IBPSA1999

Eight  mechanically  ventilated  flow  patterns  have been conducted in a test chamber. The air age in test chamber is measured with tracer gas technique. A CFD program named as STACH-3 is developed with the transport equation of air age in it. The predicted air age with STACH-3 is compared with the experimental results. It is shown that the computed air age agrees well with the experimental results except a few points. The relationship between flow pattern and air age distribution for the test chamber is analyzed  with  not  only the predicted  but  also the experimental results.

This  paper   describes   the   methodology  and   the implementation of DEST, which is a simulation software developed to help the designer during design process. For each design phase, DEST provides corresponding method and program. Some new ideas about using simulation in design are introduced in the paper, with some examples that come from real projects. It is believed that the HVAC design should shift from single-point-design to whole process design in the new century. To achieve this goal, simulation plays an important role.

For improving feedback about thermal simulation results from engineers to architects, it is desirable to present them in the three-dimensional context of the building. In this paper, we present a system for improved thermal simulation and interactive 3D visualisation of the results. We describe extensions of the physically-based  rendering  system GENESIS-2 towards

Many recent, moisture-originated failures in  low-rise residential and  high-rise residential/commercial buildings have put a significant pressure to change construction codes in North America and Europe. However, solutions to moisture induced problems may be difficult when several interacting mechanisms of moisture transport are present. Recently, a new approach to building envelope durability assessment has been introduced in North America.

One central idea of building simulation is to visualize calculated datavalues embedded in an in herently three dimensional building shape. Here we present the interactive extensible program rshow which provides a compact and expansible interface for displaying scalar data in a D visu alization  Design implementation and examples are discussed 

In the framework of a collaboration between EDF and CSTB, we carried out a specific experimental protocol in Bouin house (CSTB site, house completely dedicated for infiltration and air change measurement) with different configurations to study the wind fluctuations. These experimental data are used to validate the pressure elementary models available into CLIM2000 software and especially the infiltration models. The agreement between experimental data and simulated results is acceptable taking into account the difficulty of this kind of experiment.

Interoperability among software tools that are used in building design can make the use of building energy simulation tools more frequent and more effective. Industry Foundation Classes (IFC) are an object- oriented data model of  buildings that provides an environment for such interoperability.

Hourly simulation programs such as DOE-2, HAP and BLAST can effectively simulate the performance of HVAC systems in response to seasonal weather patterns. However, the schedules of use for key internal loads are often given insufficient consideration, leading to a reduction in accuracy. Schedules are often overly simplified and based on insufficient information about how a building is used.

In  this  paper,  we  describe  the  characteristics  of “Luminous Planner” as a general-purpose lighting design tool, and of “LSR(Lighting Simulation Radiosity)”, which is capable of high-precision lighting simulation by taking space reflection into consideration. The “LSR” divides architectural shapes into small polygons and pursues flux transfer in each small polygon. We applied the progressive refinement approach to the “LSR”, required calculation time and memory have been reduced.

IDA Indoor Climate and Energy is a recently developed tool for building performance modelling and simulation. It represents a new generation of BPM software in several ways. (1) It is entirely imple- mented in a general-purpose simulation environment, IDA. (2) All models are available as NMF source code. (3) It covers a range of advanced phenomena such as integrated airflow and thermal models, CO2 modelling, and vertical temperature gradients. (4) It has a multi-level GUI to accommodate different types of users.