Short methodologies for in-situ assessment of the intrinsic thermal

Report
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 Gobain Recherche
Adrien BRUN, CEA
PERFORMER project – Funded by the EC under the 7th Framework Programme - Grant Agreement #609154
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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
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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
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ISABELE METHOD
Tested building
■ Optimisation protocol:
Tint mes
External solicitations
(measured)
Heating power injected
(controlled and measured)
≠ to minimize
Tint calc
Thermal modeling (RT 2012)
■ 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
PERFORMER project – Funded by the EC under the 7th Framework Programme - Grant Agreement #609154
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QUB METHOD
Objective : Measure the whole building
heat loss in one night
The simplest
building model
P(t)
R
TEXT
TIN
C
 = 0  − 
Loss by
transmission
and infiltration
∆
+
∆
Internal
mass
storage
■ Done during the night and without occupancy to avoid non measured additional
power
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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
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MAIN RESULTS
■ ISABELE method:
Test method
■ QUB method:
ISABELE
QUB
Heat Loss
Coefficient
HLC [W/K]
112
99
■ 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
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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 easter holidays)
■ 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
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