Influence of temperature and humidity to filter efficiency and dust holding capacity

M. Schmidt*, Palas® GmbH, Germany

Changes in the efficiency or loading capacity of air filters may occur due to the influence of the carrier gas flow, especially rel. Humidity and Temperature. Taking this into account ISO Standards focus more on real conditions than in the past. As an example, the ISO 16890 contain a discharge cabinet for filters to simulate the possible degradation of filter efficiency due to ambient influences as e.g. moisture, Temperature or influences from separated particle. But still most of the standards still require a 50% rel. Humidity and Temperatures between 20°C and 25°C with regard to comparable results.

In reality, these filters are used in cars (Cabin air filters, Motor inlet filters), general ventilation systems of buildings or gas turbines or processes where the climatic conditions vary from 10% up to 100% Humidity and Temperatures between -20°C up to 50°C. Influences to the test result caused by different test conditions are thus not evaluated. This is the reason why Palas® has developed the flat sheet media test bench MFP 3000 HF. With the new MFP 3000 HF, it is possible to set the relative humidity from 10 to 80 % and the temperature from -10 to 50 °C. The inflow velocity has been extended as compared with standard models to a range of 4 cm/s – 2 m/s....

....This presentation outlines the technical set-up and climatization characteristics of the new test bench. We will show the possible changes of fractional efficiency and dust loading characteristics of the test sample due to the influence of rel. Humidity and Temperature...

Session: G5 - Filter Test Systems
Day: 14 March 2018
Time: 09:00 - 10:15 h

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