CN103712309A - Air-conditioner refrigerant flow control method - Google Patents
Air-conditioner refrigerant flow control method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000003507 refrigerant Substances 0.000 title claims abstract description 32
- 238000004781 supercooling Methods 0.000 claims description 167
- 238000005057 refrigeration Methods 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000007710 freezing Methods 0.000 claims description 4
- 230000008014 freezing Effects 0.000 claims description 4
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- 230000001105 regulatory effect Effects 0.000 abstract description 2
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- 238000009434 installation Methods 0.000 description 3
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- 239000002826 coolant Substances 0.000 description 2
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- 230000008020 evaporation Effects 0.000 description 2
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- 238000002407 reforming Methods 0.000 description 2
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Abstract
The invention discloses an air-conditioner refrigerant flow control method. The air-conditioner uses an electronic expansion valve as a throttling component. The air-conditioner refrigerant flow control method includes the steps of S1, determining a condensate depression delta T according to running modes of the air-conditioner, S2, determining a target condensate depression delta P according to running modes of the air-conditioner and environmental temperature, and S3, obtaining a condensate depression differential value SH according to the difference between the condensate depression delta T and the target condensate depression delta P, and regulating the openness of the electronic expansion valve according to the condensate depression differential value SH. The air-conditioner refrigerant flow control method has the advantages of accurate flow controlling and low cost.
Description
Technical field
The present invention relates to air-conditioning technical field, more particularly, relate to a kind of air conditioner refrigerant flow control method.
Background technology
Along with the development of air-conditioning technical, DC frequency converting air-conditioner reaches its maturity technically, has also obtained user's approval on market, has come into gradually huge numbers of families.According to the large market of air conditioner refrigerating related data, show, in recent years, the occupation rate of market of the convertible frequency air-conditioner of China goes up fast, has broken through 50% now.Convertible frequency air-conditioner has become the development trend of following air-conditioning.The advantage of convertible frequency air-conditioner is to regulate according to system loading the output of frequency-changeable compressor, therefore more energy-efficient.But, the cold medium flux of the exporting change requirement frequency-conversion air-conditioning system of compressor can be according to system loading flexible modulation, convertible frequency air-conditioner generally adopts the cold medium flux of electronic expansion valve controls system at present, and adopt control method for overheat: air-conditioning system is moved a period of time with initial valve step after opening, according to the degree of superheat of air-conditioning and valve step value, determine adjustment direction and the adjustment amount of electric expansion valve, thereby make air-conditioning reach optimal operational condition.Its main drawback is as follows:
(1) start starting stage system is in higher load condition, and in the short time, the air-conditioning system degree of superheat not yet forms, and the super heat value now detecting can not represent true superheat state, if adjust by this, easily makes the whole opposite direction of valve step, causes endless loop.
(2) air-conditioning is commonly used negative tempperature coefficient thermistor sensor at present, it has, and volume is little, highly sensitive, reaction speed fast, resolution ratio advantages of higher, but its linearity is low, poor stability, make temperature test have certain error, and degree of superheat control range is narrower, thereby the error of sensor is larger to degree of superheat control effect, system running state and optimum state have very large deviation.
(3) degree of superheat is controlled highly to the accuracy of detection degree of dependence of sensor, and the installation site difference of sensor or because refrigrant leakage appears in the error of later period maintenance installation of sensors and air-conditioning, will make system lose accurate control.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of and adopt degree of supercooling control method, control air conditioner refrigerant flow control method accurately, to overcome the deficiencies in the prior art.
The technical solution adopted in the present invention is: a kind of air conditioner refrigerant flow control method, described air-conditioner adopts electric expansion valve as throttle part, and described air conditioner refrigerant flow control method comprises the following steps: S1) according to the operational mode of air-conditioner, determine degree of supercooling △ T; S2) according to the operational mode of air-conditioner and environment temperature, determine target degree of supercooling △ P; S3) difference by degree of supercooling △ T and target degree of supercooling △ P obtains degree of supercooling difference SH, then according to degree of supercooling difference SH, regulates the aperture of electric expansion valve.
Preferably, the described operational mode according to air-conditioner determines that degree of supercooling △ T comprises: the operational mode of judgement air-conditioner, if refrigerating operaton degree of supercooling △ T equals the poor of compressor exhaust temperature Tp and outdoor unit heat exchanger outlet temperature T3, if heating operation degree of supercooling △ T equal the poor of compressor exhaust temperature Tp and indoor set heat exchanger temperature T 2.
Preferably, describedly according to the operational mode of air-conditioner and environment temperature, determine that target degree of supercooling △ P comprises: S21) obtain environment temperature; S22) if air-conditioner is refrigerating operaton, according to described environment temperature, by the corresponding relation of environment temperature under refrigerating state and target degree of supercooling, determine target degree of supercooling △ P, if air-conditioner is heating operation, according to described environment temperature, by heating the corresponding relation of environment temperature and target degree of supercooling under state, determine target degree of supercooling △ P.
Preferably, under described refrigerating state, environment temperature is used for according to target degree of supercooling △ P corresponding under environment temperature inquiry refrigerating state with the corresponding relation of target degree of supercooling, the described corresponding relation that heats environment temperature and target degree of supercooling under state is for according to environment temperature, inquiry heats the target degree of supercooling △ P that state is corresponding, under described refrigerating state the corresponding relation of environment temperature and target degree of supercooling with described in heat the corresponding relation of environment temperature and target degree of supercooling under state data in advance be arranged in air-conditioner system.
Preferably, described environment temperature refers to outdoor environment temperature.
Preferably, the described aperture according to degree of supercooling difference SH adjusting electric expansion valve comprises: if S31) degree of supercooling difference SH is greater than the first preset temperature Tm, the aperture of electric expansion valve is tuned up to a first regulation value; If degree of supercooling difference SH is less than the second preset temperature Tn, turn the aperture of electric expansion valve down a second regulation value; If degree of supercooling difference SH is between the first preset temperature Tm and the second preset temperature Tn, Tm≤SH≤Tn, keeps the aperture of electric expansion valve constant; Wherein the first preset temperature Tm is greater than the second preset temperature Tn; S32) return to step S1.
Preferably, the described aperture by electric expansion valve tunes up a first regulation value and further comprises: if the aperture of described electric expansion valve has been adjusted to maximum opening, maintain maximum opening, no longer tune up; If the aperture of described electric expansion valve has been adjusted to minimum aperture and has maintained minimum aperture, no longer turn down.
Preferably, describedly according to degree of supercooling difference SH, regulate the aperture of electric expansion valve to comprise: if S311) SH>3 ℃, the aperture of electric expansion valve tunes up 8P; If-3 ℃≤SH≤3 ℃, electric expansion valve keeps aperture constant; If SH<-3 ℃, the aperture of electric expansion valve turns down 8P; And if the aperture of described electric expansion valve has been adjusted to maximum opening and maintains maximum opening, no longer tune up; If the aperture of described electric expansion valve has been adjusted to minimum aperture and has maintained minimum aperture, no longer turn down; Wherein, P is aperture unit pulse; S321) return to step S1.
A kind of air conditioner refrigerant flow control method, described air-conditioner adopts electric expansion valve as throttle part, and described air conditioner refrigerant flow control method comprises the following steps: S10) obtain compressor exhaust temperature Tp, outdoor unit heat exchanger outlet temperature T3 and environment temperature; S20) according to the corresponding relation of environment temperature under refrigerating state and target degree of supercooling, determine target degree of supercooling △ P; S30) by the difference of compressor exhaust temperature Tp, outdoor unit heat exchanger outlet temperature T3 and target degree of supercooling △ P obtain freezing degree of supercooling difference SH1, i.e. SH1=Tp-T3-△ P; S40) if refrigeration degree of supercooling difference SH1 is greater than the first preset temperature Tm, the aperture of electric expansion valve is tuned up to a first regulation value; If refrigeration degree of supercooling difference SH1 is less than the second preset temperature Tn, turn the aperture of electric expansion valve down a second regulation value; If SH1 is between the first preset temperature Tm and the second preset temperature Tn for refrigeration degree of supercooling difference, Tm≤SH1≤Tn, keeps the aperture of electric expansion valve constant; S50) return to step S10.
Preferably, described environment temperature refers to outdoor environment temperature Th, and under described refrigerating state, the corresponding relation of environment temperature and target degree of supercooling meets following table:
Before step S10, also comprise that the data that the corresponding relation of environment temperature under described refrigerating state and target degree of supercooling is related to are arranged on the step in air-conditioner system.
Preferably, the first preset temperature Tm equals 3 ℃, and the second preset temperature Tn equals-3 ℃, and the first regulation value equals 8P, and the second regulation value equals 8P, and wherein P is aperture unit pulse.
The invention has the beneficial effects as follows:
1, the present invention adopts according to the control method of system degree of supercooling adjustment System cold medium flux, can overcome in air-conditioning start-up phase, adopts traditional control method for overheat easily to occur the technical problem of endless loop.
2, because degree of supercooling control interval scope is larger, thereby make the measure error of sensor less on the impact of control method, make to control more accurately reliable.
3, the sensor differences of volume production is little on air-conditioning degree of supercooling detection impact, the degree of superheat is detected to impact large, and the present invention adopts the control method of degree of supercooling adjustment System cold medium flux, can overcome the impact of the sensor differences of volume production.
4, the air-conditioning of employing control method of the present invention can save the return-air sensor of compressor, provides cost savings, and makes electric-control system operation more reliable simultaneously.
Accompanying drawing explanation
Fig. 1 is the refrigerant system configurations schematic diagram of convertible frequency air-conditioner of the present invention.
The specific embodiment
The inventive method is a kind of according to the relation of the compressor exhaust temperature Tp of multi-connected machine central air-conditioning, outdoor unit heat exchanger outlet temperature T3, indoor set heat exchanger temperature T 2, with certain rule, thereby the electronic expansion valve opening of control system is implemented the control method that system cold medium flux is adjusted.
As shown in Figure 1, take transducer air conditioning as example, transducer air conditioning refrigeration system of the present invention comprises compressor 10, cross valve 8, outdoor unit heat exchanger 1, electric expansion valve 3, the indoor set heat exchanger 6 being connected.Electric expansion valve 3 is throttle parts of refrigeration system, at electric expansion valve 3 and 6 of indoor set heat exchangers, be provided with the first two-way stop valve 4, at indoor set heat exchanger 6 and 8 of cross valves, be provided with the second two-way stop valve 7, on outdoor unit heat exchanger 1, radiator fan is installed, a side ports at outdoor unit heat exchanger 1 is provided with outer machine sensor 2, and for detection of outdoor unit heat exchanger temperature value, this side ports is connected with electric expansion valve 3, under refrigerating state, this side ports is condensator outlet end.At the middle part of indoor set heat exchanger 6 coil pipe, be provided with interior machine sensor 5, for detection of indoor set heat exchanger temperature value.Exhaust side at compressor 10 arranges compressor air-discharging sensor 9, for detection of compressor exhaust temperature value.
As shown in Figure 1, under refrigeration mode, refrigerant circulation flow process is as follows: the refrigerant steam that compressor 10 is HTHP by the refrigerant both vapor compression of the high-temperature low-pressure from indoor set heat exchanger 6, through cross valve 8 to release heat in outdoor unit heat exchanger 1, be condensed into highly pressurised liquid, by electric expansion valve 3 step-downs, be low-temp low-pressure liquid again, enter indoor set heat exchanger 6 evaporation endothermics, low temperature liquid refrigerant is vaporizated into the steam of high-temperature low-pressure in the interior heat absorption of indoor set heat exchanger 6, after cross valve 8 enters low-pressure liquid storing tank 11, again enter compressor 10.
Under heating mode, cross valve 8 changes paths, makes refrigerant contrary when freezing at the flow direction of outdoor unit heat exchanger 1 and indoor set heat exchanger 6, realizes heat-production functions.
In the present invention, according to the variation of system degree of supercooling, adjust the aperture of electric expansion valve 3 in good time, make the flow of refrigerant in system reach suitable level.Its method is mainly as follows:
S1) according to the operational mode of air-conditioner, determine degree of supercooling △ T;
S2) according to the operational mode of air-conditioner and environment temperature, determine target degree of supercooling △ P;
S3) difference by degree of supercooling △ T and target degree of supercooling △ P obtains degree of supercooling difference SH, then according to degree of supercooling difference SH, regulates the aperture of electric expansion valve.
If air-conditioner is refrigerating operaton, according to the corresponding relation of environment temperature under refrigerating state and target degree of supercooling, determine target degree of supercooling △ P, if air-conditioner is heating operation, according to heating the corresponding relation of environment temperature and target degree of supercooling under state, determine target degree of supercooling △ P.Wherein, under refrigerating state, environment temperature is used for according to target degree of supercooling △ P corresponding under environment temperature inquiry refrigerating state with the corresponding relation of target degree of supercooling, heat the corresponding relation of environment temperature and target degree of supercooling under state for inquiry heats the target degree of supercooling △ P that state is corresponding according to environment temperature, and under refrigerating state the corresponding relation of environment temperature and target degree of supercooling with described in heat the corresponding relation of environment temperature and target degree of supercooling under state data in advance be arranged in air-conditioner system.
In the present invention, air-conditioning refrigeration system degree of supercooling △ T is the difference of compressor exhaust temperature Tp and system condensing temperature, and according to the difference of mode of operation, air-conditioning refrigeration system degree of supercooling △ T is divided into refrigerating state degree of supercooling △ T
refrigerationwith heat state degree of supercooling △ T
heat, computing formula is as follows:
Refrigerating state: △ T
refrigeration=Tp-T3;
Heat state: △ T
heat=Tp-T2.
Wherein, Tp is compressor exhaust temperature, the real time temperature value that compressor air-discharging sensor 9 detects;
T3 is outdoor unit heat exchanger outlet temperature, and the real time temperature value detecting at the set outer machine sensor 2 of a side ports (condensator outlet end) of outdoor unit heat exchanger 1 is used to indicate the outlet temperature of outdoor unit heat exchanger under refrigerating state;
T2 is indoor set heat exchanger temperature, and the real time temperature value that set interior machine sensor 5 detects in coil pipe position, the middle part of indoor set heat exchanger 6, is used to indicate in the temperature that heats indoor set heat exchanger under state.
After air-conditioning has assembled, the cooling medium charging amount of its refrigeration system is fixed, and the area of off-premises station, indoor set heat exchanger is also what to be fixed up, and the operating condition of air-conditioning (environment temperature) changes, thereby correspondingly, the cold medium flux of system, degree of supercooling also should be adjusted adaptively, so that under different operating conditions, system all can keep high operating efficiency.We calculate through a large amount of practice and theories, formulated the target degree of supercooling of air-conditioning system at following varying environment temperature, as the refrigerating state target degree of supercooling table of comparisons of table 1 and heating as shown in the status target degree of supercooling table of comparisons of table 2 below, and corresponding data are built in refrigerating of convertible frequency air conditioner system of the present invention.Should be understood to, when environment temperature is in affiliated temperature range, if when system degree of supercooling reaches affiliated desired value, its operational efficiency is preferably, thereby we need the degree of supercooling of control system to reach desired value, in other words, in the certain limit up and down of desired value, float.This scope should be dwindled as far as possible, but also consider to control cost simultaneously, the operation stability of system.Below, in list mode, be illustrated in refrigeration and heat under state the target degree of supercooling in each environment temperature interval:
The table 1 refrigerating state target degree of supercooling table of comparisons
| Environment temperature Th(℃) | Target degree of supercooling △ P(℃) |
| ≤15 | 12 |
| 15＜Th≤20 | 16 |
| 20＜Th≤25 | 20 |
| 25＜Th≤30 | 24 |
| 30＜Th≤35 | 28 |
| 35＜Th≤40 | 32 |
| ≥45℃ | 36 |
Table 2 heats the status target degree of supercooling table of comparisons
| Environment temperature (℃) | Target degree of supercooling △ P(℃) |
| ≥20 | 36 |
| 15≤Th＜20 | 32 |
| 10≤Th＜15 | 28 |
| 5≤Th＜10 | 24 |
| 0≤Th＜5 | 20 |
| -5≤Th＜0 | 16 |
| ＜-5℃ | 12 |
For air-conditioning, the condensing state of cold-producing medium can embody by the difference of compressor exhaust temperature and condensation temperature, under cooling condition lower outside machine condensator outlet temperature and heating condition, indoor machine evaporation middle part temperature all embodies the condensing state of system, condenser temperature or degree of supercooling are also very representational reference quantities in system, system capability is had to conclusive impact, its difference range is wider, generally, in 10K～40K left and right, can pass through to control the in good shape ground control system running status of condensation.Degree of supercooling desired value of the present invention is determined according to outdoor environment temperature interval division.
Control system is according to the difference of actual degree of supercooling and target degree of supercooling, and output automatically controlled signal is controlled coil of electronic expansion valve driver's valve body action, thereby tunes up or reduce the aperture of electric expansion valve 3, and final realization makes system cold medium flux be adjusted to the object of appropriate amount.Degree of supercooling difference SH regulates the method for electronic expansion valve opening to be:
If degree of supercooling difference SH is greater than the first preset temperature Tm, the aperture of electric expansion valve is tuned up to a first regulation value; If degree of supercooling difference SH is less than the second preset temperature Tn, turn the aperture of electric expansion valve down a second regulation value; If degree of supercooling difference SH is between the first preset temperature Tm and the second preset temperature Tn, Tm≤SH≤Tn, keeps the aperture of electric expansion valve constant.Wherein the first preset temperature Tm is greater than the second preset temperature Tn.Preferred the first regulation value, the second regulation value value 8P, preferably degree of supercooling difference SH scope is-3 ℃≤SH≤3 ℃.
Below, describe the control method of heating and air conditioner coolant quantity in detail, wherein, the degree of supercooling difference SH under definition refrigerating state is refrigeration degree of supercooling difference SH1, and the degree of supercooling difference SH heating under state heats degree of supercooling difference SH2:
Under refrigeration mode:
After air-conditioning start, electric expansion valve 3 is opened to initial opening, by controlling the regulation cold medium flux of electric expansion valve 3, concrete grammar is as follows: system boot operation is after 3 minutes, testing environment temperature, compressor exhaust temperature Tp and outdoor unit heat exchanger outlet temperature T3, by the refrigerating state target degree of supercooling table of comparisons, read the target degree of supercooling △ P value of environment temperature place temperature range, system-computed degree of supercooling △ T
refrigerationwith the refrigeration degree of supercooling difference SH1 of target degree of supercooling △ P, i.e. SH1=△ T
refrigeration-△ P=Tp-T3-△ P, then regulates electric expansion valve 3 according to SH1:
If SH1>3 ℃, the aperture of electric expansion valve 3 tunes up 8P;
If-3 ℃≤SH1≤3 ℃, electric expansion valve 3 keeps aperture constant;
If SH1<-3 ℃, the aperture of electric expansion valve 3 turns down 8P;
In the present embodiment, system judgement in every 40 seconds regulates once, from new detection outdoor environment temperature, compressor exhaust temperature Tp and outdoor unit heat exchanger outlet temperature T3, obtain △ P and calculate SH1, according to SH1, regulate the aperture of electric expansion valve 3, when the above-mentioned aperture to electric expansion valve 3 regulates, if desired turn down the aperture of electric expansion valve 3, and having reached minimum aperture, the aperture of electric expansion valve 3 just no longer turns down; If desired tune up the aperture of electric expansion valve 3, and the aperture of electric expansion valve 3 has reached stool and has no longer opened large.
Above-mentioned environment temperature refers to outdoor environment temperature, and outdoor atmospheric temperature, is used for target setting degree of supercooling △ P to carry out follow-up electronic expansion valve opening adjusting.In other embodiments, for easy for installation, this environment temperature also can directly adopt corresponding indoor environment temperature, certainly in this case, the refrigerating state target degree of supercooling table of comparisons and heat the status target degree of supercooling table of comparisons and conventionally need to adjust, its concrete numerical value can calculate formulation with reference to the mode of table 1 and table 2 by practice and theory by research staff, does not repeat them here.
In this control method, using ± 3 ℃ of degree of supercooling interval values of controlling as aperture, set up A, B, (A is degree of supercooling >3 ℃ in C tri-degree of supercooling intervals, B is-3 ℃≤degree of supercooling≤3 ℃, C is degree of supercooling <-3 ℃) be proper, it is too large that interval value is set, and regulates insensitively, and system is difficult to be adjusted to optimum state; This interval value is too little, regulates too sensitivity, and system there will be unsettled reforming phenomena and is difficult to stablize.
When degree of supercooling difference is in interval A, be SH1>3 ℃, illustrate that actual degree of supercooling is greater than target degree of supercooling, the actual degree of supercooling of system is bigger than normal, and now electric expansion valve 3 is opened large 8P, it is large that cold medium flux becomes, can make system degree of supercooling diminish, after 40S, judge again, Ruo Hai A district, electric expansion valve 3 continues out large 8P ,-3 ℃≤SH1≤3 ℃ until system degree of supercooling satisfies condition.
When degree of supercooling difference is in interval B ,-3 ℃≤SH1≤3 ℃, illustrate that actual degree of supercooling approaches target degree of supercooling, meet and control requirement, electric expansion valve 3 does not regulate.
When degree of supercooling difference is in interval C, be SH1<-3 ℃, illustrate that actual degree of supercooling is less than target degree of supercooling, the actual degree of supercooling of system is less than normal, now allows electric expansion valve 3 turn down 8P, cold medium flux diminishes, can affect system degree of supercooling and become large, after 40S, judge again, if degree of supercooling difference is also interval at C, continue to turn down 8P, until system degree of supercooling difference is in interval B.
The present invention has stipulated after 3 minutes, just to start to detect degree of supercooling in system operation, is when start regulates, easily to occur system reforming phenomena, and after system startup moves 3 minutes, system operational parameters tends towards stability, and now adjusts valve more reasonable.
During heating mode, electric expansion valve 3 regulates the method step of cold medium flux as follows:
System operation is after 3 minutes, testing environment temperature, compressor exhaust temperature Tp, indoor set heat exchanger real time temperature value T2, by heating the status target degree of supercooling table of comparisons, read the target degree of supercooling △ P value (environment temperature is herein outdoor environment temperature) of environment temperature place temperature range, what control system was calculated actual degree of supercooling △ T and target degree of supercooling △ P heats degree of supercooling difference SH2, i.e. SH2=△ T
heat-△ P=Tp-T2-△ P, regulates electric expansion valve 3 according to SH2:
If SH2>3 ℃, machine PMV in electric expansion valve 3() open large 8P;
If-3 ℃≤SH2≤3 ℃, electric expansion valve 3 keeps aperture constant;
If SH2<-3 ℃, electric expansion valve 3 turns down 8P;
In the present embodiment, system judgement in every 40 seconds regulates once, and regulating the target of electric expansion valve 3 is to make the degree of supercooling difference SH2 that heats of degree of supercooling △ T and target degree of supercooling △ P maintain-3 ℃≤SH2≤3 ℃, realizes cold medium flux and controls.But, if just the aperture of electric expansion valve 3 has reached minimum aperture no longer turns down, if aperture has reached stool, no longer open large.
Because air-conditioner exists the difference in mode of operation, therefore, thereby for heating and air conditioner, can arrange above-mentioned for refrigeration work pattern with heat under mode of operation according to the variation of system degree of supercooling and adjust the method that electronic expansion valve opening regulates cold medium flux in good time simultaneously, now need to before calculating degree of supercooling △ T, increase the step of a judgement air-conditioner system operational mode, if judgment result is that, refrigeration mode adopts the cold medium flux control method under refrigeration mode, if judgment result is that, heating mode adopts the cold medium flux control method of heating mode.For single cold type air-conditioner, can the cold medium flux control method for refrigeration work pattern be only set, method is as follows:
First obtain compressor exhaust temperature Tp, outdoor unit heat exchanger outlet temperature T3 and environment temperature; According to the corresponding relation of environment temperature under refrigerating state and target degree of supercooling, determine target degree of supercooling △ P again; Then by the difference of compressor exhaust temperature Tp, outdoor unit heat exchanger outlet temperature T3 and target degree of supercooling △ P obtain freezing degree of supercooling difference SH1, i.e. SH1=Tp-T3-△ P; If it is 3 ℃ that refrigeration degree of supercooling difference SH1 is greater than the first preset temperature Tm(optimal value), the aperture of electric expansion valve is tuned up to a first regulation value (optimal value is 8P); If refrigeration degree of supercooling difference SH1 is less than the second preset temperature Tn(optimal value for-3 ℃), turn the aperture of electric expansion valve down a second regulation value (optimal value is 8P); If SH1 is between the first preset temperature Tm and the second preset temperature Tn for refrigeration degree of supercooling difference, Tm≤SH1≤Tn, keeps the aperture of electric expansion valve constant.
The corresponding relation of environment temperature and target degree of supercooling is: when environment temperature be respectively≤15 ℃, 15～20 ℃, 20～15 ℃, 25～30 ℃, 30～35 ℃, 35～40 ℃ and >=45 ℃ time, correspondingly, corresponding target degree of supercooling △ P is respectively 12 ℃, 16 ℃, 20 ℃, 24 ℃, 28 ℃, 32 ℃ and 36 ℃.
Claims (11)
1. an air conditioner refrigerant flow control method, described air-conditioner adopts electric expansion valve as throttle part, it is characterized in that, and described air conditioner refrigerant flow control method comprises the following steps:
S1) according to the operational mode of air-conditioner, determine degree of supercooling △ T;
S2) according to the operational mode of air-conditioner and environment temperature, determine target degree of supercooling △ P;
S3) difference by degree of supercooling △ T and target degree of supercooling △ P obtains degree of supercooling difference SH, then according to degree of supercooling difference SH, regulates the aperture of electric expansion valve.
2. air conditioner refrigerant flow control method according to claim 1, is characterized in that: the described operational mode according to air-conditioner determines that degree of supercooling △ T comprises:
The operational mode of judgement air-conditioner, if refrigerating operaton degree of supercooling △ T equals the poor of compressor exhaust temperature Tp and outdoor unit heat exchanger outlet temperature T3, if heating operation degree of supercooling △ T equal the poor of compressor exhaust temperature Tp and indoor set heat exchanger temperature T 2.
3. air conditioner refrigerant flow control method according to claim 2, is characterized in that: describedly according to the operational mode of air-conditioner and environment temperature, determine that target degree of supercooling △ P comprises:
S21) obtain environment temperature;
S22) if air-conditioner is refrigerating operaton, according to described environment temperature, by the corresponding relation of environment temperature under refrigerating state and target degree of supercooling, determine target degree of supercooling △ P, if air-conditioner is heating operation, according to described environment temperature, by heating the corresponding relation of environment temperature and target degree of supercooling under state, determine target degree of supercooling △ P.
4. air conditioner refrigerant flow control method according to claim 3, it is characterized in that: under described refrigerating state, environment temperature is used for according to target degree of supercooling △ P corresponding under environment temperature inquiry refrigerating state with the corresponding relation of target degree of supercooling, the described corresponding relation that heats environment temperature and target degree of supercooling under state is for according to environment temperature, inquiry heats the target degree of supercooling △ P that state is corresponding, under described refrigerating state the corresponding relation of environment temperature and target degree of supercooling and described in heat the corresponding relation of environment temperature and target degree of supercooling under state data in advance be arranged in air-conditioner system.
5. air conditioner refrigerant flow control method according to claim 3, is characterized in that: described environment temperature refers to outdoor environment temperature.
6. air conditioner refrigerant flow control method according to claim 2, is characterized in that: describedly according to degree of supercooling difference SH, regulate the aperture of electric expansion valve to comprise:
S31), if degree of supercooling difference SH is greater than the first preset temperature Tm, the aperture of electric expansion valve is tuned up to a first regulation value; If degree of supercooling difference SH is less than the second preset temperature Tn, turn the aperture of electric expansion valve down a second regulation value; If degree of supercooling difference SH is between the first preset temperature Tm and the second preset temperature Tn, Tm≤SH≤Tn, keeps the aperture of electric expansion valve constant; Wherein the first preset temperature Tm is greater than the second preset temperature Tn;
S32) return to step S1.
7. air conditioner refrigerant flow control method according to claim 6, it is characterized in that: the described aperture by electric expansion valve tunes up a first regulation value and further comprises: if the aperture of described electric expansion valve has been adjusted to maximum opening, maintain maximum opening, no longer tune up; If the aperture of described electric expansion valve has been adjusted to minimum aperture and has maintained minimum aperture, no longer turn down.
8. air conditioner refrigerant flow control method according to claim 2, is characterized in that: describedly according to degree of supercooling difference SH, regulate the aperture of electric expansion valve to comprise:
S311) if SH>3 ℃, the aperture of electric expansion valve tunes up 8P; If-3 ℃≤SH≤3 ℃, electric expansion valve keeps aperture constant; If SH<-3 ℃, the aperture of electric expansion valve turns down 8P; And if the aperture of described electric expansion valve has been adjusted to maximum opening and maintains maximum opening, no longer tune up; If the aperture of described electric expansion valve has been adjusted to minimum aperture and has maintained minimum aperture, no longer turn down; Wherein, P is aperture unit pulse;
S321) return to step S1.
9. an air conditioner refrigerant flow control method, described air-conditioner adopts electric expansion valve as throttle part, it is characterized in that, and described air conditioner refrigerant flow control method comprises the following steps:
S10) obtain compressor exhaust temperature Tp, outdoor unit heat exchanger outlet temperature T3 and environment temperature;
S20) according to the corresponding relation of environment temperature under refrigerating state and target degree of supercooling, determine target degree of supercooling
△P；
S30) by the difference of compressor exhaust temperature Tp, outdoor unit heat exchanger outlet temperature T3 and target degree of supercooling △ P obtain freezing degree of supercooling difference SH1, i.e. SH1=Tp-T3-△ P;
S40) if refrigeration degree of supercooling difference SH1 is greater than the first preset temperature Tm, the aperture of electric expansion valve is tuned up to a first regulation value; If refrigeration degree of supercooling difference SH1 is less than the second preset temperature Tn, turn the aperture of electric expansion valve down a second regulation value; If SH1 is between the first preset temperature Tm and the second preset temperature Tn for refrigeration degree of supercooling difference, Tm≤SH1≤Tn, keeps the aperture of electric expansion valve constant;
S50) return to step S10.
10. air conditioner refrigerant flow control method according to claim 9, is characterized in that: described environment temperature refers to outdoor environment temperature Th, and under described refrigerating state, the corresponding relation of environment temperature and target degree of supercooling △ P meets following table:
Before step S10, also comprise that the data that the corresponding relation of environment temperature under described refrigerating state and target degree of supercooling is related to are arranged on the step in air-conditioner system.
11. air conditioner refrigerant flow control methods according to claim 9, it is characterized in that: the first preset temperature Tm equals 3 ℃, the second preset temperature Tn equals-3 ℃, and the first regulation value equals 8P, the second regulation value equals 8P, and wherein P is aperture unit pulse.
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