Fixed frequency air conditioning defrosting method
[Technical Field]
[0001] The present invention relates to the field of air conditioning technology, and more particularly to an air conditioning defrosting method, and more particularly to a fixed frequency air conditioning defrosting method.
【Background technique】
[0002] When the air conditioner is in the heating operation, if the outdoor ambient temperature is below the freezing point and the air has a certain humidity, the surface of the outdoor heat exchanger is prone to frost. The presence of frost affects the heating performance of the air conditioner. Therefore, during the air conditioning heating operation, it is necessary to enter the defrost mode for defrosting. Since the air conditioner operates in the defrosting mode, the indoor heat exchanger evaporates and absorbs heat, the indoor temperature drops, and the user's comfort is lowered. Therefore, the defrosting mode of the air conditioner greatly affects the heating performance and the comfort of the air conditioner.
[0003] For fixed-frequency air conditioners, the currently commonly used defrosting method is based on the indoor coil temperature and the compressor running time, and the indoor coil temperature is lower than the set temperature, and the compressor cumulative running time and/or When the continuous running time reaches the set running time, the air conditioner is controlled to enter the defrost mode for defrost. With this existing defrosting method, the cumulative running time or continuous running time of the compressor is required to reach a certain running time, and if the running time is not reached, defrosting will not be performed. However, if the defrosting is not clean due to various reasons during defrosting, if the outdoor humidity is too large, if the defrosting is not timely, the outdoor heat exchanger will easily freeze, and the icing will not be easily removed; and the defrosting mode will be re-entered. If there is still a problem of defrosting in the frost, the icing phenomenon is more serious, resulting in poor heat exchange capacity of the outdoor heat exchanger.
[Content of the Invention]
[0004] An object of the present invention is to provide a fixed frequency air conditioning defrosting method to solve the problem of the prior art that the heat exchange performance of the outdoor heat exchanger is degraded due to the inability to defrost in time.
In order to achieve the above object, the present invention is implemented by the following technical solutions:
A fixed frequency air conditioner defrosting method, comprising:
During the air conditioning heating operation, obtaining the indoor coil temperature and the number of times the defrosting mode is operated during the set time period; comparing the indoor coil temperature with the first set indoor coil temperature, the operation is performed The number of defrost modes is compared with the set number of times;
If the indoor coil temperature is less than the first set indoor coil temperature, and the number of the running defrosting modes in the set time period is greater than or equal to the set number of times, the air conditioning operation is forcibly removed Frost mode for defrosting;
The number of times the defrosting mode is operated includes the number of times the normal defrosting mode is operated and the number of times the forced defrosting mode is operated.
[0006] The fixed-frequency air-conditioning defrosting method as described above, wherein the indoor retort temperature is less than the first set indoor coil temperature, and the operating defrosting is within the set time period When the number of times of the mode is greater than or equal to the set number of times, the air conditioning operation forced defrosting mode is controlled to perform defrosting, specifically:
And if the indoor coil temperature is less than the first set indoor coil temperature and continues for a first set time, and the number of the running defrosting modes in the set time period is greater than or equal to the setting When the number of times, the air conditioner operates the forced defrosting mode to perform defrosting.
[0007] The fixed frequency air conditioning defrosting method as described above, wherein the defrosting time of operating the forced defrosting mode is greater than the defrosting time of operating the conventional defrosting mode.
[0008] Preferably, the first set indoor coil temperature is a variable temperature that is inversely proportional to the operating speed of the indoor fan.
[0009] The fixed-frequency air-conditioning defrosting method as described above adopts the following process to determine the first set indoor coil temperature: obtaining the real-time running speed of the indoor fan, according to the known fan speed and the forced defrosting mode. Corresponding relationship between the indoor coil temperature determines the first set indoor coil temperature corresponding to the real-time running speed of the indoor fan.
[0010] The fixed frequency air conditioning defrosting method as described above controls the air conditioner to operate the conventional defrosting mode when any of the following conditions are satisfied:
Condition 1. The indoor unit enters the overload protection and the outdoor fan stops. When the outdoor fan is turned on again and continues to operate for more than the second set time, and the cumulative running time of the compressor exceeds the third set time, and the continuous running time of the compressor exceeds a fourth set time, and the indoor coil temperature is less than the second set indoor coil temperature;
Condition 2: the continuous operation time of the compressor exceeds a fifth set time, the indoor coil temperature decreases to a third set temperature every sixth set time and appears three times continuously, and the indoor coil temperature is less than the second set Set the indoor coil temperature, and the compressor is turned on again for more than the seventh set time;
Condition 3: the cumulative running time of the compressor exceeds an eighth set time, and the continuous running time of the compressor exceeds the fourth set time, and the indoor coil temperature is less than the temperature of the second set indoor coil;
Condition 4: The difference between the indoor coil temperature and the indoor temperature is less than the fourth set temperature and continues for the ninth set time, and the cumulative operation time of the compressor exceeds the third set time, and the continuous running time of the compressor The fourth set time is exceeded, and the indoor coil temperature is less than the second set indoor coil temperature.
[0011] The constant frequency air conditioning defrosting method as described above, wherein the first set indoor coil temperature is less than the second set indoor coil temperature.
[0012] Preferably, the second set indoor coil temperature is a variable temperature that is inversely proportional to the operating speed of the indoor fan.
[0013] The fixed-frequency air-conditioning defrosting method as described above, the following process is used to determine the second set indoor coil temperature: obtaining the real-time operating speed of the indoor fan, according to the known fan speed and the conventional defrosting mode. Corresponding relationship between the indoor coil temperature determines the second set indoor coil temperature corresponding to the real-time operating speed of the indoor fan.
[0014] Compared with the prior art, the advantages and positive effects of the present invention are: using the fixed frequency air conditioning defrosting method of the present invention, during the air conditioning heating operation, if the defrosting mode is operated within a set period of time The number of times exceeds the set number, and the indoor coil temperature is lower than the first set indoor coil temperature, indicating that although the defrosting frequency is high, the heat exchange performance of the outdoor heat exchanger is still degraded. The possible reason is that the outdoor heat exchanger is defrosted. It is not clean and freezes. In this case, the air conditioner is operated to control the forced defrost mode to perform forced defrosting without being restricted by the running time of the compressor, so as to avoid the change of the outdoor heat exchanger due to the inability to defrost in time and the serious icing. A decrease in thermal performance.
[0015] Other features and advantages of the present invention will become more apparent after reading the <RTIgt;
/H- ο
[Description of the Drawings]
1 is a flow chart of an embodiment of a fixed frequency air conditioning defrosting method of the present invention.
【detailed description】
The present invention will be further described in detail below with reference to the drawings and embodiments.
[0018] Please refer to FIG. 1, which is a flow chart of an embodiment of a method for defrosting a fixed frequency air conditioner according to the present invention.
[0019] As shown in FIG. 1, the method for implementing the defrosting of the fixed frequency air conditioner of the embodiment comprises the forced defrosting process constituted by the following steps:
Step 11: During the air conditioning heating operation, obtain the indoor coil temperature and the number of times the defrosting mode is operated during the set time period.
[0020] During the air conditioning heating operation, the indoor coil temperature and the number of times the defrosting mode is operated in the set time period are acquired in real time according to the set sampling frequency. Wherein, the indoor coil temperature can be detected by a temperature sensor disposed on the indoor heat exchanger coil, and the controller of the air conditioner is used to acquire and process the detected value of the temperature sensor; and the number of running the defrosting mode includes the air conditioning operation routine The number of defrost modes and the number of times the forced defrost mode is run, which can be counted by the controller of the air conditioner for the number of times the defrost mode is run each time. The conventional defrosting mode refers to a defrosting mode adopted by the prior art based on the indoor coil temperature and the compressor running time as a basis for judging. Then, combined with the timing device of the controller itself, the number of times the defrosting mode is operated within the set time period can be conveniently obtained. Wherein, the set time period is a time period that is known to be stored in the air conditioner and can be acquired by the controller, in particular, a time period related to the air conditioning operating parameter and the air conditioning operating environment, and can reflect the air conditioning system. The degree of frosting of the outdoor heat exchanger during hot running. For example, the preset time period is preset to 150 minutes. Moreover, the set time period can be artificially modified or adaptively modified by a setting algorithm.
[0021] Step 12: Comparing the indoor coil temperature with the first set indoor coil temperature, and comparing the number of times the defrosting mode is operated with the set number of times.
[0022] The first set indoor coil temperature and the set number of times are all known values that are pre-stored in the air conditioner and obtainable by the controller. For example, the first set indoor coil temperature is 36 ° C, the number of settings is 3 times. Moreover, these two values can be artificially modified according to air conditioning operating parameters, air conditioning operating environment, etc. or adaptively modified by a setting algorithm.
[0023] After obtaining the indoor coil temperature and the number of times the defrosting mode is operated in step 11, the indoor coil temperature is compared with the first set indoor coil temperature, and the number of times the defrosting mode is operated and the set number of times are set. The comparison determines whether the forced defrosting mode needs to be performed based on the comparison result.
[0024] Step 13: If the indoor coil temperature is less than the first set indoor coil temperature, and the number of running defrosting modes within the set time period is greater than or equal to the set number of times, the air conditioning operation forced defrosting mode is controlled to perform Defrost.
[0025] That is, if the condition that the indoor coil temperature is less than the first set indoor coil temperature and the number of operating the defrosting mode in the set time period are not less than the set number, for example, the indoor tray is simultaneously satisfied. When the tube temperature is less than 36 °C, the number of times the air conditioning defrosting mode is operated within 150 minutes is greater than or equal to 3 times, indicating that the defrosting frequency is high, and the heat exchange performance of the outdoor heat exchanger is poor, which indicates that there is a high possibility of outdoor heat. The exchanger freezes because the defrosting is not clean. In this case, regardless of whether the cumulative running time of the compressor and the continuous running time have reached the corresponding set time, the forced defrosting mode of the air conditioning operation is controlled to avoid the serious icing of the outdoor heat exchanger due to the inability to defrost in time. The risk of a sharp drop in heat transfer performance of the outdoor heat exchanger.
Moreover, when the forced defrosting mode is operated, it is preferable that the defrosting time in the forced defrosting mode is larger than the defrosting time in the conventional defrosting mode in order to perform a more powerful defrosting process. For example, if the defrost time in the conventional defrost mode is 9 min, the defrost time in the forced defrost mode is greater than 9 min, for example, I Imin.
[0027] As a more preferred embodiment, in the comparison and determination process of step 12 and step 13, it is determined that the indoor coil temperature is less than the first set indoor coil temperature and continues for the first set time, and is set. It is determined that the forced defrosting mode needs to be run when the number of times the defrosting mode is operated within the time period is not less than the set number of times. That is, for the temperature determination condition, not only the indoor coil temperature is required to be smaller than the first set indoor coil temperature, but also the temperature condition is required to be continuously satisfied within the first set time, thereby avoiding the indoor coil caused by other factors. The temperature drop causes a misjudgment of the icing condition of the outdoor heat exchanger. The first set time is also a known value that is pre-stored in the air conditioner and obtainable by the controller. For example, the first set time is 15 minutes. Moreover, the value of the first set time may be artificially modified according to the air conditioning operating parameter, the air conditioning operating environment, or the like, or adaptively modified by the setting algorithm.
[0028] The first set indoor coil temperature as the reference temperature in the temperature determination condition may be a relatively fixed value without updating, for example, 36 ° C without updating, or according to Air conditioning operating parameters, air conditioning operating environment, etc. were artificially modified to 38 °C. As a more preferred embodiment, the first set indoor coil temperature is a variable temperature, and is the operating speed of the indoor fan.
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