NIST Time|NIST Home|About NIST|Contact NIST

HomeAll Years:AuthorKeywordTitle2005-2010:AuthorKeywordTitle

LoopDA: Natural Ventilation Design and Analysis Software.

pdf icon LoopDA: Natural Ventilation Design and Analysis Software. (715 K)
Dols, W. S.; Emmerich, S. J.

NISTIR 6967; 36 p. April 2003.


Department of Energy, Washington, DC

Available from:

Orders Only) 800-553-6847;
Order number: PB2003-104235


ventilation; computer programs; airflow analysis; design tool; indoor air quality; multizone analysis; natural ventilation


The Loop Equation Design Method has been proposed for sizing ventilation airflow components of natural and hybrid ventilation systems. While the approach has been demonstrated on a limited basis, the method has been automated in order to better evaluate its reliability under a more controlled, i.e., less error-prone, environment. This report describes a computer program developed by NIST that implements the Loop Equation Design Method for sizing the openings of naturally ventilated buildings. The tool, referred to as LoopDA for Loop Design and Analysis, is integrated with an existing multi-zone analysis tool CONTAMW. LoopDA provides the designer of natural ventilation systems with an environment in which to perform and document the process of designing the opening sizes of natural ventilation systems and analyzing the system behavior under a variety of operating conditions. This report describes the first version of the LoopDA program, provides an example of its application to the design of a naturally ventilated building and describes needs for future enhancements to the tool to increase its usefulness within the design community.