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This paper compares the practice of dilution ventilation (DILVENT), which ideally requires perfect mixing, with displacement ventilation (DISPVENT), which involves fresh air displacing contaminated air without mixing. Keeping DILVENT as a reference the approach of intervention was used to estimate the potential of DISPVENT for improving environmental conditions in a garment sewing plant. Air exchange efficiency of DILVENT came to 49%. DISPVENT improved the efficiency lo a level of 57%. At workstation level DISPVENT improved air renewal by a factor of 1 .3.

This paper describes the application of a two-dimensional finite element computer program for predicting the temperatures and heat flux in the floor-slab and ground of industrial buildings. The model was constructed from the SERC's Finite Element Library. The model has been used to predict the steady state heat flux for different ground conditions and floor-slab insulation options, and results are presented.