CN107208951A - Refrigerant amount abnormal detector and refrigerating plant - Google Patents
Refrigerant amount abnormal detector and refrigerating plant Download PDFInfo
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- CN107208951A CN107208951A CN201580072713.1A CN201580072713A CN107208951A CN 107208951 A CN107208951 A CN 107208951A CN 201580072713 A CN201580072713 A CN 201580072713A CN 107208951 A CN107208951 A CN 107208951A
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- 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
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Abstract
The refrigerant amount abnormal detector (300) of the present invention possesses control unit (320), and the control unit (320) is according to extraneous gas temperature detection value TH6 average value TH6meanAnd extraneous gas temperature detection value TH6 standard deviation TH6SD, condensation temperature detected value TH5 average value TH5meanAnd condensation temperature detected value TH5 standard deviation TH5SDAnd supercooling temperature detection value TH8 average value TH8meanAnd supercooling temperature detection value TH8 standard deviation TH8SD, calculate the temperature efficiency ε of supercooling heat exchanger 5 average value εmeanWith standard deviation εSD, the temperature efficiency ε of the index of detection short of refrigerant threshold epsilon will be used asthIt is set as than the average value ε from temperature efficiency εmeanSubtract temperature efficiency ε standard deviation εSDObtained from be worth small value, in temperature efficiency ε currency εrealLess than threshold epsilonthIn the case of detect short of refrigerant.
Description
Technical field
The present invention relates to refrigerant amount abnormal detector and refrigerating plant.
Background technology
As the method for the short of refrigerant in conventional detection refrigerating plant, for example, propose and utilize subcooler
Entrance refrigerant temperature and the temperature difference of outlet refrigerant temperature are (literary for example, referring to patent come the technology for detecting refrigerant leakage
Offer 1).In addition, it is proposed that the degree of subcooling in the exit based on subcooler detects the not enough technology (example of refrigerant amount
Such as, with reference to patent document 2).
Prior art literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 9-105567 publications
Patent document 2：Japanese Unexamined Patent Publication 2011-226704 publications
The content of the invention
The invention problem to be solved
But, in the method as patent document 1,2 using temperature detection short of refrigerant, such as according to system
The difference of the operating condition of device for cooling, the problem of accuracy of detection that there is refrigerant amount declines such.Further, since TEMP
The detection error of device, there is also the abnormality detection precise decreasing of refrigerant amount it is such the problem of.
The present invention makes to solve the above problems, and its object is to provide following refrigerant amount abnormality detection dress
Put and refrigerating plant：No matter the operating condition of refrigerating plant and the detection error of temperature sensor, can precision
The deficiency of refrigerant amount is detected well.
Means for solving the problems
The refrigerant amount abnormal detector of the present invention is connected with refrigerating plant, and the refrigerating plant possesses supercooling heat exchange
Device and the heat source side heat exchanger as condenser function, the refrigerant amount abnormal detector possess control unit, should
Control unit according to using the heat source side heat exchanger carry out heat exchange before extraneous gas temperature detection value average value with
And the extraneous gas temperature detection value standard deviation, flow through the heat source side heat exchanger outlet side refrigerant piping
Refrigerant the average value of condensation temperature detected value and the standard deviation of the condensation temperature detected value and flow through the mistake
Cool down the average value and the mistake of the supercooling temperature detection value of the refrigerant of the refrigerant piping of the outlet side of heat exchanger
The standard deviation of chilling temperature detected value, calculates the average value and standard deviation of the temperature efficiency of the supercooling heat exchanger,
Threshold value as the temperature efficiency of the index of detection short of refrigerant is set as than from the temperature by the control unit
The average value of efficiency is worth small value obtained from subtracting the standard deviation of the temperature efficiency, in the currency of the temperature efficiency
In the case of less than the threshold value, the control unit detects short of refrigerant.
The refrigerant amount abnormal detector of the present invention is connected with refrigerating plant, and the refrigerating plant possesses supercooling heat exchange
Device and the heat source side heat exchanger as condenser function, according to using the heat source side heat exchanger carry out heat exchange it
The currency of preceding extraneous gas temperature detection value, flow through the heat source side heat exchanger outlet side refrigerant piping system
The currency of the condensation temperature detected value of cryogen and flow through the supercooling heat exchanger outlet side refrigerant piping
The currency of the detected value of the supercooling temperature of refrigerant, calculates the currency of the temperature efficiency of the supercooling heat exchanger,
It is less than the feelings of the threshold value of the temperature efficiency of the index as detection short of refrigerant in the currency of the temperature efficiency
Under condition, the control unit is detected to short of refrigerant, and the threshold value is more than 0.350 and less than 0.550.
The refrigerating plant of the present invention possesses above-mentioned refrigerant amount abnormal detector.
The effect of invention
In accordance with the invention it is possible to provide following refrigerant amount abnormal detector and refrigerating plant：By the way that detection is made
The threshold value of the temperature efficiency of cold underdosage be changed to than subtracting the standard deviation of temperature efficiency from the average value of temperature efficiency and
The small value of obtained value, the deficiency of refrigerant amount is detected so as to precision well.
Brief description of the drawings
Fig. 1 is the refrigerant loop of an example of the refrigerating plant 100 for roughly representing embodiments of the present invention 1
Figure.
Fig. 2 is the refrigerant loop of another example for the refrigerating plant 100 for roughly representing embodiments of the present invention 1
Figure.
Fig. 3 is the refrigerant loop of the another example for the refrigerating plant 100 for roughly representing embodiments of the present invention 1
Figure.
Fig. 4 is the refrigerant loop of the another example for the refrigerating plant 100 for roughly representing embodiments of the present invention 1
Figure.
Fig. 5 be roughly represent embodiments of the present invention 1 refrigerating plant 100 in, refrigerant amount be not with not
The figure of the temperature change of refrigerant in the case of foot.
Fig. 6 is in the refrigerating plant 100 for roughly the represent embodiments of the present invention 1, situation of short of refrigerant
Under refrigerant temperature change figure.
Fig. 7 is in the refrigerant amount abnormal detector 300 for represent embodiments of the present invention 1, control unit 320 control
Make the flow chart of an example of processing.
Fig. 8 be roughly represent embodiments of the present invention 1 refrigerant amount abnormal detector 300 in it is of the invention
The figure of effect.
Fig. 9 is in the refrigerant amount abnormal detector 300 for represent embodiments of the present invention 2, control unit 320 control
Make the flow chart of an example of processing.
Figure 10 is the present invention in the refrigerant amount abnormal detector 300 for roughly represent embodiments of the present invention 2
Effect figure.
Embodiment
Embodiment 1.
Use refrigerating plant 100 and refrigerant amount abnormal detector of Fig. 1~Fig. 3 to embodiments of the present invention 1
300 structure is illustrated.Fig. 1 is the refrigerant loop figure of an example of the refrigerating plant 100 for representing present embodiment 1.
In addition, including in the following drawings including Fig. 1, the relation and shape of the size of each component parts and actual size sometimes
Relation and shape it is different.
Structure to the refrigerant loop of the refrigerating plant 100 of present embodiment 1 is illustrated.
Fig. 1 refrigerating plant 100 have make refrigerant successively compressor 1, oil eliminator 2, heat source side heat exchanger 3,
The refrigerant that liquid receiver 4, supercooling heat exchanger 5, decompressor 6, load-side heat exchanger 7 and reservoir 8 are circulated
Loop.
Compressor 1 is the fluid machinery of capacity variable type, compresses sucked low pressure refrigerant, is arranged as high-pressure refrigerant
Go out.Compressor 1 can for example use scroll compressor, and the scroll compressor utilizes Frequency Converter Control speed.
The refrigerator oil that 2 pairs of high-pressure refrigerants discharged from compressor 1 of oil eliminator are included separate removing, and reduces
The amount for the refrigerator oil that high-pressure refrigerant is included.The refrigerator oil removed that is separated returns to compressor 1 via oil return pipe 2a.
In Fig. 1, heat source side heat exchanger 3 is the heat exchanger as condenser function.Heat source side heat exchanger 3
Implement the high-pressure refrigerant and extraneous gas discharged from compressor 1 (for example, in the feelings that refrigerating plant 100 is conditioner
Under condition be outdoor air) heat exchange, by refrigerant to extraneous gas release heat.Heat source side heat exchanger 3 for example can to by
The extraneous gas that heat source side heat exchanger is sent with fan (not shown) releases heat.Heat source side heat exchanger 3 can for example be constituted
Add pipeline type heat exchanger for the fin of cross-fin formula, the fin of the cross-fin formula adds pipeline type heat exchanger to include heat transfer
Pipe and multiple fins.
Liquid receiver 4 is, for example, the container of drum, and the container of the drum can be according to condensation temperature, outside
The raffinate system produced in the capacity of gas temperature or compressor 1, the refrigerant loop for temporarily retaining refrigerating plant 100
Cryogen.Liquid receiver 4 is by temporarily retaining remaining liq refrigerant, so as to be adjusted according to the load of refrigerating plant 100
Flow through the refrigerant amount of the refrigerant loop of refrigerating plant 100.
Supercooling heat exchanger 5 is implemented to lodge in the heat friendship of the high pressure liquid refrigerant of liquid receiver 4 and extraneous gas
Change.Using the heat exchange in supercooling heat exchanger 5, the high pressure liquid refrigerant for lodging in liquid receiver 4 is changed into being too cold
But liquid refrigerant.Supercooling heat exchanger 5 can both be integrally formed as cross-fin formula with heat source side heat exchanger 3
Fin add pipeline type heat exchanger, other structures can also be made.
Decompressor 6 makes the high pressure liquid refrigerant expansion flowed out from supercooling heat exchanger 5 and depressurized.It is used as decompression
Device 6, such as, using electric expansion valve (for example, linear electron expansion valve), the electric expansion valve can be multistage or continuously
Adjust aperture.In addition, being used as decompressor 6, additionally it is possible to use capillary etc..
In Fig. 1, load-side heat exchanger 7 is the heat exchanger as radiator (evaporator) function.Load-side
Heat exchanger 7 is following heat exchanger：Implement the refrigerant after being depressurized using decompressor 6 with air (for example, in refrigerating plant
100 be conditioner in the case of be room air) heat exchange, utilize refrigerant cooling air.Load-side heat exchange
Device 7 for example can release heat to the extraneous gas sent by load-side heat exchanger with fan (not shown).Load-side heat exchange
Device 7 can for example be configured to the fin plus pipeline type heat exchanger of cross-fin formula, and the fin of the cross-fin formula adds pipeline type
Heat exchanger includes heat-transfer pipe and multiple fins.
Reservoir 8 has：Refrigerant retains function, retains remaining refrigerant；And gas-liquid separating function, by making
The liquid refrigerant temporarily produced when operating condition changes is detained, so as to prevent substantial amounts of liquid refrigerant to be flowed into pressure
Contracting machine 1.
Fig. 1 refrigerating plant 100 possesses heat source unit 10, load unit 20, liquid extension pipe arrangement 30 and gas extension
Pipe arrangement 40.Heat source unit 10 contains compressor 1, oil eliminator 2, heat source side heat exchanger 3, liquid receiver 4, supercooling heat
Exchanger 5 and reservoir 8.Heat source unit 10 for example can the conduct in the case where refrigerating plant 100 is conditioner
Outdoor unit is arranged at outdoor.Load unit 20 contains decompressor 6 and load-side heat exchanger 7.Load unit 20
Such as in the case where refrigerating plant 100 is conditioner, interior can be arranged at as indoor unit.
Liquid extension pipe arrangement 30 is following refrigerant piping：By from the supercooling heat exchanger 5 for being contained in heat source unit 10
Outlet side extension refrigerant piping, the refrigerant with extending from the entrance side of the decompressor 6 for being contained in load unit 20
Connected between pipe arrangement.Gas extension pipe arrangement 40 is following refrigerant piping：It will be handed over from the load-side heat for being contained in load unit 20
The refrigerant piping of the outlet side extension of parallel operation 7, the refrigeration extended with the entrance side from the reservoir 8 for being contained in heat source unit 10
Connected between agent pipe arrangement.
In addition, the refrigerating plant 100 of present embodiment 1 can also have distance type condensing unit, wherein, the quilt of compressor 1
Interior is arranged at, heat source side heat exchanger 3 and supercooling heat exchanger 5 are arranged at outdoor.Using Fig. 2~Fig. 4, illustrate tool
There is the example of the refrigerating plant 100 of distance type condensing unit.
Fig. 2 is the refrigerant loop figure of another example for the refrigerating plant 100 for roughly representing present embodiment 1.Fig. 2's
Refrigerating plant 100 has in the same manner as Fig. 1 makes refrigerant successively in compressor 1, oil eliminator 2, heat source side heat exchanger 3, liquid
The refrigerant that body receiver 4, supercooling heat exchanger 5, decompressor 6, load-side heat exchanger 7 and reservoir 8 are circulated is returned
Road.
Fig. 2 refrigerating plant 100 possesses heat source unit 10, load unit 20, liquid extension pipe arrangement 30, gas extension pipe arrangement
40th, the extension pipe arrangement of compression unit the 50, the 1st 60a, the 2nd extension pipe arrangement 60b, the 3rd extension pipe arrangement 60c and the 4th extension pipe arrangement 60d.
Heat source unit 10 contains heat source side heat exchanger 3 and supercooling heat exchanger 5.Load unit 20 contains decompressor 6
And load-side heat exchanger 7.Compression unit 50 contain compressor 1, oil eliminator 2, liquid receiver 4, reservoir 8 and
Relay pipe arrangement 9.Compression unit 50 for example can be configured at interior in the case where refrigerating plant 100 is conditioner.Receive
The relaying pipe arrangement 9 for being dissolved in compression unit 50 is following refrigerant piping：For via compression unit 50 is by heat source unit 10 and bears
Carrier unit 20 is connected, and forms refrigerant loop.
Liquid extension pipe arrangement 30 is following refrigerant piping：By be contained in compression unit 50 relaying pipe arrangement 9, with from collecting
Connected between the refrigerant piping of the entrance side extension of the decompressor 6 of load unit 20.Gas extension pipe arrangement 40 is as follows
Refrigerant piping：By from the refrigerant piping of the outlet side of the load-side heat exchanger 7 for being contained in load unit 20 extension, with from
It is contained in connection between the refrigerant piping of the entrance side of the reservoir 8 of heat source unit 10 extension.
1st extension pipe arrangement 60a is following refrigerant piping：By from the outlet for the oil eliminator 2 for being contained in compression unit 50
The refrigerant piping of side extension, the refrigerant extended with the entrance side from the heat source side heat exchanger 3 for being contained in heat source unit 10
Connected between pipe arrangement.2nd extension pipe arrangement 60b is following refrigerant piping：It will be handed over from the heat source side heat for being contained in heat source unit 10
What the refrigerant piping of outlet side extension and the entrance side from the liquid receiver 4 for being contained in compression unit 50 of parallel operation 3 extended
Connected between refrigerant piping.3rd extension pipe arrangement 60c is following refrigerant piping：By from the liquid for being contained in compression unit 50
The refrigerant piping of the outlet side extension of receiver 4 and the entrance side from the supercooling heat exchanger 5 for being contained in heat source unit 10
Connected between the refrigerant piping of extension.4th extension pipe arrangement 60d is following refrigerant piping：Connection is from being contained in heat source unit
The refrigerant piping of the outlet side extension of 10 supercooling heat exchanger 5 and the relaying pipe arrangement 9 for being contained in compression unit 50.
Fig. 3 is the refrigerant loop figure of the another example for the refrigerating plant 100 for roughly representing present embodiment 1.Fig. 3's
Refrigerating plant 100 is accommodated in heat source unit 10, without the 2nd extension pipe arrangement 60b and the 3rd extension except liquid receiver 4
It is the identical structure of refrigerating plant 100 with Fig. 2 outside pipe arrangement 60c point.
Fig. 4 is the refrigerant loop figure of the another example for the refrigerating plant 100 for roughly representing present embodiment 1.In Fig. 4
Refrigerating plant 100 in, the bimetallic tube supercooling heat exchanger 5a for carrying out middle injection to compressor 1 is accommodated in compression
Unit 50.As shown in figure 4, the supercooling heat exchanger 5 of present embodiment 1 can also be bimetallic tube supercooling heat exchanger 5a.
Bimetallic tube supercooling is connected to from branch's pipe arrangement of bimetallic tube supercooling heat exchanger 5a high pressure side outlet branch
Heat exchanger 5a low pressure side inlet.Be configured with electric expansion valve 5b in branch's pipe arrangement, electric expansion valve 5b can it is multistage or
Person continuously adjusts aperture.The refrigerant piping being connected with bimetallic tube supercooling heat exchanger 5a low side outlets is noted with middle
Enter pipe 5c connections, the middle ascending pipe 5c supplies the refrigerant of low pressure to the intermediate pressure section of compressor 1.Fig. 4 refrigerating plant 100
Except bimetallic tube supercooling heat exchanger 5a be accommodated in compression unit 50, as described above constitute in the middle of this point of injecting mechanism and
It is the identical knot of refrigerating plant 100 with Fig. 2 outside without the 3rd extension pipe arrangement 60c and the 4th extension pipe arrangement 60d, this puts
Structure.
Next, the sensor class of the refrigerating plant 100 to being configured at present embodiment 1 is illustrated.
The refrigerating plant 100 of present embodiment 1 possesses the 1st temperature sensor 120, the 2nd temperature sensor 140, the 3rd temperature
The temperature sensor 180 of sensor 160 and the 4th.
1st temperature sensor 120 is configured in the outlet side of heat source side heat exchanger 3 and supercooling heat exchanger 5
The temperature of the refrigerant of refrigerant piping is flowed through in the refrigerant piping of entrance side connection, detection.2nd temperature sensor 140 by with
The refrigerant piping for being connected the outlet side of supercooling heat exchanger 5 with the entrance side of decompressor 6 is placed in, refrigeration is flowed through in detection
The temperature of the refrigerant of agent pipe arrangement.3rd temperature sensor 160 is configured in the upper of the air stream that flows through heat source side heat exchanger 3
Side is swum, the high-pressure refrigerant for detecting and flowing through supercooling heat exchanger 5 carries out the temperature of the extraneous gas before heat exchange.4th
Temperature sensor 180 is configured in the refrigerant for being connected the outlet side of decompressor 6 with the entrance side of load-side heat exchanger 7
The temperature of the refrigerant of refrigerant piping is flowed through in pipe arrangement, detection.
It is used as the 1st temperature sensor 120, the 2nd temperature sensor 140, the 3rd temperature sensor 160 and the 4th TEMP
The material of device 180, uses semiconductor (for example, thermistor) or metal (for example, temperature detecting resistance body) etc..In addition, the 1st temperature
Sensor 120, the 2nd temperature sensor 140, the 3rd temperature sensor 160 and the 4th temperature sensor 180 both can be by identicals
Material is constituted, and can also be made up of different materials.
Next, pair refrigerant amount abnormal detector 300 being connected with the refrigerating plant 100 of present embodiment 1 is carried out
Explanation.
Refrigerant amount abnormal detector 300 possesses control unit 320 and display part 340, and detection is filled in refrigerant loop
Refrigerant amount exception, show testing result.By the 1st temperature sensor 120, the 2nd temperature sensor 140, the 3rd TEMP
The temperature information that the temperature sensor 180 of device 160 and the 4th is detected is input into refrigerant amount abnormality detection dress as electric signal
Put 300.
In Fig. 1, refrigerant amount abnormal detector 300 is the structure being connected with heat source unit 10.In Fig. 2~Fig. 4,
Refrigerant amount abnormal detector 300 is the structure being connected with compression unit 50.The connection of refrigerant amount abnormal detector 300
Position not limited to this, can also be connected with load unit 20.Alternatively, it is also possible to by refrigerant amount abnormal detector 300 with system
Device for cooling 100 is integrally constituted.In addition, the control unit 320 of refrigerant amount abnormal detector 300 can also for example be filled with refrigeration
The control unit (not shown) for putting the frequency of 100 control compressor 1 is integrally constituted.
Control unit 320 possesses microcomputer, and the microcomputer possesses CPU, ROM, RAM, I/O port etc..Display part
Testing result of 340 display refrigerant amounts etc., is constituted such as by 7 sections of LED.
The control unit 320 of present embodiment 1 is according to the extraneous gas carried out using heat source side heat exchanger 3 before heat exchange
The average value of temperature detection value and the standard deviation of extraneous gas temperature detection value, the outlet for flowing through heat source side heat exchanger 3
The average value of the condensation temperature detected value of the refrigerant of the refrigerant piping of side and the standard deviation of condensation temperature detected value and
Flow through the supercooling temperature detection value of the refrigerant of the refrigerant piping of the outlet side of supercooling heat exchanger 5 average value and
The standard deviation of supercooling temperature detection value, calculates the average value and standard deviation of the temperature efficiency of supercooling heat exchanger 5, will
Threshold value as the temperature efficiency of the index of detection short of refrigerant is set as than subtracting temperature from the average value of temperature efficiency
It is worth small value obtained from the standard deviation of efficiency, in the case where the currency of temperature efficiency is less than the threshold value after change to system
Cold underdosage is detected.
Herein, to the temperature efficiency ε of supercooling heat exchanger 5 calculated by control unit 320 average value εmeanAnd mark
Quasi- deviation εSDIllustrate.In the following description, the temperature that will be detected by each temperature sensor (120,140,160,180)
Define as follows.
The system of the refrigerant piping for the outlet side for flowing through heat source side heat exchanger 3 that 1st temperature sensor 120 is detected
The detected value of refrigerant temperature is set to " condensation temperature detected value TH5 ".Due to dividing for the 1st detected value of itself of temperature sensor 120
The discrete of the resistance value of (discrete) or control base board (not shown) etc. is dissipated, condensation temperature detected value TH5 is according to normal distribution
Stochastic variable.Condensation temperature detected value TH5 average value is being set to TH5meanAnd by condensation temperature detected value TH5 standard
Deviation is set to TH5SDIn the case of, TH5=TH5mean±TH5SDRelation set up.In addition, working as condensation temperature detected value TH5
Preceding value is set to TH5real。
The system of the refrigerant piping for the outlet side for flowing through supercooling heat exchanger 5 that 2nd temperature sensor 140 is detected
The detected value of refrigerant temperature is set to " supercooling temperature detection value TH8 ".Due to the 2nd temperature sensor 140 detected value of itself
The resistance value of discrete or control base board (not shown) etc. it is discrete, supercooling temperature detection value TH8 is according to normal distribution
Stochastic variable.Supercooling temperature detection value TH8 average value is being set to TH8meanAnd by supercooling temperature detection value TH8 mark
Quasi- deviation is set to TH8SDIn the case of, TH8=TH8mean±TH8SDRelation set up.In addition, by supercooling temperature detection value TH8
Currency be set to TH8real。
The detected value for the extraneous gas temperature that 3rd temperature sensor 160 is detected is set to " extraneous gas temperature detection value
TH6”.The resistance value of discrete or control base board (not shown) due to the 3rd temperature sensor 160 detected value of itself etc. from
Dissipate, extraneous gas temperature detection value TH6 is the stochastic variable according to normal distribution.By extraneous gas temperature detection value TH6's
Average value is set to TH6meanAnd extraneous gas temperature detection value TH6 standard deviation is set to TH6SDIn the case of, TH6=
TH6mean±TH6SDRelation set up.In addition, extraneous gas temperature detection value TH6 currency is set into TH6real。
The detected value of the temperature for the refrigerant for flowing through refrigerant piping that 4th temperature sensor 180 is detected is set to steam
Send out temperature detection value ET.Due to the electricity of the discrete or control base board (not shown) of the 4th temperature sensor 180 detected value of itself
Resistance etc. it is discrete, evaporating temperature detected value ET is the stochastic variable according to normal distribution.By evaporating temperature detected value ET's
Average value is set to ET6meanAnd evaporating temperature detected value ET standard deviation is set to ETSDIn the case of, ET=ETmean±ETSD
Relation set up.In addition, evaporating temperature detected value ET currency is set into ETreal。
The temperature efficiency ε of supercooling heat exchanger 5 is by the supercooling of the refrigerant in the exit of supercooling heat exchanger 5
Spend (condensation temperature detected value TH5- supercooling temperature detection value TH8) divided by the maximum temperature difference of supercooling heat exchanger 5 is (cold
Solidifying temperature detection value TH5- extraneous gas temperature detection value TH6) obtained from be worth, utilize formula (1)
[formula 1]
To calculate.The temperature efficiency ε of supercooling heat exchanger 5 represents the performance of supercooling heat exchanger 5, with degree of subcooling
Compare, change small as caused by the operating condition of refrigerating plant 100, so the judgement precision of short of refrigerant can be improved.
It is less than predetermined temperature efficiency ε threshold epsilon in the temperature efficiency ε of supercooling heat exchanger 5thIn the case of, to refrigerant
Amount deficiency is detected.
The currency ε for being temperature efficiency ε in the temperature efficiency ε of calculatingrealIn the case of, temperature efficiency εrealAccording to usual
Arithmetic, utilize formula (2)
[formula 2]
To calculate.For example, in condensation temperature detected value TH5 currency TH5realFor 43 DEG C, extraneous gas temperature detection
Value TH6 currency TH6realFor 50 DEG C, supercooling temperature detection value TH8 currency TH8realIn the case of 44 DEG C, temperature
Efficiency ε currency εrealFor (50-44)/(50-43)=0.857.
Because the temperature efficiency ε for considering calculating is the situation of stochastic variable, thus consider general stochastic variable X1,
X2.Herein, stochastic variable X1 average value is set to X1mean, stochastic variable X1 standard deviation is set to X1SD.In addition will be with
The average value of machine variable X 2 is set to X2mean, stochastic variable X2 standard deviation is set to X2SD。
In stochastic variable X1, X2 independently of each other according to normal distribution in the case of, subtraction X1-X2 utilize formula (3)
[formula 3]
To calculate.
In addition, division X1/X2 utilizes formula (4)
[formula 4]
To calculate.
The error of each temperature sensor (120,140,160,180) is generally ± 1 DEG C.Therefore, as an example, it is considered to
Extraneous gas temperature detection value TH6 is 43 ± 1 DEG C, condensation temperature detected value TH5 is 50 ± 1 DEG C, supercooling temperature detection value TH8
For 44 ± 1 DEG C of situation.For the molecule TH5-TH8 of formula (1) value, when X1 is set into TH5 in formula (3), X2 is set
During for TH8, it is changed into formula (5).
[formula 5]
For the denominator TH5-TH6 of formula (1) value, when X1 is set into TH5 in formula (3), when X2 is set into TH6,
It is changed into formula (6).
[formula 6]
Therefore, for the temperature efficiency ε of supercooling heat exchanger 5, when X1 is set into TH5-TH8 in formula (4),
When X2 is set into TH5-TH6, it is changed into formula (7).
[formula 7]
In this case, the temperature efficiency ε of supercooling heat exchanger 5 average value εmeanFor 0.857, supercooling heat exchange
The temperature efficiency ε of device 5 standard deviation εSDFor 0.266.
In addition, the short of refrigerant of refrigerating plant 100, degree of subcooling (condensation temperature detected value TH5- supercooling temperature
Detected value TH8) it is presumed to ε=0.000 ± 0.266 for the temperature efficiency ε in the case of 0.
Consider the temperature efficiency ε of above standard deviation εSD, for example by temperature efficiency ε threshold epsilonthIt is set to εth=0.37,
Short of refrigerant is detected as in the case of less than 0.37, more than 0.37 in the case of to be detected as refrigerant amount normal, from
And can precision detect the deficiency of refrigerant amount well.Threshold epsilonthBy being set to 0.350≤εthLess than≤0.55 scope,
So that and εth=0.37 situation similarly, can precision detect the deficiency of refrigerant amount well.In addition it is also possible to 0.37
Short of refrigerant is detected as in the case of below, refrigerant amount is detected as in the case of more than 0.37 normal.
Next, the action using Fig. 1 refrigerant loop to the refrigerating plant 100 of present embodiment 1 is illustrated.
The gas refrigerant for the HTHP discharged from compressor 1 is in the freezing for being included refrigerant by oil eliminator 2
After machine oil separation, flowed into as the heat source side heat exchanger 3 of condenser function.It is flowed into heat source side heat exchanger 3
HTHP gas refrigerant by releasing heat to the media of the low temperature such as outdoor air so that by heat exchange, a part or
Person integrally condenses, and is changed into high pressure liquid refrigerant (liquid or two-phase state), retains in liquid receiver 4.Lodge in liquid
The high pressure liquid refrigerant of receiver 4 is flowed into supercooling heat exchanger 5.It is flowed into the highly pressurised liquid of supercooling heat exchanger 5
Refrigerant releases heat by the medium to low temperature such as outdoor airs, so as to further be changed into the liquid after supercooling by heat exchange
Refrigerant.It is over cooled the liquid refrigerant after the supercooling of heat exchanger 5 to flow into decompressor 6, is inflated and depressurizes, become
For the two-phase system cryogen of low-temp low-pressure.The gas-liquid two-phase refrigerant of the low-temp low-pressure flowed out from decompressor 6 is flowed into as steaming
Send out the load-side heat exchanger 7 of device function.The gas-liquid two-phase refrigerant of load-side heat exchanger 7 is flowed into room air
(heat absorption) is cooled down, the high gas-liquid two-phase refrigerant of gas refrigerant or aridity of low-temp low-pressure is evaporated and be changed into.Gas
Cryogen or the high gas-liquid two-phase refrigerant of aridity are being removed liquid phase from load-side heat exchanger 7 via reservoir 8
After composition, compressor 1 is inhaled into.The gas refrigerant for being drawn into compressor 1 is compressed, and is changed into the gas system of HTHP
Cryogen, is discharged from compressor 1.In Fig. 1 refrigerating plant 100, repeat the circulation of the above.
Next, being entered using Fig. 5 and Fig. 6 to the refrigerant charge and the relation of degree of subcooling in refrigerating plant 100
Row explanation.
Fig. 5 is in the refrigerating plant 100 for roughly represent present embodiment 1, refrigerant amount was not and not enough feelings
The figure of the temperature change of refrigerant under condition.In Fig. 4, longitudinal arrow represents temperature, is uprised towards direction of arrow temperature.It is horizontal
To arrow represent refrigerating plant 100 the flowing along refrigerant refrigerant path.Region A roughly represents supercooling heat
The refrigerant path of the refrigerant piping (liquid pipe) of the outlet side of exchanger 5.Region B roughly represents supercooling heat exchanger 5
Refrigerant path.Region C is roughly denoted as the refrigerant path of the heat source side heat exchanger 3 of condenser function.
Solid line a with arrow roughly represent refrigerant amount be not with deficiency in the case of refrigerant temperature change.Symbol D tables
Show refrigerant amount be not with deficiency in the case of supercooling heat exchanger 5 in degree of subcooling.Region E represents refrigerant amount
Be not with deficiency in the case of two-phase region.Region F represent refrigerant amount be not with deficiency in the case of supercooling
Region.
In the case where refrigerant amount was not with deficiency, the two-phase system cryogen from heat source side heat exchanger 3 (region C)
(region E) is by the gas-liquid separation of liquid receiver 4.Liquid receiver 4 has retained liquid refrigerant, is changed into saturation liquid status.It is changed into
The liquid refrigerant of saturation liquid status is flowed into supercooling heat exchanger 5 (region F) from liquid receiver 4.Therefore, supercooling is utilized
But the heat exchange in heat exchanger 5 (region B) carries out supercooling (symbol D) to liquid refrigerant, is flowed from supercooling heat exchanger 5
Go out to refrigerant piping (region A).
Fig. 7 is in the refrigerating plant 100 for roughly represent present embodiment 1, system in the case of short of refrigerant
The figure of the temperature change of cryogen.In the figure 7, also in the same manner as Fig. 5, longitudinal arrow represents temperature, towards direction of arrow temperature
Uprise.Horizontal arrow represents the refrigerant path of the flowing along refrigerant of refrigerating plant 100.Region A is roughly represented
The refrigerant path of the refrigerant piping (liquid pipe) of the outlet side of supercooling heat exchanger 5.Region B roughly represents supercooling heat
The refrigerant path of exchanger 5.Region C is roughly denoted as the refrigeration of the heat source side heat exchanger 3 of condenser function
Agent path.
In the figure 7, the temperature of the refrigerant in the case that the solid line b with arrow roughly represents short of refrigerant becomes
Change.Dotted line a1 with arrow roughly represent refrigerant amount be not with deficiency in the case of refrigerant temperature change, with
Fig. 5 solid line with arrow is identical.Symbol D1 represent short of refrigerant in the case of supercooling heat exchanger 5 in supercooling
But spend.Region E1 represent short of refrigerant in the case of two-phase region.In the case that region F1 represents short of refrigerant
Supercooling region.Region G represents the condenser zone produced in the case of short of refrigerant.
In the case of short of refrigerant, the two-phase system cryogen and system of the outlet side of heat source side heat exchanger 3 (region C)
It compared with not enough situation is the high state (region E1) of aridity that cryogen amount, which was not,.When the high two-phase system cryogen stream of aridity
When entering to liquid receiver 4, liquid refrigerant is not retained in liquid receiver 4.Due to not retained in liquid receiver 4
Liquid refrigerant, so that the refrigerant of two-phase state is flowed into supercooling heat exchanger 5 (region B) (region G).In refrigerant amount
In the case of deficiency, produce due to heat exchange that two-phase system cryogen is condensed liquefied area in supercooling heat exchanger 5 (region B)
Domain (region G).After two-phase system cryogen is condensed liquefaction, liquid refrigerant is over cooled (region F1), is handed over from supercooling heat
Parallel operation 5 flows out to refrigerant piping (region A).Therefore, short of refrigerant situation (under solid line b), with refrigerant amount not
It was that compared with not enough situation (dotted line a1), degree of subcooling reduces (symbol D1).
The refrigerant amount abnormal detector 300 of present embodiment 1 is used compared with degree of subcooling by refrigerating plant 100
Equable supercooling heat exchanger caused by operating condition (change, the change of evaporating temperature) such as extraneous gas temperature
5 temperature efficiency ε detects the deficiency of refrigerant amount.Next, illustrating that the refrigerant amount of present embodiment 1 is different using Fig. 7
One example of the control process of the refrigerant amount abnormality detection in the control unit 320 of normal detection means 300.
Fig. 7 is in the refrigerant amount abnormal detector 300 for represent present embodiment 1, control unit 320 control process
An example flow chart.For the processing shown in Fig. 7, in order to by the temperature efficiency ε of supercooling heat exchanger 5 threshold
Value εthAppropriate value is adjusted to, is at least performed in the operation process of refrigerating plant 100 1 time, or is reducing evaporating temperature
The operating condition such as the situation of setting at least perform 1 time when being changed.
In present embodiment 1, it is set to control unit 320 and possesses storage device, the supercooling heat exchanger 5 for being stored with current
Temperature efficiency ε threshold epsilonth.In addition, in the storage device of control unit 320, be stored with temperature information, the temperature information is
Detected by each temperature sensor (120,140,160,180).
In step s 110, control unit 320 according under specific moving condition (for example, evaporating temperature detected value ET=-
50 DEG C), condensation temperature detected value TH5, supercooling temperature detection value TH8 and extraneous gas temperature detection value TH6 calculate
The temperature efficiency ε of supercooling heat exchanger 5.Temperature efficiency ε is calculated using above-mentioned formula (1), formula (3) and formula (4).Calculate
Temperature efficiency ε be stochastic variable according to normal distribution, temperature efficiency ε=εmean±εSD。
In the step s 120, in control unit 320, temperature efficiency ε threshold epsilon is judgedthWhether than the 1st a reference value
(εmean- εSD) greatly, the 1st a reference value (εmean- εSD) it is average value from the temperature efficiency ε calculated in step s 110
εmeanSubtract temperature efficiency ε standard deviation εSDObtained from.In temperature efficiency ε threshold epsilonthLess than the situation of the 1st a reference value
Under, enter step S140.
It is being determined as temperature efficiency ε current threshold epsilonthFor the 1st a reference value (εmean- εSD) more than in the case of, in step
In rapid S130, changing temperature efficiency ε current threshold epsilonth.In present embodiment 1, temperature efficiency ε threshold epsilonthIt is set
Into less than the 1st a reference value.
In step S140, control unit 320 is based on above-mentioned formula (2), calculates temperature efficiency ε currency εreal, in control
In portion 320, temperature efficiency ε currency ε is judgedrealWhether temperature efficiency ε threshold epsilon is less thanth。
In temperature efficiency ε currency εrealLess than temperature efficiency ε threshold epsilonthIn the case of, in step S150, control
The deficiency of refrigerant amount in the detection of portion 320 refrigerating plant 100 processed.
In temperature efficiency ε currency εrealFor temperature efficiency ε threshold epsilonthIn the case of above, in step S160,
The refrigerant amount that control unit 320 is detected as in refrigerating plant 100 is normal.
The information that control unit 320 can also normally look like the information and refrigerant amount of the meaning of short of refrigerant
Report to display part 340.Above- mentioned information can for example utilize the report of the error code based on 7 sections of LED or lighting for LED
Or flicker etc. report.Above- mentioned information can also for example be reported in the control base board of refrigerating plant 100, can also utilize buzzing
Device, sound etc. are reported.
As described above, the refrigerant amount abnormal detector 300 of present embodiment 1 possesses control unit 320, the control
Portion 320 processed will be used as the temperature efficiency ε of the index of detection short of refrigerant threshold epsilonthIt is set as than putting down from temperature efficiency ε
Average εmeanSubtract temperature efficiency ε standard deviation εSDObtained from be worth small value.
In refrigerating plant 100, in the case where there occurs the mistake of refrigerant amount with deficiency, cause to produce refrigerating plant
A problem that 100 ability decline and the structural device of refrigerating plant 100 are damaged.In order to prevent refrigerating plant 100 not
The generation of good situation, in conventional refrigerating plant, possesses the mistake and deficiency for the refrigerant amount for judging to be filled in refrigerating plant
Function.
In not possessing refrigerating plant of the mistake for judging refrigerant amount with not enough function, as long as being deposited in liquid receiver
In residual refrigerant, then also influence is not brought on the operating of refrigerating plant even if refrigerant leakage.Therefore, it there occurs refrigerant
In the case of leakage, also simply the liquid level of residual refrigerant declines, and existing can not detect untill the residual refrigerant disappears
The problem of refrigerant leakage is such.
In order to solve the above problems, there is provided detect refrigerant not using temperature efficiency in conventional refrigerating plant
The refrigerating plant of foot.In the detection carried out using temperature efficiency, in the operating condition that outside gas temperature is high, evaporating temperature is low
Under refrigerating plant operating when, the degree of subcooling (condensation temperature with supercooling temperature difference) of refrigerant and supercooling heat are handed over
Which in maximum temperature difference (condensation temperature with extraneous gas temperature difference) in parallel operation is all small value.Accordingly, there exist
Error influence of the temperature sensor relative to temperature efficiency becomes big, it is difficult to the problem of carrying out detecting such using temperature efficiency.Cause
This, under the operating condition that outside gas temperature is high, evaporating temperature is low, exists and is detected as refrigeration although refrigerant amount is normal
Underdosage, on the contrary, although be detected as short of refrigerant refrigerant amount it is normal so the problem of.
But, according to present embodiment 1, pass through the threshold epsilon of the temperature efficiency ε by short of refrigerant is detectedthIt is changed to
Than the average value ε from temperature efficiency εmeanSubtract temperature efficiency ε standard deviation εSDObtained from be worth small value, so as to essence
Degree detects the deficiency of refrigerant amount well.Illustrate the specific effect of present embodiment 1 using Fig. 8.
Fig. 8 is the effect of the invention in the refrigerant amount abnormal detector 300 for roughly represent present embodiment 1
Figure.The arrow of longitudinal direction represents that temperature efficiency ε, temperature efficiency ε become big towards the direction of arrow.The broken line c of solid line roughly represents to make
The high average value ε of the possibility that can use for the temperature efficiency ε of stochastic variablemeanFollowing number range.Along transverse direction
Arrow diagramming represents the threshold epsilon of temperature efficiency ε before changingthDotted line and represent the 1st a reference value (εmean- εSD) reality
Line.It is the threshold epsilon of the temperature efficiency ε after the change of present embodiment 1 along the chain-dotted line of horizontal arrow diagrammingth, dotted line with
White block arrow between chain-dotted line represents the threshold epsilon of present embodiment 1thChange.
Herein, it is contemplated that the refrigerant amount in refrigerating plant 100 is normal, the situation of temperature efficiency ε=0.857 ± 0.266.
In this case, temperature efficiency ε currency ε is randomly producedrealIt is detected as 0.591 situation.In detection refrigeration
The temperature efficiency ε of underdosage threshold epsilonthIt is fixed in position (that is, the ε of Fig. 8 dotted lineth=0.6) in the case of, exist
The region Err1 (region of Fig. 8 solid line circle) of short of refrigerant is judged as although refrigerant amount is normal.
In contrast, in present embodiment 1, the temperature efficiency ε of short of refrigerant threshold epsilon can will be detectedthBecome
More it is less than the 1st a reference value (εmean- εSD) value (for example, 0.37), so can precision detect refrigerant amount well not
Foot.
Embodiment 2.
In embodiments of the present invention 2, the control unit 320 of refrigerant amount abnormal detector 300 is illustrated using Fig. 9
In refrigerant amount abnormality detection control process another example.
Fig. 9 is in the refrigerant amount abnormal detector 300 for represent present embodiment 2, control unit 320 control process
An example flow chart.For the processing shown in Fig. 9, in the same manner as the processing with Fig. 7 of above-mentioned embodiment 1, it is
By the temperature efficiency ε of supercooling heat exchanger 5 threshold epsilonthAppropriate value is adjusted to, in the operation process of refrigerating plant 100
In at least perform 1 time, or at least performed 1 time reducing when the operating conditions such as the situation of setting of evaporating temperature are changed.
Step S210 is the process for the temperature efficiency ε for calculating supercooling heat exchanger 5, the step of with above-mentioned embodiment 1
S110 is identical.
Step S220 is the threshold epsilon for judging temperature efficiency εthWhether than the 1st a reference value (εmean- εSD) big process, it is and upper
The step S120 for stating embodiment 1 is identical.In temperature efficiency ε threshold epsilonthIn the case of less than the 1st a reference value, step is entered
S232。
Step S230 is the threshold epsilon for being altered to temperature efficiency εthLess than the process of the 1st a reference value, with above-mentioned embodiment 1
Step S130 it is identical.
In step S232, in control unit 320, the threshold epsilon of the temperature efficiency ε after being changed in step S230 is judgedth
Whether the standard deviation ε for being the temperature efficiency ε calculated in step S210SD(after, it is referred to as " the 2nd a reference value ") below.
Temperature efficiency ε threshold epsilonthIn the case of more than 2nd a reference value, step S240 is entered.
It is being determined as temperature efficiency ε current threshold epsilonthFor the 2nd a reference value (εSD) below in the case of, in step
In S235, changing temperature efficiency ε current threshold epsilonth.In present embodiment 2, temperature efficiency ε threshold epsilonthIt is configured to
Less than the 1st a reference value (εmean- εSD) and more than the 2nd a reference value.
Step S240 is the currency ε for judging temperature efficiency εrealWhether temperature efficiency ε threshold epsilon is less thanthProcess, with
The step S140 of above-mentioned embodiment 1 is identical.
Step S250 is the not enough process for detecting the refrigerant amount in refrigerating plant 100, the step with above-mentioned embodiment 1
Rapid S150 is identical.
Step S260 is the normal process of the refrigerant amount being detected as in refrigerating plant 100, the step with above-mentioned embodiment 1
Rapid S160 is identical.
As described above, the refrigerant amount abnormal detector 300 of present embodiment 2 possesses control unit 320, the control
Portion 320 processed is by temperature efficiency ε threshold epsilonthFurther it is set smaller than the 1st a reference value (εmean- εSD) and more than the 2nd a reference value
(εSD).Illustrate the specific effect of present embodiment 2 using Figure 10.
Figure 10 is the effect of the invention in the refrigerant amount abnormal detector 300 for roughly represent present embodiment 2
Figure.The arrow of longitudinal direction represents that temperature efficiency ε, temperature efficiency ε become big towards the direction of arrow.The broken line d of solid line is roughly represented
The high average value ε of the possibility that can use as the temperature efficiency ε of stochastic variablemeanNumber range above.Along transverse direction
Arrow diagramming represent the threshold epsilon of temperature efficiency ε before changingthDotted line and represent the 2nd a reference value (SD) solid line.Edge
The chain-dotted line for the arrow diagramming of transverse direction is the threshold epsilon of the temperature efficiency ε after the change of present embodiment 2th, dotted line and chain-dotted line
Between white block arrow represent the threshold epsilon of present embodiment 2thChange.
Herein, it is considered to the feelings of temperature efficiency ε=0.857 ± 0.266 when the refrigerant amount in refrigerating plant 100 is normal
Condition.For example, in the short of refrigerant of refrigerating plant 100, degree of subcooling (examine by condensation temperature detected value TH5- supercooling temperature
Measured value TH8) be 0 in the case of, in Fig. 10, temperature efficiency ε be 0 ± 0.266.Therefore, though in this case, still with
Produce temperature efficiency ε currency ε machinerealIt is detected as 0.266 situation.In the temperature efficiency of detection short of refrigerant
ε threshold epsilonthIt is fixed in position (that is, the ε of Figure 10 dotted lineth=0.25) in the case of, although there is short of refrigerant
But it is judged as the normal region Err2 of refrigerant amount (region of Figure 10 solid line circle).
In contrast, in present embodiment 2, the temperature efficiency ε of short of refrigerant threshold epsilon can will be detectedthEnter
One step is set smaller than the 1st a reference value (εmean- εSD) and more than the 2nd a reference value (εSD) (for example, 0.37), so being capable of precision
The deficiency of refrigerant amount is detected well.
Other embodiment
The invention is not restricted to above-mentioned embodiment, a variety of deformations can be carried out.For example, in the above-described embodiment, explanation
1 heat source unit 10 connects the situation of 1 load unit 20, but the invention is not restricted to this, can also connect arbitrary quantity
Load unit 20.
In addition, in the above-described embodiment, illustrating that detection is filled in by the way that heat source unit 10 is connected with load unit 20
And the not enough situation of the refrigerant amount of the refrigerating circuit constituted, but refrigerating plant 100 in the present invention is not limited to this.Example
Such as, additionally it is possible to load unit 20 (indoor unit) and system using site layout project when installing at the scene are made as condensing unit
Cryogen pipe arrangement (liquid pipe, gas pipe) connects and constituted the refrigerating plant 100 of refrigerant loop (kind of refrigeration cycle).In addition,
Following refrigerating plant 100 can also be for example made as cooling unit：Possesses the pressure for constituting refrigerant loop in 1 unit
Contracting machine 1, heat source side heat exchanger 3, supercooling heat exchanger 5, decompressor 6, load-side heat exchanger 7 and other attached set
It is standby, connected using refrigerant piping.
In addition, the structure of the refrigerating plant 100 of above-mentioned embodiment is not limited to said structure.For example, it is also possible to make
Four-way valve of switching refrigerant flow path etc. is set and the structure of cooling operation and the conditioner of heating operation is allowed hand over.
Alternatively, it is also possible to make the structure of at least one being not provided with oil eliminator 2, liquid receiver 4, reservoir 8.
In addition, the condensation temperature detected value TH5 of the 1st temperature sensor 120 detection can also detect discharge pressure, it is scaled
Saturation temperature is calculated.Similarly, the evaporating temperature detected value ET of the 4th temperature sensor 180 detection can also detect suction
Enter pressure, be scaled saturation temperature to be calculated.
Symbol description
1：Compressor；2：Oil eliminator；2a：Oil return pipe；3：Heat source side heat exchanger；4：Liquid receiver；5：Supercooling
Heat exchanger；5a：Bimetallic tube supercooling heat exchanger；5b：Electric expansion valve；5c：Middle ascending pipe；6：Decompressor；7：It is negative
Carry side heat exchanger；8：Reservoir；9：Relay pipe arrangement；10：Heat source unit；20：Load unit；30：Liquid extends pipe arrangement；40：
Gas extends pipe arrangement；50：Compression unit；60a：1st extension pipe arrangement；60b：2nd extension pipe arrangement；60c：3rd extension pipe arrangement；60d：
4th extension pipe arrangement；100：Refrigerating plant；120：1st temperature sensor；140：2nd temperature sensor；160：3rd TEMP
Device；180：4th temperature sensor；300：Refrigerant amount abnormal detector；320：Control unit；340：Display part.
Claims (5)
1. a kind of refrigerant amount abnormal detector, wherein,
The refrigerant amount abnormal detector is connected with refrigerating plant, and the refrigerating plant possesses supercooling heat exchanger and conduct
The heat source side heat exchanger of condenser function,
The refrigerant amount abnormal detector possesses control unit, and the control unit is carried out according to using the heat source side heat exchanger
Standard deviation, the stream of the average value of extraneous gas temperature detection value before heat exchange and the extraneous gas temperature detection value
Cross the condensation temperature detected value of the refrigerant of the refrigerant piping of the outlet side of the heat source side heat exchanger average value and
The standard deviation of the condensation temperature detected value and flow through the supercooling heat exchanger outlet side refrigerant piping system
The standard deviation of the average value of the supercooling temperature detection value of cryogen and the supercooling temperature detection value, calculates the supercooling
But the average value and standard deviation of the temperature efficiency of heat exchanger,
Threshold value as the temperature efficiency of the index of detection short of refrigerant is set as than from described by the control unit
The average value of temperature efficiency is worth small value obtained from subtracting the standard deviation of the temperature efficiency,
In the case where the currency of the temperature efficiency is less than the threshold value, the control unit detects short of refrigerant.
2. refrigerant amount abnormal detector according to claim 1, wherein,
The threshold value of the temperature efficiency is set as bigger than the standard deviation of the temperature efficiency by the control unit.
3. a kind of refrigerant amount abnormal detector, wherein,
The refrigerant amount abnormal detector is connected with refrigerating plant, and the refrigerating plant possesses supercooling heat exchanger and conduct
The heat source side heat exchanger of condenser function,
The refrigerant amount abnormal detector possesses control unit, and the control unit is carried out according to using the heat source side heat exchanger
The currency of extraneous gas temperature detection value before heat exchange, flow through the heat source side heat exchanger outlet side refrigerant
The currency of the condensation temperature detected value of the refrigerant of pipe arrangement and flow through the supercooling heat exchanger outlet side refrigeration
The currency of the detected value of the supercooling temperature of the refrigerant of agent pipe arrangement, calculates the temperature efficiency of the supercooling heat exchanger
Currency,
It is less than the threshold value of the temperature efficiency of the index as detection short of refrigerant in the currency of the temperature efficiency
In the case of, the control unit detects short of refrigerant,
The threshold value is more than 0.350 and less than 0.550.
4. the refrigerant amount abnormal detector described in any one in claims 1 to 3, wherein,
The refrigerant amount abnormal detector is also equipped with display part, and display part report detects the short of refrigerant
Situation.
5. a kind of refrigerating plant, wherein,
The refrigerating plant possesses the refrigerant amount abnormal detector described in any one in Claims 1 to 4.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| PCT/JP2015/055880 WO2016135953A1 (en) | 2015-02-27 | 2015-02-27 | Detection apparatus for abnormalities in refrigerant amount, and refrigeration apparatus |
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| CN107777292A (en) * | 2017-10-10 | 2018-03-09 | 龙岩烟草工业有限责任公司 | Belted electronic balance operating state monitoring system, method and tobacco system of processing |
| CN111094877A (en) * | 2017-09-14 | 2020-05-01 | 三菱电机株式会社 | Refrigeration cycle device and refrigeration device |
Families Citing this family (1)
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| JP6641376B2 (en) * | 2015-08-21 | 2020-02-05 | 三菱電機株式会社 | Abnormality detection system, refrigeration cycle device, and abnormality detection method |
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Also Published As
| Publication number | Publication date |
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| JPWO2016135953A1 (en) | 2017-08-31 |
| JP6373475B2 (en) | 2018-08-15 |
| CN107208951B (en) | 2019-10-08 |
| WO2016135953A1 (en) | 2016-09-01 |
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