A method and system for dynamic balancing and commissioning of ventilation and air conditioning based on CFD simulation

Abstract

This invention discloses a dynamic balancing and commissioning method and system for ventilation and air conditioning based on CFD simulation. The method includes: simulating the regulating components using CFD simulation software to obtain the airflow-static pressure characteristic curve of the regulating components; simulating the entire tested duct system using CFD simulation software to obtain the front static pressure of the regulating component on each duct branch; obtaining the rear static pressure of the regulating component based on its airflow-static pressure characteristic curve, and determining the pressure difference between the front and rear static pressures of the regulating component on each duct branch based on the front static pressure of the regulating component; and determining the specific adjustment degree of the regulating component on each duct branch within the tested duct system based on the airflow-static pressure characteristic curve of the regulating component and the pressure difference between the front and rear static pressures of the regulating component on each duct branch. This invention obtains the specific adjustment degree on-site through software simulation, significantly reducing the cumbersome steps in the actual on-site commissioning process and solving the problems of low efficiency and impact on construction and production caused by existing balancing and commissioning technologies.

Description

Technical Field

[0001] This invention relates to the field of ventilation and air conditioning system commissioning technology, specifically to a dynamic balance commissioning method and system for ventilation and air conditioning based on CFD simulation. Background Technology

[0002] Today, low carbon has become a requirement and responsibility of our time. Building operation, especially the operation of air conditioning systems, is an important part of social energy consumption. Poor balance and regulation not only result in poor user experience, but also in low system operating efficiency and increased energy consumption.

[0003] Existing air conditioning system balancing and commissioning methods typically follow a sequence: first, the total air volume is balanced, then the branch air volume is balanced. This is achieved by using an airflow hood or an anemometer to measure the airflow at the end of the branch ducts. To achieve balance across all branches, an anemometer is first used to measure the airflow at all vents in the system under test. The calculated percentage ratio of the measured airflow to the design airflow at each vent is then listed to identify a benchmark vent. Starting with the vent furthest from the fan, measurements are taken one by one, and the damper opening is adjusted. This process is cumbersome and rarely achieves high-precision balancing. Traditional vent airflow balancing tests, such as... Figure 1 As shown.

[0004] The disadvantages of using traditional methods to debug air conditioning systems include:

[0005] 1. Low debugging efficiency, which seriously affects the construction progress for projects with tight schedules;

[0006] 2. Inability to achieve high-precision balancing adjustments affects the operating efficiency of the air conditioning system;

[0007] 3. There are many uncontrollable factors in the debugging process (human factors, accuracy of test equipment, on-site environment, etc.), and it is impossible to verify system parameters in the early stage of debugging. We can only rely on on-site test data. If the design requirements cannot be met through on-site debugging, we can only choose to replace the equipment and adjust the system parameters. Summary of the Invention

[0008] To overcome the shortcomings of the prior art, the present invention provides a dynamic balance debugging method and system for ventilation and air conditioning based on CFD simulation, in order to solve at least one of the above-mentioned technical problems.

[0009] According to one aspect of the present invention, a dynamic balance adjustment method for ventilation and air conditioning based on CFD simulation is provided, comprising:

[0010] The regulating component was simulated using CFD simulation software, and the air volume-static pressure characteristic curve of the regulating component was obtained.

[0011] The entire duct system under test was simulated using CFD simulation software to obtain the static pressure before the regulating component on each duct branch.

[0012] The static pressure after the regulating component is obtained based on the air volume-static pressure characteristic curve of the regulating component, and the pressure difference between the static pressure before and after the regulating component is determined in combination with the static pressure before the regulating component on each duct branch.

[0013] Based on the airflow-static pressure characteristic curve of the regulating component and the pressure difference value of the static pressure before and after the regulating component on each duct branch, the specific degree of regulation of the regulating component on each duct branch in the tested duct system is determined.

[0014] The above technical solution uses CFD software to simulate the performance of a single regulating component and determine the adjustability of the regulating component on each branch of the entire tested duct system. The software simulation yields the specific adjustment level on-site, greatly reducing the cumbersome steps in the actual on-site debugging process and solving the problems of low efficiency and impact on construction and production caused by existing technologies.

[0015] As a further technical solution, the method also includes:

[0016] The regulating components of the tested duct system were modeled using CFD simulation software, and the static pressure of the regulating components under different conditions was tested.

[0017] The static pressure of the physical body of the regulating component under different conditions was tested in the laboratory;

[0018] By fitting the static pressure data from the software test with the static pressure data from the physical test, and adjusting the parameter settings of the CFD simulation software based on the fitting results, the parameter settings of the CFD simulation software during the dynamic balance debugging of ventilation and air conditioning are determined.

[0019] The above technical solution corrects the software simulation parameters by fitting simulated data with laboratory measured data, so that the simulation software parameters used for dynamic balance debugging of ventilation and air conditioning conform to the actual situation, thereby achieving high-precision balance debugging.

[0020] As a further technical solution, the method also includes:

[0021] After the entire duct system under test is modeled, simulation tests are conducted to obtain simulation test data.

[0022] High-precision testing instruments were used to test the actual air ducts on site to obtain actual test data;

[0023] The simulated test data is fitted to the actual test data, and the parameter settings of the CFD simulation software are optimized based on the fitting results.

[0024] As a further technical solution, the method also includes:

[0025] The static pressure and airflow of the regulating component were tested in the laboratory under different conditions, and the airflow-static pressure characteristic curve of the regulating component was obtained from the physical test.

[0026] The regulating component was simulated using CFD simulation software with adjusted parameters, and the air volume-static pressure characteristic curve of the regulating component was obtained.

[0027] Compare the airflow-static pressure characteristic curve of the regulating component in physical testing with the airflow-static pressure characteristic curve of the regulating component in software simulation. If the difference between the two exceeds the threshold range, adjust the parameter settings of the CFD simulation software.

[0028] The above technical solution verifies the accuracy of the simulation through experimental data and adjusts the parameter values ​​of the simulation software to ensure that the test data obtained through the simulation software is consistent with that of the laboratory, thereby guaranteeing the debugging accuracy.

[0029] As a further technical solution, the method also includes:

[0030] During on-site commissioning, adjust each adjustment component to the corresponding degree according to the specific adjustment degree of each duct branch, and the dynamic balance commissioning of ventilation and air conditioning can be completed.

[0031] As a further technical solution, the regulating component is an air valve, and the simulation test is conducted on the static pressure of the air valve at different opening degrees.

[0032] As a further technical solution, the adjusting component is a duct elbow, tee, or air outlet, and the simulated test is the static pressure of the duct elbow, tee, or air outlet under different sizes.

[0033] According to one aspect of the present invention, a dynamic balancing and debugging system for ventilation and air conditioning based on CFD simulation is provided for implementing the method, the system comprising:

[0034] The software simulation end is used to simulate the regulating components using CFD simulation software, obtaining the airflow-static pressure characteristic curve of the regulating components; it also uses CFD simulation software to simulate the entire tested duct system, obtaining the static pressure before the regulating component on each duct branch; based on the airflow-static pressure characteristic curve of the regulating component, the static pressure after the regulating component is obtained, and combined with the static pressure before the regulating component, the pressure difference value of the static pressure before and after the regulating component on each duct branch is determined; based on the airflow-static pressure characteristic curve of the regulating component and the pressure difference value of the static pressure before and after the regulating component on each duct branch, the specific adjustment degree of the regulating component on each duct branch in the tested duct system is determined.

[0035] The on-site commissioning unit is used to adjust each adjustment component to the corresponding degree according to the specific adjustment degree of each duct branch, thereby completing the dynamic balance commissioning of ventilation and air conditioning.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] (1) The present invention can greatly reduce the tedious steps in the actual on-site debugging process, improve debugging efficiency, and save construction time.

[0038] (2) The present invention can significantly improve the accuracy of wind system balance debugging and the system operating efficiency.

[0039] (3) The present invention performs system verification in advance. If the simulation test data cannot meet the design requirements, it can be optimized before on-site implementation to reduce the risk of on-site dismantling and modification. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of a traditional air vent air volume balance test.

[0041] Figure 2 This is a 1:1 modeling diagram of a wind valve according to an embodiment of the present invention.

[0042] Figure 3 This is a simulated side view of a wind valve according to an embodiment of the present invention.

[0043] Figure 4 This is a schematic diagram comparing the characteristic curves of the air valve according to an embodiment of the present invention.

[0044] Figure 5 This is a 1:1 modeling diagram of the duct system under test according to an embodiment of the present invention.

[0045] Figure 6 This is a detailed modeling diagram of an elbow and a normally open fire damper according to an embodiment of the present invention.

[0046] Figure 7 This is a schematic diagram of a duct system simulation according to an embodiment of the present invention.

[0047] Figure 8 This is a schematic diagram of the simulated flow trajectory of a duct system according to an embodiment of the present invention.

[0048] Figure 9 This is a flowchart of the dynamic balancing and commissioning process of a CFD-simulated wind system according to an embodiment of the present invention. Detailed Implementation

[0049] The technical solutions of various embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] This invention provides a dynamic balancing and commissioning method for ventilation and air conditioning systems based on CFD simulation. The method includes: simulating regulating components using CFD simulation software to obtain the airflow-static pressure characteristic curve of the regulating components; simulating the entire tested duct system using CFD simulation software to obtain the front static pressure of the regulating component on each duct branch; obtaining the rear static pressure of the regulating component based on its airflow-static pressure characteristic curve, and determining the pressure difference between the front and rear static pressures of the regulating component on each duct branch based on the front static pressure of the regulating component; and determining the specific adjustment degree of the regulating component on each duct branch within the tested duct system based on the airflow-static pressure characteristic curve of the regulating component and the pressure difference between the front and rear static pressures of the regulating component on each duct branch. This method achieves high-precision balancing and commissioning, improves the operating efficiency of the air conditioning system, and accelerates the efficiency of electromechanical commissioning at the construction site.

[0051] Understandably, CFD simulation software can simulate data that is identical to real-world data, provided the appropriate parameter settings are found. Therefore, by fitting laboratory test data with simulated data, a suitable setting can be found to make the simulated data closely resemble real-world data.

[0052] As one implementation method, such as Figure 2-9 As shown, using a damper as the regulating component, the CFD simulation-based dynamic balance debugging method for ventilation and air conditioning specifically includes the following steps:

[0053] Step 1: First, perform a 1:1 detailed model of the regulating valve of the duct system under test. Use CFD simulation software to test the pressure difference before and after the valve at different opening degrees. Based on the different simulation software used, the different mesh generation accuracy, and other factors that affect the simulation results, organize the data obtained from the simulation test.

[0054] Step 2: Test the valve in the laboratory using high-precision measuring instruments.

[0055] Test content: Test the air volume and static pressure of the damper at different opening degrees, and plot the test results as an air volume-static pressure characteristic curve.

[0056] The test content is consistent with the CFD simulation test content, and the obtained data is the actual data. By analyzing the fit between the simulation data and the actual data, a setting method for CFD simulation software is found.

[0057] Specifically, using data obtained from laboratory tests as a reference, the environmental parameters and mesh accuracy within the simulation software are adjusted to match the experimental data values. This setting method in the software yields data identical to the actual data, proving that data obtained using CFD simulation software can be directly used in engineering projects.

[0058] Step 3: Following the settings in Step 2, the characteristic curve of the duct regulating valve can be simulated and tested. The horizontal axis of the curve represents the valve opening, and the vertical axis represents the pressure difference across the valve.

[0059] Step 4: After obtaining the valve characteristic curve, perform a 1:1 detailed model of the entire duct system. Theoretically, as long as the pressure difference before and after the valve in the system is obtained, the valve's opening degree in this system can be determined.

[0060] Step 5: Following the simulation setup scheme summarized in Step 2, conduct a simulation test on the entire duct system to obtain the static pressure before the valve of each duct branch. This allows you to calculate the pressure difference before and after the valve. The static pressure after the valve was already obtained when plotting the valve characteristic curve.

[0061] Step Six: Based on the valve characteristic curves obtained in Step Three and the pressure differences across each branch valve obtained in Step Five, the specific opening degree of each branch valve in the system can be directly determined. During on-site commissioning, simply adjust each valve to the pre-tested opening degree according to the test results to complete the balancing commissioning. In actual project engineering, other duct systems can also be commissioned using this method. At this point, the CFD simulation dynamic balancing commissioning method for ventilation and air conditioning is complete.

[0062] Preferably, step four can be optimized. After the overall duct system modeling is completed, if the data obtained from the simulation test does not fit the actual data, high-precision testing instruments can be used to test the actual duct on site and obtain the actual data. By fitting the actual data with the simulation data, the software simulation settings can be further clarified.

[0063] Optionally, it is also fully applicable to the entire duct system except for air valves, such as duct elbows, tees, and air outlets. The obtained simulation data can directly guide on-site commissioning.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of the present invention.

Claims

1. A dynamic balance adjustment method for ventilation and air conditioning based on CFD simulation, characterized in that, include: The regulating component was simulated using CFD simulation software, and the air volume-static pressure characteristic curve of the regulating component was obtained. The entire duct system under test was simulated using CFD simulation software to obtain the static pressure before the regulating component on each duct branch. The static pressure after the regulating component is obtained based on the air volume-static pressure characteristic curve of the regulating component, and the pressure difference between the static pressure before and after the regulating component is determined in combination with the static pressure before the regulating component on each duct branch. Based on the air volume-static pressure characteristic curve of the regulating component and the pressure difference value of the static pressure before and after the regulating component on each duct branch, determine the specific degree of regulation of the regulating component on each duct branch in the tested duct system. The method further includes: The regulating components of the tested duct system were modeled using CFD simulation software, and the static pressure of the regulating components under different conditions was tested. The static pressure of the physical body of the regulating component under different conditions was tested in the laboratory; By fitting the static pressure data from the software test with the static pressure data from the physical test, and adjusting the parameter settings of the CFD simulation software based on the fitting results, the parameter settings of the CFD simulation software during the dynamic balance debugging of ventilation and air conditioning are determined.

2. The method for dynamic balance adjustment of ventilation and air conditioning based on CFD simulation according to claim 1, characterized in that, The method further includes: After the entire duct system under test is modeled, simulation tests are conducted to obtain simulation test data. High-precision testing instruments were used to test the actual air ducts on site to obtain actual test data; The simulated test data is fitted to the actual test data, and the parameter settings of the CFD simulation software are optimized based on the fitting results.

3. The method for dynamic balance adjustment of ventilation and air conditioning based on CFD simulation according to claim 1, characterized in that, The method further includes: The static pressure and airflow of the regulating component were tested in the laboratory under different conditions, and the airflow-static pressure characteristic curve of the regulating component was obtained from the physical test. The regulating component was simulated using CFD simulation software with adjusted parameters, and the air volume-static pressure characteristic curve of the regulating component was obtained. Compare the airflow-static pressure characteristic curve of the regulating component in physical testing with the airflow-static pressure characteristic curve of the regulating component in software simulation. If the difference between the two exceeds the threshold range, adjust the parameter settings of the CFD simulation software.

4. The method for dynamic balance adjustment of ventilation and air conditioning based on CFD simulation according to claim 1, characterized in that, The method further includes: During on-site commissioning, adjust each adjustment component to the corresponding degree according to the specific adjustment degree of each duct branch, and the dynamic balance commissioning of ventilation and air conditioning can be completed.

5. The method for dynamic balance adjustment of ventilation and air conditioning based on CFD simulation according to claim 1, characterized in that, The regulating component is an air valve, and the simulation test is conducted on the static pressure of the air valve at different opening degrees.

6. The method for dynamic balance adjustment of ventilation and air conditioning based on CFD simulation according to claim 1, characterized in that, The adjustment components are duct elbows, tees, or air outlets, and the simulated test is the static pressure of the duct elbows, tees, or air outlets at different sizes.

7. A dynamic balancing and debugging system for ventilation and air conditioning based on CFD simulation, used to implement the method according to any one of claims 1-6, characterized in that, The system includes: The software simulation end is used to simulate the regulating components using CFD simulation software, obtaining the airflow-static pressure characteristic curve of the regulating components; it also uses CFD simulation software to simulate the entire tested duct system, obtaining the static pressure before the regulating component on each duct branch; based on the airflow-static pressure characteristic curve of the regulating component, the static pressure after the regulating component is obtained, and combined with the static pressure before the regulating component, the pressure difference value of the static pressure before and after the regulating component on each duct branch is determined; based on the airflow-static pressure characteristic curve of the regulating component and the pressure difference value of the static pressure before and after the regulating component on each duct branch, the specific adjustment degree of the regulating component on each duct branch in the tested duct system is determined. The on-site commissioning unit is used to adjust each adjustment component to the corresponding degree according to the specific adjustment degree of each duct branch, thereby completing the dynamic balance commissioning of ventilation and air conditioning.

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