PM2.5 and ultrafine particles in passenger car cabins in Sweden and northern China—the influence of filter age and pre-ionization
Artikel i vetenskaplig tidskrift, 2020

The main aim of the study was to evaluate the influence of filter status (new and aged), pre-ionization, on the particle filtration in modern passenger cars. Measurements of in-cabin and outside PM2.5 (dp < 2.5 μm) concentration and UFP (ultrafine particle, dp < 100 nm) counts, to calculate I/O (indoor to outdoor) ratios, were performed. They were done at two locations, to study the influence of different outside conditions on the HVAC (heating, ventilation, and air-conditioning) system. The measurements were performed in two new cars, with similar HVAC systems and settings, using a new and an aged synthetic filter.  Furthermore, an ionization unit was installed upstream of the filter in both cars. This enabled the study of filter status, with and without ionization, under common driving conditions. The results show that the HVAC system performances were very similar at the two locations, with average I/O ratios of 0.35-0.40 without ionization and 0.15-0.20 with ionization applied, although the outside conditions were considerably different. Furthermore, the aged filter clearly worsened the filtration ability. Considering the corresponding average PM2.5 I/O ratios in one location as an example, the average for the new filter was 0.20 and 0.60 for the aged filter. The corresponding UFP I/O ratios were 0.24 and 0.57. Other findings are that the aged filter with ionization reached a performance close to the new filter (without ionization), and that increased ventilation airflow and decreased recirculation degree, as expected, led to an increase of I/O ratio for both particle sizes.

UFP

PM2.5

recirculation

vehicle cabin

filter

ionization

airflow

Författare

Dixin Wei

Volvo Cars

Chalmers, Arkitektur och samhällsbyggnadsteknik, Installationsteknik

Filip Nielsen

Volvo Cars

Lars Ekberg

Installationsteknik

Anders Löfvendahl

Volvo Cars

Maria Bernander

Volvo Cars

Jan-Olof Dalenbäck

Chalmers, Arkitektur och samhällsbyggnadsteknik, Installationsteknik

Environmental Science and Pollution Research

0944-1344 (ISSN)

Ämneskategorier

Maskinteknik

Naturresursteknik

Miljövetenskap

Drivkrafter

Hållbar utveckling

Styrkeområden

Transport

DOI

10.1007/s11356-020-09214-0

Mer information

Senast uppdaterat

2020-06-03