The inherent comfort properties of wood

Transcription

1 The inherent comfort properties of wood Kristine Nore PhD Building materials and technology Norwegian institute of Wood Technology Helsinki, November 30 th, 2017

2 Comfort can wood contribute? Visible properties - comfort? Indoor air quality? Hygrothermal properties Sauna physics U-value Campus Evenstad

3 Natural building material Burnard et al 2016:

4 Why do we like wood? Female, Austria, Expert: I can cite a professor of mine from earlier days: Wood is warm, concrete is cold. I still have this in mind. Wood creates warm feelings and is used where these feelings have to be created. wood2new.org

5 Hospital experiment wood in recovery room Experiment in new hospital in Norway Four designs 210 deltakere All rooms are rated good Measured pain and stress and recovery period Kontroll (litografi) Bjørk Bilde (landskap) Eik Nyrud et al. 2017

6 Hospital experiment results Pain Oak Control Stress Art picture Birch

7 7

8 Kontio laft The breathing of Kontio logs ensures that the indoor air humidity remains within the optimal range for human health 8

9 Labratory experiment relative humidity 20% 90 % width hight thickness = mm 3

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11 Hygrothermal mass Thermal mass

12 Wood store heat as moisture? Strandparken Sundbyberg, Stockholm Calculated 75 kwh/m 2 /year Real use 49 kwh/m 2 /year 2017 Moisture is TROUBLE in building physics Folkhem, 2013

13 New term Thermal mass Hygrothermal mass Material Thermally heavy Hygroscopic + Energy reservoir in rooms with Depends on the ability to: Heat storage capacity Transport and store heat Conduct heat Moisture storage capacity Transport and store moisture Emit sorption heat Fit with the diurnal temperature variations Fit with the diurnal climate variations

14 Hygrothermal mass a natural heat pump 14

15 Depth Hameury & Sterley (2006) Magnetic resonance imaging of moisture distribution in Pinus sylvestris L. exposed to daily indoor relative humidity fluctuations. Wood Material Science & Engineering

16 Sauna? Why do we feel an intensive temperature rise when water is poured? Hotel Napura Art & Design, Bolzano, Italy

17 Thermography surface temperature Temperature and relative humidity Surface moisture content

18 THERMOGRAPHY 62 C 65 C 18

19 Sauna results (planed) 19

20 Kiwi Fjeldset Air temperature Surface temperature Relative humidity Weigth change In addition to standard ventilation parametres and CO 2

21 Weight of wood samles Relative humidity Surface temperature wood Summer 2016, June 16th 30th Autumn 2016, Oct. 17th 31st Winter 2017, Jan. 23rd- Feb. 6th

22 Moholt Two floor treated and two floors untreated are measured 22

23 Temperature ( C) Precipitation (mm) Wind (m/s)

24 U-value is this really equivalent? Gypsum mineral wool Wood only 30 mm 100 mm

25 Borg harbor storage ~ m 2 not insulated Walls in office part 250 mm wood U-value = 0.44 W/m 2 K U-value eff = 0.27 W/m 2 K 25

26 Need for research How to exploit hygrotermal mass? How to combine with ventilation Influence of surface treatment Gullhaug torg, Nydalen 26

27 Thank you! Wood is a traditional material providing a cultural heritage to humanity but at the same time, it is capable of huge flexibility when used intelligently and wisely to serve our modern society. Hameury (2006) Spør i vei: kristine.nore@splitkon.no Urnes stavkirke

28 Hygrotermal mass Tre absorbs and holds heat in the form of moisture, like an energy reservoir. Nore, K.; Nyrud, A.Q.; Kraniotis, D.; Skulberg, K.R.; Englund, F.; Aurlien, T. (2017). Moisture buffering, energy potential and VOC emissions of wood exposed to indoor environments. Science and Technology for Built Environment 23:3, Kraniotis, D., Nore, K. (2017). Latent Heat Phenomena In Buildings and Potential Integration Into Energy Balance. Procedia Environmental Sciences, 2017, 38, Kraniotis, D.; Nore, K.; Brückner, C.; Nyrud, A.Q. (2016). Thermography measurements and latent heat documentation of Norwegian spruce (picea abies) exposed to dynamic indoor climate. Journal of Wood Science 2016, 62, Nore, K.; Kraniotis, D.; Brückner, C. (2015). The principles of sauna physics. Energy Procedia 2015, 78, Prekestolhytta