Seasonal temperature and humidity changes can alter dust behaviour, filter loading, condensation risk and the energy required to replace extracted air. A system that is stable in dry summer conditions may behave differently during a cold, humid production period.
How humidity affects filtration
Hygroscopic or fine dust can absorb moisture, agglomerate and become more adhesive. This can change discharge behaviour, increase filter pressure drop and reduce the effectiveness of pulse cleaning. Oil or process residues can amplify the effect.
Temperature, air density and condensation
Air density changes with temperature and influences fan duty and mass flow. More importantly, warm humid process air can condense on cold duct or filter surfaces. Condensation may wet dry filter media, promote corrosion and form deposits. Insulation, drainage, controlled make-up air and operating sequences are considered where the dew point can be reached.
Compressed air for pulse-jet cleaning
Moisture or oil in compressed air can damage filter media and make dust sticky. Air quality, drains, pressure and cleaning timing should be checked seasonally rather than assuming the pulse system remains unchanged all year.
Winter air balance and energy use
Extraction removes heated indoor air. Uncontrolled infiltration through doors wastes energy and creates draughts, while insufficient make-up air reduces capture. A coordinated ventilation strategy supplies filtered, conditioned replacement air and maintains the intended building pressure.
Practical seasonal checks
- trend filter differential pressure and cleaning frequency;
- inspect ducts and housings for condensation or corrosion;
- verify compressed-air quality and drains;
- check hoppers and collection containers for sticky material;
- confirm make-up airflow and room pressure when doors and heating conditions change;
- review fan and motor data after major temperature changes.
Adapt the system from measurements
Seasonal optimisation should be based on pressure, airflow, humidity and temperature trends. Changing cleaning parameters or fan speed without diagnosing the cause can hide condensation, leakage or material-handling problems.
Contact ALWO if filter performance changes with the season and requires an assessment of humidity, air balance or operating controls.
