Comparison of three IAQ calculation methods

Calculating contaminant concentrations in or the required ventilation for a space has been a difficult and confusing part in the application of the IAQ Procedure of ANSI/ASHRAE Standard 62.1-2004; Ventilation for Acceptable Indoor Air Quality. Appendix D of ASRAE Standard 62 presents one method for performing these calculations, but it is limited to the steady-state analysis of a single zone. More recently, two software tools have been developed by the United States National Institute of Standards and Technology (NIST) to facilitate these calculations and to include transient effects.

Effect of telecommuting on energy consumption in residential and non-residential sectors

In this paper, the change of energy use by telecommuting (working at home) is simulated for  residential and office buildings by modeling the  differences in the occupants’ behavior. By summing  up these results, the change in annual energy use in  Osaka City caused by the saturation of  telecommuting is evaluated in three dissemination  scenarios for the transformation of office buildings.

Benefits of BIM in the thermal performance management

The importance of analysing thermal performance in building design has grown, but it is still often done using simple static calculations or estimates. Accurate dynamic thermal simulation software have been available already for decades, but these tools are still not widely used by practitioners in building projects. The main barrier of wider usage of dynamic thermal analysis methods has been the required big manual input work. By utilising BIM as a data source for hermal analysis, the data input will be more efficient and the existing data more reusable.

Development of new facades by combined modeling of thermal sound and ventilation aspects at early design phases

Facades must meet with continuously increasing requirements concerning design quality and technical performance. It will be shown that neither extremely simplifying nor highly detailed simulation tools with complete geometrical representation really help to develop new facade types during the early stages of design. Due to simplified physical modelling, conceptual variations may not be adequately represented and this means that different properties cannot be seen.

The powerdomus environment for simulating HVAC systems

In this paper, the new capabilities of PowerDomus to simulate central HVAC systems combined to its whole-building hygrothermal model is presented. First, models for the primary (chiller, cooling tower, primary pumps and condensation pumps) and secondary (cooling and dehumidifying coil, humidifier, fan and mixing box) systems are presented. Those mathematical models have been integrated into the whole-building PowerDomus program.

A simulation of daylight levels for the determination of visual comfort in large spaces

In sizable environments, such as the collective areas of a big university building, characterised by very long corridors, large hallways and broad glazed surfaces, the daytime illumination factor is often only excellent near to the latter, due to their predominantly horizontal, rather than vertical, nature. His study, which has been carried out thanks to a simulation software, shows the results of a correlation between light contributions, come out from the wide glass surface and those of a big skylight which cross lenghtways the main part of the building. Such results have been compared wi

Impact of the US national building information model standard (NBIMS) on building energy performance simulation

The U.S. National Institute for Building Sciences (NIBS) started the development of the National Building Information Model Standard (NBIMS). Its goal is to define standard sets of data required to describe any given building in necessary detail so that any given AECO industry discipline application can find needed data at any point in the building lifecycle.

The building controls virtual test bed – a simulation environment for developing and testing control algorithms, strategies and systems

The paper describes the design of a Building Controls Virtual Test Bed (BCVTB), a simulation environment for the development of control algorithms and strategies for the major energy systems in buildings, HVAC, lighting, active facades and on-site generation. The BCVTB is based on the whole building energy simulation program EnergyPlus and includes both the pure simulation and the hardware-in-the-loop methods of implementing the controls.

Using simulation software calibration tests as a consumer guide – a feasibility study using lighting simulation software

This project investigated the feasibility of using existing software test cases to provide reliability scores for lighting simulation software. Estimation of lighting levels is a key element in commercial building design. And, many lighting programs claim to render light accurately. However, there is little published information on their accuracy. In thermal simulation, the IEA BESTEST (Judkoff et al), recently adopted by ASHRAE as Standard 140 (ASHRAE 140), certifies the acceptability of a thermal simulation code. (e.g.

BUILDING SIMULATION 2007: The Study on the Simple HVAC Interface of EnergyPlus in Chinese

EnergyPlus is a new building energy simulation program supported by American DOE. Based on the most popular features and capabilities of BLAST and DOE-2, it is rimarily a simulation engine without good interface. There’s an original interface called IDF editor supported by EnergyPlus, and users must input the simulation data with complex lists while using it. The boring inputting and all-English interface make the energy simulation so inconvenience that keep lots of new users away from the software although it has a precise and steady engine, especially the local users in China.

Pages