CN104633862A - Control method of electronic expansion valve in refrigeration operation of variable frequency air conditioner - Google Patents
Control method of electronic expansion valve in refrigeration operation of variable frequency air conditioner Download PDFInfo
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- CN104633862A CN104633862A CN201510055997.5A CN201510055997A CN104633862A CN 104633862 A CN104633862 A CN 104633862A CN 201510055997 A CN201510055997 A CN 201510055997A CN 104633862 A CN104633862 A CN 104633862A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000009825 accumulation Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 230000036632 reaction speed Effects 0.000 abstract description 3
- 238000005192 partition Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a control method of an electronic expansion valve in refrigeration operation of a variable frequency air conditioner. The standard opening degree of the electronic expansion valve is equal to the product of a standard opening degree coefficient and the frequency of a compressor. The value of the standard opening degree coefficient is relevant to the temperature of an outdoor environment and the frequency of the compressor. When the outdoor temperature and/or the frequency of the compressor changes, the electronic expansion valve can be adjusted to the optimal opening degree quickly and reasonably. The reasonability of adjustment of the electronic expansion valve can be improved, the reaction speed of adjustment of the electronic expansion valve can be increased, the refrigeration effect of the air conditioner is improved, and the refrigeration efficiency of the air conditioner is fully improved.
Description
[ technical field ]
The invention relates to an air conditioner control method, in particular to a control method of an electronic expansion valve during refrigeration running of a variable frequency air conditioner.
[ background art ]
At present, the popularity of the variable frequency air conditioner is gradually increased, and more variable frequency air conditioners which use the electronic expansion valve as a throttling element are provided. The existing variable frequency air conditioner generally adopts return air superheat degree control, and the return air superheat degree refers to the difference value between the return air temperature of a compressor and the temperature of an evaporator. The superheat is set to a target range, and when the degree of superheat is greater than the upper limit of the target range, the opening degree of the expansion valve is increased, and when the degree of superheat is less than the lower limit of the target range, the opening degree of the expansion valve is decreased, in order to maintain the degree of superheat of the return gas within the set target range.
Two return air superheat degree control methods are common:
firstly, setting the valve opening corresponding to the frequency of the compressor by a program, and not adjusting the valve opening within 7 minutes after the compressor is started; the electronic expansion press presses the opening of a valve corresponding to the frequency of the compressor; after 7 minutes, the opening of a valve corresponding to the frequency of the compressor is controlled and adjusted in combination with the control of the superheat degree of returned air. The disadvantage is that when the outdoor ambient temperature suddenly rises or falls, this method can only change the reference valve opening when the compressor frequency changes. The outdoor environment is changed by the method that the opening degree of a reference valve cannot be adjusted, only the heat degree can be adjusted, but the superheat degree is slowly adjusted, so that when the outdoor temperature changes suddenly, the outdoor temperature cannot be quickly adjusted to the proper opening degree, the refrigeration effect of the air conditioner is influenced, and the refrigeration efficiency of the air conditioner is reduced.
The second one is that the program sets the valve opening corresponding to the outdoor environment temperature first, the valve opening is not adjusted within 7 minutes after the compressor is started, and the electronic expansion is performed according to the valve opening corresponding to the outdoor environment temperature; after 7 minutes, the opening of the valve corresponding to the outdoor temperature and the superheat degree of return air are controlled and combined for adjustment. The disadvantage is that this method only changes the reference valve opening when the outdoor temperature changes. The frequency change of the compressor cannot adjust the valve opening of the reference, the valve opening can be adjusted only by the heat degree, but the adjustment of the heat degree is slow; therefore, when the frequency of the compressor changes suddenly, the expansion valve cannot be adjusted to a proper opening rapidly, the refrigeration effect of the air conditioner is affected, and the refrigeration efficiency of the air conditioner is reduced.
The two control methods are not precise enough and have certain limitations, and when the outdoor temperature or the frequency of the compressor suddenly changes or the outdoor temperature and the frequency of the compressor simultaneously change, the adjusting method is single, and the opening of the valve cannot be rapidly adjusted in all directions, so that the valve cannot be rapidly and accurately adjusted to the most appropriate opening of the refrigerating system. The refrigeration effect of the air conditioner is influenced, and even the expansion valve has the risk of overshoot.
[ summary of the invention ]
The invention aims to provide a control method of an electronic expansion valve during refrigeration running of a variable frequency air conditioner, which has good energy-saving effect and can adjust the reference opening degree of the electronic expansion valve according to the outdoor environment temperature and the compressor frequency no matter the outdoor temperature or the compressor frequency changes.
In order to solve the technical problem, the invention adopts the technical scheme that a control method of an electronic expansion valve during the refrigeration running of an inverter air conditioner is characterized in that the reference opening degree of the electronic expansion valve is equal to the reference opening degree coefficient multiplied by the frequency of a compressor; the value of the reference opening coefficient is related to the outdoor ambient temperature and the compressor frequency.
According to the control method of the electronic expansion valve during the refrigeration operation of the variable frequency air conditioner, the outdoor environment temperature is divided into a plurality of subareas according to the temperature; each outdoor environment temperature zone corresponds to a plurality of reference opening coefficients according to the frequency of the compressor.
In the control method of the electronic expansion valve during the refrigeration running of the variable frequency air conditioner, during the running process of the air conditioner, the opening degree of the electronic expansion valve consists of the reference opening degree and the compensation value, the numerical value of the return air superheat degree is judged according to the set interval time, the compensation value is determined according to the size of the return air superheat degree, and compensation accumulation is carried out:
the superheat degree Ts of returned air is Tsu-Te;
wherein,
tsu: the return air temperature of the compressor;
te: evaporator temperature;
1) the return air superheat degree is larger than a set upper limit value, and the valve opening degree is equal to the current opening degree plus a compensation value;
compensation value K2 × (V _ ing/(((V _ max-V _ min)/2) + V _ min)) × (Ts-T1);
2) the degree of superheat of the return air is between the set upper limit and the set lower limit, and the valve opening degree is kept unchanged;
3) the return air superheat degree is smaller than a set lower limit value, and the valve opening degree is equal to the current opening degree-compensation value.
Compensation value K2 × (V _ ing/(((V _ max-V _ min)/2) + V _ min)) × (T2-Ts);
k2 is a set compensation coefficient;
t1, upper limit of refrigeration superheat degree;
t2, lower limit of refrigeration superheat degree;
v _ max is the maximum opening of the valve;
v _ min is the minimum opening degree of the valve;
v _ ing is the current opening degree of the electronic expansion valve.
In the control method of the electronic expansion valve during the refrigeration operation of the variable frequency air conditioner, the default value of the compensation coefficient is 8; the default value of the upper limit of the refrigeration superheat degree is 4; the default value of the lower limit of the refrigeration superheat degree is 0; the default value of the maximum working opening of the valve is 480; the default value for the minimum opening for valve operation is 90.
According to the control method of the electronic expansion valve during the refrigeration running of the variable frequency air conditioner, the reference opening value is recalculated when the frequency of the compressor and/or the outdoor temperature change during the running process of the air conditioner; the opening degree of the electronic expansion valve is an algebraic sum of a recalculated reference opening degree value and a previously accumulated compensation value.
According to the control method of the electronic expansion valve during the refrigeration running of the variable frequency air conditioner, the compensation is started after the air conditioner is started for a set time.
When the outdoor temperature and/or the compressor frequency change, the reference opening degree of the electronic expansion valve can be adjusted according to the outdoor environment temperature and the compressor frequency, and the electronic expansion valve can be quickly and reasonably adjusted to the most appropriate opening degree. The rationality and the reaction speed of the adjustment of the electronic expansion valve can be improved, the refrigeration effect of the air conditioner is improved, and the refrigeration efficiency of the air conditioner is fully improved.
[ description of the drawings ]
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic diagram of an adjusting process of an electronic expansion valve control method during refrigeration operation of a variable frequency air conditioner in an embodiment of the invention.
Fig. 2 is a flowchart of a method for controlling an electronic expansion valve during the refrigeration operation of the inverter air conditioner according to the embodiment of the invention.
[ detailed description of the invention ]
The reference opening degree of the electronic expansion valve is calculated according to the combination of the outdoor environment temperature and the frequency of the compressor, and when the outdoor temperature or the frequency of the compressor changes, the electronic expansion valve can be adjusted to the most appropriate opening degree in time.
The compensation value of the electronic expansion valve is calculated according to the combination of the current opening degree of the electronic expansion valve and the superheat degree of return air, and the compensation method is more accurate.
1. Calculating a reference opening degree:
the formula I is as follows: reference opening K1 × compressor frequency
K1 is a reference opening coefficient
The reference opening coefficient is divided according to the outdoor environment temperature and the compressor frequency.
According to the outdoor environment temperature, the system is divided into 8 areas: zone A, zone B, zone C, zone D, zone E, and zone F, as shown in Table I.
Each outdoor ambient temperature zone is further divided into 3 coefficients according to the magnitude of the compressor frequency, and there are 24 coefficients in total, as shown in table two.
2. The air conditioner starts to refrigerate, after the compressor runs for a period of time, the electronic expansion valve starts to compensate, and the opening degree of the electronic expansion valve consists of a reference opening degree and a compensation value.
According to the superheat degree of return air, the judgment is carried out once every 60 seconds, and each compensation value is accumulated.
Firstly, calculating the current superheat degree, namely the return air superheat degree Ts is Tsu-Te, and dividing the current superheat degree into three conditions according to the comparison between the superheat degree and a set target range:
A. the degree of superheat is larger than the set upper limit value, the valve opening is increased, and the valve opening is equal to the current opening plus the compensation value.
Compensation value K2 × (V _ ing/(((V _ max-V _ min)/2) + V _ min)) × (Ts-T1)
B. The degree of superheat is between the upper limit and the lower limit, and the valve compensation value is kept unchanged
C. The degree of superheat is less than a set lower limit value, the valve opening degree decreases, and the valve opening degree becomes the current opening degree-compensation value.
Compensation value K2 × (V _ ing/(((V _ max-V _ min)/2) + V _ min)) × (T2-Ts)
Wherein,
k2, the default value of the compensation coefficient is as follows: 8
T1, the default upper limit of the refrigeration superheat degree is as follows: 4
T2, the default value of the lower limit of the refrigeration superheat degree is as follows: 0
And V _ max, the default value of the maximum opening degree of the valve is as follows: 480
V _ min, the default value of the minimum opening degree of the valve work is as follows: 90
Tsu: return air temperature of compressor
Te: evaporator temperature
V _ ing, current opening degree of electronic expansion valve
Table one:
| region(s) | Range of outdoor temperature |
| Zone A | The outdoor temperature is more than or equal to 46 DEG C |
| Zone B | The outdoor temperature is more than or equal to 38 ℃ and less than 46 DEG C |
| Region C | The outdoor temperature is more than or equal to 31 ℃ and less than 38 DEG C |
| Region D | The outdoor temperature is more than or equal to 25 ℃ and less than 31 DEG C |
| Region E | The outdoor temperature is more than or equal to 20 ℃ and less than 25 DEG C |
| Zone F | The outdoor temperature is more than or equal to 10 ℃ and less than 20 DEG C |
| G region | The outdoor temperature is less than 10 DEG C |
Table 2:
example (b): the variable frequency air conditioner is in a starting refrigeration mode, the outdoor temperature is 35 ℃, and the running frequency is 61 HZ; when the compressor is operated for 7 minutes, the return air temperature is 16 ℃, and the evaporation temperature is 10 ℃. When the operation is carried out for 9 minutes, the outdoor temperature is increased from 35 ℃ to 40 ℃, the frequency is increased from 61HZ to 67HZ, the return air temperature is reduced from 16 ℃ to 13 ℃, and the evaporator temperature is kept unchanged at 10 ℃. And (5) running for 10 minutes, keeping the outdoor temperature, the compressor frequency, the return air temperature and the evaporator temperature unchanged.
(variable frequency air conditioner program setting: K2 is 8, superheat degree upper limit is 4, superheat degree lower limit is 0, maximum opening is 480 steps, minimum opening is 90 steps)
(1) The opening degree of the compressor is measured according to the standard within 7 minutes:
the outdoor temperature of 35 ℃ corresponds to the C partition in the table one, the C partition in the table two, and the coefficient K1 at the operating frequency of 58HZ is 4.4:
reference opening K1 × compressor frequency
＝4.4×61
268 step
Calculating to obtain the standard opening of the expansion valve within 7 minutes of starting the compressor as 268 steps;
(2) and 7 minutes after the compressor is started, calculating the compensation value of the electronic expansion valve:
superheat degree of returned air Ts ═ Tsu-Te
＝16–10
＝6
The lower limit value of the set superheat degree is 4, the calculated return air superheat degree is larger than the upper limit value of the set superheat degree, and the valve opening degree needs to be increased
Substituting the data into the formula:
compensation value K2 × (V _ ing/(((V _ max-V _ min)/2) + V _ min)) × (Ts-T1)
＝8×(268/(((480–90)/2)+90))×(6-4)
＝8×(268/(195+90))×2
＝8×0.94×2
15 steps as follows
According to the calculation of the degree of superheat, 15 steps of compensation are started after 7 minutes, and the current opening of the valve is obtained in a way that 268+15 is changed into 283 steps
(3) Since the current opening degree of the valve has changed due to the compensation, the second compensation value at the 8 th minute is:
compensation value K2 × (V _ ing/(((V _ max-V _ min)/2) + V _ min)) × (Ts-T1)
＝8×(283/(((480–90)/2)+90))×(6-4)
＝8×(283/(195+90))×2
＝8×0.993×2
16 steps as follows
According to the calculation of the degree of superheat, the second compensation is 16 steps after the 7 th minute, and the current opening degree of the valve is obtained in steps of 268+ (15+16) to 299
(4) When the compressor runs for 9 minutes, the frequency of the compressor is changed with the outdoor temperature, the frequency of the compressor is increased from 61HZH to 67HZ, the outdoor temperature is increased from 35 ℃ to 40 ℃, and the return air temperature is reduced from 16 ℃ to 13 ℃ (the temperature is increased to 5 ℃ only by the application of the illustrative formula); the reference opening degree of the valve is changed as the compressor frequency is changed. The previous two compensation values are accumulated and are effective all the time. At this time, the reference opening degree needs to be recalculated.
Compressor frequency 67HZ, outdoor temperature 40 ℃ corresponding to zone B, K1: 4.8
Reference opening K1 × compressor frequency
＝4.8×67
322 steps
Superheat degree of returned air Ts ═ Tsu-Te
＝13-10
＝3
The superheat degree of the return air is between the upper limit and the lower limit, and the valve compensation value is kept unchanged.
The compensation values of the step (2) and the step (3) are accumulated to be effective, and the compensation of the step (2) and the step (3) is increased.
Therefore, the current opening of the valve is equal to the reference opening value + the previous accumulated compensation value
＝322+31
353 steps
(5) When the compressor runs for 10 minutes, the outdoor temperature, the compressor frequency, the return air temperature and the evaporator temperature are kept unchanged. The valve opening is kept 353 constant.
Compared with the prior art, the electronic expansion valve control method of the above embodiment of the invention can quickly and reasonably adjust the electronic expansion valve to the most appropriate opening degree when the outdoor temperature changes, the compressor frequency changes or the two changes simultaneously during the refrigeration operation. The rationality and the reaction speed of the adjustment of the electronic expansion valve can be improved, the refrigeration effect of the air conditioner is improved, and the refrigeration efficiency of the air conditioner is fully improved.
Note: the compressor frequency is equal to the compressor rotation speed/60, and the compressor rotation speed is equal to the compressor frequency multiplied by 60; for example, when the compressor frequency is 70HZ, the compressor rotation speed is 70 × 60 to 4200 rpm/min.
Claims (6)
1. A control method of an electronic expansion valve during the refrigeration operation of a variable frequency air conditioner is characterized in that the reference opening degree of the electronic expansion valve is equal to the reference opening degree coefficient multiplied by the frequency of a compressor; the value of the reference opening coefficient is related to the outdoor ambient temperature and the compressor frequency.
2. The control method of the electronic expansion valve during the refrigerating operation of the inverter air conditioner as claimed in claim 1, wherein the outdoor ambient temperature is divided into a plurality of zones according to the temperature; each outdoor environment temperature zone corresponds to a plurality of reference opening coefficients according to the frequency of the compressor.
3. The control method of the electronic expansion valve during the refrigeration running of the variable frequency air conditioner as claimed in claim 1, wherein the opening degree of the electronic expansion valve is composed of a reference opening degree and a compensation value during the running process of the air conditioner; judging the value of the return air superheat degree according to the set interval time, determining a compensation value according to the size of the return air superheat degree, and performing compensation accumulation:
the superheat degree Ts of returned air is Tsu-Te;
wherein,
tsu: the return air temperature of the compressor;
te: evaporator temperature;
1) the return air superheat degree is larger than a set upper limit value, and the valve opening degree is equal to the current opening degree plus a compensation value;
compensation value K2 × (V _ ing/(((V _ max-V _ min)/2) + V _ min)) × (Ts-T1);
2) the degree of superheat of the return air is between the set upper limit and the set lower limit, and the valve opening degree is kept unchanged;
3) the return air superheat degree is smaller than a set lower limit value, and the valve opening degree is equal to the current opening degree-a compensation value;
compensation value K2 × (V _ ing/(((V _ max-V _ min)/2) + V _ min)) × (T2-Ts);
k2 is a set compensation coefficient;
t1, upper limit of refrigeration superheat degree;
t2, lower limit of refrigeration superheat degree;
v _ max is the maximum opening of the valve;
v _ min is the minimum opening degree of the valve;
v _ ing is the current opening degree of the electronic expansion valve.
4. The control method of the electronic expansion valve during the refrigeration running of the variable frequency air conditioner as claimed in claim 3, wherein the default value of the compensation coefficient is 8; the default value of the upper limit of the refrigeration superheat degree is 4; the default value of the lower limit of the refrigeration superheat degree is 0; the default value of the maximum working opening of the valve is 480; the default value for the minimum opening for valve operation is 90.
5. The control method of the electronic expansion valve during the refrigeration operation of the inverter air conditioner as claimed in claim 3, wherein the reference opening value is recalculated when the frequency of the compressor and/or the outdoor temperature changes during the operation of the air conditioner; the opening degree of the electronic expansion valve is an algebraic sum of a recalculated reference opening degree value and a previously accumulated compensation value.
6. The method for controlling the electronic expansion valve during the refrigeration running of the inverter air conditioner as claimed in claim 3, wherein the compensation is started after a set time elapses after the air conditioner is turned on.
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| CN201510055997.5A CN104633862B (en) | 2015-02-03 | 2015-02-03 | The control method of electric expansion valve during a kind of refrigerating of convertible frequency air conditioner operation |
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| CN201510055997.5A CN104633862B (en) | 2015-02-03 | 2015-02-03 | The control method of electric expansion valve during a kind of refrigerating of convertible frequency air conditioner operation |
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| CN105423668A (en) * | 2015-12-09 | 2016-03-23 | 三菱重工海尔(青岛)空调机有限公司 | Control method for electronic expansion valve |
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