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Outline
In response to the problem that existing smart damper air flow measurement models cannot accurately describe the relationship between damper angle and air flow. Based on the Bernoulli equation to analyze the functional relationship between damper angle and flow coefficient. The rotation of the damper blade inevitably changes the airflow distribution inside the pipeline. The change in damper angle will affect the flow coefficient. The damper angle compensation is added to the flow measurement model. A new air flow measurement model is built using regression analysis. The flow value can be calculated based on the pressure difference measured by the average pitot tube and the corresponding damper angle. This paper proposes a parameter acquisition method, which sets the frequency range of the fan based on the flow range of the damper, fits the parameter values using the least squares method, and verifies the model. If the flow measurement error is less than 10%, the parameter setting is accurate. Experimental verification was conducted on circular dampers with diameters of 100, 150 mm, as well as square dampers with dimensions of 200 mm×120 mm, based on the smart air flow calibration platform. The results indicate that based on the new flow measurement model, the maximum flow measurement errors of the three different models of dampers are 10%, 6.1%, and 6.6%. Accurate flow measurement can still be achieved by changing the input air volume within the range of 0° ~70° valve angle, effectively solving the existing problem of flow measurement. This proves the feasibility and universality of the new air flow measurement model. The accuracy of flow measurement will directly affect the operation effect of smart dampers and the precision of flow control. The building of the new model provides technical support for precise control and performance improvement of variable air volume systems.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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