What to do if condensation occurs on the surface of ULPA? Dew point and operating conditions troubleshooting

Dew condensation on the surface of the ULPA filter requires comparing the surface temperature with the air dew point, and checking for cold bridges, water leakage and shutdown temperature differences. Repeated condensation may affect the filter material, colloid and seal. Do not just wipe the surface dry. The physical conditions for condensation are clear: the surface temperature is lower than the dew point temperature of the surrounding air. However, during actual troubleshooting, the problem is often not 'the air is too humid' but 'the surface temperature at a certain location is abnormally low' - short circuit of cold air, heat conduction of metal parts, and changes in temperature difference after shutdown, may cause the local surface temperature to be lower than the dew point, while the overall humidity reading in the room looks normal. Aili Industrial's product lines cover conventional fiberglass andDifferent filter materials such as PTFE HEPA/ULPA filters can be matched with humidity-resistant solutions according to the temperature and humidity conditions of the operating environment.FFU fan filter unit andthe fan filter unit at the EFU equipment end to reduce the risk of condensation from both the selection and operation aspects.The air flow path and temperature and humidity changes after shutdown are also considered in the supporting design of

1. Record the actual temperature and humidity: the average value in the room is normal, but condensation may occur locally.

Measure relevant air and cold surface conditions, paying attention to start-up, shutdown and seasonal changes. The average room humidity is normal, but condensation may occur in local low-temperature locations.

Room temperature and humidity sensors are usually installed in representative locations and reflect the overall environment. Condensation often occurs in local locations: the edge of the filter frame near the cold air inlet, areas in direct contact with metal structures, and areas where the temperature drops rapidly after shutdown. Surface temperatures and local air conditions at these locations may differ from room averages. Aili Industry isHEPA/ULPA filters are delivered with the temperature and humidity applicable range of the corresponding model.Materials such as PTFE HEPA/ULPA filters have corresponding applicable conditions in terms of moisture resistance. After the project team measures the surface temperature and local air conditions, it can be compared with the applicable scope to determine. The relationship between levels and filtering requirements can be found inISO cleanliness level comparison。

2. Check the entry path of moisture: condensation, dripping water and airflow containing liquid droplets should be separated

Distinguish between condensation, dripping water from overhead pipelines and airflow containing liquid droplets, and check insulation, airflow mixing and temperature control strategies to avoid dealing with the wrong source.

There are three typical sources of moisture for condensation: first, condensation, when the air reaches the dew point and condenses on a low-temperature surface; second, there is leakage in the upper pipeline or structure, and water drops fall onto the surface of the filter; third, droplets are entrained in the air flow, such as excessive humidification or water in the cooling coil. The three sources are treated in completely different ways: condensation requires adjustments to temperature or airflow, water leaks require pipe repairs or insulation, and airflow containing droplets requires adjustments to the air handling process. Aili Industry isFFU fan filter unit andthe fan filter unit at the EFU equipment end , the cause of condensation can be analyzed based on the equipment operating mode and air flow path.In the supporting communication of Non-standard ULPA filter projects can evaluate the moisture-proof requirements of filter materials and structures based on site conditions. For the judgment method of moisture treatment, please refer toHEPA FAQs and Selection Guide。

3. Confirm whether the filter element is affected: the media, glue seams and frame should be inspected separately.

Assess the status of media, glue joints and frames, and re-inspect according to model and project requirements. Before the environmental reasons are rectified, it is not suitable to run directly after repeated core replacement.

Drying the surface does not mean that the filter element condition has been restored. When the filter material gets wet, the pleats may deform and the resistance characteristics may change. The glue joints getting wet may affect the bonding strength, and the frame getting wet may affect the sealing fit. Aili Industry isWhen the ULPA ultra-high-efficiency filter is delivered, the integrity judgment method of the model can be explained. After getting wet, the same method is used to detect leaks, which is more reliable than judging by visual inspection alone;The sealing liquid of the liquid tank seal ULPA filter may change in state after being dampened or diluted, and needs to be confirmed according to the model requirements. Please refer to the inspection points for moisture-damaged scenarios on the device side.EFU FAQ and technical support。

4. When the cold air short-circuit rushes to a corner of the filter frame, local condensation may appear before the humidity alarm.

When the cold air short-circuit rushes to a corner of the filter frame, local condensation may occur before the room humidity alarm occurs. The air flow and surface temperature should be checked. Cold air blows directly to a certain part of the filter frame or box, and the surface temperature at that location is lowered. Even if the room humidity is within the normal range, the dew point may be reached locally.

Aili Industry isFFU fan filter unit package, the possibility of cold air short circuit can be evaluated based on the air supply direction and equipment layout.In the For equipment-side models such as ultra-thin EFU , the relationship between the air outlet direction and the surrounding structure should be considered in the structural design; when local condensation is found, check from both the airflow path and surface temperature, rather than simply raising the room temperature or lowering the humidity. The relationship between airflow path and condensation can be referred toULPA ultra-high efficiency filter FAQ and selection guide。

5. Related questions and answers

Can condensation be blown away by increasing the wind speed?
It cannot replace dew point and water source rectification. Applicable temperature, humidity and air flow conditions should be restored first.

The room humidity is normal, why is there still condensation?
Condensation depends on the relationship between local surface temperature and dew point. Normal room average does not mean normal in every location.

Can I still use it after drying it after condensation?
The condition of the media, glue joints and frame should be evaluated, and the decision should be made after re-inspection according to the model requirements. Do not just wipe the surface dry.

6. Related articles

ULPA ultra-high efficiency filter FAQ and selection guide

PTFE HEPA/ULPA high efficiency filter

Liquid tank seal ULPA ultra high efficiency filter

HEPA FAQs and Selection Guide

7. Key points for selection and acceptance inspection

8. Product matching and technical support from Aili Industrial

Aili Industrial's product lines cover conventional fiberglass andDifferent filter materials such as PTFE HEPA/ULPA filters can be matched with humidity-resistant solutions according to the temperature and humidity conditions of the operating environment.HEPA/ULPA filters are delivered with the temperature and humidity applicable range of the corresponding model.ULPA ultra-high efficiency filter can be used to explain the integrity judgment method.FFU fan filter unit andThe supporting communication of the fan filter unit at the EFU equipment end can analyze the cause of condensation based on the operating mode and air flow path.For equipment-side models such as ultra-thin EFU , the relationship between the air outlet direction and the surrounding structure is considered in the structural design.the liquid tank seal ULPA filter is confirmed according to the model requirements.The sealing fluid status of Non-standard ULPA filter projects can evaluate filter material and structural moisture-proof requirements based on site conditions. 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.