A method for controlling an air conditioner outdoor fan during heating

Abstract

The present application relates to air conditioning technology field, specifically to a kind of heating air conditioner outdoor fan control method, when indoor coil temperature is too high or too low, by reducing or raising outdoor fan gear to stabilize compressor frequency, ensure system stability, the rotating speed of outdoor fan is calculated by formula (1), Y=A*(F*T ir +G)(1)Wherein, Y is the rotating speed of outdoor fan, unit is r / min;T ir It is indoor coil temperature, G is compensation coefficient;F is correction coefficient;A is calculated by formula (2), A=(T ir(n‑1) -T ir(n‑2) ) / (T ir(n) -T ir(n‑1) )(2)Wherein, T ir(n) It is the indoor coil temperature of n time, T ir(n‑1) It is the indoor coil temperature of n-1 time T ir(n‑2) It is the indoor coil temperature of n-2 time.Stabilize system cycle, increase system reliability, comfort.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, specifically to a method for controlling the outdoor fan of an air conditioner during heating. Background Technology

[0002] While heating control technology is relatively mature under rated operating conditions, temperature and pressure control of air conditioning systems becomes more complex under overload and high-temperature heating conditions. Due to the high outdoor ambient temperature, the system's suction pressure is high, resulting in correspondingly high exhaust pressure. Currently, most inverter air conditioners on the market operate by reducing their frequency during high-temperature heating. Improper control can lead to frequent frequency fluctuations, large fluctuations in outlet air temperature, poor stability, and even system failure, resulting in a poor user experience. Therefore, a stable and reliable control method is urgently needed. Summary of the Invention

[0003] The purpose of this invention is to provide a method for controlling the outdoor fan of an air conditioner during heating, so as to solve the problem in the background art that it is difficult to control the stable air outlet temperature and intake and exhaust pressure of the air conditioner under overload and high temperature heating conditions.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a method for controlling the outdoor fan of an air conditioner during heating. When the indoor coil temperature is too high or too low, the compressor frequency is stabilized by lowering or raising the outdoor fan speed to ensure system stability. The outdoor fan speed is adjusted by calculating the outdoor fan speed, which is calculated using formula (1).

[0005] Y = A * (F * T) ir +G) (1)

[0006] Where Y is the outdoor fan speed, in r / min; T ir Where is the indoor coil temperature, G is the compensation coefficient, F is the correction coefficient, and A is calculated using formula (2).

[0007] A = (T) ir(n-1) -T ir(n-2) ) / (T ir(n) -T ir(n-1) (2)

[0008] Among them, T ir(n) Let T be the indoor coil temperature at time n. ir(n-1) Let T be the indoor coil temperature at time n-1. ir(n-2) Let A be the indoor coil temperature at time n-2. The value of A ranges from 0.6 to 1.2. If the calculated value is less than 0.6, use 0.6; if it is greater than 1.2, use 1.2. When T... ir(n-1) -T ir(n-2) =0 or T ir(n) -Tir(n-1) When the value is 0, the calculation is invalid, the fan speed protection remains unchanged, and the calculation continues in the next sampling cycle.

[0009] Preferably, the outdoor fan has 8 speed settings.

[0010] Level 0: When Y < 200, the outdoor fan stops;

[0011] Level 1: When 200≤Y<300, the outdoor fan speed is adjusted to 250r / min;

[0012] Level 2: When 300≤Y<400, the outdoor fan speed is adjusted to 350r / min;

[0013] Level 3: When 400≤Y<500, the outdoor fan speed is adjusted to 450r / min;

[0014] Level 4: When 500≤Y<600, the outdoor fan speed is adjusted to 550r / min;

[0015] Level 5: When 600≤Y<700, the outdoor fan speed is adjusted to 650r / min;

[0016] Level 6: When 700≤Y<800, the outdoor fan speed should be adjusted to 750r / min;

[0017] Level 7: When 800≤Y, the outdoor fan speed is adjusted to 850r / min.

[0018] Preferably, the value of F is taken according to the outdoor ambient temperature range, namely F1=20, F2=16, F3=13, F4=7.5, and F5=5.

[0019] Preferably, the value of G is determined according to the outdoor coil temperature, and is G1 = -25, G2 = -20, and G3 = -15.

[0020] Preferably, the sampling period is 10 seconds.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] Based on the outdoor ambient temperature and the air conditioning coil temperature, the outdoor fan speed is continuously adjusted to control system pressure, stabilize system circulation, and increase system reliability and comfort; under extreme operating conditions, the compressor is guaranteed to operate at a higher frequency, which is conducive to system oil return and avoids liquid return. Attached Figure Description

[0023] Figure 1 This is a graph showing the relationship between outdoor ambient temperature and the value of F in this invention.

[0024] Figure 2This is a graph showing the relationship between the outdoor coil temperature and the value of G in this invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1

[0027] This embodiment provides a technical solution: a method for controlling the outdoor fan of an air conditioner during heating. When the indoor coil temperature is too high or too low, the compressor frequency is stabilized by lowering or raising the outdoor fan speed to ensure system stability. The outdoor fan speed is adjusted by calculating the outdoor fan speed, which is calculated using formula (1).

[0028] Y = A * (F * T) ir +G) (1)

[0029] Where Y is the outdoor fan speed, in r / min; T ir Where is the indoor coil temperature, G is the compensation coefficient, F is the correction coefficient, and A is calculated using formula (2).

[0030] A = (T) ir(n-1) -T ir(n-2) ) / (T ir(n) -T ir(n-1) (2)

[0031] Among them, T ir(n) Let T be the indoor coil temperature at time n. ir(n-1) Let T be the indoor coil temperature at time n-1. ir(n-2) Let A be the indoor coil temperature at time n-2. The value of A ranges from 0.6 to 1.2. If the calculated value is less than 0.6, use 0.6; if it is greater than 1.2, use 1.2. When T... ir(n-1) -T ir(n-2) =0 or T ir(n) -T ir(n-1) When the value is 0, the calculation is invalid, the fan speed protection remains unchanged, and the calculation continues in the next sampling cycle, which is 10s.

[0032] The outdoor fan has 8 speed levels, and the specific fan speed and Y value corresponding to each level are shown in Table 1.

[0033] Table 1

[0034]

[0035] In this embodiment, the outdoor ambient temperature is 7°C. Figure 1 The horizontal axis represents outdoor ambient temperature, divided into multiple temperature ranges: less than 0, 0-2, 2-10, 10-12, 12-20, 20-22, 22-30, 30-32, and greater than 32. F = F2 = 16. The indoor ambient temperature is 20℃. After startup, the outdoor fan is at speed level 6. After running for a period of time, the outdoor coil temperature is 2℃. Based on... Figure 2 The horizontal axis represents the outdoor coil temperature, divided into several temperature ranges: less than 3, 3-5, 5-7, 7-10, and greater than 10. G = G3 = -15, T ir(n) =48℃, T ir(n-1) =47℃, T ir(n-2) =46℃,

[0036] A = (T) ir(n-1) -T ir(n-2) ) / (T ir(n) -T ir(n-1) )=(47-46) / (48-47)=1

[0037] Y = A * (F * T) ir +G)=1*(16*48-15)=753

[0038] 700 < Y = 753 < 800. At this time, the indoor coil temperature is normal, the rate of increase is stable, and the fan speed is maintained at level 6.

[0039] Example 2

[0040] In this embodiment, the outdoor ambient temperature is 25℃. Figure 1 The horizontal axis represents outdoor ambient temperature, divided into multiple temperature ranges: less than 0, 0-2, 2-10, 10-12, 12-20, 20-22, 22-30, 30-32, and greater than 32. F = F4 = 7.5. The indoor ambient temperature is 25℃. After startup, the outdoor fan is at speed level 3. After running for a period of time, the outdoor coil temperature reaches 10℃. According to... Figure 2 The horizontal axis represents the outdoor coil temperature, divided into several temperature ranges: less than 3, 3-5, 5-7, 7-10, and greater than 10. G = G1 = -25, T ir(n) =50℃, T ir(n-1) =48.5℃, T ir(n-2) =47.5℃,

[0041] A = (T) ir(n-1) -T ir(n-2) ) / (T ir(n) -T ir(n-1)= (48.5-47.5) / (50-48.5)≈0.67

[0042] Y = A * (F * T) ir +G)=0.67*(7.5*45-25)≈209

[0043] 200<Y≈209<300, at this time the indoor coil temperature is high and the rate of increase is fast, the fan speed should be reduced, and according to the above calculation, the fan speed should be adjusted to level 1.

[0044] When the outdoor ambient temperature and indoor coil temperature are too high (and the exhaust pressure is correspondingly high), the outdoor fan speed is reduced to lower the intake pressure, thereby slowing down the rate of increase in exhaust pressure, stabilizing the compressor frequency, and ensuring system stability.

[0045] Example 3

[0046] In this embodiment, the outdoor ambient temperature is -5℃. Figure 1 The horizontal axis represents outdoor ambient temperature, divided into multiple temperature ranges: less than 0, 0-2, 2-10, 10-12, 12-20, 20-22, 22-30, 30-32, and greater than 32. F = F1 = 20. The indoor ambient temperature is 15℃, the indoor set temperature is 30℃, and the outdoor fan speed is set to level 6 after startup. After running for a period of time, the outdoor coil temperature drops to -10℃. According to... Figure 2 The horizontal axis represents the outdoor coil temperature, divided into several temperature ranges: less than 3, 3-5, 5-7, 7-10, and greater than 10. G = G3 = -15, T ir(n) =41℃, T ir(n-1) =39.8℃, T ir(n-2) =38.5℃,

[0047] A = (T) ir(n-1) -T ir(n-2) ) / (T ir(n) -T ir(n-1) = (39.8 - 38.5) / (41 - 39.8) ≈ 1.08

[0048] Y = A * (F * T) ir +G)=1.08*(20*41-15)≈869

[0049] 800<Y≈869, at this time the indoor coil temperature is low and the rate of increase is slow, the fan speed should be increased quickly, and according to the above calculation, the fan speed should be adjusted to level 7.

[0050] When the indoor coil temperature rises too quickly, the outdoor fan reacts rapidly, adjusting its speed according to the heating rate and temperature to prevent high-pressure and high-temperature alarms.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for controlling an outdoor fan of an air conditioner during heating, characterized in that, When the indoor coil temperature is too high or too low, the compressor frequency is stabilized by lowering or raising the outdoor fan speed to ensure system stability. The outdoor fan speed is adjusted by calculating the outdoor fan speed, which is calculated using formula (1). Y=A×(F× T ir +G)(1) Where Y is the outdoor fan speed, in r / min; T ir Where is the indoor coil temperature, G is the compensation coefficient, F is the correction coefficient, and A is calculated using formula (2). A=(T ir(n-1) - T ir(n-2) ) / (T ir(n) - T ir(n-1) )(2) Among them, T ir(n) Let T be the indoor coil temperature at time n. ir(n-1) Let T be the indoor coil temperature at time n-1. ir(n-2) Let A be the indoor coil temperature at time n-2. The value of A ranges from 0.6 to 1.

2. If the calculated value is less than 0.6, use 0.6; if it is greater than 1.2, use 1.

2. When T... ir(n-1) - T ir(n-2) =0 or T ir(n) - T ir(n-1) When =0, the calculation is invalid, the fan speed protection remains unchanged, and the calculation continues in the next sampling cycle; The outdoor fan has 8 speed settings. Level 0: When Y < 200, the outdoor fan stops; Level 1: When 200 ≤ Y < 300, the outdoor fan speed is adjusted to 250 r / min; Level 2: When 300 ≤ Y < 400, the outdoor fan speed is adjusted to 350 r / min; Level 3: When 400 ≤ Y < 500, the outdoor fan speed should be adjusted to 450 r / min; Level 4: When 500 ≤ Y < 600, the outdoor fan speed is adjusted to 550 r / min; Level 5: When 600 ≤ Y < 700, the outdoor fan speed should be adjusted to 650 r / min; Level 6: When 700 ≤ Y < 800, the outdoor fan speed should be adjusted to 750 r / min; Level 7: When 800 ≤ Y, the outdoor fan speed is adjusted to 850 r / min; The value of F is determined based on the outdoor ambient temperature range, specifically F1=20, F2=16, F3=13, F4=7.5, and F5=5; the outdoor ambient temperature ranges are as follows: When the outdoor ambient temperature is less than 0℃, F is taken as F1=20; When the outdoor ambient temperature is between 0 and 2℃, the value of F is: When the outdoor ambient temperature rises from <0℃ to between 0 and 2℃, the value of F is F1 = 20. When the outdoor ambient temperature drops from >2℃ to between 0~2℃, the value of F is F2=16; When the outdoor ambient temperature range is 2-10℃, the value of F is F2=16; When the outdoor ambient temperature is in the range of 10-12℃, the value of F is: When the outdoor ambient temperature rises from <10℃ to between 10~12℃, the value of F is F2=16. When the outdoor ambient temperature drops from >12℃ to between 10~12℃, the value of F is F3=13; When the outdoor ambient temperature range is 12-20℃, the value of F is F3=13; When the outdoor ambient temperature is between 20-22℃, the value of F is: When the outdoor ambient temperature rises from <20℃ to between 20~22℃, F is taken as F3=13. When the outdoor ambient temperature drops from >22℃ to between 20~22℃, F is taken as F4=7.5; When the outdoor ambient temperature is between 22-30℃, the value of F is F4=7.5; When the outdoor ambient temperature is between 30-32℃, the value of F is: When the outdoor ambient temperature rises from <30℃ to between 30~32℃, F is taken as F4=7.

5. When the outdoor ambient temperature drops from >32℃ to between 30~32℃, F is taken as F4=5; When the outdoor ambient temperature range is greater than 32℃, F is taken as F5=5; The value of G is determined based on the outdoor coil temperature range, specifically G1=-25, G2=-20, and G3=-15; the outdoor coil temperature ranges are as follows: When the outdoor coil temperature range is less than 3℃, G is taken as G3=-15; When the outdoor coil temperature is in the range of 3-5℃, the value of G is: When the outdoor coil temperature rises from <3℃ to between 3~5℃, G is taken as G3=-15. When the outdoor coil temperature drops from >5℃ to between 3~5℃, G is taken as G2=-20; When the outdoor coil temperature range is 5-7℃, G is taken as G2=-20; When the outdoor coil temperature is in the range of 7-10℃, the value of G is: When the outdoor coil temperature rises from <7℃ to between 7~10℃, G is taken as G2=-20. When the outdoor coil temperature drops from >10℃ to between 7~10℃, G is taken as G1=-25; When the outdoor coil temperature range is greater than 10℃, G is taken as G1=-25.

2. The method for controlling the outdoor fan of an air conditioner during heating according to claim 1, characterized in that: The sampling period is 10 seconds.

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