CN107208951B - Refrigeration dose abnormal detector and refrigerating plant - Google Patents
Refrigeration dose abnormal detector and refrigerating plant Download PDFInfo
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- CN107208951B CN107208951B CN201580072713.1A CN201580072713A CN107208951B CN 107208951 B CN107208951 B CN 107208951B CN 201580072713 A CN201580072713 A CN 201580072713A CN 107208951 B CN107208951 B CN 107208951B
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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
Abstract
Refrigeration dose abnormal detector (300) of the invention has control unit (320), and the control unit (320) is according to the average value TH6 of extraneous gas temperature detection value TH6meanAnd the standard deviation TH6 of extraneous gas temperature detection value TH6SD, condensation temperature detected value TH5 average value TH5meanAnd the standard deviation TH5 of condensation temperature detected value TH5SDAnd the average value TH8 of supercooling temperature detection value TH8meanAnd the standard deviation TH8 of supercooling temperature detection value TH8SD, calculate the average value ε of the temperature efficiency ε of supercooling heat exchanger 5meanWith standard deviation εSD, by the threshold epsilon as the temperature efficiency ε of the index of detection short of refrigerantthIt is set as than the average value ε from temperature efficiency εmeanSubtract the standard deviation ε of temperature efficiency εSDObtained from be worth small value, in the current value ε of temperature efficiency εrealLess than threshold epsilonthIn the case where detect short of refrigerant.
Description
Technical field
The present invention relates to refrigeration dose abnormal detector and refrigerating plants.
Background technique
As the method for the short of refrigerant in previous detection refrigerating plant, such as proposes 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
It offers 1).Insufficient technology (the example of refrigeration dose is detected in addition, proposing based on the degree of subcooling in the exit of subcooler
Such as, referring to patent document 2).
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 9-105567 bulletin
Patent document 2: Japanese Unexamined Patent Publication 2011-226704 bulletin
Summary of the invention
Subject to be solved by the invention
But in the method for utilizing temperature detection short of refrigerant as patent document 1,2, such as according to system
The difference of the operating condition of device for cooling, there are the detection accuracy of refrigeration dose to decline such problems.In addition, due to temperature sensing
The detection error of device, there is also abnormality detection accuracy decline such problems of refrigeration dose.
The present invention makes to solve the above-mentioned problems, and its purpose is to provide following refrigeration dose abnormality detection dresses
It sets and refrigerating plant:, can precision no matter the detection error of the operating condition of refrigerating plant and temperature sensor
The deficiency of refrigeration dose is detected well.
Means for solving the problems
Refrigeration dose abnormal detector of the invention is connect with refrigerating plant, which has supercooling heat exchange
Device and the heat source side heat exchanger functioned as condenser, the refrigeration dose abnormal detector have 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
The average value of the supercooling temperature detection value of the refrigerant of the refrigerant piping of the outlet side of cooling heat exchanger and the mistake
The standard deviation of cooling 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, which subtracts, is worth small value obtained from the standard deviation of the temperature efficiency, in the current value of the temperature efficiency
In the case where less than the threshold value, the control unit detects short of refrigerant.
Refrigeration dose abnormal detector of the invention is connect with refrigerating plant, which has supercooling heat exchange
Device and the heat source side heat exchanger functioned as condenser, according to using the heat source side heat exchanger carry out heat exchange it
The current value of preceding extraneous gas temperature detection value, flow through the heat source side heat exchanger outlet side refrigerant piping system
The current value of the condensation temperature detected value of cryogen and flow through the supercooling heat exchanger outlet side refrigerant piping
The current value of the detected value of the supercooling temperature of refrigerant calculates the current value 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 current value of the temperature efficiency
Under condition, the control unit detects short of refrigerant, and the threshold value is 0.350 or more and 0.550 or less.
Refrigerating plant of the invention has above-mentioned refrigeration dose abnormal detector.
The effect of invention
In accordance with the invention it is possible to provide following refrigeration dose abnormal detector and refrigerating plant: by will test system
The threshold value of the insufficient temperature efficiency of cryogen amount be changed to the standard deviation than subtracting temperature efficiency from the average value of temperature efficiency and
The small value of obtained value, so as to precisely detect the deficiency of refrigeration dose.
Detailed description of the invention
Fig. 1 is the refrigerant circuit that outlined an example of refrigerating plant 100 for embodiments of the present invention 1
Figure.
Fig. 2 is the refrigerant circuit that outlined another example of refrigerating plant 100 of embodiments of the present invention 1
Figure.
Fig. 3 is the refrigerant circuit that outlined the another example of refrigerating plant 100 of embodiments of the present invention 1
Figure.
Fig. 4 is the refrigerant circuit that outlined the another example of refrigerating plant 100 of embodiments of the present invention 1
Figure.
Fig. 5 be in the refrigerating plant 100 for outlined embodiments of the present invention 1, refrigeration dose be not with not
The figure of the temperature change of refrigerant in the case where foot.
The case where Fig. 6 is in the refrigerating plant 100 for outlined embodiments of the present invention 1, short of refrigerant
Under refrigerant temperature change figure.
Fig. 7 is the control of control unit 320 in the refrigeration dose abnormal detector 300 for indicate embodiments of the present invention 1
Make the flow chart of an example of processing.
Fig. 8 is of the invention in the refrigeration dose abnormal detector 300 for outlined embodiments of the present invention 1
The figure of effect.
Fig. 9 is the control of control unit 320 in the refrigeration dose abnormal detector 300 for indicate embodiments of the present invention 2
Make the flow chart of an example of processing.
Figure 10 is the present invention in the refrigeration dose abnormal detector 300 for outlined embodiments of the present invention 2
Effect figure.
Specific embodiment
Embodiment 1.
Using FIG. 1 to FIG. 3 to the refrigerating plant 100 and refrigeration dose abnormal detector of embodiments of the present invention 1
300 structure is illustrated.Fig. 1 is the refrigerant loop figure for indicating an example of refrigerating plant 100 for present embodiment 1.
In addition, in the following drawings including Fig. 1, the relationship of the size of each component parts and shape and actual size sometimes
Relationship and shape it is different.
The structure of the refrigerant circuit of the refrigerating plant 100 of present embodiment 1 is illustrated.
The refrigerating plant 100 of Fig. 1 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 liquid storage device 8 recycle
Circuit.
Compressor 1 is the fluid machinery of capacity variable type, compresses sucked low pressure refrigerant, is arranged as high-pressure refrigerant
Out.Compressor 1 is for example able to use scroll compressor, which utilizes Frequency Converter Control speed.
Oil eliminator 2 carries out separation removal to the refrigerator oil that the high-pressure refrigerant being discharged from compressor 1 is included, and reduces
The amount for the refrigerator oil that high-pressure refrigerant is included.Compressor 1 is returned to via oil return pipe 2a by the refrigerator oil of separation removal.
In Fig. 1, heat source side heat exchanger 3 is the heat exchanger functioned as condenser.Heat source side heat exchanger 3
Implement the high-pressure refrigerant being discharged from compressor 1 and extraneous gas (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
Heat source side heat exchanger releases heat with the extraneous gas that fan (not shown) is sent.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 cylindrical shape, and the container of the cylindrical shape can be according to condensation temperature, outside
The capacity of gas temperature or compressor 1 temporarily retains the raffinate system generated in the refrigerant circuit of refrigerating plant 100
Cryogen.Liquid receiver 4 is by temporarily retaining remaining liq refrigerant, to be adjusted according to the load of refrigerating plant 100
Flow through the refrigeration dose of the refrigerant circuit of refrigerating plant 100.
Supercooling heat exchanger 5 implements to lodge in the high pressure liquid refrigerant of liquid receiver 4 and the heat of extraneous gas is handed over
It changes.Using the heat exchange in supercooling heat exchanger 5, the high pressure liquid refrigerant for lodging in liquid receiver 4 becomes 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, also can be made other structures.
Decompressor 6 makes the high pressure liquid refrigerant expansion and decompression flowed out from supercooling heat exchanger 5.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, as decompressor 6, additionally it is possible to use capillary etc..
In Fig. 1, load-side heat exchanger 7 is the heat exchanger functioned as radiator (evaporator).Load-side
Heat exchanger 7 is following heat exchanger: implementing the refrigerant after depressurizing using decompressor 6 and air (for example, in refrigerating plant
100 is are room airs in the case where conditioner) heat exchange, utilize refrigerant cooling air.Load-side heat exchange
Device 7 for example can release heat with the extraneous gas that fan (not shown) is sent to by load-side heat exchanger.Load-side heat exchange
The fin that device 7 can for example be configured to cross-fin formula adds pipeline type heat exchanger, and the fin of the cross-fin formula adds pipeline type
Heat exchanger includes heat-transfer pipe and multiple fins.
Liquid storage device 8 includes refrigerant and retains function, retains remaining refrigerant；And gas-liquid separating function, by making
The liquid refrigerant temporarily generated when operating condition changes is detained, so that a large amount of liquid refrigerant be prevented to be flowed into pressure
Contracting machine 1.
The refrigerating plant 100 of Fig. 1 has heat source unit 10, load unit 20, liquid and extends piping 30 and gas extension
Piping 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 liquid storage device 8.Heat source unit 10 for example can the conduct in the case where refrigerating plant 100 is conditioner
Outdoor unit is set to 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 set to as indoor unit.
It 30 is following refrigerant piping that liquid, which extends piping: will be from the supercooling heat exchanger 5 for being contained in heat source unit 10
Outlet side extend refrigerant piping, with from the entrance side for the decompressor 6 for being contained in load unit 20 extend refrigerant
It is connected between piping.It is following refrigerant piping that gas, which extends piping 40: will be handed over from the load-side heat for being contained in load unit 20
The refrigerant piping and the refrigeration extended from the entrance side for the liquid storage device 8 for being contained in heat source unit 10 that the outlet side of parallel operation 7 extends
It is connected between agent piping.
In addition, the refrigerating plant 100 of present embodiment 1 also can have remote control type condensing unit, wherein 1 quilt of compressor
It is set to interior, heat source side heat exchanger 3 and supercooling heat exchanger 5 are arranged at outdoor.Using Fig. 2~Fig. 4, illustrate have
There is the example of the refrigerating plant 100 of remote control type condensing unit.
Fig. 2 is the refrigerant loop figure that outlined another example of refrigerating plant 100 of 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 liquid storage device 8 recycle returns
Road.
The refrigerating plant 100 of Fig. 2 has heat source unit 10, load unit 20, liquid and extends piping 30, gas extension piping
40, the extension of compression unit the 50, the 1st is piped 60a, the 2nd extension is piped 60b, the 3rd extension is piped the extension of 60c and the 4th and is piped 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, liquid storage device 8 and
Relaying piping 9.Compression unit 50 for example can be configured at interior in the case where refrigerating plant 100 is conditioner.It receives
The relaying piping for being dissolved in compression unit 50 9 is following refrigerant piping: for via compression unit 50 by heat source unit 10 and negative
Carrier unit 20 connects, and forms refrigerant circuit.
It 30 is following refrigerant piping that liquid, which extends piping: by be contained in compression unit 50 relaying piping 9, with from receiving
It is connected between the refrigerant piping that the entrance side of the decompressor 6 of load unit 20 extends.It is as follows that gas, which extends piping 40,
Refrigerant piping: by the refrigerant piping extended from the outlet side for the load-side heat exchanger 7 for being contained in load unit 20, with from
It is contained between the refrigerant piping of the entrance side extension of the liquid storage device 8 of heat source unit 10 and connects.
1st to extend piping 60a be following refrigerant piping: will be from the outlet for the oil eliminator 2 for being contained in compression unit 50
The refrigerant piping that side extends and the refrigerant extended from the entrance side for the heat source side heat exchanger 3 for being contained in heat source unit 10
It is connected between piping.2nd extension piping 60b is following refrigerant piping: will be handed over from the heat source side heat for being contained in heat source unit 10
Refrigerant piping that the outlet side of parallel operation 3 extends, with extend from the entrance side for the liquid receiver 4 for being contained in compression unit 50
It is connected between refrigerant piping.3rd to extend piping 60c be following refrigerant piping: will be from the liquid for being contained in compression unit 50
The refrigerant piping that the outlet side of receiver 4 extends and the entrance side from the supercooling heat exchanger 5 for being contained in heat source unit 10
It is connected between the refrigerant piping of extension.4th to extend piping 60d be 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 piping 9 for being contained in compression unit 50.
Fig. 3 is the refrigerant loop figure that outlined the another example of refrigerating plant 100 of present embodiment 1.Fig. 3's
Refrigerating plant 100 is accommodated in heat source unit 10, without the 2nd extension extension of piping 60b and the 3rd in addition to liquid receiver 4
It is piped except the point of 60c, is structure identical with the refrigerating plant 100 of Fig. 2.
Fig. 4 is the refrigerant loop figure that outlined the another example of refrigerating plant 100 of present embodiment 1.In Fig. 4
Refrigerating plant 100 in, the bimetallic tube supercooling heat exchanger 5a for carrying out intermediate injection to compressor 1 is accommodated in compression
Unit 50.As shown in figure 4, the supercooling heat exchanger 5 of present embodiment 1 is also possible to bimetallic tube supercooling heat exchanger 5a.
Bimetallic tube supercooling is connected to from branch's piping of the high pressure side outlet branch of bimetallic tube supercooling heat exchanger 5a
The low pressure side inlet of heat exchanger 5a.Be configured with electric expansion valve 5b in branch's piping, electric expansion valve 5b can it is multistage or
Person continuously adjusts aperture.The refrigerant piping and intermediate note being connect with the low side outlets of bimetallic tube supercooling heat exchanger 5a
Enter pipe 5c connection, refrigerant of the intermediate injection pipe 5c to the intermediate pressure section supply low pressure of compressor 1.The refrigerating plant 100 of Fig. 4
In addition to bimetallic tube supercooling heat exchanger 5a be accommodated in compression unit 50, as described above constitute intermediate this point of injecting mechanism and
Extend piping 60c and the 4th without the 3rd to extend except this point of piping 60d, is knot identical with the refrigerating plant 100 of Fig. 2
Structure.
Next, being illustrated to the sensor class for the refrigerating plant 100 for being configured at present embodiment 1.
The refrigerating plant 100 of present embodiment 1 has the 1st temperature sensor 120, the 2nd temperature sensor 140, the 3rd temperature
Sensor 160 and the 4th temperature sensor 180.
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 is matched
It is placed in the refrigerant piping for connecting the outlet side of supercooling heat exchanger 5 with the entrance side of decompressor 6, refrigeration is flowed through in detection
The temperature of the refrigerant of agent piping.3rd temperature sensor 160 is configured in the upper of the air stream for flowing 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 connecting 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 piping, detection.
As the 1st temperature sensor 120, the 2nd temperature sensor 140, the 3rd temperature sensor 160 and the 4th temperature sensing
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 identical
Material is constituted, and can also be made of different materials.
Next, being carried out to the refrigeration dose abnormal detector 300 that the refrigerating plant 100 with present embodiment 1 is connect
Explanation.
Refrigeration dose abnormal detector 300 has control unit 320 and display unit 340, and detection is filled in refrigerant circuit
Refrigeration dose exception, show testing result.By the 1st temperature sensor 120, the 2nd temperature sensor 140, the 3rd temperature sensing
The temperature information that device 160 and the 4th temperature sensor 180 detect is input into refrigeration dose abnormality detection dress as electric signal
Set 300.
In Fig. 1, refrigeration dose abnormal detector 300 is the structure connecting with heat source unit 10.In Fig. 2~Fig. 4,
Refrigeration dose abnormal detector 300 is the structure connecting with compression unit 50.The connection of refrigeration dose abnormal detector 300
Position is without being limited thereto, can also connect with load unit 20.Alternatively, it is also possible to by refrigeration dose abnormal detector 300 and system
Device for cooling 100 is integrally constituted.In addition, the control unit 320 of refrigeration dose abnormal detector 300 can also for example be filled with refrigeration
The control unit (not shown) for setting the frequency of 100 control compressor 1 is integrally constituted.
Control unit 320 has microcomputer, which has port CPU, ROM, RAM, I/O etc..Display unit
The testing result etc. of 340 display refrigeration doses, such as be made of 7 sections of LED etc..
The control unit 320 of present embodiment 1 is according to the extraneous gas carried out before heat exchange using heat source side heat exchanger 3
The standard deviation of the average value of temperature detection value and 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
The threshold value of the temperature efficiency of index as 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, to system in the case where the threshold value after the current value of temperature efficiency is less than change
Cold underdosage is detected.
Herein, to the average value ε of the temperature efficiency ε of the supercooling heat exchanger 5 calculated by control unit 320meanAnd mark
Quasi- deviation εSDIt is illustrated.In the following description, the temperature that will be detected by each temperature sensor (120,140,160,180)
It defines 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 as " condensation temperature detected value TH5 ".Due to point of the detected value of the 1st temperature sensor 120 itself
The discrete of 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.The average value of condensation temperature detected value TH5 is being set as TH5meanAnd by the standard of condensation temperature detected value TH5
Deviation is set as TH5SDIn the case where, TH5=TH5mean±TH5SDRelationship set up.In addition, working as condensation temperature detected value TH5
Preceding value is set as 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 as " supercooling temperature detection value TH8 ".Due to the detected value of the 2nd temperature sensor 140 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.The average value of supercooling temperature detection value TH8 is being set as TH8meanAnd by the mark of supercooling temperature detection value TH8
Quasi- deviation is set as TH8SDIn the case where, TH8=TH8mean±TH8SDRelationship set up.In addition, by supercooling temperature detection value TH8
Current value be set as TH8real。
The detected value for the extraneous gas temperature that 3rd temperature sensor 160 detects is set as " extraneous gas temperature detection value
TH6".The resistance value of discrete or control base board (not shown) of detected value due to the 3rd temperature sensor 160 itself etc. from
It dissipates, 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 as TH6meanAnd the standard deviation of extraneous gas temperature detection value TH6 is set as TH6SDIn the case where, TH6=
TH6mean±TH6SDRelationship set up.In addition, the current value of extraneous gas temperature detection value TH6 is set as TH6real。
The detected value of the temperature for the refrigerant for flowing through refrigerant piping that 4th temperature sensor 180 detects is set as steaming
Send out temperature detection value ET.Due to the electricity of the discrete or control base board (not shown) of the detected value of the 4th temperature sensor 180 itself
Resistance value 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 as ET6meanAnd the standard deviation of evaporating temperature detected value ET is set as ETSDIn the case where, ET=ETmean±ETSD
Relationship set up.In addition, the current value of evaporating temperature detected value ET is set as 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
It is (cold divided by the maximum temperature difference of supercooling heat exchanger 5 to spend (condensation temperature detected value TH5- supercooling temperature detection value TH8)
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 indicates the performance of supercooling heat exchanger 5, with degree of subcooling
It compares, the variation as caused by the operating condition of refrigerating plant 100 is small, so can be improved the judgement precision of short of refrigerant.
It is less than the threshold epsilon of predetermined temperature efficiency ε in the temperature efficiency ε of supercooling heat exchanger 5thIn the case where, to refrigerant
Amount deficiency is detected.
The current value ε for being temperature efficiency ε in the temperature efficiency ε of calculatingrealIn the case where, temperature efficiency εrealAccording to usual
Arithmetic, utilize formula (2)
[formula 2]
To calculate.For example, in the current value TH5 of condensation temperature detected value TH5realFor 43 DEG C, extraneous gas temperature detection
The current value TH6 of value TH6realFor 50 DEG C, the current value TH8 of supercooling temperature detection value TH8realIn the case where 44 DEG C, temperature
The current value ε of efficiency εrealFor (50-44)/(50-43)=0.857.
The case where temperature efficiency ε due to considering calculating is stochastic variable, the general stochastic variable X1 of consideration,
X2.Herein, the average value of stochastic variable X1 is set as X1mean, the standard deviation of stochastic variable X1 is set as X1SD.It in addition will be with
The average value of machine variable X 2 is set as X2mean, the standard deviation of stochastic variable X2 is set as X2SD。
Stochastic variable X1, X2 independently of each other according to normal distribution in the case where, 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, consider
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
The case where being 44 ± 1 DEG C.For the value of the molecule TH5-TH8 of formula (1), when X1 is set as TH5 in formula (3), X2 is set
When for TH8, become formula (5).
[formula 5]
For the value of the denominator TH5-TH6 of formula (1), when X1 is set as TH5 in formula (3), when X2 is set as TH6,
Become formula (6).
[formula 6]
Therefore, for the temperature efficiency ε of supercooling heat exchanger 5, when X1 is set as TH5-TH8 in formula (4),
When X2 is set as TH5-TH6, become formula (7).
[formula 7]
In this case, the average value ε of the temperature efficiency ε of supercooling heat exchanger 5meanIt is 0.857, supercooling heat exchange
The standard deviation ε of the temperature efficiency ε of device 5SDIt is 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) be 0 in the case where temperature efficiency ε be presumed to ε=0.000 ± 0.266.
The standard deviation ε of temperature efficiency ε more than considerationSD, for example by the threshold epsilon of temperature efficiency εthIt is set as εth=0.37,
It is detected as short of refrigerant less than 0.37, it is normal to be detected as refrigeration dose in the case where 0.37 or more, from
And it can precisely detect the deficiency of refrigeration dose.Threshold epsilonthBy being set as 0.350≤εth≤ 0.55 range below,
Thus and εth=0.37 the case where, similarly, can precisely detect the deficiency of refrigeration dose.In addition it is also possible to 0.37
It is detected as short of refrigerant in situation below, it is normal to be detected as refrigeration dose more than 0.37.
Next, the refrigerant circuit using Fig. 1 is illustrated the movement of the refrigerating plant 100 of present embodiment 1.
The gas refrigerant for the high temperature and pressure being discharged from compressor 1 is in the freezing for being included by refrigerant by oil eliminator 2
After machine oil separation, the heat source side heat exchanger 3 that Xiang Zuowei condenser functions is flowed into.It is flowed into heat source side heat exchanger 3
The gas refrigerant of high temperature and pressure heat is released by medium to low temperature such as outdoor airs, thus by heat exchange, a part or
Person integrally condenses, and becomes 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, thus the liquid further by heat exchange, after becoming supercooling
Refrigerant.Liquid refrigerant after being over cooled 5 supercooling of heat exchanger is flowed into decompressor 6, is inflated and is depressurized, becomes
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
The load-side heat exchanger 7 that hair device functions.The gas-liquid two-phase refrigerant of load-side heat exchanger 7 is flowed into room air
Cooling (heat absorption) is carried out, evaporates and becomes the gas refrigerant of low-temp low-pressure or the gas-liquid two-phase refrigerant that aridity is high.Gas
Cryogen or the high gas-liquid two-phase refrigerant of aridity are being removed liquid phase from load-side heat exchanger 7 via liquid storage device 8
After ingredient, it is inhaled into compressor 1.The gas refrigerant for being drawn into compressor 1 is compressed, and the gas system of high temperature and pressure is become
Cryogen is discharged from compressor 1.In the refrigerating plant 100 of Fig. 1, repeat above circulation.
Next, using Fig. 5 and Fig. 6 to the relationship of refrigerant charge and degree of subcooling in refrigerating plant 100 into
Row explanation.
Fig. 5 be it is in the refrigerating plant 100 for outlined present embodiment 1, refrigeration dose was not and insufficient feelings
The figure of the temperature change of refrigerant under condition.In Fig. 4, longitudinal arrow indicates temperature, gets higher towards arrow direction temperature.It is horizontal
To arrow indicate refrigerating plant 100 the flowing along refrigerant refrigerant path.Region A outlined supercooling heat
The refrigerant path of the refrigerant piping (liquid pipe) of the outlet side of exchanger 5.Region B outlined supercooling heat exchanger 5
Refrigerant path.Region C outlined the refrigerant path of the heat source side heat exchanger 3 functioned as condenser.
Solid line a with the arrow outlined refrigeration dose not and be the temperature change with the refrigerant in insufficient situation.Symbol D table
Showing refrigeration dose not was and the degree of subcooling in the supercooling heat exchanger 5 in insufficient situation.Region E indicates refrigeration dose
It was not and the two-phase region in insufficient situation.Region F indicates that refrigeration dose was not and the supercooling in insufficient situation
Region.
It was not to come from the two-phase system cryogen of heat source side heat exchanger 3 (region C) in insufficient situation in refrigeration dose
(region E) is by 4 gas-liquid separation of liquid receiver.Liquid receiver 4 has retained liquid refrigerant, becomes being saturated liquid status.Become
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, flows from supercooling heat exchanger 5
Refrigerant piping (region A) is arrived out.
Fig. 7 is system in the refrigerating plant 100 for outlined present embodiment 1, in the case where short of refrigerant
The figure of the temperature change of cryogen.In Fig. 7, also in the same manner as Fig. 5, longitudinal arrow indicates temperature, towards arrow direction temperature
It gets higher.Lateral arrow indicates the refrigerant path of the flowing along refrigerant of refrigerating plant 100.Region A outlined
The refrigerant path of the refrigerant piping (liquid pipe) of the outlet side of supercooling heat exchanger 5.Region B outlined supercooling heat
The refrigerant path of exchanger 5.Region C outlined the refrigeration of the heat source side heat exchanger 3 functioned as condenser
Agent path.
The temperature of refrigerant in the case that solid line b with the arrow outlined short of refrigerant in Fig. 7 becomes
Change.Dotted line a1 with the arrow outlined refrigeration dose not and be the temperature change with the refrigerant in insufficient situation, with
The solid line with the arrow of Fig. 5 is identical.The supercooling in supercooling heat exchanger 5 in the case where symbol D1 expression short of refrigerant
But it spends.Region E1 indicates the two-phase region in the case where short of refrigerant.In the case that region F1 indicates short of refrigerant
Supercooling region.Region G indicates the condenser zone generated in the case where short of refrigerant.
In the case where short of refrigerant, the two-phase system cryogen and system of the outlet side of heat source side heat exchanger 3 (region C)
It is the high state (region E1) of aridity that cryogen amount, which was not compared with insufficient situation,.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 refrigeration dose
In insufficient situation, generate in supercooling heat exchanger 5 (region B) due to heat exchange and two-phase system cryogen is condensed liquefied area
Domain (region G).After two-phase system cryogen is condensed liquefaction, liquid refrigerant is over cooled (region F1), hands over from supercooling heat
Parallel operation 5 flows out to refrigerant piping (region A).Therefore, the short of refrigerant the case where (under solid line b), not with refrigeration dose
It was compared with insufficient situation (dotted line a1), degree of subcooling reduces (symbol D1).
The refrigeration dose abnormal detector 300 of present embodiment 1 uses compared with degree of subcooling by refrigerating plant 100
Equable supercooling heat exchanger caused by operating condition (such as variation, variation of evaporating temperature of extraneous gas temperature etc.)
5 temperature efficiency ε detects the deficiency of refrigeration dose.Next, illustrating that the refrigeration dose of present embodiment 1 is different using Fig. 7
One example of the control processing of the refrigeration dose abnormality detection in the control unit 320 of normal detection device 300.
Fig. 7 is in the refrigeration dose abnormal detector 300 for indicate present embodiment 1, control unit 320 control processing
An example flow chart.For processing shown in Fig. 7, in order to by the threshold of the temperature efficiency ε of supercooling heat exchanger 5
Value εthIt is adjusted to value appropriate, is at least executed in the operation process of refrigerating plant 100 1 time, or is reducing evaporating temperature
Setting the case where etc. operating conditions at least execute 1 time when being changed.
It in present embodiment 1, is set as control unit 320 and has storage device, be stored with current supercooling heat exchanger 5
Temperature efficiency ε threshold epsilonth.In addition, being stored with temperature information in the storage device of control unit 320, which is
It 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).It calculates
Temperature efficiency ε be stochastic variable according to normal distribution, temperature efficiency ε=εmean±εSD。
In the step s 120, in control unit 320, determine the threshold epsilon of temperature efficiency εthWhether than the 1st a reference value
(εmean- εSD) greatly, the 1st a reference value (εmean- εSD) it is average value from calculated temperature efficiency ε in step s 110
εmeanSubtract the standard deviation ε of temperature efficiency εSDObtained from.In the threshold epsilon of temperature efficiency εthThe case where less than 1 a reference value
Under, enter step S140.
In the current threshold epsilon for being determined as temperature efficiency εthFor the 1st a reference value (εmean- εSD) more than in the case where, in step
In rapid S130, the current threshold epsilon of changing temperature efficiency εth.In present embodiment 1, the threshold epsilon of temperature efficiency εthIt is set
At less than the 1st a reference value.
In step S140, control unit 320 is based on above-mentioned formula (2), calculates the current value ε of temperature efficiency εreal, controlling
In portion 320, the current value ε of temperature efficiency ε is determinedrealWhether the threshold epsilon of temperature efficiency ε is less thanth。
In the current value ε of temperature efficiency εrealLess than the threshold epsilon of temperature efficiency εthIn the case where, in step S150, control
Detect the deficiency of the refrigeration dose in refrigerating plant 100 in portion 320 processed.
In the current value ε of temperature efficiency εrealFor the threshold epsilon of temperature efficiency εthIn the case where above, in step S160,
The refrigeration dose 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 of the meaning of short of refrigerant and refrigeration dose
It reports to display unit 340.Above- mentioned information can for example utilize the report of the error code based on 7 sections of LED or lighting for LED light
Or the report such as flashing.Above- mentioned information can also for example be reported in the control base board of refrigerating plant 100, also can use buzzing
The report such as device, sound.
As described above, the refrigeration dose abnormal detector 300 of present embodiment 1 has control unit 320, the control
Portion 320 processed by as detection short of refrigerant index temperature efficiency ε threshold epsilonthIt is set as than putting down from temperature efficiency ε
Mean value εmeanSubtract the standard deviation ε of temperature efficiency εSDObtained from be worth small value.
In refrigerating plant 100, the mistake that refrigeration dose has occurred in insufficient situation, cause generate refrigerating plant
A problem that 100 ability decline and the structural device of refrigerating plant 100 damage.Refrigerating plant 100 is not in order to prevent
The generation of good situation, in previous refrigerating plant, have determine be filled in refrigerating plant refrigeration dose mistake with it is insufficient
Function.
In the refrigerating plant for not having the mistake and insufficient function that determine refrigeration dose, as long as being deposited in liquid receiver
In residual refrigerant, then the operating of refrigerating plant is not affected refrigerant leaks.Therefore, refrigerant is having occurred
In the case where leakage, the also only liquid level decline of residual refrigerant, existing can not be detected until the residual refrigerant disappears
Refrigerant leaks such problems.
To solve the above-mentioned problems, it in previous refrigerating plant, provides using temperature efficiency detection refrigerant not
The refrigerating plant of foot.In the detection carried out using temperature efficiency, in the operating condition that external gas temperature is high, evaporating temperature is low
Under refrigerating plant operating when, the degree of subcooling (condensation temperature and supercooling temperature difference) and supercooling heat of refrigerant are handed over
Which of maximum temperature difference (condensation temperature and extraneous gas temperature difference) in parallel operation is all small value.Accordingly, there exist
Temperature sensor becomes larger relative to the error influence of temperature efficiency, it is difficult to carry out detection such problems using temperature efficiency.Cause
This exists under the operating condition that external gas temperature is high, evaporating temperature is low and is detected as freezing although refrigeration dose is normal
Underdosage, on the contrary, although short of refrigerant but being detected as the normal such problems of refrigeration dose.
But according to the present embodiment 1, the threshold epsilon of the temperature efficiency ε by will test short of refrigerantthIt is changed to
Than the average value ε from temperature efficiency εmeanSubtract the standard deviation ε of temperature efficiency εSDObtained from be worth small value, so as to essence
Degree detects the deficiency of refrigeration dose well.Illustrate the specific effect of present embodiment 1 using Fig. 8.
Fig. 8 is the effect of the invention in the refrigeration dose abnormal detector 300 for outlined present embodiment 1
Figure.Longitudinal arrow indicates that temperature efficiency ε, temperature efficiency ε become larger towards arrow direction.The broken line c of solid line outlined work
For stochastic variable temperature efficiency ε can using a possibility that high average value εmeanNumberical range below.Along transverse direction
Arrow diagramming indicates the threshold epsilon of temperature efficiency ε before changingthDotted line and indicate the 1st a reference value (εmean- εSD) reality
Line.Chain-dotted line along lateral arrow diagramming is the threshold epsilon of the temperature efficiency ε after the change of present embodiment 1th, dotted line with
The block arrow of white between chain-dotted line indicates the threshold epsilon of present embodiment 1thChange.
Herein, it is contemplated that the refrigeration dose in refrigerating plant 100 is normal, the case where temperature efficiency ε=0.857 ± 0.266.
In this case, the current value ε of temperature efficiency ε is randomly generatedrealThe case where being detected as 0.591.Freeze in detection
The threshold epsilon of the temperature efficiency ε of underdosagethThe position of the dotted line of Fig. 8 is fixed in (that is, εth=0.6) in the case where, exist
The region Err1 (region of the solid line circle of Fig. 8) of short of refrigerant is judged as although refrigeration dose is normal.
In contrast, the threshold epsilon of the temperature efficiency ε of short of refrigerant can be will test in present embodiment 1thBecome
More less than the 1st a reference value (εmean- εSD) value (for example, 0.37), so refrigeration dose can precisely be detected not
Foot.
Embodiment 2.
In embodiments of the present invention 2, the control unit 320 of refrigeration dose abnormal detector 300 is illustrated using Fig. 9
In refrigeration dose abnormality detection control processing another example.
Fig. 9 is in the refrigeration dose abnormal detector 300 for indicate present embodiment 2, control unit 320 control processing
An example flow chart.For processing shown in Fig. 9, in the same manner as the processing of Fig. 7 of above embodiment 1, it is
By the threshold epsilon of the temperature efficiency ε of supercooling heat exchanger 5thIt is adjusted to value appropriate, in the operation process of refrigerating plant 100
In at least execute 1 time, or when operating conditions are changed the setting for reducing evaporating temperature the case where etc., at least executes 1 time.
Step S210 is the process for calculating the temperature efficiency ε of supercooling heat exchanger 5, the step of with above embodiment 1
S110 is identical.
Step S220 is the threshold epsilon for determining temperature efficiency εthWhether than the 1st a reference value (εmean- εSD) big process, and it is upper
The step S120 for stating embodiment 1 is identical.In the threshold epsilon of temperature efficiency εthIn the case where 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 embodiment 1
Step S130 it is identical.
In step S232, in control unit 320, the threshold epsilon of the temperature efficiency ε after changing in step S230 is determinedth
Whether the standard deviation ε for being the calculated temperature efficiency ε in step S210SD(after, referred to as " the 2nd a reference value ") below.?
The threshold epsilon of temperature efficiency εthIn the case where more than 2nd a reference value, step S240 is entered.
In the current threshold epsilon for being determined as temperature efficiency εthFor the 2nd a reference value (εSD) in situation below, in step
In S235, the current threshold epsilon of changing temperature efficiency εth.In present embodiment 2, the threshold epsilon of temperature efficiency εthIt is configured to
Less than the 1st a reference value (εmean- εSD) and be greater than the 2nd a reference value.
Step S240 is the current value ε for determining temperature efficiency εrealWhether the threshold epsilon of temperature efficiency ε is less thanthProcess, with
The step S140 of above embodiment 1 is identical.
Step S250 is the insufficient process for detecting the refrigeration dose in refrigerating plant 100, the step with above embodiment 1
Rapid S150 is identical.
Step S260 is the normal process of refrigeration dose being detected as in refrigerating plant 100, the step with above embodiment 1
Rapid S160 is identical.
As described above, the refrigeration dose abnormal detector 300 of present embodiment 2 has control unit 320, the control
Portion 320 processed is by the threshold epsilon of temperature efficiency εthFurther it is set smaller than the 1st a reference value (εmean- εSD) and be greater 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 refrigeration dose abnormal detector 300 for outlined present embodiment 2
Figure.Longitudinal arrow indicates that temperature efficiency ε, temperature efficiency ε become larger towards arrow direction.The broken line d of solid line outlined
The high average value ε of a possibility that temperature efficiency ε as stochastic variable can be usedmeanAbove numberical range.Along transverse direction
Arrow diagramming indicate the threshold epsilon of temperature efficiency ε before changingthDotted line and indicate the 2nd a reference value (SD) solid line.Edge
Lateral arrow diagramming chain-dotted line be present embodiment 2 change after temperature efficiency ε threshold epsilonth, dotted line and chain-dotted line
Between white block arrow indicate present embodiment 2 threshold epsilonthChange.
Herein, the feelings of temperature efficiency ε=0.857 ± 0.266 when refrigeration dose of the consideration in refrigerating plant 100 is normal
Condition.For example, in the short of refrigerant of refrigerating plant 100, degree of subcooling (condensation temperature detected value TH5- supercooling temperature inspection
Measured value TH8) be 0 in the case where, in Figure 10, temperature efficiency ε be 0 ± 0.266.Therefore, though in this case, still with
Generate to machine the current value ε of temperature efficiency εrealThe case where being detected as 0.266.In the temperature efficiency of detection short of refrigerant
The threshold epsilon of εthThe position of the dotted line of Figure 10 is fixed in (that is, εth=0.25) in the case where, although there is short of refrigerant
But it is judged as the normal region Err2 of refrigeration dose (region of the solid line circle of Figure 10).
In contrast, the threshold epsilon of the temperature efficiency ε of short of refrigerant can be will test in present embodiment 2thInto
One step is set smaller than the 1st a reference value (εmean- εSD) and be greater than the 2nd a reference value (εSD) (for example, 0.37), so being capable of precision
The deficiency of refrigeration dose is detected well.
Other embodiment
The present invention is not limited to the above embodiments, is able to carry out various deformations.For example, in the above-described embodiment, explanation
The case where 1 heat source unit 10 connects 1 load unit 20, however, the present invention is not limited thereto also can 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 to be connect with load unit 20
And the insufficient situation of the refrigeration dose of the refrigerating circuit constituted, but the refrigerating plant 100 in the present invention is not limited to this.Example
Such as, additionally it is possible to be made into as condensing unit and utilize the load unit 20 (indoor unit) of site layout project and system when installing at the scene
Cryogen pipe arrangement (liquid pipe, gas pipe) connects and constitutes the refrigerating plant 100 of refrigerant circuit (refrigeration cycle).In addition,
Such as it can also be made into following refrigerating plant 100 as cooling unit: have the pressure for constituting refrigerant circuit in 1 unit
It contracting machine 1, heat source side heat exchanger 3, supercooling heat exchanger 5, decompressor 6, load-side heat exchanger 7 and other attached sets
It is standby, it is connected using refrigerant piping.
In addition, the structure of the refrigerating plant 100 of above embodiment is not limited to above structure.For example, it is also possible to be made into
Four-way valve of switching refrigerant flow path etc. is set and allows hand over the structure of the conditioner of refrigeration operation and heating operation.
Alternatively, it is also possible to be made into the structure for being not provided with oil eliminator 2, liquid receiver 4, at least one in liquid storage device 8.
In addition, the condensation temperature detected value TH5 of the 1st temperature sensor 120 detection also can detecte discharge pressure, it is scaled
Saturation temperature is calculated.Similarly, the evaporating temperature detected value ET of the 4th temperature sensor 180 detection also can detecte suction
Enter pressure, is 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: intermediate injection pipe；6: decompressor；7: negative
Carry side heat exchanger；8: liquid storage device；9: relaying piping；10: heat source unit；20: load unit；30: liquid extends piping；40:
Gas extends piping；50: compression unit；60a: the 1 extends piping；60b: the 2 extends piping；60c: the 3 extends piping；60d:
4th extends piping；100: refrigerating plant；120: the 1 temperature sensors；140: the 2 temperature sensors；160: the 3 temperature sensing
Device；180: the 4 temperature sensors；300: refrigeration dose abnormal detector；320: control unit；340: display unit.
Claims (6)
1. a kind of refrigeration dose abnormal detector, wherein
The refrigeration dose abnormal detector is connect with refrigerating plant, which has supercooling heat exchanger and conduct
The heat source side heat exchanger that condenser functions,
The refrigeration dose abnormal detector has control unit, which is carried out according to using the heat source side heat exchanger
The standard deviation of the average value of extraneous gas temperature detection value before heat exchange and the extraneous gas temperature detection value, stream
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, which subtracts, is worth small value obtained from the standard deviation of the temperature efficiency,
In the case where the current value of the temperature efficiency is less than the threshold value, the control unit detects short of refrigerant,
The temperature efficiency is the degree of subcooling by the refrigerant in the exit of the supercooling heat exchanger divided by the supercooling
But it is worth obtained from the maximum temperature difference of heat exchanger.
2. refrigeration dose 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. refrigeration dose abnormal detector according to claim 1 or 2, wherein
The threshold value is 0.350 or more and 0.550 or less.
4. refrigeration dose abnormal detector according to claim 1 or 2, wherein
The refrigeration dose abnormal detector is also equipped with display unit, and display unit report detects the short of refrigerant
Situation.
5. refrigeration dose abnormal detector according to claim 3, wherein
The refrigeration dose abnormal detector is also equipped with display unit, and display unit report detects the short of refrigerant
Situation.
6. a kind of refrigerating plant, wherein
The refrigerating plant has refrigeration dose abnormal detector described in any one in Claims 1 to 5.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN107208951A CN107208951A (en) | 2017-09-26 |
| CN107208951B true CN107208951B (en) | 2019-10-08 |
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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 |
| US11656015B2 (en) * | 2017-09-14 | 2023-05-23 | Mitsubishi Electric Corporation | Refrigeration cycle apparatus and refrigeration apparatus |
| CN107777292B (en) * | 2017-10-10 | 2020-05-12 | 龙岩烟草工业有限责任公司 | System and method for monitoring running state of electronic belt scale and tobacco processing system |
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| CN1965203A (en) * | 2004-06-11 | 2007-05-16 | 大金工业株式会社 | Air conditioner |
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| JPH0755300A (en) * | 1993-08-06 | 1995-03-03 | Yamaha Motor Co Ltd | Operation managing method for heat pump-type air-conditioning device |
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| ES2510665T3 (en) * | 2005-02-24 | 2014-10-21 | Mitsubishi Electric Corporation | Air conditioning system |
| WO2007049372A1 (en) * | 2005-10-25 | 2007-05-03 | Mitsubishi Electric Corporation | Air-conditioning apparatus, method of refrigerant filling in air-conditioning apparatus, method of judging state of refrigerant filling in air-conditioning apparatus, and method of refrigerant filling/piping cleaning for air-conditioning apparatus |
| JP4864110B2 (en) * | 2009-03-25 | 2012-02-01 | 三菱電機株式会社 | Refrigeration air conditioner |
| JP5036790B2 (en) * | 2009-11-16 | 2012-09-26 | 三菱電機株式会社 | Air conditioner |
| JP5334909B2 (en) * | 2010-04-20 | 2013-11-06 | 三菱電機株式会社 | Refrigeration air conditioner and refrigeration air conditioning system |
| JP5674452B2 (en) * | 2010-12-22 | 2015-02-25 | 三菱電機株式会社 | Refrigeration equipment |
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2015
- 2015-02-27 JP JP2017501799A patent/JP6373475B2/en active Active
- 2015-02-27 CN CN201580072713.1A patent/CN107208951B/en active Active
- 2015-02-27 WO PCT/JP2015/055880 patent/WO2016135953A1/en active Application Filing
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|---|---|---|---|---|
| CN1201887A (en) * | 1997-06-06 | 1998-12-16 | 运载器有限公司 | System for monitoring expansion valve |
| CN1965203A (en) * | 2004-06-11 | 2007-05-16 | 大金工业株式会社 | Air conditioner |
| CN101331372A (en) * | 2005-12-16 | 2008-12-24 | 大金工业株式会社 | Air conditioner |
| CN104321597A (en) * | 2012-05-23 | 2015-01-28 | 大金工业株式会社 | Freezer |
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| JP6373475B2 (en) | 2018-08-15 |
| CN107208951A (en) | 2017-09-26 |
| WO2016135953A1 (en) | 2016-09-01 |
| JPWO2016135953A1 (en) | 2017-08-31 |
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