CN105066376A - Artificial cold source intelligent control system of building structure - Google Patents
Artificial cold source intelligent control system of building structure Download PDFInfo
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- CN105066376A CN105066376A CN201510563975.XA CN201510563975A CN105066376A CN 105066376 A CN105066376 A CN 105066376A CN 201510563975 A CN201510563975 A CN 201510563975A CN 105066376 A CN105066376 A CN 105066376A
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- cooling water
- frequency converter
- control system
- cold source
- water pump
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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
- 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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
- F24F11/59—Remote control for presetting
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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)
- Air Conditioning Control Device (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention discloses an artificial cold source intelligent control system of a building structure and belongs to the technical field of intelligent control. The artificial cold source intelligent control system comprises an air conditioner main device, and a cooling water circulation unit and a freezing water circulation unit which are connected with the air conditioner main device. A cooling water pump and a cooling tower fan are arranged in the cooling water circulation unit. A freezing water pump and a fan coil are arranged in the freezing water circulation unit. The artificial cold source intelligent control system further comprises a control unit. A programmable logic controller, and a cooling water frequency converter, a cooling water inflow temperature sensor, a cooling water outflow temperature sensor, a freezing water frequency converter, a freezing water inlet temperature sensor and a freezing water return temperature sensor which are connected with the programmable logic controller are arranged in the control unit. The cooling water frequency converter is connected with the cooling water pump. The freezing water frequency converter is connected with the freezing water pump. By means of the artificial cold source intelligent control system of the building structure, the indoor environment temperature is controlled within a constant range and prevented from being too high or low, so that energy loss and waste are reduced, and the cost is reduced.
Description
Technical field
The present invention relates to field of intelligent control technology, particularly a kind of building structure artificial cold source intelligence control system.
Background technology
Desirable human settlement should be the coordinating and unifying that low energy consumption and height are comfortable.The air parameter investigating interior climate environmental thermal comfort comprises: temperature, speed, humidity, air age etc., these parameters determine by HV & AC system, and depend on the artificial cold source system in HV & AC to a great extent.
According to investigations, the unit architectural electric power consumption of Chinese large-sized public building is 10 ~ 15 times of residential housing, is 2 ~ 4 times of general non-residential construction.The year power consumption of this kind of building in the whole nation is 1,000 hundred million degree/year, accounts for 6% of national gross generation.The principal element causing power consumption high is air-conditioning system artificial cold source and force ventilation energy consumption.The high main cause of energy consumption is because safe clearance during lectotype selection is comparatively large on the one hand, and when causing actual motion, great majority are in inefficient operating point, are that Energy Efficiency Ratio is lower because system can not control as required on the other hand.
Artificial cold source unit is generally equal is reduced to four large part systems, that is: compressor, evaporimeter, condenser, throttling arrangement.The system that this four large part is formed is typical multivariable close coupling control system, very difficult foundation accurately Mathematical Modeling to realize accurate control.In reality, two-position relay is used to control to there will be the inferior positions such as temperature fluctuation is large, energy consumption is high, comfortableness is poor.Meanwhile, the frequent starting of compressor can reduce its service life.Therefore, real-time Dynamic controlling be realized, must Intelligent Control Strategy be adopted.
This term of Based Intelligent Control was proposed by Leondes as far back as 1967, refer to that control system has the function of apery, the change constantly conformed, to process much information to reduce control deviation, improves Control platform, and its content contains artificial intelligence, automatically control and operational research three subjects.In recent years, Based Intelligent Control such as fuzzy control, ANN Control, extension control, chaos controlling, Multimode Control, study control, rule-based Human Simulating Intelligent Control etc. are applied in field of Refrigeration and Air-conditioning, and obtain good effect.
VAV and VRV system is and utilizes Based Intelligent Control automatically to carry out the typical varying capacity artificial cold source pattern regulated according to load and disturbance.Wherein VAV system mainly realizes cold Dynamic controlling by changing air quantity, and VRV system then carries out cold regulation by changing refrigeration system flow.Both can realize multi-split air conditioner at combination.But above-mentioned kind of mode is difficult to reach accurate control to temperature, and easily causes excessive refrigeration, and cause huge energy waste, use cost is high.
Summary of the invention
The invention provides a kind of building structure artificial cold source intelligence control system, solve existing intelligence control system and be difficult to reach to temperature the problem accurately controlled.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of building structure artificial cold source intelligence control system, the cooling water circulation unit comprising air-conditioner host and be connected with described air-conditioner host and chilled water cycling element, cooling water pump and blower fan of cooling tower is provided with in described cooling water circulation unit, chilled water pump and fan coil is provided with in described chilled water cycling element, also comprise control unit, the cooling water frequency converter being provided with Programmable Logic Controller in described control unit and being connected with described Programmable Logic Controller, cold in-water temperature sensor, cooling water leaving water temperature sensors, chilled water frequency converter, chilled water inlet temperature sensor and chilled water return water temperature sensor, described cooling water frequency converter is connected with described cooling water pump, and described chilled water frequency converter is connected with described chilled water pump.
Wherein, preferably, also comprise the first power frequency supply, cooling water pump described in described Controlled by Programmable Controller is connected with described cooling water frequency converter or with described first power frequency supply.
Wherein, preferably, described cooling water pump is two water pumps be arranged in parallel.
Wherein, preferably, also comprise the second power frequency supply, chilled water pump described in described Controlled by Programmable Controller is connected with described chilled water frequency converter or with described second power frequency supply.
Wherein, preferably, described chilled water pump is two water pumps be arranged in parallel.
Wherein, preferably, also comprise fan frequency converter, described Programmable Logic Controller, described fan frequency converter are connected successively with described blower fan of cooling tower.
Wherein, preferably, also comprise the first electric expansion valve, be connected between described cooling water pump and blower fan of cooling tower, described first expansion valve is also connected with described Programmable Logic Controller.
Wherein, preferably, also comprise the second electric expansion valve, be connected between described chilled water pump and described fan coil, described second expansion valve is also connected with described Programmable Logic Controller.
Beneficial effect of the present invention:
The present invention adopts Programmable Logic Controller to control, respectively by temperature sensor, cooling water, chilled water temperature are sampled, Programmable Logic Controller carrys out the frequency of controlled cooling model water pump, chilled water pump again by frequency converter according to the temperature signal of sampling, thus the flow of difference controlled cooling model water, chilled water, finally reach the thermostatic control of cooling water, chilled water, and then make indoor environment temperature control within constant scope, avoid excessively freezing or heating, thus reduce energy loss waste, cost-saving.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the master control sketch of building structure artificial cold source intelligence control system of the present invention;
Fig. 2 is the basic block diagram of cooling water circulation unit variable flow system in the present invention;
Fig. 3 is water pump main circuit circuit diagram in the present invention;
Fig. 4 is the control block diagram of building structure artificial cold source intelligence control system of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1 to 4, the present embodiment provides a kind of building structure artificial cold source intelligence control system, comprises air-conditioner host and the cooling water circulation unit that is connected with air-conditioner host and chilled water cycling element.
The basic block diagram of cooling water circulation unit variable flow system as shown in Figure 2, be provided with cooling water pump, blower fan of cooling tower, cooling water frequency converter, cold in-water temperature sensor, cooling water leaving water temperature sensors and fan frequency converter in cooling water circulation unit, cooling water frequency converter is connected with cooling water pump.Programmable Logic Controller in control unit is connected with cold in-water temperature sensor, cooling water leaving water temperature sensors, fan frequency converter and cooling water frequency converter.
The frequency converter matched with power is installed and drags cooling water pump, setting cold in-water temperature and leaving water temperature.When leaving water temperature being detected higher than setting value, mean that air conditioner load increases the weight of, air-conditioner host caloric value increases, and must increase cooling water inflow; When leaving water temperature being detected lower than setting value, mean that air conditioner load alleviates, air-conditioner host caloric value reduces, cooling water inflow can be reduced, thus realize the change of cooling water flow real-time tracking air conditioner load, namely meet the operating mode of air-conditioner host optimizing operation, realize again variable-flow energy-conservation.
The temperature of air-conditioner host cooling water water outlet and flow all follow air conditioner load change, cooling tower fan system by the cooling water after heat absorption, should be forced blowing cooling by blower fan, makes cooling water temperature arrive setting value, enter air-conditioner host again and absorb its heat, enter stable state circulation.When air conditioner load increases the weight of, cooling water flow increases, and the heat of transfer increases, and the air quantity of blower fan of cooling tower must strengthen, and just can distribute the caloric receptivity of cooling water; When air conditioner load alleviates, cooling water flow reduces, and the heat of transfer reduces, and the air quantity of blower fan of cooling tower must reduce.This just makes the air quantity of cooling tower fan system follow the tracks of the energy-saving principle of air conditioner load change.
Further, above-mentioned cooling water pump is two water pumps be arranged in parallel, and is the using and the reserved, also comprises the first power frequency supply, and Controlled by Programmable Controller cooling water pump is connected with cooling water frequency converter or with the first power frequency supply.Wherein arbitrary pump motor can be made to be in variable frequency work state by the control of Programmable Logic Controller; thus realize having a pump motor to be in the adjustable state of capacity at any time; and all the other motors are according to the needs of actual loading; or be in stopped status, or be operated in power frequency state.When thermic load less need pump motor be operated in just can meet the demands lower than power frequency state time, make arbitrary machine operation in frequency conversion state by PLC and switch controller, and running frequency sets according to actual load size.When thermic load increases, drive a motor inadequate, and drive two motors when having a surplus, originally the frequency being operated in frequency conversion state motor automatically can be promoted to power frequency 50Hz from running frequency by PLC, then it is also directly articulated on power frequency supply from frequency converter excision, be articulated on frequency converter by second motor again, make second motor realize level and smooth soft start, running frequency sets according to actual needs.The heap(ed) capacity that system can provide is the full load condition that whole motor is all operated in power frequency.The major loop schematic diagram of system works under power frequency and frequency conversion two states as shown in Figure 3.
Wherein, also comprise the first electric expansion valve, be connected between cooling water pump and blower fan of cooling tower, the first expansion valve is also connected with Programmable Logic Controller.Electric expansion valve is the expansion valve being realized Flow-rate adjustment by programme-control area of passage that the electrical integrated requirement of adaline was released in the eighties in last century.The characteristic of electric expansion valve is obviously better than heating power expansion valve, is embodied in: the aperture of expansion valve is by programme-control.For DPF type electric expansion valve, controller exports as pulse signal.Impulse ejection frequency is: 30 ~ 90PPS.Therefore, have time-lag effect little, regulate fast and the higher advantage of precision.The control of expansion valve generally adopts closed-loop control.Like this, both can adjust setting value very easily, and different variablees can be selected as control objectives simultaneously, be beneficial to choosing optimal plan.By programme-control electric expansion valve, several functions can be realized in systems in which.As: standard-sized sheet or complete shut-down can realize the break-make of refrigeration system, can magnetic valve in replacement system; The given Fast-Balance that can realize high-low pressure of minimum aperture during start, realizes compressor light-load starting; Standard-sized sheet can be utilized to carry out defrosting process etc.
Be provided with chilled water pump, chilled water frequency converter, chilled water inlet temperature sensor, chilled water return water temperature sensor and fan coil in chilled water cycling element, freeze water frequency converter and be connected with chilled water pump.Programmable Logic Controller in control unit is connected with chilled water frequency converter, chilled water inlet temperature sensor and chilled water return water temperature sensor.
The water supply of chilled water is provided by air-conditioner host, and water outlet generally has fixing setting value, and chilled water is pressurizeed by chilled water pump and sends into chilled water pipeline, by the coil pipe in each room, is with interior heat of booking room, the temperature in room is declined.Meanwhile, the heat in room is frozen water and absorbs, and the temperature of chilled water is raised, and is now backwater.Return water temperature depends primarily on the factor such as flowing of temperature in room, personnel, therefore changes greatly.Compared by detection chilled water return water temperature and chilled water temperature setting, this difference is carried out fuzzy operation and control by Programmable Logic Controller.When measured value is less than set-point, mean that air conditioner load alleviates, Frequency Converter Control pump rotary speed reduces, and reduces chilled water output; Measured value is greater than set-point, means that air conditioner load increases the weight of, and Frequency Converter Control pump rotary speed improves, and increases chilled water output, makes chilled water return water temperature level off to set-point.
By the operation stability of system, chilled water frequency converter running frequency should be restricted, and in native system, higher limit is set in 45Hz, and lower limit is set in 30Hz.Higher limit allows frequency converter derate state use, and increases the service life and improve system works reliability; Lower limit is the restriction by the minimum water supply flow of air-conditioner host, makes chilled water output always be greater than minimum water supply flow, the safe operation of protection air-conditioner host.
Further, above-mentioned chilled water pump is two water pumps be arranged in parallel, and is the using and the reserved, also comprises the second power frequency supply, and Controlled by Programmable Controller cooling water pump is connected with cooling water frequency converter or with the second power frequency supply.Identical with above-mentioned cooling water pump with the control principle of power frequency for two pump variable frequencies, do not repeat them here.
Wherein, also comprise the second electric expansion valve, be connected between chilled water pump and fan coil, the second electric expansion valve is also connected with Programmable Logic Controller, i.e. the keying of Controlled by Programmable Controller second electric expansion valve.
Further, also comprise the 3rd power frequency supply, Controlled by Programmable Controller blower fan of cooling tower is connected with fan frequency converter or with the 3rd power frequency supply.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a building structure artificial cold source intelligence control system, the cooling water circulation unit comprising air-conditioner host and be connected with described air-conditioner host and chilled water cycling element, cooling water pump and blower fan of cooling tower is provided with in described cooling water circulation unit, chilled water pump and fan coil is provided with in described chilled water cycling element, it is characterized in that: also comprise control unit, the cooling water frequency converter being provided with Programmable Logic Controller in described control unit and being connected with described Programmable Logic Controller, cold in-water temperature sensor, cooling water leaving water temperature sensors, chilled water frequency converter, chilled water inlet temperature sensor and chilled water return water temperature sensor, described cooling water frequency converter is connected with described cooling water pump, and described chilled water frequency converter is connected with described chilled water pump.
2. a kind of building structure artificial cold source intelligence control system according to claim 1, it is characterized in that: also comprise the first power frequency supply, cooling water pump described in described Controlled by Programmable Controller is connected with described cooling water frequency converter or with described first power frequency supply.
3. a kind of building structure artificial cold source intelligence control system according to claim 2, is characterized in that: described cooling water pump is two water pumps be arranged in parallel.
4. a kind of building structure artificial cold source intelligence control system according to claim 1, it is characterized in that: also comprise the second power frequency supply, chilled water pump described in described Controlled by Programmable Controller is connected with described chilled water frequency converter or with described second power frequency supply.
5. a kind of building structure artificial cold source intelligence control system according to claim 4, is characterized in that: described chilled water pump is two water pumps be arranged in parallel.
6. a kind of building structure artificial cold source intelligence control system according to claim 1, it is characterized in that: also comprise fan frequency converter, described Programmable Logic Controller, described fan frequency converter are connected successively with described blower fan of cooling tower.
7. a kind of building structure artificial cold source intelligence control system according to claim 1, it is characterized in that: also comprise the first electric expansion valve, be connected between described cooling water pump and blower fan of cooling tower, described first expansion valve is also connected with described Programmable Logic Controller.
8. a kind of building structure artificial cold source intelligence control system according to claim 1, it is characterized in that: also comprise the second electric expansion valve, be connected between described chilled water pump and described fan coil, described second expansion valve is also connected with described Programmable Logic Controller.
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| CN201510563975.XA CN105066376A (en) | 2015-09-07 | 2015-09-07 | Artificial cold source intelligent control system of building structure |
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| CN201510563975.XA CN105066376A (en) | 2015-09-07 | 2015-09-07 | Artificial cold source intelligent control system of building structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107238150A (en) * | 2017-06-28 | 2017-10-10 | 贵州绿云科技有限公司 | A kind of cold station system of the double low-temperature receivers of modularization |
| CN109519362A (en) * | 2018-11-14 | 2019-03-26 | 珠海格力电器股份有限公司 | Control method and device of motor equipment, controller and storage medium |
| CN110895016A (en) * | 2019-11-27 | 2020-03-20 | 南京亚派软件技术有限公司 | Fuzzy self-adaptive based energy-saving group control method for central air-conditioning system |
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Application publication date: 20151118 |