CN201129829Y - Central air conditioner changeable temperature difference energy-saving control system - Google Patents

Central air conditioner changeable temperature difference energy-saving control system Download PDF

Info

Publication number
CN201129829Y
CN201129829Y CNU2007201224325U CN200720122432U CN201129829Y CN 201129829 Y CN201129829 Y CN 201129829Y CN U2007201224325 U CNU2007201224325 U CN U2007201224325U CN 200720122432 U CN200720122432 U CN 200720122432U CN 201129829 Y CN201129829 Y CN 201129829Y
Authority
CN
China
Prior art keywords
temperature difference
setting value
cooling
central air
water pump
Prior art date
Application number
CNU2007201224325U
Other languages
Chinese (zh)
Inventor
程鹏胜
孔四排
李信洪
Original Assignee
深圳达实智能股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳达实智能股份有限公司 filed Critical 深圳达实智能股份有限公司
Priority to CNU2007201224325U priority Critical patent/CN201129829Y/en
Application granted granted Critical
Publication of CN201129829Y publication Critical patent/CN201129829Y/en

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The utility model relates to a central air-conditioning variable temperature difference energy-saving control system, which is used to solve the shortcomings of the existing constant temperature difference energy-saving control systems. The central air-conditioning variable temperature difference energy-saving control system comprises a temperature sensor, and a water pump frequency changer, and also comprises a temperature difference calculator for calculating relative water supply-return temperature difference, a temperature difference set value memory which is used to store temperature difference set value of a time-temperature difference matrix table which is got according to end loading and electrovalence in different time interval, a temperature difference set value selector which is connected with a freezing temperature difference set value memory and is used to select relative temperature difference set value according to current time and a fuzzy controller which is connected with the temperature difference calculator, the temperature difference set value selector and a water pump frequency changer and can output relative frequency setting signals to the water pump frequency changer according to current actual temperature difference and temperature difference set value calculation. The central air-conditioning variable temperature difference energy-saving control system of the utility model can make sure that the central air conditioner can not only reach to the optimum energy saving operating status, but also can maximally reduce electricity consumption cost under the circumstance of different loads.

Description

Central air-conditioning alternating temperature difference energy-saving control system
Technical field
The utility model relates to the central air-conditioning energy control technology, more particularly, relates to a kind of central air-conditioning alternating temperature difference energy-saving control system.
Background technology
In the conventional art, when the design central air conditioner system, all press peak load usually and consider, and select the equipment of corresponding power for use, freezing/cooling water pump is also all with the work of constant flow (power frequency) pattern, so that when actual motion, system loading is much smaller than the design load.Simultaneously, because freezing/cooling water pump is with constant flow (power frequency) mode operation, operate power is constant, so that the energy that the unit cold consumes increases, and system effectiveness descends.
In order to improve running efficiency of system, cut down the consumption of energy, it is the energy-saving control system of core with the converter technique that people have proposed many, wherein the most frequently used a kind of be the constant difference energy-saving control system.The operation principle of this system is to keep freezing/cooling range constant, when load variations, regulates freezing/cooling water pump flow by frequency converter, thereby reduces freezing/cooling water pump operation energy consumption.
But along with the variation of end load, the best temperature difference set point of central air-conditioning energy also can and then change, and is satisfying under the situation of terminal comfortableness, and simple constant difference is controlled, and can not reach the maximum energy-saving running status of central air-conditioning.In addition, constant difference control can not effectively utilize Pinggu, peak electrovalence policy to use electricity in off-peak hours, so that more effectively reduce electricity cost in energy-conservation.
The utility model content
At the above-mentioned defective of prior art, the utility model solves present constant difference energy-saving control system can't guarantee under different load conditions that central air-conditioning can reach best energy-saving run state, can reduce the problem of electricity cost to greatest extent again.
The technical solution of the utility model is, a kind of central air-conditioning alternating temperature difference energy-saving control system is provided, comprising: be loaded on the chilled water supply water temperature sensor on the chilled water water main; Be loaded on the chilled water return water temperature sensor on the chilled water return main; Be loaded on the cooling water temperature sensor on the cooling water house steward; Be loaded on the cooling water temperature sensor on the cooling water house steward; Be connected with described each temperature sensor, chilled water pump frequency converter and cooling water pump frequency converter respectively, can receive the temperature signal of described each temperature sensor, calculate and respectively to the frequency controller of chilled water pump frequency converter and the given signal of cooling water pump frequency converter output corresponding frequencies.
In the utility model, also comprise the IPC (industrial control computer) that is connected with described frequency controller.
In the utility model, described frequency controller can be realized by a PLC (programmable logic controller (PLC)), at the chilled water pump frequency converter, comprising: the freezing temperature difference calculator that is connected with chilled water return water temperature sensor with described chilled water supply water temperature sensor, be used to store freezing temperature difference setting value memory with the freezing temperature difference setting value of period variation, be connected with described freezing temperature difference setting value memory, be used for selecting the freezing temperature difference setting value selector of corresponding freezing temperature difference setting value according to the current time, and with described freezing temperature difference calculator, freezing temperature difference setting value selector is connected with the chilled water pump frequency converter and can sets value the fuzzy controller that calculates and export the given signal of corresponding frequencies to described chilled water pump frequency converter according to the current freezing temperature difference and the freezing temperature difference;
At the cooling water pump frequency converter, comprising the cooling range calculator that is connected with cooling water return water temperature sensor with described cooling water temperature sensor, be used to store cooling range setting value memory with the cooling range setting value of period variation, be connected with described cooling range setting value memory, be used for selecting the cooling range setting value selector of corresponding cooling range setting value according to the current time, and with described cooling range calculator, cooling range setting value selector is connected with the cooling water pump frequency converter and can sets value the fuzzy controller that calculates and export the given signal of corresponding frequencies to described cooling water pump frequency converter according to current cooling range and cooling range.
In the central air-conditioning alternating temperature difference energy-saving control system of the present utility model, can adopt the alternating temperature differential mode to stick with paste the control energy saver mode, load and electricity price according to the end of different periods earlier, the corresponding best temperature difference is made as temperature difference setting value, obtain time-temperature difference matrix table, be stored in then in freezing/cooling range setting value memory; During concrete the operation, can satisfy under the situation of terminal comfortableness, optimize the system operation by fuzzy control on the one hand, reduce the central air conditioner system energy consumption; Given by the alternating temperature difference on the other hand, when cutting down the consumption of energy, make full use of Pinggu, peak electrovalence policy and reduce electricity cost.As seen, adopt central air-conditioning alternating temperature difference energy-saving control system of the present utility model after, central air-conditioning can reach best energy-saving run state, can reduce electricity cost to greatest extent again.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the theory diagram of the utility model central air-conditioning alternating temperature difference energy-saving control system;
Fig. 2 is the control program block diagram of PLC shown in Figure 1 (programmable logic controller (PLC)).
The specific embodiment
A preferred embodiment of the present utility model as shown in Figure 1 and Figure 2.As can be seen from Figure 1, in this central air-conditioning alternating temperature difference energy-saving control system, the frequency controller, IPC (industrial control computer), chilled water pump frequency converter, the cooling water frequency converter that comprise chilled water supply water temperature sensor, chilled water return water temperature sensor, cooling water temperature sensor, cooling water return water temperature sensor, realize by PLC (programmable logic controller (PLC)).During concrete enforcement, can in PLC and IPC, write corresponding computer programs.
Wherein, four temperature sensors are installed on chilled water water main, chilled water return main, cooling water house steward, the cooling water return main successively, are responsible for gathering corresponding current temperature, and these temperature signals are converted into after the data signal, input PLC; PLC is according to the temperature signal that receives, and the data that preset of connecting inner again are to chilled water pump frequency converter and the given signal of cooling water pump frequency converter output correspondent frequency; Frequency converter receives from behind the given signal of the frequency of PLC, regulates output frequency in view of the above, the flow of control chilled water pump and cooling water pump.
IPC wherein is connected with PLC, be used for display system running status, accept operations of operators and carry out functions such as long-range Web issue.It mainly contains following four effects:
(1) transmission of the collection of the various status datas of PLC and control information comprises the start stop operation of frequency converter running frequency feedback and given, each equipment etc.;
(2) various parameter states show and report to the police and handle, and comprise the demonstration of equipment running status animation, cooling water high temperature alarms etc. such as main frame, chilled water pump;
(3) emergency review and trend analysis comprise operation note, each equipment log, energy consumption form, load curve, temperature curve etc.;
(4), for example realize seamless link, or realize remote monitoring by the Web technology by OPC (being used for the object linking and the embedding of process control) technology and other existing system, for example BA (building automatic) system with being connected of other management information system.
As shown in Figure 2, in PLC inside, be provided with: temperature difference calculator, temperature difference predetermined value memory, temperature difference setting value selector and fuzzy controller with lower module.In fact,, be respectively equipped with the such module of a cover, the function of each module will be described in detail in detail below wherein at chilled water pump frequency converter and cooling water pump frequency converter.
Temperature difference calculator is used to receive chilled water supply water temperature and chilled water return water temperature, thereby calculates the chilled water supply backwater temperature difference, or receives cooling water temperature and cooling water return water temperature, thereby calculates the cooling water supply backwater temperature difference.
Temperature difference predetermined value memory, be used for the memory time-temperature difference matrix table.During concrete enforcement, with a week (7 days) be a setting cycle, be one with two hours and set the period, the temperature difference setting value of storage day part.Have 84 data item in this matrix table, respectively in the corresponding week every day the day part from 0 o'clock to 24 o'clock temperature difference setting value, content of each value can be passed through IPC, comprehensively (prediction) situation of the load variations in each day and Pinggu, peak electrovalence policy are set by the operator.For example when the electricity price of Pinggu, temperature difference setting value is turned down, utilized the thermal inertia accumulation of energy of water; When the peak electricity price, temperature difference setting value is transferred greatly, release energy.Simultaneously, for the ease of the practical operation adjustment, be provided with separately one based on time-the service quality adjusted value QS of temperature difference matrix table.When QS<0, output temperature difference setting value=(time-temperature difference matrix table temperature difference)+| QS|; When QS>0, output temperature difference setting value=(time-temperature difference matrix table temperature difference)-QS.
Temperature difference setting value selector among Fig. 2 is used to detect the PLC system time, and according to this time query time-temperature difference matrix table from described temperature difference setting value memory, thereby obtain the temperature difference setting value of corresponding period.The PLC system time have automatically to the time function, and can manually be provided with by IPC.
Fuzzy controller is the process values input with the supply backwater temperature difference of temperature difference calculator output, the temperature difference with the output of temperature difference setting value selector is the setting value input, calculate temperature difference deviate and temperature difference deviate rate of change (these all are accurate amounts), after it is done Fuzzy processing, obtain fuzzy set, according to this fuzzy set, the inquiry fuzzy rule base is determined fuzzy control rule, uses the fuzzy reasoning method corresponding with this fuzzy control rule then and carries out fuzzy decision, obtain corresponding fuzzy control collection, the fuzzy control collection is done sharpening handle precisely controlled amount, at last this controlled quentity controlled variable is exported to frequency converter, realize VFC water pump.
During concrete the use, the user can be according to weather forecast and log in the past, the load condition of different periods of prediction, and, determine the corresponding best temperature difference according to Pinggu, peak electrovalence policy, by IPC fill in the time-temperature difference matrix table.Thus, in each period, fuzzy controller just can obtain best temperature difference setting value, and therefore central air-conditioning also can reach best energy-saving run state and reduce electricity cost to greatest extent.
As seen, in the central air-conditioning alternating temperature difference energy-saving control system of the present utility model, the time of establishing in the PLC-temperature difference matrix table, system's temperature difference setting value is variable in difference during the period, and system is the control of alternating temperature difference; And wherein time-temperature difference matrix table sets with Pinggu, peak of different periods electricity price according to prediction load; Service quality adjusted value QS also can be set, can unify adjustment time-temperature difference matrix table based on this value; Wherein also adopt FUZZY ALGORITHMS FOR CONTROL that system is optimized control.
After adopting central air-conditioning alternating temperature difference energy-saving control system of the present utility model, the user can be according to weather forecast and log in the past, the load value of prediction day part, and determine the best temperature approach of day part in view of the above, then with these temperature approach be provided with time-temperature difference matrix table; System just can according to this time-temperature difference matrix table, alternating temperature difference operation at times, thus the realization system can both be in the maximum energy-saving running status in each period; Simultaneously, the user can be according to Pinggu, peak electrovalence policy, adjust be provided with time-temperature difference matrix table, use electricity in off-peak hours so that in energy-conservation, reduce electricity cost to greatest extent.Measuring and calculating shows that central air conditioner system integrated power-saving rate of the present utility model reaches 20%, operates very flexibly, and the stability to ambient parameter also is greatly improved simultaneously.

Claims (4)

1, a kind of central air-conditioning alternating temperature difference energy-saving control system is characterized in that, comprising:
Be loaded on the chilled water supply water temperature sensor on the chilled water water main;
Be loaded on the chilled water return water temperature sensor on the chilled water return main;
Be loaded on the cooling water temperature sensor on the cooling water house steward;
Be loaded on the cooling water temperature sensor on the cooling water house steward;
Be connected with described each temperature sensor, chilled water pump frequency converter and cooling water pump frequency converter respectively, can receive the temperature signal of described each temperature sensor, and respectively to the frequency controller of the given signal of chilled water pump frequency converter and cooling water pump frequency converter output corresponding frequencies.
2, central air-conditioning alternating temperature difference energy-saving control system according to claim 1 is characterized in that, also comprises the industrial control computer that is connected with described frequency controller.
3, central air-conditioning alternating temperature difference energy-saving control system according to claim 1 is characterized in that, comprises in the described frequency controller:
The freezing temperature difference calculator that is connected with chilled water return water temperature sensor with described chilled water supply water temperature sensor, be used to store freezing temperature difference setting value memory with the freezing temperature difference setting value of period variation, be connected with described freezing temperature difference setting value memory, be used for selecting the freezing temperature difference setting value selector of corresponding freezing temperature difference setting value according to the current time, and with described freezing temperature difference calculator, freezing temperature difference setting value selector is connected with the chilled water pump frequency converter and can sets value the fuzzy controller that calculates and export the given signal of corresponding frequencies to described chilled water pump frequency converter according to the current freezing temperature difference and the freezing temperature difference;
Also comprise: the cooling range calculator that is connected with cooling water return water temperature sensor with described cooling water temperature sensor, be used to store cooling range setting value memory with the cooling range setting value of period variation, be connected with described cooling range setting value memory, be used for selecting the cooling range setting value selector of corresponding cooling range setting value according to the current time, and with described cooling range calculator, cooling range setting value selector is connected with the cooling water pump frequency converter and can sets value the fuzzy controller that calculates and export the given signal of corresponding frequencies to described cooling water pump frequency converter according to current cooling range and cooling range.
4, central air-conditioning alternating temperature difference energy-saving control system according to claim 1 is characterized in that described frequency controller is realized by a programmable logic controller (PLC).
CNU2007201224325U 2007-08-24 2007-08-24 Central air conditioner changeable temperature difference energy-saving control system CN201129829Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU2007201224325U CN201129829Y (en) 2007-08-24 2007-08-24 Central air conditioner changeable temperature difference energy-saving control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2007201224325U CN201129829Y (en) 2007-08-24 2007-08-24 Central air conditioner changeable temperature difference energy-saving control system

Publications (1)

Publication Number Publication Date
CN201129829Y true CN201129829Y (en) 2008-10-08

Family

ID=40017683

Family Applications (1)

Application Number Title Priority Date Filing Date
CNU2007201224325U CN201129829Y (en) 2007-08-24 2007-08-24 Central air conditioner changeable temperature difference energy-saving control system

Country Status (1)

Country Link
CN (1) CN201129829Y (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101825326A (en) * 2010-04-30 2010-09-08 河海大学常州校区 Fuzzy adaptive central air-conditioning cooling water energy-saving control system and fuzzy adaptive method thereof
CN102080862A (en) * 2009-11-27 2011-06-01 三菱电机株式会社 Air conditioner controller
CN101526260B (en) * 2009-04-20 2011-07-20 广东志高空调有限公司 Variable-frequency air-conditioner control method and control device thereof
CN102338440A (en) * 2010-07-22 2012-02-01 海尔集团公司 Variable frequency air conditioner and control method thereof
CN102734895A (en) * 2012-06-29 2012-10-17 四川长虹电器股份有限公司 Control method for frequency conversion air conditioner
CN104534628A (en) * 2015-01-26 2015-04-22 珠海格力电器股份有限公司 Control method and system for variable-frequency cooling water pump
CN104654526A (en) * 2015-02-02 2015-05-27 韩冰 Low-flow large-temperature-difference energy-saving control method for refrigeration station unit
CN109114776A (en) * 2018-07-18 2019-01-01 宁波高新区安立特电气科技有限公司 A kind of central air-conditioning servo water pump circulating energy-saving control system
CN109556225A (en) * 2018-10-31 2019-04-02 珠海格力电器股份有限公司 A kind of control method and cooling system of the refrigerating capacity of cooling system
CN110686364A (en) * 2019-10-18 2020-01-14 广东美的暖通设备有限公司 Air conditioner control method and device and computer readable storage medium
CN112066751A (en) * 2020-09-11 2020-12-11 广州览讯科技开发有限公司 Centrifugal blast air crossing current open cooling tower

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101526260B (en) * 2009-04-20 2011-07-20 广东志高空调有限公司 Variable-frequency air-conditioner control method and control device thereof
CN102080862A (en) * 2009-11-27 2011-06-01 三菱电机株式会社 Air conditioner controller
CN101825326A (en) * 2010-04-30 2010-09-08 河海大学常州校区 Fuzzy adaptive central air-conditioning cooling water energy-saving control system and fuzzy adaptive method thereof
CN102338440A (en) * 2010-07-22 2012-02-01 海尔集团公司 Variable frequency air conditioner and control method thereof
CN102734895A (en) * 2012-06-29 2012-10-17 四川长虹电器股份有限公司 Control method for frequency conversion air conditioner
CN104534628A (en) * 2015-01-26 2015-04-22 珠海格力电器股份有限公司 Control method and system for variable-frequency cooling water pump
CN104654526A (en) * 2015-02-02 2015-05-27 韩冰 Low-flow large-temperature-difference energy-saving control method for refrigeration station unit
CN109114776A (en) * 2018-07-18 2019-01-01 宁波高新区安立特电气科技有限公司 A kind of central air-conditioning servo water pump circulating energy-saving control system
CN109556225A (en) * 2018-10-31 2019-04-02 珠海格力电器股份有限公司 A kind of control method and cooling system of the refrigerating capacity of cooling system
CN110686364A (en) * 2019-10-18 2020-01-14 广东美的暖通设备有限公司 Air conditioner control method and device and computer readable storage medium
CN112066751A (en) * 2020-09-11 2020-12-11 广州览讯科技开发有限公司 Centrifugal blast air crossing current open cooling tower

Similar Documents

Publication Publication Date Title
US9215780B2 (en) System and method for reducing peak and off-peak electricity demand by monitoring, controlling and metering lighting in a facility
JP5518216B2 (en) Energy management control system and method based on cloud computing
CN203012939U (en) Energy consumption monitoring system
CN103472812B (en) A kind of energy management system
CN105135636B (en) Central air-conditioning variable-flow optimizes system
CN104374052B (en) Energy-saving control method for central air conditioner and system based on neutral net
CN101902832B (en) Lower power consumption wireless sensor network node device capable of monitoring vibration continuously
CN102052739B (en) Central air conditioner intelligent control system based on wireless sensor network and method
CN101581491B (en) Load control energy-saving system of central air conditioning system
CN201548581U (en) System for monitoring emery consumption of public buildings
CN100495272C (en) Integrative data source based automatic optimization scheduling system and method for energy source of steel and iron
CN102721156B (en) Central air-conditioning self-optimization intelligent fuzzy control device and control method thereof
CN101424436B (en) Intelligent optimizing control system and method for central air-conditioning
CN201935434U (en) Solar water heater based on internet-of-things technical auxiliary control
CN102003772B (en) Energy-saving optimized control method of water source heat pump
CA2846342A1 (en) Use of demand response (dr) and distributed energy resources (der) to mitigate the impact of variable energy resources (ver) in power system operation
CN103062861B (en) Energy-saving method and system for central air conditioner
CN102193544A (en) Intelligent building energy management system
CN202649779U (en) Constant temperature and constant humidity textile workshop air-conditioning control system based on Internet of things
WO2011106914A1 (en) Device monitoring system and method based on cloud computing
CN100578106C (en) Quality and regulation control method and system for chill station of central air conditioner
CN103208085B (en) Analysis intelligence system for improving load rate and reducing maximum demand of power utilization of enterprises
CN201993809U (en) Integrated energy source management system
CN102135311B (en) Air conditioning system integral optimized control device
CN101825325B (en) Energy saving control device for multi-split central air conditioner and control method thereof

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
CB03 Change of inventor or designer information

Inventor after: Cheng Pengsheng

Inventor after: Kong Pai four

Inventor after: Li Xinhong

Inventor before: Cheng Pengsheng

Inventor before: Kong Pai four

Inventor before: Li Xinhong

C53 Correction of patent for invention or patent application
COR Change of bibliographic data

Free format text: CORRECT: INVENTOR; FROM: CHENG PENGSHENG; KONG SIPAI; LI XINHONG TO: CHENG PENGSHENG; KONG SIPAI; LI XINHONG

EXPY Termination of patent right or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20081008

Termination date: 20150824