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Multi-zone measurement of particle concentrations in a HVAC building with massive printer emissions: influence of human occupation and particle transport indoors

Chatoutsidou Sofia-Eirini, Serfozo Norbert, Glytsos Theodoros, Lazaridis Michalis

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Περίληψη

Particle number (PN) and mass (PM) concentrations were measured in four offices in a HVAC building, one of them corresponding to a printer room. On-line monitoring of the indoor PM concentrations was accompanied with monitoring of the outdoor concentration. In addition, black carbon was measured in two of the selected offices. PN concentrations were measured with a variety of instruments (SMPS,NanoScan, P-Trak) covering a range between 10 nm and 9 μm, whereas PM10 mass concentrations were measured with several DustTraks. Cleaning activities and printing were identified as the most significant indoor sources for ultrafine particles with the latter resulting in a substantial increase of indoor PN<1 concentrations in the printer room during workdays. Moreover, indoor transport of fine particles from the printer room was found to have an important contribution to both indoor PN<1 and PM10 concentrations in two of the rest three offices. The physical presence of the occupants had an impact on particles >2.5 μm during workdays due to particle resuspension. However, when the offices were not occupied (night, weekend) the outdoor environment was a strong contribution to indoor concentrations. Lastly, black carbon preserved low concentrations in both under study offices and was not associated with printer emissions suggesting that black carbon is not an appropriate measure for assessing printer emissions.

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