A defrosting method, heat exchanger structure and air conditioner

Abstract

The application provides a defrosting method, a heat exchanger structure and an air conditioner. The defrosting method comprises the following steps: detecting environmental parameters under the most common frosting weather in a region where a structure to be defrosted is located and system parameters under different starting load states, and taking the environmental parameters and the system parameters as preset load values; detecting environmental parameters and system parameters when the structure to be defrosted is currently running, and taking the environmental parameters and the system parameters as calculated load values; setting a judgment condition for the structure to be defrosted to enter a defrosting state, comparing the preset load values with the calculated load values, and adjusting the judgment condition according to a comparison result; and defrosting the structure to be defrosted according to the judgment condition. The defrosting method provided by the application solves the technical problem of long defrosting time of an outdoor heat exchanger.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to a defrosting method, heat exchanger structure and air conditioner. BACKGROUND

[0002] When the air conditioner is heating, the outdoor heat exchanger acts as an evaporator to absorb heat from the external environment. The surface temperature of the evaporator is relatively low, and frost is easily formed in the outdoor high-humidity low-temperature environment, which affects the heat exchange efficiency of the outdoor heat exchanger of the air conditioner, causes the heating performance of the air conditioner to decay, and when the frost is serious, it may also cause the system to stop.

[0003] However, the common defrosting method on the market generally opens the electronic expansion valve to make the outdoor condenser become an evaporator, and the high-temperature refrigerant flows through the outdoor heat exchanger to exchange heat with the frost layer to defrost. When the system is defrosting, the indoor becomes a condenser, so it cannot provide heat for the indoor, and the conventional defrosting period is generally about 10 minutes. The indoor heat exchange cannot be performed at the same time, and when the frost layer is too thin, the running time is too long, causing time waste.

[0004] Therefore, the prior art needs to be further developed. SUMMARY

[0005] The present application aims to overcome the above technical deficiencies, and provides a defrosting method, heat exchanger structure and air conditioner to solve the problem of long defrosting time of the outdoor heat exchanger in the related art.

[0006] To achieve the above technical purpose, the present application adopts the following technical scheme: a defrosting method is provided, comprising: detecting the environmental parameters in the most common frosting weather of the area where the structure to be defrosted is located, and the system parameters under different starting load conditions, as a preset load value; detecting the environmental parameters and system parameters of the structure to be defrosted when it is currently running, as a calculated load value; setting the judgment condition for the structure to be defrosted to enter the defrosting state, comparing the preset load value with the calculated load value, and adjusting the judgment condition according to the comparison result; and defrosting the structure to be defrosted according to the judgment condition.

[0007] Further, the environmental parameters include the temperature and humidity of the environment where the outdoor unit is located; the system parameters include the system low pressure of the structure to be defrosted, the defrosting temperature and the heat exchanger gas outlet temperature; wherein the defrosting temperature is the temperature of the refrigerant before entering the outdoor heat exchanger, and the heat exchanger gas outlet temperature is the temperature of the refrigerant flowing out of the outdoor heat exchanger.

[0008] Further, the judgment condition includes: the system parameters of the structure to be defrosted meet the preset relationship; and the duration of the system parameters of the structure to be defrosted meeting the preset relationship reaches the requirement.

[0009] Further, the determination condition comprises: heat exchanger gas outlet temperature - heat exchanger defrosting temperature > X℃, and the duration is Y.

[0010] Further, the method of adjusting the determination condition according to the comparison result comprises: when the calculated load value is equal to the preset load value, the determination condition is not adjusted; when the calculated load value is greater than the preset load value, the value of X is reduced; and when the calculated load value is less than the preset load value, the value of X is increased.

[0011] Further, the case that the calculated load value is equal to the preset load value comprises: the ambient temperature where the outdoor unit is located is equal to 0℃±A℃; the ambient humidity where the outdoor unit is located is equal to B%±C%; and the temperature value corresponding to the system low pressure of the defrosting structure is equal to D℃±E℃.

[0012] Further, the case that the calculated load value is greater than the preset load value comprises: the ambient temperature where the outdoor unit is located is less than 0℃; the ambient temperature where the outdoor unit is located is equal to 0℃±A℃, and the ambient humidity where the defrosting structure is located is greater than B%; the ambient temperature where the defrosting structure is located is equal to 0℃±A℃, the ambient humidity where the defrosting structure is located is equal to B%±C%, and the temperature value corresponding to the system low pressure of the defrosting structure is less than D℃.

[0013] Further, the case that the calculated load value is less than the preset load value comprises: the ambient temperature where the outdoor unit is located is greater than 0℃; the ambient temperature where the outdoor unit is located is equal to 0℃±A℃, and the ambient humidity where the defrosting structure is located is less than B%; the ambient temperature where the defrosting structure is located is equal to 0℃±A℃, the ambient humidity where the defrosting structure is located is equal to B%±C%, and the temperature value corresponding to the system low pressure of the defrosting structure is greater than D℃.

[0014] Further, when it is determined that the calculated load value is greater than the preset load value, the method of defrosting the defrosting structure comprises: increasing the compressor operating frequency during defrosting; and when the compressor frequency has operated to the maximum frequency during defrosting, prolonging the defrosting time.

[0015] Further, when it is determined that the calculated load value is less than the preset load value, the method of defrosting the defrosting structure comprises reducing the defrosting time.

[0016] Further, the method of defrosting the defrosting structure comprises a method of exiting defrosting, which comprises: the defrosting temperature reaches a preset value; and / or, the heat exchanger gas outlet temperature reaches a preset value; and / or, the system exhaust temperature reaches a preset value; and the defrosting duration reaches a preset value.

[0017] A heat exchanger structure suitable for the defrosting method, the heat exchanger structure comprising: an external environment temperature sensing bag; and / or, an external environment humidity sensor; and / or, a defrosting temperature sensing bag; and / or, a heat exchanger gas outlet temperature sensing bag; and / or, a system low pressure sensor.

[0018] An air conditioner suitable for the defrosting method.

[0019] Advantages:

[0020] The defrosting method comprises: detecting the environmental parameters in the most common frosting weather of the area where the defrosting structure is located and the system parameters under different starting load conditions as preset load values; detecting the environmental parameters and system parameters when the defrosting structure is currently running as calculated load values; setting the determination condition for the defrosting structure to enter the defrosting state, comparing the preset load values with the calculated load values, and adjusting the determination condition according to the comparison result; and defrosting the defrosting structure according to the determination condition. By using the above setting, the environmental parameters in the most common frosting weather of the area where the defrosting structure is located and the system parameters under different starting load conditions are compared with the environmental parameters and system parameters when the defrosting structure is currently running, the determination condition is adjusted, the timing of the defrosting structure entering the defrosting state is controlled, the defrosting cycle is adjusted, the defrosting action is timely, and the defrosting cycle is not too long, thereby avoiding the waste of time and solving the technical problem of the long defrosting time of the outdoor heat exchanger. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a flow diagram of one embodiment of the defrosting method adopted by the embodiment of the present application;

[0022] Figure 2 is a flow diagram of another embodiment of the defrosting method adopted by the embodiment of the present application. DETAILED DESCRIPTION

[0023] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0024] Reference Figure 1 , Figure 2According to the embodiment of the present application, a defrosting method is provided, comprising: detecting environmental parameters in the most common frosting weather of the area where the defrosting structure is located, and system parameters in different starting load states, as preset load values; detecting environmental parameters and system parameters of the defrosting structure in current operation, as calculated load values; setting a determination condition for the defrosting structure to enter a defrosting state, comparing the preset load values with the calculated load values, and adjusting the determination condition according to the comparison result; and defrosting the defrosting structure according to the determination condition. By using the above setting, the environmental parameters in the most common frosting weather of the area where the defrosting structure is located, and the system parameters in different starting load states are compared with the environmental parameters and system parameters of the defrosting structure in current operation, and the determination condition is adjusted, so as to control the timing of the defrosting structure to enter the defrosting state, thereby adjusting the whole defrosting period, making the defrosting action timely, and the defrosting period not too long, thereby avoiding the phenomenon of time waste, and solving the technical problem of the long defrosting time of the outdoor heat exchanger.

[0025] Specifically, the environmental parameters in the most common frosting weather of the area where the defrosting structure is located, and the system parameters in different starting load states can be obtained by statistics according to a time length.

[0026] In the defrosting method of the embodiment, referring to Figure 1 , Figure 2 , the environmental parameters include the temperature and humidity of the environment where the outdoor unit is located; the system parameters include the system low pressure of the defrosting structure, the defrosting temperature, and the heat exchanger gas outlet temperature; wherein, the defrosting temperature is the temperature of the refrigerant before entering the outdoor heat exchanger, and the heat exchanger gas outlet temperature is the temperature of the refrigerant flowing out of the outdoor heat exchanger. In this way, each parameter affecting defrosting is compared, making the control more accurate.

[0027] In the defrosting method of the embodiment, referring to Figure 1 , Figure 2 , the determination condition includes: the system parameters of the defrosting structure meet a preset relationship; and the duration that the system parameters of the defrosting structure meet the preset relationship reaches a requirement. In this way, the whole defrosting period can be adjusted, making the defrosting action timely, and the defrosting period not too long, thereby avoiding the phenomenon of time waste.

[0028] Referring to Figure 1 , Figure 2 , in the defrosting method of the embodiment, the determination condition includes: the heat exchanger gas outlet temperature - the defrosting temperature of the heat exchanger > X ℃, and the duration is Y length. In this way, the condition of the heat exchanger is judged by the inlet and outlet temperatures of the heat exchanger, which is more intuitive and easy to operate.

[0029] In the defrosting method of the embodiment, referring to Figure 1 , Figure 2The method for adjusting the determination condition according to the comparison result comprises: when the calculation load value is equal to the preset load value, not adjusting the determination condition; when the calculation load value is greater than the preset load value, reducing the value of X; and when the calculation load value is less than the preset load value, increasing the value of X.

[0030] Specifically, when the calculation load value is equal to the preset load value, it indicates that the condition of the system is the same as the default condition, and thus the determination condition is not adjusted; when the calculation load value is greater than the preset load value, it indicates that the condition of the system is more prone to frost formation compared with the default condition, and thus the value of X is reduced to make the system quickly enter the defrosting state to save time; and when the calculation load value is less than the preset load value, it indicates that the condition of the system is less prone to frost formation compared with the default condition, and thus the value of X is increased to make the system fully determine whether defrosting is needed, so as to avoid the phenomenon of insufficient defrosting. In this way, the timing of entering defrosting is more reasonable, thereby ensuring the working efficiency of the system.

[0031] Referring to Figure 1 , Figure 2 In the defrosting method of the embodiment, the case that the calculation load value is equal to the preset load value comprises: the ambient temperature where the outdoor unit is located is equal to 0℃±A℃; the ambient humidity where the outdoor unit is located is equal to B%±C%; and the temperature value corresponding to the system low pressure of the structure to be defrosted is equal to D℃±E℃.

[0032] Referring to Figure 1 , Figure 2 In the defrosting method of the embodiment, the case that the calculation load value is greater than the preset load value comprises: the ambient temperature where the outdoor unit is located is less than 0℃; the ambient temperature where the outdoor unit is located is equal to 0℃±A℃, and the ambient humidity where the structure to be defrosted is located is greater than B%; the ambient temperature where the structure to be defrosted is located is equal to 0℃±A℃, the ambient humidity where the structure to be defrosted is located is equal to B%±C%, and the temperature value corresponding to the system low pressure of the structure to be defrosted is less than D℃.

[0033] Referring to Figure 1 , Figure 2 In the defrosting method of the embodiment, the case that the calculation load value is less than the preset load value comprises: the ambient temperature where the outdoor unit is located is greater than 0℃; the ambient temperature where the outdoor unit is located is equal to 0℃±A℃, and the ambient humidity where the structure to be defrosted is located is less than B%; the ambient temperature where the structure to be defrosted is located is equal to 0℃±A℃, the ambient humidity where the structure to be defrosted is located is equal to B%±C%, and the temperature value corresponding to the system low pressure of the structure to be defrosted is greater than D℃.

[0034] Specifically, under the condition that other parameters are unchanged, the lower the outer ring temperature, the worse the defrosting effect; the higher the humidity, the worse the defrosting effect; the lower the system low pressure, the worse the defrosting effect; and under different ambient temperatures, the change of the defrosting temperature is used to determine whether the system enters defrosting, and the control is more accurate.

[0035] In the defrosting method of the embodiment, referring to Figure 1 、 Figure 2 , when it is determined that the calculated load value is greater than the preset load value, the method for defrosting the structure to be defrosted comprises: increasing the compressor operating frequency during defrosting; and prolonging the defrosting time when the compressor frequency has operated to the maximum frequency.

[0036] Specifically, since the calculated load value is large, it indicates that the defrosting condition is more severe, at this time, the compressor operating frequency during defrosting needs to be increased, and the defrosting time is prolonged when the compressor frequency has operated to the maximum frequency, so as to ensure sufficient defrosting.

[0037] Referring to Figure 1 、 Figure 2 , in the defrosting method of the embodiment, when it is determined that the calculated load value is less than the preset load value, the method for defrosting the structure to be defrosted comprises: reducing the defrosting time.

[0038] Specifically, since the calculated load value is large, it indicates that the defrosting requirement is not high, at this time, the defrosting time is reduced, thereby saving energy.

[0039] In the defrosting method of the embodiment, referring to Figure 1 、 Figure 2 , the method for defrosting the structure to be defrosted comprises a method for exiting defrosting, the method for exiting defrosting comprises: the defrosting temperature reaches a preset value; and / or, the heat exchanger gas outlet temperature reaches a preset value; and / or, the system exhaust temperature reaches a preset value; and / or, the defrosting time reaches a preset value. In this way, when the defrosting structure satisfies the condition for exiting defrosting, the defrosting is exited, thereby reducing the defrosting cycle and reducing the cost.

[0040] The heat exchanger structure of the embodiment is suitable for the defrosting method described above, and comprises: an external environment temperature sensing bag; and / or, an external environment humidity sensor; and / or, a defrosting temperature sensing bag; and / or, a heat exchanger gas outlet temperature sensing bag; and / or, a system low pressure sensor.

[0041] Specifically, the outdoor unit of the embodiment is provided with an external environment temperature sensing bag, an external environment humidity sensor, a defrosting temperature sensing bag, a heat exchanger gas outlet temperature sensing bag, and a system low pressure sensor; after being provided with the above system components, the outdoor unit can monitor the external working condition and the system operating state in real time.

[0042] The air conditioner of the embodiment is suitable for the defrosting method described above.

[0043] The defrosting method of the embodiment is described as follows:

[0044] 1. Calculated load value:

[0045] For the convenience of explanation, the calculated load value is the current outer ring parameter (temperature, humidity) and the system parameter: heat exchanger gas out, defrosting temperature, exhaust temperature, low pressure, etc. related to the unit heating operation.

[0046] 2. The preset load value:

[0047] For the convenience of explanation, the preset load value is the most common frosting weather outer ring parameter (temperature, humidity) of the unit area and the system parameter: heat exchanger gas out, defrosting temperature, exhaust temperature, low pressure, etc. related to the unit heating operation under the running condition.

[0048] 3. Comparison of calculated load value and preset load value

[0049] The comparison of the size of the calculated load value and the preset load value is the comparison of the partial parameter values under specific conditions, for example: when determining whether the system frosting is serious, the outer ring temperature and humidity are compared with the conventional frosting weather, if it is worse than the preset value, it is said that the calculated load value > preset load value. If the outer ring working condition is the same as the conventional frosting weather, the unit operating parameters: system low pressure, defrosting temperature, heat exchanger outlet temperature will be compared with the preset value (system low pressure, defrosting temperature is lower than the preset standard value), if so, it is said that the calculated load value > preset load value. A large number of experiments are needed to make this determination, because different system parameters have different effects on the frosting of the outdoor unit under different unit configurations. This embodiment only provides a comparison direction, and the specific comparison value needs to be assigned according to the specific experimental results for different system parameters.

[0050] 4. Control during operation

[0051] (1) Control before entering defrosting

[0052] When the system is running for heating, whether the unit will enter defrosting is determined by the outer ring temperature, humidity, system low pressure, and defrosting temperature, for example: when the outer ring temperature < 0℃, the humidity is high, and the system low pressure is low during operation, the outdoor unit will frost. If the current working condition and operating condition do not cause the outdoor unit to frost, the system cancels the defrosting period and normally runs for heating. Otherwise, the system will enter the pre-defrosting state, and the calculated load value will be used to control the interval time of the unit entering the defrosting mode; the specific comparison method is shown in the following example:

[0053] Assuming that the common low temperature working condition of the unit in winter is: 0℃ / humidity 70%, 100% load running smoothly, the system low pressure is -10℃, taking 100% load start as an example:

[0054] ① Determine the calculated load value = preset load value: (satisfy all the following conditions)

[0055] a) Outside ring temperature = 0°C ± 0.5°C;

[0056] b) Outside ring humidity = 70% ± 5%;

[0057] c) System low pressure = -10°C ± 2°C.

[0058] At this time, defrosting is carried out according to the preset, and the defrosting entry determination value is not adjusted; suppose the defrosting entry determination at this time is: the detected heat exchanger gas outlet temperature - defrosting temperature > 13°C for 50s.

[0059] ② Determine the load value > preset load value: (one of the following conditions can be met)

[0060] Note: The size determination is by default less than or greater than the ± range value in ①

[0061] a) At this time, the outside ring working condition < 0°C;

[0062] b) At this time, the outside ring working condition = 0°C, and the outside ring humidity > 70%;

[0063] c) At this time, the outside ring working condition = 0°C / humidity 70%, and the system low pressure < -10°C.

[0064] According to the interval, the defrosting entry determination value is lowered, for example: at this time, the outside ring is -2°C, the humidity is 80%, and the system low pressure is -10°C. According to the preset interval of this unit, the defrosting entry determination is: the detected heat exchanger gas outlet temperature - defrosting temperature > 12°C for 50s.

[0065] ③ Determine the load value < preset load value: (one of the following conditions can be met)

[0066] a) At this time, the outside ring working condition > 0°C;

[0067] b) At this time, the outside ring working condition = 0°C, and the outside ring humidity < 70%;

[0068] c) At this time, the outside ring working condition = 0°C / humidity 70%, and the system low pressure > -10°C.

[0069] According to the interval, the defrosting entry determination value is raised.

[0070] (2) Control during defrosting operation

[0071] When the system enters defrosting, control according to the determination result in (1):

[0072] When the determined load value > preset load value: at this time, the compressor operating frequency during defrosting is appropriately increased, and when the compressor frequency has been operated to the maximum frequency, the defrosting time is appropriately extended; the specific compressor frequency increase and defrosting extension time need to be adjusted in combination with the unit itself;

[0073] ② When the calculated load value is equal to the preset load value: defrosting is performed according to the default setting, and no adjustment is made.

[0074] ③ When the calculated load value is less than the preset load value: the time for defrosting is appropriately reduced, and the specific reduction time needs to be adjusted in combination with the condition of the unit itself.

[0075] (3) Control of defrosting end

[0076] When the system enters defrosting, defrosting can be exited in advance as long as any one of the following conditions is met:

[0077] ① When the defrosting temperature sensing bag, the heat exchanger air outlet temperature sensing bag, and the system exhaust temperature reach the preset value (calibrated according to the parameters when the unit is completely defrosted); note: when the external ring working condition is relatively poor, such as when the external ring humidity is relatively large and the air temperature is relatively low, the preset value will be appropriately increased according to the degree of poor working condition to ensure successful defrosting of the external unit.

[0078] ② The total time for entering defrosting reaches the set value described in (2).

[0079] After the defrosting is ended, the flow returns to the starting point, and the next cycle is repeated.

[0080] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to the process, method, product, or device.

[0081] Optionally, the specific examples in the embodiments can refer to the examples described in the above-described embodiments, and the embodiments will not be described here.

[0082] The serial numbers of the above-described embodiments of the present application are only for description, and do not represent the advantages or disadvantages of the embodiments.

[0083] In the above-described embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0084] The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A defrosting method, characterized in that, include: Detect environmental parameters under the most common frosting weather conditions in the area where the structure to be defrosted is located, and system parameters under different operating load conditions, as preset load values; The environmental and system parameters of the structure to be defrosted are detected during its current operation and used as the calculation load value. Set the determination criteria for the structure to be defrosted to enter the defrosting state, compare the preset load value with the calculated load value, and adjust the determination criteria according to the comparison result; Defrost the structure to be defrosted according to the judgment criteria; The environmental parameters include the temperature and humidity of the outdoor unit's environment; The system parameters include the system low pressure, defrost temperature, and heat exchanger outlet temperature of the structure to be defrosted; wherein, the defrost temperature is the temperature of the refrigerant before it enters the outdoor heat exchanger, and the heat exchanger outlet temperature is the temperature at which the refrigerant flows out of the outdoor heat exchanger. The determination criteria include: The system parameters of the structure to be defrosted satisfy a preset relationship; The system parameters of the structure to be defrosted satisfy the preset relationship for a duration that meets the requirements. The heat exchanger outlet temperature - the heat exchanger defrost temperature > X℃, and this lasts for Y durations; The method for adjusting the determination criteria based on the comparison results includes: When the calculated load value is equal to the preset load value, the determination condition is not adjusted; When the calculated load value is greater than the preset load value, the value of X is reduced; When the calculated load value is less than the preset load value, the value of X is increased.

2. The defrosting method according to claim 1, characterized in that, The cases where the calculated load value equals the preset load value include: The ambient temperature of the outdoor unit is 0℃±A℃; The ambient humidity of the outdoor unit is equal to B% ± C%; The temperature value corresponding to the low pressure of the system in the defrosting structure is equal to D℃ ± E℃.

3. The defrosting method according to claim 1, characterized in that, The situation where the calculated load value is greater than the preset load value includes: The ambient temperature where the outdoor unit is located is less than 0℃; The outdoor unit is located in an environment with an ambient temperature of 0℃ ± A℃, and the humidity of the environment where the defrosting structure is located is greater than B%. The ambient temperature of the structure to be defrosted is 0℃±A℃, the ambient humidity of the structure to be defrosted is B%±C%, and the temperature value corresponding to the system low pressure of the structure to be defrosted is less than D℃.

4. The defrosting method according to claim 1, characterized in that, The situation where the calculated load value is less than the preset load value includes: The ambient temperature where the outdoor unit is located is greater than 0℃; The outdoor unit is located in an environment with an ambient temperature of 0℃ ± A℃, and the humidity of the environment where the defrosting structure is located is less than B%. The ambient temperature of the structure to be defrosted is 0℃±A℃, the ambient humidity of the structure to be defrosted is B%±C%, and the temperature value corresponding to the system low pressure of the structure to be defrosted is greater than D℃.

5. The defrosting method according to claim 1, characterized in that, When the calculated load value is determined to be greater than the preset load value, the method for defrosting the structure to be defrosted includes: During the defrosting process, increase the compressor's operating frequency. During the defrosting process, when the compressor frequency has reached its maximum, the defrosting time is extended.

6. The defrosting method according to claim 1, characterized in that, When the calculated load value is determined to be less than the preset load value, the method for defrosting the structure to be defrosted includes: Reduce the defrosting time.

7. The defrosting method according to claim 1, characterized in that, The method for defrosting the structure to be defrosted includes a method for exiting defrosting, wherein the method for exiting defrosting includes: The defrosting temperature reaches the preset value; and / or, The heat exchanger outlet temperature reaches the preset value; and / or, The system exhaust temperature has reached the preset value; The defrosting time has reached the preset value.

8. A heat exchanger structure, applicable to the defrosting method according to any one of claims 1 to 7, characterized in that, The heat exchanger structure includes: An ambient temperature sensor; and / or an ambient humidity sensor; and / or a defrost temperature sensor; and / or a heat exchanger outlet temperature sensor; and / or a system low-pressure sensor.

9. An air conditioner, characterized in that, The air conditioner is applicable to the defrosting method according to any one of claims 1 to 7.

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