tabs (thermally active building systems)2017 herman teirlinck building brussel 62,000 m²...
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TABS (THERMALLY ACTIVE BUILDING SYSTEMS)
Prof Wim BoydensCSTO boydens engineering / visiting professor Ghent university
Feedback from research driven practice27 september 2017
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What is TABS?
TABS = thermally activated building systemCCA = Concrete Core Activation
– Concrete floors/ceilings of a building are activated byembedding water tubes in the concrete and forcingwarm/cold water through the tubes
– High temperature cooling (> 15°C) and low temperature heating (< 35°C)
– Surface temperature very close to room temperature– More than 50% of heat transfer by radiation
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What is TABS?
Prefab woven pipe modules
On site ‘weaving’ Prefabricated slab
Pressure control on site Between hollow airdeck floors Close up
Practical integration
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What is TABS?System integration
In GEOTABS concept (source Rehva 2013) with GSHPAs part of a hybrid emission system
As part of a hybrid GEOTABS concept
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What is TABS?
TABS = thermally activated building systemCCA = Concrete Core Activation
– Thermal capacity of concrete presents storage capacity (thermal inertia, large time constant)
– Difficult to control since heat/cold transfer tobuilding rooms is governed by ΔT
– Self regulating effects
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Why?
STRENGTHS• Water supply temperatures: • < 35°C for heating• > 15°C for cooling• Exploiting environmental energy: (ground coupled) HP, direct
cooling, night cooling• Thermal energy storage thanks to large thermal capacity: shift TABS
operation to periods when heat/cold production is most energy or cost efficient
• Increased thermal comfort by radiation heat exchange• Reduced building height compared to buildings with full air-
conditioning• No visible installations in the room, no chimney
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Why hesitate?
WEAKNESSES• Limited average thermal power output of 40-50 W/m2
• Allow temperature drifts within the specified comfort range or provide an additional fast reacting system
• Limited individual room control• Not useful to change set-point during a day• Acoustic comfort – limited suspended ceiling• Drilling in the ceilings should be carried out with care
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Torhout city administration ( G Debruyne architecten)
integrated absorber (Uponor)
Acoustical solutions
group Van Roey HQ ( arch R Schellen)
Herman Teirlinck building ( Neutelings-Riedijk)
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Looking forward
• OPPORTUNITIES• Suitable for low-energy, passive or zero-energy buildings• Increased share of efficiently generated heat and cold• Less energy and more energy efficient form of cooling than air-
conditioning• Thermal energy storage – increase in flexibility of energy system –
decouples heat/cold production and heat/cold emission
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Looking forward
TABS points of attention Careful incorporation in overall building design Adaption in building’s operation Integration with other systems
INTEGRATED DESIGN PROCESS:Feasibility study
Pre-designDetailed design
Need for assistance by dynamic simulations in the design andcommissioning phase to assess the predicted performance andbehaviour
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2006-… offices, steeply growing
Projects in practice?
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2015- …
2017 Provant Antwerpen 25,000 m² (XDGA architecten – provincie Antwerpen)
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Xavier Degeyter Architects
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2017 Herman Teirlinck building Brussel 62,000 m² (Neutelings-Riedijk architecten – Vlaamse overheid)
2015-
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2006-… health care buildings
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Resultsfirst year of operation group Van Roey, nZEB building
-cooling: 17.5 kwh/m²
- heating: 27.6 kwh/m²
- Installed HP-power 26 W/m²
- energycost year 1: 1€/m²
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2012 Solarwind Windhof (Progroup-Schulerimmo-Pavlowski-Boydens luxembourg)
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Results
Solarwind (Darius Pawlowski)
nZEB 3 years in operation: SolarwindBuilding
- cooling: 17.3 kwh/m²
- heating: 23.4 kwh/m²
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Focus on offices
2010-2012
practice oriented research pathTowards hybrid supply supported by optimal control (MPC )
2012-2017
2016-2020Low grade energy sources upgraded by the low exergy systems in the hybridMPC GEOTABS project proposal ( Devliegher, Boydens, Laverge, Helsen)
Different building types
Designintegrationand predictive control