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ABSTRACT
Thermal Regulation 2012 (RT 2012) is a French regulation intended to limit the financial and environmental impact of energy consumption by newly constructed buildings through a number of constraints. Among these, several specified values of energy efficiency are set as ceilings. The calculation of these values uses a regulatory method called Th-BCE. This method itself, in its dynamical thermal behavior study, uses the RC (resistor-capacitor) scheme, by analogy with electrical calculations. This article explains this RC scheme and its mathematical solution.
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Read the articleAUTHORS
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Bruno SLAMA: Manager of BBS Slama - Alumnus of the École Normale Supérieure de Saint-Cloud. Doctorate in mathematics.
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Lise SLAMA: Manager of BBS Slama - Mathematics and modeling engineer – Polytech (Clermont-Ferrand). Doctorate in computer science.
INTRODUCTION
Successive French thermal regulations, from RT 88 to the current RT 2012, have seen a steady increase in the energy consumption requirements for new buildings. This increase in requirements is naturally accompanied by an increase in the complexity of the calculations needed to assess them.
The sheer scale of the calculations, and the resulting multiplication of parameters and input data, make it difficult to take an intuitive, or even physical, approach to improving energy efficiency in the regulatory sense. This is why a good understanding of the intricacies of the calculations carried out can pave the way for further optimization of the regulatory study.
The general RT 2012 calculation process (see article
The aim of this article is to explain this modeling method, detail the calculations involved and propose a mathematical solution.
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KEYWORDS
modelling | RC method
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RT 2012 – Using the RC diagram to study the thermal behavior of a unit
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Bibliography
Also in our database
Standards and norms
- ISO Thermal performance of buildings – Calculation of energy requirements for space heating and cooling. - ISO 13790 :2008 ISO - 2008
- ISO Building energy performance – Dynamic heat balance calculation in a building or building zone – Part 1: General calculation procedure. - ISO 52017-1 ISO - 2015
Regulations
Décret n° 2010-1269 du 26 octobre 2010 relatif aux caractéristiques thermiques et à la performance énergétique des constructions JO n° 0250 du 27 octobre 2010, page 19250, texte n° 2 – NOR : DEVU1020041D.
Arrêté du 26 octobre 2010 relatif aux caractéristiques thermiques et aux exigences de performance énergétique des bâtiments nouveaux et des parties nouvelles de bâtiments JO n° 0250 du 27 octobre...
Websites
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Energy savings in buildings (Ademe, and Ministère de l'Écologie, du développement durable et de l'énergie). Information on all regulatory measures to improve the energy performance of buildings.
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French Ministry of Ecology, Sustainable Development...
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