CN106594966B - Method for detecting refrigerant leakage of air conditioning system and air conditioning system - Google Patents
Method for detecting refrigerant leakage of air conditioning system and air conditioning system Download PDFInfo
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- CN106594966B CN106594966B CN201610984007.0A CN201610984007A CN106594966B CN 106594966 B CN106594966 B CN 106594966B CN 201610984007 A CN201610984007 A CN 201610984007A CN 106594966 B CN106594966 B CN 106594966B
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- 238000004378 air conditioning Methods 0.000 title abstract description 82
- 239000003507 refrigerant Substances 0.000 title abstract description 37
- 238000000034 method Methods 0.000 title abstract description 36
- 238000001514 detection method Methods 0.000 abstract description 17
- 230000008569 process Effects 0.000 abstract description 10
- 238000009434 installation Methods 0.000 abstract description 8
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000002826 coolant Substances 0.000 description 29
- 238000013480 data collection Methods 0.000 description 19
- 230000007423 decrease Effects 0.000 description 11
- 238000012360 testing method Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000012217 deletion Methods 0.000 description 2
- 230000037430 deletion Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
- 238000012795 verification Methods 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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
-
- 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
- F24F11/62—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
- F24F2110/00—Control inputs relating to air properties
-
- 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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
-
- 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)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a method for detecting refrigerant leakage of an air conditioning system, which comprises the following steps: s10, in the running process of the air conditioning system, when the external environment temperature is T, acquiring the state parameters of the air conditioning system, and storing the data acquired for the first time at the temperature as reference data; s20, in the running process of the air conditioning system, when the external environment temperature reaches T again, acquiring the state parameters of the air conditioning system again; s30, comparing the data collected again with the reference data, and calculating the deviation between the data and the reference data; and S40, judging that the refrigerant leaks when the deviation exceeds a preset value. When the method is adopted to detect the refrigerant leakage, the detection result is not influenced by the actual installation condition, and the influence of the environmental temperature can be eliminated, so that the degree of refrigerant loss in the air conditioning system can be accurately judged, and the detection result is more reliable. The invention also discloses an air conditioning system.
Description
Technical field
The present invention relates to air-conditioning technical fields, and in particular to a method of detection air-conditioning system coolant leakage.The present invention
Further relate to a kind of air-conditioning system.
Background technique
For air-conditioning system, the amount of refrigerant should keep sufficient, if refrigerant missing, will lead to air-conditioning system
Ability (refrigeration or heating) decline of system, influences the usage experience of user.In the prior art, existing a variety of for detecting refrigerant
The method of leakage.Current refrigerant mass flow is obtained for example, having, and according to current refrigerant mass flow and standard refrigerant quality stream
The comparison result of amount judges what whether refrigerant leaked；There is a current refrigerant pressure value of detection, and judge refrigerant with preset pressure value
Whether leakage；Also there is the actual motion power under detection air-conditioning system current operating conditions, obtain the air conditioner described
Theoretical operating rate under current operating conditions, and whether revealed based on data judging.
However, the above-mentioned prior art is all that some value that will currently survey is compared with preset value, and preset value is general
Matching confirms before factory.In these detection methods, practical installation situation and environment temperature are not accounted for
Situation.For example, connection length of tube used when practical installation may be multifarious, and connect that length of tube is different to will affect unit
Parameter causes testing result inaccurate so there are deviations for above-mentioned preset value and actual conditions.Equally, if actually detected
When cannot be guaranteed environment temperature locating for air-conditioning with determine the preset value when corresponding environment temperature it is consistent if, also will affect inspection
Survey the accuracy of result.
Summary of the invention
Based on above-mentioned status, the main purpose of the present invention is to provide a kind of method for detecting air-conditioning system coolant leakage and
Air-conditioning system can accurately detect the deletion condition of air-conditioning system refrigerant using this method, and testing result will not be by practical dress
The influence of machine situation and environment temperature.
To achieve the above object, The technical solution adopted by the invention is as follows:
A method of detection air-conditioning system coolant leakage comprising step:
S10, in air-conditioning system operational process, ambient temperature be T when, acquire the state parameter of air-conditioning system,
And it will collected data be stored as reference data for the first time at this temperature；
S20, in air-conditioning system operational process, when ambient temperature reaches T again, acquire air-conditioning system again
State parameter；
S30, it collected data will be compared again with the reference data, and calculate deviation between the two；
S40, when the deviation be more than preset value when, be judged as coolant leakage.
Preferably, the state parameter of the air-conditioning system includes compressor frequency, pressure at expulsion, pressure of inspiration(Pi), exhaust temperature
Degree, electronic expansion valve opening, indoor heat exchanger enter the pipe degree of superheat, the indoor heat exchanger outlet pipe degree of superheat, and/or air conditioning capacity rate.
Preferably, when compressor frequency decrease beyond preset value, pressure at expulsion decrease beyond preset value, drop of suction pressure
Preset value is increased beyond more than preset value, delivery temperature, electronic expansion valve opening is increased beyond preset value, indoor heat exchanger enters pipe
The degree of superheat decrease beyond preset value, the indoor heat exchanger outlet pipe degree of superheat is increased beyond preset value, and/or the decline of air conditioning capacity rate is super
When crossing preset value, it is judged as coolant leakage.
Preferably, it before step S10, further comprises the steps of:
S00, selected ambient temperature T, and be T by ambient temperature at the time of, is set as data collection point.
Preferably, in step S00, multiple and different data collection points is set, corresponds respectively to different external environment temperature
Spend Ti。
Preferably, in step S00, the ambient temperature range in air-conditioning system location is collected first, in the environment temperature
A data collection point is specified in range every k DEG C, k is scheduled temperature interval.
Preferably, in step S00, internet is accessed by the communication module of air-conditioning system and collects air-conditioning system location
Ambient temperature range, alternatively, the ambient temperature range in air-conditioning system location is collected by way of being manually entered, alternatively, empty
The ambient temperature range in one or more areas is stored in advance in adjusting system before factory.
Preferably, in step S10, the rate of load condensate of air-conditioning system when record acquires the state parameter of air-conditioning system for the first time；Step
It is only identical as the rate of load condensate in step S10 in the rate of load condensate of air-conditioning system when ambient temperature reaches T again in rapid S20
When, the state parameter of air-conditioning system is acquired again.
Preferably, in step S40, the preset value is that refrigerant missing amount reaches corresponding when 30%-35% in air-conditioning system
State parameter and reference data between deviation.
A kind of air-conditioning system, uses whether mentioned-above method detection refrigerant leaks.
The method of detection air-conditioning system coolant leakage provided by the invention, by by the state parameter currently surveyed and before this
The reference data under equal conditions surveyed after booting operation compares, and judges whether to send out by the variable quantity for the data surveyed
Raw coolant leakage, testing result is not influenced by practical installation condition, and can eliminate the influence of environment temperature, it is thus possible to quasi-
Really determine that the degree that refrigerant lacks in air-conditioning system, testing result are more reliable.
Detailed description of the invention
Hereinafter reference will be made to the drawings to it is according to the present invention detection air-conditioning system coolant leakage method and air-conditioning system it is excellent
Embodiment is selected to be described.In figure:
Fig. 1 is a kind of process of the method for the detection air-conditioning system coolant leakage of preferred embodiment according to the present invention
Figure；
Fig. 2 is the process of the method for the detection air-conditioning system coolant leakage of another preferred embodiment according to the present invention
Figure.
Specific embodiment
Whether coolant leakage occurs in use in order to accurately detect air-conditioning system, the present invention provides one
Kind detection air-conditioning system coolant leakage method, as shown in Figure 1, itself comprising steps of
S10, in air-conditioning system operational process, ambient temperature be T when, acquire the state parameter of air-conditioning system,
And it will collected data be stored as reference data for the first time at this temperature；
S20, in air-conditioning system operational process, when ambient temperature reaches T again, acquire air-conditioning system again
State parameter；
S30, it collected data will be compared again with the reference data, and calculate deviation between the two；
S40, when the deviation be more than preset value when, be judged as coolant leakage.
That is, in method of the invention, the main foundation of judgement be not some value for currently surveying compared to before factory really
Fixed preset value has occurred great variation, but by the value currently surveyed under equal conditions survey after booting operation before this
Reference data compare, and by survey value variable quantity judge whether occur coolant leakage.
For example, after completing installation, or after the coolant adding due to reasons such as maintenance or telephone-moving, it can be in subsequent head
Secondary booting and the stable rear operation for carrying out step S10, and obtain reference data.Therefore, in method of the invention, Mei Yitai
The reference data for judging whether leakage refrigerant of air-conditioning system all respectively independently obtains, and uses when will not be installed
Connect the influence of the factors such as length of tube.
During subsequent acquisition data, also it is easy to guarantee every time environment item locating for air-conditioning system when acquisition data
Part is consistent with environmental condition when obtaining reference data, as long as recording ambient temperature T when acquiring data for the first time, and really
Protecting subsequent each execution step S20 is at temperature T.
Therefore, air-conditioning system is in the long-term use process after the completion of method of the invention can accurately be installed
The situation of change of state parameter, and then the deletion condition of refrigerant can be judged by the situation of change of corresponding state parameter,
To when the degree of missing reaches degree (such as the ability for significantly affecting air-conditioning system) that must be supplemented with refrigerant, that is, can refer to
Show system cold medium shortage, such as report refrigerant miss fault etc..
Preferably, the state parameter of the air-conditioning system includes compressor frequency, pressure at expulsion, pressure of inspiration(Pi), exhaust temperature
Degree, electronic expansion valve opening, indoor heat exchanger enter the pipe degree of superheat, the indoor heat exchanger outlet pipe degree of superheat, and/or air conditioning capacity rate.
It is demonstrated experimentally that these state parameters are all closely related with the amount of refrigerant, therefore, by detecting under same ambient temperature conditions these
The change procedure of at least one of state parameter, can judge whether the amount of refrigerant lacks, and the degree of missing.It is aobvious
So, detecting state parameter is more, and testing result is more objective.
Preferably, when compressor frequency decrease beyond preset value, pressure at expulsion decrease beyond preset value, drop of suction pressure
Preset value is increased beyond more than preset value, delivery temperature, electronic expansion valve opening is increased beyond preset value, indoor heat exchanger enters pipe
The degree of superheat decrease beyond preset value, the indoor heat exchanger outlet pipe degree of superheat is increased beyond preset value, and/or the decline of air conditioning capacity rate is super
When crossing preset value, it is judged as coolant leakage.
That is, the variation degree of each state parameter and the relationship and variation of refrigerant missing degree can be determined by experiment
Rule, to be respectively that each state parameter determines reasonable preset value.For example, the preset value of each state parameter can be right
Ying Yu lacks degree to the more apparent refrigerant of the capacity of air-conditioning system.Then, reach identical environment again subsequent
When temperature T, when the deviation between the state parameter data acquired again and reference data reaches corresponding preset value, you can get it
The conclusion of coolant leakage.
In method of the invention, ambient temperature T may not necessarily be determined in advance, but random manner is taken to determine,
For example, after first powering on stable operation (or after the time of operation determination), it can acquisition state supplemental characteristic, and provide this
When ambient temperature be T, hereafter, can acquisition state parameter again as long as reaching identical ambient temperature again
Data.
It is preferable, however, that the ambient temperature T for being used for acquisition state parameter can also be first set before step S10,
To when ambient temperature reaches T for the first time, just execute step S10 after air-conditioning system booting operation.
For this purpose, being further comprised the steps of: before step S10
S00, selected ambient temperature T, and be T by ambient temperature at the time of, is set as data collection point.To,
When ambient temperature reaches data collection point for the first time, step S10 is executed；When ambient temperature reaches data acquisition again
When point, S20 is thened follow the steps, also, often reaches primary, then is repeated primary.
Preferably, in step S00, multiple and different data collection points can be set, correspond respectively to different extraneous rings
Border temperature Ti, i=1,2,3 ....
The ambient temperature in any area as locating for air-conditioning system can all have one than wider range,
Multiple and different temperature spots can be chosen within this range, so that it is determined that multiple mutually independent data collection points, extraneous ring
As long as border temperature reaches some data collection point, step S10 or step S20 is just executed, corresponding state parameter is acquired, this
Sample can obtain more state parameter data.And in step s 30 when comparing, only by same data collection point
The current measured data of (i.e. same ambient temperature) is compared with its reference data.
By the way that multiple data collection points are arranged, it is possible to prevente effectively from the external environment temperature selected when only one data collection point
It spends in extreme, causes to be difficult the problem of reaching again in the future.In addition, being sentenced according to the multi-group data of multiple data collection points
It is disconnected, also make testing result more fully with it is objective.
Preferably, in step S00, the ambient temperature range in air-conditioning system location is collected first, for example, annual minimum temperature
TminWith annual maximum temperature TmaxBetween range, in the ambient temperature range every k DEG C specify a data collection point, k
For scheduled temperature interval.
That is, in order to more comprehensively reflect state parameter situation of air-conditioning system under the conditions of various temperature, it can be at place
The multiple data collection points of selection in the long-term average temperature range on ground.The specified of data collecting point can also set according to the actual situation
Fixed, the setting of k value is smaller, and the data of collection are more, more advantageous to detection secondary refrigerant leakage situation.
Preferably, in step S00, internet can be accessed by the communication module of air-conditioning system, to collect air-conditioning system
The ambient temperature range in location.For the air-conditioning system for being provided with communication module, it can easily be obtained after installation
The temperature data needed.
Alternatively, in step S00, the environment temperature in air-conditioning system location can also be collected by way of being manually entered
Range.For example, installation personnel can be manually entered local annual minimum temperature T in debugging process in installationminMost with year
High-temperature TmaxEtc. data.
Alternatively, in step S00, it can also be the environment that one or more areas are stored in advance before air-conditioning system factory
Temperature range.For example, related personnel can collect the day destiny in various regions (the especially target marketing area of air-conditioning) before factory
According to such as annual minimum temperature TminWith annual maximum temperature TmaxDeng, and store it in unit.
Preferably, in step S10, the rate of load condensate of air-conditioning system when record acquires the state parameter of air-conditioning system for the first time；Step
It is only identical as the rate of load condensate in step S10 in the rate of load condensate of air-conditioning system when ambient temperature reaches T again in rapid S20
When, the state parameter of air-conditioning system is acquired again.
That is, for multi-line system, due to it is different at the time of, be switched on load (the indoor unit number to put into operation
Amount) may be different, and in the case where the load that is switched on is different, the state parameter of air-conditioning system is obviously different, thus this hair
Bright method needs to consider booting load, and otherwise, data comparison just loses meaning.For this purpose, being adopted in method of the invention for the first time
Rate of load condensate (such as quantity of indoor unit booting) at that time is recorded when collecting data, hereafter, when outdoor environment temperature reaches T again
When, first judge current rate of load condensate, only rate of load condensate is identical, just can acquisition state data again, to guarantee the accuracy of detection.
Preferably, in step S40, the preset value is that refrigerant missing amount reaches corresponding when 30%-35% in air-conditioning system
State parameter and reference data between deviation.It is demonstrated experimentally that when refrigerant missing amount reaches 30%-35%, for sky
The capacity of adjusting system is obvious.
Below in conjunction with a preferred embodiment of Fig. 2 method that the present invention will be described in detail:
(1) start
(2) local environment temperature data is collected
For example, (need to be by the communication module built in air-conditioner set) be collected in internet: collecting local environment temperature change model
It encloses, if minimum temperature is Tmin, maximum temperature Tmax, range of temperature Tmin~Tmax。
Alternatively, built-in before unit factory: related personnel collects the storage of various regions weather data into unit before dispatching from the factory.
If somewhere variation of ambient temperature range is 0 DEG C to 32 DEG C, i.e. Tmin=0 DEG C, Tmax=32 DEG C.
(3) data collecting point is specified
For example, specifying a data collecting point every k DEG C, total data collecting point is (Tmax-Tmin)/k.If k takes 4, then,
Data collecting point can be set to 0 DEG C, 4 DEG C, 8 DEG C, 12 DEG C, 16 DEG C, 20 DEG C, 24 DEG C, 28 DEG C, 32 DEG C of totally 9 points.
(4) data collection
When environment temperature reach data collecting point after, start collect data (such as can also prompt user carry out data receipts
Collection), indoor is run according to preset temperature, and data (such as compressor frequency, pressure at expulsion, the suction of collection are stored after set steady
Atmospheric pressure, delivery temperature, electronic expansion valve opening, indoor heat exchanger enter the pipe degree of superheat, the indoor heat exchanger outlet pipe degree of superheat and/
Or air conditioning capacity rate etc.), wherein the first time data that each temperature spot is collected are as reference data.
Such as when temperature reaches 28 DEG C for the first time, first time data collection is opened, the data storage collected after stable
For benchmark data；The data of n-th data collection (n=2,3 ...) with reference data for comparing.
(5) data calculate
The data collected for the second time or below and the data collected for the first time compare, and data are collected behind calculating parameter
And the deviation for the data collected for the first time.
(6) judgement whether coolant leakage
It is compared according to the deviation of calculating with preset value, whether judgment bias is greater than preset value.
(7) refrigerant miss fault is reported
When there is deviation greater than preset value, illustrate system cold medium shortage, i.e. secondary refrigerant leakage amount is exceeded, report refrigerant missing event
Barrier.
In order to prove the feasibility of method of the invention, below by way of experimental verification refrigerant missing for the shape of air-conditioning system
The influence of state parameter.
Experiment condition: some 16kW unit, the refrigerating operaton under nominal condition full load, and do and subtract refrigerant experiment, inspection
Coolant quantity is surveyed for compressor frequency, pressure at expulsion (i.e. high pressure), pressure of inspiration(Pi) (i.e. low pressure), delivery temperature, electric expansion valve
Aperture (machine EXV in i.e.), indoor heat exchanger enter the pipe degree of superheat, the indoor heat exchanger outlet pipe degree of superheat, and/or air conditioning capacity rate (i.e.
The ratio between actual measurement ability and nominal capacity), wherein the data collecting point set is 35 DEG C.
When experiment, when environment temperature reaches 35 DEG C, the stable progress first time data collection of unit is denoted as state A,
And this data is denoted as to the reference data of the data collecting point (35 DEG C), stores the reference data of above-mentioned each parameter.
When subsequent second of environment temperature reaches mutually synthermal (35 DEG C), second of data collection of beginning, and with first
The reference data of secondary storage compares, and is denoted as coolant leakage if beyond deviation preset value.If without departing from deviation preset value
It is then subsequent to continue to test.In order to shorten experimentation, when follow-up data is collected, refrigerant is artificially gradually reduced, is denoted as respectively
State B, C, D, E and F.
The results are shown in Table 1 for every state parameter.
Table 1: experimental result
From experimental result as can be seen that with coolant quantity the reduction degree of coolant leakage (corresponding different), in same isothermal
Under degree condition, same rate of load condensate, the trend of reduction is substantially presented in compressor frequency, and pressure at expulsion and pressure of inspiration(Pi) are substantially presented
The trend of increase is substantially presented in downward trend, delivery temperature and interior machine electronic expansion valve opening, enters the pipe degree of superheat and substantially presents
The trend of rising is substantially presented in downward trend, the outlet pipe degree of superheat, and apparent downward trend is then presented in the energy power rate of air-conditioning system.
Therefore, by detecting one or more of these state parameters, just clearly whether can judge coolant quantity
Decline, and substantially judge the degree of coolant quantity decline.
In addition, as shown in table 1, state B represents the refrigerant of leakage 20%, but actually to air-conditioning system cooling/heating amount
It influences and little；And after coolant leakage 35% (state C), energy power rate only has initial 76% or so, is affected.Therefore, may be used
Using by state C as a comparison point, the preset value of determination deviation amount, when departure shows that coolant leakage meets or exceeds C-shaped
When state, then coolant leakage is denoted as.
On the basis of above-mentioned work, the present invention also provides a kind of air-conditioning systems, use the present invention mentioned-above
Whether method detection refrigerant leaks.
Air-conditioning system of the invention can accurately detect coolant leakage degree, both be not easy to report by mistake or be not easy to fail to report, detection
As a result reliable, system run all right.
Those skilled in the art will readily recognize that above-mentioned each preferred embodiment can be free under the premise of not conflicting
Ground combination, superposition.
It should be appreciated that above-mentioned embodiment is merely exemplary, and not restrictive, without departing from of the invention basic
In the case where principle, those skilled in the art can be directed to the various apparent or equivalent modification or replace that above-mentioned details is made
It changes, is all included in scope of the presently claimed invention.
Claims (10)
1. a kind of method for detecting air-conditioning system coolant leakage, which is characterized in that comprising steps of
S10, in air-conditioning system operational process, when ambient temperature is T, acquire the state parameter of air-conditioning system, and will
Collected data are stored as reference data for the first time at this temperature；
S20, in air-conditioning system operational process, when ambient temperature reaches T again, again acquire air-conditioning system state
Parameter；
S30, it collected data will be compared again with the reference data, and calculate deviation between the two；
S40, when the deviation be more than preset value when, be judged as coolant leakage.
2. the method according to claim 1, wherein the state parameter of the air-conditioning system includes compressor frequency
Rate, pressure at expulsion, pressure of inspiration(Pi), delivery temperature, electronic expansion valve opening, indoor heat exchanger enter the pipe degree of superheat, indoor heat exchanger
The outlet pipe degree of superheat, and/or air conditioning capacity rate.
3. according to the method described in claim 2, it is characterized in that, when compressor frequency decrease beyond preset value, pressure at expulsion
It decrease beyond preset value, drop of suction pressure is more than that preset value, delivery temperature are increased beyond preset value, on electronic expansion valve opening
Rise is more than that preset value, indoor heat exchanger enter that the pipe degree of superheat decrease beyond preset value, the indoor heat exchanger outlet pipe degree of superheat is increased beyond
When preset value, and/or air conditioning capacity rate decrease beyond preset value, it is judged as coolant leakage.
4. the method according to claim 1, wherein being further comprised the steps of: before step S10
S00, selected ambient temperature T, and be T by ambient temperature at the time of, is set as data collection point.
5. according to the method described in claim 4, it is characterized in that, multiple and different data collection points is arranged in step S00,
Correspond respectively to different ambient temperature Ti。
6. according to the method described in claim 5, it is characterized in that, collecting the ring in air-conditioning system location first in step S00
Border temperature range, specifies a data collection point in the ambient temperature range every k DEG C, and k is scheduled temperature interval.
7. according to the method described in claim 6, it is characterized in that, being accessed in step S00 by the communication module of air-conditioning system
The ambient temperature range in air-conditioning system location is collected in internet, alternatively, collecting air-conditioning system institute by way of being manually entered
Ambient temperature range on ground, alternatively, the ambient temperature range in one or more areas is stored in advance in air-conditioning system before factory.
8. the method according to claim 1, wherein record acquires the state of air-conditioning system for the first time in step S10
The rate of load condensate of air-conditioning system when parameter；In step S20, when ambient temperature reaches T again, only in the load of air-conditioning system
When rate is identical as the rate of load condensate in step S10, the state parameter of air-conditioning system is acquired again.
9. method described in one of -8 according to claim 1, which is characterized in that in step S40, the preset value is air-conditioning system
Middle refrigerant missing amount reaches deviation when 30%-35% between corresponding state parameter and reference data.
10. a kind of air-conditioning system, which is characterized in that whether leaked using the detection refrigerant of method described in one of claim 1-9.
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