting control method disclosed herein. Figure 2 The embodiments may be based on the defrost control device or defrost control system of this disclosure, or air conditioner or multi-stage refrigeration air conditioning system of this disclosure (e.g., Figure 1 (Example: Multi-stage refrigeration and air conditioning system). For example... Figure 2 As shown, Figure 2 The method of the embodiment may include at least one of steps 100 to 400, wherein:

[0111] Step 100: Obtain the temperature and humidity at the inlet and outlet of the air conditioner heat exchanger, the wind speed v at the inlet and outlet of the heat exchanger, and the weight of condensate.

[0112] In some embodiments of this disclosure, the air conditioning heat exchanger may be an evaporator.

[0113] In some embodiments of this disclosure, the temperature and humidity at the inlet and outlet of the air conditioning heat exchanger may include the dry-bulb temperature T2 of the evaporator and the relative humidity h1 and h2 of the evaporator.

[0114] Step 200: Determine the amount of frost on the heat exchanger based on the temperature and humidity at the inlet and outlet of the air conditioner heat exchanger, the air velocity at the inlet and outlet of the heat exchanger, and the weight of the condensate.

[0115] In some embodiments of this disclosure, the amount of frost accumulation is the amount of defrosting or the amount of frost layer.

[0116] In some embodiments of this disclosure, step 200 may include at least one of steps 210 to 230, wherein:

[0117] Step 210: Determine the total moisture content D of the heat exchanger during the timing period based on the temperature and humidity (T1, T2, h1, h2) at the inlet and outlet of the heat exchanger and the wind speed v at the inlet and outlet of the heat exchanger. The timing period is the time from the start of timing to the current time.

[0118] In some embodiments of this disclosure, step 210 may include at least one of steps 211 to 214, wherein:

[0119] Step 211: The average values ​​of temperature and humidity (T1, T2, h1, h2) at the inlet and outlet of the heat exchanger and the average values ​​of wind speed v entering and leaving the heat exchanger within each predetermined time interval N2 of the timing period, wherein the timing period includes multiple predetermined time intervals N2.

[0120] In some embodiments of this disclosure, the predetermined time interval N2 ranges from 5 to 10 seconds.

[0121] Step 212: Determine the humidity d1 and d2 of the air before and after passing through the heat exchanger based on the average values ​​of temperature and humidity (T1, T2, h1, h2) at the inlet and outlet of the heat exchanger.

[0122] Step 213: Determine the moisture content within each predetermined time interval based on the air moisture content before and after passing through the heat exchanger, the cross-sectional area of ​​the indoor unit, the average density of fresh air before and after passing through the heat exchanger, the predetermined time interval N2, and the average value of the air velocity entering and exiting the heat exchanger.

[0123] In some embodiments of this disclosure, the indoor unit may be a direct expansion combination cabinet.

[0124] In some embodiments of this disclosure, step 213 may include: determining the air humidity difference d2-d1 based on the air humidity before and after passing through the heat exchanger, wherein the air humidity difference is the difference in air humidity before and after passing through the heat exchanger; determining the humidity within each predetermined time interval based on the product of the air humidity difference, the cross-sectional area of ​​the indoor unit, the average density of fresh air before and after passing through the heat exchanger, a predetermined time interval, and the average value of the wind speed entering and exiting the heat exchanger.

[0125] In some embodiments of this disclosure, step 213 may include: determining the moisture content within each predetermined time interval N2 according to formula (1).

[0126] D0=v*N2*60*S*ρ*(d2-d1) / 1000 (1)

[0127] In formula (1), S is the cross-sectional area of ​​the indoor unit, ρ is the average density of fresh air before and after passing through the evaporator, and d1 and d2 are the total moisture content within the predetermined time interval N2.

[0128] Step 214: Determine the total moisture content of the heat exchanger during the timing period based on the moisture content within each predetermined time interval.

[0129] In some embodiments of this disclosure, step 214 may include: determining the total moisture content of the heat exchanger during the timing period according to formula (2).

[0130] D = D0 + D1 + D2 + D3 + ... + D n (2)

[0131] In formula (2), the timing period includes n+1 predetermined time intervals, where n is a natural number greater than 0. For the moisture content D1, D2, D3, ..., D... of the first to nth predetermined time intervals... n All can be determined according to formula (1).

[0132] In some embodiments of this disclosure, the shorter the predetermined time interval N2, the smaller the error, similar to calculus in calculating the total moisture content.

[0133] The embodiments of this disclosure calculate the moisture content at multiple predetermined time intervals within a timing period, and then sum them up. These embodiments employ a calculus-like approach to calculate the total moisture content, thus improving the accuracy of moisture content calculation.

[0134] Step 220: Obtain the change in the weight of condensate (W2-W1) during the timing period.

[0135] In some embodiments of this disclosure, step 220 may include at least one of steps 221 to 223, wherein:

[0136] Step 221: Obtain the weight W1 of the condensate at the start of timing.

[0137] Step 222: Obtain the current weight of condensate W2.

[0138] Step 223: Based on the difference between the current condensate weight W2 and the condensate weight W1 at the start of the timing, determine the change in condensate weight (W2-W1) during the timing period.

[0139] Therefore, the above embodiments of this disclosure can accurately calculate the change in the weight of condensate during a timing period.

[0140] Step 230: Determine the amount of frost on the heat exchanger based on the total moisture content D of the heat exchanger during the timing period and the change in the weight of the condensate (W2-W1).

[0141] In some embodiments of this disclosure, step 230 may include: determining the amount of frost on the heat exchanger based on the difference between the total moisture content of the heat exchanger and the change in the weight of the condensate during the timing period.

[0142] In some embodiments of this disclosure, step 230 may include: determining the amount of frost on the heat exchanger according to formula (3).

[0143] Amount of frost accumulation = D - (W2 - W1) (3)

[0144] In some embodiments of this disclosure, step 230 may include: calculating the total humidity in the air and subtracting the condensate in the drip tray to obtain the amount of frost on the evaporator.

[0145] The embodiments of this disclosure can directly determine the amount of frost on the heat exchanger by the difference between the change in the total moisture content of the heat exchanger and the change in the weight of the condensate. Therefore, the embodiments of this disclosure are the first to consider the weight of the condensate in determining the amount of frost, thus allowing for a more accurate determination of the amount of frost. The embodiments of this disclosure can also more accurately determine whether to activate the defrosting mode, avoiding accidental defrosting or incomplete defrosting.

[0146] Step 300: Determine whether the amount of frost on the heat exchanger is greater than or equal to the first defrosting threshold P1.

[0147] Step 400: If the amount of frost on the heat exchanger is greater than or equal to the first defrosting threshold P1, control the air conditioner to stop and start defrosting.

[0148] In some embodiments of this disclosure, the first defrosting threshold P1 is a defrosting critical point, and the first defrosting threshold P1 can be determined based on laboratory tests.

[0149] In some embodiments of this disclosure, the value of the first defrosting threshold P1 varies depending on the size of the evaporator, and is generally between 300 and 500g.

[0150] Conventional defrosting methods in related technologies are all indirect defrosting and cannot directly and accurately determine defrosting. The above-described embodiments of this disclosure can directly and accurately calculate the amount of frost on the heat exchanger surface to directly determine whether defrosting should be started, and determine whether defrosting is complete based on the weight of the frost.

[0151] Figure 3 This is a schematic diagram of some other embodiments of the defrosting control method disclosed herein. Figure 3 The embodiments may be based on the defrost control device or defrost control system of this disclosure, or air conditioner or multi-stage refrigeration air conditioning system of this disclosure (e.g., Figure 1 (Example: Multi-stage refrigeration and air conditioning system). For example... Figure 3 As shown, the defrosting control method disclosed herein may include, in addition to, Figure 2 In addition to at least one of steps 100 to 400 in the embodiments, the defrosting control method of this disclosure may further include at least one of steps 70 to 90, wherein:

[0152] Step 70: Obtain the air conditioner evaporation temperature T3.

[0153] Step 80: Determine whether the air conditioner evaporation temperature T3 is greater than or equal to the predetermined temperature threshold Ta within a continuous predetermined time period.

[0154] Step 90: If the air conditioner evaporator temperature is greater than or equal to the predetermined temperature threshold Ta for a continuous predetermined time period, then execute... Figure 2 At least one of steps 100 to 400 in the embodiment. If the air conditioner evaporation temperature cannot be greater than or equal to a predetermined temperature threshold for a continuous predetermined time period, the air conditioner operates normally without defrosting.

[0155] The embodiments of this disclosure first determine whether to initiate defrost detection and frost accumulation calculation and judgment logic by judging the air conditioner evaporation temperature. Defrost detection and frost accumulation calculation and judgment logic is only initiated if the evaporation temperature does not consistently exceed a predetermined temperature threshold within a predetermined time period. Therefore, the embodiments of this disclosure can reduce the computational burden of real-time defrost detection and frost accumulation calculation and judgment.

[0156] The embodiments of this disclosure first determine whether defrosting is needed based on the evaporation temperature. If the defrosting conditions are met, the evaporator begins to frost over, and some condensate will also drip down. The moisture content of the air is calculated using a formula, and some of it condenses on the evaporator while some melts in the water storage tank. The embodiments of this disclosure can accurately calculate the amount of frost on the heat exchanger based on the temperature and humidity at the inlet and outlet of the heat exchanger, the air volume, and the weight of the condensate.

[0157] Figure 4 This is a schematic diagram of some embodiments of the defrosting control method disclosed herein. Figure 4 The embodiments may be based on the defrost control device or defrost control system of this disclosure, or air conditioner or multi-stage refrigeration air conditioning system of this disclosure (e.g., Figure 1 (Example: Multi-stage refrigeration and air conditioning system). For example... Figure 4 As shown, the defrosting control method disclosed herein may include, in addition to, Figure 2 Steps 100 to 400 of the embodiment and Figure 3 In addition to at least one of steps 70 to 90 in the embodiments, the defrosting control method of this disclosure may further include at least one of steps 500 to 800, wherein:

[0158] Step 500: Obtain the weight of the condensate W2 at the moment defrosting is started and the weight of the condensate W3 at the current moment.

[0159] Step 600: Determine the change in the weight of condensate during the defrosting period based on the weight of condensate W2 at the moment defrosting is initiated and the weight of condensate W3 at the current moment.

[0160] In some embodiments of this disclosure, step 513 may include: determining the change in the weight of condensate during the defrosting period based on the difference W3-W2 between the weight of condensate at the moment defrosting is initiated and the weight of condensate at the current moment.

[0161] Step 700: Determine whether the change in the weight of condensate during the defrosting period is greater than or equal to the second defrosting threshold P2.

[0162] In some embodiments of this disclosure, the second defrosting threshold P2 is an empirical value.

[0163] In some embodiments of this disclosure, considering the possibility of calculation errors and the presence of frost on the evaporator surface when the unit is turned off, as well as the slight reduction in air humidity, the second defrosting threshold P2 can be revised accordingly.

[0164] Step 800: If the change in the weight of condensate during the defrosting period is greater than or equal to the second defrosting threshold, exit the defrosting mode.

[0165] In the above embodiments of this disclosure, the defrosting process is determined based on the weight of the condensate during defrosting, thus preventing accidental defrosting.

[0166] In some embodiments of this disclosure, the defrosting control method (e.g.) Figures 2 to 4 The defrosting control method of any embodiment can be applied to single-stage or multi-stage air conditioning systems (e.g., Figure 1 The embodiment of the multi-stage refrigeration air conditioning system is provided, wherein the multi-stage refrigeration air conditioning system is composed of multi-stage refrigeration air conditioners.

[0167] The embodiments disclosed above have a wide range of applications and can be applied to single-stage or multi-stage air conditioning systems.

[0168] In some embodiments of this disclosure, the defrosting control method further includes: when the defrosting control method is used in a multi-stage refrigeration air conditioning system, performing any of the above embodiments (e.g., ...) for each refrigeration air conditioner. Figures 2 to 4 The defrosting control method described in any embodiment) is a defrosting control method.

[0169] In some embodiments of this disclosure, when the defrosting control method is used in a multi-stage refrigeration air conditioning system, Figure 2Step 200 of the embodiment may include: for each stage of refrigeration air conditioning, determining the amount of frost on the heat exchanger of that stage of refrigeration air conditioning based on the temperature and humidity at the inlet and outlet of the air conditioning heat exchanger, the wind speed entering and exiting the heat exchanger, and the weight of condensate.

[0170] The embodiments of this disclosure directly determine the amount of frost accumulation on the heat exchanger of each stage of a multi-stage air conditioning system. Therefore, the embodiments of this disclosure can more accurately determine the amount of frost accumulation for each stage of the air conditioning system. For each stage of the air conditioning system, the embodiments of this disclosure can more accurately determine whether to activate the defrost mode, without causing false defrosting or incomplete defrosting.

[0171] In some embodiments of this disclosure, when the defrosting control method is used in a multi-stage refrigeration air conditioning system, Figure 2 Step 400 of the embodiment may include: when the amount of frost on the heat exchanger of at least one stage of refrigeration air conditioner is greater than or equal to the first defrost threshold P1, controlling the at least one stage of refrigeration air conditioner with the amount of frost greater than or equal to the first defrost threshold P1 to stop and start the defrost mode; controlling the refrigeration air conditioner with the amount of frost less than the first defrost threshold P1 to operate at increased frequency.

[0172] In the above embodiments of the present disclosure, for multi-stage refrigeration air conditioning systems, air conditioners that meet the defrosting conditions activate the defrosting mode; while air conditioners that do not meet the defrosting conditions operate at increased frequency to ensure that the outlet air temperature meets the requirements.

[0173] In some embodiments of this disclosure, when the defrosting control method is used in a multi-stage refrigeration air conditioning system, Figure 2 Step 400 of the embodiment may further include: if the amount of frost on the heat exchangers of at least two stages of refrigeration air conditioners is greater than or equal to a first defrosting threshold P1, comparing the amount of frost on the at least two stages of refrigeration air conditioners that is greater than the first defrosting threshold P1; defrosting the at least two stages of refrigeration air conditioners according to the order of the amount of frost, prioritizing defrosting the refrigeration air conditioners with larger amounts of frost; if the amount of frost on the at least two stages of refrigeration air conditioners is equal, prioritizing defrosting the subsequent stage refrigeration air conditioner, wherein, in a multi-stage refrigeration air conditioner system, the multi-stage refrigeration air conditioners are connected in series through a duct starting from the local ventilation fan, and the refrigeration air conditioner farther away from the local ventilation fan is the subsequent stage refrigeration air conditioner.

[0174] In some embodiments of this disclosure, when the amount of frost on the heat exchangers of at least two-stage refrigeration air conditioners is greater than or equal to the first defrosting threshold P1, the refrigeration air conditioner with a large amount of frost will defrost first, while the refrigeration air conditioner with a small amount of frost will operate normally; then, the refrigeration air conditioner with a small amount of frost will defrost later, while the refrigeration air conditioner with a large amount of frost will operate normally.

[0175] In the above embodiments of this disclosure, when multiple air conditioners require defrosting, defrosting is prioritized for the air conditioners with the largest amount of frost accumulation; when the frost accumulation is equal, defrosting is prioritized for the air conditioners below that level. Therefore, the above embodiments of this disclosure can achieve priority defrosting for air conditioners with large amounts of frost accumulation and for the air conditioners below that level.

[0176] The embodiments of this disclosure involve laboratory testing and analysis of the heat exchanger of the air conditioning unit. Temperature and humidity sensors before and after the heat exchanger, along with fan airflow, are used to calculate the frost layer on the heat exchanger surface. These embodiments determine when defrosting is needed through actual observation, recording a preset defrosting threshold P1. When the threshold is reached during actual unit operation, the defrosting mode is activated. Furthermore, these embodiments determine whether defrosting is complete based on the weight of the condensate during defrosting, preventing accidental defrosting.

[0177] The embodiments of this disclosure can accurately calculate the amount of frost on the heat exchanger based on the temperature and humidity, air volume, and condensate weight at the heat exchanger inlet and outlet. The embodiments of this disclosure can also determine whether defrosting has begun or is complete by comparing measured values ​​with defrosting threshold values.

[0178] The embodiments described above can determine whether defrosting has started or completed by comparing the measured value with the defrosting threshold value.

[0179] The embodiments disclosed above can directly and accurately calculate the amount of frost on the heat exchanger surface to directly determine whether defrosting should be started, and determine whether defrosting is complete based on the weight of the frost.

[0180] Figure 5 This is a schematic diagram of some embodiments of the defrosting control method disclosed herein. Figure 5 The embodiments may be based on the defrost control device or defrost control system of this disclosure, or air conditioner or multi-stage refrigeration air conditioning system of this disclosure (e.g., Figure 1 (Example: Multi-stage refrigeration and air conditioning system). For example... Figure 5 As shown, the defrosting control method of this disclosure may further include at least one of steps 501 to 514, wherein:

[0181] Step 501: Real-time monitoring of T1, T2, T3, h1, h2, and v, where T1 is the dry-bulb temperature entering the evaporator, T2 is the dry-bulb temperature exiting the evaporator, T3 is the evaporation temperature of the air conditioner, h1 and h2 are the relative humidity entering and exiting the evaporator, and v is the wind speed entering and exiting the evaporator.

[0182] Step 502: Determine whether the air conditioner evaporation temperature T3 is greater than or equal to the predetermined temperature threshold Ta within a continuous predetermined time period N1. If the air conditioner evaporation temperature T3 is greater than or equal to the predetermined temperature threshold Ta within a continuous predetermined time period N1, proceed to step 503; otherwise, if the air conditioner evaporation temperature T3 is not greater than or equal to the predetermined temperature threshold within a continuous predetermined time period, proceed to step 504.

[0183] In some embodiments of this disclosure, the predetermined temperature threshold Ta ranges from -5 to -3°C.

[0184] In some embodiments of this disclosure, the predetermined time period N1 ranges from 2 to 4 minutes.

[0185] Step 503: The air conditioner is operating normally and does not require defrosting.

[0186] Step 504: The controller (defrosting control device of this disclosure) starts timing and records T1, T2, h1, h2, and v within a predetermined time interval N2.

[0187] In some embodiments of this disclosure, the predetermined time interval N2 ranges from 5 to 10 seconds.

[0188] Step 505: The defrosting control device determines the air humidity before and after passing through the heat exchanger based on the average temperature and humidity at the inlet and outlet of the heat exchanger.

[0189] In some embodiments of this disclosure, step 505 may include: reading the temperature and humidity of the inlet and outlet air passing through the evaporator, and calculating the humidity d1 and d2 of the air before and after passing through the system.

[0190] In some embodiments of this disclosure, step 505 may include: calculating the air humidity at a certain point in time based on the average temperature and humidity before and after entering and exiting the evaporator using a predetermined program or a predetermined formula.

[0191] Step 506: The defrosting control device calculates the average values ​​of T1, T2, h1, h2, and v within a predetermined time interval N2.

[0192] Step 507: From the start of timing, the defrost control device reads the initial condensate weight W1 at the start of timing and reads the current condensate weight W2.

[0193] In some embodiments of this disclosure, the weight of the condensate is directly weighed using the condensate collection tray of the condensate collector.

[0194] In some embodiments of this disclosure, step 507 may include: obtaining the weight of condensate at the start of timing; obtaining the weight of condensate at the current time; and determining the change in the weight of condensate during the timing period based on the difference between the weight of condensate at the current time and the weight of condensate at the start of timing.

[0195] Step 508: Calculate the cumulative moisture content (i.e., the total moisture content).

[0196] In some embodiments of this disclosure, step 508 may include at least one of steps 5081 and 5082, wherein

[0197] Step 5081: Determine the moisture content within each predetermined time interval N2 based on the air moisture content before and after passing through the heat exchanger, the cross-sectional area of ​​the indoor unit, the average density of fresh air before and after passing through the heat exchanger, the predetermined time interval, and the average value of the air velocity entering and exiting the heat exchanger.

[0198] In some embodiments of this disclosure, step 5081 may include: determining the difference in air humidity based on the air humidity before and after passing through the heat exchanger, wherein the difference in air humidity is the difference in air humidity before and after passing through the heat exchanger; determining the humidity within each predetermined time interval based on the product of the difference in air humidity, the cross-sectional area of ​​the indoor unit, the average density of fresh air before and after passing through the heat exchanger, a predetermined time interval, and the average value of the wind speed entering and exiting the heat exchanger.

[0199] In some embodiments of this disclosure, step 5081 may include: determining the moisture content within each predetermined time interval N2 according to formula (1).

[0200] Step 5082: Determine the total moisture content of the heat exchanger during the timing period based on the moisture content within each predetermined time interval N2.

[0201] In some embodiments of this disclosure, step 5081 may include: determining the total moisture content of the heat exchanger during the timing period according to formula (2).

[0202] In some embodiments of this disclosure, the shorter the predetermined time interval N2, the smaller the error, similar to calculus in calculating the total moisture content.

[0203] Step 509: Determine the amount of frost on the heat exchanger based on the change in total moisture content and condensate weight during the timing period; determine whether the amount of frost on the heat exchanger is greater than or equal to the first defrosting threshold P1. If the amount of frost on the heat exchanger is greater than or equal to the first defrosting threshold P1, proceed to step 510; otherwise, if the amount of frost on the heat exchanger is less than the first defrosting threshold P1, proceed to step 505, i.e., return to step 505 and continue monitoring.

[0204] In some embodiments of this disclosure, step 509 may include at least one of steps 5091 and 5092, wherein:

[0205] Step 5091: Determine the amount of frost on the heat exchanger according to formula (3).

[0206] In some embodiments of this disclosure, step 5091 may include: calculating the total humidity in the air and subtracting the condensate in the drip tray to obtain the amount of frost on the evaporator.

[0207] Step 5092: Determine whether the amount of frost on the heat exchanger, D-(W2-W1), is greater than or equal to the first defrosting threshold P1.

[0208] In some embodiments of this disclosure, the first defrosting threshold P1 is a defrosting critical point, and the first defrosting threshold P1 can be determined based on laboratory tests.

[0209] In some embodiments of this disclosure, the value of the first defrosting threshold P1 varies depending on the size of the evaporator, and is generally between 300 and 500g.

[0210] In some embodiments of this disclosure, the defrosting control method (e.g.) Figures 2 to 5 The defrosting control method of any embodiment can be applied to single-stage or multi-stage air conditioning systems (e.g., Figure 1 The embodiment of the multi-stage refrigeration air conditioning system is provided, wherein the multi-stage refrigeration air conditioning system is composed of multi-stage refrigeration air conditioners.

[0211] In some embodiments of this disclosure, the first defrost threshold P1 of each stage of the multi-stage refrigeration air conditioning system is the same.

[0212] In some embodiments of this disclosure, the defrosting control method further includes: when the defrosting control method is used in a multi-stage refrigeration air conditioning system, performing any of the above embodiments (e.g., ...) for each refrigeration air conditioner. Figures 2 to 4 At least one embodiment of the defrosting control method or Figure 5 The defrosting control method described in at least one of steps 501 to 509 of the embodiment.

[0213] Step 510: If the amount of frost on the heat exchanger is greater than or equal to the first defrosting threshold, control the air conditioning unit (the system) to stop and start defrosting.

[0214] Step 511: During the defrosting process, in a multi-stage air conditioning system, the compressors of other air conditioners control their compressor frequencies based on the air outlet temperature of the last stage evaporator, and operate at increased frequencies.

[0215] In some embodiments of this disclosure, when the defrosting control method is used in a multi-stage refrigeration and air conditioning system, steps 510-511 may include: when the amount of frost on the heat exchanger of at least one stage of the refrigeration and air conditioning is greater than or equal to a first defrosting threshold P1, controlling at least one stage of the refrigeration and air conditioning with the amount of frost greater than or equal to the first defrosting threshold P1 to stop and start defrosting mode; and controlling refrigeration and air conditioning with the amount of frost less than the first defrosting threshold P1 to operate at increased frequency.

[0216] In some embodiments of this disclosure, when the defrosting control method is used in a multi-stage refrigeration air conditioning system, step 510 may further include: if the amount of frost on the heat exchangers of at least two stages of refrigeration air conditioning is greater than or equal to a first defrosting threshold P1, comparing the amount of frost on the at least two stages of refrigeration air conditioning that is greater than the first defrosting threshold P1; defrosting the at least two stages of refrigeration air conditioning in order of the amount of frost, prioritizing defrosting the refrigeration air conditioning with a larger amount of frost; if the amount of frost on the at least two stages of refrigeration air conditioning is equal, prioritizing defrosting the subsequent stage refrigeration air conditioning, wherein in the multi-stage refrigeration air conditioning system, the multi-stage refrigeration air conditioning is connected in series through a duct starting from the local ventilator, and the refrigeration air conditioning farthest from the local ventilator is the subsequent stage refrigeration air conditioning.

[0217] Step 512: The defrost control device reads the current weight of condensate water W3 of the air conditioner.

[0218] In some embodiments of this disclosure, step 512 may include: obtaining the weight of condensate W2 at the moment defrosting is initiated and the weight of condensate W3 at the current moment.

[0219] Step 513: Determine whether the change in the weight of condensate during the defrosting period is greater than or equal to the second defrosting threshold P2. If the change in the weight of condensate during the defrosting period is greater than or equal to the second defrosting threshold, proceed to step 514; otherwise, if the change in the weight of condensate during the defrosting period is greater than or equal to the second defrosting threshold, proceed to step 510, i.e., continue to maintain the defrosting mode.

[0220] In some embodiments of this disclosure, step 513 may include: determining the change in condensate weight during the defrosting period based on the difference between the condensate weight at the moment defrosting is initiated and the current condensate weight; and determining whether the change in condensate weight during the defrosting period is greater than or equal to a second defrosting threshold, i.e., determining whether W3-W2 is greater than or equal to the second defrosting threshold P2.

[0221] In some embodiments of this disclosure, the second defrosting threshold P2 is an empirical value.

[0222] In some embodiments of this disclosure, considering the possibility of calculation errors and the presence of frost on the evaporator surface when the unit is turned off, as well as the slight reduction in air humidity, the second defrosting threshold P2 can be revised accordingly.

[0223] Step 514: Defrosting mode ends, cooling operation begins.

[0224] The present disclosure provides a defrosting control method for a multi-stage cooling and dehumidification system for mine air conditioning.

[0225] The embodiments described above allow for laboratory testing and analysis of the heat exchanger of this unit. Temperature and humidity sensors before and after the heat exchanger, along with fan airflow, are used to calculate the frost layer on the heat exchanger surface. Actual observation is used to determine when defrosting is needed, and a preset defrosting threshold P1 is recorded. When the threshold is reached during actual unit operation, the defrosting mode is activated. Furthermore, the embodiments described above allow for simultaneous determination of defrosting completion based on the weight of the condensate, preventing accidental defrosting.

[0226] Figure 6 These are schematic diagrams of some embodiments of the defrosting control device disclosed herein. Figure 6 As shown, the defrosting control device of this disclosure may include a parameter determination module 61, an frost accumulation determination module 62, an frost accumulation comparison module 63, and a defrosting control module 64, wherein:

[0227] The parameter determination module 61 is configured to acquire the temperature and humidity at the inlet and outlet of the air conditioning heat exchanger, the wind speed at the inlet and outlet of the heat exchanger, and the weight of condensate.

[0228] The frost accumulation determination module 62 is configured to determine the amount of frost accumulation on the heat exchanger based on the temperature and humidity at the inlet and outlet of the air conditioning heat exchanger, the air velocity at the inlet and outlet of the heat exchanger, and the weight of the condensate.

[0229] In some embodiments of this disclosure, the frost accumulation determination module 62 can be configured to determine the total moisture content of the heat exchanger during a timing period based on the temperature and humidity at the inlet and outlet of the heat exchanger and the wind speed entering and exiting the heat exchanger, wherein the timing period is the period from the start of timing to the current time; obtain the change in the weight of condensate during the timing period; and determine the frost accumulation on the heat exchanger based on the total moisture content of the heat exchanger and the change in the weight of condensate during the timing period.

[0230] In some embodiments of this disclosure, the frost accumulation determination module 62 can be configured to, when determining the total moisture content of the heat exchanger within a time period based on the temperature and humidity at the inlet and outlet of the heat exchanger and the air velocity entering and exiting the heat exchanger, calculate the average temperature and humidity at the inlet and outlet of the heat exchanger and the average air velocity entering and exiting the heat exchanger within each predetermined time interval of the time period, wherein the time period includes multiple predetermined time intervals; determine the air moisture content before and after passing through the heat exchanger based on the average temperature and humidity at the inlet and outlet of the heat exchanger; determine the moisture content within each predetermined time interval based on the air moisture content before and after passing through the heat exchanger, the cross-sectional area of ​​the indoor unit, the average density of fresh air before and after passing through the heat exchanger, the predetermined time interval, and the average air velocity entering and exiting the heat exchanger; and determine the total moisture content of the heat exchanger within the time period based on the moisture content within each predetermined time interval.

[0231] In some embodiments of this disclosure, the frost accumulation determination module 62 can be configured to determine the air humidity difference based on the air humidity before and after passing through the heat exchanger, wherein the air humidity difference is the difference in air humidity before and after passing through the heat exchanger; and to determine the humidity within each predetermined time interval based on the product of the air humidity difference, the cross-sectional area of ​​the indoor unit, the average density of fresh air before and after passing through the heat exchanger, the predetermined time interval, and the average value of the wind speed entering and exiting the heat exchanger.

[0232] In some embodiments of this disclosure, the frost accumulation determination module 62 can be configured to, upon obtaining the change in condensate weight during the timing period, obtain the condensate weight at the start of the timing period; obtain the condensate weight at the current moment; and determine the change in condensate weight during the timing period based on the difference between the condensate weight at the current moment and the condensate weight at the start of the timing period.

[0233] In some embodiments of this disclosure, the frost accumulation determination module 62 may be configured to determine the frost accumulation on the heat exchanger based on the difference between the total moisture content of the heat exchanger and the change in the weight of condensate during the timing period, when the frost accumulation on the heat exchanger is determined based on the change in the total moisture content of the heat exchanger and the weight of condensate during the timing period.

[0234] The frost accumulation comparison module 63 is configured to determine whether the amount of frost accumulation on the heat exchanger is greater than or equal to the first defrosting threshold P1.

[0235] The defrosting control module 64 is configured to control the air conditioner to stop and start defrosting when the amount of frost on the heat exchanger is greater than or equal to the first defrosting threshold P1.

[0236] In some embodiments of this disclosure, the defrosting control device may also be configured to acquire the air conditioner evaporation temperature; determine whether the air conditioner evaporation temperature is greater than or equal to a predetermined temperature threshold within a continuous predetermined time period; if the air conditioner evaporation temperature cannot meet the requirement of being greater than or equal to the predetermined temperature threshold within a continuous predetermined time period, then the instruction parameter determination module 61, the frost amount determination module 62, the frost amount comparison module 63, and the defrosting control module 64 shall perform corresponding operations, for example: the instruction parameter determination module 61 shall acquire the temperature and humidity at the inlet and outlet of the air conditioner heat exchanger, the wind speed entering and exiting the heat exchanger, and the weight of condensate.

[0237] In some embodiments of this disclosure, the defrosting control device may also be configured to acquire the weight of condensate at the moment defrosting is initiated and the weight of condensate at the current moment; determine the change in the weight of condensate during the defrosting period based on the weight of condensate at the moment defrosting is initiated and the weight of condensate at the current moment; determine whether the change in the weight of condensate during the defrosting period is greater than or equal to a second defrosting threshold; and exit the defrosting mode if the change in the weight of condensate during the defrosting period is greater than or equal to the second defrosting threshold.

[0238] In some embodiments of this disclosure, the defrosting control device can be applied to a single-stage air conditioner or a multi-stage refrigeration air conditioner system, wherein the multi-stage refrigeration air conditioner system is composed of multi-stage refrigeration air conditioners;

[0239] In some embodiments of this disclosure, the defrosting control device of this disclosure can be configured to perform any of the above embodiments (e.g., when applied to a multi-stage refrigeration and air conditioning system) for each refrigeration and air conditioning unit. Figures 2 to 5 The defrosting control method described in any embodiment.

[0240] In some embodiments of this disclosure, the defrosting control device of this disclosure can be configured to, when applied to a multi-stage refrigeration and air conditioning system, determine the amount of frost on the heat exchanger of each stage of refrigeration and air conditioning based on the temperature and humidity at the inlet and outlet of the air conditioning heat exchanger, the wind speed entering and exiting the heat exchanger, and the weight of condensate.

[0241] In some embodiments of this disclosure, when the defrosting control device of this disclosure is applied to a multi-stage refrigeration and air conditioning system, the defrosting control module 64 can be configured to, when the amount of frost accumulation on the heat exchanger of at least one stage of the refrigeration and air conditioning system is greater than or equal to a first defrosting threshold, control the at least one stage of the refrigeration and air conditioning system with the amount of frost accumulation greater than or equal to the first defrosting threshold to shut down and start the defrosting mode; and control the refrigeration and air conditioning system with the amount of frost accumulation less than the first defrosting threshold to operate at increased frequency.

[0242] In some embodiments of this disclosure, when the defrosting control device of this disclosure is applied to a multi-stage refrigeration and air conditioning system, the defrosting control module 64 may also be configured to, when the amount of frost on the heat exchangers of at least two stages of refrigeration and air conditioning is greater than or equal to a first defrosting threshold, compare the amount of frost on at least two stages of refrigeration and air conditioning that is greater than the first defrosting threshold; defrost the at least two stages of refrigeration and air conditioning in order of the amount of frost, prioritizing defrosting the refrigeration and air conditioning with a larger amount of frost; when the amount of frost on at least two stages of refrigeration and air conditioning is equal, prioritize defrosting the subsequent stage of refrigeration and air conditioning, wherein, in the multi-stage refrigeration and air conditioning system, the multi-stage refrigeration and air conditioning are connected in series through a duct starting from the local ventilation fan, and the refrigeration and air conditioning farthest from the local ventilation fan is the subsequent stage of refrigeration and air conditioning.

[0243] In the embodiments described above, the defrosting detection logic is initiated by determining the evaporator temperature of the air conditioner over a period of time. When the defrosting detection logic conditions are met, the logic is activated. Temperature and humidity sensors identify the inlet and outlet temperatures and humidity of the evaporator, calculate the difference in humidity between the inlet and outlet air, and detect the weight of the condensate. By comparing these two weights, the critical value for the frost layer is determined. The embodiments also use the defrosting amount to determine whether defrosting has ended. This method in the embodiments of the present disclosure provides accurate defrosting time and avoids accidental defrosting or incomplete defrosting.

[0244] Figure 7 This is a schematic diagram of the structure of some other embodiments of the defrosting control device disclosed herein. For example... Figure 7 As shown, the defrosting control device of this disclosure includes a memory 71 and a processor 72.

[0245] Memory 71 is used to store instructions, and processor 72 is coupled to memory 71. Processor 72 is configured to execute instructions stored in memory to implement the above embodiments (e.g., Figures 2 to 5 The defrosting control method involved in any embodiment.

[0246] like Figure 7 As shown, the defrosting control device also includes a communication interface 73 for exchanging information with other devices. Additionally, the defrosting control device includes a bus 74, through which the processor 72, communication interface 73, and memory 71 communicate with each other.

[0247] The memory 71 may include high-speed RAM, and may also include non-volatile memory, such as at least one disk drive. The memory 71 may also be a memory array. The memory 71 may also be divided into blocks, and the blocks may be combined into virtual volumes according to certain rules.

[0248] Furthermore, processor 72 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present disclosure.

[0249] Figure 8 This is a schematic diagram of some embodiments of the defrosting control system of this disclosure. For example... Figure 8 As shown, the defrosting control system of this disclosure may include a temperature and humidity sensor 11, an anemometer 12, a condensate collector 13, and a defrosting control device 80, wherein:

[0250] Temperature and humidity sensor 11 is configured to collect the temperature and humidity at the inlet and outlet of the air conditioner heat exchanger.

[0251] Anemometer 12 is configured to collect the wind speed entering and exiting the air conditioning heat exchanger.

[0252] Condensate collector 13 is configured to collect the weight of condensate from the air conditioning heat exchanger.

[0253] Defrosting control device 80 is as described in any of the above embodiments (e.g.) Figure 6 or Figure 7 The defrosting control device described in the embodiment).

[0254] This defrosting control system can be applied to, for example... Figure 9 The single-stage air conditioner shown in the embodiment can also be applied to, for example... Figure 1 The multi-stage refrigeration and air conditioning system shown in the embodiment. For example, Figure 9 In the single-stage air conditioner shown in the embodiment, a temperature and humidity sensor 11, an anemometer 12, and a condensate collector 13 are installed in the single-stage air conditioner. For example... Figure 1 In the multi-stage refrigeration and air conditioning system shown in the embodiment, temperature and humidity sensor 11, an anemometer 12, and condensate collector 13 are all installed in each stage of the refrigeration and air conditioning system.

[0255] Figure 9 This is a schematic diagram of some embodiments of the air conditioner disclosed herein. The air conditioner disclosed herein may include any of the embodiments described above (e.g., Figure 8 The defrosting control system described in the example).

[0256] In some embodiments of this disclosure, such as Figure 9 As shown, the air conditioner can be as follows: Figure 1 The multi-stage refrigeration air conditioning system in this embodiment only includes a first-stage refrigeration air conditioning system, wherein the target temperature of the single-stage air conditioning is 10-20 degrees Celsius, and the evaporation temperature of the single-stage air conditioning is less than 0 degrees Celsius.

[0257] According to another aspect of this disclosure, such as Figure 1 As shown, a multi-stage refrigeration air conditioning system is provided, including a multi-stage refrigeration air conditioner and as described in any of the above embodiments (e.g., Figure 8 The defrosting control system described in the example).

[0258] In some embodiments of this disclosure, such as Figure 1 As shown, each stage of the refrigeration and air conditioning system is equipped with a temperature and humidity sensor, an anemometer, and a condensate collector.

[0259] In some embodiments of this disclosure, the multi-stage refrigeration and air conditioning system is a mine air conditioner for tunneling faces.

[0260] In some embodiments of this disclosure, the multi-stage refrigeration and air conditioning system is a multi-stage cooling and dehumidification system.

[0261] In the embodiments described above, the defrosting detection logic is initiated by determining the evaporator temperature of the air conditioner over a period of time. When the defrosting detection logic conditions are met, the logic is activated. Temperature and humidity sensors identify the inlet and outlet temperatures and humidity of the evaporator, calculate the difference in humidity between the inlet and outlet air, and detect the weight of the condensate. By comparing these two weights, the critical value for the frost layer is determined. The embodiments also use the defrosting amount to determine whether defrosting has ended. This method in the embodiments of the present disclosure provides accurate defrosting time and avoids accidental defrosting or incomplete defrosting.

[0262] According to another aspect of this disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions that, when executed by a processor, implement any of the embodiments described above (e.g., Figures 2 to 5 The defrosting control method described in any embodiment.

[0263] The computer-readable storage medium disclosed herein can be implemented as a non-transitory computer-readable storage medium.

[0264] Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, apparatus, or computer program products. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0265] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0266] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1The function specified in one or more boxes.

[0267] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0268] The defrosting control device, parameter determination module, frost accumulation determination module, frost accumulation comparison module, and defrosting control module described above can be implemented as a general-purpose processor, programmable logic controller (PLC), digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof for performing the functions described herein.

[0269] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments of this disclosure can be implemented in hardware. The hardware can be implemented as a general-purpose processor, programmable logic controller, digital signal processor, application-specific integrated circuit, field-programmable gate array or other programmable logic device, discrete gate or transistor logic device, discrete hardware component or any suitable combination thereof for executing the methods of this disclosure.

[0270] This concludes the detailed description of the present disclosure. To avoid obscuring the concept of the disclosure, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solutions disclosed herein based on the above description.

[0271] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware, or by a program instructing the relevant hardware to implement them. The program can be stored in a non-transitory computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0272] The description in this disclosure is provided for illustrative and descriptive purposes only and is not intended to be exhaustive or to limit the disclosure to its forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of this disclosure and to enable those skilled in the art to understand this disclosure and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A defrosting control method, wherein, when the defrosting control method is applied to a multi-stage refrigeration air conditioning system, the defrosting control method is executed for each refrigeration air conditioner, the multi-stage refrigeration air conditioning system comprising multiple refrigeration air conditioners, the defrosting control method comprising: Obtain the temperature and humidity at the inlet and outlet of the air conditioner heat exchanger, the air velocity at the inlet and outlet of the heat exchanger, and the weight of condensate. The amount of frost on the heat exchanger is determined based on the temperature and humidity at the inlet and outlet of the air conditioner heat exchanger, the air velocity entering and exiting the heat exchanger, and the weight of condensate. Specifically, when the defrosting control method is used in a multi-stage refrigeration air conditioning system, determining the amount of frost on the heat exchanger based on the temperature and humidity at the inlet and outlet of the air conditioner heat exchanger, the air velocity entering and exiting the heat exchanger, and the weight of condensate includes: for each stage of refrigeration air conditioning, determining the amount of frost on the heat exchanger of that stage of refrigeration air conditioning based on the temperature and humidity at the inlet and outlet of the air conditioner heat exchanger, the air velocity entering and exiting the heat exchanger, and the weight of condensate. Determine whether the amount of frost on the heat exchanger is greater than or equal to the first defrosting threshold; If the amount of frost on the heat exchanger is greater than or equal to the first defrosting threshold, control the air conditioner to stop and start defrosting. Wherein, when the defrosting control method is used in a multi-stage refrigeration air conditioning system, the step of controlling the air conditioner to stop and start defrosting when the amount of frost on the heat exchanger is greater than the first defrosting threshold includes: If the amount of frost on the heat exchanger of at least two-stage refrigeration air conditioners is greater than or equal to the first defrost threshold, compare the amount of frost on at least two-stage refrigeration air conditioners that is greater than the first defrost threshold. Defrosting is performed on the at least two-stage refrigeration air conditioners according to the order of the amount of frost accumulation, with priority given to defrosting the air conditioners with larger amounts of frost accumulation. When the amount of frost accumulation in at least two stages of air conditioning is equal, the subsequent stage air conditioning should be defrosted first. In a multi-stage air conditioning system, the multi-stage air conditioning units are connected in series from the local ventilation fan through the air duct. The air conditioning unit that is far away from the local ventilation fan is the subsequent stage air conditioning unit.

2. The defrosting control method according to claim 1 further includes: Obtain the evaporation temperature of the air conditioner; Determine whether the air conditioner evaporation temperature is greater than or equal to the predetermined temperature threshold throughout a continuous predetermined time period; If the air conditioner evaporation temperature cannot meet the requirement of being greater than or equal to the predetermined temperature threshold for a continuous predetermined period of time, then the steps of obtaining the temperature and humidity at the inlet and outlet of the air conditioner heat exchanger, the wind speed at the inlet and outlet of the heat exchanger, and the weight of the condensate will be executed.

3. The defrosting control method according to claim 1 or 2, wherein, The determination of the amount of frost on the heat exchanger based on the temperature and humidity at the inlet and outlet of the air conditioner heat exchanger, the air velocity entering and exiting the heat exchanger, and the weight of the condensate includes: The total moisture content of the heat exchanger during the timing period is determined based on the temperature and humidity at the inlet and outlet of the heat exchanger and the air velocity entering and exiting the heat exchanger. The timing period is the time from the start of timing to the current time. Obtain the change in the weight of condensate during the timing period; The amount of frost on the heat exchanger is determined based on the change in the total moisture content of the heat exchanger and the change in the weight of the condensate during the timing period.

4. The defrosting control method according to claim 1 or 2, wherein, The determination of the total moisture content of the heat exchanger during the time period, based on the temperature and humidity at the inlet and outlet of the heat exchanger and the air velocity entering and exiting the heat exchanger, includes: The average temperature and humidity at the inlet and outlet of the heat exchanger, and the average wind speed entering and exiting the heat exchanger within each predetermined time interval of the time period, wherein the time period includes multiple predetermined time intervals; The humidity content of the air before and after passing through the heat exchanger is determined based on the average temperature and humidity at the inlet and outlet of the heat exchanger. The humidity content within each predetermined time interval is determined based on the air moisture content before and after passing through the heat exchanger, the cross-sectional area of ​​the indoor unit, the average density of the fresh air before and after passing through the heat exchanger, the predetermined time interval, and the average value of the air velocity entering and exiting the heat exchanger. The total moisture content of the heat exchanger during the timing period is determined based on the moisture content within each predetermined time interval.

5. The defrosting control method according to claim 4, wherein, The determination of the moisture content within each predetermined time interval based on the air moisture content before and after passing through the heat exchanger, the cross-sectional area of ​​the indoor unit, the average density of fresh air before and after passing through the heat exchanger, the predetermined time interval, and the average air velocity entering and exiting the heat exchanger includes: The difference in air humidity is determined based on the air humidity before and after passing through the heat exchanger, wherein the difference in air humidity is the difference in air humidity before and after passing through the heat exchanger. The humidity level within each predetermined time interval is determined by multiplying the difference in air humidity, the cross-sectional area of ​​the indoor unit, the average density of fresh air before and after passing through the heat exchanger, the predetermined time interval, and the average wind speed entering and exiting the heat exchanger.

6. The defrosting control method according to claim 3, wherein, The change in the weight of condensate during the timing period includes: Obtain the weight of the condensate at the start of the timing; Get the weight of condensate at the current moment; The change in condensate weight during the timing period is determined by the difference between the current condensate weight and the condensate weight at the start of timing.

7. The defrosting control method according to claim 3, wherein, The determination of the amount of frost on the heat exchanger based on the changes in the total moisture content and condensate weight of the heat exchanger during the timing period includes: The amount of frost on the heat exchanger is determined by the difference between the total moisture content of the heat exchanger and the change in the weight of the condensate during the timing period.

8. The defrosting control method according to claim 1 or 2, further comprising: Get the weight of the condensate at the moment defrosting is started and the weight of the condensate at the current moment; Based on the weight of condensate at the moment defrosting begins and the weight of condensate at the current moment, determine the change in the weight of condensate during the defrosting period. Determine whether the change in the weight of condensate during the defrosting period is greater than or equal to the second defrosting threshold. If the change in the weight of condensate during the defrosting period is greater than or equal to the second defrosting threshold, the defrosting mode will be exited.

9. The defrosting control method according to claim 1 or 2, wherein, When the defrosting control method is used in a multi-stage refrigeration air conditioning system, the step of controlling the air conditioner to stop and start defrosting when the amount of frost on the heat exchanger is greater than the first defrosting threshold further includes: If the amount of frost on the heat exchanger of at least one stage of refrigeration is greater than or equal to the first defrosting threshold, the at least one stage of refrigeration air conditioner with the amount of frost greater than or equal to the first defrosting threshold shall be shut down and defrosting mode shall be activated. Air conditioners that control the amount of frost accumulation to be less than the first defrosting threshold will operate at increased frequency.

10. A defrosting control device, comprising: The parameter determination module is configured to acquire the temperature and humidity at the inlet and outlet of the air conditioning heat exchanger, the air velocity at the inlet and outlet of the heat exchanger, and the weight of condensate. The frost accumulation determination module is configured to determine the amount of frost on the heat exchanger based on the temperature and humidity at the inlet and outlet of the air conditioning heat exchanger, the air velocity entering and exiting the heat exchanger, and the weight of condensate. When the defrosting control device is applied to a multi-stage refrigeration air conditioning system, the frost accumulation determination module is configured to determine the amount of frost on the heat exchanger of each stage of refrigeration air conditioning based on the temperature and humidity at the inlet and outlet of the air conditioning heat exchanger, the air velocity entering and exiting the heat exchanger, and the weight of condensate. The frost accumulation comparison module is configured to determine whether the amount of frost accumulation on the heat exchanger is greater than or equal to the first defrosting threshold. The defrosting control module is configured to control the air conditioner to stop and start defrosting when the amount of frost on the heat exchanger is greater than or equal to the first defrosting threshold. The defrosting control device is applied to a multi-stage refrigeration air conditioning system, which is composed of multi-stage refrigeration air conditioners. When the defrosting control device is applied to a multi-stage refrigeration and air conditioning system, the defrosting control module is configured to: when the amount of frost on the heat exchangers of at least two stages of refrigeration and air conditioning is greater than or equal to a first defrosting threshold, compare the amount of frost on the at least two stages of refrigeration and air conditioning that is greater than the first defrosting threshold; defrost the at least two stages of refrigeration and air conditioning in order of the amount of frost, prioritizing defrosting the refrigeration and air conditioning with a larger amount of frost; when the amount of frost on the at least two stages of refrigeration and air conditioning is equal, prioritize defrosting the subsequent stage of refrigeration and air conditioning, wherein in the multi-stage refrigeration and air conditioning system, the multi-stage refrigeration and air conditioning are connected in series through a duct starting from the local ventilation fan, and the refrigeration and air conditioning farthest from the local ventilation fan is the subsequent stage of refrigeration and air conditioning.

11. A defrosting control device, comprising: Memory, used to store instructions; A processor is configured to execute the instructions, causing the defrosting control device to perform operations implementing the defrosting control method as described in any one of claims 1-9.

12. A defrosting control system, comprising: Temperature and humidity sensors are configured to collect the temperature and humidity at the inlet and outlet of an air conditioning heat exchanger. An anemometer is configured to collect the wind speed entering and exiting the air conditioning heat exchanger; A condensate collector is configured to collect the weight of condensate from an air conditioning heat exchanger. and The defrosting control device as described in claim 10 or 11.

13. An air conditioner comprising the defrosting control system as described in claim 12.

14. A multi-stage refrigeration air conditioning system, comprising a multi-stage refrigeration air conditioner and a defrosting control system as described in claim 12.

15. The multi-stage refrigeration and air conditioning system according to claim 14, further comprising: Local ventilation fan; and The air duct is used in multi-stage air conditioning systems, where the air conditioners are connected in series from the local ventilation fans, and the air conditioners located away from the local ventilation fans are called downstream air conditioners.

16. The multi-stage refrigeration and air conditioning system according to claim 14 or 15, wherein, Temperature and humidity sensors, anemometers, and condensate collectors are installed in each stage of the refrigeration system.

17. The multi-stage refrigeration and air conditioning system according to claim 14 or 15, wherein: The multi-stage refrigeration and air conditioning system is a mine air conditioning system for tunneling faces; And / or, The multi-stage refrigeration and air conditioning system is a multi-stage cooling and dehumidification system.

18. A computer-readable storage medium, wherein, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the defrosting control method as described in any one of claims 1-9.

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