Vehicle cabin air quality – influence of air recirculation on energy use, particles and CO2
Artikel i vetenskaplig tidskrift, 2023
Increased REC shows advantages in all the three climates in reducing particles and climate power for the studied vehicle. Application of 70% REC (70% of ventilation air is recirculated air) on average lowers PM2.5 by 55% and 39% for a new and aged filter respectively. 70% REC with a new filter reduces cabin PM2.5 below guideline of 15 μg/m3 in all conditions. The reduction of UFP counts results are generally similar to that of PM2.5. Increased REC also lessens the average climate system power by up to 27 % on average.
When REC is increased, the cabin CO2 concentration arise accordingly, and the magnitude is relevant to the passengers. In all studied conditions with 1 passenger, 70% REC does not increase CO2 above the common guideline of 1000 ppm. 70% REC is not recommended with more than 1 passengers in cold and intermediate climate, and 2 passengers in warm climate. Besides, to avoid the potential windscreen fog risk in cold climate, REC should be avoided when passengers are more than 3.
Except for constant REC values, a sample study investigates a dynamic control of the REC. It shows the possibility of continuously optimizing REC to reduce the climate power and particles, while maintaining the CO2 concentration below 1000 ppm. In warm climate with 1 passenger boarded, the average optimized REC is 90%, which in comparison with base case lead to 44% PM2.5 reduction and 12% climate power reduction.
control
energy
filtration
ventilation
climate
particles
HVAC
Författare
Dixin Wei
Chalmers, Arkitektur och samhällsbyggnadsteknik, Installationsteknik
Filip Nielsen
Volvo Cars
Hannes Karlsson
Volvo Cars
Lars Ekberg
Chalmers, Arkitektur och samhällsbyggnadsteknik, Installationsteknik
Jan-Olof Dalenbäck
Chalmers, Arkitektur och samhällsbyggnadsteknik, Installationsteknik
Environmental Science and Pollution Research
0944-1344 (ISSN) 16147499 (eISSN)
Vol. 30 15 43387-43402Styrkeområden
Energi
Ämneskategorier
Farkostteknik
DOI
10.1007/s11356-023-25219-x