CN200949895Y - Digitalized central air-conditioning system energy-saving control device - Google Patents
Digitalized central air-conditioning system energy-saving control device Download PDFInfo
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- CN200949895Y CN200949895Y CN 200620035861 CN200620035861U CN200949895Y CN 200949895 Y CN200949895 Y CN 200949895Y CN 200620035861 CN200620035861 CN 200620035861 CN 200620035861 U CN200620035861 U CN 200620035861U CN 200949895 Y CN200949895 Y CN 200949895Y
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- frequency converter
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- central air
- temperature sensor
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Abstract
A energy saving control apparatus for digital central air-conditioner system comprises a temperature sensor for chilled water inlet and chilled water outlet, a temperature sensor for cooling water inlet and cooling water outlet, a pressure sensor for chilled water outlet, a flow sensor of profit and loss tube, a temperature sensor for the chilled water outlet and the chilled water inlet of the high building heat exchanger. The sensors are connected to intelligent A/D transfer mode and the signals are transferred to the digital signals to transmit into the computer. The computer is connected to each chilled water pump, each cooling water pump, each frequency converter of the cooling fan for output of the frequency control digital signal from computation and adjustment of the three-phase current frequency of each frequency converter. The frequency converter is connected to each water pump and fan, respectively for controlling the speed and flow. The apparatus is configured the corresponding sensor according to the system figuration, and the frequency converter connected to the computer by bus is at most 127 set. The apparatus has the advantages of high accuracy, good stability, more apparent energy saving effect of large scale and supersized system, 60 to 80 per cent energy saving of each motor, 10 to 30 per cent energy saving of main machine of air conditioner, simple circuit, low cost and suitable to wide application.
Description
(1) technical field
The utility model relates to a kind of control device of central air conditioner system, is specially a kind of digitlization central air conditioner system energy-saving control device.
(2) technical background
My utility model patent 03249625 " central air conditioner system energy-saving control device ", temperature, flow differential pressure sensor are installed on pipeline, by subtracter, isolator etc. signal is handled, again by comparison circuit, proportional integral circuit in the frequency converter, frequency converter is controlled respectively the pump of chilled water system and the pump and the blower fan of cooling water system, cost is low, and is easy to implement.As control signal, regulate the frequency of frequency converter with the analog quantity of temperature, pressure, the rotating speed that control cuts out the pump mutually, thus change the flow of carrying liquid, reach energy-conservation purpose.This method adopts many reference amounts that central air conditioner system is controlled, and energy-saving effect is obvious.But,, when controlled device increases, can only adopt a plurality of isolation modules to carry the multi-analog control signal when central air-conditioning system is bigger.Therefore the analog quantity control signal is vulnerable to the various factors interference, causes jitter, and the FREQUENCY CONTROL precision reduces.When frequency error be ± during 2Hz, the pump rotary speed error is up to 20%.Greatly influenced energy-saving effect.During practice, energy-conservation when controlled device is 1～2 generally all reaches 30%～40%, but surpasses 3 when above when the controlled device in each controlled device group, because the influence of this error, energy-conservation amplitude obviously descends, and only is about 20%.Therefore present central air conditioner system energy-saving control device is not suitable for using in large-scale or superhuge central air conditioner system.
(3) utility model content
The purpose of this utility model is a kind of digitlization central air conditioner system energy-saving control device of design, improves the stability and the control accuracy of operation, improves energy-saving effect.
The digitlization central air conditioner system energy-saving control device of the utility model design, its central air conditioner system comprises central air conditioner main machine, chilled water or warm water subsystem, cooling water subsystem.Send chilled water during the main frame refrigeration in the summer central air conditioner system, the pipeline subsystem that it is connected with user side is the chilled water subsystem, and main frame heats and sends warm water in the winter time, is the warm water subsystem.So for chilled water or warm water subsystem, below all abbreviate the chilled water subsystem as.The chilled water outlet and the inlet of the air-conditioner host of 1 or many parallel connections are separately installed with chilled water outlet temperature sensor and chilled water inlet temperature sensor in the central air conditioner system, be separately installed with cooling water outlet temperature sensor and cooling water inlet temperature sensor at its coolant outlet and inlet, in the air-conditioning system that has the dynamic pressure difference to require, pressure differential pressure sensor is installed, flow sensor is installed having on the chilled water profit and loss pipeline of secondary or three chilled water pump groups at chilled water outlet; System with high-rise heat exchanger and three chilled water pumps also is separately installed with high-rise heat exchanger chilled water outlet temperature sensor and high-rise heat exchanger chilled water inlet temperature sensor at the chilled water outlet and the inlet of high-rise heat exchanger; Above-mentioned each sensor connects intelligent A/D modular converter by signal cable, and the A/D modular converter connects computer through digital signal cable.Computer then connects each frequency converter digital port of each chilled water pump, cooling water pump, cooling blower by signal cable.Each frequency converter that is connected to three phase mains is connected with each chilled water water pump, cooling water pump, cooling blower respectively through threephase cable.
The curtage analog signal of each sensor becomes data signal through the A/D module processing, sends into computer.Computer obtains the FREQUENCY CONTROL data signal through computing, sends into the frequency converter that is attached thereto the variant address that connects, and regulates the three-phase electricity frequency, and the water pump that the control frequency converter connects or the rotating speed of blower fan reach the purpose of controlling flow.
In the general central air conditioner system, the temperature difference of setting its chilled water pipeline import and export during refrigeration is 3～6 ℃, the temperature difference that this warm water pipeline is imported and exported when heating is 6～12 ℃, import and export temperature approach according to the chilled water pipeline of setting, the measured temperature signal of chilled water import and export sensor is carried out subtraction obtain error feedback signal, again through the proportional integral computing, export given frequency number word signal, send into the frequency converter that is attached thereto each chilled water pump that connects, regulate the three-phase electricity frequency, control each chilled water pump rotating speed, flow.
The central air conditioner system that has the dynamic pressure difference to require, also can be with the minimum dynamic pressure difference of system's service requirement as setting signal, the pressure signal of the pressure differential pressure sensor of the pipeline outlet of chilled water subsystem is as error feedback signal, computer is through the proportional integral computing, export given frequency number word signal, send into the frequency converter that is attached thereto each chilled water pump that connects, regulate the three-phase electricity frequency, control each chilled water pump rotating speed, flow, the minimum dynamic pressure difference requirement of maintenance system.
The chilled water subsystem can be installed into outlet temperature sensor and pressure sensor simultaneously, and computer is according to the different system requirement, select the two one of signal, through the proportional integral computing, export given frequency number word signal.
In the cooling water subsystem of central air conditioner system, be set to 34～38 ℃ according to the general cooling water inlet temperature of system requirements, outlet temperature is set to 30～34 ℃.Each cooling water pump for this system, with cooling water outlet temperature be 30～34 ℃ as setting signal, with cooling water outlet temperature sensor measured temperature signal is error feedback signal, computer is through the proportional integral computing, export given frequency number word signal, send into the frequency converter that is connected with each cooling water pump, regulate the three-phase electricity frequency, control each cooling water pump rotating speed, control cooling water flow.Each cooling blower for the cooling water subsystem, with cooling water inlet temperature be 34～38 ℃ as setting signal, with cooling water inlet temperature sensor measured temperature signal is error feedback signal, computer is through the proportional integral computing, export given frequency number word signal, send into the frequency converter that is connected with each cooling blower, regulate the three-phase electricity frequency, control the cooling air quantity of each cooling blower rotating speed, control cooling blower.
For heavy construction or skyscraper, need secondary chilled water pump and/or high-rise heat exchanger and three chilled water pumps, import and export mounting temperature sensor at high-rise heat exchanger chilled water, import and export temperature approach according to the high-rise heat exchanger chilled water pipeline of setting, the measured temperature signal of high-rise heat exchanger chilled water out temperature sensor is carried out subtraction obtain error feedback signal, again through the proportional integral computing, export given frequency number word signal, send into the frequency converter that the frequency converter that is attached thereto each the secondary chilled water pump that connects reaches each three chilled water pump, regulate the three-phase electricity frequency, control each secondary and three chilled water pump rotating speeds, flow.
In the system that secondary or three chilled water pumps are arranged, on the profit and loss pipe of chilled water flow sensor is installed, flow sensor is identical with other sensor, connects intelligent A/D modular converter by signal cable, connects computer through digital signal cable again.Computer then connects the frequency converter digital port of a chilled water pump group by signal cable, control total flow and secondary or three chilled water pump SEQs that each chilled water pump is carried chilled water or warm water by control through the flow of profit and loss pipe.With the discharge of the profit and loss pipe of flowing through is zero as setting signal, flow sensor institute measurement of discharge signal with the profit and loss pipe is an error feedback signal, computer is according to the signal of flow sensor and the signal of out temperature sensor, through the proportional integral computing, export given frequency number word signal, send into the frequency converter that is connected with each chilled water pump, regulate the three-phase electricity frequency, the flow that each chilled water pump rotating speed of control, chilled water of realization control are carried.
This digitlization central air conditioner system energy-saving control device is according to chilled water pump group once only in the chilled water subsystem of central air conditioner system, or once with secondary chilled water pump group, or once, secondary and three chilled water pump groups, or once with three chilled water pump groups, corresponding sensor is installed.Prepare according to each the pump group of chilled water subsystem and cooling water subsystem and the varying number of blower fan group, increase or reduce the quantity of frequency converter.Each frequency converter has particular address, and computer is connected with each frequency converter by communication bus, transmits control signal according to the address to each frequency converter.
In the utility model digitlization central air conditioner system energy-saving control device, out temperature, the dynamic pressure of chilled water subsystem is poor, profit and loss pipe flow and cooling water send a plurality of analog signals such as system's out temperature error freely to be converted to data signal in real time by intelligent A/D modular converter, and by each frequency converter of control after the Computing, the control accuracy height, good stability; More obvious for the large-scale or ultra-large type central air conditioner system energy-saving effect that every group of controlled device surpasses more than 3.Controllable frequency converter quantity can reach 127 at most.By data wire each sensor measured signal is controlled frequency converter after the machine computing as calculated, in real time the load variations of the whole central air conditioner system of being made up of chilled water induction system, cooling water induction system, cooling blower system with motion tracking provides appropriate load institute energy requirement.Because of the flow of water or air in each subsystem reduces amplitude up to 30%～50%, each electrical machine energy-saving reaches 60%～80%, simultaneously because the minimizing that enters the amount of liquid of central air conditioner main machine evaporimeter and condenser, also reduce the positive energy exchange of central air conditioner main machine greatly, increase its unloading amplitude, improve its efficient, central air conditioner main machine is energy-conservation to reach 10%～30%.This device digitized signal control circuit is simple, and cost is low, is fit to apply.
(4) description of drawings
Fig. 1 is this digitlization central air conditioner system energy-saving control device circuit theory diagrams;
Fig. 2 is that this digitlization central air conditioner system energy-saving control device embodiment 1 sensor is installed connection diagram;
Fig. 3 is that this digitlization central air conditioner system energy-saving control device embodiment 2 sensors are installed connection diagram.
(5) specific embodiment
Figure 1 shows that the circuit theory diagrams of this digitlization central air conditioner system energy-saving control device embodiment, the chilled water inlet temperature sensor that central air conditioner system is installed, the chilled water outlet temperature sensor, high-rise heat exchanger chilled water outlet temperature sensor, high-rise heat exchanger chilled water inlet temperature sensor, the cooling water inlet temperature sensor, the cooling water outlet temperature sensor, the chilled water outlet pressure sensor, 8 sensors such as chilled water profit and loss flow sensor tube ,+24V dc source by cable respectively with No. 8 sensors, intelligence A/D digital module, the power end of computer links to each other.Above-mentioned 8 sensors all are connected with intelligent A/D modular converter by the signal shielding cable, intelligence A/D modular converter inserts computer through 485 digital communication interfaces with 485 communication cables, used computer is embedded integrated computer, fanout connects each chilled water pump frequency converter through 485 communication cables, each secondary chilled water pump frequency converter, each three chilled water pump frequency converter, each cooling water pump frequency converter, each cooling blower frequency converter, each frequency converter that connects three phase mains is respectively through three phase mains cable and a chilled water pump, the secondary chilled water pump, three chilled water pumps, cooling water pump, cooling blower connects.
This digitlization central air conditioner system energy-saving control device is according to chilled water pump once in the chilled water subsystem of central air conditioner system, or once with the secondary chilled water pump, or once, secondary and three chilled water pumps, or once with three chilled water pumps, corresponding sensor is installed; Prepare according to each the water pump group of chilled water subsystem and cooling water subsystem and the varying number of blower fan group, increase or reduce the quantity of frequency converter.Intelligence A/D modular converter and each frequency converter have the particular address of corresponding computer installation.Computer is connected with each frequency converter by communication bus, is connected with 485 digital input ports of each frequency converter through 485 communication buses through 485 digital ports as computer, transmits digital controlled signal according to the address to each frequency converter.The address maximum can be set to 127.
Figure 2 shows that this digitlization central air conditioner system energy-saving control device embodiment 1, for this device be used for general only once the sensor of the system of chilled water pump connection diagram is installed.Central air conditioner system comprises central air conditioner main machine in the present embodiment, chilled water subsystem, cooling water subsystem.In the chilled water subsystem, central air conditioner main machine is connected with each user side through chilled water pipe, and the chilled water return pipe that returns from user side is connected with chilled water pump group 6, and chilled water pump group 6 is connected with central air conditioner main machine through the chilled water return pipe.In the cooling water subsystem, central air conditioner main machine is connected with the cooling air unit of cooling tower through cooling water pipe, and the CWR of cooling tower returns central air conditioner main machine through cooling water pump group 7.
The chilled water of central air conditioner main machine is imported and exported chilled water inlet temperature sensor 3 and chilled water outlet temperature sensor 2 is installed respectively; The cooling water outlet and inlet of central air conditioner main machine is installed cooling water inlet temperature sensor 4 and cooling water outlet temperature sensor 5 respectively; As shown in Figure 1, each sensor is connected with intelligent A/D modular converter by the signal shielding cable, intelligence A/D converting digital module inserts embedded integrated computer through 485 digital communication interfaces with 485 communication shielded cables, fanout connects variant address frequency converter 485 digital ports, the frequency converter of each chilled water pump connects each chilled water pump through the three phase mains cable respectively, each cooling water pump frequency converter connects each cooling water pump through the three phase mains cable respectively, and each cooling blower frequency converter connects each cooling blower.The particular address of each frequency converter of computer installation, to each frequency converter sending controling instruction, computer-controllable system frequency converter sum reaches 127 according to the address.According to the cooling water pump that disposes in the quantity of the chilled water pump that disposes in the chilled water subsystem and the cooling water subsystem and the quantity of cooling blower, dispose corresponding frequency converter.
As shown in Figure 2, at chilled water outlet chilled water outlet pressure sensor 1 is installed also, by setting minimum dynamic pressure difference and temperature approach, the temperature signal that computer selection pressure signal or chilled water are imported and exported, the given frequency number word signal of output after the computing, send into the frequency converter of each chilled water pump, regulate the three-phase electricity frequency, control each chilled water pump rotating speed, flow.
Figure 3 shows that this digitlization central air conditioner system energy-saving control device embodiment 2, the sensor that is used to have the large-scale central air conditioner system of secondary chilled water pump and high-rise heat exchanger, three chilled water pumps for this device is installed connection diagram.Its cooling water subsystem of the central air conditioner system of present embodiment 2 is identical with embodiment 1, comprises cooling water pump group 7 and cooling blower; Its chilled water subsystem comprises chilled water pump group 6, secondary chilled water pump group 9 and a high-rise heat exchanger and three chilled water pump groups 12 for being fit to the complicated chilled water subsystem of skyscraper.Central air conditioner main machine chilled water outlet end is connected with secondary chilled water pump group 9, secondary chilled water pump group 9 is connected with each user side, the chilled water return pipe that returns from user side connects the chilled water inlet end of central air conditioner main machines through chilled water pump group 6, form low layer chilled water closed circuit, between the entrance point of chilled water pump group 6 and secondary chilled water pump group 9, connect the profit and loss pipe simultaneously.Another road chilled water carrier pipe of secondary chilled water pump 9 is connected with high-rise heat exchanger, high-rise heat exchanger chilled water outlet end connects each high-rise user side, the chilled water pipe that returns from each high-rise user side connects the chilled water inlet end of high-rise heat exchangers through three chilled water pump groups 12, forms high-rise chilled water closed circuit.As shown in Figure 3, chilled water outlet pressure sensor 1, chilled water outlet temperature sensor 2, chilled water inlet temperature sensor 3, cooling water inlet temperature sensor 5, cooling water outlet temperature sensor 4, chilled water profit and loss flow sensor tube 8 are installed, high-rise heat exchanger chilled water inlet temperature sensor 11, high-rise heat exchanger chilled water outlet temperature sensor 10.As shown in Figure 1, above-mentioned each sensor is connected with intelligent A/D modular converter, and intelligent A/D modular converter inserts computer, and computer connects each frequency converter, and each frequency converter is connected with controlled device through threephase cable.
Claims (3)
1 one kinds of digitlization central air conditioner system energy-saving control devices are installed central air-conditioning chilled water inlet temperature sensor, chilled water outlet temperature sensor and/or chilled water outlet pressure sensor respectively in the central air conditioner system; The cooling water inlet temperature sensor of central air-conditioning and cooling water outlet temperature sensor; It is characterized in that:
Described each temperature sensor and/or pressure sensor connect intelligent A/D modular converter by signal cable, intelligence A/D modular converter inserts computer through signal cable, fanout connects each chilled water pump frequency converter, each cooling water pump frequency converter, each cooling blower frequency converter through the signal shielding cable, and each frequency converter that connects three phase mains is connected with chilled water pump, cooling water pump, a cooling blower through the three phase mains cable respectively.
2, digitlization central air conditioner system energy-saving control device according to claim 1 is characterized in that:
Described central air conditioner system has secondary chilled water pump and/or high-rise heat exchanger and three chilled water pumps, and chilled water profit and loss flow sensor tube, high-rise heat exchanger chilled water inlet temperature sensor, high-rise heat exchanger chilled water outlet temperature sensor also are installed; Described temperature sensor is connected intelligent A/D modular converter with flow sensor by signal cable, intelligence A/D modular converter inserts computer through signal cable, fanout connects each secondary chilled water pump frequency converter and each three chilled water pump frequency converter through the signal shielding cable, and each frequency converter that connects three phase mains is connected with secondary chilled water pump, No. three cooling water pumps through the three phase mains cable respectively.
3, digitlization central air conditioner system energy-saving control device according to claim 1 and 2 is characterized in that:
Computer is connected with each frequency converter through communication bus, and intelligent A/D modular converter and each frequency converter have the particular address of corresponding computer installation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200620035861 CN200949895Y (en) | 2006-10-09 | 2006-10-09 | Digitalized central air-conditioning system energy-saving control device |
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| CN 200620035861 CN200949895Y (en) | 2006-10-09 | 2006-10-09 | Digitalized central air-conditioning system energy-saving control device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102367980A (en) * | 2011-10-19 | 2012-03-07 | 深圳市奥宇控制系统有限公司 | Central air-conditioning multi-dimension integrating optimization control system and method |
| CN102809195A (en) * | 2011-05-30 | 2012-12-05 | 昆山台佳机电有限公司 | Water source heat pump intelligent centralized control all-in-one machine capable of spontaneously changing flow |
| CN104566844A (en) * | 2013-10-18 | 2015-04-29 | 宁夏先锋软件有限公司 | Central air conditioner energy-saving unit |
| CN104879992A (en) * | 2015-03-26 | 2015-09-02 | 上海大众祥源动力供应有限公司 | Energy-saving water supply system based on automatic heat exchange |
| CN105546759A (en) * | 2016-01-12 | 2016-05-04 | 重庆大学 | Central air-conditioning energy-saving control system and control strategy thereof |
| CN113175743A (en) * | 2021-04-15 | 2021-07-27 | 江苏天纳节能科技股份有限公司 | Special integrated intelligent driver for fan and water pump of central air-conditioning energy-saving control system |
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2006
- 2006-10-09 CN CN 200620035861 patent/CN200949895Y/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102809195A (en) * | 2011-05-30 | 2012-12-05 | 昆山台佳机电有限公司 | Water source heat pump intelligent centralized control all-in-one machine capable of spontaneously changing flow |
| CN102809195B (en) * | 2011-05-30 | 2015-12-16 | 昆山台佳机电有限公司 | From the water source heat pump intelligent centralized-control all-in-one machine of variable-flow |
| CN102367980A (en) * | 2011-10-19 | 2012-03-07 | 深圳市奥宇控制系统有限公司 | Central air-conditioning multi-dimension integrating optimization control system and method |
| CN102367980B (en) * | 2011-10-19 | 2014-04-30 | 深圳市奥宇控制系统有限公司 | Central air-conditioning multi-dimension integrating optimization control system and method |
| CN104566844A (en) * | 2013-10-18 | 2015-04-29 | 宁夏先锋软件有限公司 | Central air conditioner energy-saving unit |
| CN104879992A (en) * | 2015-03-26 | 2015-09-02 | 上海大众祥源动力供应有限公司 | Energy-saving water supply system based on automatic heat exchange |
| CN104879992B (en) * | 2015-03-26 | 2017-11-03 | 上海大众祥源动力供应有限公司 | A kind of energy-saving water supply system based on automatic heat exchange |
| CN105546759A (en) * | 2016-01-12 | 2016-05-04 | 重庆大学 | Central air-conditioning energy-saving control system and control strategy thereof |
| CN105546759B (en) * | 2016-01-12 | 2018-08-24 | 重庆大学 | A kind of central air conditioning energy-saving control system and its control strategy |
| CN113175743A (en) * | 2021-04-15 | 2021-07-27 | 江苏天纳节能科技股份有限公司 | Special integrated intelligent driver for fan and water pump of central air-conditioning energy-saving control system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070919 Termination date: 20111009 |