CONTAMCommittee On Nationwide Television Audience Measurement
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Figure 6 shows comparisons between COSMO and CONTAM for selected results when the COSMO-predicted temperatures are used for the stairwell and the elevator shafts in the CONTAM simulation.
A multizone model, such as CONTAM, calculates airflow and contaminant distributions between the zones of a building and between the building and its outdoors.
A specially developed version of CONTAM called the Project Creation Wizard (PCW) has been developed by Vandemusser (2007) which runs on the same simulation engine but differs from CONTAM in that it has a more "user friendly" graphical user interface and more built-in default model parameters that help reduce the time and effort needed to develop an airflow model.
This study has coupled CONTAM and CFD0 programs by applying CFD0 to the zones where the multizone assumptions fail and applying CONTAM to the remaining zones.
The investigation employs a simplified version of the CONTAM model of a barracks used by Firrantello et al.
Once this minimum flow has been established, CONTAM or another network model can be used to design a system of stair supply and venting that will result in the minimum flow past all stair doors under conditions of all stair doors closed and a design number of stair doors open.
Comparisons with existing fire models were also made in the paper, namely, comparisons with CFAST and CONTAM.
The mathematical basis for the COSMO model is formulated on differential equations rather than the algebraic equations that are employed in frequently used programs such as CONTAM.
In order for COSMO to behave like CONTAM, friction was removed from the flow of gases in the shaft and heat transfer between the gases in the shaft was ignored.
Ambient data were then used to drive a CONTAM simulation model of the same space.
These training data were created using a multizone program, CONTAM (Walton and Dols 2003).
In order to predict contaminant distribution, CONTAM includes models for infiltration, exfiltration, room-to-room airflows and pressure difference in building airflows driven by mechanical means, wind pressures acting on the exterior of the building, and buoyancy effects induced by temperature differences between the building zones or between interior and exterior conditions.