CN102288004A - Method for controlling variable output of refrigerating capacity of compressor unit in multiple-refrigeratory refrigeration system - Google Patents
Method for controlling variable output of refrigerating capacity of compressor unit in multiple-refrigeratory refrigeration system Download PDFInfo
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- CN102288004A CN102288004A CN2011101582716A CN201110158271A CN102288004A CN 102288004 A CN102288004 A CN 102288004A CN 2011101582716 A CN2011101582716 A CN 2011101582716A CN 201110158271 A CN201110158271 A CN 201110158271A CN 102288004 A CN102288004 A CN 102288004A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 10
- 230000008676 import Effects 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 abstract description 9
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000001360 synchronised effect Effects 0.000 abstract description 2
- 230000008020 evaporation Effects 0.000 abstract 2
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Abstract
The invention relates to a method for controlling variable output of refrigerating capacity of a compressor unit in a multiple-refrigeratory refrigeration system. A programmable logical controller (PLC) operates heat exchanging load required by the system by detecting the temperature of each refrigeratory and comparing the temperature with a set temperature, and controls the compressor unit to output energy correspondingly matched with the heat exchanging load through operation according to the heat exchanging load. According to the control method, increased discharging pressure is controlled by refrigeratory load total amount, the refrigeratory load total amount is correspondingly matched with the output of the refrigerating capacity of the compressor unit, and the evaporation temperature is stable, so that relatively high refrigerating efficiency is ensured and energy consumption of the system is lowered. Due to the stable evaporation temperature, synchronous detection control is realized, and the liquid impact phenomenon caused by excessively low superheat degree can be effectively prevented.
Description
Technical field
The present invention relates to a kind of control method that is applied to the compressor bank refrigerating capacity output in many freezer refrigeratings system.
Background technology
At present, in many freezer refrigeratings system, change the variable quantity of judging the freezer load by the pressure of inspiration(Pi) that detects whole system, think that when increased pressure freezer heat exchange load increases, pressure of inspiration(Pi) is higher than compressor bank increment of load when setting the increment of load value, think that when pressure reduces freezer heat exchange load reduces, pressure of inspiration(Pi) is lower than compressor bank unloading when setting the unloading value.The major defect of this control method is, because the evaporating temperature of compressor is increased unloading pressure and is controlled, evaporating temperature is not a stable numerical value, and the too high or low excessively refrigerating efficiency to operating mode of evaporating temperature can exert an influence, and causes the increase of compressor bank energy consumption.On the other hand, what can have influence on the pace of change of back pressure because the evaporimeter of freezer is opened quantity, the detection of pressure of inspiration(Pi) can lag behind actual pressure and change, and the control that increases unloading can't be according to the variation Synchronization Control of pressure of inspiration(Pi), cause the hysteresis that increases unloading, finally caused the instability of evaporating temperature.Therefore, this control method causes a certain period degree of superheat low excessively easily, even because of the low excessively generation that causes liquid hit phenomenon of the degree of superheat, damages compressor.
Summary of the invention
Technical problem to be solved by this invention is, compressor bank refrigerating capacity variable output control method in a kind of many freezer refrigeratings system is provided, and makes system have stable evaporating temperature, and the refrigerating capacity output of evaporimeter heat exchange amount and refrigeration unit is coupling rationally.
Technical scheme of the present invention is as follows:
Compressor bank refrigerating capacity variable output control method in a kind of many freezer refrigeratings system, it is characterized in that: by comparing to the temperature detection of each freezer and with design temperature, PLC calculates the needed heat exchange load of system, according to this heat exchange load, PLC is through the energy of s operation control compressor bank output with the corresponding coupling of this heat exchange load.
Concrete control step of the present invention is as follows:
The first step: the heat exchange load of each freezer (is labeled as Q1, Q2 ... Qn) import storage in advance among the PLC respectively; And store in advance among the refrigerating capacity input PLC with compressor bank:
If compressor bank in parallel,
(1) each head has only an energy grade, stores in advance among the operating mode overall refrigerating effect input PLC with every compressor;
(2), each head has a plurality of energy grades, store in advance among the refrigerating capacity input PLC with the operating mode overall refrigerating effect of every compressor and each energy grade;
(3), each head is by VFC refrigerating capacity output, with the operating mode overall refrigerating effect of every compressor with effectively store in advance among the refrigerating capacity input PLC of output percentage;
If unit head compressor bank,
(1), head has a plurality of energy grades, store in advance among the refrigerating capacity input PLC with each energy grade of compressor;
(2), head is by VFC refrigerating capacity output, working conditions of compressor is effectively exported among the refrigerating capacity input PLC of percentage to store in advance;
Second step: the temperature (t1-tn) that detects each freezer by temperature sensor;
The 3rd step: detected temperature of ice house and setting value are compared, the control temperature is given the evaporimeter feed flow greater than liquid supply electromagnetic valve in the freezer of the design temperature upper limit, and the heat exchange of these freezers is loaded carry out add operation simultaneously, obtain total heat exchange load (Q) of these freezers;
The 4th step, unit refrigerating capacity output control:
If compressor bank in parallel,
(1) each head has only an energy grade, and PLC is according to the operating mode refrigerating capacity computing of every compressor, and the control output head corresponding with total heat exchange load (Q) opened quantity;
(2), each head has a plurality of energy grades, PLC is according to the operating mode refrigerating capacity and the computing of energy grade load of every compressor, head unlatching quantity that control output is corresponding with total heat exchange load (Q) and the energy grade of each head;
(3), each head is by VFC refrigerating capacity output, PLC is according to the operating mode refrigerating capacity computing of every compressor, head unlatching quantity corresponding with total heat exchange load (Q) of control output and the refrigerating capacity ratio of each head;
If unit head compressor bank,
(1), head has a plurality of energy grades, PLC carries out computing according to the refrigerating capacity of the operating mode effective energy grade of compressor, one of control output and total heat exchange (Q) the corresponding energy grade of loading;
(2), head is that PLC carries out computing according to the refrigerating capacity that the operating mode of compressor is effectively exported percentage by VFC refrigerating capacity output, one of control output and total heat exchange (Q) the corresponding refrigerating capacity ratio of loading;
When freezer load total amount increased, PLC reran according to said method, and carries out increment of load according to operation result, made the refrigerating capacity output of evaporimeter heat exchange amount and refrigeration unit keep coupling rationally;
When freezer load total amount reduced, PLC reran according to said method, and unloads according to operation result, made the refrigerating capacity output of evaporimeter heat exchange amount and refrigeration unit keep coupling rationally.
Good effect of the present invention is: the first, in many freezer refrigeratings system, the heat exchange of each freezer evaporimeter load is a definite value under the working condition of system requirements according to system's design.Therefore, according to control method of the present invention, increase unloading pressure and be subjected to the overall control of freezer load, freezer load total amount is exported corresponding coupling with the refrigerating capacity of compressor bank, and evaporating temperature is stable, thereby has guaranteed higher refrigerating efficiency, and has reduced system energy consumption.The second, owing to have stable evaporating temperature, realized synchronous detection control simultaneously, can effectively avoid generation because of the low excessively liquid hit phenomenon that causes of the degree of superheat.
The specific embodiment
Further specify the present invention below in conjunction with embodiment.
By comparing to the temperature detection of each freezer and with design temperature, PLC calculates the needed heat exchange load of system, and according to this heat exchange load, PLC is through the energy of s operation control compressor bank output with the corresponding coupling of this heat exchange load.
Concrete control step of the present invention is:
The first step: the heat exchange load of each freezer (is labeled as Q1, Q2 ... Qn) import storage in advance among the PLC respectively; And store in advance among the refrigerating capacity input PLC with compressor bank:
1 if compressor bank in parallel,
(1) each head has only an energy grade, stores in advance among the operating mode overall refrigerating effect input PLC with every compressor;
(2), each head has a plurality of energy grades, store in advance among the refrigerating capacity input PLC with the operating mode overall refrigerating effect of every compressor and each energy grade;
(3), each head is by VFC refrigerating capacity output, with the operating mode overall refrigerating effect of every compressor with effectively store in advance among the refrigerating capacity input PLC of output percentage;
2 if unit head compressor bank,
(1), head has a plurality of energy grades, store in advance among the refrigerating capacity input PLC with each energy grade of compressor;
(2), head is by VFC refrigerating capacity output, working conditions of compressor is effectively exported among the refrigerating capacity input PLC of percentage to store in advance;
Second step: the temperature (t1-tn) that detects each freezer by temperature sensor;
The 3rd step: detected temperature of ice house and setting value are compared, the control temperature is given the evaporimeter feed flow greater than liquid supply electromagnetic valve in the freezer of the design temperature upper limit, and the heat exchange of these freezers is loaded carry out add operation simultaneously, obtain total heat exchange load (Q) of these freezers;
The 4th step, unit refrigerating capacity output control:
1 if compressor bank in parallel,
(1) each head has only an energy grade, and PLC is according to the operating mode refrigerating capacity computing of every compressor, and the control output head corresponding with total heat exchange load (Q) opened quantity;
(2), each head has a plurality of energy grades, PLC is according to the operating mode refrigerating capacity and the computing of energy grade load of every compressor, head unlatching quantity that control output is corresponding with total heat exchange load (Q) and the energy grade of each head;
(3), each head is by VFC refrigerating capacity output, PLC is according to the operating mode refrigerating capacity computing of every compressor, head unlatching quantity corresponding with total heat exchange load (Q) of control output and the refrigerating capacity ratio of each head;
2 if unit head compressor bank,
(1), head has a plurality of energy grades, PLC carries out computing according to the refrigerating capacity of the operating mode effective energy grade of compressor, one of control output and total heat exchange (Q) the corresponding energy grade of loading;
(2), head is that PLC carries out computing according to the refrigerating capacity that the operating mode of compressor is effectively exported percentage by VFC refrigerating capacity output, one of control output and total heat exchange (Q) the corresponding refrigerating capacity ratio of loading;
When freezer load total amount increased, PLC reran according to said method, and carries out increment of load according to operation result, made the refrigerating capacity output of evaporimeter heat exchange amount and refrigeration unit keep coupling rationally;
When freezer load total amount reduced, PLC reran according to said method, and unloads according to operation result, made the refrigerating capacity output of evaporimeter heat exchange amount and refrigeration unit keep coupling rationally.
Embodiment one
In certain many freezer refrigeratings system, 5 freezers are arranged, their evaporimeter heat exchange load is respectively Q1=50KW, Q2=75KW, Q3=50KW, Q4=100KW, Q5=50KW.Total heat exchange load Q=325KW.
Compressor bank is three head parallel-screw units, the first head operating mode refrigerating capacity 80KW, effective energy social estate system cold: 50%, 75%, 100%, the second head operating mode refrigerating capacity 100KW, effective energy social estate system cold: 50%, 75%, 100%, the 3rd head operating mode refrigerating capacity 150KW, effective energy social estate system cold: 50%, 75%, 100%, refrigerating capacity is 330KW at full capacity.
Find that by temperature detection at a time, the temperature of the first, the 3rd, the 4th freezer all is higher than the setting value upper limit, PLC computing, freezer heat exchange this moment load Q=Q1 (50KW)+Q3 (50KW)+Q4 (100KW)=200KW.
According to this operation result, PLC exports unit and carries out computing, controls second head output, 50%, the three head output 100%.Thereby the refrigerating capacity output that has reached evaporimeter heat exchange amount and refrigeration unit is rationally mated.
After operation a period of time, find by temperature detection, the first, the temperature of the 3rd, the 4th, the 5th freezer all is higher than the setting value upper limit, the computing of PLC process, freezer heat exchange this moment load Q=Q1 (50KW)+Q3 (50KW)+Q4 (100KW)+Q5 (50KW)=250KW.According to this operation result, PLC exports unit and carries out computing again, controls second head output, 100%, the three head output 100%.Thereby the refrigerating capacity output that has reached evaporimeter heat exchange amount and refrigeration unit is again rationally mated.
After moving a period of time again, find that by temperature detection only the temperature of the first, the 4th freezer is higher than the setting value upper limit, the computing of PLC process, freezer heat exchange this moment load Q=Q1 (50KW)+Q4 (100KW)=150KW.According to this operation result, PLC exports unit and carries out computing again, controls second head and stops output, the 3rd head output 100%.Thereby the refrigerating capacity output that has reached evaporimeter heat exchange amount and refrigeration unit is again rationally mated.
Embodiment two
In certain many freezer refrigeratings system, 5 freezers are arranged, their evaporimeter heat exchange load is respectively Q1=50KW, Q2=75KW, Q3=50KW, Q4=100KW, Q5=50KW.
Compressor bank is two head frequency conversion units, the operating mode refrigerating capacity 150KW of first head, and the effective energy ratio is 30%-100%, the operating mode refrigerating capacity 180KW of second head, the effective energy ratio is 30%-100%, refrigerating capacity is 330KW at full capacity.
Find that by temperature detection at a time, the temperature of the first, the 3rd, the 4th freezer all is higher than the setting value upper limit, PLC computing, freezer heat exchange this moment load Q=Q1 (50KW)+Q3 (50KW)+Q4 (100KW)=200KW.
According to this operation result, PLC exports unit and carries out computing, controls first head output, 100% (150KW), second head output, 30% (54KW).Thereby the refrigerating capacity output that has reached evaporimeter heat exchange amount and refrigeration unit is rationally mated.
After operation a period of time, find by temperature detection, the first, the temperature of the 3rd, the 4th, the 5th freezer all is higher than the setting value upper limit, the computing of PLC process, freezer heat exchange this moment load Q=Q1 (50KW)+Q3 (50KW)+Q4 (100KW)+Q5 (50KW)=250KW.According to this operation result, PLC exports unit and carries out computing again, controls head output 100%, the second head output 56%.Thereby the refrigerating capacity output that has reached evaporimeter heat exchange amount and refrigeration unit is again rationally mated.
After moving a period of time again, find that by temperature detection only the temperature of the first, the 4th freezer is higher than the setting value upper limit, the computing of PLC process, freezer heat exchange this moment load Q=Q1 (50KW)+Q4 (100KW)=150KW.According to this operation result, PLC exports unit and carries out computing again, controls first head output, 100%, the second head and stops output.Thereby the refrigerating capacity output that has reached evaporimeter heat exchange amount and refrigeration unit is again rationally mated.
Claims (2)
1. compressor bank refrigerating capacity variable output control method in the freezer refrigerating system more than a kind, it is characterized in that: by comparing to the temperature detection of each freezer and with design temperature, PLC calculates the needed heat exchange load of system, according to this heat exchange load, PLC is through the energy of s operation control compressor bank output with the corresponding coupling of this heat exchange load.
2. compressor bank refrigerating capacity variable output control method in many freezer refrigeratings as claimed in claim 1 system is characterized in that specifically controlling step and is:
The first step: the heat exchange load of each freezer (is labeled as Q1, Q2 ... Qn) import storage in advance among the PLC respectively; And store in advance among the refrigerating capacity input PLC with compressor bank:
If compressor bank in parallel,
(1) each head has only an energy grade, stores in advance among the operating mode overall refrigerating effect input PLC with every compressor;
(2), each head has a plurality of energy grades, store in advance among the refrigerating capacity input PLC with the operating mode overall refrigerating effect of every compressor and each energy grade;
(3), each head is by VFC refrigerating capacity output, with the operating mode overall refrigerating effect of every compressor with effectively store in advance among the refrigerating capacity input PLC of output percentage;
If unit head compressor bank,
(1), head has a plurality of energy grades, store in advance among the refrigerating capacity input PLC with each energy grade of compressor;
(2), head is by VFC refrigerating capacity output, working conditions of compressor is effectively exported among the refrigerating capacity input PLC of percentage to store in advance;
Second step: the temperature (t1-tn) that detects each freezer by temperature sensor;
The 3rd step: detected temperature of ice house and setting value are compared, the control temperature is given the evaporimeter feed flow greater than liquid supply electromagnetic valve in the freezer of the design temperature upper limit, and the heat exchange of these freezers is loaded carry out add operation simultaneously, obtain total heat exchange load (Q) of these freezers;
The 4th step, unit refrigerating capacity output control:
If compressor bank in parallel,
(1) each head has only an energy grade, and PLC is according to the operating mode refrigerating capacity computing of every compressor, and the control output head corresponding with total heat exchange load (Q) opened quantity;
(2), each head has a plurality of energy grades, PLC is according to the operating mode refrigerating capacity and the computing of energy grade load of every compressor, head unlatching quantity that control output is corresponding with total heat exchange load (Q) and the energy grade of each head;
(3), each head is by VFC refrigerating capacity output, PLC is according to the operating mode refrigerating capacity computing of every compressor, head unlatching quantity corresponding with total heat exchange load (Q) of control output and the refrigerating capacity ratio of each head;
If unit head compressor bank,
(1), head has a plurality of energy grades, PLC carries out computing according to the refrigerating capacity of the operating mode effective energy grade of compressor, one of control output and total heat exchange (Q) the corresponding energy grade of loading;
(2), head is that PLC carries out computing according to the refrigerating capacity that the operating mode of compressor is effectively exported percentage by VFC refrigerating capacity output, one of control output and total heat exchange (Q) the corresponding refrigerating capacity ratio of loading;
When freezer load total amount increased, PLC reran according to said method, and carries out increment of load according to operation result, made the refrigerating capacity output of evaporimeter heat exchange amount and refrigeration unit keep coupling rationally;
When freezer load total amount reduced, PLC reran according to said method, and unloads according to operation result, made the refrigerating capacity output of evaporimeter heat exchange amount and refrigeration unit keep coupling rationally.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104567198A (en) * | 2014-12-29 | 2015-04-29 | 天津商业大学 | Design method for refrigerating system of multi-storeroom identical temperature refrigeration houses and refrigerating control method |
| CN104949463A (en) * | 2015-06-26 | 2015-09-30 | 四川长虹电器股份有限公司 | Accurate and efficient temperature control implement method for refrigerator |
| CN109813004A (en) * | 2019-01-28 | 2019-05-28 | 南通美吉乐制冷设备有限公司 | The robot control system(RCS) of superposition type deep cooling Parallel sets |
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| CN1769804A (en) * | 2004-11-03 | 2006-05-10 | Lg电子株式会社 | Air conditioner |
| CN201259364Y (en) * | 2008-09-12 | 2009-06-17 | 孟庆国 | Automatic control and management system for refrigerating house |
| CN101539355A (en) * | 2009-04-23 | 2009-09-23 | 上海爱控自动化设备有限公司 | Refrigeration control system capable of intelligent scheduling and method thereof |
| CN101846413A (en) * | 2010-05-26 | 2010-09-29 | 南车株洲电力机车有限公司 | Unitary air-conditioning unit of subway vehicle and control method thereof |
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2011
- 2011-06-14 CN CN2011101582716A patent/CN102288004A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1769804A (en) * | 2004-11-03 | 2006-05-10 | Lg电子株式会社 | Air conditioner |
| CN201259364Y (en) * | 2008-09-12 | 2009-06-17 | 孟庆国 | Automatic control and management system for refrigerating house |
| CN101539355A (en) * | 2009-04-23 | 2009-09-23 | 上海爱控自动化设备有限公司 | Refrigeration control system capable of intelligent scheduling and method thereof |
| CN101846413A (en) * | 2010-05-26 | 2010-09-29 | 南车株洲电力机车有限公司 | Unitary air-conditioning unit of subway vehicle and control method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104567198A (en) * | 2014-12-29 | 2015-04-29 | 天津商业大学 | Design method for refrigerating system of multi-storeroom identical temperature refrigeration houses and refrigerating control method |
| CN104949463A (en) * | 2015-06-26 | 2015-09-30 | 四川长虹电器股份有限公司 | Accurate and efficient temperature control implement method for refrigerator |
| CN109813004A (en) * | 2019-01-28 | 2019-05-28 | 南通美吉乐制冷设备有限公司 | The robot control system(RCS) of superposition type deep cooling Parallel sets |
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Application publication date: 20111221 |