CN105874289B - Method for the cold-producing medium supply based on Temperature Measure Control to evaporator - Google Patents
Method for the cold-producing medium supply based on Temperature Measure Control to evaporator Download PDFInfo
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- CN105874289B CN105874289B CN201480072306.6A CN201480072306A CN105874289B CN 105874289 B CN105874289 B CN 105874289B CN 201480072306 A CN201480072306 A CN 201480072306A CN 105874289 B CN105874289 B CN 105874289B
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000003507 refrigerant Substances 0.000 claims abstract description 90
- 230000006835 compression Effects 0.000 claims abstract description 34
- 238000007906 compression Methods 0.000 claims abstract description 34
- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- 230000008859 change Effects 0.000 claims description 31
- 238000010025 steaming Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 abstract description 29
- 238000005057 refrigeration Methods 0.000 abstract description 7
- 238000004378 air conditioning Methods 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 description 15
- 238000001704 evaporation Methods 0.000 description 14
- 230000008020 evaporation Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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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
-
- 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
- F25B2500/00—Problems to be solved
- F25B2500/19—Calculation of parameters
-
- 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
- F25B2500/00—Problems to be solved
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
-
- 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
- F25B2600/00—Control issues
- F25B2600/21—Refrigerant outlet evaporator temperature
-
- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
A kind of method of the cold-producing medium supply for an evaporator (2) for being used to control to a vapor compression system (1) of such as a refrigeration system, an air-conditioning system or a heat pump is disclosed herein.An air themperature T based on the air for flowing through the evaporator (2)AirAnd in order to reach a reference air temperature TAir, referenceTo control the opening degree of the expansion valve (3).The opening degree is set to calculated opening degree, it is overlapping with a disturbing signal.One temperature signal S of monitoring and analysis2, the temperature signal represent leave the evaporator (2) refrigerant temperature.In the case where the analysis discloses an arid region one minimum length of positive convergence of the evaporator (2), reduce the opening degree of the expansion valve (3).This provides a release mechanism, which ensures to prevent liquid refrigerant from passing through the evaporator (2).
Description
Invention field
It is (all for controlling to an evaporator, specifically arriving one vapor compression system of formation the present invention relates to one kind
Such as refrigeration system, air-conditioning system or heat pump) part an evaporator cold-producing medium supply method.According to the present invention
Method, the cold-producing medium supply to evaporator can control in the following manner：There is provided in the volume that one has freezed or heated
One desirable target temperature, while prevent liquid refrigerant from entering aspiration line, and it is based only on temperature survey.
Background of invention
Vapor compression system (such as refrigeration system, air-conditioning system or heat pump) generally includes at least one compressor, extremely
A few condenser, at least one expansion gear (such as in the form of expansion valve) and along a refrigerant path arrangement
At least one evaporator.Refrigerant circulates in refrigerant path and is alternately expanded and compressed, and in these condensations
Heat exchange occurs in device and these evaporators.Expanded refrigerant is entered with the mixed state of gaseous refrigerant and liquid refrigerant
In these evaporators.When refrigerant passes through these evaporators, the refrigerant with a second fluid across each evaporator
Evaporated when flowing (such as air stream) heat-shift.The potential refrigerating capacity of a given evaporator is utilized for maximum magnitude,
All there are liquid refrigerant for the whole length for wishing along the evaporator.On the other hand, it is undesirable to which liquid refrigerant passes through evaporation
Device simultaneously enters aspiration line, because if liquid refrigerant reaches compressor and may then damage these compressors.It is desirable to control
The cold-producing medium supply of these evaporators is made, its mode is causes in a given evaporator, mixed phase refrigerant and gaseous state
Border between refrigerant is just in the exit of the evaporator.
In order to obtain this point, the degree of superheat of the refrigerant of these evaporators is left in usually measurement and/or calculating.The degree of superheat
It is the temperature for the refrigerant for leaving the evaporator and leaves the difference of the dew point of the refrigerant of the evaporator.Therefore, a low overheat
Angle value instruction leaves the temperature of the refrigerant of the evaporator close to the dew point, and the evaporator is left in the instruction of one high super heat value
The temperature of refrigerant be significantly higher than the dew point, and indicate a sizable part for the evaporator therefore include gaseous refrigerant
Agent.In the part that the evaporator includes gaseous refrigerant device, between surrounding environment and the refrigerant flowed in the evaporator
Heat transfer is substantially less than the heat transfer in the part for the mixture that the evaporator includes gaseous refrigerant and liquid refrigerant.Cause
This, the gross efficiency of the evaporator can be reduced when a sizable part for the evaporator includes gaseous refrigerant.Subsequently attempt to
The cold-producing medium supply of the evaporator is controlled, its mode is so that the super heat value is maintained at a small and positive level.
In order to be obtained off the super heat value of the refrigerant of the evaporator, the refrigerant of the evaporator is left in normally measurement
Temperature and pressure.Required pressure sensor introduces the pressure sensor and comes off or the risk of failure in this case,
So that the super heat value can not possibly be measured, untill repairing the pressure sensor.In addition, the pressure sensor introduces
The risk leaked in the system.
2012/052019 A1 of WO describe a kind of method for being used to control to the cold-producing medium supply of an evaporator, its
Middle SH=0 points can be based purely on a temperature signal measured to determine.Activate a component, such as one expansion
Valve, a fan or a compressor, its mode is so that an arid region of the evaporator changes.Measurement and analytical table
Show a temperature signal of the temperature for the refrigerant for leaving the evaporator, such as including obtaining a rate of change signal.Then
A temperature value is determined, wherein the gain of a transmission function between the component and measured temperature signal that are activated is from one
A maximum drops to a minimum value.Identified temperature value is defined as corresponding to zero super heat value (SH=0).
Invention description
One purpose of various embodiments of the present invention is to provide a kind of cold-producing medium supply for being used to control to an evaporator
Method, wherein it is predetermined to provide one in the volume having freezed or heated at one normally to control the cold-producing medium supply
The target temperature of justice, while a release mechanism prevents liquid refrigerant from reaching compressor.
Another purpose of various embodiments of the present invention is to provide a kind of for being controlled in a temperature-fall period to one
The method of the cold-producing medium supply of evaporator, wherein it is ensured that a fast cooling, while prevent liquid refrigerant from reaching compressor.
According in a first aspect, the present invention provides a kind of system for being used to control to an evaporator of a vapor compression system
The method of cryogen supply, the vapor compression system include at least one evaporator, at least one compressor, at least one condensation
Device and at least one expansion valve being arranged in a refrigerant loop, this method comprise the following steps：
- acquisition flows through a temperature T of the air of evaporatorAir,
- based on the temperature T obtainedAirAnd in order to reach the air for flowing through the evaporator reference air
Temperature TAir, referenceAnd the opening degree of expansion valve is controlled,
- disturbing signal is provided, and the opening degree of the expansion valve is set to controlled opening degree, disturbed with this
Dynamic signal overlap,
One temperature signal S of-monitoring2, the temperature signal represent leave the evaporator refrigerant temperature,
- analysis temperature signal S2, and
- in the case where the analysis discloses an arid region one minimum length of positive convergence of the evaporator, reduce
The opening degree of the expansion valve.
In the context of this article, term " vapor compression system " should be interpreted to mean following any system：Wherein
A kind of flow of fluid medium (such as refrigerant) is circulated and is alternately compressed and expands, and thus provides the refrigeration to certain volume
Or heating.Therefore, which can be a refrigeration system, an air-conditioning system, heat pump etc..
The vapor compression system includes at least one evaporator, at least one compressor, at least one condenser, Yi Jizhi
A few expansion valve.Therefore, which can be only including one in these every kind of components, or this is steam compressed
System can include two or more in these any components.For example, the vapor compression system can include single compression
Machine, or it can include for example being arranged at two or more compressors in a Compressor Group.Similarly, the steaming
Air pressure compression system can only include an evaporator, or it can include two or more evaporators.In latter event
Under, each evaporator can be arranged for a volume individually freezed and provide refrigeration.What these had individually freezed
Volume may, for example, be multiple single showcases of a supermarket.Anyway, each evaporator is preferably connected to one
It is a individually on expansion valve, the cold-producing medium supply of single expansion valve control to the evaporator, the cold-producing medium supply independently of
To the cold-producing medium supply of other evaporators.In addition, an evaporator unit can include single section, or series connection can be included
Two or more sections for connecting or being connected in parallel.
Method according to the first aspect of the invention and the refrigerant via corresponding expansion valve control to single evaporator
Supply related.However, it is possible to this evaporator is arranged in a steaming including the additional evaporator of one or more well
In air pressure compression system, the cold-producing medium supply to these additional evaporators is controlled respectively in this case.
According to method according to the first aspect of the invention, acquisition first flows through the temperature of the air of the evaporator
TAir.This can come preferably by means of being arranged in across an one or more of air passage of evaporator temperature sensor
Complete.Temperature TAirIt may, for example, be the temperature of the air towards evaporator flowing, the temperature of the air away from evaporator flowing
The weighted value of the temperature of degree or the air flowed towards the evaporator and the temperature of the air away from evaporator flowing.This
It will be described in greater detail below.Anyway, TAirExpression is arranged in a volume freezed near the evaporator
Leading temperature.Therefore, TAirThe cooling required of the freezed volume of reflection.
Then, based on the temperature T obtainedAirAnd in order to reach the air for flowing through the evaporator reference
Air themperature TAir, referenceAnd control the opening degree of expansion valve.As described above, TAirLeading temperature in the freezed volume of reflection
Degree, and therefore reflect the cooling required of freezed volume.Reference air temperature TAir, referenceIt is a target temperature, it is desirable to
The target temperature is obtained in the volume freezed.Therefore, the temperature T by that will be obtainedAirWith reference air temperature TAir, referenceInto
Whether row compares, can reveal that leading temperature in freezed volume close to or away from desirable target temperature.Leading
In the case that temperature is away from target temperature, it is also very desirable to further cooling, and should to the cold-producing medium supply of the evaporator
Reach the degree that cooling as much as possible is provided.Similarly, it is right in the case where leading temperature is close to desirable target temperature
The needs further cooled down are lower slightly, and can by provide less cooling but it is opposite ensure low-energy-consumption it is a kind of in a manner of
To control the cold-producing medium supply of the evaporator.
Therefore, under normal circumstances, only to ensure to obtain a desirable target temperature in freezed volume
A kind of mode control the cold-producing medium supply of the evaporator.
It should be noted that the opening degree of increase expansion valve causes the cold-producing medium supply of the evaporator to increase, and reduce
The opening degree of expansion valve causes the cold-producing medium supply of the evaporator to reduce.
Then, there is provided a disturbing signal, and the opening degree of the expansion valve is set to controlled opening degree, with
The disturbing signal is overlapping.Therefore, the opening degree of expansion valve is fluctuated around an average value, which represents controlled opening
Degree, i.e. by the temperature T obtainedAirThe opening degree of instruction.These fluctuations determine by the disturbing signal, and can be such as
It is a delay type or the sine curve of any other suitable type.This will be described in greater detail below.This paper's
In context, term " disturbing signal " should be interpreted to mean the signal changed in a time scale, the time
Scale is significantly more shorter than the time scale that the controlled opening degree of the expansion valve changes on it.
Then, a temperature signal S is monitored2, the temperature signal represent leave the evaporator refrigerant temperature.This can
For example to be completed using a temperature sensor being arranged in the refrigerant path behind the outlet for following evaporator closely.Cause
This, temperature signal S2A relative value of the super heat value of the refrigerant of the evaporator is left in expression.The monitored temperature of analysis
Signal S2。
Finally, in the temperature signal S to being monitored2The analysis of progress discloses a positive convergence in arid region of the evaporator
Reduce the opening degree of expansion valve in the case of one minimum length.
In the context of this article, term " arid region of evaporator " should be interpreted to mean that the evaporator only includes
A part for gaseous refrigerant.One arid region of long length thereby indicate that liquid refrigerant reach evaporator outlet it
It is preceding for a long time to be evaporated in the evaporator, and an arid region of short length indicates liquid refrigerant along the big of the evaporator
Part exists.Therefore, when one minimum length of arid region convergence of evaporator, then liquid/gaseous refrigerant of mixing
The outlet of the positive convergence evaporator in border between pure gaseous refrigerant.As described above, when this border reaches the outlet of evaporator
When, there are the risk that liquid refrigerant is allowed to pass through the evaporator, and therefore there are liquid refrigerant arrival compressor
Risk, so as to cause to damage the compressor.Therefore, when one minimum length of arid region convergence of evaporator, it is necessary to reduce
To the evaporator cold-producing medium supply to avoid this situation.
Arid region one minimum length of whether positive convergence of evaporator can be determined in many ways.The invention of the present invention
People had been found that when one minimum length of arid region convergence of evaporator, temperature signal S2Characteristic with a kind of significant
Mode changes.Therefore, as analysis temperature signal S2When, it can detect these signs changed.For example, the present inventor
It has been found that if the opening degree of expansion valve is slowly increased, then the temperature for leaving the refrigerant of evaporator will be in the expansion
The opening degree of valve reduces suddenly when reaching certain level, wherein the cold-producing medium supply to the evaporator is enough the evaporator
The arid region is reduced to minimum length.This can be considered as one " unstable region ".If the opening degree is even into one
The increase of step ground, there are the material risk that liquid refrigerant passes through evaporator.This can be considered as one " critical zone ".
Therefore, analysis temperature signal S2The step of can include obtaining temperature signal S2Rate of change, and reduce opening
The step of degree, can be included in temperature signal S2An absolute value of rate of change reach a maximum (such as one total
Body maximum or a local maximum) in the case of reduce expansion valve opening degree.As described above, temperature signal S2Into
Reduce suddenly when entering the unstable region.Therefore, as temperature signal S2The absolute value of rate of change when reaching maximum, can be with
Deduction comes into the unstable region, and the arid region of evaporator therefore positive convergence minimum length.Actual maximum
It is not a fixed value or unique value, but can be changed according to operating point.However, an extreme value of the signal is up to,
Because one saddle point of the curve definitions, and be exactly that the instruction of this saddle point comes into the unstable region.
Before unstable region is reached, signal S2A sag vertical curve is followed, there are one in the centre of the unstable region
A saddle point, and from the unstable region until the evaporator by untill flooding completely, signal S2Follow a convex curve.At this
On valley, the rate of change of signal is negative, and becomes smaller closer to saddle point.At the saddle point, signal S2's
Rate of change reaches its minimum value.Therefore, by calculating signal S2Rate of change minimum value, can identify and represent shakiness
Determine the saddle point at the center in region.Since when performing this process, expansion valve is largely opened, it is clear that the drying of evaporator
Its minimum length of region convergence.Therefore, the opening degree of expansion valve must be reduced at this time to avoid enter into critical zone.
Alternately, analysis temperature signal S2The step of may comprise steps of：
- identification temperature signal S2Corresponding to the one-component of disturbing signal,
- by temperature signal S2The component identified compared with initial disturbance signal, and
- arid region of evaporator one minimum length of whether positive convergence determined based on the comparison.
Temperature signal S2Component may, for example, be these temperature signals S2Change, the component correspond to by disturbing signal
And/or the change of opening degree that multiple specific frequency components of the signal are limited.For example, it is a sine in disturbing signal
In the case of signal, which may, for example, be with the frequency substantially the same from the sinusoidal perturbation signal or with different
One frequency component of frequency.For example, the component can be a frequency component for some sinusoidal signal sums.
By by temperature signal S2The component identified compared with initial disturbance signal, announcement be applied to expansion valve
These disturbances of opening degree monitored temperature signal S is influenced in a manner of any2.This relatively can be disturbing signal with
A reality between the component identified is relatively.Alternately, this relatively can be the individual features of the two signals (such as
Frequency and/or amplitude) between comparison.
It has been found by the inventor that what these disturbing influences for being applied to the opening degree of the expansion valve were monitored
Temperature signal S2Mode when entering arid region therefore positive one minimum length of convergence of unstable region and evaporator
Significantly change.If in analysis temperature signal S2Period detects such sign significantly changed, it can therefore be concluded that evaporation
Arid region one minimum length of positive convergence of device, and therefore must reduce the opening degree of expansion valve to prevent liquid system
Cryogen reaches compressor.
For example, in the case where the component identified of disturbing signal is a basic frequency, then temperature signal S2Can be with
Include the basic frequency and one or more other frequency components, such as the harmonic wave corresponding to the basic frequency.Perform temperature letter
Number S2A Fast Fourier Transform (FFT) (FFT) many parameters will be produced, these parameters correspond to these other frequency components.
The sign of these parameters will change when reaching saddle point as described above (that is, when reaching unstable region).Therefore, detection is worked as
To the sign of these parameters change when, it is necessary to reduce the opening degree of expansion valve to avoid liquid refrigerant from reaching compression
Machine.
By temperature signal S2The component identified compared with initial disturbance signal the step of can include determining that temperature
Spend signal S2One of the component identified distortion.In some cases, the distortion of the component can be into range of instability
Significantly changed during domain.Therefore, when detecting such change, it may infer that the positive convergence in arid region one of evaporator is minimum long
Degree, and therefore must reduce the opening degree of expansion valve to prevent liquid refrigerant from reaching compressor.The distortion can example
It is a perfect sinusoidal signal as included the disturbing signal, and the component identified is a fluctuation of the temperature signal, should
Temperature signal has a frequency of the frequency that can be similar to the sinusoidal perturbation signal, but is not a perfect sinusoidal letter
Number.Alternately, which can be the combination of some frequencies of the multiplier for the frequency of initial disturbance signal.
As another alternative solution, analysis temperature signal S2The step of can include identification temperature signal S2One or
Multiple statistics components.These statistics components can be such as the average value including the signal, variance.Or the statistics component can be with
Including temperature signal S2In probability distribution other descriptors.For example, work as temperature signal S2During convergence unstable region, temperature
Signal S2Variance increase.Similarly, as temperature signal S2During away from unstable region movement, corresponding variance is tended to significantly
Ground reduces.
Disturbing signal can be the signal of a sinusoidal type.In this case, the opening degree of expansion valve is with one kind
Substantially sinusoidal mode is around the fluctuation of opening degree value, and the opening degree value is by flowing through the temperature of the air of evaporator
TAirInstruction.Can be in the temperature signal S monitored2The frequency of middle identification sinusoidal perturbation signal.
Alternately, which can be the signal of a delay type.In this case, expand
The opening degree of valve fluctuates in a manner of a kind of deferred class or as a square-wave signal around the opening degree value, this dozen
Degree value is opened by flowing through the temperature T of the air of evaporatorAirInstruction.
As another alternative solution, which can have any other suitable species, it is therefore preferable to one
Periodic signal, such as a triangular signal.
Temperature TAirIt can be directed towards the temperature of the air of evaporator flowing.According to this embodiment, evaporation is passed through in air
Device and before thus cooling down, the opening journey of expansion valve is controlled based on the leading temperature of the air in one refrigerated volume
Degree.It assume that this temperature will be relatively slowly changes, because it represents the temperature in whole refrigerated volume.
Alternately, temperature TAirIt can be the temperature of the air away from evaporator flowing.According to this implementation
Example, also controls the opening degree of expansion valve based on the leading temperature of the air in one refrigerated volume.However, this
In the case of, measurement has just passed through the temperature of evaporator and the air therefore just cooled down by evaporator.Therefore, this temperature
The leading temperature that degree will not only reflect in whole refrigerated volume, but also will reflect the instantaneous cooling power of evaporator, because
One high cooling power will reduce this temperature.Therefore,, will when controlling the opening degree of expansion valve according to this embodiment
The instantaneous cooling power of evaporator is taken into account.
As another alternative solution, temperature TAirIt can represent to steam with remote towards the temperature of the air of evaporator flowing
Send out the weighted value of the temperature of the air of device flowing., also will evaporation when controlling the opening degree of expansion valve according to this embodiment
The instantaneous cooling power of device is taken into account.However, in this case, influence to controlled opening degree with above-mentioned implementation
Smaller is compared in example.
This method, which may further include, is flowing through the temperature T of the air of evaporatorAirIn a pre-qualified upper limit
A step of temperature-fall period is performed in the case of more than threshold value.If temperature TAir, can be false more than pre-qualified upper limit threshold
If actual air temperature TAirWith target temperature or reference temperature TAir, referenceBetween difference be relatively large, i.e. TAirIt is significantly high
In TAir, reference.In this case, it is possible to it must rapidly reduce actual air temperature TAir, so as to rational at one
Reach T in periodAir, reference.This can be obtained by performing a temperature-fall period in this case.Above and below this paper
Wen Zhong, term " temperature-fall period " should be interpreted to mean to apply a maximum or at least very high cooling power so as to
Cooling or a process for rapidly reducing the air themperature in the volume freezed.It can for example with initial start system
It is related that a temperature-fall period is performed during system or when multiple new products are positioned in refrigerated volume.
The step of performing a temperature-fall period may comprise steps of：
- expansion valve is opened to a maximum opening degree,
One temperature signal S of-monitoring2, the temperature signal represent leave the evaporator refrigerant temperature,
- analysis temperature signal S2, and
- in the analysis announcement temperature signal S2The absolute value of a rate of change have reached the feelings of a maximum
Reduce the opening degree of the expansion valve under condition.
The expansion valve is opened to a maximum opening degree ensures that evaporator is filled as quickly as possible, and thus true
Protect and a maximum cooling power is provided.Allow liquid refrigerant through evaporator and potentially reach to compress however, this is further included
The risk of machine.
Therefore, as described above, one temperature signal S of monitoring and analysis2, which represents to leave the refrigeration of evaporator
The temperature of agent.Temperature signal S is disclosed in the analysis2The absolute value of a rate of change have reached the situation of a maximum
Under, reduce the opening degree of expansion valve.
As described above, the temperature signal S monitored2The unexpected of rate of change reduce instruction and come into range of instability
Domain, and one minimum length in the arid region of evaporator therefore positive convergence.Therefore, if this instruction has the maximum of expansion valve
Opening degree, which is maintained, then allows liquid refrigerant to pass through the risk of evaporator, and therefore must reduce the opening of expansion valve
Degree is to avoid this situation.
Therefore, according to this embodiment, there is provided an effective temperature-fall period, while ensure not allow liquid refrigerant to arrive
Up to compressor.
According to second aspect, the present invention provides a kind of for being controlled during a temperature-fall period to a steam compressed system
The method of the cold-producing medium supply of one evaporator of system, the vapor compression system include at least one evaporator, at least one pressure
Contracting machine, at least one condenser and at least one expansion valve being arranged in a refrigerant loop, this method include with
Lower step：
- expansion valve is opened to a maximum opening degree,
One temperature signal S of-monitoring2, the temperature signal represent leave the evaporator refrigerant temperature,
- analysis temperature signal S2, and
- in the analysis announcement temperature signal S2A rate of change absolute value reach a maximum in the case of
Reduce the opening degree of the expansion valve.
It should be noted that those skilled in the art will readily appreciate that, with reference to described of the first aspect of the present invention
What feature can be combined with the second aspect of the invention, and vice versa.Therefore, these remarks listed above are herein
It is same applicatory.
The temperature-fall period of the second aspect of the present invention is described in detail above.
Brief Description Of Drawings
The present invention is more fully described now with reference to attached drawing, in the accompanying drawings：
Fig. 1 is the temperature S monitored for showing to become with the opening degree of an expansion valve2Curve map,
Fig. 2 is performed for one of an a kind of vapor compression system of the method for first embodiment according to the present invention
The schematic diagram divided,
Fig. 3 is performed for one of a vapor compression system of a kind of method according to the second embodiment of the present invention
The schematic diagram divided, and
Fig. 4 is to show the opening degree of expansion valve and steaming when performing a kind of method according to an embodiment of the invention
The curve map of the temperature monitored of air pressure compression system.
Attached drawing describes in detail
Fig. 1 is the evaporator for leaving a vapor compression system for showing to become with the opening degree of an expansion valve
Refrigerant the temperature S monitored2Curve map, the expansion valve control to the evaporator cold-producing medium supply.
As can be seen that when the opening degree of expansion valve is relatively small, the temperature monitored of the refrigerant of evaporator is left
S2It is relatively high, close to the temperature T of surrounding airAir.In addition, the temperature S monitored2In the opening degree increase of the expansion valve
When keep nearly constant.This instruction is fed to the liquid part of the refrigerant of evaporator before it reaches the outlet of the evaporator
For a long time it is evaporated.Thus it can be assumed that the super heat value for leaving the refrigerant of evaporator is relatively high, and liquid refrigerant
Risk through the evaporator is low-down.
Further increase with the opening degree of expansion valve, the temperature S monitored2Towards evaporating temperature TeIt is significantly and prominent
So reduce, the evaporating temperature i.e., the temperature or dew point that refrigerant evaporates under the leading pressure of the refrigerant.Therefore, when
The temperature S monitored2Convergence evaporating temperature TeWhen, this be super heat value just leveling off to zero instruction.This is the dry section of evaporator
The instruction of positive one minimum length of convergence in domain, and be the just increased instruction of risk that liquid refrigerant passes through the evaporator.
The temperature S monitored2The region reduced suddenly can be referred to as one " unstable region ".When monitoring and analysis temperature
Spend S2When, it can for example pass through the rate of change for monitoring the temperature signal and a bare maximum for identifying the rate of change
And detect into this region, because the rate of change will be big and negative.However, as set forth above, it is possible to otherwise
Detect and enter the unstable region.
The temperature S monitored2Rate of change reduce again and temperature S2The region for becoming very close evaporating temperature can
To be referred to as one " critical zone " because this be there are liquid refrigerant be allowed to pass through evaporator excessive risk and by
This can reach the region of the risk of compressor there are liquid refrigerant.
Therefore, it is intended that the opening degree of control expansion valve, its mode is so that does not enter the critical zone.According to this hair
Bright, this can be obtained by reducing the opening degree of expansion valve when detecting into the unstable region.It is this when occurring
During situation, if the opening degree of expansion valve further increases, critical zone will be reached.Therefore, if the opening journey of expansion valve
Degree reduces when entering unstable region, can prevent from entering critical zone.
It should be noted that due to evaporating temperature TeDepending on the leading pressure in refrigerant, will normally e insufficient to measure
Leave the temperature S of the refrigerant of evaporator2, and by measured temperature compared with a fixed evaporating temperature.This
It is exactly why to monitor and analysis temperature signal S in the method for the invention2, such as obtain the rate of change of the temperature signal so as to
Detect when to enter unstable region.
Fig. 2 is performed for the one of an a kind of vapor compression system 1 of the method for first embodiment according to the present invention
Partial schematic diagram.Vapor compression system 1 includes an evaporator 2, and the evaporator is together with one or more compressor (not shown)
It is arranged at one or more condenser (not shown) in a refrigerant loop.One expansion valve 3 is also arranged at the system
In refrigerant circuit, for controlling the cold-producing medium supply to evaporator 2.
Vapor compression system 1 further comprises many temperature sensors.One the first temperature sensor 4 is in evaporator 2
It is arranged at behind outlet in the refrigerant loop.Therefore, the first temperature sensor 4 measures a temperature signal S2, temperature letter
Number represent leave evaporator 2 refrigerant temperature.
One second temperature sensor 5 is arranged at across in second air stream of evaporator 2, is reached and is steamed in the air
At a position before hair device 2.Therefore, second temperature sensor 5 measures a temperature signal S3, temperature signal expression court
The temperature of the air flowed to evaporator 2.
One three-temperature sensor 6 is arranged at across in the second air stream of evaporator 2, has passed through steaming in the air
At a position after hair device 2.Therefore, three-temperature sensor 6 measures a temperature signal S4, temperature signal expression is far
The temperature of the air flowed from evaporator 2.
The temperature signal S that will be measured by second temperature sensor 53With the temperature signal S measured by three-temperature sensor 64
It is supplied to a sensor selection unit 7.Sensor selection unit 7 chooses whether to apply these temperature when controlling expansion valve 3
Signal S3And S4In one or application the two temperature signals S3And S4A weighted value.The selection can for example based on
The availability of sensor 5 and 6, or the selection based on setter.Based on the selection, a temperature signal T is generatedAir, and
TAirRepresent to correspond to as an air themperature of the selection performed by selecting unit 7.Believe to 8 supply temperature of control unit
Number TAir, the control unit be arranged to control expansion valve 3 opening degree.
Return control unit 8 and supply a reference air temperature TAir, reference.Reference air temperature TAir, referenceExpression flows through
A desirable reference temperature or target temperature in the air of evaporator 2.
Control unit 8 is by temperature signal TAirWith reference air temperature TAir, referenceIt is compared, and meter is compared based on this
Calculate the opening degree of expansion valve 3.The opening degree of expansion valve 3 is selected, its mode is so that the opening degree ensures evaporator 2
Cold-producing medium supply, this causes air themperature TAirConvergence reference air temperature TAir, reference.Therefore, control unit 8 is based on selected
Air themperature TAirAnd in order to reach reference air temperature TAir, referenceAnd control the opening degree of expansion valve 3.
Return control unit 8 and supply the temperature signal S measured by the first temperature sensor 42.Thus, when by control unit 8
When calculating the opening degree of expansion valve 3, the temperature for the refrigerant for leaving evaporator 2 can also be taken into account.
When control unit 8 has been computed the opening degree of expansion valve 3 as described above, control unit 8 is to being calculated
Opening degree applies a disturbing signal.In the embodiment shown in fig. 2, which is the disturbance letter of a deferred class
Number.The signal produced to the supply of expansion valve 3, and the opening degree of expansion valve 3 is controlled into the opening degree calculated, with this
Disturbing signal is overlapping.
Therefore, under normal circumstances, based on air themperature TAirControl the opening degree of expansion valve 3 and thus control and arrive
The cold-producing medium supply of evaporator 2, to obtain reference air temperature TAir, reference, but this is overlapping with the disturbing signal.
However, returning an analytic unit 9 supplies the temperature signal S measured by the first temperature sensor 42.Analytic unit 9
Specifically on temperature signal S2Rate of change carry out analysis temperature signal S2.It should be analyzed to 10 confession of security logic
Result.10 monitoring temperature signal S of security logic2Rate of change, and in temperature signal S2Rate of change it is absolute
In the case that value reaches a maximum, security logic 10 sends the opening journey of request reduction expansion valve 3 to control unit 8
One signal of degree.In response to this signal, control unit 8 reduces the opening degree of expansion valve 3.
As described above, when the rate of change for leaving the temperature of refrigerant of evaporator 2 reduces suddenly, this is to come into
The sign of unstable region, and be if the opening degree of expansion valve 3 does not reduce, it there is the risk into critical zone
Sign.Therefore, security logic 10 ensures effectively to prevent from allowing liquid refrigerant to pass through evaporator 2 simultaneously by this way
And reach compressor.
Fig. 3 is performed for the one of a vapor compression system 1 of a kind of method according to the second embodiment of the present invention
Partial schematic diagram.The vapor compression system 1 of Fig. 3 is operated in a manner of a kind of operation of the vapor compression system similar to Fig. 2, and
And the operation of vapor compression system 1 therefore will not be described in detail further herein.
The vapor compression system 1 of Fig. 3 further comprises first bandpass filter 11, selected temperature signal TAir
Together with reference air temperature TAir, referenceThe bandpass filter is passed through together, reaches a control unit 12.Control unit 12 can be with
E.g. proportional integration (PI) adjuster.The output of control unit 12 is supplied to a sum unit 13.
The vapor compression system 1 of Fig. 3 further includes second bandpass filter 14, is measured by the first temperature sensor 4
Temperature signal S2Second bandpass filter is passed through before sum unit 13 is supplied to.
Sum unit 13 is further equipped with a reference temperature signal S2, reference, reference temperature signal expression is for leaving
A target temperature or reference temperature for the refrigerant of evaporator 2.
Make these temperature signals TAirAnd S2Ensure only using in a desirable frequency band through bandpass filter 11 and 14
Temperature signal control the opening degree of expansion valve 3.It should be noted that these bandpass filters 11 and 14 can be easily at this
Realized in a little control units 12 and 8.
Based on these signals supplied to it, sum unit 13 provides an input signal to control unit 8.The input is believed
Number selected air themperature T of reflectionAirWith the reference air temperature T provided by control unit 12Air, referenceBetween comparison, with
And measured temperature signal S2With reference temperature S2, referenceBetween comparison, this is performed by sum unit 13.
Basically described above, the opening degree of expansion valve 3 is calculated based on the input signal, control unit 8.Asked to one
Calculated opening degree is supplied with unit 15.One disturbance unit 16 generates a disturbing signal and by this disturbing signal
It is supplied to sum unit 15.The opening degree of expansion valve 3 is then defined to the institute overlapping with the disturbing signal by sum unit 15
The opening degree of calculating.In the fig. 3 embodiment, the disturbing signal is a sinusoidal signal.
The release mechanism provided by analytic unit 9 and security logic 10 is operated with reference to figure 2 basically described above, only
It is that it can apply a variety of alternative methods for detecting and coming into unstable region.It is described above such alternative
Method.
Fig. 4 is to show the opening degree of expansion valve and steaming when performing a kind of method according to an embodiment of the invention
The curve map of the temperature monitored of air pressure compression system.The vapor compression system may, for example, be the vapor compression system of Fig. 2, or
The vapor compression system of person Fig. 3.
The curve of Fig. 4 illustrates how opening degree 17 changes over time, and the measurement in the vapor compression system
Different temperatures how react by these changes to opening degree 17.It should be noted that in Fig. 4, for clarity, show do not have
There is the opening degree 17 of overlapping disturbing signal.Curve map 18 represents to leave the temperature of the refrigerant of evaporator, i.e. corresponding to upper
State temperature signal S2.Curve map 19 represents the temperature of the air towards evaporator flowing, i.e. corresponding to above-mentioned temperature signal S3.It is bent
Line chart 20 represents the temperature of the air away from evaporator flowing, i.e. corresponding to above-mentioned temperature signal S4.Curve map 21 represents evaporation
Temperature, i.e. the temperature that refrigerant evaporates in evaporator.Leading pressure of this temperature in refrigerant and change.Finally,
Curve map 22 represents reference air temperature TAir, reference。
From fig. 4, it can be seen that initially these temperature 18,19 and 20 are all relatively high.Specifically, these air
Temperature 19,20 is significantly than 22 higher of reference air temperature, and the temperature 18 for leaving the refrigerant of evaporator significantly compares
21 higher of evaporating temperature.This is because following facts：The vapor compression system after a period of time is had been switched off recently
Connect, and indicate to need a larger cooling effect to reach reference air temperature 22.In addition, leave the system of evaporator
The super heat value of cryogen is relatively high, and therefore the risk of liquid refrigerant through evaporator is low-down.
Therefore, a temperature-fall period is started.This includes expansion valve being opened to a maximum opening degree, while monitors this
A little different temperature signals 18,19,20.It is clear that this causes measured air themperature 19,20 to subtract rapidly from Fig. 4
It is small.In addition, the temperature 18 for leaving the refrigerant of evaporator reduces and convergence evaporating temperature 21, i.e. leaves being somebody's turn to do for the evaporator
The super heat value of refrigerant reduces towards zero.
Soon, the absolute value for leaving the rate of change of the temperature 18 of the refrigerant of evaporator reaches a maximum.In Fig. 4
In this can be regarded as to one of temperature 18 reduce suddenly.As described above, this is an instruction for coming into unstable region,
And accordingly, in response to the instruction, the opening degree 17 of the expansion valve is reduced to a minimum value.Thus, terminate and cooled down
Journey, and enter a system identification period.From Fig. 4 be clear that by opening degree 17 be reduced to minimum value when
Wait, the really positive convergence evaporating temperature 21 of temperature 18.
During system identification period, the opening degree 17 of the expansion valve switches between the maximum and the minimum value,
Monitor these temperature 18,19,20 at the same time.As can be seen that whenever the temperature 18 for the refrigerant for leaving evaporator is dashed forward in the above described manner
When so reducing, opening degree 17 is just switched to minimum value from maximum.One of the target in the system identification period is to identify that this is
The current operation point of system.
Soon, the system identification period is terminated, and starts a normal control period.In normal phase control period
Between, the temperature 20 based on the air away from evaporator flowing and control the opening journey of expansion valve to reach reference temperature 22
Degree 17.However, also applying a security process, the security process is for example by means of the analysis of the rate of change to temperature signal 18
Come ensure the opening degree 17 of the expansion valve detect come into unstable region in the case of be reduced to minimum value.Scheming
In the situation of 4 displayings, the temperature 18 for leaving the refrigerant of evaporator keeps substantially exceeding steaming during the whole normal control period
Send out temperature 21.Therefore, and unstable region is introduced into, there is no the risk that liquid refrigerant passes through evaporator, and therefore not
Using the security process.
Claims (12)
1. one kind is used for the method for the cold-producing medium supply controlled to an evaporator (2) of a vapor compression system (1), the steaming
Air pressure compression system (1) includes at least one evaporator (2), at least one compressor, at least one condenser and is arranged at
At least one expansion valve (3) in one refrigerant loop, this method comprises the following steps：
- acquisition flows through a temperature T of the air of the evaporator (2)Air,
- temperature the T based on the acquisitionAirAnd in order to reach a reference air of the air for flowing through the evaporator (2)
Temperature TAir, referenceTo control the opening degree of the expansion valve (3),
- disturbing signal is provided, and the opening degree of the expansion valve (3) is set to controlled opening degree, with this
Disturbing signal is overlapping, and thus the opening degree of the expansion valve (3) is fluctuated around an average value, which represents by being obtained
The temperature T obtainedAirThe controlled opening degree indicated；
One temperature signal S of-monitoring2, the temperature signal represent leave the evaporator (2) refrigerant temperature,
- analyze temperature signal S2, and
- in the case where the analysis discloses an arid region one minimum length of positive convergence of the evaporator (2), reducing should
The opening degree of expansion valve (3).
2. according to the method described in claim 1, wherein analyze temperature signal S2The step include obtaining temperature signal S2
Rate of change, and the step for wherein reducing the opening degree is included in temperature signal S2The rate of change it is absolute
Value reduces the opening degree of the expansion valve (3) in the case of reaching a maximum.
3. according to the method described in claim 1, wherein analyze temperature signal S2The step comprise the following steps：
- identify temperature signal S2Corresponding to the one-component of the disturbing signal,
- by temperature signal S2The identification component compared with initial disturbance signal, and
- arid region of the evaporator (2) one minimum length of whether positive convergence determined based on the comparison.
4. according to the method described in claim 3, wherein the comparison step includes determining temperature signal S2The identification component
One distortion.
5. according to the method described in claim 1, wherein analyze temperature signal S2The step include identifying temperature signal S2
One or more statistics components.
6. method according to any one of the preceding claims, the wherein disturbing signal are the signals of a sinusoidal type.
7. according to the method any one of claim 1-5, the wherein disturbing signal is the signal of a delay type.
8. according to the method any one of claim 1-5, wherein temperature TAirIt is directed towards the evaporator (2) flowing
The temperature of air.
9. according to the method any one of claim 1-5, wherein temperature TAirIt is to be flowed away from the evaporator (2)
The temperature of air.
10. according to the method any one of claim 1-5, wherein temperature TAirRepresent to flow towards the evaporator (2)
Air temperature with away from the evaporator (2) flowing air temperature a weighted value.
11. according to the method any one of claim 1-5, further comprise flowing through the sky of the evaporator (2)
The temperature T of gasAirA step of temperature-fall period is performed in the case of more than a pre-qualified upper limit threshold.
12. according to the method for claim 11, wherein the step for performing a temperature-fall period comprises the following steps：
- expansion valve (3) is opened to a maximum opening degree,
One temperature signal S of-monitoring2, the temperature signal represent leave the evaporator (2) refrigerant temperature,
- analyze temperature signal S2, and
- in analysis announcement temperature signal S2The absolute value of a rate of change have reached the situation of a maximum
Under, reduce the opening degree of the expansion valve (3).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP14151107.1A EP2894421A1 (en) | 2014-01-14 | 2014-01-14 | A method for controlling a supply of refrigerant to an evaporator based on temperature measurements |
| EP14151107.1 | 2014-01-14 | ||
| PCT/EP2014/077904 WO2015106906A1 (en) | 2014-01-14 | 2014-12-16 | A method for controlling a supply of refrigerant to an evaporator based on temperature measurements |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105874289A CN105874289A (en) | 2016-08-17 |
| CN105874289B true CN105874289B (en) | 2018-04-20 |
Family
ID=49949538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480072306.6A Expired - Fee Related CN105874289B (en) | 2014-01-14 | 2014-12-16 | Method for the cold-producing medium supply based on Temperature Measure Control to evaporator |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20160327322A1 (en) |
| EP (1) | EP2894421A1 (en) |
| CN (1) | CN105874289B (en) |
| RU (1) | RU2640142C1 (en) |
| WO (1) | WO2015106906A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10663200B2 (en) | 2016-01-13 | 2020-05-26 | Danfoss A/S | Method for controlling a supply of refrigerant to an evaporator in contingency mode |
| CN106642546B (en) * | 2016-11-30 | 2019-03-26 | 宁波奥克斯电气股份有限公司 | The control method of the outer machine electric expansion valve of multi-connected machine when heating |
| JP7028191B2 (en) * | 2017-01-16 | 2022-03-02 | 日本電気株式会社 | Valve control device, cooling device and valve control method |
| KR102364677B1 (en) * | 2017-03-20 | 2022-02-18 | 엘지전자 주식회사 | Control Method for Laundry Treating Apparatus |
| CN115060015A (en) * | 2022-06-22 | 2022-09-16 | 珠海格力智能装备有限公司 | Cooling system and control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4100749A1 (en) * | 1991-01-12 | 1992-07-16 | Danfoss As | Regulator device for refrigerator - cools each evaporator in air current to chamber and has air temp. probe in each evaporator air flow |
| CN1512284A (en) * | 2002-10-08 | 2004-07-14 | Controller and method for controlling expansion valve of refrigeration system | |
| WO2010025730A1 (en) * | 2008-09-05 | 2010-03-11 | Danfoss A/S | A method for controlling a flow of refrigerant to an evaporator |
| WO2012052019A1 (en) * | 2010-10-20 | 2012-04-26 | Danfoss A/S | A method for controlling a supply of refrigerant to an evaporator |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2006762C1 (en) * | 1991-10-09 | 1994-01-30 | Акционерное общество "СК Премьер" | Method of automatic control of evaporator liquid cooling process |
| US7275377B2 (en) * | 2004-08-11 | 2007-10-02 | Lawrence Kates | Method and apparatus for monitoring refrigerant-cycle systems |
| DE102006052321A1 (en) * | 2005-11-24 | 2007-06-06 | Danfoss A/S | Method of analyzing a refrigeration system and method of controlling a refrigeration system |
| US20070175229A1 (en) * | 2006-02-01 | 2007-08-02 | Redlich Robert W | Method for controlling a pulsed expansion valve |
| RU2362948C2 (en) * | 2007-08-23 | 2009-07-27 | Федеральное государственное образовательное учреждение высшего профессионального образования "Балтийская государственная академия рыбопромыслового флота" | Device to control refrigerator compressor wet circuit |
-
2014
- 2014-01-14 EP EP14151107.1A patent/EP2894421A1/en not_active Withdrawn
- 2014-12-16 RU RU2016125862A patent/RU2640142C1/en not_active IP Right Cessation
- 2014-12-16 CN CN201480072306.6A patent/CN105874289B/en not_active Expired - Fee Related
- 2014-12-16 US US15/109,521 patent/US20160327322A1/en not_active Abandoned
- 2014-12-16 WO PCT/EP2014/077904 patent/WO2015106906A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4100749A1 (en) * | 1991-01-12 | 1992-07-16 | Danfoss As | Regulator device for refrigerator - cools each evaporator in air current to chamber and has air temp. probe in each evaporator air flow |
| CN1512284A (en) * | 2002-10-08 | 2004-07-14 | Controller and method for controlling expansion valve of refrigeration system | |
| WO2010025730A1 (en) * | 2008-09-05 | 2010-03-11 | Danfoss A/S | A method for controlling a flow of refrigerant to an evaporator |
| WO2012052019A1 (en) * | 2010-10-20 | 2012-04-26 | Danfoss A/S | A method for controlling a supply of refrigerant to an evaporator |
Also Published As
| Publication number | Publication date |
|---|---|
| US20160327322A1 (en) | 2016-11-10 |
| CN105874289A (en) | 2016-08-17 |
| RU2640142C1 (en) | 2017-12-26 |
| WO2015106906A1 (en) | 2015-07-23 |
| EP2894421A1 (en) | 2015-07-15 |
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