In other cases, the new tools address a specific design problem, e.g., natural ventilation. In some cases, these development efforts provide integration between existing tools to address a general category of phenomenological interaction, e.g., airflow and heat transfer. Recently, NIST has enhanced existing tools and developed new tools to address the interaction between building airflow, heat transfer and contaminant transport. NIST develops and applies simulation tools that address IAQ and ventilation of the built environment and the interaction between these and other building characteristics, e.g., energy use. This paper presents two practical case studies using the coupled modelling tool to evaluate IAQ performance of a CO 2-based demand-controlled ventilation system under different levels of building envelope airtightness and the design and analysis of a natural ventilation system.ĭesign and analysis of building systems involves a wide range of disciplines and tools to address the many aspects of building performance including energy use, indoor air quality (IAQ), lighting, etc.
#Trnsys google sketchup software#
While CONTAM has been used to address design and performance of buildings implementing energy conserving ventilation systems, e.g., natural and hybrid, this new coupled simulation capability will enable users to apply the tool to couple CONTAM with existing energy analysis software to address the interaction between indoor air quality considerations and energy conservation measures in building design and analysis.
It has been widely used to design and analyse smoke management systems and evaluate building performance in response to chemical, biological and radiological events. These simulations address the interaction between whole-building energy, airflow and contaminant transport in evaluating various ventilation strategies including natural and demand-controlled ventilation.ĬONTAM has been in practical use for many years allowing building designers, as well as IAQ and ventilation system analysts, to simulate the complex interactions between building physical layout and HVAC system configuration in determining building airflow and contaminant transport. This paper provides an overview of these new capabilities and applies them to simulating a medium-size office building.
#Trnsys google sketchup full#
In order to better address these interdependencies, the National Institute of Standards and Technology (NIST) has developed an updated version of the multi-zone airflow and contaminant transport modelling tool, CONTAM, along with a set of utilities to enable coupling of the full CONTAM model with the TRNSYS simulation tool in a more seamless manner and with additional capabilities that were previously not available. One example of such interdependence is the interaction between heat transfer, inter-zone airflow and indoor contaminant transport. Often these tools operate in isolation from one another, making it difficult to evaluate the interactions between related phenomena and interacting systems, forcing oversimplified assumptions to be made about various phenomena that could otherwise be addressed directly with another tool. Building energy analysis tools are available in many forms that provide the ability to address a broad spectrum of energy-related issues in various combinations.
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