Abstract
On the steady state flow field. transient concentration responses can be calculated through computation of convolution by using response factors for the pulses of a finite duration. since convective diffusion equation of concentration is linear. Although it is difficult to obtain analytical solution of concentration response for an input pulse of a concentration source on the steady state flow field. numerical responses at any cell can be obtained easily by applying CFD analysis through dividing the flow field into proper cells. In this paper. the calculation method of transient concentration response on the steady state flow field is formulated with reference to the response factor method of air-conditioning load calculation. A computational code is developed on a personal computer based on the present method and simulations for the indoor pollutant accidents are done having some countermeasures for terrorism. The calculation method and simulation results are presented as well as the quantitative effects of all fresh air operation during the accident.
