IFC-Industry Foundation Classes
As part of the BIM format IFC is a standardized according to the ISO standard file format 16739
to Exchange and share information between software.
L’objectif est de Remplacer un système d’information fragmenté en une solution-méthode
interopérable autour d’un modèle de données commun.
All participants of the project : Architects, bureaux d’études, maîtres d’ouvrage, companies …
enrich a common model of the project using IFC compatible software, without having to
traduire les données d’un format à un autre. Productivity is improved, the losses and the
data alterations are reduced, including no geometric data
as the cost or the process.
CFD computational fluid dynamics
The digital fluid mechanics (MFN), more often referred to by the term (CFD), consiste à étudier les mouvements d’un fluide, or their effects, by the digital resolution of the equations governing fluid. Chosen based on approximations, qui sont en général le résultat d’un
compromise in terms of needs of physical representation compared to the calculation or modeling resources, les équations résolues peuvent être les équations d’Euler, the Navier-Stokes equations, etc.
For what purpose ?
The CFD can integrate into a BIM method or subject to use totally independent and autonomous. We use CFD said external to analyze the natural effects of the wind on the walls of a building to be constructed or existing : Speed, Pressures, depressions etc.. This allows to optimize natural ventilation of interior spaces taking into account the effects of deviations from natural flow according to close urbanization.
This approach leads to information practices to the architect about the direction of the building and/or the size and number of openings.
We use the so-called internal CFD to develop scenarios of delayering air under large and senior Interior volumes to save energy for heating, to improve the comfort of work. Internal CFD is also used to determine age of air.
STD Simulation thermal dynamics
From a 3D representation of the envelope and the internal structure of the building, The calculation of dynamic thermal simulation of a building is to study on a whole year or a period of at least a few days, in the hourly time step, or a lower time step, the thermal behavior of a building. It is possible to consider only the building, architecture, as if to take into account HVAC and lighting systems.
The calculation incorporates the features of geography and climate of the places, as well as the physical nature of the building materials. He scenarisera the parameters impacting as : internal and external energy inputs, the thermal inertia of the building, the transmission of radiation through the walls, as well as the porosity of the walls at the air and breakdowns...
For what purpose ?
The STD can integrate into a BIM method or subject to use totally independent and autonomous.
These applications are numerous by examples :
– Carry out a review of powers and thermal consumptions or frigoriques realistic,
– Search for possible improvements to the balance of powers and consumption,
– Optimize and streamline regulations and distributions networks: Heating, Refresh, Air conditioning, Ventilation.
– Find the best compromise in the management of external free contributions. (Solar)
– Reduce or cancel the effects of overheating of domestic environments.
– Know natural illumination and appreciate the means to improve.
T.E.C. Enrichment in Capital
This method has other names, She is known in the professional environment of energy under the name of rate of Enrichissent capital. It allows to evaluate the real effectiveness of a given investment, compare this investment with other, taking into account the actual cost of the investment in CMPRC, (weighted average cost of capital resources) the cash flow positive .
"TEC method. (for “Enrichment in Capital”) allows to perform quick and reliable preliminary economic analyses of projects and industrial investment programs, particulièrement dans le domaine de l’énergie et des énergies renouvelables.
Cette méthode est une méthode d’analyse économique et non d’analyse financière, d’où les spécificités suivantes pour son application :
• Analysis of the overall cost-effectiveness of the investments, and not only profitability of committed equity analysis.
• Analysis of profitability before taking into account any subsidies to investment and the operation and maintenance. However, as will be seen, un des avantages de cette méthode est de pouvoir quantifier très simplement l’influence des subventions sur la rentabilité économique des projets ou sur les tarifs de vente du kWh ou des services énergétiques.
• Analysis before taking into account the tax benefits: accelerated depreciation, tax deductions...
• Analyse avant partage de la valeur ajoutée entre l’investisseur et les pouvoirs publics (via notamment l’impôt sur les bénéfices).
To analyze projects are supposed to meet the temporal schema above below :
• Analysis prior to the beginning of the investment decision 0.
• In the case where the investment decision is taken, achievement during the year 0 (expenditure = initial capital investment I).
• Industrial commissioning at the beginning of the year 1, with this year there a production in line with average annual production sold supposed Ea fixed
and valued at a fixed average annual selling TV in constant currency rate.
• Economic observation of n years of operation time..
• Expenses annual operation Dem (excluding costs due to fuel supply) and maintenance-maintenance (including provisions for exceptional maintenance) constants for n years of economic observation.
• Expenses average annual Dc constant fuel supply (Cc fixed cost of fuel and productivity average annual constant).
• Residual value of the facilities at the end of n years of supposed operation equal to the costs of decommissioning and reclamation of the sites.
(Text of M. Bernard CHABOT , methodology 19.12.2002)