CN110953685A - Hydraulic simulation calculation method, storage device and processor of general air conditioning system - Google Patents
Hydraulic simulation calculation method, storage device and processor of general air conditioning system Download PDFInfo
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- CN110953685A CN110953685A CN201911339849.0A CN201911339849A CN110953685A CN 110953685 A CN110953685 A CN 110953685A CN 201911339849 A CN201911339849 A CN 201911339849A CN 110953685 A CN110953685 A CN 110953685A
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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
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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
- 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
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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Abstract
The invention discloses a general hydraulic simulation calculation method of an air conditioning system, a storage device and a processor. The hydraulic simulation calculation method of the air conditioning system comprises the following steps: acquiring design parameters of an air conditioning system; calculating according to the design parameters to obtain a first hydraulic calculation model for representing the corresponding relation between the lift of the refrigeration pump and the flow and the frequency, a second hydraulic calculation model for representing the relation between the pressure drop of the refrigerator and the flow, and a third hydraulic calculation model for representing the relation between the total pressure drop of the refrigeration pipeline and the flow; and if the current chilled water flow of the air-conditioning system is assumed, verifying the first hydraulic calculation model, the second hydraulic calculation model, the third hydraulic calculation model and the fourth hydraulic calculation model according to the current operation parameters of the air-conditioning system, and if the first hydraulic calculation model, the third hydraulic calculation model and the fourth hydraulic calculation model are not verified, repeating the steps for iterative calculation until the verification is passed. The method can be suitable for hydraulic simulation calculation of various central air-conditioning systems with different design schemes, and all hydraulic operation parameters of each key node of the air-conditioning system can be obtained.
Description
Technical Field
The invention relates to an air conditioning system simulation technology, in particular to a general hydraulic simulation calculation method of an air conditioning system.
Background
With the increasingly prominent energy problem in China, energy conservation and emission reduction are highly valued by governments. The simulation technology of the central air conditioner in the design process is a key technology in the energy-saving control technology of the central air conditioner, the cold station water pipeline system is an important component of the central air conditioner system, and the key point in the simulation technology of the central air conditioner system is to establish a simulation algorithm of the cold station water pipeline of the central air conditioner system.
The hydraulic calculation method in the dynamic simulation technology of the central air-conditioning system is different from the hydraulic calculation method in the traditional central air-conditioning design calculation, the hydraulic calculation method related in the traditional central air-conditioning system design scheme is that the pressure drop of each pipe section under the design flow is respectively calculated according to the specific design parameters such as the length, the pipe diameter and the roughness of each different pipe section of the worst loop, the design lift of a water pump (namely a refrigerating pump) is determined according to the design margin coefficient, and the type selection of the water pump (namely the refrigerating pump) is carried out according to the sample data of the factory of the water pump (namely the refrigerating pump). The hydraulic calculation method cannot solve the hydraulic calculation problem in the dynamic simulation technology of the central air conditioner.
Therefore, it is necessary to provide a general hydraulic calculation method applicable to the dynamic simulation technology of the central air conditioner, so that the hydraulic calculation method is applicable to all different central air conditioning systems, including water systems with different lengths, diameters, various valves and pipes on the pipes, and how to solve the problem is a technical problem to be solved in the industry.
Disclosure of Invention
In order to solve the technical problem of the general hydraulic power calculation method applicable to the dynamic simulation technology of the central air conditioner in the prior art, the invention provides a general hydraulic power simulation calculation method of an air conditioning system, a storage device and a processor.
The hydraulic simulation calculation method of the air conditioning system provided by the invention comprises the following steps:
step 1, obtaining design parameters of an air conditioning system;
step 2, calculating according to the design parameters to obtain a first hydraulic calculation model for representing the corresponding relation between the lift and the flow rate of the refrigerating pump and the frequency, a second hydraulic calculation model for representing the relation between the pressure drop and the flow rate of the refrigerating machine and a third hydraulic calculation model for representing the relation between the total pressure drop and the flow rate of the refrigerating pipeline;
and 3, assuming the current chilled water flow of the air-conditioning system, verifying the first hydraulic calculation model, the second hydraulic calculation model and the third hydraulic calculation model according to the current operation parameters of the air-conditioning system, and if the first hydraulic calculation model, the second hydraulic calculation model and the third hydraulic calculation model are not verified, repeating the steps 1 to 3 to perform iterative calculation until the verification is passed.
Further, the design parameters include: the design method comprises the following steps of designing a relation curve of the lift and the flow of a freezing pump, a relation curve of the frequency and the flow of the freezing pump, the design pressure drop of a cold machine, the design flow of a freezing pipe, the total pressure drop of a freezing pipeline under the design working condition, the design pressure drop of the cold machine, the total number of the cold machines, the design lift of the freezing pump and the design value of the pressure difference at two ends of a bypass valve of a freezing main pipe.
Further, the step of calculating according to the design parameters to obtain a first hydraulic calculation model representing the corresponding relation between the lift, the flow and the frequency of the refrigeration pump specifically comprises the following steps: and calculating to obtain the first hydraulic calculation model of any flow and the corresponding relation between any frequency and the lift according to the relation curve between the lift and the flow of the refrigerating pump and the relation curve between the frequency and the flow of the refrigerating pump in the design parameters.
Further, the step of calculating a second hydraulic calculation model representing the relation between the pressure drop and the flow rate of the cooler according to the design parameters specifically comprises the following steps:
obtaining the design pressure drop of the refrigerator and the design flow of the refrigerating pipe in the design parameters;
calculating to obtain the resistance coefficient of the refrigerator according to the design pressure drop and the design flow of the freezing pipe;
and constructing a second hydraulic calculation model representing the relation between the pressure drop and the flow of the cooler according to the resistance coefficient of the cooler.
Further, the third hydraulic calculation model for representing the relation between the total pressure drop and the flow rate of the freezing pipeline according to the design parameters includes:
calculating to obtain the total pressure drop of the freezing pipeline under the design working condition according to the design parameters;
and calculating to obtain a resistance coefficient of the freezing pipeline according to the total pressure drop of the freezing pipeline and the design flow of the freezing pipe under the design working condition, and constructing a third hydraulic calculation model representing the relation between the total pressure drop and the flow of the freezing pipeline according to the resistance coefficient of the freezing pipeline.
Further, the calculating of the total pressure drop of the freezing pipeline under the design working condition according to the design parameters specifically includes:
obtaining the design pressure drop of the refrigerator and the total number of the refrigerators in the design parameters, and calculating to obtain the total pressure drop of the refrigerator;
and obtaining the design lift of the freezing pump, the design value of the pressure difference at two ends of the bypass valve of the freezing main pipe and the total pressure drop of the refrigerator in the design parameters, and calculating to obtain the total pressure drop of the freezing pipeline under the design working condition.
Further, the verifying the first to third hydraulic calculation models specifically includes:
calculating to obtain the total head of all refrigeration pumps of the air conditioning system which is started currently, the total pressure drop of all refrigerators which are started currently and the total pressure drop of a refrigeration pipeline according to the current chilled water flow and/or the current operating parameters of the air conditioning system and the first to third hydraulic calculation models;
subtracting the total pressure drop of all the refrigerating machines which are started at present and the total pressure drop of the refrigerating pipeline at present from the total head of all the refrigerating pumps which are started at present to obtain the pressure difference at two ends of the bypass valve of the refrigerating main pipe;
comparing the pressure difference at the two ends of the bypass valve of the freezing main pipe with a preset value corresponding to the flow of the freezing water; if the obtained difference is less than or equal to the set threshold, the verification is passed; otherwise, the verification fails.
Further, obtaining the total head of all the refrigeration pumps of the air conditioning system which is currently started specifically includes:
acquiring the current frequency of the freezing pumps and the number of the started freezing pumps in the operation parameters of the air-conditioning system;
inputting the frequency of the current freezing pump and the assumed flow of the freezing water into the first calculation model to calculate to obtain the head of a single freezing pump;
and calculating the total head of all the currently started refrigerating pumps according to the number of the currently started refrigerating pumps.
Further, obtaining the total pressure drop of all the chillers currently started up of the air conditioning system specifically includes:
acquiring the number of the current started coolers in the operation parameters of the air-conditioning system;
inputting the assumed chilled water flow into a second calculation model to calculate to obtain the pressure drop of the single cooler;
and calculating to obtain the total pressure drop of all the currently started coolers according to the number of the currently started coolers.
Further, obtaining the total pressure drop of the refrigeration pipeline of the air conditioning system specifically comprises: and inputting the assumed chilled water flow into a third hydraulic calculation model to calculate the current total pressure drop of the freezing pipeline.
The storage device provided by the invention is used for storing a computer program, and the computer program is used for executing the hydraulic simulation calculation method in the technical scheme.
The processor provided by the invention is used for running a computer program, and the computer program executes the hydraulic simulation calculation method in the technical scheme when running.
The hydraulic calculation model of the air conditioning system is divided into three parts, the calculation models of the parts are respectively constructed by using design parameters, and finally, the difference between the pressure difference at the two ends of the bypass valve of the freezing main pipe and a preset value is compared to verify, and iterative operation is repeatedly performed, so that the hydraulic calculation model of the universal air conditioning system is obtained.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a hardware diagram of the present invention.
FIG. 2 is a simulation flow chart of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
Fig. 1 shows a simplified layout of freezing side water pipelines of a cold station of a central air-conditioning system, the main components of the cold station include n cold machines connected in parallel, n freezing pumps (i.e. water pumps) connected in parallel, and freezing pipelines connecting the cold station, the freezing pumps, a water collector and a water distributor, a freezing main pipe bypass valve (not shown in the figure) is arranged on the freezing pipeline between the water collector and the water distributor, wherein the number of the cold machines and the number of the freezing pumps can be the same or different.
The general hydraulic calculation method of the central air-conditioning system provided by the invention needs to know the detailed design scheme of the central air-conditioning system, which comprises the design parameters and all-condition performance curves of various air-conditioning equipment, namely the performance curves under all-condition of the air-conditioning equipment, such as a cold machine, a water pump, a cooling tower fan, an electric valve, a water pipe network, a plate exchanger and the like, for example: the design method comprises the following steps of designing a relation curve of the lift and the flow of a freezing pump, a relation curve of the frequency and the flow of the freezing pump, the design pressure drop of a cold machine, the design flow of a freezing pipe, the total pressure drop of a freezing pipeline under the design working condition, the design pressure drop of the cold machine, the total number of the cold machines, the design lift of the freezing pump, the design value of the pressure difference between two ends of a bypass valve of a freezing main pipe and the like.
According to the design parameters of the air conditioning system, a first hydraulic calculation model for representing the corresponding relation between the lift and the flow rate of the refrigerating pump and the frequency, a second hydraulic calculation model for representing the relation between the pressure drop and the flow rate of the refrigerating machine and a third hydraulic calculation model for representing the relation between the total pressure drop and the flow rate of the refrigerating pipeline are obtained through calculation. And then, assuming the current chilled water flow of the air conditioning system, verifying and iteratively calculating the first hydraulic calculation model, the second hydraulic calculation model and the third hydraulic calculation model according to the current operating parameters of the air conditioning system until the verification is passed.
The main theoretical supports for the three computational models of the present invention are described in detail below.
When the size and shape of the cross section of the fluid flow are not changed, the relationship between the pressure drop and the flow of the air conditioning equipment and the pipeline can be calculated according to the following formula:
In the formula (I), the compound is shown in the specification,
the pressure drop (Pa) of air-conditioning equipment (a refrigerator and a freezing pump) and a freezing pipeline; s is the resistance coefficient (kg/m) of air conditioning equipment and refrigeration pipeline7）;Q1Flow (m) for air conditioning equipment and refrigeration lines3/s）。
The relationship between the resistance of each component of the water system pipe network and the lift of the refrigeration pump (the arrangement diagram is shown in figure 1):
Wherein H is the actual head (m) of the refrigerating pump;
for air-conditioning apparatusAnd a pressure drop (Pa) of the refrigeration circuit;
the terminal resistance is the pressure difference (Pa) between the water separator and the water collector.
Relationship of chiller flow to flow in the freezing line (i.e., water line):
In the formula, Q1Is the flow rate (m) of water pipeline3/s）；Q2Is the flow (m) of a single cooler3S); and n is the number of cold machines.
Fig. 2 is a detailed flow chart of the simulation calculation method of the present invention, which starts the hydraulic simulation calculation of the cold station according to the design parameters of the system and the equipment under various design conditions in the design scheme of the air conditioning system. When hydraulic simulation calculation is started, design parameters of the air conditioning system, such as a header pipe design flow (design flow of a freezing pipeline), a relation curve of a head of the freezing pump and the flow, a relation curve of a frequency of the freezing pump and the flow, a design pressure drop of a refrigerator, a design flow of a freezing pipe, a total pressure drop of a freezing pipeline under a design working condition, a design pressure drop of the refrigerator, the total number of refrigerators, a design head of the freezing pump, a design value of a pressure difference between two ends of a bypass valve of the freezing header pipe, and the like, are extracted from a design side of the cold station.
According to the relationship curve of the lift and the flow of the freezing pump and the relationship curve of the frequency and the flow of the freezing pump in design parameters, a large number of sampling values can be obtained through methods such as a sampling method, and a first hydraulic calculation model with any flow and any frequency and lift corresponding relation is constructed and calculated.
According to the design pressure drop of the refrigerator and the design flow of the refrigerating pipe in the design parameters, the resistance coefficient of the refrigerator can be calculated according to the design pressure drop and the design flow of the refrigerating pipe, and the resistance coefficient of the refrigerator is the same under the design working condition or in the simulation process. And constructing a second hydraulic calculation model representing the relation between the pressure drop and the flow of the cooler through the resistance coefficient obtained by calculation.
The resistance coefficient of the freezing pipeline of the refrigerating station is calculated according to the design parameters of the system and the equipment under the design working condition, and the resistance coefficient S of the freezing pipeline is the same under the design working condition and the simulation flow, so that the resistance coefficient of the freezing pipeline is calculated according to the design parameters under the design working condition, and the relation between the pressure drop and the flow of the freezing pipeline during simulation is obtained (namely, a third calculation model). And calculating the total pressure drop of all parallel connection coolers under the design working condition, wherein the total pressure drop can be obtained by calculating the pressure drop of a single cooler through a second hydraulic calculation model and then adding the pressure drops of all coolers, and the total pressure drop of the parallel connection coolers can be obtained by adding the design pressure drops of all parallel connection coolers in the obtained design parameters. And then, calculating to obtain the total pressure drop of the freezing pipeline = the design head of the freezing pump-the total pressure drop of the parallel connection refrigerator-the design value of the pressure difference of the freezing pipeline by obtaining the design value of the pressure difference of the freezing pipeline under the design working condition, and then calculating to obtain the resistance coefficient of the freezing pipeline = the total pressure drop of the freezing pipeline of the cold station/the design flow of the freezing pipe. Thus, a third calculation model can be obtained for calculating the total pressure drop in the freezing line, total pressure drop in the freezing line = freezing water flow2Coefficient of resistance of the refrigeration circuit.
The three computational models are then validated.
And taking the assumed chilled water flow and/or the current operating parameters of the air-conditioning system as the input of a calculation model, and calculating to obtain the total head of all the refrigerating pumps of the currently started air-conditioning system, the total pressure drop of all the refrigerators of the currently started air-conditioning system and the total pressure drop of the refrigerating pipelines through the first hydraulic calculation model to the third hydraulic calculation model.
The method comprises the steps of inputting the current frequency of the freezing pumps and the assumed flow of chilled water into a first calculation model to calculate the lift of a single freezing pump by obtaining the current frequency of the freezing pumps and the number of the started freezing pumps (given by a cold station group control controller) in the operation parameters of the air conditioning system, and calculating the total lift of all the started freezing pumps according to the number of the currently started freezing pumps.
And inputting the assumed chilled water flow into a second calculation model to calculate to obtain the pressure drop of a single cold machine by acquiring the number of the currently started cold machines (given by a cold station group control controller) in the operating parameters of the air conditioning system, and calculating to obtain the total pressure drop of all the currently started cold machines according to the number of the currently started cold machines.
The current total pressure drop of the freezing pipeline is calculated by inputting the assumed flow of the chilled water into the third hydraulic calculation model.
Then, subtracting the total pressure drop of all the refrigerating machines which are started at present and the total pressure drop of the freezing pipelines from the total head of all the freezing pumps which are started at present to obtain the pressure difference at two ends of a main freezing pipe bypass valve, comparing the pressure difference at two ends of the main freezing pipe bypass valve with a preset value corresponding to the flow of the freezing water, and if the obtained difference value is less than or equal to a set threshold value, passing the verification; otherwise, the verification fails, and the three hydraulic models need to be iteratively corrected until the verification is passed. The set threshold value can be set manually to control the precision of simulation calculation.
On the premise that the design scheme of the air-conditioning system is known, the invention needs detailed design scheme and various design parameters of the central air-conditioning system, including a pump head and a pump full-working-condition performance curve (including pump head curves and power curve efficiency curves at different flow rates and frequencies) under the design working condition of the water pump under the design flow rate, a water side pressure drop curve and a pressure drop curve of an evaporator and a condenser under the design flow rate of a cold machine, a dynamic regulating valve opening and pressure drop and a valve regulating characteristic curve under the design flow rate. According to the known conditions, all hydraulic operating parameters of the central air-conditioning system at different flow rates on each key node of a pipeline of the central air-conditioning system can be calculated through the universal hydraulic calculation algorithm, wherein the hydraulic operating parameters comprise hydraulic operating parameters of each actual working condition point of all air-conditioning equipment in the dynamic simulation process, such as the pressure difference at two ends of a bypass valve of a freezing main pipe, the actual lift of a water pump at a certain flow rate and frequency, the pressure drop of a water side of a cold machine evaporator and a condenser at a certain actual flow rate, and the like, so that the hydraulic calculation problem in the dynamic simulation technology of the central air-conditioning system is solved.
In addition to the simulation calculation method, the present invention also protects a storage device for storing a computer program and a processor for running the computer program, which are used to execute the hydraulic simulation calculation method of the present invention when running.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (12)
1. A hydraulic simulation calculation method of an air conditioning system is characterized by comprising the following steps:
step 1, obtaining design parameters of an air conditioning system;
step 2, calculating according to the design parameters to obtain a first hydraulic calculation model for representing the corresponding relation between the lift and the flow rate of the refrigerating pump and the frequency, a second hydraulic calculation model for representing the relation between the pressure drop and the flow rate of the refrigerating machine and a third hydraulic calculation model for representing the relation between the total pressure drop and the flow rate of the refrigerating pipeline;
and 3, assuming the current chilled water flow of the air-conditioning system, verifying the first hydraulic calculation model, the second hydraulic calculation model and the third hydraulic calculation model according to the current operation parameters of the air-conditioning system, and if the first hydraulic calculation model, the second hydraulic calculation model and the third hydraulic calculation model are not verified, repeating the steps 1 to 3 to perform iterative calculation until the verification is passed.
2. The hydraulic simulation calculation method of claim 1, wherein the design parameters include: the design method comprises the following steps of designing a relation curve of the lift and the flow of a freezing pump, a relation curve of the frequency and the flow of the freezing pump, the design pressure drop of a cold machine, the design flow of a freezing pipe, the total pressure drop of a freezing pipeline under the design working condition, the design pressure drop of the cold machine, the total number of the cold machines, the design lift of the freezing pump and the design value of the pressure difference at two ends of a bypass valve of a freezing main pipe.
3. The hydraulic simulation calculation method according to claim 2, wherein the calculating of the first hydraulic calculation model representing the correspondence between the head of the freeze pump and the flow rate and the frequency according to the design parameters specifically includes: and calculating to obtain the first hydraulic calculation model of any flow and the corresponding relation between any frequency and the lift according to the relation curve between the lift and the flow of the refrigerating pump and the relation curve between the frequency and the flow of the refrigerating pump in the design parameters.
4. The hydraulic simulation calculation method according to claim 2, wherein the calculating of the second hydraulic calculation model representing the relationship between the pressure drop and the flow rate of the chiller according to the design parameters specifically includes:
obtaining the design pressure drop of the refrigerator and the design flow of the refrigerating pipe in the design parameters;
calculating to obtain the resistance coefficient of the refrigerator according to the design pressure drop and the design flow of the freezing pipe;
and constructing a second hydraulic calculation model representing the relation between the pressure drop and the flow of the cooler according to the resistance coefficient of the cooler.
5. The hydraulic simulation calculation method according to claim 2, wherein the calculating a third hydraulic calculation model representing a relationship between a total pressure drop and a flow rate of the freezing pipeline according to the design parameters specifically includes:
calculating to obtain the total pressure drop of the freezing pipeline under the design working condition according to the design parameters;
and calculating to obtain a resistance coefficient of the freezing pipeline according to the total pressure drop of the freezing pipeline and the design flow of the freezing pipe under the design working condition, and constructing a third hydraulic calculation model representing the relation between the total pressure drop and the flow of the freezing pipeline according to the resistance coefficient of the freezing pipeline.
6. The hydraulic simulation calculation method according to claim 5, wherein the calculating of the total pressure drop of the freezing pipeline under the design condition according to the design parameters specifically comprises:
obtaining the design pressure drop of the refrigerator and the total number of the refrigerators in the design parameters, and calculating to obtain the total pressure drop of the refrigerator;
and obtaining the design lift of the freezing pump, the design value of the pressure difference at two ends of the bypass valve of the freezing main pipe and the total pressure drop of the refrigerator in the design parameters, and calculating to obtain the total pressure drop of the freezing pipeline under the design working condition.
7. The hydraulic simulation calculation method of claim 1, wherein verifying the first to third hydraulic calculation models specifically comprises:
calculating to obtain the total head of all refrigeration pumps of the air conditioning system which is started currently, the total pressure drop of all refrigerators which are started currently and the total pressure drop of a refrigeration pipeline according to the current chilled water flow and/or the current operating parameters of the air conditioning system and the first to third hydraulic calculation models;
subtracting the total pressure drop of all the refrigerating machines which are started at present and the total pressure drop of the refrigerating pipeline at present from the total head of all the refrigerating pumps which are started at present to obtain the pressure difference at two ends of the bypass valve of the refrigerating main pipe;
comparing the pressure difference at the two ends of the bypass valve of the freezing main pipe with a preset value corresponding to the flow of the freezing water; if the obtained difference is less than or equal to the set threshold, the verification is passed; otherwise, the verification fails.
8. The hydraulic simulation calculation method according to claim 7, wherein the obtaining of the total head of all the refrigeration pumps of the air conditioning system which are currently started comprises:
acquiring the current frequency of the freezing pumps and the number of the started freezing pumps in the operation parameters of the air-conditioning system;
inputting the frequency of the current freezing pump and the assumed flow of the freezing water into the first calculation model to calculate to obtain the head of a single freezing pump;
and calculating the total head of all the currently started refrigerating pumps according to the number of the currently started refrigerating pumps.
9. The hydraulic simulation calculation method according to claim 7, wherein the obtaining of the total pressure drop of all the coolers currently turned on of the air conditioning system specifically comprises:
acquiring the number of the current started coolers in the operation parameters of the air-conditioning system;
inputting the assumed chilled water flow into a second calculation model to calculate to obtain the pressure drop of the single cooler;
and calculating to obtain the total pressure drop of all the currently started coolers according to the number of the currently started coolers.
10. The hydraulic simulation calculation method of claim 7, wherein obtaining the total pressure drop of the refrigeration pipeline of the air conditioning system specifically comprises: and inputting the assumed chilled water flow into a third hydraulic calculation model to calculate the current total pressure drop of the freezing pipeline.
11. A storage device for storing a computer program for executing the hydraulic simulation calculation method according to any one of claims 1 to 10.
12. A processor for running a computer program which when run performs a hydraulic simulation calculation method according to any one of claims 1 to 10.
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| CN104573143A (en) * | 2013-10-12 | 2015-04-29 | 苏州热工研究院有限公司 | Pipe network simulation system and hydraulic calculation method |
| CN105550405A (en) * | 2015-12-07 | 2016-05-04 | 哈尔滨工业大学 | Method for building municipal pipeline hydraulic model |
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| CN106958855A (en) * | 2017-03-31 | 2017-07-18 | 常州英集动力科技有限公司 | The hydraulically balanced model predictive control method of heating system and system |
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| CN112432326A (en) * | 2020-11-19 | 2021-03-02 | 珠海格力电器股份有限公司 | Control method and device of refrigeration secondary pump, air conditioning system, medium and processor |
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