PROCEEDINGS OF ONE-DAY SEMINAR - The energy future of existing buildings in Brussels: between preservation and performance - 11/12/14 - (Page 56)
ONLINE
BRUSSELS HERITAGE - ONE-DAY SEMINAR - 11/12/2014
ANALYSIS OF UNCERTAINTIES IN DYNAMIC
THERMAL SIMULATIONS FOR OLD HOUSING:
A CASE STUDY OF ONE APPARTMENT AND ONE
HOUSE IN THE PARIS REGION
JULIEN BORDERON
CENTER FOR EXPERTISE AND ENGINEERING ON RISKS, URBAN AND COUNTRY PLANNING, ENVIRONMENT
AND MOBILITY (CEREMA) - REGIONAL LABORATORY OF STRASBOURG (FRANCE)
THE EXISTING TOOLS FOR EVALUATING BUILDINGS AND THE UNCERTAINTIES
ASSOCIATED WITH THE INPUTS FOR DYNAMIC THERMAL SIMULATIONS ARE
PRESENTED, ALONG WITH A WAY OF EXAMINING THE LIMITATIONS OF MODELS
WHEN APPLIED TO EXISTING BUILDINGS.
This presentation centres on the
method that we have applied to a
certain number of buildings and
that we continue to use. In fact, our
approach has been deemed sufficiently beneficial by the French
Ministry of Ecology, Sustainable
Development and Energy that we
have been asked to go even further. I will illustrate my talk with
studies carried out on an apartment located in a building in the
16th arrondissement of Paris and a
house in the inner suburbs of Paris
(figs. 1 and 2).
THERMAL SIMULATION
APPLIED TO OLD BUILDINGS
Dynamic thermal simulation is one
of the common auditing tools for
buildings and therefore also for old
housing. In fact, to perform a general audit, a number of aspects are
worked on: the health of the building; its functional state; its suita-
bility for purpose; the comfort of
occupants; its strengths and weaknesses; its heritage status and elements that need to be preserved
are evaluated. The energy status
of the building is also addressed
through consumption, thermal
efficiency, performance of systems and management and use. It
is then possible to use simulation
tools, if there is sufficient concern, to compare or test different
packages of solutions. An attempt
is made, via this energy audit, to
determine typical consumption
and how it is broken down by type of
use in order to obtain itemised distribution graphs of heat loss. The
ultimate objective is to establish
priorities. This also enables the
building's behaviour when used in
another way and/or independently
from the occupant's habits to be
simulated. To explain this further:
the energy bills of a person heating
an apartment to 26°C are higher
than those of a person heating
56 | Analysis of uncertainties in dynamic thermal simulations for old housing
the same place to 20°C. Thermal
simulation of a building allows the
consumption specific to an apartment in a classic usage scenario to
be determined. In France, we refer
to the conventional usage scenarios of the thermal regulations. A
reference condition can therefore
be obtained prior to works being
carried out and used to model
different simulations of packages
of work. In order for our simulations to be reliable and be able
to forecast the investment payback period, precise and realistic
data are required. If our target is,
for example, 80 kWh/m²/year
and our initial situation indicates
200 kWh/m²/year, even though
in reality our building is at 150,
the general saving produced by
the works will be a lot less than
expected. It will therefore be
harder to pay off the investment
and could even result in a situation whereby it is not economically
viable. Simulation also facilitates
Table of Contents for the Digital Edition of PROCEEDINGS OF ONE-DAY SEMINAR - The energy future of existing buildings in Brussels: between preservation and performance - 11/12/14
Contents
EDITORIAL
A WORD OF WELCOME
WHAT ARE THE REQUIREMENTS FOR THE ENERGY PERFORMANCE OF BUILDINGS WHEN RENOVATING?
ARCHITECTURAL HERITAGE AND ENERGY PERFORMANCE: COMPATIBILITY CHALLENGES?
URBAN FORMS, TYPOLOGY AND IMPROVING THE ENERGY EFFICIENCY OF OLD BRUSSELS BUILDINGS
THE LISTED HOUSES OF THE LE LOGIS AND FLORÉAL GARDEN CITIES ADAPTATIONS TO CURRENT ENERGY AND COMFORT NEEDS
FINANCIAL IMPACT OF ENERGY EFFICIENCY MEASURES IN LE LOGIS AND FLORÉAL
ANALYSIS OF UNCERTAINTIES IN DYNAMIC THERMAL SIMULATIONS FOR OLD HOUSING: A CASE STUDY OF ONE APPARTMENT AND ONE HOUSE IN THE PARIS REGION
RISK ANALYSIS FOR APPLYING INTERIOR INSULATION IN HISTORICAL BUILDINGS: A CASE STUDY OF THE FORMER VETERINARY SCHOOL IN ANDERLECHT
IEDER ZIJN HUIS: THE RENOVATION OF A MODERNIST SOCIAL HOUSING TOWER BLOCK
HE BRUNFAUT TOWER: PRESENTATION OF THE CONCEPTUAL DESIGN CHALLENGES OF A RENOVATION
PRESENTATION AND RESULTS OF THE “PLAGE” PROJECTS LOCAL ACTION PLANS FOR ENERGY MANAGEMENT
THE BELGIAN BUILDING RESEARCH INSTITUTE: A CONTRIBUTION TO HERITAGE MAINTENANCE EXPLORING THE TRAINING OF HERITAGE ADVISORS SPECIALISING IN ENERGY
SUSTAINABLE RENOVATION OF A BRUSSELS HOUSE: A CHALLENGE FOR BUILDING TRADESMEN
CONCLUSION
COLOPHON
PROCEEDINGS OF ONE-DAY SEMINAR - The energy future of existing buildings in Brussels: between preservation and performance - 11/12/14
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