Pedro Dilkin - dilkin@main.unijui.tche.br;
Universidade Regional do Noroeste do Estado do Rio Grande do Sul, Departamento. de
Física, Estatística e Matemática
98700-000 - Ijuí, RS, Brasil
Paulo Smith Schneider - pss@mecanica.ufrgs.br
Universidade Federal do Rio Grande do Sul, Engenharia Mecânica
Cx. P. 17819 - 90035-972 - Porto Alegre, RS, Brasil

This work presents a critical analysis of national proposals of standarts for the thermal performance of simple residential buildings. A review of some international standarts is performed together with the description of the national proposals of standarts, and a prototype of a house is assembled, following each one of the texts. Results are displayed and the prototypes are simulated using the TRNSYS environment, concernning winter and summer periods of Porto Alegre. Finally, the national proposal that achived the best performance is improved by means new simulations.

Keyword: Thermal behavior of buildings, Standards, Thermal Simulation, Social pourpose Buildings
 
 

Anca Gh. Duta - duta@insa-cethil-etb.insa-lyon.fr
CETHIL/ETB, UPRES A CNRS 500
20 av. Albert Einstein, bât. 307, 69621 VILLEURBANNE CEDEX, FRANCE

Jean-Jacques P. Roux - roux@insa-cethil-etb.insa-lyon.fr
Jean X. Noël - codyba@insa-cethil-etb.insa-lyon.fr
Freelance Engineer, 15 place Carnot 69002 LYON, France

In CODYBA software new version, a building model is based on its decomposition in elementary objects (air volumes, walls, windows, control systems, etc). The global building model is obtained by the connection of these different "objects/models", associated to excitations like the exterior climate and/or the internal loads. These excitations are also manipulated as "objects/models". To summarize, the CODYBA's graphical user interface introduces concepts that are identical to those manipulated in everyday practice by building professionals (walls, windows, materials, regulators, etc) and reproduced on screen by a classic "icono-graphical" representation in the "Windows" environment.

Keywords. Thermal system, Energetic conception, Design tool, Objects/models building Decomposition
 
 

Nathan Mendes - nmendes@ccet.pucpr.br
Gustavo H.C. Oliveira - oliv@ ccet.pucpr.br
Humberto X. de Araújo - araujo@ ccet.pucpr.br
Pontifícia Universidade Católica do Paraná (PUCPR/CCET),
Laboratórios de Sistemas Térmicos (LST) e de Automação e Sistemas (LAS)
Rua Imaculada Conceição, 1155
Curitiba-PR, 80.215-901, Brasil

We describe a mathematical model applied to both building thermal analysis and control systems design. We use a lumped approach to model the room air temperature and a multi-layer model for the building envelope. The capacitance model allows to study the transient analysis of room air temperature when it is submitted to sinusoidal variation of external air temperature, representing a case study for the city of Curitiba-PR, Brazil. To evaluate the building performance with thermal parameters, we use MATLAB/SIMULINK. In the results section, we show the influences of thermal capacitance on the building air temperature and energy consumption and the advantages of using MATLAB/SIMULINK in building thermal and energy  analysis as well.

Keywords: Thermal building behavior, Building simulation, MATLAB/SIMULINK, Thermal Control
 
 

Christophe Ménézo - menezo@insa-cethil-etb.insa-lyon.fr
CETHIL/Equipe Thermique du Bâtiment UMR CNRS 5008
INSA de Lyon - Bât. 307 - 20 Av. A. Einstein 69621 Villeurbanne Cedex - France

Hassan Bouia - bouia@insa-cethil-etb.insa-lyon.fr
Jean-Jacques Roux - roux@insa-cethil-etb.insa-lyon.fr
Patrick Depecker - depecker@insa-cethil-etb.insa-lyon.fr
 
This work is devoted to the field of building physics and related to the reduction of heat conduction models. The aim is to enlarge the model libraries of heat and mass transfer codes through limiting the considerable dimensions reached by the numerical systems during the modelling process of a multizone building. We show that the balanced realization technique, specifically adapted to the coupling of reduced order models with the other thermal phenomena, turns out to be very efficient.

Keywords: Building Physics, System Reduction, Balanced realization, Experimental test.
 
 

Arlindo Tribess - atribess@usp.br
Flávio Augusto Sanzogo Fiorelli - fiorelli@usp.br
Alberto Hernandez Neto - ahneto@usp.br
Escola Politécnica da USP - Departamento de Engenharia Mecânica
Av. Prof. Mello Moraes, 2231 - CEP: 05508-900 - São Paulo - SP - Brazil

In a building project, several subsystems are designed, among them the air conditioning system. Electrical energy consumption profiles show that this subsystem is responsible for 40 to 50% of total consumption in a commercial building. Besides the study of technical aspects that should be considered in order to assure the thermal comfort of the occupants as well the temperature and humidity conditions for an efficient equipment operation, an economical evaluation of this subsystem should be also made. In retrofit projects, the economical aspect is also critical for such projects in order to assure bigg er efficiency in an economically attractive way. This paper analyses some strategies that might be adopted in retrofitting an air conditioning system installed in a commercial building with mixed occupation. By mixed we mean that some floors have a typical office occupation profile and other floors are mainly occupied by electronic equipment. This analysis includes both technical and economical evaluation. The proposed solutions performance are compared to the old system, which allows to verify the retrofitting impact in energy consumption reduction and its economical feasibility.

Keywords: Air Conditioning, Refrigeration, Energy Analysis