How to calculate the quantity of ULPA? Total air volume and single air supply capacity

The initial calculation of the number of ULPA filters can be divided by the total air volume divided by the available air volume of a single unit under the target working conditions, and rounded to the right direction to meet the demand, and then the layout, coverage and system capabilities are checked. The sample maximum air volume cannot be used as a direct substitute for the actual available value. Quantity calculation seems to be the simplest step, but in fact there are two easy errors: first, the maximum air volume of the sample is used in the denominator instead of the actual operating condition air volume, and second, the calculated number of units has not been reviewed by the layout. If the denominator is too biased, the number of units will be too low, and if the layout is not reviewed, the number of units will be sufficient but cannot be placed. Aili Industrial has both filter and complete machine production capabilities, and can provide actual available air volume data for a single unit according to target working conditions. After the quantity of the batch solution is determined, the delivery batch can be arranged based on the production scheduling capacity.

1. Calculation relationships and units: first write down the formula and value

The initial calculated quantity N = total target air volume ÷ available air volume of a single unit under target operating conditions, rounded up. For example, this is just an arithmetic example: the total capacity is 7200m³/h, the available capacity of a single unit is 1000m³/h, initially calculate at least 8 units, and then check the layout, uniformity and system margin; these values ​​​​are not product parameters.

The denominator in the formula is key. The available air volume of a single unit is the actual air volume under the target resistance and fan operating point after the filter is installed in the system, not the rated air volume on the sample. Aili Industry isThe HEPA/ULPA filter matching solution provides the actual available air volume according to the target working conditions.FFU fan filter unit andThe fan operating point data of the fan filter unit at the EFU equipment end can correspond to the filter resistance, and the denominator value has a basis. The relationship between grade and air supply requirements can be referred toISO cleanliness level comparison。

2. Unify the calculation conditions first: level, resistance and surface wind speed limits must be consistent

Clarify the total air volume target, the basis and unit of single air volume, check the filtration level, resistance and surface wind speed limit, and avoid mixing different specifications into one group.

When calculating batches, the same grade and specifications should be used for the same group of products. If filters of different efficiency levels or sizes are mixed in the same area, the available air volume of a single unit will be different, and calculation based on the average will result in insufficient air volume in some areas. Aili Industry isThe quantity of ULPA ultra-high efficiency filters in the batch plan is calculated according to the same grade and specification.If non-standard ULPA filter projects involve different specifications, they will be grouped and calculated according to specifications and then summarized. The relationship between surface wind speed and single unit air volume can be referred toHEPA FAQs and Selection Guide。

3. Quantity is also affected by space: sufficient arithmetic does not mean reasonable distribution

The shape of the process area, equipment shielding, keel and return air layout may require adjustments to the location or number of modules. Sufficient arithmetic does not mean reasonable distribution.

The calculated number of units is 'how many are needed', and the available space on the ceiling determines 'how many can be laid'. The location of long strip areas, dense equipment areas and return air shafts will affect the actual layout points and density. Aili Industry isIn the FFU fan filter unit batch plan, check the layout points according to the plane layout.Tank seal ULPA filter andThe size of the partition-less ULPA ultra-high-efficiency filter corresponds to the ceiling module. It can be confirmed based on the actual size of the product when reviewing the layout. The relationship between layout and quantity can be referred toULPA ultra-high efficiency filter FAQ and selection guide。

4. Check the overall system and redundancy: the operating conditions under maintenance should be agreed in advance

Check the fan, power supply, group control and backup requirements. What conditions still need to be met after reducing the number of modules during maintenance should be agreed in advance.

The quantity plan not only takes into account the normal operating status, but also the maintenance status. When some modules are shut down and replaced, whether the remaining modules can maintain the basic protection conditions of the area needs to be agreed upon in the planning stage. Aili Industry isThe FFU computer group control system supports partition management, and the operating status of adjacent areas can be retained during maintenance.The speed adjustment capability of the FFU fan filter unit can adjust the operating parameters of the remaining modules when some modules are shut down, alleviating insufficient air supply during maintenance. For operating conditions in maintenance status, please refer toEFU FAQ and technical support。

5. Related questions and answers

What should I do when the total air volume is initially calculated to be seven points?
It cannot be simply rounded up, it should be rounded up to eight units, and the layout and adjustment range of the eight-unit solution should be checked at the same time.

If the filter area is enough, then there is no need to count the quantity?
Area and quantity are related to each other, and the air volume, structure and system allocation of each unit still need to be confirmed.

What needs to be reviewed after the quantity is calculated?
It is necessary to review the layout space, return air conditions, operating capacity under maintenance and system margin.

6. Related articles

ULPA ultra-high efficiency filter FAQ and selection guide

No partition ULPA ultra high efficiency filter

FFU computer group control system

HEPA FAQs and Selection Guide

7. Key points for selection and acceptance inspection

8. Product matching and technical support from Aili Industrial

Aili Industry has both filter and complete machine production capabilities.The HEPA/ULPA filter matching solution provides the actual available air volume according to the target working conditions.FFU fan filter unit andThe fan operating point data of the fan filter unit on the EFU equipment side corresponds to the filter resistance, and the denominator of the quantity calculation has a basis. In batch planThe quantity of ULPA ultra-high efficiency filters is calculated according to the same grade and specification.Non-standard ULPA filters are calculated in groups when involving different specifications.The FFU fan filter unit batch plan is checked according to the plane layout and the points can be arranged.Tank seal ULPA filter andThe size of the partitionless ULPA ultra-high efficiency filter corresponds to the ceiling module;The FFU computer group control system supports partition management to facilitate operation arrangements under maintenance status. After the quantity plan is determined, the delivery batch can be arranged based on the production scheduling capacity. Provide process objectives, installation drawings, operating conditions and acceptance requirements, and can further communicate ULPA standard specifications, non-standard interfaces, samples and batch matching. The specific parameters and test range are based on the confirmed model and technical documents.