CN113776143A - Energy-saving pipeline combined structure and method for reducing fluid resistance of efficient cold and heat supply system - Google Patents
Energy-saving pipeline combined structure and method for reducing fluid resistance of efficient cold and heat supply system Download PDFInfo
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- CN113776143A CN113776143A CN202111095185.5A CN202111095185A CN113776143A CN 113776143 A CN113776143 A CN 113776143A CN 202111095185 A CN202111095185 A CN 202111095185A CN 113776143 A CN113776143 A CN 113776143A
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0003—Exclusively-fluid systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—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
- F24F11/84—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 valves
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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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- 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
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention relates to an energy-saving pipeline combined structure for reducing fluid resistance of an efficient cooling and heating system and a method thereof. The invention greatly reduces the friction between the refrigeration medium and the conveying pipeline during conveying and refluxing, thereby effectively reducing the energy consumption of system operation and equipment loss while improving the efficiency of refrigeration and temperature adjustment operation.
Description
Technical Field
The invention relates to an energy-saving pipeline combined structure for reducing fluid resistance of an efficient cold and heat supply system and a method thereof, belonging to the technical field of cold and heat supply systems.
Background
At present, the annual average energy efficiency of a refrigeration machine room operated by a conventional machine room automatic control system and a management level in China is about 2.5-3.0, the operation energy consumption is high, the refrigeration and temperature regulation efficiency is relatively low, friction between a refrigeration medium and equipment such as pipe fittings and valve pieces of a conveying pipeline in the conveying process is one of important factors causing the phenomenon, and aiming at the problem, a comprehensive treatment scheme and a system which can effectively and comprehensively summarize all environmental factors for the operation of the refrigeration and temperature regulation system are not provided, so that the operation energy consumption of the refrigeration machine room in China is relatively high, but the operation efficiency is insufficient, the operation and maintenance cost of the system is increased while great energy consumption and resource waste are caused, and the whole development direction of low-carbon environmental protection, carbon peak reaching and carbon neutralization is difficult to effectively adapt.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides an energy-saving pipeline combined structure and an energy-saving pipeline combined method for reducing the fluid resistance of a high-efficiency cold and heat supply system, which reduce the friction between a refrigeration medium and a conveying pipeline during conveying and refluxing, thereby achieving the purposes of improving the refrigeration and temperature adjustment operation efficiency and effectively reducing the system operation energy consumption and equipment loss.
An energy-saving pipeline combined structure for reducing fluid resistance of a high-efficiency cold and heat supply system comprises a cold and heat source supply system, main medium supply pipelines, branch medium supply pipelines, long-radius elbows, downstream elbows, speed regulating pumps, control valves and a control circuit, wherein the cold and heat source supply system comprises two or more cold and heat source supply systems which are connected in parallel, at least two main medium supply pipelines are arranged among the two or more cold and heat source supply systems, the main medium supply pipelines are distributed among the main medium supply pipelines in parallel, each main medium supply pipeline is communicated with at least one cold and heat source supply system, the main medium supply pipelines are connected with the cold and heat source supply systems through the long-radius elbows, the main medium supply pipelines are communicated with a plurality of branch medium supply pipelines through the downstream elbows, the joints of the main medium supply pipelines, the cold and heat source supply systems and the branch medium supply pipelines are respectively provided with a control valve and at least two speed regulating pumps, the control circuit is connected with the outer surface of the cold and heat source supply system and is respectively and electrically connected with the cold and heat source supply system, the speed regulating pump and the control valve.
Furthermore, the central angle of the long-radius elbow is between 100 degrees and 170 degrees, and the length of the long-radius elbow is not less than 10 centimeters; the main pipeline of the water diversion elbow is connected with the main medium supply pipeline and coaxially distributed, the branch pipeline of the water diversion elbow is communicated with the branch medium supply pipeline and coaxially distributed, the axis of the branch pipeline of the water diversion elbow is intersected with the axis of the main pipeline of the water diversion elbow and forms an included angle of 15-60 degrees, the distance between the intersection point of the axis of the branch pipeline of the water diversion elbow and the axis of the main pipeline of the water diversion elbow and the inflow end of the main pipeline of the water diversion elbow is 25-65% of the length of the main pipeline of the water diversion elbow, and the diameter of the branch pipeline of the water diversion elbow is not more than 80% of the diameter of the main pipeline of the water diversion elbow.
Furthermore, the main medium supply pipeline and the branch medium supply pipeline respectively comprise a supply pipeline and at least one return pipeline, and each supply pipeline and each return pipeline are provided with at least one pressure sensor and at least one temperature sensor.
Furthermore, in the speed regulating pumps, the speed regulating pumps at the connecting positions of the main medium supply pipeline and the cold and heat source supply system are all connected with the main medium supply pipeline, the speed regulating pumps at the connecting positions of the main medium supply pipeline and the branch medium supply pipeline are all connected with the branch medium supply pipeline, and the speed regulating pumps are connected in parallel.
Furthermore, the control circuit comprises a main control circuit based on the internet of things controller, a programmable controller circuit and a variable frequency speed regulating circuit, wherein the main control circuit based on the internet of things controller is electrically connected with the variable frequency speed regulating circuit and the control valve through the programmable controller circuit respectively, the variable frequency speed regulating circuits are multiple, and each variable frequency speed regulating circuit is electrically connected with the cold and heat source supply system and the speed regulating pump respectively.
Preferably, the method for using the energy-saving pipeline combination structure for reducing the fluid resistance of the high-efficiency cooling and heating system comprises the following steps:
s1, designing a system, namely designing the distribution positions, the installation positions, the pipe diameter parameters and the pipe medium conveying capacity of a cold and heat source supply system, a main medium supply pipeline and a branch medium supply pipeline in a refrigeration and temperature regulation machine room by utilizing a BIM workstation platform and combining a machine room space structure, and completing the primary setting of a refrigeration and temperature regulation system to obtain a primary model of the refrigeration and temperature regulation system;
s2, optimizing system operation logic, adopting a prediction method and a data fusion load measurement method based on data mining for the preliminary model of the refrigeration and temperature regulation system obtained in the step S1, integrating historical cold station operation data, future meteorological parameters and load change conditions predicted within 24 hours, considering different dynamic working conditions to calculate the maximum refrigerating capacity MCC of a single refrigerator, and analyzing the influence of load rate on COP under the same working condition to obtain an operation control logic strategy of the refrigeration and temperature regulation system;
s3, optimizing the temperature regulating medium conveying pressure difference, dynamically adjusting the pressure difference of a water pump according to the actual cooling load requirement at the tail end of the initial model of the refrigeration temperature regulating system optimized in the step S2, dynamically optimizing the pressure difference set value of a primary loop by monitoring the water supply temperature at the secondary side of the heat exchanger in real time, and reducing the number of control valves in a main medium supply pipeline and a branch medium supply pipeline by setting the operation pressure difference of the water pump on one hand, and reducing the friction loss of the temperature regulating medium caused by the control valves; on the other hand, for the operation time sequence and the driving control frequency value of a plurality of speed regulating pumps, the number of the speed regulating pumps is reduced and the operation frequency of the speed regulating pumps in the operation state is improved on the premise of meeting the set flow (namely the pressure difference set value);
s4, optimizing pipelines, and for the initial model of the refrigeration temperature regulating system optimized in the step S3, firstly adjusting the mutual parallel distribution among main medium supply pipelines and branch medium supply pipelines in the same conveying direction in the main medium supply pipelines and the branch medium supply pipelines, then selecting low-resistance pipe fittings and valve parts for the main medium supply pipelines and the branch medium supply pipelines on one hand, and enabling the pipelines in the same type and function in the main medium supply pipelines and the branch medium supply pipelines to be distributed in the plane of the same height on the other hand;
and S5, assembling the pipeline, and after the optimization of the step S4 is completed, performing construction operation according to the optimization design result of the step S4.
The invention can greatly improve the design, construction work efficiency and precision of the refrigeration and temperature regulation base station system, and eliminate the defect of frequent modification of the construction scheme caused by construction errors and construction site factors in construction, thereby greatly improving the work efficiency and quality of construction operation; according to the invention, the pressure difference of the water pump is dynamically adjusted according to the actual cold load requirement at the tail end, the pressure difference set value of a primary loop is dynamically optimized by monitoring the water supply temperature at the secondary side of the heat exchanger in real time, and meanwhile, the number of control valves in a main medium supply pipeline and a branch medium supply pipeline is reduced by setting the operation pressure difference of the water pump, so that the friction loss of a temperature adjusting medium caused by the control valves is reduced; the running time sequence and the driving control frequency value of the plurality of speed regulating pumps are reduced on the premise of meeting the set flow (namely the pressure difference set value), the running number of the speed regulating pumps is reduced, the running frequency of the speed regulating pumps in the running state is improved, the pipeline design and construction cost are effectively simplified, the friction between a refrigeration medium and a conveying pipeline during conveying and refluxing is greatly reduced, and therefore the running energy consumption and the equipment loss of a system are effectively reduced while the refrigeration and temperature regulation working efficiency is improved.
Drawings
The invention is described in detail below with reference to the drawings and the detailed description;
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic diagram of the operational logic system of the present invention;
FIG. 3 is a comparison of monthly operating energy consumption of the present invention and a conventional apparatus;
FIG. 4 is a schematic flow chart of the method of the present invention.
The reference numbers in the figures: the system comprises a cold and heat source supply system 1, a main medium supply pipeline 2, a branch medium supply pipeline 3, a long-radius elbow 4, a water-flowing elbow 5, a speed regulating pump 6, a control valve 7, a control circuit 8, a pressure sensor 9 and a temperature sensor 10.
Detailed Description
In order to facilitate the implementation of the technical means, creation features, achievement of the purpose and the efficacy of the invention, the invention is further described below with reference to specific embodiments.
As shown in fig. 1-2, an energy-saving pipeline combination structure for reducing fluid resistance of a high-efficiency cooling and heating system comprises a cooling and heating source supply system 1, main medium supply pipelines 2, branch medium supply pipelines 3, long-radius elbows 4, downstream elbows 5, speed-regulating pumps 6, control valves 7 and a control circuit 8, wherein at least one cooling and heating source supply system 1 is provided, and when the cooling and heating source supply systems 1 are two or more, the cooling and heating source supply systems 1 are connected in parallel, at least two main medium supply pipelines 2 are provided, the main medium supply pipelines 2 are distributed in parallel, each main medium supply pipeline 2 is communicated with at least one cooling and heating source supply system 1, the main medium supply pipelines 2 are connected with the cooling and heating source supply systems 1 through the long-radius elbows 4, the main medium supply pipelines 2 are communicated with the branch medium supply pipelines 3 through the downstream elbows 5, the connection parts of the main medium supply pipeline 2, the cold and heat source supply system 1 and the branch medium supply pipeline 3 are respectively provided with a control valve 7 and at least two speed regulating pumps 6, and the control circuit 8 is connected with the outer surface of the cold and heat source supply system 1 and is respectively electrically connected with the cold and heat source supply system 1, the speed regulating pumps 6 and the control valve 7.
In the embodiment, the central angle of the long-radius elbow 4 is between 100 degrees and 170 degrees, and the length of the long-radius elbow 4 is not less than 10 centimeters; the main pipeline of the downstream elbow 5 is connected with the main medium supply pipeline 2 and coaxially distributed, the branch pipelines of the downstream elbow 5 are communicated with the branch medium supply pipeline 3 and coaxially distributed, the axis of the branch pipeline of the downstream elbow 5 is intersected with the axis of the main pipeline of the downstream elbow 5 and forms an included angle of 15-60 degrees, the distance between the intersection of the axis of the branch pipeline of the downstream elbow 5 and the axis of the main pipeline of the downstream elbow 5 and the inflow end of the main pipeline of the downstream elbow 5 is 25-65% of the length of the main pipeline of the downstream elbow 5, and the pipe diameter of the branch pipeline of the downstream elbow 5 is not more than 80% of the pipe diameter of the main pipeline of the downstream elbow 5.
Meanwhile, the main medium supply pipeline 2 and the branch medium supply pipeline 3 respectively comprise a supply pipeline and at least one return pipeline, and each supply pipeline and each return pipeline are provided with at least one pressure sensor 9 and at least one temperature sensor 10.
It is to be noted that, in the speed-regulating pumps 6, the speed-regulating pumps 6 at the connection positions of the main medium supply pipeline 2 and the cold and heat source supply system 1 are all connected with the main medium supply pipeline 2, the speed-regulating pumps 6 at the connection positions of the main medium supply pipeline 2 and the branch medium supply pipeline 3 are all connected with the branch medium supply pipeline 3, and the speed-regulating pumps 6 are connected in parallel with each other.
In this embodiment, the control circuit 8 includes a main control circuit based on an internet of things controller, a programmable controller circuit, and a variable frequency speed control circuit, the main control circuit based on the internet of things controller is electrically connected to the variable frequency speed control circuit and the control valve 7 through the programmable controller circuit, the variable frequency speed control circuits are multiple, and each variable frequency speed control circuit is electrically connected to the cold and heat source supply system 1 and the speed control pump 6.
Fig. 3 is a comparison graph of monthly operation energy consumption of the present invention and a conventional apparatus.
Referring to fig. 4, the method for using the energy-saving pipe combination structure of the high-efficiency cooling and heating system for reducing the fluid resistance comprises the following steps:
s1, designing a system, namely designing the distribution positions, the installation positions, the pipe diameter parameters and the pipe medium conveying capacity of a cold and heat source supply system 1, a main medium supply pipeline 2 and a branch medium supply pipeline 3 in a refrigeration and temperature regulation machine room by utilizing a BIM workstation platform and combining a machine room space structure, and completing the preliminary setting of a refrigeration and temperature regulation system to obtain a preliminary model of the refrigeration and temperature regulation system;
s2, optimizing the system operation logic, and calculating the maximum refrigerating capacity MCC of a single refrigerator according to different dynamic states of working conditions by integrating historical operation data of a cold station, future meteorological parameters and the load change condition predicted within 24 hours for the preliminary model of the refrigeration and temperature regulation system obtained in the step S1 by adopting a prediction method based on data mining and a data fusion load measurement method; simultaneously analyzing the influence of the load rate on COP under the same working condition to obtain an operation control logic strategy of the refrigeration and temperature regulation system;
when future meteorological parameters are carried out and load change conditions within 24 hours are predicted, prejudgment is mainly carried out on temperature, humidity, solar radiation, wind power and wind speed parameters, and therefore load dynamic change parameters are obtained according to the change state of the future meteorological parameters.
S3, optimizing the temperature regulating medium conveying pressure difference, dynamically adjusting the pressure difference of a water pump according to the actual cooling load requirement at the tail end of the initial model of the refrigeration temperature regulating system optimized in the step S2, dynamically optimizing the pressure difference set value of a primary loop by monitoring the water supply temperature at the secondary side of the heat exchanger in real time, and reducing the number of control valves 7 in a main medium supply pipeline 2 and a branch medium supply pipeline 3 by setting the operation pressure difference of the water pump on one hand, thereby reducing the friction loss of the temperature regulating medium caused by the control valves 7; on the other hand, the running time sequence and the driving control frequency value of the plurality of speed regulating pumps 6 are reduced on the premise of meeting the set flow (namely the pressure difference set value), and the running number of the speed regulating pumps 6 is reduced, and the running frequency of the speed regulating pumps 6 in the running state is improved;
the start and stop of the freezing water pump, the frequency conversion and the number control are controlled by reading the pressure difference through a sensor arranged on the tail end equipment. The differential pressure is a preset value, the fixed value cannot be flexibly adjusted according to the real-time load requirement, so that the differential pressure resetting can be considered for optimization; the basic principle dynamically adjusts the pressure difference (namely the rotating speed) of the water pump according to the actual cold load requirement of the tail end, and avoids the energy consumption of the water pump from being lost by unnecessary valve sections; the principle is suitable for controlling a tower secondary pump and variable frequency pumps in front of and behind an undaria heat exchanger; the method can save the total energy consumption of the related water pump by 15 to 25 percent;
in addition, the pressure difference reset is adopted, the water supply temperature on the secondary side of the heat exchanger is monitored in real time to dynamically optimize the pressure difference set value of the primary loop, the energy consumption of the water pump can be reduced by more than 10%, and the control stability can be improved.
Controlling the number of the devices: when the timing sequence and the frequency of the water pumps of a plurality of variable speed pumps are controlled, the number of the running water pumps is reduced and the frequency is increased as much as possible on the premise of meeting the flow (namely a pressure difference set value) so as to further reduce unnecessary variable frequency loss (3-5 percent).
Meanwhile, when the speed regulating pump 6 is subjected to variable frequency speed regulation:
the frequency raising strategy comprises the following steps: a differential pressure sensor at the tip; when the cooling water pressure difference is higher than a set value, the system automatically starts a frequency reduction program;
pump reduction strategy: when the water pumps work under a certain frequency, the efficiency is highest, when the frequency is lower than the optimal working interval, the system can automatically calculate the working interval situation if two water pumps run at high frequency, if two water pumps run more optimally, the system starts a pump reduction program, closes one water pump and raises the frequency of the other two water pumps, so that the two water pumps run at the same frequency;
s4, optimizing pipelines, and for the initial model of the refrigeration temperature regulating system optimized in the step S3, firstly adjusting the mutual parallel distribution of the main medium supply pipelines 2 and the branch medium supply pipelines 3 in the same conveying direction in the main medium supply pipelines 2 and the branch medium supply pipelines 3, then selecting low-resistance pipe fittings and valve pieces for the main medium supply pipelines 2 and the branch medium supply pipelines 3 on one hand, and enabling the pipelines of the same type and function in the main medium supply pipelines 2 and the branch medium supply pipelines 3 to be distributed in the same height plane on the other hand;
in the engineering practice, the valve with the minimum resistance in the same function is selected, the valve with the large resistance is eliminated, and the valve is economical in the long term. Valve elements such as filters, check valves, etc.;
when the pipeline is designed, the bend is reduced or the water-flowing bend 5 is adopted, and the resistance can be reduced by 50%;
the equipment is arranged at the same height as much as possible, so that the local resistance loss caused by unnecessary bends can be reduced.
And S5, assembling the pipeline, and after the optimization of the step S4 is completed, performing construction operation according to the optimization design result of the step S4.
The annual average energy efficiency of a refrigeration machine room operated by an automatic control system and a management level of a conventional machine room in China is about 2.5-3.0. After the scheme of the invention is optimized, the energy efficiency can be improved from 3.0 to more than 5.0, the energy efficiency is improved by 66.6%, and the building energy consumption is reduced by 22%.
On one hand, the invention can greatly improve the design and construction work efficiency and precision of the refrigeration and temperature regulation base station system, and eliminate the defect of frequent modification of the construction scheme caused by construction errors and construction site factors in the construction, thereby greatly improving the work efficiency and quality of construction operation; on the other hand, the pipeline design and construction cost are effectively simplified, and the friction between the refrigeration medium and the conveying pipeline during conveying and refluxing is greatly reduced, so that the refrigeration and temperature adjustment working efficiency is improved, and the system operation energy consumption and equipment loss are effectively reduced.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. An energy-saving pipeline composite structure for reducing fluid resistance of a high-efficiency cold and heat supply system is characterized in that: the heat pump water heater comprises a cold and heat source supply system (1), main medium supply pipelines (2), branch medium supply pipelines (3), long-radius elbows (4), downstream elbows (5), a speed regulating pump (6), a control valve (7) and a control circuit (8), wherein when the number of the cold and heat source supply systems (1) is two or more, the cold and heat source supply systems (1) are connected in parallel, the main medium supply pipelines (2) are at least two, the main medium supply pipelines (2) are distributed in parallel, each main medium supply pipeline (2) is communicated with at least one cold and heat source supply system (1), the main medium supply pipelines (2) are connected with the cold and heat source supply systems (1) through the long-radius elbows (4), the main medium supply pipelines (2) are communicated with the branch medium supply pipelines (3) through the downstream elbows (5), and the main medium supply pipelines (2) are communicated with the cold and heat source supply systems (1) and the branch medium supply pipelines (3) 3) The control circuit (8) is connected with the outer surface of the cold and heat source supply system (1) and is respectively electrically connected with the cold and heat source supply system (1), the speed regulating pump (6) and the control valve (7).
2. An energy-saving pipe combination structure for reducing fluid resistance of a high-efficiency cold and heat supply system according to claim 1, wherein: the central angle of the long-radius elbow (4) is between 100 degrees and 170 degrees, and the length of the long-radius elbow (4) is not less than 10 centimeters; the main pipeline of the downstream elbow (5) is connected with the main medium supply pipeline (2) and coaxially distributed, the branch pipeline of the downstream elbow (5) is communicated with the branch medium supply pipeline (3) and coaxially distributed, the axis of the branch pipeline of the downstream elbow (5) is intersected with the axis of the main pipeline of the downstream elbow (5) and forms an included angle of 15-60 degrees, the distance between the intersection of the axis of the branch pipeline of the downstream elbow (5) and the axis of the main pipeline of the downstream elbow (5) and the inflow end of the main pipeline of the downstream elbow (5) is 25-65% of the length of the main pipeline of the downstream elbow (5), and the pipe diameter of the branch pipeline of the downstream elbow (5) is not more than 80% of the pipe diameter of the main pipeline of the downstream elbow (5).
3. An energy-saving pipe combination structure for reducing fluid resistance of a high-efficiency cold and heat supply system according to claim 1, wherein: the main medium supply pipeline (2) and the branch medium supply pipeline (3) respectively comprise a supply pipeline and at least one return pipeline, and each supply pipeline and each return pipeline are respectively provided with at least one pressure sensor (9) and at least one temperature sensor (10).
4. The energy-saving pipe combination structure for reducing fluid resistance of a high-efficiency cold and heat supply system according to claim 3, wherein: in the speed regulating pumps (6), all the speed regulating pumps (6) at the connecting positions of the main medium supply pipeline (2) and the cold and heat source supply system (1) are connected with the main medium supply pipeline (2), the speed regulating pumps (6) at the connecting positions of the main medium supply pipeline (2) and the branch medium supply pipelines (3) are connected with the branch medium supply pipelines (3), and all the speed regulating pumps (6) are connected in parallel.
5. An energy-saving pipe combination structure for reducing fluid resistance of a high-efficiency cold and heat supply system according to claim 1, wherein: the control circuit (8) comprises a main control circuit based on an internet of things controller, a programmable controller circuit and a variable frequency speed regulating circuit, wherein the main control circuit based on the internet of things controller is electrically connected with the variable frequency speed regulating circuit and the control valve (7) through the programmable controller circuit respectively, the variable frequency speed regulating circuits are multiple, and each variable frequency speed regulating circuit is electrically connected with the cold and heat source supply system (1) and the speed regulating pump (6) respectively.
6. The use method of the energy-saving pipeline combined structure for reducing the fluid resistance of the high-efficiency cold and heat supply system is characterized by comprising the following steps:
s1, designing a system, namely designing the distribution position, the installation position, the pipe diameter parameter and the pipe medium conveying capacity of a cold and heat source supply system (1), a main medium supply pipeline (2) and a branch medium supply pipeline (3) in a refrigeration and temperature regulation machine room by utilizing a BIM workstation platform and combining a machine room space structure, and completing the preliminary setting of the refrigeration and temperature regulation system to obtain a preliminary model of the refrigeration and temperature regulation system;
s2, optimizing system operation logic, adopting a prediction method and a data fusion load measurement method based on data mining for the preliminary model of the refrigeration and temperature regulation system obtained in the step S1, integrating historical cold station operation data, future meteorological parameters and load change conditions predicted within 24 hours, considering different dynamic working conditions to calculate the maximum refrigerating capacity MCC of a single refrigerator, and analyzing the influence of load rate on COP under the same working condition to obtain an operation control logic strategy of the refrigeration and temperature regulation system;
s3, optimizing the temperature regulating medium conveying pressure difference, dynamically adjusting the pressure difference of a water pump according to the actual cooling load requirement at the tail end of the initial model of the refrigeration temperature regulating system optimized in the step S2, dynamically optimizing the pressure difference set value of a primary loop by monitoring the water supply temperature at the secondary side of the heat exchanger in real time, and reducing the number of control valves (7) in a main medium supply pipeline (2) and a branch medium supply pipeline (3) and reducing the temperature regulating medium friction loss caused by the control valves (7) by setting the operation pressure difference of the water pump; on the other hand, the running time sequence and the driving control frequency value of the plurality of speed regulating pumps (6) are reduced on the premise of meeting the set value of the pressure difference, and the running number of the speed regulating pumps (6) is reduced, and the running frequency of the speed regulating pumps (6) in the running state is improved;
s4, optimizing pipelines, and for the initial model of the refrigeration temperature regulating system optimized in the step S3, firstly adjusting the mutual parallel distribution among the main medium supply pipelines (2) and the branch medium supply pipelines (3) in the same conveying direction in the main medium supply pipelines (2) and the branch medium supply pipelines (3), then selecting low-resistance pipe fittings and valve parts for the main medium supply pipelines (2) and the branch medium supply pipelines (3) on one hand, and enabling the pipelines in the main medium supply pipelines (2) and the branch medium supply pipelines (3) in the same category and function to be distributed in the same height plane on the other hand;
and S5, assembling the pipeline, and after the optimization of the step S4 is completed, performing construction operation according to the optimization design result of the step S4.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117739500A (en) * | 2023-12-26 | 2024-03-22 | 武汉奇威特建安工程有限公司 | Water power balance adjusting method for heating ventilation air conditioner and energy saving control system |
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