CN106931544A - Energy-saving central air conditioner automatic control system - Google Patents

Energy-saving central air conditioner automatic control system Download PDF

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Publication number
CN106931544A
CN106931544A CN201710183085.5A CN201710183085A CN106931544A CN 106931544 A CN106931544 A CN 106931544A CN 201710183085 A CN201710183085 A CN 201710183085A CN 106931544 A CN106931544 A CN 106931544A
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China
Prior art keywords
temperature
controller
automatic control
cooling water
air conditioner
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Pending
Application number
CN201710183085.5A
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Chinese (zh)
Inventor
汪兴轩
孙德敏
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Fudan University
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Fudan University
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Priority to CN201710183085.5A priority Critical patent/CN106931544A/en
Publication of CN106931544A publication Critical patent/CN106931544A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • 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
    • 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
    • F24F11/62—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
    • F24F11/63—Electronic processing
    • 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
    • F24F11/85—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 using variable-flow pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

Abstract

The invention belongs to automatic air conditionning technical field, specially a kind of energy-saving central air conditioner automatic control system.Central air conditioner system includes host computer system, freezing water circulation system, terminal temperature system and four subsystems etc. cooling water recirculation system；Central air conditioner automatic control system of the invention, also using PLC, frequency converter, evaporation and some meter speciallies and conventional instrument in condensation, adds with PID regulatory function controllers, forms the following close loop control circuit with dynamical feedback function：（1）Chilled water temperature automatic control loop,（2）End room temperature automatic control loop,（3）Cooling water temperature automatic control loop.When central air conditioner system load changes, there is the close loop control circuit of dynamical feedback function more than, by automatically adjusting the working condition of equipment, energy conservation object can be realized on the premise of end room cryogenic temperature demand is met.

Description

Energy-saving central air conditioner automatic control system
Technical field
The invention belongs to automatic air conditionning technical field, and in particular to central air conditioner automatic control system.
Background technology
Central air conditioner system be widely used to industry and civil area, such as hotel, hotel, office building, market, hospital, Modernization industry factory building etc..Relative to the process industrial such as petrochemical industry, electric power, steel field, central air-conditioning control technology still has The space being substantially improved.For a long time, central air conditioner system is run still under traditional mode mostly, environment temperature and air-conditioning reality When usable floor area changes, motor is all fixed on full speed running under power frequency state, causes very big energy waste.In recent years, This problem has caused the extensive concern of domestic and international refrigerating industry circle and academia, using universal frequency converter to central air conditioner system In water pump and blower fan etc. be controlled, can to a certain extent save the energy consumption of the motors such as water pump and blower fan.But, due to planting Kind of reason, is greatly open loop, manually using the motor of frequency converter, is still reached to less than due power savings.
In the process industrial such as petrochemical industry, electric power, steel field, control computer generally employs general DCS （Dcs）、PLC（Programmable logic controller (PLC)）、FCS（Field bus control system）Or special complete control dress Put；It is more how control function is realized based on meter specially mechanism and air-conditioning, refrigeration plant system are controlled.Air-conditioning, refrigeration Still in DDC on system control hardware（Direct data control）In the instrument stage, from control method, generally use both at home and abroad PID regulator, and wideling popularize Dynamic matrix control and optimisation technique application；And operation of air conditioning systems control is still in PID The stage that regulation is all used seldom.
The content of the invention
It is an object of the invention to provide the good central air conditioner automatic control system of a kind of operation power consumptive province, control effect.
In the present invention, central air conditioner system, as shown in figure 1, including host computer system, freezing water circulation system, terminal temperature Four subsystems such as system and cooling water recirculation system.Wherein, host computer system is by compressor, evaporator, splash swollen valve and condensation Device connects composition and connects successively；Cooling water recirculation system is sequentially connected by water pump, cooling device, condenser and constituted；Chilled water cyclic system System is sequentially connected by a series of coil pipes in chilled water pump, evaporator and constituted；Terminal temperature system include it is a series of respectively with respectively The blower fan and corresponding room of coil pipe connection.
Cold wind is sent into each room in end by cryogenic freezing water by coil pipe and blower fan, reaches the effect of refrigeration cool-down.Together When, freeze cycle coolant-temperature gage has been raised.Afterwards, recirculated water is pumped to the evaporator coil of host computer system by chilled water pump In, indirect heat exchange is carried out with refrigerant, cryogenic freezing water is become again.Refrigerant in host computer system discharges within the condenser Heat, the cooled circulation of heat of its release is taken away.Freezing water circulation system, cooling water recirculation system are main frame systems The servo system of system.When host computer system load changes, the demand to chilled water, cooling water also can automatically become Change.
The present invention is by using PLC, frequency converter, evaporation and some meter speciallies and conventional instrument in condensation, adding and carrying PID regulatory functions and Dynamic matrix control and the controller of optimization function, form the following closed-loop control with dynamical feedback function and return Road：（1）Chilled water temperature automatic control loop,（2）End room temperature automatic control loop,（3）Cooling water temperature is controlled automatically Loop processed.Each automatic control loop includes parameter detection device, computer based controller and corresponding performs device Deng, it is ensured that system even running, on the premise of refrigeration demand is met, the energy consumption in each link is reduced, wherein：
（1）Chilled water temperature automatic control loop, its control block diagram is as shown in Figure 2.The control loop is by chilled water return water temperature Detection means, temperature controller, chilled water water circulating pump frequency converter, freezing water circular flow detection means are sequentially connected composition； The return water temperature value for detecting is compared with set temperature value, and the input of comparative result as temperature controller is believed Number；Temperature controller, by certain control algolithm, obtains the defeated of controller according to current input signal and history input signal Go out；The output signal automatically adjusts the rotating speed of water pump, and then adjust cold as the input of chilled water water circulating pump front end frequency converter Freeze the flow of water.If there is corresponding change in the temperature after the change of flow causes chilled water to carry out heat exchange to dry coil pipe, so that Reach the effect that return water temperature is automatically controlled.During temperature controller is designed, take into full account the state of coiler fan with Influence of the ambient air temperature to return water temperature, it is ensured that the Control platform of circuit system.Controller can use regulatory PID control plan Slightly, Advanced Control Strategies are used also dependent on Control performance standard requirement；
（2）End room temperature automatic control loop, its control block diagram is as shown in Figure 3.The control loop is detected by room temperature Device, temperature controller, coiler fan rotational speed regulation executing agency, fan rotation speed detecting device are sequentially connected composition.Detection To end room temperature value be compared with setting value, and using comparative result as controller input signal；Controller root According to current input signal and history input signal, by certain control algolithm, the output of controller is obtained；Controller output letter Number as coiler fan rotational speed regulation executing agency input, the rotating speed of blower fan is automatically adjusted, so as to adjust the temperature in end room Degree.In this loop, controller design takes into full account chilled water temperature in freeze cycle water system with flow to end room The influence of temperature, it is ensured that the dynamic of this circuit system and static cost control quality.Controller can use regulatory PID control strategy, Advanced Control Strategies can be used according to Control performance standard requirement.The parameter determination of PID control or Advanced Control Strategies can basis The model parameter of each link of system, by theoretical analysis and calculation, and obtains after system operation scene is debugged repeatedly；
（3）Cooling water temperature automatic control loop, its control block diagram is as shown in Figure 4.The control loop is by going out condenser cooling water Temperature-detecting device, enter condenser cooling water temperature-detecting device, controller, cooling water circulation pump variable frequency device, cooling water and follow Circulation amount detecting device, blower fan of cooling tower Rotating speed measring, the detection of cooling tower ambient air temperature（For ground-source heat pump central air-conditioning System, without cooling tower, corresponding rotation speed of fan and ambient air temperature are without detection for cooling device）Etc. being sequentially connected composition. The condenser cooling water temperature value that goes out for detecting is compared with setting value, using comparative result as controller input signal； Controller, by certain control algolithm, obtains the output of controller according to current input signal and history input signal；Control Device output signal automatically adjusts the rotating speed of water pump as the input of cooling water circulation pump variable frequency device, so as to adjust out condenser The temperature of cooling water.In this control loop, controller design needs to take into full account in cooling circulating water system enters condenser Influence of the cooling water temperature to system, it is ensured that the dynamic of control loop system and static cost control quality.Controller can be using conventional PID control strategy, Advanced Control Strategies are used also dependent on Control performance standard requirement.PID control or Advanced Control Strategies Parameter determination according to the model parameter of each link of system, by theoretical analysis and calculation, and can repeatedly be debugged at system operation scene After obtain.
When central air conditioner system load changes, there is the close loop control circuit of dynamical feedback function more than, , by automatically adjusting the working condition of equipment, energy-conservation can be realized on the premise of end room cryogenic temperature demand is met.Tool For body：
For chilled water temperature automatic control loop, when system loading changes, to ensure end room, it is necessary to certainly Dynamic regulation Cryogenic air flow, so as to have influence on the return water temperature of freeze cycle water.To keep room temperature constant, control loop can lead to Cross the rotating speed for automatically controlling chilled water pump, thus automatically control the flow of chilled water, refrigerating water pump motor is adapted to load automatically Change and keep freezing return water temperature constant, it is not necessary to pump motor is constantly in full load condition, so as to economize on electricity.
For end room temperature automatic control loop, according to the refrigeration demand in end room, when external environment becomes During change, control loop can automatically adjust the rotating speed of coiler fan, it is not necessary to be constantly in the state of operating at full capacity, so as to economize on electricity.
For cooling water temperature automatic control loop, when central air conditioner system load changes, control loop can lead to The cooling water temperature for automatically adjusting out condenser is crossed, cooling water flow is changed automatically, cooling water circulation water pump is located always In the state of operating at full capacity, so as to economize on electricity.
Brief description of the drawings
Fig. 1 is that central air conditioner system constitutes structural representation.
Fig. 2 is chilled water temperature control loop block diagram.
Fig. 3 is end room temperature control loop block diagram.
Fig. 4 is cooling water temperature control loop block diagram.
Specific embodiment
Central air conditioning system proposed by the present invention, the control loop instrument being related to includes：Chilled water temperature sensor, End room temperature sensor, cooling-water temperature sensor, chilled water flow quantity sensor, cooling water flow sensor, controller （The PID controller realized based on PLC or the advanced algorithm controller based on industrial computer）, motor inverter etc..Specific embodiment party Formula is：（1）In chilled water temperature automatic control loop, return water temperature detected value and setting value（The value can be by optimized algorithm Be given）After comparing, controller is sent into.Before control loop input automatic running, according to the model that System Discrimination is obtained, design The parameter of PID controller.In control loop commissioning phase, controller parameter is made again according to actual control performance accordingly to repair Positive justification.Model Distinguish can not also be carried out to system, it is such as critical using practical tuning method directly in commissioning phase Proportional band method, attenuation curve method etc. obtain the parameter of controller.Control loop input automatic running after, controller according to currently and History is input into, and obtains controller output, the rotating speed of freeze cycle water pump is automatically adjusted by frequency converter, and then adjust chilled water Flow, the effect of return water temperature is automatically controlled so as to reach, and realizes the energy-conservation of freezing water circulation system.Realized in PID controller On the basis of loop automatically controls, Dynamic matrix control such as predictive control strategy can also be used, realize that the performance of control system enters one Step is improved.
Implementation process with chilled water temperature automatic control loop is similar,（2）End room temperature is automatically controlled back Lu Zhong, after end room temperature detected value compares with setting value, sends into this loop control unit.Automatic running is put into control loop Before, the model for being obtained according to System Discrimination, the parameter of PID controller is obtained by Theoretical Design.In commissioning phase, root Factually border control performance carries out corresponding amendment adjustment to controller parameter again.Also can directly in commissioning phase, using engineering Setting method, such as critical proportional band law, attenuation curve method obtain controller parameter.After control loop input automatic running, Controller obtains controller output according to the input of current and history, and the rotating speed of coiler fan is automatically adjusted by frequency converter, and then Regulation chilled water and the Cooling capacity exchanging in end room, reach the effect for automatically adjusting end room temperature, realize terminal temperature system The energy-conservation of system.On the basis of PID controller realizes that loop automatically controls, Dynamic matrix control such as predictive control strategy can also be used Deng realizing that the performance of control system is further improved.
（3）In cooling water temperature automatic control loop, go out after condenser cooling water temperature detection value compares with setting value, Feeding loop control unit.For the cooling water recirculation system using water source medium, controller is automatically adjusted latent by frequency converter Pump rotary speed, and then the heat exchange of water source and host computer system condenser is adjusted, realize automatically adjusting for return water temperature.For Using the cooling recirculation system of cooling tower device, increase blower fan of cooling tower speed detector, ambient air temperature detection means, Blower fan of cooling tower control device, takes in as the feedforward disturbance quantity of this control loop, to improve the Control platform in loop. Before control loop input automatic running, according to System identification model, the parameter of PID controller is obtained by Theoretical Design. Commissioning phase, corresponding amendment adjustment is carried out according to actual control performance to controller parameter again.Also directly can be transported in debugging Row order section, using practical tuning method, such as critical proportional band law, attenuation curve method determines controller parameter.In control loop After input automatic running, controller obtains controller output according to the input of current and history, and cooling is automatically adjusted by frequency converter The rotating speed of water pump, and then the flow of cooling water is adjusted, the effect for automatically adjusting out condenser cooling water temperature is reached, realize cooling The energy-conservation of water circulation system.On the basis of PID controller realizes that loop automatically controls, can also be using Dynamic matrix control as predicted Control strategy etc., realizes that the performance of this loop control system is further improved.

Claims (2)

1. a kind of energy-saving central air conditioner automatic control system, central air conditioner system include host computer system, freezing water circulation system, Four subsystems such as terminal temperature system and cooling water recirculation system；Wherein, host computer system by compressor, evaporator, splash it is swollen Valve and condenser connect composition and connect successively；Cooling water recirculation system is sequentially connected by water pump, cooling device, condenser and constituted；Freezing Water circulation system is sequentially connected by a series of coil pipes in chilled water pump, evaporator and constituted；Terminal temperature system includes a series of The blower fan and corresponding room for being connected with each coil pipe respectively；It is characterized in that：
Also using PLC, frequency converter, evaporation and some meter speciallies and conventional instrument in condensation, add with PID regulatory function controls Device processed, forms the following close loop control circuit with dynamical feedback function：（1）Chilled water temperature automatic control loop,（2）End Room temperature automatic control loop,（3）Cooling water temperature automatic control loop；Wherein：
（1）Chilled water temperature automatic control loop, by chilled water return water temperature detection means, temperature controller, freezing water circulation Pump variable frequency device, freezing water circular flow detection means are sequentially connected composition；The return water temperature value and design temperature that detect Value is compared, and using comparative result as temperature controller input signal；Temperature controller according to current input signal with History input signal, by certain control algolithm, obtains the output of temperature controller；The output signal is used as freezing water circulation The input of water pump front end frequency converter, automatically adjusts the rotating speed of water pump, and then adjust the flow of chilled water；
（2）End room temperature automatic control loop, is adjusted by room temperature detection means, temperature controller, coiler fan rotating speed Section executing agency, fan rotation speed detecting device are sequentially connected composition；The end room temperature value for detecting is carried out with setting value Compare, and using comparative result as temperature controller input signal；Temperature controller is defeated with history according to current input signal Enter signal, by certain control algolithm, obtain the output of temperature controller；Temperature controller output signal is used as coiler fan The input of rotational speed regulation executing agency, automatically adjusts the rotating speed of blower fan, so as to adjust the temperature in end room；
（3）Cooling water temperature automatic control loop, by going out condenser cooling water temperature-detecting device, entering condenser cooling water temperature Detection means, controller, cooling water circulation pump variable frequency device, cooling water circulation flow detector, the inspection of blower fan of cooling tower rotating speed Survey, the detection of cooling tower ambient air temperature is sequentially connected composition；Go out condenser cooling water temperature value and setting value what is detected Compare, using comparative result as controller input signal；Controller leads to according to current input signal and history input signal Certain control algolithm is crossed, the output of controller is obtained；Controller output signal is defeated as cooling water circulation pump variable frequency device Enter, automatically adjust the rotating speed of water pump, so as to adjust out the temperature of condenser cooling water.
2. energy-saving central air conditioner automatic control system according to claim 1, it is characterised in that described controller is adopted PID control strategy is used, or Advanced Control Strategies are used according to Control performance standard requirement；PID control or Advanced Control Strategies Parameter determination according to the model parameter of each link of system, by theoretical analysis and calculation, and debugged repeatedly at system operation scene After obtain.
CN201710183085.5A 2017-03-24 2017-03-24 Energy-saving central air conditioner automatic control system Pending CN106931544A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI643047B (en) * 2017-11-16 2018-12-01 中國鋼鐵股份有限公司 Controlling method of cooling tower
CN110779230A (en) * 2019-11-29 2020-02-11 重庆通用工业(集团)有限责任公司 Large-temperature-difference low-temperature cooling circulation system
CN115164384A (en) * 2022-07-13 2022-10-11 广东工业大学 Energy-saving control system and control method for central air-conditioning water system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1793746A (en) * 2005-12-31 2006-06-28 东莞市广大制冷有限公司 Method for automatic regulating and controlling cooling water and frozen water flow of central air conditioning system
CN203964267U (en) * 2014-06-06 2014-11-26 深圳市中和国泰节能科技有限公司 Central air-conditioning Auto-matching load energy conserving system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1793746A (en) * 2005-12-31 2006-06-28 东莞市广大制冷有限公司 Method for automatic regulating and controlling cooling water and frozen water flow of central air conditioning system
CN203964267U (en) * 2014-06-06 2014-11-26 深圳市中和国泰节能科技有限公司 Central air-conditioning Auto-matching load energy conserving system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI643047B (en) * 2017-11-16 2018-12-01 中國鋼鐵股份有限公司 Controlling method of cooling tower
CN110779230A (en) * 2019-11-29 2020-02-11 重庆通用工业(集团)有限责任公司 Large-temperature-difference low-temperature cooling circulation system
CN115164384A (en) * 2022-07-13 2022-10-11 广东工业大学 Energy-saving control system and control method for central air-conditioning water system

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Application publication date: 20170707