How to implement FFU design air volume? Pay attention to these parameters when using them
Direct answer: FFU design air volume cannot be written in just one value. The project should also clarify the filters, operating gears, resistance conditions and test positions corresponding to the air volume, and then check the static pressure, wind speed uniformity, power consumption and on-site return and return air conditions under the target air volume. Whether the design values can be realized will ultimately be confirmed by complete machine and on-site testing under agreed working conditions.
For clean room and equipment-side projects, 'single FFU design air volume' is the interface parameter between the air system and equipment procurement. If the working conditions are not clearly defined, even if the supplier provides air volume data, it will be difficult to judge whether it corresponds to the actual project.
Design air volume should bring four conditions
Filter configuration. Which one to useHEPA or ULPA filter , will affect the resistance and FFU actual operating point. The test configuration should be consistent with the intended delivery configuration.
Running gear. Production, duty and other modes may use different speeds. Each mode planned to be used should indicate the target air volume, and the highest air volume cannot be used to represent daily operating performance.
resistance conditions. It is necessary to clarify the resistance of the filter and related installation structures, and confirm whether the overall machine performance data includes the filter resistance to avoid omissions or double calculations.
Measurement location. The equipment outlet, terminal air supply volume after installation, and work area wind speed are not the same indicators. The technical agreement should describe the location and method of measurement.
Under the target air volume, what else should be checked?
chooseWhen using an FFU fan filter unit , you should check its performance data at the target air volume instead of extracting the maximum air volume and maximum static pressure from the product information respectively. Static pressure is used to judge the FFU's ability to overcome resistance at this operating point; wind speed uniformity is used to judge whether the wind is suitable for the actual air supply area.
Power consumption and noise at commonly used operating gears also affect long-term operation plans. Equipment-side projects also need to pay attention to the installation height, air inlet and return interfaces and maintenance space; ceiling projects should check whether the FFU size conflicts with the module, beam position and other facilities.
The design value is inconsistent with the actual measured value. Where to check first?
If the on-site air volume is lower than the design value, you should first check the filter model and resistance, FFU control gear, inlet and return air conditions, and measurement methods. If the total air volume meets the requirements, but the airflow in key locations is insufficient, the FFU arrangement and room airflow organization should be checked. The two types of problems are adjusted in different ways.
Aili Industrial can match the configuration of fans, motors, cabinets and complete machines based on project cleanliness requirements, target air volume, designated filters, installation drawings and control methods. For batch projects, it is recommended to first use the prototype to fix the test conditions, and then write the performance and acceptance methods under the design air volume, target air volume into the technical agreement. Specific performance is subject to test results under project conditions.
During technical communication, it is recommended to state directly: 'What filter, what operating gear, what resistance and measurement position is the target air volume required to be achieved?' Explaining these four items clearly is more conducive to obtaining a verifiable FFU solution than just providing an air volume number.
