IBPSA 2003 - Eindhoven, Netherlands

International Building Simulation Conference 2003, Eindhoven, Netherlands.

Contains 190 papers.

Windbreak sheltering effects on outdoor open space

This paper presents a study of windbreak sheltering effect on the outdoor open space using Computational Fluid Dynamics (CFD) techniques and the wind tunnel experiments carried out for validating the CFD models. Although the influence of a windbreak on the reduction of wind speed is fairly well known, it is still uncertain how this influence will be affected by the buildings in an urban area where the windbreaks are placed for providing better wind comfort to the people in outdoor open space.

Will equation-based building simulation make it? experiences from the introduction of ida indoor climate and energy

In building simulation, as in several other domains, traditional monolithic simulation codes are still in dominance over simulators based on symbolic equations in a general modeling language. Introduced in 1998, IDA Indoor Climate and Energy has become the first widely spread thermal building performance simulator based on the new technology. Developing a full-fledged dynamic whole-building simulation pro- gram is a formidable endeavor in any  setting  and since the first beta version in 1997 a number of les- sons have been learned.

Whole building energy simulation with complex external shading devices

In this paper an approach for pre-calculating building façade incident irradiance levels under a typical, yet computationally complex, external shading device with state-of-the-art ray tracing simulation techniques is presented. The impact of accurate modelling of direct solar, diffuse sky and inter-reflected irradiance components on resulting levels of thermal comfort and energy demand is analysed and recommendations are given for improvement of modelling capabilities.

 

Visualisation of building models

In  an  existing  integrated  building  design  tool, BSim2002, a 3D building model can be created. The model can be used for thermal simulation, but also for other purposes, e.g. for calculation and visualisa- tion of the solar penetration into a building. The model can be exported to other programs, e.g. for daylight calculations and visualisation.

Ventilation calculation by network model inducing bi-directional flows in openings

For the multi-room ventilation calculations, bi- directional flows or counter flows in openings have been rarely taken into consideration and only uni-directional flows have been allowed for the calculation.

Validation of the use of Australian input-output data for building embodied energy simulation

Traditionally, the simulation of buildings has focused on operational energy consumption in an attempt to determine the potential  for energy savings. Whilst operational energy of Australian buildings accounts for around 20% of total energy consumption nationally, embodied energy represents 20 to 50 times the annual operational energy of most Australian buildings. Lower values have been shown through a number of studies that have analysed the embodied energy of buildings and their products, however these have now shown to be incomplete in system boundary.

Validation of CONTAMW predictions for tracer gas in a townhouse

To   provide   additional   validation   data   for   the multizone airflow and contaminant model, CONTAMW, experiments were performed in an occupied 3-story townhouse in Reston, VA. A tracer gas, sulfur hexaflouride (SF6), was manually injected within one room of the house and the concentration of SF6 was measured in each zone. This same process was then recreated in CONTAMW and the resulting predictions were statistically compared to the measured values. A total of 10 experiments were conducted and simulated between May 2000 and June 2001.

Using whole building simulation models and optimizing procedures to optimize building envelope design with respect to energy consumption and indoor enviroment

Even though simulation is being increasingly used in design of modern buildings, the full potential of simulation is usually not achieved. To improve building and HVAC system performance, designers usually guess different values of design parameters and then redo the simulation without actual knowing if the guessed value will lead to improvement. This is inefficient and labor intensive. In addition, if the number of design parameters being varied exceeds two or three, the designer can be overwhelmed in trying to understand the nonlinear interactions of the parameters.

Using simulation to move from daylighting issues to first use of the new UK carbon emissions calculation method

The  introduction  of  simulation  into  medium-scale building services and engineering firms can provide design teams with access to new information about the performance implications of design decisions. This new information can disrupt "business as usual" and lead to radical changes in how design teams approach projects and in the resulting design. This paper reports on the experiences of consulting firm Rybka Scotland and the Scottish Energy Systems Group in the redevelopment of a historic structure.

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