AN AIR CONDITIONER DEFROSTING METHOD

Abstract

An air conditioner defrosting method. In the air conditioner’s heating process, after the end of every defrosting procedure, the temperature of the outdoor heat exchanger coil and the time used over the course of the defrosting procedure can be measured and recorded. The defrosting situation of the air conditioner is reflected, and an initial determination of whether there is frost accumulation is made. After the initial determination, the air conditioner continues carrying out the heating procedure, and when specific conditions are met, it carries out a third defrosting procedure. When second determination results indicate that there is frost accumulation, the frost accumulation problem is deemed to be quite severe with a risk of icing up, and it is necessary to conduct forced intervention and carry out forced defrosting steps.

Description

Claims

1. An air conditioner defrosting method comprising: Defrosting Step S1: Carry out a first defrosting procedure, and measure and record the outdoor heat exchanger coil temperature T1 after the first defrosting procedure and/or the time t1 used for the first defrosting procedure;Defrosting Step S2: Carry out a second defrosting procedure, and measure and record the outdoor heat exchanger coil temperature T2 after the second defrosting procedure and/or the time t2 used for the second defrosting procedure;Initial Determination Step S3: When first preset conditions are met, initial determination is that there is frost accumulation;Defrosting Step S4: After it is initially determined that there is frost accumulation, carry out a third defrosting procedure, and measure and record the outdoor heat exchanger coil temperature after the third defrosting procedure T3 and/or the time used for the third defrosting procedure t3;Second Determination Step S5: When second preset conditions are met, it is determined that there is frost accumulation;Forced Defrosting Step S6: After it is determined that there is frost accumulation, carry out a forced defrosting procedure.

2. The air conditioner defrosting method according to claim 1, characterized in that the first preset conditions are: the outdoor heat exchanger coil temperature after the second defrosting procedure T2 is less than the outdoor heat exchanger coil temperature after the first defrosting procedure T1, and/or the time used for the second defrosting procedure t2 is greater than or equal to the time used for the first defrosting procedure t1.

3. The air conditioner defrosting method according to claim 2, characterized in that the first preset conditions also include: the outdoor heat exchanger coil temperature after the second defrosting procedure T2 is less than 0° C.

4. The air conditioner defrosting method according to claim 1, characterized in that the second preset conditions are: the relationship among the outdoor heat exchanger coil temperature after the first defrosting procedure T1, the outdoor heat exchanger coil temperature after the second defrosting procedure T2, and the outdoor heat exchanger coil temperature after the third defrosting procedure T3 satisfies T3<T2<T1, and/or the relationship among the time used for the first defrosting procedure t1, the time used for the second defrosting procedure t2, and the time used for the third defrosting procedure t3 satisfies t3≥t2≥t1.

5. The air conditioner defrosting method according to claim 4, characterized in that the second preset conditions also include: the relationship among the outdoor heat exchanger coil temperature after the first defrosting procedure T1, the outdoor heat exchanger coil temperature after the second defrosting procedure T2, and the outdoor heat exchanger coil temperature after the third defrosting procedure T3 satisfies |T2-T1|<|T3-T2|.

6. The air conditioner defrosting method according to claim 1, characterized in that the first defrosting procedure, the second defrosting procedure, and the third defrosting procedure are general defrosting procedures.

7. The air conditioner defrosting method according to claim 6, characterized in that the general defrosting procedure is: running a compressor at a first frequency to conduct defrosting, and exiting the defrosting procedure after a first specified length of time.

8. The air conditioner defrosting method according to claim 7, characterized in that the forced defrosting procedure is running a compressor at a second frequency to conduct defrosting until a condition for exiting forced defrosting is met, wherein the second frequency is greater than the first frequency.

9. The air conditioner defrosting method according to claim 8, characterized in that the condition for exiting forced defrosting is: the outdoor heat exchanger coil temperature T4 in the forced defrosting procedure is greater than or equal to a specified temperature, and it is kept greater than or equal to the specified temperature for a second specified length of time.

10. The air conditioner defrosting method according to claim 2, characterized in that the outdoor heat exchanger coil temperature after the first defrosting procedure T1, the outdoor heat exchanger coil temperature after the second defrosting procedure T2, the outdoor heat exchanger coil temperature after the third defrosting procedure T3, and the outdoor heat exchanger coil temperature in the forced defrosting procedure T4 are measured using a temperature measuring device located at the bottom of the outdoor heat exchanger.