Monitoring of Air Infiltration in Museums, Case study: The National Museum of Fine Arts, Stockholm, Sweden. Contribution to The 6 th Indoor Air Quality.

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SEPTEMBER 2019 ISSUE/42 nd VOLUME.

Presentation transcript:

Monitoring of Air Infiltration in Museums, Case study: The National Museum of Fine Arts, Stockholm, Sweden. Contribution to The 6 th Indoor Air Quality Meeting, Padova, November , CarlAxel Boman, Pentiaq AB, Gavle, Sweden. Jan Holmberg, The Royal Institute of Technology, Stockholm, Sweden Hans Stymne, University of Gavle, Sweden

ground floor 2 nd floor 1 st floor entrancr

entrance hallstair well The stair wells in Picture by Ny Illustrerad Tidning 1866.

ground floor 2 nd floor 1 st floor entrance ? ventilation by infiltration ?? ?

ground floor 2 nd floor 1 st floor entrancr zone A zone B 2-zone-set up

tracer gas sourcesampler

 p = the local mean age of air C p = local tracer concentration S = the tracer gas emission rate V = the zone volume ACH = air changes rate  = the local mean age of air Ventilation measurement technique, the homogeneous emission technique

four measurement cases 1. normal position, ventilation off 2. stairwell sealed, ventilation off 4. normal position, ventilation on3. entrance sealed, ventilation off

caseventsealing infitration entrance net flow to 2 nd floor off/onentrance stairwell [m 3 /h]ACH[m 3 /h][%] 1off offseald offseald on Air flow infiltration results with different cases

ground floor 2 nd floor 1 st floor Case 1. Air flows, [m 3 /h], ventilation system off

ground floor 2 nd floor 1 st floor Case 2. Air flows, [m 3 /h], ventilation system off

ground floor 2 nd floor 1 st floor Case 3. Air flows, [m 3 /h], ventilation system off

ground floor 2 nd floor 1 st floor Case 4. Air flows, [m 3 /h], ventilation system on 9400

Indoor climate and wether conditions during the measurements Indoors: temperature: 19.4 – 20.8 °C relative air hunidity: 22 – 26 %RH Outdoors: temperature: – 2.6 °C relative air hunidity: 72 – 92 %RH

Conclusions To improve indoor climate in historic buildings: it is necessary to keep the air infiltration rate under control it is of great importance to know the air infiltration the homogeneous tracer gas method is suitable and reliable For the National Museum of Fine Arts to get good indoor air quality condirions, it is possible to reduce the uncontrolled air infiltration