Rémi BOUCHIE, CSTB Pierre BOISSON, Simon THEBAULT, CSTB Florent ALZETTO, Saint Gobain Recherche

1. Short methodologies for in-situ assessment of the intrinsic thermal performance of the building envelope Rémi BOUCHIE, CSTB Pierre BOISSON, Simon THEBAULT, CSTB Florent ALZETTO, Saint GobainRecherche Adrien BRUN, CEA PERFORMER project – Funded by the EC under the 7th Framework Programme - Grant Agreement #609154

2. Performer project • Founded by the 7th Framework Program of the European Union (project cost 8,5 M€) • Aims : • To develop a comprehensive energy performance assessment framework for buildings • To develop innovative methodologies • To develop innovative tools (ICT tools, software…) • Major European companies and research centers implicated: • Reducing to gap between expected and actual energy performance of buildings • A part of the gap is determined by intrinsic performance of the building envelope (workmanship quality), a specific task of PERFORMER Project is dedicated to find methods to measure in situ the thermal performance of a constructed envelope. PERFORMER project – Funded by the EC under the 7th Framework Programme - Grant Agreement #609154

3. Need for innovative methods • Methods with occupancy • Energy signature methods : • The “signature” include ventilation • Occupant behaviour (i.e. windows opening) • Solar gains ? Other energy uses (hot water) ? • Methods with no occupancy • Most studied: the co-heating test = “optimised” energy signature method (no occupancy, no ventilation, just heat consumption, method for solar gains…) • Good accuracy but practical problems: • Applicable in cold climate/season (not in summer) • Need about a month with no occupancy in the tested building • Need for innovative methods to reduce time duration for the test, development of “short” measurement methods (< 10 days max) PERFORMER project – Funded by the EC under the 7th Framework Programme - Grant Agreement #609154

4. Isabele method Tested building Tint mes • Optimisation protocol: • Temperature difference minimized by adjusting: • Thermal loss through the envelope (insulation + air infiltration) • Dynamic parameters (energy stored of the thermal mass) • The “best” thermal loss coefficient HLC (W/K) obtained when measured and calculated internal temperature are the closest possible External solicitations (measured) Heating power injected (controlled and measured) ≠ to minimize Tint calc Thermal modeling (RT 2012) PERFORMER project – Funded by the EC under the 7th Framework Programme - Grant Agreement #609154

5. QUB method The simplest building model Objective : Measure the whole building heat loss in one night • Done during the night and without occupancy to avoid non measured additional power P(t) R TEXT TIN C Loss by transmission and infiltration Internal mass storage

6. INCAS platform • 88 m2 two-story individual house • Roller blind closed to avoid radiations • Temperature and energy consumption monitoring • Use of in-house heating and ventilation system • Electrical resistance on terminal part of the airflow network • Limited ventilation losses using heat recovery system on exhausted air PERFORMER project - 7th Framework Programme - Grant Agreement #609154

7. Main results • ISABELE method: • QUB method: • INCAS-IMA house very airtight, few thermal losses by air infiltration (≈ 1 W/K): global measured heat loss very closed to heat loss by thermal transmission alone • Few thermal losses by air infiltration (Hv,inf ≈ 1 W/K) • Global measured heat loss HLC very closed to heat loss by thermal transmission alone: HLC ≈ Htr • Htr has been calculated using existing standards: Htr = 104 W/K • Both methods give similar results, closed to expected value PERFORMER project – Funded by the EC under the 7th Framework Programme - Grant Agreement #609154

8. Discussions • Need for “reference” value… • ISABELE and QUB method are being tested and compared to co-heating test value • Feedback on methods applicability during warmer season (now…) • Feedback from a real building test (on Saint Teilo’s School, during easterholidays) • Is it possible to “deal with” existing in-house heating systems ? • Problem of a real building: counting heat consumption, complex envelope, big volume, non tested zone, solar gains… • Replicable on every buildings types ? • Are you ready to leave your all building empty for several days (minimum) ? Sampling by small zones may be difficult… • Can we imagine on ICT kit to run theses methods on real buildings ? • A key point: heating system: easy to control ? Possible to over-heat the tested building ? Easy to measure heat consumption alone ?... PERFORMER project – Funded by the EC under the 7th Framework Programme - Grant Agreement #609154