Numerical expressions for ventilation parameters.

The computer-aided ventilation system design requires the programming of a large number of empirical tables and observations on the use of mathematical expressions which describe numerous ventilation parameters. In order to use computers with efficiency and to reduce programming inessentials, a set of numerical approximations are developed. These expressions are divided intotwo categories: 1) external variables and 2) system variables. The external variables are basically the duct resistance calcultions. Programming details are also discussed and methods to unite a program which allow the flow of logic from one branch to another with minimal repetition of calculations.