IBPSA 1997 - Prague, Czech Republic

International Building Simulation Conference 1997, Prague, Czech Republic.

Contains 117 papers.

Guidance on the use of computational fluid dynamics for modelling buoyancy driven flows

Buoyancy driven flows have always been, and still are, difficult to model using CFD programs. Much validation work is required along with guidelines for the CFD practitioner about how to model such flows. This paper makes a contribution to these two areas by considering buoyancy driven displacement ventilation in a very simple geometry. The nature of buoyancy driven displacement ventilation is briefly described and guidance offered on how to represent the problem in a CFD program. Simulations were carried out using two eddy viscosity turbulence models.

Building energy tools directory

A directory of building energy software tools is now available on the web. The directory contains information on more than 100 tools ranging from research software to commercial products with thousands of users. The common thread for all the software is improving energy efficiency or incorporating renewable energy concepts in buildings.

What next for building energy simulation: a glimpse of the future

The U.S. Departments of Energy and Defense (DOE and DOD) are jointly developing EnergyBase, a new building energy simulation tool that builds on the capabilities of BLAST and DOE-2.

Weather sequences for predicting HVAC system behavior in residential units located in climates tropical

The   purpose of our research deals with the description of a methodology for the definition of specific weather sequences and their influence  on the energy needs of HVAC system. We’ll apply the method on the tropical Reunion Island. The  methodological approach based on a detailed analysis of weather sequences leads to a classification  of climatic situations that can be applied to the site. These sequences have been used to simulate  buildings and air handling systems thanks to a thermal simulation code, CODYRUN.

Ventilation and thermal performance of design options for stadium Australia

Stadium Australia is to be the centrepiece of the year 2000 Sydney Olympics. The architects aimed to minimise energy consumption by incorporating passive design measures which would provide ventilation, natural cooling and warming and daylight.

Validation of Hot2000™ using hers bestest

HOT2000™, a residential energy analysis program, is constantly under evolution. New models are added to the program and its user base is ever expanding. As such it is important to continuously validate the program and ensure that it will be useful in its intended markets. To this end, HOT2000™ has been run through the HERS BESTEST, a comparative testing method against other detailed simulation programs. This report outlines the cases modeled and the assumptions which were made.

Validation of displacement ventilation simplified models

Optimization and control of displacement ventilation systems in buildings require accurate modeling of aeraulic and thermal phenomena involved in the establishment or the destruction of thermal stratification in the room. We carried out an analysis and developed global models on the basis of data from the Poitiers "Laboratoire d’Etudes Thermiques" experimental facility (see Figure°2).

Validation of a building thermal model in Clim2000 simulation software using full-scale experimental data, sensitivity analysis and uncertainty analysis

Within the framework of full-scale experimental validation of the global building energy simulation software programme CLIM2000, an experimentation has been carried out in a 100 m² real house from Oct 95 to May 96. First, we compare the simulated results with the experimental results. Then, we applied two different screening methods (sensitivity analysis) to the model in order to exhibit the most influent parameters and to calculate the output confidence interval (uncertainty analysis), and to compare the pertinence of each method in terms of results precision and calculation time.

TRNSYS 14 goes windows and window 4.1/1/ : tool for energetic and visual building simulation

New developments of both user-friendly interfaces and mathematical models have been added to the very known software package TRNSYS /2/, a transient system simulation program, during the last year. They respond to the growing application of this building and system simulation software for low energy building design by over 200 consulting companies in Germany

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