CN105278577B - A kind of degree of superheat detection method in two-phase flow cooling system - Google Patents
A kind of degree of superheat detection method in two-phase flow cooling system Download PDFInfo
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- CN105278577B CN105278577B CN201510152372.0A CN201510152372A CN105278577B CN 105278577 B CN105278577 B CN 105278577B CN 201510152372 A CN201510152372 A CN 201510152372A CN 105278577 B CN105278577 B CN 105278577B
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Abstract
The present invention relates to the degree of superheat detection method in a kind of two-phase flow cooling system, include the circulation line comprising refrigerant in two-phase flow cooling system, it is sequentially provided with circulation line in reservoir, cryogenic fluid pump, heat exchanger and filter, two-phase flow cooling system and is additionally provided with temperature sensor, pressure sensor and the control unit for detecting the degree of superheat；Data acquisition module connects temperature sensor and pressure sensor with collecting temperature value and pressure value respectively in control unit, and the data acquisition module is connected with A/D modular converters, and A/D modular converters pass through I2Data input after conversion to controller, the controller are connected host computer by C buses；Refrigerant superheat degree calculation procedure is provided with the controller, and corresponding actions are made according to the degree of superheat of calculating.Degree of superheat detection method in two-phase flow cooling system of the present invention can simply calculate the degree of superheat of current refrigerant exactly, judge whether system lacks liquid and whether need to close whole cooling system according to its numerical value.
Description
Technical field
The present invention relates to electrical cooling heat dissipation technology, the degree of superheat used in a kind of two-phase flow cooling system is related specifically to
Detection method.
Background technology
With power electronics industrial expansion, level of integrated system is in the increase of geometry multiple.In the practical application of same equipment
In, in order to save space and improve integrated level, it will usually install multiple power modules in same coldplate or single cooling circuit
On with multiple thermals source of connecting.According to conventional chilling mode is for example air-cooled, liquid is cold etc., the temperature of cooling fluid can be with the heat of absorption
Amount increases and steadily improved, and can so cause cooling fluid turnover to have certain temperature difference.Many times, due to pipeline,
Runner and cooling fluid density change, and its temperature difference can become quite big.
Sizable radiating surplus can be all reserved in actual design, so as to improve the reliability of cooled part.In addition, existing
It is all as low-temperature receiver, the result is that cooling medium circular flow is big and expends many electrical power using single-phase medium to have cooling scheme
On cooling device.According to years of researches, it is believed that liquid phase-change cooling can just meet the demand.And once use
Two-phase cooling scheme, must just have detection method to ensure that cooling medium must be two phases in coldplate, otherwise can burn
Cooled part.It is general in the prior art to be carried out using the pressure of heat exchanger import and the pressure difference of import and export with the temperature at import
Compare to determine the degree of superheat, but it can not simply reflect the degree of superheat of refrigerant in current system exactly, also can not root
Protected accordingly according to the current degree of superheat.
The content of the invention
The deficiency for aiming to overcome that existing degree of superheat detection technique of patent of the present invention, the present invention provides a kind of overheat
Spend detection technique.The inventive method coordinates data acquisition equipment and data using the pressure and temperature sensor deposited in system
Processing equipment, the degree of superheat of current refrigerant can be simply detected exactly, it is to avoid refrigerant or blocking are lacked due to system and
Burn cooled electron electric power component.
In order to realize foregoing invention purpose, the invention provides following technical scheme：
Include in a kind of degree of superheat detection method in two-phase flow cooling system, the two-phase flow cooling system comprising system
The circulation line of cryogen, is sequentially provided with reservoir, cryogenic fluid pump, heat exchanger and filter on described circulation line, and it is special
Levy and be, temperature sensor, pressure sensor are additionally provided with described two-phase flow cooling system and for detecting the degree of superheat
Control unit, described temperature sensor is arranged on system entry position in the circulation loop of refrigerant and is used to collecting temperature value
T1, pressure sensor be arranged on refrigerant circulation loop in system entry position to gather pressure value P 1；
Data acquisition module, controller and host computer, described data acquisition module point are provided with described control unit
Not Lian Jie temperature sensor and pressure sensor with collecting temperature value and pressure Value Data, the data of collection pass through an A/D and turned
Mold changing block is converted to data signal through I2C buses are inputted to described controller, and the controller connects described by RS485 buses
Host computer；Refrigerant superheat degree calculation procedure is provided with described controller, host computer is made according to the degree of superheat of calculating
Corresponding actions；
Described refrigerant superheat degree calculation procedure includes：
1）Refrigerant saturation temperature value T1a and corresponding pressure value P1a is read according to the pressure-enthalpy chart of refrigerant R134a, in advance
By refrigerant saturation temperature value T1a and corresponding pressure value P1a list data storage in a control unit, include in the form
Saturation temperature value T1a and pressure value P 1a, the form saturation temperature value is corresponding using indexing with pressure value；
2）The real-time pressure value obtained according to data collecting module collected and after the conversion of A/D modular converters is using above-mentioned
Table lookup goes out theoretical saturation temperature value and by data storage；
3）The real-time temperature values of collection are compared with the theoretical saturation temperature value found out, if actual temperature value is fuller than theoretical
It is high with temperature value, then judge that refrigerant is in superheat state, its degree of superheat is that actual temperature value subtracts theoretical saturation temperature value.
In degree of superheat detection method in two-phase flow cooling system of the present invention, described refrigerant superheat degree calculation procedure
In, if the real-time pressure value collected is between two adjacent pressure values in form, two adjacent pressures in acquiescence form
The force value saturation temperature value adjacent with two is linear relationship, and the corresponding theoretical saturation temperature of real-time pressure value is calculated accordingly
Value.
In degree of superheat detection method in two-phase flow cooling system of the present invention, when what is calculated by real-time pressure value P1
When theoretical saturation temperature value T1a is less than T1, then it represents that now refrigerant is in superheat state；When T1-T1a >=2 DEG C, represent
System lacks refrigerant, it is necessary to rush note refrigerant, while controller can send shutdown command and the display alarm shape in host computer
State, cooling system enters shutdown process.
Based on above-mentioned technical proposal, degree of superheat detection method and prior art phase in two-phase flow cooling system of the invention
Than with following technological merit：
1. the degree of superheat detection method in two-phase flow cooling system of the present invention utilizes pressure sensor and temperature in system
Sensor, calculates the degree of superheat in real time using certain algorithm in a control unit, is judged whether to lack liquid according to the value of the degree of superheat
And whether need to close cooling system.
2. the degree of superheat detection method of the present invention only needs to the system entry position in the circulation loop of refrigerant in practice
One pressure sensor of installation and a temperature sensor are put, the overheat of current refrigerant simply can be accurately calculated
Degree, without calculating the degree of superheat by calculating the pressure difference and heat exchanger entrance pressure at heat exchanger two ends.
Brief description of the drawings
Fig. 1 is the degree of superheat detection method system arrangement schematic diagram in two-phase flow cooling system of the present invention.
Fig. 2 is the control flow chart of the degree of superheat detection method in two-phase flow cooling system of the present invention.
Embodiment
We come to the degree of superheat detection in two-phase flow cooling system of the present invention with reference to accompanying drawing and specific embodiment below
Method is further elaborated, and in the hope of providing a clearer understanding of its structure composition and workflow, but can not be come with this
The protection domain of limitation patent of the present invention.
Because cooling system employs two-phase cooling scheme, must just there is detection method to ensure cooling medium in coldplate
In must be two phases, otherwise once be changed into pure gaseous state, its heat transfer coefficient decays to deficiency original 10, can burn at once
Ruin cooled part.So being badly in need of a kind of detection scheme to monitor the degree of superheat of cold drawing outlet at any time, it is ensured that it is always worked at
Two phases, once there is runaway condition, are put into shutdown programm, it is ensured that the safety of cooled part.
As shown in figure 1, the present invention is the degree of superheat detection method being applied in a kind of two-phase flow cooling system, the two-phase
Include the circulation line comprising refrigerant in flow cooling system, heat exchanger, mistake are sequentially provided with described circulation line
Filter, reservoir and cryogenic fluid pump.Temperature sensor, pressure sensor are additionally provided with described two-phase flow cooling system and is used for
The control unit of the degree of superheat is detected, described temperature sensor is arranged on system entry position in the circulation loop of refrigerant and is used to
Collecting temperature value T1, pressure sensor be arranged on refrigerant circulation loop in system entry position to gather pressure value P 1,
Simply and easily pressure value and temperature value can be acquired by the pressure sensor and temperature sensor in system, without
By detection parts such as pressure gauge and temp.-sensing wires come through row data acquisition.
Data acquisition module, controller and host computer, described data acquisition module point are provided with above-mentioned control unit
Not Lian Jie temperature sensor and pressure sensor with collecting temperature Value Data and pressure Value Data, temperature sensor and pressure sensing
The data value of device is analog quantity, and the data acquisition module is connected with A/D modular converters, and the analog data collected is by one
Individual A/D modular converters are converted to data signal, then by an I2C buses are inputted to described controller, and controller then leads to
Cross the connection of RS485 bus and input signal is to described host computer.By described control unit can to temperature value and
Pressure value is gathered in real time, without artificial uninterrupted reading, operating efficiency is lifted, while reducing the people caused by reading
For error.
Refrigerant superheat degree calculation procedure is provided with described controller, and host computer can be according to the overheat calculated
Spend to make corresponding actions.
Described refrigerant superheat degree calculation procedure includes：
1）Refrigerant saturation temperature value T1a and corresponding pressure value P1a is read according to the pressure enthalpy table of refrigerant R134a, in advance
By refrigerant saturation temperature value T1a and corresponding pressure value P1a table data storage in a control unit, include in the form full
With temperature value T1a and pressure value P 1a, and saturation temperature value and pressure value corresponded using indexing.
The pressure enthalpy table of above-mentioned refrigerant R134a is as follows：
2）Real-time pressure value P1 is obtained after being changed according to data collecting module collected and through A/D modular converters, in above-mentioned table
In find out the corresponding theoretical saturation temperature value T1a of the real-time pressure value P1, real-time pressure value P1, and by the theoretical saturation temperature
Angle value T1a data storages are got up.
3）The real-time temperature values T1 of the collection and theoretical saturation temperature value T1a that finds out is compared again, if actual temperature
Angle value T1 is higher than theoretical saturation temperature value T1a, then judges that refrigerant is in superheat state, that is to say, that when by pressing in real time
When the theoretical saturation temperature value T1a that force value P1 is calculated is less than actual temperature value T1, then it represents that now refrigerant is in overheat shape
State.The degree of superheat is that actual temperature value subtracts theoretical temperature value, i.e. real-time temperature values and the difference of theoretical saturation temperature value.It is used as reality
Example is trampled, when T1-T1a >=2 DEG C, expression system lacks refrigerant, and controller can send shutdown command and enter shutdown process.
In above-mentioned refrigerant superheat degree calculation procedure, as the technical scheme of supplement, if the real-time pressure collected
Value P1 is between two adjacent pressure values in form, then gives tacit consent to two adjacent pressure values saturation adjacent with two in form
Temperature value is linear relationship, and calculates the corresponding theoretical saturation temperature value T1a of real-time pressure value accordingly.
The degree of superheat detection method of patent of the present invention to implement process as follows：
（1）Real-time pressure value is gathered using the pressure sensor of the system entry position in refrigerant circulation loop
P1, as shown in Figure 1；
（2）Real-time temperature values are gathered using the temperature sensor of the system entry position in refrigerant circulation loop
T1, as shown in Figure 1；
（3）Real-time pressure value P1, the temperature sensor that pressure sensor is detected are detected using data acquisition module
Real-time temperature values T1 carry out signal acquisition, obtain analog signalses, and mould is carried out to collecting signal by A/D modular converters
The conversion of analog quantity and digital quantity, I is passed through by the digital quantity signal by conversion again2C buses are inputted into controller, such as Fig. 2 institutes
Show；
（4）It is provided with the controller in data computation module, the data computation module and calculates journey containing refrigerant superheat degree
Sequence, using following special algorithm, theoretical saturation temperature value T1a, a tool are calculated using the real-time pressure value P1 detected
The algorithm example of body is as follows：
Operated in as the refrigerant R134a of coolant in circulation line, the range set of its saturation temperature value is -40
℃--101℃.Wherein, with 1 DEG C for scale division value, 141 groups of temperature values are divided into, its corresponding pressure value is also 141 groups, it is possible to
Temperature value and corresponding pressure value are made into one-to-one form, pressed as described above shown in enthalpy table, and by this list data
Store in controller.Using the real-time pressure value P1 after analog-to-digital conversion, calculated by way of data search theoretical full
With temperature value T1a.It is used as special circumstances, for the pressure value within 1 DEG C of scale division value, default pressure value and saturation temperature value
Between be linear relationship, i.e., according to pressure value and the linear relationship of saturation temperature value, the real-time pressure gathered using pressure sensor
Force value calculates corresponding theoretical saturation temperature value T1a.
（5）In the controller, the real-time temperature values T1 and theoretical saturation temperature value that will be collected and after analog-to-digital conversion
T1a is compared, if the real-time temperature values T1 collected exceedes theoretical saturation temperature value T1a, judges the system as coolant
Cryogen R134a is in superheat state, and when the degree of superheat is more than 2 DEG C, now shows that system lacks refrigerant, it is necessary to rush note refrigeration
Agent；Controller can send shutdown command and the display alarm state in host computer simultaneously, and whole cooling system enters shutdown process.
By above-mentioned degree of superheat detection method, can in real time it be calculated by the progress of controller simple and fast, so as to obtain
Accurate degree of superheat numerical value, it is to avoid artificial to be calculated by complicated formula.
Certainly, it is a specific embodiment of patent of the present invention, in addition, overheat of the invention above
Degree detection method also has other similar conceptual designs and calculation.Sum it up, the degree of superheat detection method of the present invention will
Ask protection in addition to those mentioned earlier also include other it will be apparent to those skilled in the art that change and replacement.
Claims (2)
1. include in the degree of superheat detection method in a kind of two-phase flow cooling system, the two-phase flow cooling system comprising refrigeration
The circulation line of agent, is sequentially provided with reservoir, cryogenic fluid pump, heat exchanger and filter on described circulation line, its feature
It is, temperature sensor, pressure sensor and the control for detecting the degree of superheat is additionally provided with described two-phase flow cooling system
Unit processed, described temperature sensor is arranged on system entry position in the circulation loop of refrigerant and is used to collecting temperature value T1,
Pressure sensor be arranged on refrigerant circulation loop in system entry position to gather pressure value P 1；
Data acquisition module, controller and host computer are provided with described control unit, described data acquisition module connects respectively
Jointing temp sensor and pressure sensor are with collecting temperature value and pressure Value Data, and the data acquisition module is connected with A/D conversions
Module, A/D modular converters pass through I2C buses connect the data input after conversion to controller, the controller by RS485 buses
Connect described host computer；Refrigerant superheat degree calculation procedure is provided with described controller, host computer is according to the overheat of calculating
Degree makes corresponding actions；Process step in described refrigerant superheat degree calculation procedure includes：
1）Refrigerant theory saturation temperature value T1a and corresponding pressure value P1a is read according to the pressure-enthalpy chart table of refrigerant R134a, in advance
First by refrigerant saturation temperature value T1a and corresponding pressure value P1a list data storage in a control unit, the form includes
There are theoretical saturation temperature value T1a and pressure value P 1a, and saturation temperature value is corresponding using indexing with pressure value in the table；
2）The real-time pressure value obtained according to data collecting module collected and after the conversion of A/D modular converters, using above-mentioned figure
Theoretical saturation temperature value is found out in table and by data storage；
3）The real-time temperature values of collection are compared with the theoretical saturation temperature value found out, if actual temperature value is than theoretical saturation
Temperature value is high, then judges that refrigerant is in superheat state, its degree of superheat is that actual temperature value subtracts theoretical saturation temperature value；
In described refrigerant superheat degree calculation procedure, if the real-time pressure value collected is in two adjacent pressures in form
Between force value, then it is linear relationship to give tacit consent to two adjacent pressure values saturation temperature value adjacent with two in form, is calculated accordingly
Go out the corresponding theoretical saturation temperature value of real-time pressure value.
2. the degree of superheat detection method in a kind of two-phase flow cooling system according to claim 1, it is characterised in that when logical
When crossing the theoretical saturation temperature value T1a that real-time pressure value P1 calculates and being less than T1, then it represents that now refrigerant is in overheat shape
State；When T1-T1a >=2 DEG C, expression system lacks refrigerant, it is necessary to rush note refrigerant, while controller can send shutdown command
And in host computer display alarm state, cooling system enters shutdown process.
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| DE602005004310T2 (en) * | 2004-11-05 | 2009-01-02 | Arcelik Anonim Sirketi, Tuzla | COOLING DEVICE AND CONTROL PROCEDURE |
| JP4529727B2 (en) * | 2005-02-23 | 2010-08-25 | 富士電機リテイルシステムズ株式会社 | Refrigerant circuit |
| CN101901017B (en) * | 2009-05-27 | 2012-02-01 | 约克（无锡）空调冷冻设备有限公司 | Fuzzy control system and method of throttle mechanism |
| CN103673416A (en) * | 2012-08-31 | 2014-03-26 | 杭州三花研究院有限公司 | Control method for refrigerant flow quantity in automobile air conditioning system and automobile air conditioning system |
| CN103076360A (en) * | 2013-01-30 | 2013-05-01 | 长城汽车股份有限公司 | Test device for superheating degree and supercooling degree |
| JP2014190614A (en) * | 2013-03-27 | 2014-10-06 | Ebara Refrigeration Equipment & Systems Co Ltd | Turbo refrigerator |
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Address after: 201611 No.4 workshop, 1199 Xinfei Road, Songjiang District, Shanghai Patentee after: AAVID THERMALLOY LLC Patentee after: Baode South China (Shenzhen) thermal energy system Co.,Ltd. Address before: 201611 No.4 workshop, 1199 Xinfei Road, Songjiang District, Shanghai Patentee before: AAVID THERMALLOY LLC Patentee before: Aavid Shenzen Thermal Energy System Co.,Ltd. |
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Address after: 201611 No.4 workshop, 1199 Xinfei Road, Songjiang District, Shanghai Patentee after: Baode (Shanghai) Technology Co.,Ltd. Patentee after: Baode South China (Shenzhen) thermal energy system Co.,Ltd. Address before: 201611 No.4 workshop, 1199 Xinfei Road, Songjiang District, Shanghai Patentee before: AAVID THERMALLOY LLC Patentee before: Baode South China (Shenzhen) thermal energy system Co.,Ltd. |