CN116697530B - Efficient machine room self-adaptive energy-saving control system and method based on working condition prediction - Google Patents
Efficient machine room self-adaptive energy-saving control system and method based on working condition prediction Download PDFInfo
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- CN116697530B CN116697530B CN202310607171.XA CN202310607171A CN116697530B CN 116697530 B CN116697530 B CN 116697530B CN 202310607171 A CN202310607171 A CN 202310607171A CN 116697530 B CN116697530 B CN 116697530B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 235
- 238000001816 cooling Methods 0.000 claims abstract description 144
- 239000000498 cooling water Substances 0.000 claims abstract description 108
- 230000008859 change Effects 0.000 claims abstract description 40
- 239000000725 suspension Substances 0.000 claims abstract description 37
- 238000007710 freezing Methods 0.000 claims abstract description 25
- 230000008014 freezing Effects 0.000 claims abstract description 25
- 238000004378 air conditioning Methods 0.000 claims description 25
- 238000005339 levitation Methods 0.000 claims description 19
- 230000017525 heat dissipation Effects 0.000 claims description 9
- 230000033228 biological regulation Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 230000003044 adaptive effect Effects 0.000 claims description 3
- 238000004134 energy conservation Methods 0.000 claims description 3
- 238000005057 refrigeration Methods 0.000 description 5
- 239000008400 supply water Substances 0.000 description 5
- 238000007791 dehumidification Methods 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001784 detoxification Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003053 toxin Substances 0.000 description 1
- 231100000765 toxin Toxicity 0.000 description 1
Classifications
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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
- F24F11/46—Improving electric energy efficiency or saving
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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
- F24F11/62—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
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/62—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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/70—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
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
- F24F2110/22—Humidity of the outside air
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/50—Load
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
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- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a working condition prediction-based high-efficiency machine room self-adaptive energy-saving control system and a working condition prediction-based high-efficiency machine room self-adaptive energy-saving control method, wherein the system comprises a central air conditioner tail end unit and high-efficiency machine room equipment, wherein the central air conditioner tail end unit is connected with a controller; a cooling tower and a cooling tower water inlet valve are arranged at one side, close to the cooling water temperature difference bypass, of the interior of the high-efficiency machine room equipment, the cooling tower water inlet valve is positioned at one side, close to the cooling tower, of the cooling pipeline, the cooling tower is positioned at one side, close to the cooling water temperature difference balance valve, of the cooling pipeline, a cooling water return water temperature sensor and a cooling water supply temperature sensor are arranged at the other side of the cooling water temperature difference balance valve, the cooling water return water temperature sensor is positioned at one side, close to the cooling pump, of the cooling pipeline, a magnetic suspension water chilling unit and a freezing pump are arranged at the other side, close to the cooling pump, of the cooling pipeline, and the freezing pump is positioned at one side, close to the magnetic suspension water chilling unit, of the cooling water pipeline; the controller predicts the system cooling change demand for the working condition change, achieves air-water linkage and improves the energy saving rate.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a high-efficiency machine room self-adaptive energy-saving control system and method based on working condition prediction.
Background
At present, a machine room group control system and a central air conditioner terminal unit lack of linkage, the cold quantity change required by terminal equipment and the working condition change of the unit cannot provide effective control for energy conservation of the machine room group control system, and equipment such as a water chilling unit, a refrigerating pump, a cooling pump and a cooling tower in the traditional machine room group control are all independently closed-loop control, and in control, only simple frequency conversion adjustment and equipment load and unload control are realized, so that the energy efficiency of the machine room group control system cannot be effectively controlled under partial load working conditions in transitional seasons and winter, and great energy waste exists.
The patent number CN2019102060847 discloses a multi-air-conditioner automatic control system and a method, which can realize dynamic intelligent remote control on the set temperature and the on-off state of an air conditioner according to the distribution of a plurality of temperature monitoring points in a machine room with separated cold and hot channels so as to reduce the energy waste caused by excessive refrigeration of the air conditioner after the separation of the cold and hot channels of the machine room, but can not predict the system cold change requirement according to the indoor terminal load change and the indoor terminal working condition change, can not realize dynamic self-adaptive control on the high-efficiency machine room system, can not improve the annual energy efficiency COP of the system and reduce the operation cost.
The utility model provides a heating ventilation air conditioner electric automatization control equipment for computer lab that patent number is CN2021225500539, through setting up to the separation and the bradyseism device of the inside components and parts of control equipment, adjustable ventilation sealing device to according to outdoor environment regulation ventilation and leakproofness, avoid environmental impact to lead to control equipment's life, but can't carry out cooling water bypass balance control that adjusts temperature according to outdoor weather condition change, with the energy-conserving rate of the high-efficient computer lab system of the biggest range improvement.
Disclosure of Invention
According to a first aspect of the invention, a high-efficiency machine room self-adaptive energy-saving control system based on working condition prediction is provided, which comprises a central air conditioner terminal unit and high-efficiency machine room equipment, wherein the central air conditioner terminal unit is connected with a controller;
The cooling tower water inlet valve is positioned on one side of the cooling pipeline, which is close to the cooling tower, the cooling tower is positioned on one side of the cooling pipeline, which is close to the cooling water temperature balance valve, the cooling water temperature balance valve is positioned on the other side of the cooling water temperature balance valve, a cooling water return water temperature sensor and a cooling water supply temperature sensor are arranged on one side of the cooling pipeline, which is close to the cooling pump, the cooling water return water temperature sensor is positioned on one side of the cooling pipeline, which is close to the cooling pump, a magnetic suspension water chilling unit and a freezing pump are arranged on the other side of the cooling pump, the magnetic suspension water chilling unit is positioned on one side of the cooling water pipeline, which is close to the cooling pump, and the freezing pump is positioned on one side of the cooling water pipeline, which is close to the magnetic suspension water chilling unit;
The high-efficiency machine room equipment is characterized in that a differential pressure balance valve, a chilled water supply temperature sensor, a chilled water return water temperature sensor, a chilled water supply pressure sensor and a chilled water return water pressure sensor are sequentially arranged inside the high-efficiency machine room equipment and between the water separator and the water collector, and an outdoor temperature and humidity sensor is arranged at the connecting end of the chilled water return water temperature sensor and is positioned on the high-efficiency machine room equipment.
Further, a cooling water flow sensor is arranged in the efficient machine room equipment and positioned at the cooling end of the magnetic suspension water chilling unit.
Further, a refrigerating water flow sensor is arranged in the efficient machine room equipment and located at the refrigerating end of the magnetic suspension water chilling unit.
Further, the cooling water supply temperature sensor is located at one side of the cooling pipe close to the cooling water temperature balance valve and far away from the cooling tower.
Further, the outdoor temperature and humidity sensor is electrically connected with the controller.
Further, the central air-conditioning terminal unit is in communication connection with the controller.
Further, in the inside of high-efficient computer lab equipment, be provided with a plurality of magnetic suspension cooling water set, the cryopump, the cooling pump, the cooling tower, cooling tower water intaking valve, the refrigerated water flow sensor reaches the cooling water flow sensor.
According to a second aspect of the present invention, there is provided a method for controlling energy saving in a machine room, the method comprising the steps of:
step1, a controller collects data information of a central air conditioner tail end unit, a magnetic suspension water chilling unit and various components in real time, and obtains a unit mode working condition;
Step 2, calculating the cold energy demand of the central air conditioner terminal unit according to the target demand of the unit mode working condition on the indoor environment temperature and humidity, and taking the cold energy demand as the combined control data of the cold energy load working condition change demand of the high-efficiency machine room equipment;
And 3, judging the sensible heat and latent heat working condition requirements of the environment of the central air conditioning terminal unit, and taking the combined control data as the regulation data for the dynamic self-adaptive regulation of the water outlet temperature of the magnetic suspension water chilling unit when the condition that the environmental temperature and humidity reach standards is met.
Further, after the self-adaptive adjustment of the magnetic suspension water chilling unit is completed, the self-adaptive adjustment requirements of the freezing pump, the cooling pump and the cooling tower are judged to realize active energy conservation, and the method comprises the following steps:
Step 1, judging the pressure difference of a chilled water pipeline and the end load working condition requirement under the change of the opening of a surface cooling valve of the central air conditioner end unit, and carrying out self-adaptive dynamic adjustment on the chilled pump when the condition that the minimum flow requirement of chilled water is met by the load change under the current working condition of the magnetic suspension water chilling unit;
Step 2, judging the temperature difference requirement of cooling water supply and return water for heat exchange and heat dissipation under the current working condition of the magnetic levitation water chilling unit, and carrying out self-adaptive dynamic adjustment on the cooling pump when the condition of the minimum flow requirement of the cooling water caused by load change under the current working condition of the magnetic levitation water chilling unit is met;
And 3, judging the wet bulb temperature and the approximation degree of the cooling tower, and when the condition that the cooling water backwater temperature reaches the control target value of the cooling water backwater temperature is met, adaptively adjusting the start and stop of a water inlet valve of the cooling tower and the start and stop of a fan of the cooling tower and controlling the frequency load and load shedding.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, on one hand, the controller is used for predicting the change demand of the system cold quantity by changing the outdoor weather condition, the indoor terminal load and the indoor terminal condition, so that the wind-water linkage is realized, the demand and the supply are linked in real time, the energy waste is avoided to the greatest extent, and the electricity is saved.
On the other hand, the invention combines the change of outdoor weather conditions with the change of indoor tail end conditions, and the controller is used for adaptively judging the control requirements of a heating and ventilation system on damp heat and latent heat, so as to dynamically adjust and improve the water outlet temperature of the magnetic suspension water chilling unit, and then combines the self-adaptive dynamic energy-saving control on the condition changes of equipment such as a refrigerating pump, a cooling tower and the like of the high-efficiency machine room system, so that the system can be in an energy-saving and high-efficiency running state under all working conditions all the year round, the energy-saving rate of the high-efficiency machine room system is greatly improved, and the implementation and application of the technical scheme of the invention can support and realize the long-term national strategy of 'double carbon' targets in China for a long time, practice the national green development concept and actively promote the social green low-carbon operation.
It should be understood that all combinations of the foregoing concepts, as well as additional concepts described in more detail below, may be considered a part of the inventive subject matter of the present disclosure as long as such concepts are not mutually inconsistent. In addition, all combinations of claimed subject matter are considered part of the disclosed inventive subject matter.
The foregoing and other aspects, embodiments, and features of the present teachings will be more fully understood from the following description, taken together with the accompanying drawings. Other additional aspects of the invention, such as features and/or advantages of the exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the embodiments according to the teachings of the invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the invention will now be described, by way of example, with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a high-efficiency machine room self-adaptive energy-saving control system based on working condition prediction, which is shown in the invention;
FIG. 2 is a schematic diagram of the module distribution of the high-efficiency machine room adaptive energy-saving control system of the present invention;
In the figure: 1. the system comprises a controller, 2, a central air conditioner terminal unit, 3, an outdoor temperature and humidity sensor, 4, a magnetic suspension water chilling unit, 5, a freeze pump, 6, a cooling pump, 7, a cooling tower, 8, a cooling tower water inlet valve, 9, a chilled water flow sensor, 10, a cooling water flow sensor, 11, a differential pressure balance valve, 12, a cooling water temperature balance valve, 13, a chilled water supply temperature sensor, 14, a chilled water return temperature sensor, 15, a chilled water supply pressure sensor, 16, a chilled water return pressure sensor, 17, a cooling water return temperature sensor, 18 and a cooling water supply temperature sensor.
Detailed Description
For a better understanding of the technical content of the present invention, specific examples are set forth below, along with the accompanying drawings.
The invention relates to a working condition prediction-based high-efficiency machine room self-adaptive energy-saving control system, which is shown in fig. 1 and 2, and comprises a control 1, a central air conditioner tail end unit 2 and high-efficiency machine room equipment, wherein an execution unit of a sensor of the high-efficiency machine room equipment comprises an outdoor temperature and humidity sensor 3, a chilled water flow sensor 9, a cooling water flow sensor 10, a chilled water supply temperature sensor 13, a chilled water return temperature sensor 14, a chilled water supply pressure sensor 15, a chilled water return pressure sensor 16, a cooling water return temperature sensor 17 and a cooling water supply temperature sensor 18; the execution unit of the water system of the high-efficiency machine room equipment comprises a magnetic suspension water chilling unit 4, a freezing pump 5, a cooling pump 6, a cooling tower 7, a cooling tower water inlet valve 8, a differential pressure balance valve 11 and a cooling water temperature balance valve 12.
Wherein, one side that just is close to the cooling water temperature difference bypass of inside of high-efficient computer lab equipment is provided with cooling tower 7 and cooling tower water intaking valve 8, cooling tower water intaking valve 8 is located the cooling pipeline and is close to one side of cooling tower 7, cooling tower 7 is located the cooling pipeline and is close to one side of cooling water temperature balance valve 12, the opposite side of cooling water temperature balance valve 12 is provided with cooling water return water temperature sensor 17 and cooling water supply temperature sensor 18, cooling water supply temperature sensor 18 is located the cooling pipeline and is close to cooling water temperature balance valve 12 and keep away from one side of cooling tower 7, cooling water return water temperature sensor 17 is located the cooling pipeline and is close to one side of cooling pump 6, the opposite side of cooling pump 6 is provided with magnetic suspension cooling water unit 4 and freeze pump 5, magnetic suspension cooling water unit 4 is located the cooling water pipeline and is close to one side of cooling pump 6, freeze pump 5 is located the cooling water pipeline and is close to one side of cooling water unit 4.
In the embodiment of the invention, a differential pressure balance valve 11, a chilled water supply temperature sensor 13, a chilled water return temperature sensor 14, a chilled water supply pressure sensor 15 and a chilled water return pressure sensor 16 are sequentially arranged in the high-efficiency machine room equipment and between the water separator and the water collector, and an outdoor temperature and humidity sensor 3 is arranged on the high-efficiency machine room equipment and at the connecting end of the chilled water return temperature sensor 14.
In an alternative embodiment, a cooling water flow sensor 10 is arranged inside the high-efficiency machine room equipment and positioned at the cooling end of the magnetic levitation water chilling unit 4.
In an alternative embodiment, a chilled water flow sensor 9 is arranged inside the high-efficiency machine room equipment and at the chilled end of the magnetic levitation water chilling unit 4.
In an alternative embodiment, a plurality of magnetic levitation water chilling units 4, cryopump 5, cooling pump 6, cooling tower 7, cooling tower water inlet valve 8, chilled water flow sensor 9 and cooling water flow sensor 10 are arranged in the interior of the high-efficiency machine room equipment.
In an alternative embodiment, the outdoor temperature and humidity sensor 3 is electrically connected to the controller 1, so as to be a control object of the system.
In an alternative embodiment, the central air conditioning terminal unit 2 is communicatively connected to the controller 1 as a linkage object of the system.
As an alternative embodiment, the central air conditioning terminal unit 2 controls the indoor environment temperature and humidity, and provides the cooling capacity supply requirement of the efficient machine room equipment based on the sensible heat and latent heat load in the terminal room.
As an alternative embodiment, the outdoor temperature and humidity sensor 3 detects outdoor weather data (outdoor enthalpy value, wet bulb temperature and moisture content) and participates in the system working condition load operation and system control.
As an alternative embodiment, the magnetic levitation water chilling unit 4 provides cooling capacity for the efficient machine room equipment based on the high efficiency performance of the unit itself (higher COP (energy efficiency ratio) of the heat pump air conditioner) at the running position under partial load.
As an alternative embodiment, the cryopump 5 is adapted to control the flow of chilled water within the system.
As an alternative embodiment, the cooling pump 6 adapts the cooling water flow in the variable frequency control system.
As an alternative embodiment, the cooling tower 7 dissipates heat from the cooling water.
As an alternative embodiment, the cooling tower inlet valve 8 adaptively controls the water flow rate of the cooling tower 7 to stabilize the water flow balance.
As an alternative embodiment, the chilled water flow sensor 9 and the cooling water flow sensor 10 respectively detect the return water flows of the chilled water and the cooling water at the host side so as to feed back the water flow data of the system in real time.
As an alternative embodiment, the differential pressure balancing valve 11 controls the balancing of the water separator and the water collector in the chilled water system by differential pressure.
As an alternative embodiment, the cooling water temperature balance valve 12 controls the cooling water bypass temperature adjustment balance based on the cooling water return temperature requirements of the magnetic levitation water chiller under different operating conditions.
As an alternative embodiment, the chilled water supply pressure sensor 15 and the chilled water return pressure sensor 16 detect the total water pressure of the chilled water supply and return water, so as to ensure the water pressure stability of the system.
In the embodiment of the invention, the problem of energy waste caused by lack of linkage of a machine room group control system and a central air conditioning unit is solved, the data information of the central air conditioning terminal unit 2 is collected through the controller 1, the cold energy requirement required by the central air conditioning terminal unit 2 is calculated by combining the data information of the fresh air ratio of the unit, the outdoor temperature and humidity, the return air temperature and humidity, the supply air temperature and humidity and the supply air volume of the unit under different mode working conditions according to the unit mode working conditions (such as working, duty, disinfection, toxin expelling and shutdown working conditions) and the target requirements of the unit on the indoor environment temperature and humidity, the cold energy requirement required by the central air conditioning terminal unit 2 is calculated as the combined control data of the change requirement of the cold energy load working condition of the efficient machine room system, the sensible heat and the latent heat working condition requirement of the central air conditioning terminal unit 2 are judged according to the information, and the combined control data is used for dynamically and adaptively adjusting the water outlet temperature of the water chilling unit 4 under the condition of the environment temperature and humidity working conditions, and the higher water outlet temperature target value is, and the higher energy efficiency of the magnetically levitated chilling unit 4 reaches the standard.
As an example, the controller 1 collects data information in the outdoor temperature and humidity sensor 3, the chilled water flow sensor 9, the cooling water flow sensor 10, the chilled water supply temperature sensor 13, the chilled water return temperature sensor 14, the chilled water supply pressure sensor 15, the chilled water return pressure sensor 16 and the cooling water return temperature sensor 17 in real time by hard wiring, so as to be used as calculation parameters of the combined control data.
As an example, the controller 1 monitors data information in the cryopump 5, the cooling pump 6, the cooling tower 7, the cooling tower water inlet valve 8, the differential pressure balance valve 11, and the cooling water temperature balance valve 12 in real time by hard wiring as a judgment condition for the change demand of the working condition.
As an example, the controller 1 collects data information in the central air conditioning terminal unit 2 and the magnetic suspension water chilling unit 4 in a communication manner so as to learn the working condition change of the unit mode.
Referring to fig. 1 and 2, the embodiment of the invention discloses a working condition-based high-efficiency machine room self-adaptive energy-saving control method, which comprises the following steps:
step 1, a controller 1 collects data information of a central air conditioner tail end unit 2, a magnetic suspension water chilling unit 4 and various components in real time, and obtains unit mode working conditions;
step 2, calculating the cold energy demand of the central air conditioner terminal unit 2 according to the target demand of the unit mode working condition on the indoor environment temperature and humidity, and taking the cold energy demand as the combined control data of the cold energy load working condition change demand of the high-efficiency machine room equipment;
And 3, judging the sensible heat and latent heat working condition requirements of the environment of the central air conditioning terminal unit 2, and taking the combined control data as the regulation data for the dynamic self-adaptive regulation of the water outlet temperature of the magnetic levitation water chilling unit 4 when the condition that the environment temperature and humidity reach the standard is met.
In the embodiment of the invention, the control 1 acquires the data information of the central air conditioner tail end unit 2, the magnetic suspension water chilling unit 4 and each component in real time in a communication mode; wherein:
The acquired data information comprises: the method comprises the steps of turning on and off a central air conditioner tail end unit 2, unit air supply quantity, surface cooling valve opening, ambient return air temperature and humidity, ambient supply air temperature and humidity, ambient setting temperature and humidity, turning on and off a magnetic suspension water chilling unit 4, fault state, a water outlet temperature target value, water inlet and outlet temperature of a unit evaporator, water inlet and outlet temperature of a unit condenser and unit load;
And comparing each data information with the parameter value range under the corresponding working condition to obtain the working condition of the current unit mode (such as dehumidification, refrigeration, disinfection, detoxification and shutdown working conditions).
According to the target requirement of the unit mode working condition on the indoor environment temperature and humidity, the cold energy requirement of the central air conditioner terminal unit 2 is calculated, wherein:
calculating rated air quantity and fresh air ratio of the unit to obtain fresh air quantity, return air quantity and fresh and return air proportion of the unit;
respectively calculating to obtain an outdoor enthalpy value and an indoor enthalpy value through the outdoor temperature and humidity and the indoor environment return air temperature and humidity;
Calculating the air intake enthalpy value of the surface cooling section after the fresh air and the return air of the unit are mixed by using the outdoor temperature and humidity, the indoor environment return air temperature and humidity and the fresh air and return air proportion;
setting a target value according to the temperature and humidity under the current operation condition of the unit to obtain the air-out enthalpy value of the surface cooling section;
and calculating the cold energy demand by combining the obtained parameter values, wherein the mathematical expression is as follows:
Q＝ρ*V*[h1-h2]
wherein Q is refrigerating capacity, ρ is air density, V is air quantity, h1 is air inlet enthalpy value of the surface cooling section, and h2 is air outlet enthalpy value of the surface cooling section;
The required cooling capacity of all the tail end units under the current operation working condition is summarized through the cooling capacity Q, and the total cooling capacity of the central air-conditioning tail end unit 2 on the high-efficiency machine room equipment is obtained;
The total refrigeration capacity and the rated refrigeration capacity of the high-efficiency machine room equipment are subjected to proportional calculation, and the load rate of the current high-efficiency machine room equipment is obtained;
And based on the load rate, finding out a high-efficiency interval (namely joint control data) by combining the COP energy efficiency percentage distribution of the unit, and carrying out high-efficiency control on high-efficiency machine room equipment.
As an alternative embodiment, ρ (air density) takes a value constant of 1.2.
As an alternative embodiment, V (air volume) is the rated air volume of the unit.
In the embodiment of the invention, a controller 1 sets a target value based on the temperature and humidity of a central air conditioning terminal unit 2 under the current operation condition to calculate a dew point temperature and a dry bulb temperature, finds the minimum value of the dew point temperature and the minimum value of the dry bulb temperature from the dew point temperatures of all the current central air conditioning terminal units 2 under the current operation condition, and detects the outdoor dry bulb temperature by combining an outdoor temperature and humidity sensor 3 to calculate the outdoor dew point temperature; wherein:
When the minimum value of the dew point temperature is more than or equal to the outdoor dew point temperature, the dehumidification working condition is adopted;
When the minimum value of the dew point temperature is less than the outdoor dew point and the minimum value of the dry bulb temperature is less than or equal to the outdoor dry bulb temperature, the refrigerating working condition is adopted;
When the minimum value of the dew point temperature is less than the outdoor dew point and the minimum value of the dry bulb temperature is more than the outdoor dry bulb temperature, the working condition is standby;
based on the dehumidification working condition, the refrigeration working condition and the standby working condition, the water outlet temperature of the magnetic suspension water chilling unit 4 is dynamically and adaptively adjusted so as to save energy, wherein:
when the dehumidification working condition is adopted, the target value of the outlet water temperature is low;
When the refrigerating working condition is adopted, the target value of the outlet water temperature is high;
and when the main machine is in a standby working condition, the target value of the water outlet temperature is high, and the main machine is started and stopped according to the end load requirement.
In the embodiment of the invention, the high-efficiency machine room self-adaptive energy-saving control method based on the working condition prediction is also applied to self-adaptive adjustment of the freezing pump 5, the cooling pump 6 and the cooling tower 7, so that the purpose of active energy saving is achieved, the annual energy consumption of high-efficiency machine room equipment is reduced, and the operation cost is reduced.
As an optional embodiment, judging the pressure difference of a chilled water pipeline and the working condition requirement of the end load under the change of the opening of a surface cooling valve of the central air conditioner end unit 2, and carrying out self-adaptive dynamic adjustment on the chilled pump 5 when the condition that the minimum flow requirement of chilled water is met by the load change of the magnetic levitation water chilling unit 4 under the current working condition is met; wherein:
The controller 1 calculates the pressure difference of the water supply and return according to the collected water supply pressure and water return pressure of the chilled water, and the expression is as follows:
Chilled water supply pressure-chilled water return pressure = supply return pressure differential
Based on the pipeline pressure difference change caused by the surface cooling valve change on the pipeline of the central air conditioning terminal unit 2, comparing the supply water return pressure difference with the supply water return pressure difference target set value, and self-adaptively and dynamically adjusting the frequency of the freezing pump 5;
When the water supply and return pressure difference is more than or equal to the water supply and return pressure difference target set value, reducing the frequency of the freezing pump 5;
When the water supply and return pressure difference is smaller than the water supply and return pressure difference target set value, increasing the frequency of the freezing pump 5;
It should be noted that, based on the fact that the surface cooling valve on the pipeline of the central air conditioning terminal unit 2 is closed, the flow of chilled water required by the central air conditioning terminal unit 2 is reduced, the water supply pressure of the chilled water is increased, the return water pressure of the chilled water is reduced, the pressure difference of the supplied return water is increased, and otherwise, the pressure difference of the supplied return water is reduced;
The controller 1 calculates the supply and return water temperature according to the collected chilled water supply temperature and chilled water return water temperature, and the supply and return water temperature is expressed as follows:
chilled water return temperature-chilled water supply temperature = supply return temperature difference
Based on pipeline temperature difference change caused by system load change of the central air conditioning terminal unit 2, comparing the temperature difference of the water supply and return of chilled water with the target set value of the temperature difference of the water supply and return, and self-adaptively and dynamically adjusting the frequency of the chilled pump 5;
when the temperature difference of the supplied and returned water is more than or equal to the target set value of the temperature difference of the supplied and returned water, the frequency of the freezing pump 5 is increased;
When the temperature difference of the supplied and returned water is smaller than the target set value of the temperature difference of the supplied and returned water, the frequency of the freezing pump 5 is reduced;
it should be noted that, based on the fact that the larger the heat load of the central air conditioning terminal unit 2 is, the larger the chilled water return temperature is, resulting in the larger the supply return water temperature difference, and if the smaller the heat load of the central air conditioning terminal unit 2 is, the smaller the chilled water return temperature is, resulting in the smaller the supply return water temperature difference is;
Based on the rated flow of the magnetic suspension water chilling unit 4 and the minimum flow limiting protection requirement of the freezing side, comparing the real-time flow detected by the chilled water return flow sensor 9 with the minimum flow of the freezing side;
When the real-time flow rate is less than the minimum flow rate at the freezing side, the frequency of the freezing pump 5 is increased;
When the real-time flow is more than or equal to the minimum flow at the freezing side, the frequency of the freezing pump 5 is reduced.
Preferably, the application of the embodiment of the present invention is to reduce the adjusting frequency of the cryopump 5 to increase the energy saving rate of the water pump when the flow requirement of the central air conditioning end unit 2 and the cooling requirement of the central air conditioning end unit 2 (end cooling capacity=end flow×supply water return temperature difference) are satisfied.
As an optional embodiment, judging the temperature difference requirement of heat exchange and heat dissipation cooling water supply and return water under the current working condition of the magnetic levitation water chilling unit 4, and performing self-adaptive dynamic adjustment on the cooling pump 6 when the condition that the load change of the magnetic levitation water chilling unit 4 has the lowest flow requirement on the cooling water under the current working condition is met; wherein:
The controller 1 calculates the temperature difference of the supplied and returned water according to the collected water supply temperature and the collected water return temperature of the cooling water, and the expression is as follows:
cooling water supply temperature-cooling water return temperature = supply return water temperature difference
Based on the load change of the magnetic suspension water chilling unit 4 and the pipeline temperature difference change caused by heat dissipation of the cooling tower 7, comparing the supply water return temperature difference of cooling water with a supply water return temperature difference target set value, and self-adaptively and dynamically adjusting the frequency of the cooling pump 6;
When the temperature difference of the supplied water and the returned water is more than or equal to the target set value of the temperature difference of the supplied water and the returned water, the frequency of the cooling pump is increased;
when the temperature difference of the supplied water and the returned water is smaller than the target set value of the temperature difference of the supplied water and the returned water, reducing the frequency of the cooling pump;
It should be noted that, the temperature difference of the water supply and return is to ensure the basic heat dissipation requirement when the main machine condenser is operating normally, when the heat dissipation load of the main machine condenser is larger, the water supply temperature of the cooling water is larger, and when the heat dissipation load of the main machine condenser is smaller, the water supply temperature of the cooling water is smaller, and the temperature difference of the water supply and return is smaller;
Based on the rated flow of the magnetic suspension water chilling unit 4 and the minimum flow limit protection requirement of the cooling side, comparing the real-time flow detected by the cooling water backwater flow sensor 10 with the minimum flow of the cooling side;
when the real-time flow rate is less than the minimum flow rate of the cooling side, the frequency of the cooling pump 6 is increased;
When the real-time flow rate > the cooling side minimum flow rate, the cooling pump 6 frequency is reduced.
Preferably, the application of the embodiment of the invention is to ensure the basic heat dissipation requirement of the normal operation of the condenser of the host, and reduce the adjusting frequency of the cooling pump 6 to increase the energy saving rate of the water pump.
As an alternative embodiment, judging the wet bulb temperature and the approximation degree of the cooling tower 7, and when the condition that the cooling water backwater temperature reaches the cooling water backwater temperature control target value is met, adaptively adjusting the start and stop of the water inlet valve 8 of the cooling tower and the start and stop of the fan of the cooling tower 7 and controlling the frequency loading and unloading; wherein:
The controller 1 calculates the outdoor wet bulb temperature according to the collected outdoor temperature and humidity, and combines the corresponding approximation degree of the cooling tower 7 to obtain a cooling water backwater temperature control target value, and the expression formula is as follows:
Outdoor wet bulb temperature + approximation = cooling water backwater temperature control target value
Comparing the cooling water backwater temperature control target value with the cooling water backwater temperature, and adjusting the start and stop of a water inlet valve 8 of the cooling tower and the start and stop of a fan of the cooling tower 7 and the frequency load reducing control;
When the return water temperature of the cooling water is more than or equal to the return water temperature control target value of the cooling water, gradually loading the quantity of the water inlet valves 8 of the cooling tower based on the lowest flow of the cooling water, starting a fan corresponding to the cooling tower 7 at the same time, and loading the frequency of the fan;
When the return water temperature of the cooling water is less than the return water temperature control target value of the cooling water, the inlet water of the cooling tower is gradually reduced by 8 based on the lowest flow of the cooling water, the fans corresponding to the cooling tower 7 are stopped at the same time, and the frequency of the fans is reduced.
As an alternative embodiment, the controller 1 calculates the water supply pressure difference according to the collected chilled water supply pressure and chilled water return pressure, and self-adaptively and dynamically adjusts the pressure difference balance valve 11 according to the pipeline pressure difference change caused by the surface cooling valve on the pipeline of the central air conditioner tail end unit 2 and the minimum flow demand change caused by the load change of the magnetic suspension water chilling unit 4; wherein:
When the water supply and return pressure difference is larger than the water supply and return temperature difference target set value and the cooling pump 6 is lowered to the lowest frequency and still cannot meet the requirement of the current working condition of the magnetic levitation unit 4 on the minimum flow rate of the chilled water, the pressure difference target value of the pressure difference balance valve 11 is adaptively and dynamically lowered, so that the pressure difference balance valve 11 is opened, part of chilled water is directly returned to the host side, the minimum flow rate requirement of the magnetic levitation unit 4 is guaranteed, and the magnetic levitation unit can normally operate.
As an alternative embodiment, the controller 1 adaptively adjusts the opening of the cooling water temperature balance valve 12 according to the collected cooling water return temperature and the requirement of the load change of the magnetic levitation water chilling unit 4 on the cooling water return temperature; wherein:
the cooling water temperature difference balancing valve 12 mixes the cooling water supply back temperature (unit cooling water supply high temperature) with the cooling water return temperature (low temperature) through the bypass cooling water supply back temperature, so as to ensure that the mixed cooling water return temperature can be raised and is ensured to be higher than the minimum starting temperature limit.
As an optional embodiment, the controller 1 performs equal-abrasion load-adding and load-reducing control according to the collected running time and equipment fault state of the magnetic suspension water chilling unit 4, the matched freezing pump 5 and cooling pump 6 and the equipment working condition change load demand of the high-efficiency machine room equipment; wherein:
judging whether the magnetic suspension water chilling unit 4, the freezing pump 5 and the cooling pump 6 need to be subjected to load and unload control or not based on the change requirement of the total cold quantity of the central air conditioning terminal unit 2;
comparing the running time records of the magnetic suspension water chilling unit 4, the freezing pump 5 and the cooling pump 6, selecting a group with the smallest current running time, and loading;
And comparing the running time records of the magnetic suspension water chilling unit 4, the freezing pump 5 and the cooling pump 6, selecting a group with the largest current running time, and performing load shedding.
As an alternative embodiment, the controller 1 performs equal-abrasion load-reducing control according to the collected running time and equipment fault state of the cooling tower 7 and the cooling tower water inlet valve 8 and the load demand according to the working condition change of the cooling water system; wherein:
Judging whether the load-adding and load-subtracting control of the cooling tower 7 and the cooling tower water inlet valve 8 is required or not based on the heat dissipation requirement (comparison between the cooling water backwater temperature and the cooling water backwater temperature control target value) of the host cooling water system;
comparing the running time records of the cooling tower 7 and the cooling tower water inlet valve 8, selecting a group with the smallest current running time, and loading;
And comparing the running time records of the cooling tower 7 and the cooling tower water inlet valve 8, selecting a group with the largest current running time, and carrying out load shedding.
Preferably, the application of the efficient machine room self-adaptive energy-saving control method based on working condition prediction combines the energy efficiency characteristics of the magnetic suspension water chilling unit 4, so that the partial load space of the efficient machine room is excavated to the maximum extent, the annual energy efficiency COP of the efficient machine room system is effectively improved, and meanwhile, the annual energy consumption of the efficient machine room system is reduced due to the reduction of the electric energy of the efficient machine room equipment under partial load, so that the operation cost is reduced.
The working condition change demand and load calculation method of the efficient machine room system can be performed by means of a mode and a means in the prior art, and are not repeated in this example.
While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the invention is defined by the appended claims.
Claims (7)
1. The efficient machine room self-adaptive energy-saving control system based on the working condition prediction is characterized by comprising a central air conditioner tail end unit (2) and efficient machine room equipment, wherein the central air conditioner tail end unit is connected with a controller (1);
the cooling tower water inlet valve (8) is arranged at one side, which is close to the bypass of the cooling water temperature difference, of the inside of the efficient machine room equipment, the cooling tower water inlet valve (8) is positioned at one side, which is close to the cooling tower (7), of the cooling pipeline, the cooling tower (7) is positioned at one side, which is close to the cooling water temperature balance valve (12), of the cooling pipeline, the cooling water temperature balance valve (12) is provided with a cooling water backwater temperature sensor (17) and a cooling water supply temperature sensor (18), the cooling water backwater temperature sensor (17) is positioned at one side, which is close to the cooling pump (6), of the cooling pipeline, the other side, which is close to the cooling pump (6), of the magnetic suspension water chilling unit (4) and the freezing pump (5) are positioned at one side, which is close to the cooling water chilling unit (4), of the cooling water pipeline;
The high-efficiency machine room equipment is internally provided with a differential pressure balance valve (11), a chilled water supply temperature sensor (13), a chilled water return water temperature sensor (14), a chilled water supply pressure sensor (15) and a chilled water return water pressure sensor (16) which are positioned between the water separator and the water collector in sequence, and an outdoor temperature and humidity sensor (3) is arranged on the high-efficiency machine room equipment and positioned at the connecting end of the chilled water return water temperature sensor (14);
The high-efficiency machine room self-adaptive energy-saving control system is configured to realize the control process according to the following mode:
step 1, a controller (1) acquires data information of a central air-conditioning tail end unit (2), a magnetic suspension water chilling unit (4) and various components in real time, and acquires unit mode working conditions;
Step 2, calculating the cold energy demand of the central air conditioner terminal unit (2) according to the target demand of the unit mode working condition on the indoor environment temperature and humidity, and taking the cold energy demand as the combined control data of the cold energy load working condition change demand of the high-efficiency machine room equipment;
Step 3, judging the sensible heat and latent heat working condition requirements of the environment of the central air conditioning terminal unit (2), and taking the combined control data as the control data for dynamic self-adaptive regulation of the water outlet temperature of the magnetic levitation water chilling unit (4) when the condition that the environment temperature and humidity reach standards is met;
After the self-adaptive adjustment of the magnetic suspension water chilling unit (4) is completed, the self-adaptive adjustment requirements of the freezing pump (5), the cooling pump (6) and the cooling tower (7) are judged, so that active energy conservation is realized, and the method comprises the following steps:
step 1, judging the pressure difference of a chilled water pipeline and the working condition requirement of a tail load under the change of the opening of a surface cooling valve of a central air conditioner tail end unit (2), and carrying out self-adaptive dynamic adjustment on a chilled pump (5) when the condition that the minimum flow requirement of chilled water is met by the load change under the current working condition of a magnetic suspension water chilling unit (4);
Step 2, judging the temperature difference requirement of cooling water supply and return water for heat exchange and heat dissipation under the current working condition of the magnetic levitation water chilling unit (4), and carrying out self-adaptive dynamic adjustment on the cooling pump (6) when the condition that the load change of the magnetic levitation water chilling unit (4) has the minimum flow requirement on the cooling water under the current working condition is met;
And 3, judging the wet bulb temperature and the approximation degree of the cooling tower (7), and when the condition that the cooling water backwater temperature reaches the cooling water backwater temperature control target value is met, adaptively adjusting the start and stop of a water inlet valve (8) of the cooling tower and the start and stop of a fan of the cooling tower (7) and controlling the frequency loading and unloading.
2. The efficient machine room self-adaptive energy-saving control system based on working condition prediction according to claim 1, wherein a cooling water flow sensor (10) is arranged inside the efficient machine room equipment and positioned at a cooling end of the magnetic suspension water chilling unit (4).
3. The efficient machine room self-adaptive energy-saving control system based on working condition prediction according to claim 2, wherein a chilled water flow sensor (9) is arranged inside the efficient machine room equipment and at a freezing end of the magnetic suspension water chilling unit (4).
4. A high-efficiency machine room adaptive energy-saving control system based on working condition prediction according to claim 1, characterized in that the cooling water supply temperature sensor (18) is located at a side of a cooling pipe close to the cooling water temperature balance valve (12) and far from the cooling tower (7).
5. The efficient machine room self-adaptive energy-saving control system based on working condition prediction according to claim 1, wherein the outdoor temperature and humidity sensor (3) is electrically connected with the controller (1).
6. The efficient machine room self-adaptive energy-saving control system based on working condition prediction according to claim 1, wherein the central air conditioner terminal unit (2) is in communication connection with the controller (1).
7. A high-efficiency machine room adaptive energy-saving control system based on working condition prediction according to claim 3, characterized in that a plurality of magnetic levitation water chilling units (4), the cryopump (5), the cooling pump (6), the cooling tower (7), the cooling tower water inlet valve (8), the chilled water flow sensor (9) and the cooling water flow sensor (10) are arranged in the interior of the high-efficiency machine room equipment.
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| CN101089503A (en) * | 2007-07-06 | 2007-12-19 | 北京时代嘉华环境控制科技有限公司 | Quality and regulation control method and system for chill station of central air conditioner |
| JP2011141072A (en) * | 2010-01-06 | 2011-07-21 | Hitachi Plant Technologies Ltd | Cooling system and cooling method |
| CN106051959A (en) * | 2016-07-08 | 2016-10-26 | 上海大学 | Energy conservation optimization system for central air conditioner |
| CN114942584A (en) * | 2022-05-31 | 2022-08-26 | 南京福加自动化科技有限公司 | Efficient machine room energy-saving control method based on magnetic suspension water chilling unit load optimization |
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| CN101089503A (en) * | 2007-07-06 | 2007-12-19 | 北京时代嘉华环境控制科技有限公司 | Quality and regulation control method and system for chill station of central air conditioner |
| JP2011141072A (en) * | 2010-01-06 | 2011-07-21 | Hitachi Plant Technologies Ltd | Cooling system and cooling method |
| CN106051959A (en) * | 2016-07-08 | 2016-10-26 | 上海大学 | Energy conservation optimization system for central air conditioner |
| CN114942584A (en) * | 2022-05-31 | 2022-08-26 | 南京福加自动化科技有限公司 | Efficient machine room energy-saving control method based on magnetic suspension water chilling unit load optimization |
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