Engineered Timber Construction Systems for Multi-Storey Residential Buildings with Passive House Standard

Transcription

1 Engineered Timber Construction Systems for Multi-Storey Residential Buildings with Passive House Standard Inger Andresen Tordur Steindur Bryngeirsson > kaden-klingbeil.de Michael Gruner

2 Content Ballastbrygga Mandal Objectives Method Case studies Results Discussion Conclusions 2

3 Ballastbrygga project description residential & retail ca m², 4..5 floors Passive house standard (NS 3700) 3

4 Ballastbrygga Structural system 4

5 Ballastbrygga structural module module 12 x 8 m, 3 alternatives to span exterior walls: non-loadbearing timber framing floor slabs: timber construction 12 m span façade - façade primary structural system: steel (preliminary) 8 m span partition wall partition wall 7+5 m span façade - façade 5

6 Objectives Evaluation of engineered timber construction systems (ETCS) in floor constructions Comparison with respect to embodied emissions Assessment of impact on energy efficiency 6

7 Method Review of the Norwegian and Central-European marked Establishment of performance criteria for preliminary dimensioning Emission accounting (spreadsheet-based) CO2-equivalents for 1 m² heated floor area over total lifetime embodied emissions: database: EMPA Økologische Baustoffliste (cradle-to-gate) only ETCS, flooring assembly, beams and columns operational emissions: simplified energy supply system (heat pump covering 80 % of heating demand) emission factor electricity: 260 g CO2-equiv./kWh (scenario zero emission in 2100) 7

8 Method Energy calculations (Simien 5.015) simplified model of project focus on heating demand and load varying heights of floor assemblies represented in varying façade areas, lengths of thermal bridges minimum requirements on components according to NS 3700 except of normalised thermal bridge value thermal bridges: modelled and calculated in LBNL Therm 6.3 slab edges (100 protrusion into exterior wall), columns, windows (simplified) 8

9 Case studies performance criteria Structural capacities timber structures are dimensioned according to NS-EN 1991 and NS-EN 1995 where serviceability is crucial parameter Norwegian comfort criteria : deflection less than 1.3 due to 1 kn point load and natural frequency not lower than 8 Hz Fire safety fire resistance of floor slabs: R 60 A2-s1,d0 structure withstands entire course of fire, is restorable afterwards Acoustic performance sound insulation class C according to NS 8175 airborne sound insulation level RW 55 db, impact sound insulation level Ln,W 53 db 9

10 prefab concrete Case studies ETCS B massive slab A case name span A hulldekke HD m B hulldekke HD 220 8m C Cross-laminated timber (CLT) D D composite complex elements C G E F Kerto Ripa 7+5 m 8m E Lignatur LFE 8m F Lignotrend Block Q3 8m G brettstapel & HBVSystem 8m 10

11 Case studies ETCS case A case C case G Hulldekke HD 320 Cross-laminated timber Timber-concrete composite assembly: parquet expanded PE levelling concrete HD 320 total height: weight: fire safety: assembly: kg/m² assembly: parquet floorboard (gypsum) particleboard mineral wool + batten 48x98 + green sylomer 45x40x25 Cross-laminated timber total height: 431 weight: fire safety: parquet particleboard acoustic insulation PE-foil reinforced concrete brettstapel total height: kg/m² sprinkler weight: fire safety: 530 kg/m² sprinkler 11

12 Case studies ETCS case D case E case F Kerto Ripa Lignatur LFE Lignotrend Block Q3 assembly: assembly: parquet 2 x floorboard (gypsum) paviours acoustic insulation PE-foil Ripa box-element + rockwoll inlay total height: 489 weight: fire safety: 193 kg/m² sprinkler assembly: parquet 2 x floorboard (gypsum) paviours acoustic insulation PE-foil LFE -element + silence -inlay total height: 419 weight: fire safety: 271 kg/m² sprinkler parquet 14 particleboard 22 acoustic insulation 20 PE-foil 0.2 Block Q3 335 BV -element blown in grit total height: weight: fire safety: kg/m² sprinkler 12

13 Results embodied emissions 13

14 Results embodied emissions 14

15 Results energy demand 15

16 Results embodied + operational emissions 16

17 Discussion Performance criteria greater dimensions despite shorter spans additional measures to improve acoustic performance extra steps to fulfil requirements on fireproof surfaces Energy performance better thermal bridge values little differences with respect to energy demand due to counterbalancing effects 25 % higher installed heating power (dependent on strategy) Emissions no clear advantages for entire assembly (for cradle-to-gate) large portion of emission linked to the additional measures to overcome shortcomings transport relevant for heavy elements and long distances 17

18 Conclusions Further work emission factors for ETCS should be more specific (LCA?!) optimised structural systems with more detail expanded inventories include entire structure and technical systems emissions from transport can be relevant cooling loads and related measures should be included 18

19 Thank you! 19