CN114413458B - Water pump parallel operation control method, device, equipment and medium for air-conditioning water system - Google Patents
Water pump parallel operation control method, device, equipment and medium for air-conditioning water system Download PDFInfo
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- CN114413458B CN114413458B CN202210088234.0A CN202210088234A CN114413458B CN 114413458 B CN114413458 B CN 114413458B CN 202210088234 A CN202210088234 A CN 202210088234A CN 114413458 B CN114413458 B CN 114413458B
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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
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
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Abstract
The application discloses water pump parallel operation control method, device, equipment and medium of air conditioner water system, wherein the method includes: the method has the advantages that the actual operation parameters such as the flow of an air conditioner cold water system and a cooling water system header pipe, the water pressures of the front and the back of the water pumps, the number of running water pumps, the running frequency and the running power of the water pumps are monitored in real time, the running number and the running frequency of the parallel water pumps are optimized and set by combining a water pump sample curve and providing control logic. Therefore, the number and the frequency of the running units of the air conditioner cold water pump and the cooling water pump can be automatically adjusted and optimized according to the actual cooling demand under different running working conditions in the cooling season, so that the high-efficiency running can be maintained for a long time, and the running energy consumption of the air conditioner water system can be reduced. Therefore, the problems that the traditional air-conditioning water system lacks the measurement of actual operation efficiency and the operation regulation and control based on the advance efficiency prediction are carried out by combining the performance curve of the water pump and the like are solved.
Description
Technical Field
The application relates to the technical field of automatic control of air-conditioning systems, in particular to a method, a device, equipment and a medium for controlling parallel operation of water pumps of an air-conditioning water system.
Background
The air conditioning system consumes a large amount of energy while providing a healthy and comfortable indoor environment for the building, and according to statistics, the energy consumption of the air conditioning system accounts for about 30-50% of the total energy consumption of public buildings. Therefore, the energy-saving control of the air conditioning system has important significance for the energy saving of public buildings and the energy saving work in the whole building field. The air-conditioning water system comprises a cold water system and a cooling water system, and consumes a large amount of energy while bearing the functions of conveying cold water to supply cold for buildings and conveying cooling water to discharge heat for a water chiller, and the energy consumption accounts for approximately 20-50% of the total energy consumption of the air-conditioning system, so that the efficient operation and energy-saving regulation and control of the air-conditioning water system are also very important.
For a large public building, an air conditioning water system and a cooling water system usually adopt a plurality of water pumps to run in parallel, how to realize the combined regulation and control of the number and the frequency of the water pumps is realized, and the key point of the operation regulation and control is that the running efficiency of the water pumps is improved as much as possible on the basis of meeting the hydraulic circulation.
In the related art, for an air-conditioning water pump combined operation regulation strategy, simple adjustment of a water pump, increase and decrease and frequency regulation are usually realized only for meeting water supply requirements, and the operation regulation based on the advance efficiency prediction by measuring the actual operation efficiency and combining with a performance curve of the water pump is lacked. Particularly, for different operation conditions in cold seasons, the related technology cannot realize real-time and automatic adjustment of the number and frequency of water pumps according to the changed cold supply requirements, and cannot enable an air conditioner cold water system and a cooling water system to maintain efficient operation for a long time so as to reduce the energy consumption of system operation, and needs to be solved urgently.
Disclosure of Invention
The application provides a water pump parallel operation control method, device, equipment and medium for an air-conditioning water system, so that for different operation working conditions in cold season, an air-conditioning water pump combined operation regulation strategy can realize real-time and automatic regulation of the number and frequency of water pumps according to actual cold supply requirements, and therefore the air-conditioning water cooling system and a cooling water system can maintain efficient operation for a long time, and the operation energy consumption of the system is reduced.
An embodiment of a first aspect of the present application provides a method for controlling parallel operation of water pumps, including the following steps: calculating the current operation flow and the current operation efficiency of each water pump and the current operation resistance coefficient of the air-conditioning water system according to the current operation state parameters of the air-conditioning water system and the head-flow performance curve relation and the efficiency-flow performance curve relation of the air-conditioning water system; comparing the current operation flow with a preset working flow, and determining an initial adjustment strategy of the air-conditioning water system according to a first comparison result after comparison; and comparing the operating efficiency and the operating resistance coefficient of each water pump in the current operating state and the initial adjustment strategy, generating an optimal adjustment strategy of the air-conditioning water system according to a second comparison result after comparison, and controlling the air-conditioning water system to work according to the optimal adjustment strategy.
Optionally, in an embodiment of the application, before calculating the current operating flow and the current operating efficiency of each water pump and the current operating resistance coefficient of the air-conditioning water system, the method further includes:
determining the performance curve relationship of the head-flow and the performance curve relationship of the efficiency-flow of the air-conditioning water system:
H＝a*G 2 +b*G+c
η＝d*G 2 +e*G+p
wherein H is the running lift of the water pump; g is the running flow of the water pump; eta is the operating efficiency of the water pump; a. b, c, d, e and p are fitting coefficients.
Optionally, in an embodiment of the present application, calculating a current operation flow and a current operation efficiency of each water pump and a current operation resistance coefficient of the air-conditioning water system includes:
G i ＝G t /N
η i ＝H*G i /W i
S＝H/G t 2
wherein G is i The operation flow of the ith water pump is set; g t Is the main pipe flow; n is the number of the water pumps started; eta i The operation efficiency of the ith water pump is obtained; and S is the running resistance coefficient of the air-conditioning water system.
Optionally, in an embodiment of the present application, before comparing the current operating flow with a preset working flow, the method further includes:
calculating the highest corresponding working flow G' of the efficiency of the water pump under the current frequency:
wherein f is the operating frequency of the water pump, G 0 Rated working flow rate of the water pump;
and determining a preset working flow maximum value and a preset working flow minimum value according to the highest efficiency corresponding working flow under the current frequency of the water pump.
Optionally, in an embodiment of the application, the comparing the current operation flow with a preset operation flow, and determining an initial adjustment strategy of the air-conditioning water system according to a compared first comparison result includes:
when the current operation flow of the water pump is smaller than the preset minimum working flow and the number of the started water pumps is equal to one, keeping the number of the started water pumps and the working frequency unchanged;
when the current operation flow of the water pump is larger than the maximum value of the preset working flow and the number of the started current water pumps is equal to the maximum value of the number of the started preset water pumps, keeping the number of the started current water pumps and the working frequency unchanged;
when the current operation flow of the water pump is more than or equal to the preset minimum working flow and less than or equal to the preset maximum working flow, keeping the number of the current water pumps started and the working frequency unchanged;
when the current operation flow of the water pumps is smaller than the preset minimum working flow and the number of the current water pumps which are started is larger than one, the number of the current water pumps which are started is reduced by one;
and when the current operating flow of the water pump is greater than the preset maximum working flow and the current number of the opened water pumps is less than the preset maximum number of the opened water pumps, adding one to the current number of the opened water pumps.
Optionally, in an embodiment of the application, the comparing the operating efficiency and the operating resistance coefficient of each water pump in the current operating state and the initial adjustment strategy, and generating the optimal adjustment strategy for the air-conditioning water system according to a second comparison result after the comparing includes:
respectively calculating the equivalent resistance coefficient and the water pump operation efficiency of each water pump after adding and reducing one water pump:
S i ＝N 2 *S
wherein S is i Equivalent resistance coefficients for each running water pump; eta 'of' i Predicting the operation efficiency of the water pump after adjustment; d. e and p are fitting coefficients;
when the operation efficiency of the water pump after one water pump is increased or decreased is less than or equal to the operation efficiency of the water pump in the current operation state, keeping the number of the started water pumps and the working frequency unchanged;
when the operation efficiency of the water pump after one water pump is increased or reduced is higher than that of the water pump in the current operation state, calculating the flow of each water pump after one water pump is increased or reduced, and calculating the corresponding rated flow of the current water pump equivalent resistance coefficient according to a water pump lift-flow curve formula and a calculation formula of the water pump equivalent resistance coefficient:
wherein H 0 Corresponding to the current equivalent resistance coefficient of the water pump with rated lift; g i,0 Corresponding to the current equivalent resistance coefficient of the water pump with rated flow; s i Equivalent resistance coefficient of each running water pump; a. b and c are fitting coefficients;
according to the flow G of each water pump after increasing or decreasing one water pump i Rated flow G corresponding to current water pump equivalent resistance coefficient i,0 Calculating the water pump frequency f after adding or reducing one water pump:
f＝G i /G i,0
judging whether the frequency f of the water pump after increasing or decreasing one water pump is in a preset frequency range, if not, keeping the number of the started water pumps and the working frequency unchanged; and if so, adjusting the air-conditioning water system according to the initial adjustment strategy to generate an optimal adjustment strategy of the air-conditioning water system.
The embodiment of the second aspect of the present application provides a water pump parallel operation control device, including: the calculation module is used for calculating the current operation flow and the current operation efficiency of each water pump and the current operation resistance coefficient of the air-conditioning water system according to the current operation state parameters of the air-conditioning water system and the head-flow performance curve relation and the efficiency-flow performance curve relation of the air-conditioning water system; the optimization module is used for comparing the current operation flow with a preset working flow and determining an initial adjustment strategy of the air-conditioning water system according to a compared first comparison result; and the control module is used for comparing the operating efficiency and the operating resistance coefficient of each water pump in the current operating state and the initial adjustment strategy, generating an optimal adjustment strategy of the air-conditioning water system according to a second comparison result after comparison, and controlling the air-conditioning water pump system to work according to the optimal adjustment strategy.
Optionally, in an embodiment of the present application, the method further includes:
the first determining module is used for determining the head-flow performance curve relation and the efficiency-flow performance curve relation of the air-conditioning water system:
H＝a*G 2 +b*G+c
η＝d*G 2 +e*G+p
wherein H is the running lift of the water pump; g is the running flow of the water pump; eta is the operating efficiency of the water pump; a. b, c, d, e and p are fitting coefficients.
Optionally, in an embodiment of the present application, the calculation module is specifically configured to,
G i ＝G t /N
η i ＝H*G i /W i
S＝H/G t 2
wherein G is i The operation flow of the ith water pump is set; g t Is the main pipe flow; n is the number of the water pumps which are started; eta i The operation efficiency of the ith water pump is calculated; and S is the running resistance coefficient of the air-conditioning water system.
Optionally, in an embodiment of the present application, the method further includes:
the second determining module is used for calculating the highest corresponding working flow G' of the efficiency of the water pump under the current frequency:
wherein f is the operating frequency of the water pump, G 0 Rated working flow for the water pump;
and determining a preset working flow maximum value and a preset working flow minimum value according to the highest efficiency corresponding working flow of the water pump under the current frequency.
Optionally, in an embodiment of the present application, the optimization module is, in particular,
when the current operation flow of the water pumps is smaller than the preset minimum working flow and the number of the current water pump starting units is equal to one, keeping the number of the current water pump starting units and the working frequency unchanged; when the current operation flow of the water pump is larger than the preset maximum working flow and the current number of the opened water pumps is equal to the preset maximum number of the opened water pumps, keeping the current number of the opened water pumps and the working frequency unchanged;
when the current operation flow of the water pump is greater than or equal to the preset working flow minimum value and less than or equal to the preset working flow maximum value, keeping the number of the current water pumps which are started and the working frequency unchanged;
when the current operation flow of the water pumps is smaller than the preset minimum working flow and the number of the started water pumps is larger than one, reducing the number of the started water pumps by one;
and when the current operating flow of the water pump is greater than the preset maximum working flow and the current number of the opened water pumps is less than the preset maximum number of the opened water pumps, adding one to the current number of the opened water pumps.
Optionally, in an embodiment of the present application, the control module, in particular for,
respectively calculating the equivalent resistance coefficient and the water pump operation efficiency of each water pump after increasing and reducing one water pump:
S i ＝N 2 *S
wherein S is i Equivalent resistance coefficient of each running water pump; eta 'of' i Predicting the operation efficiency of the water pump after adjustment; d. e and p are fitting coefficients;
when the operation efficiency of the water pump after one water pump is increased or decreased is less than or equal to that of the water pump in the current operation state, keeping the number of the started water pumps and the working frequency unchanged;
when the operation efficiency of the water pump after one water pump is increased or reduced is higher than that of the water pump in the current operation state, calculating the flow of each water pump after one water pump is increased or reduced, and calculating the corresponding rated flow of the current water pump equivalent resistance coefficient according to a water pump lift-flow curve formula and a calculation formula of the water pump equivalent resistance coefficient:
wherein H 0 Corresponding to the current equivalent resistance coefficient of the water pump with rated lift; g i,0 Corresponding to the current equivalent resistance coefficient of the water pump with rated flow; s i Equivalent resistance coefficients for each running water pump; a. b and c are fitting coefficients;
according to the flow G of each water pump after increasing or decreasing one water pump i Rated flow G corresponding to current water pump equivalent resistance coefficient i,0 Calculating the water pump frequency f after adding or reducing one water pump:
f＝G i /G i,0
judging whether the frequency f of the water pump after increasing or decreasing one water pump is in a preset frequency range, if not, keeping the number of the started water pumps and the working frequency unchanged; and if so, adjusting the air-conditioning water system according to the initial adjustment strategy to generate an optimal adjustment strategy of the air-conditioning water system.
An embodiment of a third aspect of the present application provides an electronic device, including: the system comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the program to execute the water pump parallel operation control method of the air-conditioning water system.
A fourth aspect of the present invention provides a computer-readable storage medium, having a computer program stored thereon, where the computer program is executed by a processor to execute the method for controlling parallel operation of water pumps of an air-conditioning water system according to the above embodiment.
Therefore, the application has at least the following beneficial effects:
on the basis of not additionally installing sensor hardware, the current running state of the air-conditioning water system is determined by monitoring the existing sensors of the air-conditioning cold water system and the cooling water system. And then, according to the change conditions of the circulation flow and the system lift, the combination of the optimum starting number and the operation frequency of the water pumps is calculated by combining the self lift-flow performance curve and the efficiency-flow performance curve of the water pumps, so that the operation regulation and control of the water pumps connected in parallel are guided, and the optimum operation efficiency of the water pumps is realized. Through the functions of automatic monitoring, automatic identification, automatic setting and automatic control, the real-time and automatic adjustment of the running number and frequency of the parallel water pumps can be realized according to the changed hydraulic power supply requirement under different running conditions of the air-conditioning water cooling system and the cooling water system in cooling seasons, so that the air-conditioning water system can maintain high-efficiency running for a long time, and the running energy consumption of the system is reduced. Therefore, the problems that the air-conditioning water system lacks the measurement of actual operation efficiency, and operation regulation and control based on advance efficiency prediction are carried out by combining the performance curve of the water pump and the like are solved.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a parallel operation control method for water pumps of an air-conditioning water system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a water pump parallel operation control system of an air-conditioning water system according to an embodiment of the present application;
fig. 3 is a schematic diagram illustrating an implementation logic of a parallel operation control method for water pumps of an air-conditioning water system according to an embodiment of the present application;
fig. 4 is an exemplary diagram of a water pump parallel operation control device of an air-conditioning water system according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Description of reference numerals: a calculation module-100, an optimization module-200, a control module-300, a memory-501, a processor-502, and a communication interface-503.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The following describes a method, a device, equipment and a medium for controlling parallel operation of water pumps of an air-conditioning water system according to an embodiment of the present application with reference to the accompanying drawings. In order to solve the problems mentioned in the background technology, the application provides a control method for parallel operation of water pumps of an air-conditioning water system. And then, according to the change conditions of the circulation flow and the system lift, the combination of the self-lift-flow performance curve and the efficiency-flow performance curve of the water pump is combined, and the optimal number of the water pumps which are started and the operation frequency combination are calculated, so that the operation regulation and control of the water pumps connected in parallel are guided, and the optimal operation efficiency of the water pumps is realized. Through the functions of automatic monitoring, automatic identification, automatic setting and automatic control, the real-time and automatic adjustment of the running number and frequency of the parallel water pumps is realized according to the changed hydraulic power supply requirement under different running working conditions of an air-conditioning cold water system and a cooling water system in a cooling season, so that the air-conditioning water system can maintain high-efficiency running for a long time, and the running energy consumption of the system is reduced. Therefore, the problems that the air-conditioning water system lacks the measurement of actual operation efficiency and operation regulation and control based on the advance efficiency prediction are carried out by combining the performance curve of the water pump and the like are solved.
Specifically, fig. 1 is a schematic flow chart of a control method for parallel operation of water pumps of an air-conditioning water system according to an embodiment of the present application.
As shown in fig. 1, the method for controlling the parallel operation of the water pumps of the air-conditioning water system comprises the following steps:
in step S101, a current operation flow and a current operation efficiency of each water pump and a current operation resistance coefficient of the air-conditioning water system are calculated according to the current operation state parameter of the air-conditioning water system, and the head-flow performance curve relationship and the efficiency-flow performance curve relationship of the air-conditioning water system.
In an embodiment of the application, the air-conditioning water system comprises an air-conditioning water pump unit, a water supply pipe unit, a tail end/cooling tower unit, a return water pipe unit and a water pump control box unit. The air conditioner water pump unit is connected with the water supply water pipe unit, the water supply water pipe unit is connected with the tail end/cooling tower unit, the tail end/cooling tower unit is connected with the air conditioner water return water pipe unit, the air conditioner water return water pipe unit is connected with the air conditioner water pump unit, and the air conditioner water pump unit, the water supply water pipe unit, the water return water pipe unit and the water pump control box unit are shown in fig. 2.
Air conditioner cold water is conveyed to the tail end through a water supply pipe to carry out cooling and warming under the driving of a cold water pump, and then enters a water chilling unit evaporator through a water return pipe to carry out cooling and cooling again. The cooling water of the air conditioner is conveyed to a cooling tower through a water supply pipe to remove heat and cool under the driving of a cooling water pump, and then enters a condenser of a water chilling unit through a return water pipe to absorb heat in the condenser again.
Specifically, the current operating state parameters of the air-conditioning water system comprise the number N of water pumps started, the operating frequency f (unit Hz), and the flow G of a water supply pipe t (unit m) 3 H), pump head H (unit mH) 2 O), water pump operating power W i (unit kW), water supply and return pressure difference of a water system, circulating flow rate and the like. The air conditioner water pump unit is provided with a water pump operation number sensor, an operation frequency sensor and a power sensor, the water supply pipe is provided with a pressure sensor and a flow sensor, and the return water pipe is provided with a pressure sensor.
In addition, the air-conditioning water pump unit comprises a plurality of variable-frequency water pumps which are operated in a combined mode, the frequency of the water pumps is adjustable from 20Hz to 50Hz, and the hydraulic circulation requirements are met through the combined adjustment of the number of the water pumps and the frequency. Each water pump has a rated performance curve comprising a lift-flow curve and an efficiency-flow curve, and the operating working points and the operating efficiency of the water pumps under different flows are quantitatively depicted.
It should be understood that the actual operating point of the water pump is determined by the head-flow curve of the water pump and the resistance characteristic of the end pipe network. When the resistance characteristic of the tail end pipe network is increased, the flow rate of the water pump is reduced, the lift is increased, namely the working point of the water pump correspondingly moves leftwards on the lift-flow curve. When the resistance characteristic of the tail end pipe network is reduced, the flow rate of the water pump is increased, the lift is reduced, namely the working point of the water pump correspondingly moves rightwards on a lift-flow curve. The highest operating efficiency of the water pump corresponds to the rated working flow and the lift, and when the actual working point of the water pump is more on the left or on the right, the actual operating efficiency of the water pump is reduced. When the water pumps are operated in parallel, the pressure of the water outlet of each water pump is influenced by the operating pressure of other water pumps, the equivalent resistance of the corresponding tail end pipe network is increased, namely the actual working point of each water pump is left-biased. In the actual operation process, along with the change of the cooling demand of the building, the operation flow of a water system and the actual resistance coefficient of the tail end can change in real time, and at the moment, the hydraulic supply demand of the tail end change can be met by adjusting the number and the frequency of the operation units of the water pumps.
Optionally, in an embodiment of the present application, before calculating the current operating flow and the current operating efficiency of each water pump and the current operating resistance coefficient of the air-conditioning water system, the method further includes:
determining the relation of a lift-flow performance curve and the relation of an efficiency-flow performance curve of an air-conditioning water system, namely fitting the relation of a water pump operation lift-flow and efficiency-flow performance curve according to a water pump sample performance curve, and determining fitting coefficients as shown in formula (1) and formula (2):
H＝a*G 2 +b*G+c (1)
η＝d*G 2 +e*G+p (2)
wherein H is the pump head in mH 2 O; g is the running flow of the water pump in unit m 3 H; eta is the operating efficiency of the water pump and is a dimensionless parameter; a. b, c, d, e and p are fitting coefficients.
Optionally, in an embodiment of the present application, calculating a current operating flow and a current operating efficiency of each water pump and a current operating resistance coefficient of the air-conditioning water system, as shown in equations (3), (4), and (5), includes:
G i ＝G t /N (3)
η i ＝H*G i /W i (4)
S＝H/G t 2 (5)
wherein G is i The flow of each water pump is uniformly distributed according to the parallel operation of the water pumps, and the flow of the main pipe is G t Divided by the number of runs N to obtain the unit m 3 /h；η i The operation efficiency of each water pump is free of dimensional parameters; s is the running resistance coefficient of the front water system, unit mH 2 O*h 2 /m 6 。
In step S102, the current operation flow is compared with a preset operation flow, and an initial adjustment strategy of the air conditioning water system is determined according to a first comparison result after comparison.
Optionally, in an embodiment of the present application, before comparing the current operating flow with the preset working flow, the method further includes:
calculating the highest efficiency corresponding working flow G' of the water pump at the current frequency at the rated working point as shown in the formula (6):
wherein G' is the corresponding flow rate of the rated working point of the water pump at the current frequency and the unit m 3 H; f is the current running frequency of the water pump in Hz; g 0 Is the rated working flow of the water pump, namely the working flow corresponding to the highest efficiency point, unit m 3 /h。
And determining a preset maximum working flow value and a preset minimum working flow value according to the highest efficiency corresponding working flow under the current frequency of the water pump.
Optionally, in an embodiment of the present application, comparing the current operating flow with a preset working flow, and determining an initial adjustment strategy of the air conditioning water system according to a first comparison result after the comparison, includes:
when the current operation flow of the water pumps is smaller than the preset minimum working flow and the number of the started water pumps is equal to one, keeping the number of the started water pumps and the working frequency unchanged; when the current operation flow of the water pumps is larger than the maximum value of the preset working flow and the number of the started current water pumps is equal to the maximum value of the number of the started preset water pumps, keeping the number of the started current water pumps and the working frequency unchanged; when the current operation flow of the water pump is greater than or equal to the minimum value of the preset working flow and is less than or equal to the maximum value of the preset working flow, keeping the number of the current water pumps started and the working frequency unchanged; and when the current running flow of the water pumps is smaller than the preset minimum working flow and the number of the started water pumps is larger than one, subtracting one from the number of the started water pumps. And when the current running flow of the water pump is greater than the maximum preset working flow and the number of the started current water pumps is less than the maximum preset water pump starting number, adding one to the number of the started current water pumps.
Specifically, the relation between the current operation flow of the water pump and the working flow G' with the highest efficiency under the current frequency is judged. If G is i <0.9 g', but is currently 1 stageAnd (5) maintaining the number N and the frequency f of the currently operated water pumps when the water pumps are operated. If G is i >1.1 g', but the maximum number of water pumps is operated at present, the current number of water pumps N and the frequency f are maintained. If 0.9G'<G i <1.1 g', and also maintaining the number N and the frequency f of the current running water pumps.
Similarly, if G i <0.9G' and the number N of the current parallel water pumps running>And 1, starting the adjustment analysis of the number N and the frequency f of the water pumps, and predicting the feasibility of reducing the operation of one water pump (N = N-1). Likewise if G i >1.1G', and the number of the water pumps which are operated in parallel does not reach the maximum value currently, starting adjustment analysis of the number N and the frequency f of the water pumps, and predicting the feasibility of increasing one water pump operation (N = N + 1).
In step S103, the operation efficiency and the operation resistance coefficient of each water pump in the current operation state and the initial adjustment strategy are compared, an optimal adjustment strategy for the air-conditioning water system is generated according to the second comparison result after comparison, and the air-conditioning water pump system is controlled to operate according to the optimal adjustment strategy.
Optionally, in an embodiment of the present application, comparing the operating efficiency and the operating resistance coefficient of each water pump in the current operating state and in the initial adjustment strategy, and generating an optimal adjustment strategy for the air conditioning water system according to a second comparison result after the comparison, includes:
respectively calculating the equivalent resistance coefficient and the water pump operating efficiency of each water pump after increasing and decreasing one water pump, as shown in formula (7) and formula (8):
S i ＝N 2 *S (7)
wherein S is i Equivalent resistance coefficients for each running water pump; eta 'of' i Predicting the operating efficiency of the water pump after adjustment; d. e and p are fitting coefficients;
when the operation efficiency of the water pump after one water pump is increased or decreased is less than or equal to the operation efficiency of the water pump in the current operation state, keeping the number of the started water pumps and the working frequency unchanged;
if the adjusted water pump operation efficiency eta 'is obtained through prediction' i Higher than the current water pump operation efficiency eta i Then further calculating the flow G of each water pump after adjustment i As shown in formula (9):
G i ＝G t /N (9)
when the operation efficiency of the water pump after one water pump is increased or reduced is higher than that of the water pump in the current operation state, calculating the flow of each water pump after one water pump is increased or reduced, and calculating the corresponding rated flow of the current water pump equivalent resistance coefficient according to a water pump lift-flow curve formula and a calculation formula of the water pump equivalent resistance coefficient, wherein the formula (10) and the formula (11) are shown as follows:
wherein H 0 Corresponding to the current equivalent resistance coefficient of the water pump with rated lift; g i,0 Corresponding to the current equivalent resistance coefficient of the water pump with rated flow; s i Equivalent resistance coefficient of each running water pump; a. b and c are fitting coefficients;
according to the flow G of each water pump after increasing or decreasing one water pump i Rated flow G corresponding to current water pump equivalent resistance coefficient i,0 Calculating the water pump frequency f after adding or reducing one water pump, as shown in equation (12):
f＝G i /G i,0 (12)
judging whether the frequency f of the water pump after increasing or decreasing one water pump is in a preset frequency range, if not, keeping the number of the started water pumps and the working frequency unchanged; and if so, adjusting the air-conditioning water system according to the initial adjustment strategy to generate an optimal adjustment strategy of the air-conditioning water system.
It can be understood that the embodiment of the application calculates the operation flow of the opening water pump and the operation lift of the opening water pump by monitoring the operation flow of the water supply pipe and the pressure of the water supply return pipe, and simultaneously calculates the equivalent resistance coefficient of each water pump. When the water pumps are operated in parallel, the pressure of the water outlet of each water pump is influenced by the operating pressure of other water pumps, so that the corresponding equivalent resistance coefficient of each water pump is increased, namely the actual working point of each water pump is deviated to the left. Therefore, for the water pumps with right-biased working points, the working points of each water pump are biased to the left by increasing the number of the running water pumps, and then the water pumps return to the high-efficiency area. And for the water pumps with the working points deviated to the left, the working points of each running water pump are deviated to the right by reducing the number of the water pumps which are started, and the running water pumps return to the high-efficiency area. Meanwhile, the prediction of the operation efficiency of the adjusted water pump is combined, so that the operation regulation and control of the water pump can be better guided.
The following describes a method for controlling parallel operation of water pumps of an air conditioning water system according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of the execution logic of a control method for parallel operation of water pumps of an air conditioning water system. As shown in fig. 3, the specific control steps include:
the method comprises the following steps of firstly, fitting a relation of a water pump operation lift-flow and efficiency-flow performance curve according to a water pump sample performance curve, and determining a fitting coefficient:
H＝a*G 2 +b*G+c
η＝d*G 2 +e*G+p
wherein H is the pump lift in mH 2 O; g is the running flow of the water pump in m 3 H; eta is the operating efficiency of the water pump and is a dimensionless parameter; a. b, c, d, e and p are fitting coefficients.
Step two, monitoring the number N of the water pumps which are started, the operating frequency f (unit Hz) and the flow G of the water supply pipe t (unit m) 3 H), pump head H (unit mH) 2 O), water pump operating power W i (unit kW) and the like, and feeding back the operation parameters to the control box.
Step three, calculating the operation flow and the operation efficiency of each water pump and the current water system operation resistance coefficient S:
G i ＝G t /N
η i ＝H*G i /W i
S＝H/G t 2
wherein G is i The flow of each water pump is uniformly distributed according to the parallel operation of the water pumps, and the flow of the main pipe is G t Dividing by the number of operating stations N to obtain the unit m 3 /h；η i The operation efficiency of each water pump is free of dimensional parameters; s is the running resistance coefficient of the front water system, unit mH 2 O*h 2 /m 6 ；
Step four, calculating the corresponding flow of the rated working point of the water pump under the current frequency:
wherein G' is the corresponding flow rate of the rated working point of the water pump under the current frequency and the unit m 3 H; f is the current running frequency of the water pump in Hz; g 0 The rated working flow of the water pump, namely the working flow corresponding to the highest efficiency point, is the unit m 3 /h。
And fifthly, judging the relation between the current operation flow of the water pump and the working flow G' with the highest efficiency under the current frequency. If G is i <0.9 g', but 1 water pump is operated at present, the number N and the frequency f of the currently operated water pumps are maintained. If G is i >1.1 g', but the maximum number of water pumps is operated at present, the current number of water pumps N and the frequency f are maintained. If 0.9G'<G i <1.1 g', and also maintaining the number N and the frequency f of the current running water pumps.
And step six, judging the relation between the current operation flow of the water pump and the working flow G' corresponding to the highest efficiency under the current frequency. If G is i <0.9G' and the number N of the current parallel water pumps running>And 1, starting the adjustment analysis of the number N and the frequency f of the water pumps, and predicting the feasibility of reducing the operation of one water pump (N = N-1). Likewise if G i >1.1G' and the number of the running water pumps which are difficult to run in parallel connection does not reach the maximum value, the number N and the frequency f of the water pumps are startedThe analysis was adjusted to predict the feasibility of adding one pump run (N = N + 1).
Step seven, after one water pump operation is reduced (N = N-1) or one water pump operation is increased (N = N + 1) in prediction, calculating the equivalent resistance coefficient S of each water pump i And predicting the adjusted water pump operation efficiency eta' i ：
S i ＝N 2 *S
Wherein S i For each running water pump equivalent resistance coefficient, unit mH 2 O*h 2 /m 6 ；η′ i The predicted value of the operation efficiency of the water pump after adjustment is a dimensionless parameter; d. and e and p are coefficients obtained by fitting according to a water pump performance curve.
Step eight, if the adjusted water pump operation efficiency eta 'is obtained through prediction' i Is lower than the current water pump operation efficiency eta i And maintaining the number N and the frequency f of the current running water pumps.
Step nine, if the adjusted water pump operation efficiency eta 'is obtained through prediction' i Higher than the current water pump operation efficiency eta i Then further calculating the flow G of each water pump after adjustment i ：
G i ＝G t /N
Step ten, combining a pump lift-flow curve formula and a water pump equivalent resistance coefficient formula, and calculating the corresponding rated flow G of the current water pump equivalent resistance coefficient i,0 ：
Wherein H 0 Corresponding to the rated lift for the current equivalent resistance coefficient of the water pump in the unit mH 2 O；G i,0 Corresponding to the rated flow for the equivalent resistance coefficient of the current water pump, the unit is m3/h; s i For each running water pump equivalent resistance coefficient, unit mH 2 O*h 2 /m 6 (ii) a a. And b and c are coefficients obtained by fitting according to a water pump performance curve.
Eleven, according to the flow G of each water pump after adjustment i Rated flow G corresponding to current water pump equivalent resistance coefficient i,0 Calculating the adjusted water pump frequency f:
f＝G i /G i,0
and step twelve, judging whether the adjusted water pump frequency is between 20Hz and 50Hz, and if the adjusted water pump frequency exceeds the range, maintaining the number N and the frequency f of the currently operated water pumps. And if the frequency is within the range, outputting the adjusted number N and frequency f of the water pumps.
According to the method for controlling the parallel operation of the water pumps of the air-conditioning water system, the real-time operation state and the operation efficiency of the water pumps are determined by monitoring the actual operation parameters of the air-conditioning cold water system, the flow of the cooling water system header pipe, the water pressure before and after the water pumps, the number of the water pumps in operation, the operation frequency, the operation power and the like in real time and combining a water pump lift-flow performance curve and an efficiency-flow performance curve, the number of the water pumps and the overall operation efficiency after frequency adjustment are predicted and evaluated through the provided control logic, and the function of optimally setting the number of the water pumps in parallel and the operation frequency is realized. The number and the frequency of the running units of the air conditioner cold water pump and the cooling water pump can be automatically adjusted and optimized according to the actual cooling demand under different running working conditions in the cooling season, so that the high-efficiency running can be maintained for a long time, and the running energy consumption of the air conditioner water system can be reduced.
Next, a water pump parallel operation control device of an air conditioning water system according to an embodiment of the present application will be described with reference to the accompanying drawings.
Fig. 4 is a block diagram schematically illustrating a parallel operation control device for water pumps of an air-conditioning water system according to an embodiment of the present invention.
As shown in fig. 4, the water pump parallel operation control device 10 of the air-conditioning water system includes: a calculation module 100, an optimization module 200, and a control module 300.
The calculation module 100 is configured to calculate a current operating flow and a current operating efficiency of each water pump and a current operating resistance coefficient of the air-conditioning water system according to a current operating state parameter of the air-conditioning water system, and a head-flow performance curve relationship and an efficiency-flow performance curve relationship of the air-conditioning water system. The optimization module 200 is configured to compare the current operation flow with a preset working flow, and determine an initial adjustment strategy of the air-conditioning water system according to a first comparison result after comparison. The control module 300 is configured to compare the operation efficiency and the operation resistance coefficient of each water pump in the current operation state and the initial adjustment strategy, generate an optimal adjustment strategy for the air-conditioning water system according to a second comparison result after comparison, and control the air-conditioning water pump system to operate according to the optimal adjustment strategy.
Optionally, in an embodiment of the present application, the method further includes:
the first determining module is used for determining the head-flow performance curve relation and the efficiency-flow performance curve relation of an air-conditioning water system:
H＝a*G 2 +b*G+c
η＝d*G 2 +e*G+p
wherein H is the running lift of the water pump; g is the running flow of the water pump; eta is the operating efficiency of the water pump; a. b, c, d, e and p are fitting coefficients.
Optionally, in an embodiment of the present application, the computing module 100 is specifically configured to,
G i ＝G t /N
η i ＝H*G i /W i
S＝H/G t 2
wherein, G i The operation flow of the ith water pump is set; g t Is the main pipe flow; n is the number of the water pumps which are started; eta i The operation efficiency of the ith water pump is obtained; and S is the running resistance coefficient of the air-conditioning water system.
Optionally, in an embodiment of the present application, the method further includes:
the second determining module is used for calculating the highest corresponding working flow G' of the efficiency of the water pump under the current frequency:
wherein f is the operating frequency of the water pump, G 0 The rated working flow of the water pump.
And determining a preset maximum working flow value and a preset minimum working flow value according to the highest efficiency corresponding working flow under the current frequency of the water pump.
Optionally, in an embodiment of the present application, the optimization module 200 is specifically configured to, when the current operation flow of the water pump is smaller than the preset minimum working flow, and the number of the current water pumps started is equal to one, keep the number of the current water pumps started and the working frequency unchanged; when the current operation flow of the water pumps is larger than the maximum value of the preset working flow and the current number of the opened water pumps is equal to the maximum value of the preset number of the opened water pumps, keeping the current number of the opened water pumps and the working frequency unchanged; when the current operation flow of the water pump is greater than or equal to the minimum value of the preset working flow and is less than or equal to the maximum value of the preset working flow, keeping the number of the current water pumps started and the working frequency unchanged; when the current operation flow of the water pumps is smaller than the preset minimum working flow and the number of the started water pumps is larger than one, reducing the number of the started water pumps by one; and when the current running flow of the water pump is greater than the maximum preset working flow and the number of the started current water pumps is less than the maximum preset water pump starting number, adding one to the number of the started current water pumps.
Optionally, in one embodiment of the present application, the control module 300, in particular for,
respectively calculating the equivalent resistance coefficient and the water pump operation efficiency of each water pump after adding and reducing one water pump:
S i ＝N 2 *S
wherein S is i Equivalent resistance coefficient of water pump for each operation；η′ i Predicting the operating efficiency of the water pump after adjustment; d. e and p are fitting coefficients;
when the operation efficiency of the water pump after one water pump is increased or decreased is less than or equal to that of the water pump in the current operation state, keeping the number of the started water pumps and the working frequency unchanged;
when the operation efficiency of the water pump after one water pump is increased or reduced is higher than that of the water pump in the current operation state, calculating the flow of each water pump after one water pump is increased or reduced, and calculating the corresponding rated flow of the current water pump equivalent resistance coefficient according to a water pump lift-flow curve formula and a calculation formula of the water pump equivalent resistance coefficient:
wherein H 0 Corresponding to the current equivalent resistance coefficient of the water pump with the rated lift; g i,0 Corresponding to the current equivalent resistance coefficient of the water pump with rated flow; s. the i Equivalent resistance coefficient of each running water pump; a. b and c are fitting coefficients;
according to the flow G of each water pump after increasing or decreasing one water pump i Rated flow G corresponding to current water pump equivalent resistance coefficient i,0 Calculating the water pump frequency f after adding or reducing one water pump:
f＝G i /G i,0
judging whether the frequency f of the water pump after increasing or decreasing one water pump is in a preset frequency range, if not, keeping the number of the started water pumps and the working frequency unchanged; and if so, adjusting the air-conditioning water system according to the initial adjustment strategy to generate an optimal adjustment strategy of the air-conditioning water system.
It should be noted that the explanation of the embodiment of the water pump parallel operation control method for an air-conditioning water system is also applicable to the water pump parallel operation control device for an air-conditioning water system of the embodiment, and is not repeated herein.
According to the water pump parallel operation control device of the air-conditioning water system, on the basis that hardware equipment such as sensors is not added, the sensors of the air-conditioning water system can be used for monitoring the required operation parameters. Through the functions of automatic monitoring, automatic identification, automatic setting and automatic control, the air-conditioning water pump realizes the real-time and automatic adjustment of the number and the frequency of the water pumps according to the changed cooling demands in different operation conditions of a cooling season, so that the air-conditioning water pump maintains efficient operation for a long time, and the operation energy consumption of the system is reduced.
Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application. The electronic device may include:
a memory 501, a processor 502, and a computer program stored on the memory 501 and executable on the processor 502.
The processor 502 executes the program to implement the water pump parallel operation control method of the air-conditioning water system provided in the above-described embodiment.
Further, the electronic device further includes:
a communication interface 503 for communication between the memory 501 and the processor 502.
A memory 501 for storing computer programs that can be run on the processor 502.
The memory 501 may comprise high-speed RAM memory, and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
If the memory 501, the processor 502 and the communication interface 503 are implemented independently, the communication interface 503, the memory 501 and the processor 502 may be connected to each other through a bus and perform communication with each other. The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 5, but that does not indicate only one bus or one type of bus.
Optionally, in a specific implementation, if the memory 501, the processor 502, and the communication interface 503 are integrated on a chip, the memory 501, the processor 502, and the communication interface 503 may complete communication with each other through an internal interface.
The processor 502 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present Application.
The present embodiment also provides a computer-readable storage medium having stored thereon a computer program characterized in that the program, when executed by a processor, implements the water pump parallel operation control method of an air-conditioned water system as above.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of implementing the embodiments of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are well known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
Claims (8)
1. A parallel operation control method for water pumps of an air-conditioning water system is characterized by comprising the following steps:
calculating the current operation flow and the current operation efficiency of each water pump and the current operation resistance coefficient of the air-conditioning water system according to the current operation state parameters of the air-conditioning water system and the head-flow performance curve relationship and the efficiency-flow performance curve relationship of the air-conditioning water system;
comparing the current operation flow with a preset working flow, and determining an initial adjustment strategy of the air-conditioning water system according to a first comparison result after comparison;
comparing the operating efficiency and the operating resistance coefficient of each water pump in the current operating state and the initial adjustment strategy, generating an optimal adjustment strategy of the air-conditioning water system according to a second comparison result after comparison, and controlling the air-conditioning water system to work according to the optimal adjustment strategy;
before comparing the current operation flow with a preset working flow, the method further comprises:
calculating the highest corresponding working flow G' of the efficiency of the water pump under the current frequency:
wherein f is the operating frequency of the water pump, G 0 Rated working flow rate of the water pump;
determining a preset working flow maximum value and a preset working flow minimum value according to the working flow corresponding to the highest efficiency of the water pump under the current frequency;
the comparing the current operation flow with the preset working flow and determining the initial adjustment strategy of the air-conditioning water system according to the compared first comparison result comprises the following steps:
when the current operation flow of the water pump is smaller than the preset minimum working flow and the number of the started water pumps is equal to one, keeping the number of the started water pumps and the working frequency unchanged;
when the current operation flow of the water pump is larger than the preset maximum working flow and the current number of the opened water pumps is equal to the preset maximum number of the opened water pumps, keeping the current number of the opened water pumps and the working frequency unchanged;
when the current operation flow of the water pump is greater than or equal to the preset working flow minimum value and less than or equal to the preset working flow maximum value, keeping the number of the current water pumps which are started and the working frequency unchanged;
when the current operation flow of the water pumps is smaller than the preset minimum working flow and the number of the current water pumps which are started is larger than one, the number of the current water pumps which are started is reduced by one;
when the current operating flow of the water pump is larger than the preset maximum working flow and the current number of the started water pumps is smaller than the preset maximum number of the started water pumps, adding one to the current number of the started water pumps;
the step of comparing the operating efficiency and the operating resistance coefficient of each water pump in the current operating state and the initial adjustment strategy and generating the optimal adjustment strategy of the air-conditioning water system according to a second comparison result after comparison comprises the following steps:
respectively calculating the equivalent resistance coefficient and the water pump operation efficiency of each water pump after increasing and reducing one water pump:
S i ＝N 2 *S
wherein S is i Equivalent resistance coefficients for each running water pump; n is the number of the water pumps which are started; s is the running resistance coefficient of the air-conditioning water system; eta 'of' i Predicting the operation efficiency of the water pump after adjustment; d. e and p are fitting coefficients; h is the running lift of the water pump;
when the operation efficiency of the water pump after one water pump is increased or decreased is less than or equal to the operation efficiency of the water pump in the current operation state, keeping the number of the started water pumps and the working frequency unchanged;
when the operation efficiency of the water pump after one water pump is increased or reduced is higher than that of the water pump in the current operation state, calculating the flow of each water pump after one water pump is increased or reduced, and calculating the corresponding rated flow of the current water pump equivalent resistance coefficient according to a water pump lift-flow curve formula and a calculation formula of the water pump equivalent resistance coefficient:
wherein H 0 Corresponding to the current equivalent resistance coefficient of the water pump with the rated lift; g i,0 Corresponding to the current equivalent resistance coefficient of the water pump with rated flow; s i Equivalent resistance coefficients for each running water pump; a. b and c are fitting coefficients;
according to the flow G of each water pump after increasing or decreasing one water pump i Rated flow G corresponding to current water pump equivalent resistance coefficient i,0 Calculating the water pump frequency f after adding or reducing one water pump:
f＝G i /G i,0
judging whether the frequency f of the water pump after increasing or decreasing one water pump is in a preset frequency range, if not, keeping the number of the started water pumps and the working frequency unchanged; and if so, adjusting the air-conditioning water system according to the initial adjustment strategy to generate an optimal adjustment strategy of the air-conditioning water system.
2. The method of claim 1, wherein before calculating the current operating flow and the current operating efficiency of each water pump and the current operating resistance coefficient of the air-conditioning water system, further comprising:
determining the performance curve relationship of the head-flow and the performance curve relationship of the efficiency-flow of the air-conditioning water system:
H＝a*G 2 +b*G+c
η＝d*G 2 +e*G+p
wherein H is the running lift of the water pump; g is the running flow of the water pump; eta is the operating efficiency of the water pump; a. b, c, d, e and p are fitting coefficients.
3. The method of claim 1, wherein calculating the current operating flow and current operating efficiency of each water pump and the current operating resistance coefficient of the air-conditioning water system comprises:
G i ＝G t /N
η i ＝H*G i /W i
S＝H/G t 2
wherein, G i The operation flow of the ith water pump is set; g t Is the main pipe flow; n is the number of the water pumps which are started; eta i The operation efficiency of the ith water pump is calculated; h is the running lift of the water pump; w i The running power of the water pump is set; and S is the running resistance coefficient of the air-conditioning water system.
4. The utility model provides an air conditioner water system's water pump parallel operation controlling means which characterized in that includes:
the calculation module is used for calculating the current operation flow and the current operation efficiency of each water pump and the current operation resistance coefficient of the air-conditioning water system according to the current operation state parameters of the air-conditioning water system and the head-flow performance curve relation and the efficiency-flow performance curve relation of the air-conditioning water system;
the optimization module is used for comparing the current operation flow with a preset working flow and determining an initial adjustment strategy of the air-conditioning water system according to a compared first comparison result;
the control module is used for comparing the operating efficiency and the operating resistance coefficient of each water pump in the current operating state and the initial adjustment strategy, generating an optimal adjustment strategy of the air-conditioning water system according to a second comparison result after comparison, and controlling the air-conditioning water system to work according to the optimal adjustment strategy;
the device further comprises: a second determining module, configured to calculate a working flow G' corresponding to the highest efficiency at the current frequency of the water pump before comparing the current operating flow with a preset working flow:
wherein f is the operating frequency of the water pump, G 0 Rated working flow rate of the water pump;
determining a preset working flow maximum value and a preset working flow minimum value according to the working flow corresponding to the highest efficiency of the water pump under the current frequency;
the optimization module is, in particular, configured to,
when the current operation flow of the water pump is smaller than the preset minimum working flow and the number of the started water pumps is equal to one, keeping the number of the started water pumps and the working frequency unchanged;
when the current operation flow of the water pump is larger than the preset maximum working flow and the current number of the opened water pumps is equal to the preset maximum number of the opened water pumps, keeping the current number of the opened water pumps and the working frequency unchanged;
when the current operation flow of the water pump is greater than or equal to the preset working flow minimum value and less than or equal to the preset working flow maximum value, keeping the number of the current water pumps which are started and the working frequency unchanged;
when the current operation flow of the water pumps is smaller than the preset minimum working flow and the number of the started water pumps is larger than one, reducing the number of the started water pumps by one;
when the current operating flow of the water pump is larger than the preset maximum working flow and the number of the started water pumps is smaller than the preset maximum number of the started water pumps, adding one to the number of the started water pumps;
the control module is specifically configured to, in response to the input signal,
respectively calculating the equivalent resistance coefficient and the water pump operation efficiency of each water pump after adding and reducing one water pump:
S i ＝N 2 *S
wherein S is i Equivalent resistance of water pump for each operationA coefficient; n is the number of the water pumps started; s is the running resistance coefficient of the air-conditioning water system; eta 'of' i Predicting the operation efficiency of the water pump after adjustment; d. e and p are fitting coefficients; h is the running lift of the water pump;
when the operation efficiency of the water pump after one water pump is increased or decreased is less than or equal to the operation efficiency of the water pump in the current operation state, keeping the number of the started water pumps and the working frequency unchanged;
when the operation efficiency of the water pump after one water pump is increased or reduced is higher than that of the water pump in the current operation state, calculating the flow of each water pump after one water pump is increased or reduced, and calculating the corresponding rated flow of the current water pump equivalent resistance coefficient according to a water pump lift-flow curve formula and a calculation formula of the water pump equivalent resistance coefficient:
wherein H 0 Corresponding to the current equivalent resistance coefficient of the water pump with the rated lift; g i,0 Corresponding to the current equivalent resistance coefficient of the water pump with rated flow; s. the i Equivalent resistance coefficients for each running water pump; a. b and c are fitting coefficients;
according to the flow G of each water pump after increasing or decreasing one water pump i Rated flow G corresponding to current water pump equivalent resistance coefficient i,0 Calculating the water pump frequency f after adding or reducing one water pump:
f＝G i /G i,0
judging whether the frequency f of the water pump after increasing or decreasing one water pump is in a preset frequency range, if not, keeping the number of the started water pumps and the working frequency unchanged; and if so, adjusting the air-conditioning water system according to the initial adjustment strategy to generate an optimal adjustment strategy of the air-conditioning water system.
5. The apparatus of claim 4, further comprising:
the first determination module is used for determining the head-flow performance curve relation and the efficiency-flow performance curve relation of the air-conditioning water system:
H＝a*G 2 +b*G+c
η＝d*G 2 +e*G+p
wherein H is the running lift of the water pump; g is the running flow of the water pump; eta is the operating efficiency of the water pump; a. b, c, d, e and p are fitting coefficients.
6. The apparatus according to claim 4, characterized in that the computing module is, in particular,
G i ＝G t /N
η i ＝H*G i /W i
S＝H/G t 2
wherein, G i The operation flow of the ith water pump is set; g t Is the main pipe flow; n is the number of the water pumps started; eta i The operation efficiency of the ith water pump is calculated; w i The running power of the water pump is set; and S is the running resistance coefficient of the air-conditioning water system.
7. An electronic device, comprising: a memory, a processor and a computer program stored on the memory and operable on the processor, the processor executing the program to implement the water pump parallel operation control method of an air conditioning water system according to any one of claims 1 to 3.
8. A computer-readable storage medium having stored thereon a computer program, wherein the program is executed by a processor for implementing the parallel operation control method of water pumps of an air-conditioning water system as claimed in any one of claims 1 to 3.
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| CN115597189B (en) * | 2022-11-04 | 2024-05-10 | 江苏橙智云信息技术有限公司 | Cloud-based chilled water pump energy-saving strategy simulation method and system |
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