CN106369772B - A kind of method for security protection of central air conditioning cooling water system variable-flow operation - Google Patents
A kind of method for security protection of central air conditioning cooling water system variable-flow operation Download PDFInfo
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- CN106369772B CN106369772B CN201610987320.XA CN201610987320A CN106369772B CN 106369772 B CN106369772 B CN 106369772B CN 201610987320 A CN201610987320 A CN 201610987320A CN 106369772 B CN106369772 B CN 106369772B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
- F24F11/58—Remote control using Internet communication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/40—Pressure, e.g. wind pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of method for security protection of central air conditioning cooling water system variable-flow operation, including central processing unit, communication module and refrigerating module, by using heat exchange amount balanced protection, the protection of cooling water low discharge, four kinds of guard methods such as cooling water leaving water temperature high temperature protection and centrifuge surge protection, operation is acquired to data by central processing unit and chilled water pump and cooling water pump are controlled and detected by communication module, in cooling water cooling capacity < chilled water cold amount+water cooler operation energy consumption, when the water flow of cooling water pump is lower than minimum flow, when cooling water is discharged when high temperature is higher than limit value or condenser pressure and evaporator pressure pressure difference are more than setting limit value, cooling water flow is increased in time, to avoid influencing water cooler operation, have the function that the safeguard protection of central air conditioning cooling water system variable-flow operation , play effective energy-efficient purpose.
Description
Technical field
The present invention relates to central air-conditioning energy technical field, especially a kind of central air conditioning cooling water system variable-flow operation
Method for security protection.
Background technique
With the development of economy, the use occasion of central air-conditioning is more and more, and energy consumption constantly rises, to the electric power of each place
Supply brings very big pressure.So the energy conservation of central air conditioner system becomes more and more important.
Also come into being for the vari- able flow control of central air conditioner system, by tail end air conditioner unit and chilled water pump,
Achieve the effect that good, has gradually also been applied on cooling water system in recent years, but there are some problems and disputes, especially
Influence of the Variable Cooling Water Flow amount for water cooler performance and safety is always the emphasis of arguement.
Summary of the invention
The purpose of the present invention is to provide a kind of method for security protection of central air conditioning cooling water system variable-flow operation, tools
There is good Energy Saving Control effect, to solve the problems mentioned in the above background technology.
To achieve the above object, the invention provides the following technical scheme: a kind of central air conditioning cooling water system, including center
Processor, communication module and refrigerating module, the central processing unit are arranged in tail end air conditioner unit, central processing unit with communicate
Module carries out signal connection；The communication module includes PROFIBUS network, communication gate and MODBUS network, central processing unit
It is connected by PROFIBUS Networks and Communications gateway, communication gate carries out signal connection by MODBUS network and refrigerating module；
The refrigerating module is arranged in refrigeration machine and blower fan of cooling tower, and one end of refrigeration machine is circumscribed with chilled water pump by pipeline, cold
The other end for freezing water pump is plugged on tail end air conditioner unit by pipeline；The other end of the refrigeration machine is also communicated with cooling water
Pump, the other end of cooling water pump are plugged in blower fan of cooling tower by pipeline, and fan frequency converter is provided in blower fan of cooling tower；Institute
It states and is additionally provided with water supply pump frequency converter in cooling water pump and chilled water pump, water supply pump frequency converter and fan frequency converter pass through MODBUS
Communication gate in Networks and Communications module is electrically connected；It is also set up at the Inlet and outlet water port of the cooling water pump and chilled water pump
There is sensor, the central processing unit in sensor and tail end air conditioner unit is electrically connected.
A kind of method for security protection of central air conditioning cooling water system variable-flow operation, including it is heat exchange amount balanced protection, cold
But the protection of water low discharge, cooling water leaving water temperature high temperature protection and centrifuge surge protection, the principle is as follows:
Heat exchange amount balanced protection: can be obtained by central air conditioning cooling water system, cooling Water transport heat=tail end air conditioner unit
(4) heat exchange amount+water cooler operation energy consumption detects chilled-water flow, chilled water supply and return water temperature, cooling by sensor (11)
Water cooling amount and cooling water inlet and outlet temperature, and chilled water cold amount and cooling water cooling capacity are calculated by central processing unit (1), if cooling
Water cooling amount < chilled water cold amount+water cooler operation energy consumption, Ying Jia great cooling water flow；
The protection of cooling water low discharge: can be obtained by central air conditioning cooling water system, to guarantee the condensation utensil in refrigeration machine (5)
There is preferable heat transfer effect, by setting different water cooler cooling water minimum flows, is being lower than minimum flow, cooling should be increased
Water flow；
Cooling water leaving water temperature high temperature protection: it can be obtained by central air conditioning cooling water system, cold in-water temperature was by that time
Outdoor wet-bulb temperature and cooling tower heat exchange property determine, by setting cooling water be discharged high temperature limit value, be higher than limit value, Ying Jia great
Cooling water flow；
Centrifuge surge protection: can be obtained by central air conditioning cooling water system, cold by condensing pressure sensor real-time detection
Condenser pressure and evaporator pressure, the water supply pump frequency converter (9) when the two pressure difference is more than setting limit value, in cooling water pump (8)
Not frequency reducing or raising frequency, to guarantee that water cooler does not enter surge area.
As a further solution of the present invention: the sensor includes flow sensor, temperature sensor, cooling capacity sensor
With condensing pressure sensor, and condensing pressure sensor is arranged in the condenser of refrigeration machine.
As a further solution of the present invention: PROFIBUS network and MODBUS network in the communication module are existing
Communications protocol mode can be replaced by other standards network communication protocol.
As a further solution of the present invention: cooling tower heat transfer temperature difference=cold in-water temperature-outdoor wet-bulb temperature；It is cold
But water passes in and out water temperature difference=cooling water leaving water temperature-cold in-water temperature；Condenser heat transfer temperature difference=condensation temperature-cooling water
Leaving water temperature.
Compared with prior art, the invention has the advantages that:
The method for security protection of this central air conditioning cooling water system variable-flow operation, by using heat exchange amount balanced protection,
Four kinds of guard methods such as the protection of cooling water low discharge, cooling water leaving water temperature high temperature protection and centrifuge surge protection, by center
Processor is acquired operation to data and chilled water pump and cooling water pump is controlled and detected by communication module, cold
But when water cooling amount < chilled water cold amount+water cooler operation energy consumption, when the water flow of cooling water pump is lower than minimum flow, cooling water
It is discharged when high temperature is higher than limit value or when condenser pressure and evaporator pressure pressure difference are more than setting limit value, increases cooling water flow in time
Amount has the function that the safeguard protection of central air conditioning cooling water system variable-flow operation to avoid influencing water cooler operation,
Play effective energy-efficient purpose.
Detailed description of the invention
Fig. 1 is system block diagram of the invention；
Fig. 2 is the working principle of the invention figure；
Fig. 3 is water cooler cold side heat transfer temperature difference schematic diagram of the invention.
In figure: 1- central processing unit；2- communication module；21-PROFIBUS network；22- communication gate；23-MODBUS net
Network；3- refrigerating module；4- tail end air conditioner unit；5- refrigeration machine；6- blower fan of cooling tower；7- chilled water pump；8- cooling water pump；9- is cold
Pump variable frequency device；10- fan frequency converter；11- sensor.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Please refer to Fig. 1-3, in the embodiment of the present invention, a kind of central air conditioning cooling water system, including it is central processing unit 1, logical
Believe that module 2 and refrigerating module 3, central processing unit 1 are arranged in tail end air conditioner unit 4, central processing unit 1 is used for external load
And data carry out signal processing, to facilitate the progress of follow-up work；Central processing unit 1 and communication module 2 carry out signal connection, lead to
Believe that module 2 includes PROFIBUS network 21, communication gate 22 and MODBUS network 23, the PROFIBUS network in communication module 2
21 and MODBUS network 23 is existing communication agreement mode, can also be replaced by other standards network communication protocol, central processing
Device 1 is connect by PROFIBUS network 21 with communication gate 22, communication gate 22 in communication module 2 at least provided with one,
Communication gate 22 carries out signal connection by MODBUS network 23 and refrigerating module 3；The setting of refrigerating module 3 is in refrigeration machine 5 and cold
But in tower blower 6, one end of refrigeration machine 5 is circumscribed with chilled water pump 7 by pipeline, and the other end of chilled water pump 7 is inserted by pipeline
It connects on tail end air conditioner unit 4；The other end of refrigeration machine 5 is also communicated with cooling water pump 8, and the other end of cooling water pump 8 passes through pipe
Road is plugged in blower fan of cooling tower 6, and fan frequency converter 10 is provided in blower fan of cooling tower 6, and fan frequency converter 10 is cold for controlling
But in tower blower 6 motor operation；Water supply pump frequency converter 9, cold water pump frequency conversion are additionally provided in cooling water pump 8 and chilled water pump 7
Device 9 is used to adjust the working condition of chilled water pump 7 and cooling water pump 8, and water supply pump frequency converter 9 and fan frequency converter 10 pass through
Communication gate 22 on MODBUS network 23 and communication module 2 is electrically connected；In the Inlet and outlet water of cooling water pump 8 and chilled water pump 7
Sensor 11 is additionally provided at port, sensor 11 includes flow sensor, temperature sensor, cooling capacity sensor and condensing pressure
Sensor, and condensing pressure sensor is arranged in the condenser of refrigeration machine 5, the output end and tail end air conditioner unit of sensor 11
Central processing unit 1 in 4 is electrically connected, and receives each cooling component data information by central processing unit 1, and carry out signal to it
Processing rationally controls communication module 2, and communication module 2 controls cooling water pump 8 and chilled water pump 7 works, and plays to central air-conditioning cold
But water system rationally controls energy-efficient purpose.
A kind of method for security protection of central air conditioning cooling water system variable-flow operation, including it is heat exchange amount balanced protection, cold
But the protection of water low discharge, cooling water leaving water temperature high temperature protection and centrifuge surge protection, the principle is as follows:
Heat exchange amount balanced protection: can be obtained by central air conditioning cooling water system, cooling Water transport heat=tail end air conditioner unit 4
Heat exchange amount+water cooler operation energy consumption detects chilled-water flow, chilled water supply and return water temperature, cooling water cooling by sensor 11
Amount and cooling water inlet and outlet temperature, and chilled water cold amount and cooling water cooling capacity are calculated by central processing unit 1, if cooling water cooling capacity
< chilled water cold amount+water cooler operation energy consumption increases cooling water flow, reaches heat exchange amount balance by adjusting cooling water pump 8
The purpose of protection.
The protection of cooling water low discharge: can be obtained by central air conditioning cooling water system, to guarantee that the condenser in refrigeration machine 5 has
Preferable heat transfer effect, cooling water should keep turbulent condition in condenser, and current many brand water coolers are able to achieve cooling capacity
Automatic adjustment, condenser can change between the 50%~100% of metered flow, pass through the different water cooler cooling waters of setting
Minimum flow when the water flow of cooling water pump 8 is lower than minimum flow, increases cooling water flow by the control of central processing unit 1,
To achieve the purpose that cooling water low discharge is protected.
Cooling water leaving water temperature high temperature protection: can be obtained by central air conditioning cooling water system, within a certain period of time, cooling water
Inflow temperature by that time outdoor wet-bulb temperature and cooling tower heat exchange property determine that condenser can not be controlled, cooling tower heat exchange temperature
Difference=cold in-water temperature-outdoor wet-bulb temperature；Cooling water passes in and out water temperature difference=cooling water leaving water temperature-cooling water water inlet temperature
Degree；Condenser heat transfer temperature difference=condensation temperature-cooling water leaving water temperature；So condensation temperature is determined by cooling water leaving water temperature,
Cooling water leaving water temperature is higher, and condensation temperature is higher, and the excessively high water cooler energy consumption that will lead to of condensation temperature increases, influences the operation longevity
Life, it is excessively high seriously to will lead to compressor exhaust temperature, influences oil, and setting cooling water is discharged high temperature limit value, is higher than limit value, Ying Jia
Big cooling water flow avoids influencing water cooler operation.
Centrifuge surge protection: can be obtained by central air conditioning cooling water system, cold by condensing pressure sensor real-time detection
Condenser pressure and evaporator pressure, and central processing unit 1 is transferred data to, data processing is carried out by central processing unit 1, when two
When person's pressure difference is more than setting limit value, the 9 not frequency reducing of water supply pump frequency converter or raising frequency in cooling water pump 8, to guarantee water cooler
Do not enter surge area, achievees the effect that centrifuge surge protection.
In summary: the method for security protection of this central air conditioning cooling water system variable-flow operation, by using heat exchange amount
Four kinds of protection sides such as balanced protection, the protection of cooling water low discharge, cooling water leaving water temperature high temperature protection and centrifuge surge protection
Method is acquired operation to data by central processing unit 1 and is controlled by communication module 2 to chilled water pump 7 and cooling water pump 8
System and detection, in cooling water cooling capacity < chilled water cold amount+water cooler operation energy consumption, the water flow of cooling water pump 8 is lower than minimum
When flow, when cooling water water outlet high temperature is higher than limit value or when condenser pressure and evaporator pressure pressure difference are more than setting limit value, and
Shi Jia great cooling water flow reaches central air conditioning cooling water system variable-flow operation to avoid influencing water cooler operation
Effective energy-efficient purpose is played in the effect of safeguard protection.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (5)
1. a kind of method for security protection of central air conditioning cooling water system variable-flow operation, including heat exchange amount balanced protection, cooling
The protection of water low discharge, cooling water leaving water temperature high temperature protection and centrifuge surge protection, the principle is as follows: heat exchange amount balance is protected
Shield: can be obtained by central air conditioning cooling water system, cooling Water transport heat=tail end air conditioner unit (4) heat exchange amount+water cooler fortune
Row energy consumption detects chilled-water flow, chilled water supply and return water temperature, cooling water cooling capacity and cooling water Inlet and outlet water by sensor (11)
Temperature, and chilled water cold amount and cooling water cooling capacity are calculated by central processing unit (1), if if cooling water cooling capacity cooling water cooling capacity
< chilled water cold amount+water cooler operation energy consumption, Ying Jia great cooling water flow；
Cooling water low discharge protection: can be obtained by central air conditioning cooling water system, for guarantee refrigeration machine (5) in condenser have compared with
Good heat transfer effect is being lower than minimum flow, should increase cooling water flow by setting different water cooler cooling water minimum flows
Amount；
Cooling water leaving water temperature high temperature protection: can be obtained by central air conditioning cooling water system, and cold in-water temperature is by room at that time
Outer wet-bulb temperature and cooling tower heat exchange property determine, are discharged high temperature limit value by setting cooling water, are higher than limit value, should increase cooling
Water flow；
Centrifuge surge protection: can be obtained by central air conditioning cooling water system, pass through condensing pressure sensor real-time detection condenser
Pressure and evaporator pressure, when the two pressure difference is more than setting limit value, the water supply pump frequency converter (9) in cooling water pump (8) does not drop
Frequency or raising frequency, to guarantee that water cooler does not enter surge area.
2. a kind of method for security protection using a kind of central air conditioning cooling water system variable-flow operation described in claim 1 carries out
The central air conditioning cooling water system of operation, including central processing unit (1), communication module (2) and refrigerating module (3), feature exists
In: in tail end air conditioner unit (4), central processing unit (1) and communication module (2) carry out letter for central processing unit (1) setting
Number connection；The communication module (2) includes PROFIBUS network (21), communication gate (22) and MODBUS network (23), center
Processor (1) is connect by PROFIBUS network (21) with communication gate (22), and communication gate (22) passes through MODBUS network
(23) signal connection is carried out with refrigerating module (3)；The refrigerating module (3) is arranged in refrigeration machine (5) and blower fan of cooling tower (6)
Interior, one end of refrigeration machine (5) is circumscribed with chilled water pump (7) by pipeline, and the other end of chilled water pump (7) is plugged on by pipeline
On tail end air conditioner unit (4)；The other end of the refrigeration machine (5) is also communicated with cooling water pump (8), cooling water pump (8) it is another
End is plugged in blower fan of cooling tower (6) by pipeline, is provided with fan frequency converter (10) in blower fan of cooling tower (6)；The cooling
It is additionally provided with water supply pump frequency converter (9) in water pump (8) and chilled water pump (7), water supply pump frequency converter (9) and fan frequency converter (10)
It is electrically connected by the communication gate (22) on MODBUS network (23) and communication module (2)；The cooling water pump (8) and freezing
It is additionally provided at the Inlet and outlet water port of water pump (7) sensor (11), the centre in sensor (11) and tail end air conditioner unit (4)
Device (1) is managed to be electrically connected.
3. a kind of central air conditioning cooling water system according to claim 2, it is characterised in that: the sensor (11) includes
Flow sensor, temperature sensor, cooling capacity sensor and condensing pressure sensor, and condensing pressure sensor is arranged in refrigeration machine
(5) in condenser.
4. a kind of central air conditioning cooling water system according to claim 2, it is characterised in that: in the communication module (2)
PROFIBUS network (21) and MODBUS network (23) be existing communication agreement mode, can be assisted by other standards network communication
View replaces.
5. a kind of method for security protection of central air conditioning cooling water system variable-flow operation according to claim 1, special
Sign is: cooling tower heat transfer temperature difference=cold in-water temperature-outdoor wet-bulb temperature；Cooling water disengaging water temperature difference=cooling water goes out
Coolant-temperature gage-cold in-water temperature；Condenser heat transfer temperature difference=condensation temperature-cooling water leaving water temperature.
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| CN201610987320.XA CN106369772B (en) | 2016-11-07 | 2016-11-07 | A kind of method for security protection of central air conditioning cooling water system variable-flow operation |
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| CN201610987320.XA CN106369772B (en) | 2016-11-07 | 2016-11-07 | A kind of method for security protection of central air conditioning cooling water system variable-flow operation |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106989478B (en) * | 2017-02-24 | 2020-02-14 | 深圳达实智能股份有限公司 | Isobaric frequency conversion control method and device applied to large and small parallel chilled water pumps in hospital |
| CN109213229A (en) * | 2017-07-07 | 2019-01-15 | 深圳市辉宏技术有限公司 | A kind of HTM control method for improving efficiency, apparatus and system |
| CN108332371A (en) * | 2018-01-12 | 2018-07-27 | 深圳市奥宇节能技术股份有限公司 | A kind of control method and device of air-conditioning high temperature and pressure |
| CN109269037A (en) * | 2018-10-09 | 2019-01-25 | 珠海格力电器股份有限公司 | control method and device of air conditioning system |
| CN110207317A (en) * | 2019-05-13 | 2019-09-06 | 天津市始祖鸟网络科技有限公司 | A kind of energy-saving control method for central air conditioner, device |
| CN112833611A (en) * | 2021-01-22 | 2021-05-25 | 深圳市奥宇节能技术股份有限公司 | Cooling circulating water system and control method thereof |
| CN114440410B (en) * | 2022-02-14 | 2023-09-08 | 深圳嘉力达节能科技有限公司 | Variable flow control method for freezing and cooling water pump based on heat exchange efficiency |
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