Sound predictions based on the wave theory were carried out on HVAC duct networks. This requires the driving wave pressure amplitude and the characteristic reflection factor for every port of every component, and the complex coherence of the driving wave pressure and the characteristic transmission factor between every two of the ports of every component. Determination techniques of these acoustic properties in the presence of airflow, and an acoustical assembly procedure of the component acoustic properties in a large-scale duct network are newly developed.
A two-dimensional numerical simulation of airflow around bluff bodies is presented in this study. The two turbulence models, i.e., standard k-e model and RNG k-e model, are employed to predict the flowfield and wind effects on bluff bodies. The results of the study highlight and compare the discrepancies between these two turbulence models in capturing the flow structure around bluff bodies, particularly in the vicinity of surfaces.
Calibration with actual data has been considered as one of the most important and difficult part for the systematic energy audit procedure. The purpose of this paper is to develop a systematic method, "base load analysis approach" to calibrate the building energy performance model with actual monthly data. The calibration procedure has been visualized as a logical flow chart and demonstrated with 26-stories actual commercial building located in Seoul.
This paper presents the preliminary modelling perspectives of an ongoing project where a exible simulation tool for component and system analysis of district heating consumer installations is developed. The simulation tool makes it possible to simulate district heating consumer installations containing water based central heating systems,domestic hot tap water systems, buildings as well as load predictions of the systems.
This paper presents a decision support system (DSS), named Building Energy Code Advisor, that aims to: (i) check if the early design of the exterior envelope complies with Model National Energy Code of Canada for Buildings (MNECCB) [1] requirements, (ii) provide technical advice on how to improve the design according to the code, and (iii) be a learning
In order to provide an integrated building design system that easily can be adapted by building designers, the Danish Building Research Institute has developed such system. It is based on experience gained as participant in the European COMBINE projects and from development of building energy simulation tools. The intention is that a number of computer tools for building design and analyses shares information about the buildings that they analyse, and that data for the building geometry can be provided by a CAD system.
Simulation tools are not yet used as much and as well as they should all along building life cycle ( BLC ). Most important decisions are still taken almost without using these tools. The work done in the frame of IEABCS Annex 30 consisted in identifying and eliminating as much as possible the main bottle necks encountered in the use of simulation tools.
This paper concerns reasons - and solutions – for the time lag in the uptake and use of building simulation in the Czech Republic relative to many other countries. Following a brief introduction, several barriers to the use of simulation are identified. Barriers can be classified as cultural, economical or technical but there are many interactions. The paper then concentrates on recent work and activities, which aim to reduce these barriers.
The premise underlying this work is that introducing uncertainty considerations into simulation will facilitate risk assessment and that this, in turn, will help to improve designer confidence in simulation. Sources of uncertainty abound in building simulation and must be factored into the solution process. These sources have been identified and useful techniques for quantifying the effects of uncertainties are presented. Two approaches are described: the use of traditional statistical methods, and the use of alternative arithmetical methods.
Typical Meteorological Years obtained from observed meteorological records have become the de facto data source when evaluating thermal performance of buildings. However, this data source has various drawbacks, and alternative TMY assembling methods based on statistical and stochastic models seem to have been perfected to a point where they become sound alternatives. Numerical simulations of test cells were performed for a mid-latitude temperate climate, Lisbon.
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